| /* |
| * linux/drivers/ide/ide-tape.c Version 1.17a Jan, 2001 |
| * |
| * Copyright (C) 1995 - 1999 Gadi Oxman <gadio@netvision.net.il> |
| * |
| * $Header$ |
| * |
| * This driver was constructed as a student project in the software laboratory |
| * of the faculty of electrical engineering in the Technion - Israel's |
| * Institute Of Technology, with the guide of Avner Lottem and Dr. Ilana David. |
| * |
| * It is hereby placed under the terms of the GNU general public license. |
| * (See linux/COPYING). |
| */ |
| |
| /* |
| * IDE ATAPI streaming tape driver. |
| * |
| * This driver is a part of the Linux ide driver and works in co-operation |
| * with linux/drivers/block/ide.c. |
| * |
| * The driver, in co-operation with ide.c, basically traverses the |
| * request-list for the block device interface. The character device |
| * interface, on the other hand, creates new requests, adds them |
| * to the request-list of the block device, and waits for their completion. |
| * |
| * Pipelined operation mode is now supported on both reads and writes. |
| * |
| * The block device major and minor numbers are determined from the |
| * tape's relative position in the ide interfaces, as explained in ide.c. |
| * |
| * The character device interface consists of the following devices: |
| * |
| * ht0 major 37, minor 0 first IDE tape, rewind on close. |
| * ht1 major 37, minor 1 second IDE tape, rewind on close. |
| * ... |
| * nht0 major 37, minor 128 first IDE tape, no rewind on close. |
| * nht1 major 37, minor 129 second IDE tape, no rewind on close. |
| * ... |
| * |
| * Run linux/scripts/MAKEDEV.ide to create the above entries. |
| * |
| * The general magnetic tape commands compatible interface, as defined by |
| * include/linux/mtio.h, is accessible through the character device. |
| * |
| * General ide driver configuration options, such as the interrupt-unmask |
| * flag, can be configured by issuing an ioctl to the block device interface, |
| * as any other ide device. |
| * |
| * Our own ide-tape ioctl's can be issued to either the block device or |
| * the character device interface. |
| * |
| * Maximal throughput with minimal bus load will usually be achieved in the |
| * following scenario: |
| * |
| * 1. ide-tape is operating in the pipelined operation mode. |
| * 2. No buffering is performed by the user backup program. |
| * |
| * Testing was done with a 2 GB CONNER CTMA 4000 IDE ATAPI Streaming Tape Drive. |
| * |
| * Ver 0.1 Nov 1 95 Pre-working code :-) |
| * Ver 0.2 Nov 23 95 A short backup (few megabytes) and restore procedure |
| * was successful ! (Using tar cvf ... on the block |
| * device interface). |
| * A longer backup resulted in major swapping, bad |
| * overall Linux performance and eventually failed as |
| * we received non serial read-ahead requests from the |
| * buffer cache. |
| * Ver 0.3 Nov 28 95 Long backups are now possible, thanks to the |
| * character device interface. Linux's responsiveness |
| * and performance doesn't seem to be much affected |
| * from the background backup procedure. |
| * Some general mtio.h magnetic tape operations are |
| * now supported by our character device. As a result, |
| * popular tape utilities are starting to work with |
| * ide tapes :-) |
| * The following configurations were tested: |
| * 1. An IDE ATAPI TAPE shares the same interface |
| * and irq with an IDE ATAPI CDROM. |
| * 2. An IDE ATAPI TAPE shares the same interface |
| * and irq with a normal IDE disk. |
| * Both configurations seemed to work just fine ! |
| * However, to be on the safe side, it is meanwhile |
| * recommended to give the IDE TAPE its own interface |
| * and irq. |
| * The one thing which needs to be done here is to |
| * add a "request postpone" feature to ide.c, |
| * so that we won't have to wait for the tape to finish |
| * performing a long media access (DSC) request (such |
| * as a rewind) before we can access the other device |
| * on the same interface. This effect doesn't disturb |
| * normal operation most of the time because read/write |
| * requests are relatively fast, and once we are |
| * performing one tape r/w request, a lot of requests |
| * from the other device can be queued and ide.c will |
| * service all of them after this single tape request. |
| * Ver 1.0 Dec 11 95 Integrated into Linux 1.3.46 development tree. |
| * On each read / write request, we now ask the drive |
| * if we can transfer a constant number of bytes |
| * (a parameter of the drive) only to its buffers, |
| * without causing actual media access. If we can't, |
| * we just wait until we can by polling the DSC bit. |
| * This ensures that while we are not transferring |
| * more bytes than the constant referred to above, the |
| * interrupt latency will not become too high and |
| * we won't cause an interrupt timeout, as happened |
| * occasionally in the previous version. |
| * While polling for DSC, the current request is |
| * postponed and ide.c is free to handle requests from |
| * the other device. This is handled transparently to |
| * ide.c. The hwgroup locking method which was used |
| * in the previous version was removed. |
| * Use of new general features which are provided by |
| * ide.c for use with atapi devices. |
| * (Programming done by Mark Lord) |
| * Few potential bug fixes (Again, suggested by Mark) |
| * Single character device data transfers are now |
| * not limited in size, as they were before. |
| * We are asking the tape about its recommended |
| * transfer unit and send a larger data transfer |
| * as several transfers of the above size. |
| * For best results, use an integral number of this |
| * basic unit (which is shown during driver |
| * initialization). I will soon add an ioctl to get |
| * this important parameter. |
| * Our data transfer buffer is allocated on startup, |
| * rather than before each data transfer. This should |
| * ensure that we will indeed have a data buffer. |
| * Ver 1.1 Dec 14 95 Fixed random problems which occurred when the tape |
| * shared an interface with another device. |
| * (poll_for_dsc was a complete mess). |
| * Removed some old (non-active) code which had |
| * to do with supporting buffer cache originated |
| * requests. |
| * The block device interface can now be opened, so |
| * that general ide driver features like the unmask |
| * interrupts flag can be selected with an ioctl. |
| * This is the only use of the block device interface. |
| * New fast pipelined operation mode (currently only on |
| * writes). When using the pipelined mode, the |
| * throughput can potentially reach the maximum |
| * tape supported throughput, regardless of the |
| * user backup program. On my tape drive, it sometimes |
| * boosted performance by a factor of 2. Pipelined |
| * mode is enabled by default, but since it has a few |
| * downfalls as well, you may want to disable it. |
| * A short explanation of the pipelined operation mode |
| * is available below. |
| * Ver 1.2 Jan 1 96 Eliminated pipelined mode race condition. |
| * Added pipeline read mode. As a result, restores |
| * are now as fast as backups. |
| * Optimized shared interface behavior. The new behavior |
| * typically results in better IDE bus efficiency and |
| * higher tape throughput. |
| * Pre-calculation of the expected read/write request |
| * service time, based on the tape's parameters. In |
| * the pipelined operation mode, this allows us to |
| * adjust our polling frequency to a much lower value, |
| * and thus to dramatically reduce our load on Linux, |
| * without any decrease in performance. |
| * Implemented additional mtio.h operations. |
| * The recommended user block size is returned by |
| * the MTIOCGET ioctl. |
| * Additional minor changes. |
| * Ver 1.3 Feb 9 96 Fixed pipelined read mode bug which prevented the |
| * use of some block sizes during a restore procedure. |
| * The character device interface will now present a |
| * continuous view of the media - any mix of block sizes |
| * during a backup/restore procedure is supported. The |
| * driver will buffer the requests internally and |
| * convert them to the tape's recommended transfer |
| * unit, making performance almost independent of the |
| * chosen user block size. |
| * Some improvements in error recovery. |
| * By cooperating with ide-dma.c, bus mastering DMA can |
| * now sometimes be used with IDE tape drives as well. |
| * Bus mastering DMA has the potential to dramatically |
| * reduce the CPU's overhead when accessing the device, |
| * and can be enabled by using hdparm -d1 on the tape's |
| * block device interface. For more info, read the |
| * comments in ide-dma.c. |
| * Ver 1.4 Mar 13 96 Fixed serialize support. |
| * Ver 1.5 Apr 12 96 Fixed shared interface operation, broken in 1.3.85. |
| * Fixed pipelined read mode inefficiency. |
| * Fixed nasty null dereferencing bug. |
| * Ver 1.6 Aug 16 96 Fixed FPU usage in the driver. |
| * Fixed end of media bug. |
| * Ver 1.7 Sep 10 96 Minor changes for the CONNER CTT8000-A model. |
| * Ver 1.8 Sep 26 96 Attempt to find a better balance between good |
| * interactive response and high system throughput. |
| * Ver 1.9 Nov 5 96 Automatically cross encountered filemarks rather |
| * than requiring an explicit FSF command. |
| * Abort pending requests at end of media. |
| * MTTELL was sometimes returning incorrect results. |
| * Return the real block size in the MTIOCGET ioctl. |
| * Some error recovery bug fixes. |
| * Ver 1.10 Nov 5 96 Major reorganization. |
| * Reduced CPU overhead a bit by eliminating internal |
| * bounce buffers. |
| * Added module support. |
| * Added multiple tape drives support. |
| * Added partition support. |
| * Rewrote DSC handling. |
| * Some portability fixes. |
| * Removed ide-tape.h. |
| * Additional minor changes. |
| * Ver 1.11 Dec 2 96 Bug fix in previous DSC timeout handling. |
| * Use ide_stall_queue() for DSC overlap. |
| * Use the maximum speed rather than the current speed |
| * to compute the request service time. |
| * Ver 1.12 Dec 7 97 Fix random memory overwriting and/or last block data |
| * corruption, which could occur if the total number |
| * of bytes written to the tape was not an integral |
| * number of tape blocks. |
| * Add support for INTERRUPT DRQ devices. |
| * Ver 1.13 Jan 2 98 Add "speed == 0" work-around for HP COLORADO 5GB |
| * Ver 1.14 Dec 30 98 Partial fixes for the Sony/AIWA tape drives. |
| * Replace cli()/sti() with hwgroup spinlocks. |
| * Ver 1.15 Mar 25 99 Fix SMP race condition by replacing hwgroup |
| * spinlock with private per-tape spinlock. |
| * Ver 1.16 Sep 1 99 Add OnStream tape support. |
| * Abort read pipeline on EOD. |
| * Wait for the tape to become ready in case it returns |
| * "in the process of becoming ready" on open(). |
| * Fix zero padding of the last written block in |
| * case the tape block size is larger than PAGE_SIZE. |
| * Decrease the default disconnection time to tn. |
| * Ver 1.16e Oct 3 99 Minor fixes. |
| * Ver 1.16e1 Oct 13 99 Patches by Arnold Niessen, |
| * niessen@iae.nl / arnold.niessen@philips.com |
| * GO-1) Undefined code in idetape_read_position |
| * according to Gadi's email |
| * AJN-1) Minor fix asc == 11 should be asc == 0x11 |
| * in idetape_issue_packet_command (did effect |
| * debugging output only) |
| * AJN-2) Added more debugging output, and |
| * added ide-tape: where missing. I would also |
| * like to add tape->name where possible |
| * AJN-3) Added different debug_level's |
| * via /proc/ide/hdc/settings |
| * "debug_level" determines amount of debugging output; |
| * can be changed using /proc/ide/hdx/settings |
| * 0 : almost no debugging output |
| * 1 : 0+output errors only |
| * 2 : 1+output all sensekey/asc |
| * 3 : 2+follow all chrdev related procedures |
| * 4 : 3+follow all procedures |
| * 5 : 4+include pc_stack rq_stack info |
| * 6 : 5+USE_COUNT updates |
| * AJN-4) Fixed timeout for retension in idetape_queue_pc_tail |
| * from 5 to 10 minutes |
| * AJN-5) Changed maximum number of blocks to skip when |
| * reading tapes with multiple consecutive write |
| * errors from 100 to 1000 in idetape_get_logical_blk |
| * Proposed changes to code: |
| * 1) output "logical_blk_num" via /proc |
| * 2) output "current_operation" via /proc |
| * 3) Either solve or document the fact that `mt rewind' is |
| * required after reading from /dev/nhtx to be |
| * able to rmmod the idetape module; |
| * Also, sometimes an application finishes but the |
| * device remains `busy' for some time. Same cause ? |
| * Proposed changes to release-notes: |
| * 4) write a simple `quickstart' section in the |
| * release notes; I volunteer if you don't want to |
| * 5) include a pointer to video4linux in the doc |
| * to stimulate video applications |
| * 6) release notes lines 331 and 362: explain what happens |
| * if the application data rate is higher than 1100 KB/s; |
| * similar approach to lower-than-500 kB/s ? |
| * 7) 6.6 Comparison; wouldn't it be better to allow different |
| * strategies for read and write ? |
| * Wouldn't it be better to control the tape buffer |
| * contents instead of the bandwidth ? |
| * 8) line 536: replace will by would (if I understand |
| * this section correctly, a hypothetical and unwanted situation |
| * is being described) |
| * Ver 1.16f Dec 15 99 Change place of the secondary OnStream header frames. |
| * Ver 1.17 Nov 2000 / Jan 2001 Marcel Mol, marcel@mesa.nl |
| * - Add idetape_onstream_mode_sense_tape_parameter_page |
| * function to get tape capacity in frames: tape->capacity. |
| * - Add support for DI-50 drives( or any DI- drive). |
| * - 'workaround' for read error/blank block arround block 3000. |
| * - Implement Early warning for end of media for Onstream. |
| * - Cosmetic code changes for readability. |
| * - Idetape_position_tape should not use SKIP bit during |
| * Onstream read recovery. |
| * - Add capacity, logical_blk_num and first/last_frame_position |
| * to /proc/ide/hd?/settings. |
| * - Module use count was gone in the Linux 2.4 driver. |
| * Ver 1.17a Apr 2001 Willem Riede osst@riede.org |
| * - Get drive's actual block size from mode sense block descriptor |
| * - Limit size of pipeline |
| * |
| * Here are some words from the first releases of hd.c, which are quoted |
| * in ide.c and apply here as well: |
| * |
| * | Special care is recommended. Have Fun! |
| * |
| */ |
| |
| /* |
| * An overview of the pipelined operation mode. |
| * |
| * In the pipelined write mode, we will usually just add requests to our |
| * pipeline and return immediately, before we even start to service them. The |
| * user program will then have enough time to prepare the next request while |
| * we are still busy servicing previous requests. In the pipelined read mode, |
| * the situation is similar - we add read-ahead requests into the pipeline, |
| * before the user even requested them. |
| * |
| * The pipeline can be viewed as a "safety net" which will be activated when |
| * the system load is high and prevents the user backup program from keeping up |
| * with the current tape speed. At this point, the pipeline will get |
| * shorter and shorter but the tape will still be streaming at the same speed. |
| * Assuming we have enough pipeline stages, the system load will hopefully |
| * decrease before the pipeline is completely empty, and the backup program |
| * will be able to "catch up" and refill the pipeline again. |
| * |
| * When using the pipelined mode, it would be best to disable any type of |
| * buffering done by the user program, as ide-tape already provides all the |
| * benefits in the kernel, where it can be done in a more efficient way. |
| * As we will usually not block the user program on a request, the most |
| * efficient user code will then be a simple read-write-read-... cycle. |
| * Any additional logic will usually just slow down the backup process. |
| * |
| * Using the pipelined mode, I get a constant over 400 KBps throughput, |
| * which seems to be the maximum throughput supported by my tape. |
| * |
| * However, there are some downfalls: |
| * |
| * 1. We use memory (for data buffers) in proportional to the number |
| * of pipeline stages (each stage is about 26 KB with my tape). |
| * 2. In the pipelined write mode, we cheat and postpone error codes |
| * to the user task. In read mode, the actual tape position |
| * will be a bit further than the last requested block. |
| * |
| * Concerning (1): |
| * |
| * 1. We allocate stages dynamically only when we need them. When |
| * we don't need them, we don't consume additional memory. In |
| * case we can't allocate stages, we just manage without them |
| * (at the expense of decreased throughput) so when Linux is |
| * tight in memory, we will not pose additional difficulties. |
| * |
| * 2. The maximum number of stages (which is, in fact, the maximum |
| * amount of memory) which we allocate is limited by the compile |
| * time parameter IDETAPE_MAX_PIPELINE_STAGES. |
| * |
| * 3. The maximum number of stages is a controlled parameter - We |
| * don't start from the user defined maximum number of stages |
| * but from the lower IDETAPE_MIN_PIPELINE_STAGES (again, we |
| * will not even allocate this amount of stages if the user |
| * program can't handle the speed). We then implement a feedback |
| * loop which checks if the pipeline is empty, and if it is, we |
| * increase the maximum number of stages as necessary until we |
| * reach the optimum value which just manages to keep the tape |
| * busy with minimum allocated memory or until we reach |
| * IDETAPE_MAX_PIPELINE_STAGES. |
| * |
| * Concerning (2): |
| * |
| * In pipelined write mode, ide-tape can not return accurate error codes |
| * to the user program since we usually just add the request to the |
| * pipeline without waiting for it to be serviced. In case an error |
| * occurs, I will report it on the next user request. |
| * |
| * In the pipelined read mode, subsequent read requests or forward |
| * filemark spacing will perform correctly, as we preserve all blocks |
| * and filemarks which we encountered during our excess read-ahead. |
| * |
| * For accurate tape positioning and error reporting, disabling |
| * pipelined mode might be the best option. |
| * |
| * You can enable/disable/tune the pipelined operation mode by adjusting |
| * the compile time parameters below. |
| */ |
| |
| /* |
| * Possible improvements. |
| * |
| * 1. Support for the ATAPI overlap protocol. |
| * |
| * In order to maximize bus throughput, we currently use the DSC |
| * overlap method which enables ide.c to service requests from the |
| * other device while the tape is busy executing a command. The |
| * DSC overlap method involves polling the tape's status register |
| * for the DSC bit, and servicing the other device while the tape |
| * isn't ready. |
| * |
| * In the current QIC development standard (December 1995), |
| * it is recommended that new tape drives will *in addition* |
| * implement the ATAPI overlap protocol, which is used for the |
| * same purpose - efficient use of the IDE bus, but is interrupt |
| * driven and thus has much less CPU overhead. |
| * |
| * ATAPI overlap is likely to be supported in most new ATAPI |
| * devices, including new ATAPI cdroms, and thus provides us |
| * a method by which we can achieve higher throughput when |
| * sharing a (fast) ATA-2 disk with any (slow) new ATAPI device. |
| */ |
| |
| #define IDETAPE_VERSION "1.17a" |
| |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/timer.h> |
| #include <linux/mm.h> |
| #include <linux/interrupt.h> |
| #include <linux/major.h> |
| #include <linux/devfs_fs_kernel.h> |
| #include <linux/errno.h> |
| #include <linux/genhd.h> |
| #include <linux/slab.h> |
| #include <linux/pci.h> |
| #include <linux/ide.h> |
| #include <linux/smp_lock.h> |
| #include <linux/completion.h> |
| |
| #include <asm/byteorder.h> |
| #include <asm/irq.h> |
| #include <asm/uaccess.h> |
| #include <asm/io.h> |
| #include <asm/unaligned.h> |
| #include <asm/bitops.h> |
| |
| |
| #define NO_LONGER_REQUIRED (1) |
| |
| /* |
| * OnStream support |
| */ |
| #define ONSTREAM_DEBUG (0) |
| #define OS_CONFIG_PARTITION (0xff) |
| #define OS_DATA_PARTITION (0) |
| #define OS_PARTITION_VERSION (1) |
| #define OS_EW 300 |
| #define OS_ADR_MINREV 2 |
| |
| #define OS_DATA_STARTFRAME1 20 |
| #define OS_DATA_ENDFRAME1 2980 |
| /* |
| * partition |
| */ |
| typedef struct os_partition_s { |
| __u8 partition_num; |
| __u8 par_desc_ver; |
| __u16 wrt_pass_cntr; |
| __u32 first_frame_addr; |
| __u32 last_frame_addr; |
| __u32 eod_frame_addr; |
| } os_partition_t; |
| |
| /* |
| * DAT entry |
| */ |
| typedef struct os_dat_entry_s { |
| __u32 blk_sz; |
| __u16 blk_cnt; |
| __u8 flags; |
| __u8 reserved; |
| } os_dat_entry_t; |
| |
| /* |
| * DAT |
| */ |
| #define OS_DAT_FLAGS_DATA (0xc) |
| #define OS_DAT_FLAGS_MARK (0x1) |
| |
| typedef struct os_dat_s { |
| __u8 dat_sz; |
| __u8 reserved1; |
| __u8 entry_cnt; |
| __u8 reserved3; |
| os_dat_entry_t dat_list[16]; |
| } os_dat_t; |
| |
| /* |
| * Frame types |
| */ |
| #define OS_FRAME_TYPE_FILL (0) |
| #define OS_FRAME_TYPE_EOD (1 << 0) |
| #define OS_FRAME_TYPE_MARKER (1 << 1) |
| #define OS_FRAME_TYPE_HEADER (1 << 3) |
| #define OS_FRAME_TYPE_DATA (1 << 7) |
| |
| /* |
| * AUX |
| */ |
| typedef struct os_aux_s { |
| __u32 format_id; /* hardware compability AUX is based on */ |
| char application_sig[4]; /* driver used to write this media */ |
| __u32 hdwr; /* reserved */ |
| __u32 update_frame_cntr; /* for configuration frame */ |
| __u8 frame_type; |
| __u8 frame_type_reserved; |
| __u8 reserved_18_19[2]; |
| os_partition_t partition; |
| __u8 reserved_36_43[8]; |
| __u32 frame_seq_num; |
| __u32 logical_blk_num_high; |
| __u32 logical_blk_num; |
| os_dat_t dat; |
| __u8 reserved188_191[4]; |
| __u32 filemark_cnt; |
| __u32 phys_fm; |
| __u32 last_mark_addr; |
| __u8 reserved204_223[20]; |
| |
| /* |
| * __u8 app_specific[32]; |
| * |
| * Linux specific fields: |
| */ |
| __u32 next_mark_addr; /* when known, points to next marker */ |
| __u8 linux_specific[28]; |
| |
| __u8 reserved_256_511[256]; |
| } os_aux_t; |
| |
| typedef struct os_header_s { |
| char ident_str[8]; |
| __u8 major_rev; |
| __u8 minor_rev; |
| __u8 reserved10_15[6]; |
| __u8 par_num; |
| __u8 reserved1_3[3]; |
| os_partition_t partition; |
| } os_header_t; |
| |
| /* |
| * OnStream Tape Parameters Page |
| */ |
| typedef struct { |
| unsigned page_code :6; /* Page code - Should be 0x2b */ |
| unsigned reserved1_6 :1; |
| unsigned ps :1; |
| __u8 reserved2; |
| __u8 density; /* kbpi */ |
| __u8 reserved3,reserved4; |
| __u16 segtrk; /* segment of per track */ |
| __u16 trks; /* tracks per tape */ |
| __u8 reserved5,reserved6,reserved7,reserved8,reserved9,reserved10; |
| } onstream_tape_paramtr_page_t; |
| |
| /* |
| * OnStream ADRL frame |
| */ |
| #define OS_FRAME_SIZE (32 * 1024 + 512) |
| #define OS_DATA_SIZE (32 * 1024) |
| #define OS_AUX_SIZE (512) |
| |
| /* |
| * internal error codes for onstream |
| */ |
| #define OS_PART_ERROR 2 |
| #define OS_WRITE_ERROR 1 |
| |
| #include <linux/mtio.h> |
| |
| /**************************** Tunable parameters *****************************/ |
| |
| |
| /* |
| * Pipelined mode parameters. |
| * |
| * We try to use the minimum number of stages which is enough to |
| * keep the tape constantly streaming. To accomplish that, we implement |
| * a feedback loop around the maximum number of stages: |
| * |
| * We start from MIN maximum stages (we will not even use MIN stages |
| * if we don't need them), increment it by RATE*(MAX-MIN) |
| * whenever we sense that the pipeline is empty, until we reach |
| * the optimum value or until we reach MAX. |
| * |
| * Setting the following parameter to 0 will disable the pipelined mode. |
| */ |
| #define IDETAPE_MIN_PIPELINE_STAGES 200 |
| #define IDETAPE_MAX_PIPELINE_STAGES 400 |
| #define IDETAPE_INCREASE_STAGES_RATE 20 |
| |
| /* |
| * The following are used to debug the driver: |
| * |
| * Setting IDETAPE_DEBUG_INFO to 1 will report device capabilities. |
| * Setting IDETAPE_DEBUG_LOG to 1 will log driver flow control. |
| * Setting IDETAPE_DEBUG_BUGS to 1 will enable self-sanity checks in |
| * some places. |
| * |
| * Setting them to 0 will restore normal operation mode: |
| * |
| * 1. Disable logging normal successful operations. |
| * 2. Disable self-sanity checks. |
| * 3. Errors will still be logged, of course. |
| * |
| * All the #if DEBUG code will be removed some day, when the driver |
| * is verified to be stable enough. This will make it much more |
| * esthetic. |
| */ |
| #define IDETAPE_DEBUG_INFO 1 |
| #define IDETAPE_DEBUG_LOG 1 |
| #define IDETAPE_DEBUG_LOG_VERBOSE 0 |
| #define IDETAPE_DEBUG_BUGS 1 |
| |
| /* |
| * After each failed packet command we issue a request sense command |
| * and retry the packet command IDETAPE_MAX_PC_RETRIES times. |
| * |
| * Setting IDETAPE_MAX_PC_RETRIES to 0 will disable retries. |
| */ |
| #define IDETAPE_MAX_PC_RETRIES 3 |
| |
| /* |
| * With each packet command, we allocate a buffer of |
| * IDETAPE_PC_BUFFER_SIZE bytes. This is used for several packet |
| * commands (Not for READ/WRITE commands). |
| */ |
| #define IDETAPE_PC_BUFFER_SIZE 256 |
| |
| /* |
| * In various places in the driver, we need to allocate storage |
| * for packet commands and requests, which will remain valid while |
| * we leave the driver to wait for an interrupt or a timeout event. |
| */ |
| #define IDETAPE_PC_STACK (10 + IDETAPE_MAX_PC_RETRIES) |
| |
| /* |
| * Some tape drives require a long irq timeout |
| */ |
| #define IDETAPE_WAIT_CMD (60*HZ) |
| |
| /* |
| * The following parameter is used to select the point in the internal |
| * tape fifo in which we will start to refill the buffer. Decreasing |
| * the following parameter will improve the system's latency and |
| * interactive response, while using a high value might improve sytem |
| * throughput. |
| */ |
| #define IDETAPE_FIFO_THRESHOLD 2 |
| |
| /* |
| * DSC polling parameters. |
| * |
| * Polling for DSC (a single bit in the status register) is a very |
| * important function in ide-tape. There are two cases in which we |
| * poll for DSC: |
| * |
| * 1. Before a read/write packet command, to ensure that we |
| * can transfer data from/to the tape's data buffers, without |
| * causing an actual media access. In case the tape is not |
| * ready yet, we take out our request from the device |
| * request queue, so that ide.c will service requests from |
| * the other device on the same interface meanwhile. |
| * |
| * 2. After the successful initialization of a "media access |
| * packet command", which is a command which can take a long |
| * time to complete (it can be several seconds or even an hour). |
| * |
| * Again, we postpone our request in the middle to free the bus |
| * for the other device. The polling frequency here should be |
| * lower than the read/write frequency since those media access |
| * commands are slow. We start from a "fast" frequency - |
| * IDETAPE_DSC_MA_FAST (one second), and if we don't receive DSC |
| * after IDETAPE_DSC_MA_THRESHOLD (5 minutes), we switch it to a |
| * lower frequency - IDETAPE_DSC_MA_SLOW (1 minute). |
| * |
| * We also set a timeout for the timer, in case something goes wrong. |
| * The timeout should be longer then the maximum execution time of a |
| * tape operation. |
| */ |
| |
| /* |
| * DSC timings. |
| */ |
| #define IDETAPE_DSC_RW_MIN 5*HZ/100 /* 50 msec */ |
| #define IDETAPE_DSC_RW_MAX 40*HZ/100 /* 400 msec */ |
| #define IDETAPE_DSC_RW_TIMEOUT 2*60*HZ /* 2 minutes */ |
| #define IDETAPE_DSC_MA_FAST 2*HZ /* 2 seconds */ |
| #define IDETAPE_DSC_MA_THRESHOLD 5*60*HZ /* 5 minutes */ |
| #define IDETAPE_DSC_MA_SLOW 30*HZ /* 30 seconds */ |
| #define IDETAPE_DSC_MA_TIMEOUT 2*60*60*HZ /* 2 hours */ |
| |
| /*************************** End of tunable parameters ***********************/ |
| |
| /* |
| * Debugging/Performance analysis |
| * |
| * I/O trace support |
| */ |
| #define USE_IOTRACE 0 |
| #if USE_IOTRACE |
| #include <linux/io_trace.h> |
| #define IO_IDETAPE_FIFO 500 |
| #endif |
| |
| /* |
| * Read/Write error simulation |
| */ |
| #define SIMULATE_ERRORS 0 |
| |
| /* |
| * For general magnetic tape device compatibility. |
| */ |
| typedef enum { |
| idetape_direction_none, |
| idetape_direction_read, |
| idetape_direction_write |
| } idetape_chrdev_direction_t; |
| |
| /* |
| * Our view of a packet command. |
| */ |
| typedef struct idetape_packet_command_s { |
| u8 c[12]; /* Actual packet bytes */ |
| int retries; /* On each retry, we increment retries */ |
| int error; /* Error code */ |
| int request_transfer; /* Bytes to transfer */ |
| int actually_transferred; /* Bytes actually transferred */ |
| int buffer_size; /* Size of our data buffer */ |
| struct bio *bio; |
| char *b_data; |
| int b_count; |
| byte *buffer; /* Data buffer */ |
| byte *current_position; /* Pointer into the above buffer */ |
| ide_startstop_t (*callback) (ide_drive_t *); /* Called when this packet command is completed */ |
| byte pc_buffer[IDETAPE_PC_BUFFER_SIZE]; /* Temporary buffer */ |
| unsigned long flags; /* Status/Action bit flags: long for set_bit */ |
| } idetape_pc_t; |
| |
| /* |
| * Packet command flag bits. |
| */ |
| #define PC_ABORT 0 /* Set when an error is considered normal - We won't retry */ |
| #define PC_WAIT_FOR_DSC 1 /* 1 When polling for DSC on a media access command */ |
| #define PC_DMA_RECOMMENDED 2 /* 1 when we prefer to use DMA if possible */ |
| #define PC_DMA_IN_PROGRESS 3 /* 1 while DMA in progress */ |
| #define PC_DMA_ERROR 4 /* 1 when encountered problem during DMA */ |
| #define PC_WRITING 5 /* Data direction */ |
| |
| /* |
| * Capabilities and Mechanical Status Page |
| */ |
| typedef struct { |
| unsigned page_code :6; /* Page code - Should be 0x2a */ |
| __u8 reserved0_6 :1; |
| __u8 ps :1; /* parameters saveable */ |
| __u8 page_length; /* Page Length - Should be 0x12 */ |
| __u8 reserved2, reserved3; |
| unsigned ro :1; /* Read Only Mode */ |
| unsigned reserved4_1234 :4; |
| unsigned sprev :1; /* Supports SPACE in the reverse direction */ |
| unsigned reserved4_67 :2; |
| unsigned reserved5_012 :3; |
| unsigned efmt :1; /* Supports ERASE command initiated formatting */ |
| unsigned reserved5_4 :1; |
| unsigned qfa :1; /* Supports the QFA two partition formats */ |
| unsigned reserved5_67 :2; |
| unsigned lock :1; /* Supports locking the volume */ |
| unsigned locked :1; /* The volume is locked */ |
| unsigned prevent :1; /* The device defaults in the prevent state after power up */ |
| unsigned eject :1; /* The device can eject the volume */ |
| __u8 disconnect :1; /* The device can break request > ctl */ |
| __u8 reserved6_5 :1; |
| unsigned ecc :1; /* Supports error correction */ |
| unsigned cmprs :1; /* Supports data compression */ |
| unsigned reserved7_0 :1; |
| unsigned blk512 :1; /* Supports 512 bytes block size */ |
| unsigned blk1024 :1; /* Supports 1024 bytes block size */ |
| unsigned reserved7_3_6 :4; |
| unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */ |
| /* transfers for slow buffer memory ??? */ |
| /* Also 32768 block size in some cases */ |
| __u16 max_speed; /* Maximum speed supported in KBps */ |
| __u8 reserved10, reserved11; |
| __u16 ctl; /* Continuous Transfer Limit in blocks */ |
| __u16 speed; /* Current Speed, in KBps */ |
| __u16 buffer_size; /* Buffer Size, in 512 bytes */ |
| __u8 reserved18, reserved19; |
| } idetape_capabilities_page_t; |
| |
| /* |
| * Block Size Page |
| */ |
| typedef struct { |
| unsigned page_code :6; /* Page code - Should be 0x30 */ |
| unsigned reserved1_6 :1; |
| unsigned ps :1; |
| __u8 page_length; /* Page Length - Should be 2 */ |
| __u8 reserved2; |
| unsigned play32 :1; |
| unsigned play32_5 :1; |
| unsigned reserved2_23 :2; |
| unsigned record32 :1; |
| unsigned record32_5 :1; |
| unsigned reserved2_6 :1; |
| unsigned one :1; |
| } idetape_block_size_page_t; |
| |
| /* |
| * A pipeline stage. |
| */ |
| typedef struct idetape_stage_s { |
| struct request rq; /* The corresponding request */ |
| struct bio *bio; /* The data buffers */ |
| struct idetape_stage_s *next; /* Pointer to the next stage */ |
| os_aux_t *aux; /* OnStream aux ptr */ |
| } idetape_stage_t; |
| |
| /* |
| * REQUEST SENSE packet command result - Data Format. |
| */ |
| typedef struct { |
| unsigned error_code :7; /* Current of deferred errors */ |
| unsigned valid :1; /* The information field conforms to QIC-157C */ |
| __u8 reserved1 :8; /* Segment Number - Reserved */ |
| unsigned sense_key :4; /* Sense Key */ |
| unsigned reserved2_4 :1; /* Reserved */ |
| unsigned ili :1; /* Incorrect Length Indicator */ |
| unsigned eom :1; /* End Of Medium */ |
| unsigned filemark :1; /* Filemark */ |
| __u32 information __attribute__ ((packed)); |
| __u8 asl; /* Additional sense length (n-7) */ |
| __u32 command_specific; /* Additional command specific information */ |
| __u8 asc; /* Additional Sense Code */ |
| __u8 ascq; /* Additional Sense Code Qualifier */ |
| __u8 replaceable_unit_code; /* Field Replaceable Unit Code */ |
| unsigned sk_specific1 :7; /* Sense Key Specific */ |
| unsigned sksv :1; /* Sense Key Specific information is valid */ |
| __u8 sk_specific2; /* Sense Key Specific */ |
| __u8 sk_specific3; /* Sense Key Specific */ |
| __u8 pad[2]; /* Padding to 20 bytes */ |
| } idetape_request_sense_result_t; |
| |
| |
| /* |
| * Most of our global data which we need to save even as we leave the |
| * driver due to an interrupt or a timer event is stored in a variable |
| * of type idetape_tape_t, defined below. |
| */ |
| typedef struct { |
| ide_drive_t *drive; |
| devfs_handle_t de_r, de_n; |
| |
| /* |
| * Since a typical character device operation requires more |
| * than one packet command, we provide here enough memory |
| * for the maximum of interconnected packet commands. |
| * The packet commands are stored in the circular array pc_stack. |
| * pc_stack_index points to the last used entry, and warps around |
| * to the start when we get to the last array entry. |
| * |
| * pc points to the current processed packet command. |
| * |
| * failed_pc points to the last failed packet command, or contains |
| * NULL if we do not need to retry any packet command. This is |
| * required since an additional packet command is needed before the |
| * retry, to get detailed information on what went wrong. |
| */ |
| idetape_pc_t *pc; /* Current packet command */ |
| idetape_pc_t *failed_pc; /* Last failed packet command */ |
| idetape_pc_t pc_stack[IDETAPE_PC_STACK];/* Packet command stack */ |
| int pc_stack_index; /* Next free packet command storage space */ |
| struct request rq_stack[IDETAPE_PC_STACK]; |
| int rq_stack_index; /* We implement a circular array */ |
| |
| /* |
| * DSC polling variables. |
| * |
| * While polling for DSC we use postponed_rq to postpone the |
| * current request so that ide.c will be able to service |
| * pending requests on the other device. Note that at most |
| * we will have only one DSC (usually data transfer) request |
| * in the device request queue. Additional requests can be |
| * queued in our internal pipeline, but they will be visible |
| * to ide.c only one at a time. |
| */ |
| struct request *postponed_rq; |
| unsigned long dsc_polling_start; /* The time in which we started polling for DSC */ |
| struct timer_list dsc_timer; /* Timer used to poll for dsc */ |
| unsigned long best_dsc_rw_frequency; /* Read/Write dsc polling frequency */ |
| unsigned long dsc_polling_frequency; /* The current polling frequency */ |
| unsigned long dsc_timeout; /* Maximum waiting time */ |
| |
| /* |
| * Read position information |
| */ |
| byte partition; |
| unsigned int first_frame_position; /* Current block */ |
| unsigned int last_frame_position; |
| unsigned int blocks_in_buffer; |
| |
| /* |
| * Last error information |
| */ |
| byte sense_key, asc, ascq; |
| |
| /* |
| * Character device operation |
| */ |
| unsigned int minor; |
| char name[4]; /* device name */ |
| idetape_chrdev_direction_t chrdev_direction; /* Current character device data transfer direction */ |
| |
| /* |
| * Device information |
| */ |
| unsigned short tape_block_size; /* Usually 512 or 1024 bytes */ |
| int user_bs_factor; |
| idetape_capabilities_page_t capabilities; /* Copy of the tape's Capabilities and Mechanical Page */ |
| |
| /* |
| * Active data transfer request parameters. |
| * |
| * At most, there is only one ide-tape originated data transfer |
| * request in the device request queue. This allows ide.c to |
| * easily service requests from the other device when we |
| * postpone our active request. In the pipelined operation |
| * mode, we use our internal pipeline structure to hold |
| * more data requests. |
| * |
| * The data buffer size is chosen based on the tape's |
| * recommendation. |
| */ |
| struct request *active_data_request; /* Pointer to the request which is waiting in the device request queue */ |
| int stage_size; /* Data buffer size (chosen based on the tape's recommendation */ |
| idetape_stage_t *merge_stage; |
| int merge_stage_size; |
| struct bio *bio; |
| char *b_data; |
| int b_count; |
| |
| /* |
| * Pipeline parameters. |
| * |
| * To accomplish non-pipelined mode, we simply set the following |
| * variables to zero (or NULL, where appropriate). |
| */ |
| int nr_stages; /* Number of currently used stages */ |
| int nr_pending_stages; /* Number of pending stages */ |
| int max_stages, min_pipeline, max_pipeline; /* We will not allocate more than this number of stages */ |
| idetape_stage_t *first_stage; /* The first stage which will be removed from the pipeline */ |
| idetape_stage_t *active_stage; /* The currently active stage */ |
| idetape_stage_t *next_stage; /* Will be serviced after the currently active request */ |
| idetape_stage_t *last_stage; /* New requests will be added to the pipeline here */ |
| idetape_stage_t *cache_stage; /* Optional free stage which we can use */ |
| int pages_per_stage; |
| int excess_bh_size; /* Wasted space in each stage */ |
| |
| unsigned long flags; /* Status/Action flags: long for set_bit */ |
| spinlock_t spinlock; /* protects the ide-tape queue */ |
| |
| /* |
| * Measures average tape speed |
| */ |
| unsigned long avg_time; |
| int avg_size; |
| int avg_speed; |
| |
| idetape_request_sense_result_t sense; /* last sense information */ |
| |
| char vendor_id[10]; |
| char product_id[18]; |
| char firmware_revision[6]; |
| int firmware_revision_num; |
| |
| int door_locked; /* the door is currently locked */ |
| |
| /* |
| * OnStream flags |
| */ |
| int onstream; /* the tape is an OnStream tape */ |
| int raw; /* OnStream raw access (32.5KB block size) */ |
| int cur_frames; /* current number of frames in internal buffer */ |
| int max_frames; /* max number of frames in internal buffer */ |
| int logical_blk_num; /* logical block number */ |
| __u16 wrt_pass_cntr; /* write pass counter */ |
| __u32 update_frame_cntr; /* update frame counter */ |
| struct completion *waiting; |
| int onstream_write_error; /* write error recovery active */ |
| int header_ok; /* header frame verified ok */ |
| int linux_media; /* reading linux-specifc media */ |
| int linux_media_version; |
| char application_sig[5]; /* application signature */ |
| int filemark_cnt; |
| int first_mark_addr; |
| int last_mark_addr; |
| int eod_frame_addr; |
| unsigned long cmd_start_time; |
| unsigned long max_cmd_time; |
| unsigned capacity; |
| |
| /* |
| * Optimize the number of "buffer filling" |
| * mode sense commands. |
| */ |
| unsigned long last_buffer_fill; /* last time in which we issued fill cmd */ |
| int req_buffer_fill; /* buffer fill command requested */ |
| int writes_since_buffer_fill; |
| int reads_since_buffer_fill; |
| |
| /* |
| * Limit the number of times a request can |
| * be postponed, to avoid an infinite postpone |
| * deadlock. |
| */ |
| int postpone_cnt; /* request postpone count limit */ |
| |
| /* |
| * Measures number of frames: |
| * |
| * 1. written/read to/from the driver pipeline (pipeline_head). |
| * 2. written/read to/from the tape buffers (bio). |
| * 3. written/read by the tape to/from the media (tape_head). |
| */ |
| int pipeline_head; |
| int buffer_head; |
| int tape_head; |
| int last_tape_head; |
| |
| /* |
| * Speed control at the tape buffers input/output |
| */ |
| unsigned long insert_time; |
| int insert_size; |
| int insert_speed; |
| int max_insert_speed; |
| int measure_insert_time; |
| |
| /* |
| * Measure tape still time, in milliseconds |
| */ |
| unsigned long tape_still_time_begin; |
| int tape_still_time; |
| |
| /* |
| * Speed regulation negative feedback loop |
| */ |
| int speed_control; |
| int pipeline_head_speed, controlled_pipeline_head_speed, uncontrolled_pipeline_head_speed; |
| int controlled_last_pipeline_head, uncontrolled_last_pipeline_head; |
| unsigned long uncontrolled_pipeline_head_time, controlled_pipeline_head_time; |
| int controlled_previous_pipeline_head, uncontrolled_previous_pipeline_head; |
| unsigned long controlled_previous_head_time, uncontrolled_previous_head_time; |
| int restart_speed_control_req; |
| |
| /* |
| * Debug_level determines amount of debugging output; |
| * can be changed using /proc/ide/hdx/settings |
| * 0 : almost no debugging output |
| * 1 : 0+output errors only |
| * 2 : 1+output all sensekey/asc |
| * 3 : 2+follow all chrdev related procedures |
| * 4 : 3+follow all procedures |
| * 5 : 4+include pc_stack rq_stack info |
| * 6 : 5+USE_COUNT updates |
| */ |
| int debug_level; |
| } idetape_tape_t; |
| |
| /* |
| * Tape door status |
| */ |
| #define DOOR_UNLOCKED 0 |
| #define DOOR_LOCKED 1 |
| #define DOOR_EXPLICITLY_LOCKED 2 |
| |
| /* |
| * Tape flag bits values. |
| */ |
| #define IDETAPE_IGNORE_DSC 0 |
| #define IDETAPE_ADDRESS_VALID 1 /* 0 When the tape position is unknown */ |
| #define IDETAPE_BUSY 2 /* Device already opened */ |
| #define IDETAPE_PIPELINE_ERROR 3 /* Error detected in a pipeline stage */ |
| #define IDETAPE_DETECT_BS 4 /* Attempt to auto-detect the current user block size */ |
| #define IDETAPE_FILEMARK 5 /* Currently on a filemark */ |
| #define IDETAPE_DRQ_INTERRUPT 6 /* DRQ interrupt device */ |
| #define IDETAPE_READ_ERROR 7 |
| #define IDETAPE_PIPELINE_ACTIVE 8 /* pipeline active */ |
| |
| /* |
| * Supported ATAPI tape drives packet commands |
| */ |
| #define IDETAPE_TEST_UNIT_READY_CMD 0x00 |
| #define IDETAPE_REWIND_CMD 0x01 |
| #define IDETAPE_REQUEST_SENSE_CMD 0x03 |
| #define IDETAPE_READ_CMD 0x08 |
| #define IDETAPE_WRITE_CMD 0x0a |
| #define IDETAPE_WRITE_FILEMARK_CMD 0x10 |
| #define IDETAPE_SPACE_CMD 0x11 |
| #define IDETAPE_INQUIRY_CMD 0x12 |
| #define IDETAPE_ERASE_CMD 0x19 |
| #define IDETAPE_MODE_SENSE_CMD 0x1a |
| #define IDETAPE_MODE_SELECT_CMD 0x15 |
| #define IDETAPE_LOAD_UNLOAD_CMD 0x1b |
| #define IDETAPE_PREVENT_CMD 0x1e |
| #define IDETAPE_LOCATE_CMD 0x2b |
| #define IDETAPE_READ_POSITION_CMD 0x34 |
| #define IDETAPE_READ_BUFFER_CMD 0x3c |
| #define IDETAPE_SET_SPEED_CMD 0xbb |
| |
| /* |
| * Some defines for the READ BUFFER command |
| */ |
| #define IDETAPE_RETRIEVE_FAULTY_BLOCK 6 |
| |
| /* |
| * Some defines for the SPACE command |
| */ |
| #define IDETAPE_SPACE_OVER_FILEMARK 1 |
| #define IDETAPE_SPACE_TO_EOD 3 |
| |
| /* |
| * Some defines for the LOAD UNLOAD command |
| */ |
| #define IDETAPE_LU_LOAD_MASK 1 |
| #define IDETAPE_LU_RETENSION_MASK 2 |
| #define IDETAPE_LU_EOT_MASK 4 |
| |
| /* |
| * Special requests for our block device strategy routine. |
| * |
| * In order to service a character device command, we add special |
| * requests to the tail of our block device request queue and wait |
| * for their completion. |
| * |
| */ |
| #define IDETAPE_FIRST_RQ 90 |
| |
| /* |
| * IDETAPE_PC_RQ is used to queue a packet command in the request queue. |
| */ |
| #define IDETAPE_PC_RQ1 90 |
| #define IDETAPE_PC_RQ2 91 |
| |
| /* |
| * IDETAPE_READ_RQ and IDETAPE_WRITE_RQ are used by our |
| * character device interface to request read/write operations from |
| * our block device interface. |
| */ |
| #define IDETAPE_READ_RQ 92 |
| #define IDETAPE_WRITE_RQ 93 |
| #define IDETAPE_ABORTED_WRITE_RQ 94 |
| #define IDETAPE_ABORTED_READ_RQ 95 |
| #define IDETAPE_READ_BUFFER_RQ 96 |
| |
| #define IDETAPE_LAST_RQ 96 |
| |
| /* |
| * A macro which can be used to check if a we support a given |
| * request command. |
| */ |
| #define IDETAPE_RQ_CMD(cmd) ((cmd >= IDETAPE_FIRST_RQ) && (cmd <= IDETAPE_LAST_RQ)) |
| |
| /* |
| * Error codes which are returned in rq->errors to the higher part |
| * of the driver. |
| */ |
| #define IDETAPE_ERROR_GENERAL 101 |
| #define IDETAPE_ERROR_FILEMARK 102 |
| #define IDETAPE_ERROR_EOD 103 |
| |
| /* |
| * The ATAPI Status Register. |
| */ |
| typedef union { |
| unsigned all :8; |
| struct { |
| unsigned check :1; /* Error occurred */ |
| unsigned idx :1; /* Reserved */ |
| unsigned corr :1; /* Correctable error occurred */ |
| unsigned drq :1; /* Data is request by the device */ |
| unsigned dsc :1; /* Buffer availability / Media access command finished */ |
| unsigned reserved5 :1; /* Reserved */ |
| unsigned drdy :1; /* Ignored for ATAPI commands (ready to accept ATA command) */ |
| unsigned bsy :1; /* The device has access to the command block */ |
| } b; |
| } idetape_status_reg_t; |
| |
| /* |
| * The ATAPI error register. |
| */ |
| typedef union { |
| unsigned all :8; |
| struct { |
| unsigned ili :1; /* Illegal Length Indication */ |
| unsigned eom :1; /* End Of Media Detected */ |
| unsigned abrt :1; /* Aborted command - As defined by ATA */ |
| unsigned mcr :1; /* Media Change Requested - As defined by ATA */ |
| unsigned sense_key :4; /* Sense key of the last failed packet command */ |
| } b; |
| } idetape_error_reg_t; |
| |
| /* |
| * ATAPI Feature Register |
| */ |
| typedef union { |
| unsigned all :8; |
| struct { |
| unsigned dma :1; /* Using DMA or PIO */ |
| unsigned reserved321 :3; /* Reserved */ |
| unsigned reserved654 :3; /* Reserved (Tag Type) */ |
| unsigned reserved7 :1; /* Reserved */ |
| } b; |
| } idetape_feature_reg_t; |
| |
| /* |
| * ATAPI Byte Count Register. |
| */ |
| typedef union { |
| unsigned all :16; |
| struct { |
| unsigned low :8; /* LSB */ |
| unsigned high :8; /* MSB */ |
| } b; |
| } idetape_bcount_reg_t; |
| |
| /* |
| * ATAPI Interrupt Reason Register. |
| */ |
| typedef union { |
| unsigned all :8; |
| struct { |
| unsigned cod :1; /* Information transferred is command (1) or data (0) */ |
| unsigned io :1; /* The device requests us to read (1) or write (0) */ |
| unsigned reserved :6; /* Reserved */ |
| } b; |
| } idetape_ireason_reg_t; |
| |
| /* |
| * ATAPI Drive Select Register |
| */ |
| typedef union { |
| unsigned all :8; |
| struct { |
| unsigned sam_lun :4; /* Should be zero with ATAPI (not used) */ |
| unsigned drv :1; /* The responding drive will be drive 0 (0) or drive 1 (1) */ |
| unsigned one5 :1; /* Should be set to 1 */ |
| unsigned reserved6 :1; /* Reserved */ |
| unsigned one7 :1; /* Should be set to 1 */ |
| } b; |
| } idetape_drivesel_reg_t; |
| |
| /* |
| * ATAPI Device Control Register |
| */ |
| typedef union { |
| unsigned all :8; |
| struct { |
| unsigned zero0 :1; /* Should be set to zero */ |
| unsigned nien :1; /* Device interrupt is disabled (1) or enabled (0) */ |
| unsigned srst :1; /* ATA software reset. ATAPI devices should use the new ATAPI srst. */ |
| unsigned one3 :1; /* Should be set to 1 */ |
| unsigned reserved4567 :4; /* Reserved */ |
| } b; |
| } idetape_control_reg_t; |
| |
| /* |
| * idetape_chrdev_t provides the link between out character device |
| * interface and our block device interface and the corresponding |
| * ide_drive_t structure. |
| */ |
| typedef struct { |
| ide_drive_t *drive; |
| } idetape_chrdev_t; |
| |
| /* |
| * The following is used to format the general configuration word of |
| * the ATAPI IDENTIFY DEVICE command. |
| */ |
| struct idetape_id_gcw { |
| unsigned packet_size :2; /* Packet Size */ |
| unsigned reserved234 :3; /* Reserved */ |
| unsigned drq_type :2; /* Command packet DRQ type */ |
| unsigned removable :1; /* Removable media */ |
| unsigned device_type :5; /* Device type */ |
| unsigned reserved13 :1; /* Reserved */ |
| unsigned protocol :2; /* Protocol type */ |
| }; |
| |
| /* |
| * INQUIRY packet command - Data Format (From Table 6-8 of QIC-157C) |
| */ |
| typedef struct { |
| unsigned device_type :5; /* Peripheral Device Type */ |
| unsigned reserved0_765 :3; /* Peripheral Qualifier - Reserved */ |
| unsigned reserved1_6t0 :7; /* Reserved */ |
| unsigned rmb :1; /* Removable Medium Bit */ |
| unsigned ansi_version :3; /* ANSI Version */ |
| unsigned ecma_version :3; /* ECMA Version */ |
| unsigned iso_version :2; /* ISO Version */ |
| unsigned response_format :4; /* Response Data Format */ |
| unsigned reserved3_45 :2; /* Reserved */ |
| unsigned reserved3_6 :1; /* TrmIOP - Reserved */ |
| unsigned reserved3_7 :1; /* AENC - Reserved */ |
| __u8 additional_length; /* Additional Length (total_length-4) */ |
| __u8 rsv5, rsv6, rsv7; /* Reserved */ |
| __u8 vendor_id[8]; /* Vendor Identification */ |
| __u8 product_id[16]; /* Product Identification */ |
| __u8 revision_level[4]; /* Revision Level */ |
| __u8 vendor_specific[20]; /* Vendor Specific - Optional */ |
| __u8 reserved56t95[40]; /* Reserved - Optional */ |
| /* Additional information may be returned */ |
| } idetape_inquiry_result_t; |
| |
| /* |
| * READ POSITION packet command - Data Format (From Table 6-57) |
| */ |
| typedef struct { |
| unsigned reserved0_10 :2; /* Reserved */ |
| unsigned bpu :1; /* Block Position Unknown */ |
| unsigned reserved0_543 :3; /* Reserved */ |
| unsigned eop :1; /* End Of Partition */ |
| unsigned bop :1; /* Beginning Of Partition */ |
| u8 partition; /* Partition Number */ |
| u8 reserved2, reserved3; /* Reserved */ |
| u32 first_block; /* First Block Location */ |
| u32 last_block; /* Last Block Location (Optional) */ |
| u8 reserved12; /* Reserved */ |
| u8 blocks_in_buffer[3]; /* Blocks In Buffer - (Optional) */ |
| u32 bytes_in_buffer; /* Bytes In Buffer (Optional) */ |
| } idetape_read_position_result_t; |
| |
| /* |
| * Follows structures which are related to the SELECT SENSE / MODE SENSE |
| * packet commands. Those packet commands are still not supported |
| * by ide-tape. |
| */ |
| #define IDETAPE_BLOCK_DESCRIPTOR 0 |
| #define IDETAPE_CAPABILITIES_PAGE 0x2a |
| #define IDETAPE_PARAMTR_PAGE 0x2b /* Onstream DI-x0 only */ |
| #define IDETAPE_BLOCK_SIZE_PAGE 0x30 |
| #define IDETAPE_BUFFER_FILLING_PAGE 0x33 |
| |
| /* |
| * Mode Parameter Header for the MODE SENSE packet command |
| */ |
| typedef struct { |
| __u8 mode_data_length; /* Length of the following data transfer */ |
| __u8 medium_type; /* Medium Type */ |
| __u8 dsp; /* Device Specific Parameter */ |
| __u8 bdl; /* Block Descriptor Length */ |
| #if 0 |
| /* data transfer page */ |
| __u8 page_code :6; |
| __u8 reserved0_6 :1; |
| __u8 ps :1; /* parameters saveable */ |
| __u8 page_length; /* page Length == 0x02 */ |
| __u8 reserved2; |
| __u8 read32k :1; /* 32k blk size (data only) */ |
| __u8 read32k5 :1; /* 32.5k blk size (data&AUX) */ |
| __u8 reserved3_23 :2; |
| __u8 write32k :1; /* 32k blk size (data only) */ |
| __u8 write32k5 :1; /* 32.5k blk size (data&AUX) */ |
| __u8 reserved3_6 :1; |
| __u8 streaming :1; /* streaming mode enable */ |
| #endif |
| } idetape_mode_parameter_header_t; |
| |
| /* |
| * Mode Parameter Block Descriptor the MODE SENSE packet command |
| * |
| * Support for block descriptors is optional. |
| */ |
| typedef struct { |
| __u8 density_code; /* Medium density code */ |
| __u8 blocks[3]; /* Number of blocks */ |
| __u8 reserved4; /* Reserved */ |
| __u8 length[3]; /* Block Length */ |
| } idetape_parameter_block_descriptor_t; |
| |
| /* |
| * The Data Compression Page, as returned by the MODE SENSE packet command. |
| */ |
| typedef struct { |
| unsigned page_code :6; /* Page Code - Should be 0xf */ |
| unsigned reserved0 :1; /* Reserved */ |
| unsigned ps :1; |
| __u8 page_length; /* Page Length - Should be 14 */ |
| unsigned reserved2 :6; /* Reserved */ |
| unsigned dcc :1; /* Data Compression Capable */ |
| unsigned dce :1; /* Data Compression Enable */ |
| unsigned reserved3 :5; /* Reserved */ |
| unsigned red :2; /* Report Exception on Decompression */ |
| unsigned dde :1; /* Data Decompression Enable */ |
| __u32 ca; /* Compression Algorithm */ |
| __u32 da; /* Decompression Algorithm */ |
| __u8 reserved[4]; /* Reserved */ |
| } idetape_data_compression_page_t; |
| |
| /* |
| * The Medium Partition Page, as returned by the MODE SENSE packet command. |
| */ |
| typedef struct { |
| unsigned page_code :6; /* Page Code - Should be 0x11 */ |
| unsigned reserved1_6 :1; /* Reserved */ |
| unsigned ps :1; |
| __u8 page_length; /* Page Length - Should be 6 */ |
| __u8 map; /* Maximum Additional Partitions - Should be 0 */ |
| __u8 apd; /* Additional Partitions Defined - Should be 0 */ |
| unsigned reserved4_012 :3; /* Reserved */ |
| unsigned psum :2; /* Should be 0 */ |
| unsigned idp :1; /* Should be 0 */ |
| unsigned sdp :1; /* Should be 0 */ |
| unsigned fdp :1; /* Fixed Data Partitions */ |
| __u8 mfr; /* Medium Format Recognition */ |
| __u8 reserved[2]; /* Reserved */ |
| } idetape_medium_partition_page_t; |
| |
| /* |
| * Run time configurable parameters. |
| */ |
| typedef struct { |
| int dsc_rw_frequency; |
| int dsc_media_access_frequency; |
| int nr_stages; |
| } idetape_config_t; |
| |
| /* |
| * The variables below are used for the character device interface. |
| * Additional state variables are defined in our ide_drive_t structure. |
| */ |
| static idetape_chrdev_t idetape_chrdevs[MAX_HWIFS * MAX_DRIVES]; |
| static int idetape_chrdev_present = 0; |
| |
| #if IDETAPE_DEBUG_LOG_VERBOSE |
| |
| /* |
| * DO NOT REMOVE, BUILDING A VERBOSE DEBUG SCHEME FOR ATAPI |
| */ |
| |
| char *idetape_sense_key_verbose (byte idetape_sense_key) |
| { |
| switch (idetape_sense_key) { |
| default: { |
| char buf[22]; |
| sprintf(buf, "IDETAPE_SENSE (0x%02x)", idetape_sense_key); |
| return(buf); |
| } |
| |
| } |
| } |
| |
| char *idetape_command_key_verbose (byte idetape_command_key) |
| { |
| switch (idetape_command_key) { |
| case IDETAPE_TEST_UNIT_READY_CMD: return("TEST_UNIT_READY_CMD"); |
| case IDETAPE_REWIND_CMD: return("REWIND_CMD"); |
| case IDETAPE_REQUEST_SENSE_CMD: return("REQUEST_SENSE_CMD"); |
| case IDETAPE_READ_CMD: return("READ_CMD"); |
| case IDETAPE_WRITE_CMD: return("WRITE_CMD"); |
| case IDETAPE_WRITE_FILEMARK_CMD: return("WRITE_FILEMARK_CMD"); |
| case IDETAPE_SPACE_CMD: return("SPACE_CMD"); |
| case IDETAPE_INQUIRY_CMD: return("INQUIRY_CMD"); |
| case IDETAPE_ERASE_CMD: return("ERASE_CMD"); |
| case IDETAPE_MODE_SENSE_CMD: return("MODE_SENSE_CMD"); |
| case IDETAPE_MODE_SELECT_CMD: return("MODE_SELECT_CMD"); |
| case IDETAPE_LOAD_UNLOAD_CMD: return("LOAD_UNLOAD_CMD"); |
| case IDETAPE_PREVENT_CMD: return("PREVENT_CMD"); |
| case IDETAPE_LOCATE_CMD: return("LOCATE_CMD"); |
| case IDETAPE_READ_POSITION_CMD: return("READ_POSITION_CMD"); |
| case IDETAPE_READ_BUFFER_CMD: return("READ_BUFFER_CMD"); |
| case IDETAPE_SET_SPEED_CMD: return("SET_SPEED_CMD"); |
| default: { |
| char buf[20]; |
| sprintf(buf, "CMD (0x%02x)", idetape_command_key); |
| return(buf); |
| } |
| } |
| } |
| #endif /* IDETAPE_DEBUG_LOG_VERBOSE */ |
| |
| /* |
| * Function declarations |
| * |
| */ |
| static void idetape_onstream_mode_sense_tape_parameter_page(ide_drive_t *drive, int debug); |
| static int idetape_chrdev_release (struct inode *inode, struct file *filp); |
| static void idetape_write_release (struct inode *inode); |
| |
| /* |
| * Too bad. The drive wants to send us data which we are not ready to accept. |
| * Just throw it away. |
| */ |
| static void idetape_discard_data (ide_drive_t *drive, unsigned int bcount) |
| { |
| while (bcount--) |
| IN_BYTE (IDE_DATA_REG); |
| } |
| |
| static void idetape_input_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) |
| { |
| struct bio *bio = pc->bio; |
| int count; |
| |
| while (bcount) { |
| #if IDETAPE_DEBUG_BUGS |
| if (bio == NULL) { |
| printk (KERN_ERR "ide-tape: bio == NULL in idetape_input_buffers\n"); |
| idetape_discard_data (drive, bcount); |
| return; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| count = min(bio->bi_size - pc->b_count, bcount); |
| atapi_input_bytes (drive, bio_data(bio) + pc->b_count, count); |
| bcount -= count; |
| pc->b_count += bio->bi_size; |
| if (pc->b_count == bio->bi_size) { |
| bio = bio->bi_next; |
| if (bio) |
| pc->b_count = 0; |
| } |
| } |
| pc->bio = bio; |
| } |
| |
| static void idetape_output_buffers (ide_drive_t *drive, idetape_pc_t *pc, unsigned int bcount) |
| { |
| struct bio *bio = pc->bio; |
| int count; |
| |
| while (bcount) { |
| #if IDETAPE_DEBUG_BUGS |
| if (bio == NULL) { |
| printk (KERN_ERR "ide-tape: bio == NULL in idetape_output_buffers\n"); |
| return; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| count = min(pc->b_count, bcount); |
| atapi_output_bytes (drive, bio_data(bio), count); |
| bcount -= count; |
| pc->b_data += count; |
| pc->b_count -= count; |
| if (!pc->b_count) { |
| pc->bio = bio = bio->bi_next; |
| if (bio) { |
| pc->b_data = bio_data(bio); |
| pc->b_count = bio->bi_size; |
| } |
| } |
| } |
| } |
| |
| #ifdef CONFIG_BLK_DEV_IDEDMA |
| static void idetape_update_buffers (idetape_pc_t *pc) |
| { |
| struct bio *bio = pc->bio; |
| int count, bcount = pc->actually_transferred; |
| |
| if (test_bit (PC_WRITING, &pc->flags)) |
| return; |
| while (bcount) { |
| #if IDETAPE_DEBUG_BUGS |
| if (bio == NULL) { |
| printk (KERN_ERR "ide-tape: bio == NULL in idetape_update_buffers\n"); |
| return; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| count = min(bio->bi_size, bcount); |
| pc->b_count = count; |
| if (pc->b_count == bio->bi_size) |
| bio = bio->bi_next; |
| bcount -= count; |
| } |
| pc->bio = bio; |
| } |
| #endif /* CONFIG_BLK_DEV_IDEDMA */ |
| |
| /* |
| * idetape_next_pc_storage returns a pointer to a place in which we can |
| * safely store a packet command, even though we intend to leave the |
| * driver. A storage space for a maximum of IDETAPE_PC_STACK packet |
| * commands is allocated at initialization time. |
| */ |
| static idetape_pc_t *idetape_next_pc_storage (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 5) |
| printk (KERN_INFO "ide-tape: pc_stack_index=%d\n",tape->pc_stack_index); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| if (tape->pc_stack_index==IDETAPE_PC_STACK) |
| tape->pc_stack_index=0; |
| return (&tape->pc_stack[tape->pc_stack_index++]); |
| } |
| |
| /* |
| * idetape_next_rq_storage is used along with idetape_next_pc_storage. |
| * Since we queue packet commands in the request queue, we need to |
| * allocate a request, along with the allocation of a packet command. |
| */ |
| |
| /************************************************************** |
| * * |
| * This should get fixed to use kmalloc(.., GFP_ATOMIC) * |
| * followed later on by kfree(). -ml * |
| * * |
| **************************************************************/ |
| |
| static struct request *idetape_next_rq_storage (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 5) |
| printk (KERN_INFO "ide-tape: rq_stack_index=%d\n",tape->rq_stack_index); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| if (tape->rq_stack_index==IDETAPE_PC_STACK) |
| tape->rq_stack_index=0; |
| return (&tape->rq_stack[tape->rq_stack_index++]); |
| } |
| |
| /* |
| * idetape_init_pc initializes a packet command. |
| */ |
| static void idetape_init_pc (idetape_pc_t *pc) |
| { |
| memset (pc->c, 0, 12); |
| pc->retries = 0; |
| pc->flags = 0; |
| pc->request_transfer = 0; |
| pc->buffer = pc->pc_buffer; |
| pc->buffer_size = IDETAPE_PC_BUFFER_SIZE; |
| pc->bio = NULL; |
| pc->b_data = NULL; |
| } |
| |
| /* |
| * idetape_analyze_error is called on each failed packet command retry |
| * to analyze the request sense. We currently do not utilize this |
| * information. |
| */ |
| static void idetape_analyze_error (ide_drive_t *drive, idetape_request_sense_result_t *result) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t *pc = tape->failed_pc; |
| |
| tape->sense = *result; |
| tape->sense_key = result->sense_key; |
| tape->asc = result->asc; |
| tape->ascq = result->ascq; |
| #if IDETAPE_DEBUG_LOG |
| /* |
| * Without debugging, we only log an error if we decided to |
| * give up retrying. |
| */ |
| if (tape->debug_level >= 1) |
| printk (KERN_INFO "ide-tape: pc = %x, sense key = %x, asc = %x, ascq = %x\n", |
| pc->c[0], result->sense_key, result->asc, result->ascq); |
| #if IDETAPE_DEBUG_LOG_VERBOSE |
| if (tape->debug_level >= 1) |
| printk (KERN_INFO "ide-tape: pc = %s, sense key = %x, asc = %x, ascq = %x\n", |
| idetape_command_key_verbose((byte) pc->c[0]), |
| result->sense_key, |
| result->asc, |
| result->ascq); |
| #endif /* IDETAPE_DEBUG_LOG_VERBOSE */ |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| if (tape->onstream && result->sense_key == 2 && result->asc == 0x53 && result->ascq == 2) { |
| clear_bit(PC_DMA_ERROR, &pc->flags); |
| ide_stall_queue(drive, HZ / 2); |
| return; |
| } |
| #ifdef CONFIG_BLK_DEV_IDEDMA |
| |
| /* |
| * Correct pc->actually_transferred by asking the tape. |
| */ |
| if (test_bit (PC_DMA_ERROR, &pc->flags)) { |
| pc->actually_transferred = pc->request_transfer - tape->tape_block_size * ntohl (get_unaligned (&result->information)); |
| idetape_update_buffers (pc); |
| } |
| #endif /* CONFIG_BLK_DEV_IDEDMA */ |
| if (pc->c[0] == IDETAPE_READ_CMD && result->filemark) { |
| pc->error = IDETAPE_ERROR_FILEMARK; |
| set_bit (PC_ABORT, &pc->flags); |
| } |
| if (pc->c[0] == IDETAPE_WRITE_CMD) { |
| if (result->eom || (result->sense_key == 0xd && result->asc == 0x0 && result->ascq == 0x2)) { |
| pc->error = IDETAPE_ERROR_EOD; |
| set_bit (PC_ABORT, &pc->flags); |
| } |
| } |
| if (pc->c[0] == IDETAPE_READ_CMD || pc->c[0] == IDETAPE_WRITE_CMD) { |
| if (result->sense_key == 8) { |
| pc->error = IDETAPE_ERROR_EOD; |
| set_bit (PC_ABORT, &pc->flags); |
| } |
| if (!test_bit (PC_ABORT, &pc->flags) && (tape->onstream || pc->actually_transferred)) |
| pc->retries = IDETAPE_MAX_PC_RETRIES + 1; |
| } |
| } |
| |
| static void idetape_abort_pipeline (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *stage = tape->next_stage; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk(KERN_INFO "ide-tape: %s: idetape_abort_pipeline called\n", tape->name); |
| #endif |
| while (stage) { |
| if (stage->rq.flags == IDETAPE_WRITE_RQ) |
| stage->rq.flags = IDETAPE_ABORTED_WRITE_RQ; |
| else if (stage->rq.flags == IDETAPE_READ_RQ) |
| stage->rq.flags = IDETAPE_ABORTED_READ_RQ; |
| stage = stage->next; |
| } |
| } |
| |
| /* |
| * idetape_active_next_stage will declare the next stage as "active". |
| */ |
| static void idetape_active_next_stage (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *stage = tape->next_stage; |
| struct request *rq = &stage->rq; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_active_next_stage\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| #if IDETAPE_DEBUG_BUGS |
| if (stage == NULL) { |
| printk (KERN_ERR "ide-tape: bug: Trying to activate a non existing stage\n"); |
| return; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| |
| rq->buffer = NULL; |
| rq->bio = stage->bio; |
| tape->active_data_request = rq; |
| tape->active_stage = stage; |
| tape->next_stage = stage->next; |
| } |
| |
| /* |
| * idetape_increase_max_pipeline_stages is a part of the feedback |
| * loop which tries to find the optimum number of stages. In the |
| * feedback loop, we are starting from a minimum maximum number of |
| * stages, and if we sense that the pipeline is empty, we try to |
| * increase it, until we reach the user compile time memory limit. |
| */ |
| static void idetape_increase_max_pipeline_stages (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int increase = (tape->max_pipeline - tape->min_pipeline) / 10; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_increase_max_pipeline_stages\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| tape->max_stages += increase; |
| tape->max_stages = max(tape->max_stages, tape->min_pipeline); |
| tape->max_stages = min(tape->max_stages, tape->max_pipeline); |
| } |
| |
| /* |
| * idetape_kfree_stage calls kfree to completely free a stage, along with |
| * its related buffers. |
| */ |
| static void __idetape_kfree_stage (idetape_stage_t *stage) |
| { |
| struct bio *prev_bio, *bio = stage->bio; |
| int size; |
| |
| while (bio != NULL) { |
| if (bio_data(bio) != NULL) { |
| size = (int) bio->bi_size; |
| while (size > 0) { |
| free_page ((unsigned long) bio_data(bio)); |
| size -= PAGE_SIZE; |
| bio->bi_size += PAGE_SIZE; |
| } |
| } |
| prev_bio = bio; |
| bio = bio->bi_next; |
| kfree (prev_bio); |
| } |
| kfree (stage); |
| } |
| |
| static void idetape_kfree_stage (idetape_tape_t *tape, idetape_stage_t *stage) |
| { |
| __idetape_kfree_stage (stage); |
| } |
| |
| /* |
| * idetape_remove_stage_head removes tape->first_stage from the pipeline. |
| * The caller should avoid race conditions. |
| */ |
| static void idetape_remove_stage_head (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *stage; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_remove_stage_head\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| #if IDETAPE_DEBUG_BUGS |
| if (tape->first_stage == NULL) { |
| printk (KERN_ERR "ide-tape: bug: tape->first_stage is NULL\n"); |
| return; |
| } |
| if (tape->active_stage == tape->first_stage) { |
| printk (KERN_ERR "ide-tape: bug: Trying to free our active pipeline stage\n"); |
| return; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| stage = tape->first_stage; |
| tape->first_stage = stage->next; |
| idetape_kfree_stage (tape, stage); |
| tape->nr_stages--; |
| if (tape->first_stage == NULL) { |
| tape->last_stage = NULL; |
| #if IDETAPE_DEBUG_BUGS |
| if (tape->next_stage != NULL) |
| printk (KERN_ERR "ide-tape: bug: tape->next_stage != NULL\n"); |
| if (tape->nr_stages) |
| printk (KERN_ERR "ide-tape: bug: nr_stages should be 0 now\n"); |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| } |
| } |
| |
| /* |
| * idetape_end_request is used to finish servicing a request, and to |
| * insert a pending pipeline request into the main device queue. |
| */ |
| static int idetape_end_request(ide_drive_t *drive, int uptodate) |
| { |
| struct request *rq = HWGROUP(drive)->rq; |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned long flags; |
| int error; |
| int remove_stage = 0; |
| #if ONSTREAM_DEBUG |
| idetape_stage_t *stage; |
| os_aux_t *aux; |
| unsigned char *p; |
| #endif |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_end_request\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| switch (uptodate) { |
| case 0: error = IDETAPE_ERROR_GENERAL; break; |
| case 1: error = 0; break; |
| default: error = uptodate; |
| } |
| rq->errors = error; |
| if (error) |
| tape->failed_pc = NULL; |
| |
| spin_lock_irqsave(&tape->spinlock, flags); |
| if (tape->active_data_request == rq) { /* The request was a pipelined data transfer request */ |
| tape->active_stage = NULL; |
| tape->active_data_request = NULL; |
| tape->nr_pending_stages--; |
| if (rq->flags == IDETAPE_WRITE_RQ) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) { |
| if (tape->onstream) { |
| stage = tape->first_stage; |
| aux = stage->aux; |
| p = bio_data(stage->bio); |
| if (ntohl(aux->logical_blk_num) < 11300 && ntohl(aux->logical_blk_num) > 11100) |
| printk(KERN_INFO "ide-tape: finished writing logical blk %u (data %x %x %x %x)\n", ntohl(aux->logical_blk_num), *p++, *p++, *p++, *p++); |
| } |
| } |
| #endif |
| if (tape->onstream && !tape->raw) { |
| if (tape->first_frame_position == OS_DATA_ENDFRAME1) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk("ide-tape: %s: skipping over config parition..\n", tape->name); |
| #endif |
| tape->onstream_write_error = OS_PART_ERROR; |
| if (tape->waiting) |
| complete(tape->waiting); |
| } |
| } |
| remove_stage = 1; |
| if (error) { |
| set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); |
| if (error == IDETAPE_ERROR_EOD) |
| idetape_abort_pipeline (drive); |
| if (tape->onstream && !tape->raw && error == IDETAPE_ERROR_GENERAL && tape->sense.sense_key == 3) { |
| clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); |
| printk(KERN_ERR "ide-tape: %s: write error, enabling error recovery\n", tape->name); |
| tape->onstream_write_error = OS_WRITE_ERROR; |
| remove_stage = 0; |
| tape->nr_pending_stages++; |
| tape->next_stage = tape->first_stage; |
| rq->current_nr_sectors = rq->nr_sectors; |
| if (tape->waiting) |
| complete(tape->waiting); |
| } |
| } |
| } else if (rq->flags == IDETAPE_READ_RQ) { |
| if (error == IDETAPE_ERROR_EOD) { |
| set_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); |
| idetape_abort_pipeline(drive); |
| } |
| } |
| if (tape->next_stage != NULL && !tape->onstream_write_error) { |
| idetape_active_next_stage (drive); |
| |
| /* |
| * Insert the next request into the request queue. |
| */ |
| (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end); |
| } else if (!error) { |
| if (!tape->onstream) |
| idetape_increase_max_pipeline_stages (drive); |
| } |
| } |
| ide_end_drive_cmd (drive, 0, 0); |
| if (remove_stage) |
| idetape_remove_stage_head (drive); |
| if (tape->active_data_request == NULL) |
| clear_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| |
| return 0; |
| } |
| |
| static ide_startstop_t idetape_request_sense_callback (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_request_sense_callback\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| if (!tape->pc->error) { |
| idetape_analyze_error (drive, (idetape_request_sense_result_t *) tape->pc->buffer); |
| idetape_end_request(drive, 1); |
| } else { |
| printk (KERN_ERR "ide-tape: Error in REQUEST SENSE itself - Aborting request!\n"); |
| idetape_end_request(drive, 0); |
| } |
| return ide_stopped; |
| } |
| |
| static void idetape_create_request_sense_cmd (idetape_pc_t *pc) |
| { |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_REQUEST_SENSE_CMD; |
| pc->c[4] = 20; |
| pc->request_transfer = 18; |
| pc->callback = &idetape_request_sense_callback; |
| } |
| |
| /* |
| * idetape_queue_pc_head generates a new packet command request in front |
| * of the request queue, before the current request, so that it will be |
| * processed immediately, on the next pass through the driver. |
| * |
| * idetape_queue_pc_head is called from the request handling part of |
| * the driver (the "bottom" part). Safe storage for the request should |
| * be allocated with idetape_next_pc_storage and idetape_next_rq_storage |
| * before calling idetape_queue_pc_head. |
| * |
| * Memory for those requests is pre-allocated at initialization time, and |
| * is limited to IDETAPE_PC_STACK requests. We assume that we have enough |
| * space for the maximum possible number of inter-dependent packet commands. |
| * |
| * The higher level of the driver - The ioctl handler and the character |
| * device handling functions should queue request to the lower level part |
| * and wait for their completion using idetape_queue_pc_tail or |
| * idetape_queue_rw_tail. |
| */ |
| static void idetape_queue_pc_head (ide_drive_t *drive,idetape_pc_t *pc,struct request *rq) |
| { |
| ide_init_drive_cmd (rq); |
| rq->buffer = (char *) pc; |
| rq->flags = IDETAPE_PC_RQ1; |
| (void) ide_do_drive_cmd (drive, rq, ide_preempt); |
| } |
| |
| /* |
| * idetape_retry_pc is called when an error was detected during the |
| * last packet command. We queue a request sense packet command in |
| * the head of the request list. |
| */ |
| static ide_startstop_t idetape_retry_pc (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t *pc; |
| struct request *rq; |
| idetape_error_reg_t error; |
| |
| error.all = IN_BYTE (IDE_ERROR_REG); |
| pc = idetape_next_pc_storage (drive); |
| rq = idetape_next_rq_storage (drive); |
| idetape_create_request_sense_cmd (pc); |
| set_bit (IDETAPE_IGNORE_DSC, &tape->flags); |
| idetape_queue_pc_head (drive, pc, rq); |
| return ide_stopped; |
| } |
| |
| /* |
| * idetape_postpone_request postpones the current request so that |
| * ide.c will be able to service requests from another device on |
| * the same interface while we are polling for DSC. |
| */ |
| static void idetape_postpone_request (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk(KERN_INFO "ide-tape: idetape_postpone_request\n"); |
| #endif |
| tape->postponed_rq = HWGROUP(drive)->rq; |
| ide_stall_queue(drive, tape->dsc_polling_frequency); |
| } |
| |
| /* |
| * idetape_pc_intr is the usual interrupt handler which will be called |
| * during a packet command. We will transfer some of the data (as |
| * requested by the drive) and will re-point interrupt handler to us. |
| * When data transfer is finished, we will act according to the |
| * algorithm described before idetape_issue_packet_command. |
| * |
| */ |
| static ide_startstop_t idetape_pc_intr (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_status_reg_t status; |
| idetape_bcount_reg_t bcount; |
| idetape_ireason_reg_t ireason; |
| idetape_pc_t *pc = tape->pc; |
| |
| unsigned int temp; |
| unsigned long cmd_time; |
| #if SIMULATE_ERRORS |
| static int error_sim_count = 0; |
| #endif |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_pc_intr interrupt handler\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| status.all = GET_STAT(); /* Clear the interrupt */ |
| |
| #ifdef CONFIG_BLK_DEV_IDEDMA |
| if (test_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { |
| if (drive->channel->dmaproc(ide_dma_end, drive)) { |
| /* |
| * A DMA error is sometimes expected. For example, |
| * if the tape is crossing a filemark during a |
| * READ command, it will issue an irq and position |
| * itself before the filemark, so that only a partial |
| * data transfer will occur (which causes the DMA |
| * error). In that case, we will later ask the tape |
| * how much bytes of the original request were |
| * actually transferred (we can't receive that |
| * information from the DMA engine on most chipsets). |
| */ |
| set_bit (PC_DMA_ERROR, &pc->flags); |
| } else if (!status.b.check) { |
| pc->actually_transferred = pc->request_transfer; |
| idetape_update_buffers (pc); |
| } |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: DMA finished\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| } |
| #endif /* CONFIG_BLK_DEV_IDEDMA */ |
| |
| if (!status.b.drq) { /* No more interrupts */ |
| cmd_time = (jiffies - tape->cmd_start_time) * 1000 / HZ; |
| tape->max_cmd_time = max(cmd_time, tape->max_cmd_time); |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk (KERN_INFO "ide-tape: Packet command completed, %d bytes transferred\n", pc->actually_transferred); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| clear_bit (PC_DMA_IN_PROGRESS, &pc->flags); |
| |
| ide__sti(); /* local CPU only */ |
| |
| #if SIMULATE_ERRORS |
| if ((pc->c[0] == IDETAPE_WRITE_CMD || pc->c[0] == IDETAPE_READ_CMD) && (++error_sim_count % 100) == 0) { |
| printk(KERN_INFO "ide-tape: %s: simulating error\n", tape->name); |
| status.b.check = 1; |
| } |
| #endif |
| if (status.b.check && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) |
| status.b.check = 0; |
| if (status.b.check || test_bit (PC_DMA_ERROR, &pc->flags)) { /* Error detected */ |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 1) |
| printk (KERN_INFO "ide-tape: %s: I/O error, ",tape->name); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| if (pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { |
| printk (KERN_ERR "ide-tape: I/O error in request sense command\n"); |
| return ide_stopped; |
| } |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 1) |
| printk(KERN_INFO "ide-tape: [cmd %x]: check condition\n", pc->c[0]); |
| #endif |
| return idetape_retry_pc (drive); /* Retry operation */ |
| } |
| pc->error = 0; |
| if (!tape->onstream && test_bit (PC_WAIT_FOR_DSC, &pc->flags) && !status.b.dsc) { /* Media access command */ |
| tape->dsc_polling_start = jiffies; |
| tape->dsc_polling_frequency = IDETAPE_DSC_MA_FAST; |
| tape->dsc_timeout = jiffies + IDETAPE_DSC_MA_TIMEOUT; |
| idetape_postpone_request (drive); /* Allow ide.c to handle other requests */ |
| return ide_stopped; |
| } |
| if (tape->failed_pc == pc) |
| tape->failed_pc = NULL; |
| return pc->callback(drive); /* Command finished - Call the callback function */ |
| } |
| #ifdef CONFIG_BLK_DEV_IDEDMA |
| if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { |
| printk (KERN_ERR "ide-tape: The tape wants to issue more interrupts in DMA mode\n"); |
| printk (KERN_ERR "ide-tape: DMA disabled, reverting to PIO\n"); |
| drive->channel->dmaproc(ide_dma_off, drive); |
| return ide_stopped; |
| } |
| #endif /* CONFIG_BLK_DEV_IDEDMA */ |
| bcount.b.high = IN_BYTE (IDE_BCOUNTH_REG); /* Get the number of bytes to transfer */ |
| bcount.b.low = IN_BYTE (IDE_BCOUNTL_REG); /* on this interrupt */ |
| ireason.all = IN_BYTE (IDE_IREASON_REG); |
| |
| if (ireason.b.cod) { |
| printk (KERN_ERR "ide-tape: CoD != 0 in idetape_pc_intr\n"); |
| return ide_stopped; |
| } |
| if (ireason.b.io == test_bit (PC_WRITING, &pc->flags)) { /* Hopefully, we will never get here */ |
| printk (KERN_ERR "ide-tape: We wanted to %s, ", ireason.b.io ? "Write":"Read"); |
| printk (KERN_ERR "ide-tape: but the tape wants us to %s !\n",ireason.b.io ? "Read":"Write"); |
| return ide_stopped; |
| } |
| if (!test_bit (PC_WRITING, &pc->flags)) { /* Reading - Check that we have enough space */ |
| temp = pc->actually_transferred + bcount.all; |
| if ( temp > pc->request_transfer) { |
| if (temp > pc->buffer_size) { |
| printk (KERN_ERR "ide-tape: The tape wants to send us more data than expected - discarding data\n"); |
| idetape_discard_data (drive, bcount.all); |
| BUG_ON(HWGROUP(drive)->handler); |
| ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); |
| return ide_started; |
| } |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk (KERN_NOTICE "ide-tape: The tape wants to send us more data than expected - allowing transfer\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| } |
| } |
| if (test_bit (PC_WRITING, &pc->flags)) { |
| if (pc->bio != NULL) |
| idetape_output_buffers (drive, pc, bcount.all); |
| else |
| atapi_output_bytes (drive,pc->current_position,bcount.all); /* Write the current buffer */ |
| } else { |
| if (pc->bio != NULL) |
| idetape_input_buffers (drive, pc, bcount.all); |
| else |
| atapi_input_bytes (drive,pc->current_position,bcount.all); /* Read the current buffer */ |
| } |
| pc->actually_transferred += bcount.all; /* Update the current position */ |
| pc->current_position+=bcount.all; |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: [cmd %x] transferred %d bytes on that interrupt\n", pc->c[0], bcount.all); |
| #endif |
| BUG_ON(HWGROUP(drive)->handler); |
| ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); /* And set the interrupt handler again */ |
| return ide_started; |
| } |
| |
| /* |
| * Packet Command Interface |
| * |
| * The current Packet Command is available in tape->pc, and will not |
| * change until we finish handling it. Each packet command is associated |
| * with a callback function that will be called when the command is |
| * finished. |
| * |
| * The handling will be done in three stages: |
| * |
| * 1. idetape_issue_packet_command will send the packet command to the |
| * drive, and will set the interrupt handler to idetape_pc_intr. |
| * |
| * 2. On each interrupt, idetape_pc_intr will be called. This step |
| * will be repeated until the device signals us that no more |
| * interrupts will be issued. |
| * |
| * 3. ATAPI Tape media access commands have immediate status with a |
| * delayed process. In case of a successful initiation of a |
| * media access packet command, the DSC bit will be set when the |
| * actual execution of the command is finished. |
| * Since the tape drive will not issue an interrupt, we have to |
| * poll for this event. In this case, we define the request as |
| * "low priority request" by setting rq_status to |
| * IDETAPE_RQ_POSTPONED, set a timer to poll for DSC and exit |
| * the driver. |
| * |
| * ide.c will then give higher priority to requests which |
| * originate from the other device, until will change rq_status |
| * to RQ_ACTIVE. |
| * |
| * 4. When the packet command is finished, it will be checked for errors. |
| * |
| * 5. In case an error was found, we queue a request sense packet command |
| * in front of the request queue and retry the operation up to |
| * IDETAPE_MAX_PC_RETRIES times. |
| * |
| * 6. In case no error was found, or we decided to give up and not |
| * to retry again, the callback function will be called and then |
| * we will handle the next request. |
| * |
| */ |
| static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t *pc = tape->pc; |
| idetape_ireason_reg_t ireason; |
| int retries = 100; |
| ide_startstop_t startstop; |
| |
| if (ide_wait_stat (&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { |
| printk (KERN_ERR "ide-tape: Strange, packet command initiated yet DRQ isn't asserted\n"); |
| return startstop; |
| } |
| ireason.all = IN_BYTE (IDE_IREASON_REG); |
| while (retries-- && (!ireason.b.cod || ireason.b.io)) { |
| printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing a packet command, retrying\n"); |
| udelay(100); |
| ireason.all = IN_BYTE(IDE_IREASON_REG); |
| if (retries == 0) { |
| printk(KERN_ERR "ide-tape: (IO,CoD != (0,1) while issuing a packet command, ignoring\n"); |
| ireason.b.cod = 1; |
| ireason.b.io = 0; |
| } |
| } |
| if (!ireason.b.cod || ireason.b.io) { |
| printk (KERN_ERR "ide-tape: (IO,CoD) != (0,1) while issuing a packet command\n"); |
| return ide_stopped; |
| } |
| tape->cmd_start_time = jiffies; |
| BUG_ON(HWGROUP(drive)->handler); |
| ide_set_handler(drive, &idetape_pc_intr, IDETAPE_WAIT_CMD, NULL); /* Set the interrupt routine */ |
| atapi_output_bytes (drive,pc->c,12); /* Send the actual packet */ |
| return ide_started; |
| } |
| |
| static ide_startstop_t idetape_issue_packet_command (ide_drive_t *drive, idetape_pc_t *pc) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_bcount_reg_t bcount; |
| int dma_ok = 0; |
| |
| #if IDETAPE_DEBUG_BUGS |
| if (tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD && pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { |
| printk (KERN_ERR "ide-tape: possible ide-tape.c bug - Two request sense in serial were issued\n"); |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| |
| if (tape->failed_pc == NULL && pc->c[0] != IDETAPE_REQUEST_SENSE_CMD) |
| tape->failed_pc = pc; |
| tape->pc = pc; /* Set the current packet command */ |
| |
| if (pc->retries > IDETAPE_MAX_PC_RETRIES || test_bit (PC_ABORT, &pc->flags)) { |
| /* |
| * We will "abort" retrying a packet command in case |
| * a legitimate error code was received (crossing a |
| * filemark, or DMA error in the end of media, for |
| * example). |
| */ |
| if (!test_bit (PC_ABORT, &pc->flags)) { |
| if (!(pc->c[0] == IDETAPE_TEST_UNIT_READY_CMD && tape->sense_key == 2 && |
| tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8))) { |
| printk (KERN_ERR "ide-tape: %s: I/O error, pc = %2x, key = %2x, asc = %2x, ascq = %2x\n", |
| tape->name, pc->c[0], tape->sense_key, tape->asc, tape->ascq); |
| if (tape->onstream && pc->c[0] == IDETAPE_READ_CMD && tape->sense_key == 3 && tape->asc == 0x11) /* AJN-1: 11 should be 0x11 */ |
| printk(KERN_ERR "ide-tape: %s: enabling read error recovery\n", tape->name); |
| } |
| pc->error = IDETAPE_ERROR_GENERAL; /* Giving up */ |
| } |
| tape->failed_pc = NULL; |
| return pc->callback(drive); |
| } |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk (KERN_INFO "ide-tape: Retry number - %d\n", pc->retries); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| pc->retries++; |
| pc->actually_transferred = 0; /* We haven't transferred any data yet */ |
| pc->current_position=pc->buffer; |
| bcount.all=pc->request_transfer; /* Request to transfer the entire buffer at once */ |
| |
| #ifdef CONFIG_BLK_DEV_IDEDMA |
| if (test_and_clear_bit (PC_DMA_ERROR, &pc->flags)) { |
| printk (KERN_WARNING "ide-tape: DMA disabled, reverting to PIO\n"); |
| (void) drive->channel->dmaproc(ide_dma_off, drive); |
| } |
| if (test_bit (PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) |
| dma_ok = !drive->channel->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive); |
| #endif /* CONFIG_BLK_DEV_IDEDMA */ |
| |
| if (IDE_CONTROL_REG) |
| OUT_BYTE (drive->ctl, IDE_CONTROL_REG); |
| OUT_BYTE (dma_ok ? 1 : 0, IDE_FEATURE_REG); /* Use PIO/DMA */ |
| OUT_BYTE (bcount.b.high, IDE_BCOUNTH_REG); |
| OUT_BYTE (bcount.b.low, IDE_BCOUNTL_REG); |
| OUT_BYTE (drive->select.all, IDE_SELECT_REG); |
| #ifdef CONFIG_BLK_DEV_IDEDMA |
| if (dma_ok) { /* Begin DMA, if necessary */ |
| set_bit (PC_DMA_IN_PROGRESS, &pc->flags); |
| (void) drive->channel->dmaproc(ide_dma_begin, drive); |
| } |
| #endif /* CONFIG_BLK_DEV_IDEDMA */ |
| if (test_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags)) { |
| BUG_ON(HWGROUP(drive)->handler); |
| ide_set_handler(drive, &idetape_transfer_pc, IDETAPE_WAIT_CMD, NULL); |
| OUT_BYTE(WIN_PACKETCMD, IDE_COMMAND_REG); |
| return ide_started; |
| } else { |
| OUT_BYTE(WIN_PACKETCMD, IDE_COMMAND_REG); |
| return idetape_transfer_pc(drive); |
| } |
| } |
| |
| /* |
| * General packet command callback function. |
| */ |
| static ide_startstop_t idetape_pc_callback (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_pc_callback\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| idetape_end_request(drive, tape->pc->error ? 0 : 1); |
| return ide_stopped; |
| } |
| |
| /* |
| * A mode sense command is used to "sense" tape parameters. |
| */ |
| static void idetape_create_mode_sense_cmd (idetape_pc_t *pc, byte page_code) |
| { |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_MODE_SENSE_CMD; |
| if (page_code != IDETAPE_BLOCK_DESCRIPTOR) |
| pc->c[1] = 8; /* DBD = 1 - Don't return block descriptors */ |
| pc->c[2] = page_code; |
| pc->c[3] = 255; /* Don't limit the returned information */ |
| pc->c[4] = 255; /* (We will just discard data in that case) */ |
| if (page_code == IDETAPE_BLOCK_DESCRIPTOR) |
| pc->request_transfer = 12; |
| else if (page_code == IDETAPE_CAPABILITIES_PAGE) |
| pc->request_transfer = 24; |
| else |
| pc->request_transfer = 50; |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| static ide_startstop_t idetape_onstream_buffer_fill_callback (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| tape->max_frames = tape->pc->buffer[4 + 2]; |
| tape->cur_frames = tape->pc->buffer[4 + 3]; |
| if (tape->chrdev_direction == idetape_direction_write) |
| tape->tape_head = tape->buffer_head - tape->cur_frames; |
| else |
| tape->tape_head = tape->buffer_head + tape->cur_frames; |
| if (tape->tape_head != tape->last_tape_head) { |
| tape->last_tape_head = tape->tape_head; |
| tape->tape_still_time_begin = jiffies; |
| if (tape->tape_still_time > 200) |
| tape->measure_insert_time = 1; |
| } |
| tape->tape_still_time = (jiffies - tape->tape_still_time_begin) * 1000 / HZ; |
| #if USE_IOTRACE |
| IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); |
| #endif |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 1) |
| printk(KERN_INFO "ide-tape: buffer fill callback, %d/%d\n", tape->cur_frames, tape->max_frames); |
| #endif |
| idetape_end_request(drive, tape->pc->error ? 0 : 1); |
| return ide_stopped; |
| } |
| |
| static void idetape_queue_onstream_buffer_fill (ide_drive_t *drive) |
| { |
| idetape_pc_t *pc; |
| struct request *rq; |
| |
| pc = idetape_next_pc_storage (drive); |
| rq = idetape_next_rq_storage (drive); |
| idetape_create_mode_sense_cmd (pc, IDETAPE_BUFFER_FILLING_PAGE); |
| pc->callback = idetape_onstream_buffer_fill_callback; |
| idetape_queue_pc_head (drive, pc, rq); |
| } |
| |
| static void calculate_speeds(ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int full = 125, empty = 75; |
| |
| if (jiffies > tape->controlled_pipeline_head_time + 120 * HZ) { |
| tape->controlled_previous_pipeline_head = tape->controlled_last_pipeline_head; |
| tape->controlled_previous_head_time = tape->controlled_pipeline_head_time; |
| tape->controlled_last_pipeline_head = tape->pipeline_head; |
| tape->controlled_pipeline_head_time = jiffies; |
| } |
| if (jiffies > tape->controlled_pipeline_head_time + 60 * HZ) |
| tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_last_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_pipeline_head_time); |
| else if (jiffies > tape->controlled_previous_head_time) |
| tape->controlled_pipeline_head_speed = (tape->pipeline_head - tape->controlled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->controlled_previous_head_time); |
| |
| if (tape->nr_pending_stages < tape->max_stages /*- 1 */) { /* -1 for read mode error recovery */ |
| if (jiffies > tape->uncontrolled_previous_head_time + 10 * HZ) { |
| tape->uncontrolled_pipeline_head_time = jiffies; |
| tape->uncontrolled_pipeline_head_speed = (tape->pipeline_head - tape->uncontrolled_previous_pipeline_head) * 32 * HZ / (jiffies - tape->uncontrolled_previous_head_time); |
| } |
| } else { |
| tape->uncontrolled_previous_head_time = jiffies; |
| tape->uncontrolled_previous_pipeline_head = tape->pipeline_head; |
| if (jiffies > tape->uncontrolled_pipeline_head_time + 30 * HZ) { |
| tape->uncontrolled_pipeline_head_time = jiffies; |
| } |
| } |
| tape->pipeline_head_speed = max(tape->uncontrolled_pipeline_head_speed, tape->controlled_pipeline_head_speed); |
| if (tape->speed_control == 0) { |
| tape->max_insert_speed = 5000; |
| } else if (tape->speed_control == 1) { |
| if (tape->nr_pending_stages >= tape->max_stages / 2) |
| tape->max_insert_speed = tape->pipeline_head_speed + |
| (1100 - tape->pipeline_head_speed) * 2 * (tape->nr_pending_stages - tape->max_stages / 2) / tape->max_stages; |
| else |
| tape->max_insert_speed = 500 + |
| (tape->pipeline_head_speed - 500) * 2 * tape->nr_pending_stages / tape->max_stages; |
| if (tape->nr_pending_stages >= tape->max_stages * 99 / 100) |
| tape->max_insert_speed = 5000; |
| } else if (tape->speed_control == 2) { |
| tape->max_insert_speed = tape->pipeline_head_speed * empty / 100 + |
| (tape->pipeline_head_speed * full / 100 - tape->pipeline_head_speed * empty / 100) * tape->nr_pending_stages / tape->max_stages; |
| } else |
| tape->max_insert_speed = tape->speed_control; |
| tape->max_insert_speed = max(tape->max_insert_speed, 500); |
| } |
| |
| static ide_startstop_t idetape_media_access_finished (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t *pc = tape->pc; |
| idetape_status_reg_t status; |
| |
| if (tape->onstream) |
| printk(KERN_INFO "ide-tape: bug: onstream, media_access_finished\n"); |
| status.all = GET_STAT(); |
| if (status.b.dsc) { |
| if (status.b.check) { /* Error detected */ |
| printk (KERN_ERR "ide-tape: %s: I/O error, ",tape->name); |
| return idetape_retry_pc (drive); /* Retry operation */ |
| } |
| pc->error = 0; |
| if (tape->failed_pc == pc) |
| tape->failed_pc = NULL; |
| } else { |
| pc->error = IDETAPE_ERROR_GENERAL; |
| tape->failed_pc = NULL; |
| } |
| return pc->callback (drive); |
| } |
| |
| static ide_startstop_t idetape_rw_callback (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct request *rq = HWGROUP(drive)->rq; |
| int blocks = tape->pc->actually_transferred / tape->tape_block_size; |
| |
| tape->avg_size += blocks * tape->tape_block_size; |
| tape->insert_size += blocks * tape->tape_block_size; |
| if (tape->insert_size > 1024 * 1024) |
| tape->measure_insert_time = 1; |
| if (tape->measure_insert_time) { |
| tape->measure_insert_time = 0; |
| tape->insert_time = jiffies; |
| tape->insert_size = 0; |
| } |
| if (jiffies > tape->insert_time) |
| tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); |
| if (jiffies - tape->avg_time >= HZ) { |
| tape->avg_speed = tape->avg_size * HZ / (jiffies - tape->avg_time) / 1024; |
| tape->avg_size = 0; |
| tape->avg_time = jiffies; |
| } |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_rw_callback\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| tape->first_frame_position += blocks; |
| rq->current_nr_sectors -= blocks; |
| |
| if (!tape->pc->error) |
| idetape_end_request(drive, 1); |
| else |
| idetape_end_request(drive, tape->pc->error); |
| return ide_stopped; |
| } |
| |
| static void idetape_create_read_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct bio *bio) |
| { |
| struct bio *p = bio; |
| struct bio_vec *bv = bio_iovec(p); |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_READ_CMD; |
| put_unaligned (htonl (length), (unsigned int *) &pc->c[1]); |
| pc->c[1] = 1; |
| pc->callback = &idetape_rw_callback; |
| pc->bio = bio; |
| bv->bv_len = 0; |
| pc->buffer = NULL; |
| if (tape->onstream) { |
| while (p) { |
| bv->bv_len = 0; |
| p = p->bi_next; |
| } |
| } |
| if (!tape->onstream) { |
| pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; |
| if (pc->request_transfer == tape->stage_size) |
| set_bit (PC_DMA_RECOMMENDED, &pc->flags); |
| } else { |
| if (length) { |
| pc->request_transfer = pc->buffer_size = 32768 + 512; |
| set_bit (PC_DMA_RECOMMENDED, &pc->flags); |
| } else |
| pc->request_transfer = 0; |
| } |
| } |
| |
| static void idetape_create_read_buffer_cmd(idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct bio *bio) |
| { |
| int size = 32768; |
| |
| struct bio *p = bio; |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_READ_BUFFER_CMD; |
| pc->c[1] = IDETAPE_RETRIEVE_FAULTY_BLOCK; |
| pc->c[7] = size >> 8; |
| pc->c[8] = size & 0xff; |
| pc->callback = &idetape_pc_callback; |
| pc->bio = bio; |
| atomic_set(&bio->bi_cnt, 0); |
| pc->buffer = NULL; |
| while (p) { |
| p->bi_size = 0; |
| p = p->bi_next; |
| } |
| pc->request_transfer = pc->buffer_size = size; |
| } |
| |
| static void idetape_create_write_cmd (idetape_tape_t *tape, idetape_pc_t *pc, unsigned int length, struct bio *bio) |
| { |
| struct bio *p = bio; |
| struct bio_vec *bv= bio_iovec(p); |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_WRITE_CMD; |
| put_unaligned (htonl (length), (unsigned int *) &pc->c[1]); |
| pc->c[1] = 1; |
| pc->callback = &idetape_rw_callback; |
| set_bit (PC_WRITING, &pc->flags); |
| if (tape->onstream) { |
| while (p) { |
| bv->bv_len = p->bi_size; |
| p = p->bi_next; |
| } |
| } |
| pc->bio = bio; |
| pc->b_data = bio_data(bio); |
| pc->b_count = bio->bi_size; |
| pc->buffer = NULL; |
| if (!tape->onstream) { |
| pc->request_transfer = pc->buffer_size = length * tape->tape_block_size; |
| if (pc->request_transfer == tape->stage_size) |
| set_bit (PC_DMA_RECOMMENDED, &pc->flags); |
| } else { |
| if (length) { |
| pc->request_transfer = pc->buffer_size = 32768 + 512; |
| set_bit (PC_DMA_RECOMMENDED, &pc->flags); |
| } else |
| pc->request_transfer = 0; |
| } |
| } |
| |
| /* |
| * idetape_do_request is our request handling function. |
| */ |
| static ide_startstop_t idetape_do_request (ide_drive_t *drive, struct request *rq, unsigned long block) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t *pc; |
| struct request *postponed_rq = tape->postponed_rq; |
| idetape_status_reg_t status; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 5) |
| /* printk (KERN_INFO "ide-tape: rq_status: %d, rq_dev: %u, cmd: %ld, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->flags,rq->errors); */ |
| if (tape->debug_level >= 2) |
| printk (KERN_INFO "ide-tape: sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| if (!IDETAPE_RQ_CMD (rq->flags)) { |
| /* |
| * We do not support buffer cache originated requests. |
| */ |
| printk (KERN_NOTICE "ide-tape: %s: Unsupported command in request queue (%ld)\n", drive->name, rq->flags); |
| ide_end_request(drive, 0); /* Let the common code handle it */ |
| return ide_stopped; |
| } |
| |
| /* |
| * Retry a failed packet command |
| */ |
| if (tape->failed_pc != NULL && tape->pc->c[0] == IDETAPE_REQUEST_SENSE_CMD) { |
| return idetape_issue_packet_command (drive, tape->failed_pc); |
| } |
| #if IDETAPE_DEBUG_BUGS |
| if (postponed_rq != NULL) |
| if (rq != postponed_rq) { |
| printk (KERN_ERR "ide-tape: ide-tape.c bug - Two DSC requests were queued\n"); |
| idetape_end_request(drive, 0); |
| return ide_stopped; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| |
| tape->postponed_rq = NULL; |
| |
| /* |
| * If the tape is still busy, postpone our request and service |
| * the other device meanwhile. |
| */ |
| status.all = GET_STAT(); |
| |
| /* |
| * The OnStream tape drive doesn't support DSC. Assume |
| * that DSC is always set. |
| */ |
| if (tape->onstream) |
| status.b.dsc = 1; |
| if (!drive->dsc_overlap && rq->flags != IDETAPE_PC_RQ2) |
| set_bit (IDETAPE_IGNORE_DSC, &tape->flags); |
| |
| /* |
| * For the OnStream tape, check the current status of the tape |
| * internal buffer using data gathered from the buffer fill |
| * mode page, and postpone our request, effectively "disconnecting" |
| * from the IDE bus, in case the buffer is full (writing) or |
| * empty (reading), and there is a danger that our request will |
| * hold the IDE bus during actual media access. |
| */ |
| if (tape->tape_still_time > 100 && tape->tape_still_time < 200) |
| tape->measure_insert_time = 1; |
| if (tape->req_buffer_fill && (rq->flags == IDETAPE_WRITE_RQ || rq->flags == IDETAPE_READ_RQ)) { |
| tape->req_buffer_fill = 0; |
| tape->writes_since_buffer_fill = 0; |
| tape->reads_since_buffer_fill = 0; |
| tape->last_buffer_fill = jiffies; |
| idetape_queue_onstream_buffer_fill(drive); |
| if (jiffies > tape->insert_time) |
| tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); |
| return ide_stopped; |
| } |
| if (jiffies > tape->insert_time) |
| tape->insert_speed = tape->insert_size / 1024 * HZ / (jiffies - tape->insert_time); |
| calculate_speeds(drive); |
| if (tape->onstream && tape->max_frames && |
| ((rq->flags == IDETAPE_WRITE_RQ && |
| ( tape->cur_frames == tape->max_frames || |
| ( tape->speed_control && tape->cur_frames > 5 && |
| (tape->insert_speed > tape->max_insert_speed || |
| (0 /* tape->cur_frames > 30 && tape->tape_still_time > 200 */) ) ) ) ) || |
| (rq->flags == IDETAPE_READ_RQ && |
| ( tape->cur_frames == 0 || |
| ( tape->speed_control && (tape->cur_frames < tape->max_frames - 5) && |
| tape->insert_speed > tape->max_insert_speed ) ) && rq->nr_sectors) ) ) { |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk(KERN_INFO "ide-tape: postponing request, cmd %ld, cur %d, max %d\n", |
| rq->flags, tape->cur_frames, tape->max_frames); |
| #endif |
| if (tape->postpone_cnt++ < 500) { |
| status.b.dsc = 0; |
| tape->req_buffer_fill = 1; |
| } |
| #if ONSTREAM_DEBUG |
| else if (tape->debug_level >= 4) |
| printk(KERN_INFO "ide-tape: %s: postpone_cnt %d\n", tape->name, tape->postpone_cnt); |
| #endif |
| } |
| if (!test_and_clear_bit (IDETAPE_IGNORE_DSC, &tape->flags) && !status.b.dsc) { |
| if (postponed_rq == NULL) { |
| tape->dsc_polling_start = jiffies; |
| tape->dsc_polling_frequency = tape->best_dsc_rw_frequency; |
| tape->dsc_timeout = jiffies + IDETAPE_DSC_RW_TIMEOUT; |
| } else if ((signed long) (jiffies - tape->dsc_timeout) > 0) { |
| printk (KERN_ERR "ide-tape: %s: DSC timeout\n", tape->name); |
| if (rq->flags == IDETAPE_PC_RQ2) { |
| idetape_media_access_finished (drive); |
| return ide_stopped; |
| } else { |
| return ide_stopped; |
| } |
| } else if (jiffies - tape->dsc_polling_start > IDETAPE_DSC_MA_THRESHOLD) |
| tape->dsc_polling_frequency = IDETAPE_DSC_MA_SLOW; |
| idetape_postpone_request (drive); |
| return ide_stopped; |
| } |
| switch (rq->flags) { |
| case IDETAPE_READ_RQ: |
| tape->buffer_head++; |
| #if USE_IOTRACE |
| IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); |
| #endif |
| tape->postpone_cnt = 0; |
| tape->reads_since_buffer_fill++; |
| if (tape->onstream) { |
| if (tape->cur_frames - tape->reads_since_buffer_fill <= 0) |
| tape->req_buffer_fill = 1; |
| if (jiffies > tape->last_buffer_fill + 5 * HZ / 100) |
| tape->req_buffer_fill = 1; |
| } |
| pc = idetape_next_pc_storage (drive); |
| idetape_create_read_cmd (tape, pc, rq->current_nr_sectors, rq->bio); |
| break; |
| case IDETAPE_WRITE_RQ: |
| tape->buffer_head++; |
| #if USE_IOTRACE |
| IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); |
| #endif |
| tape->postpone_cnt = 0; |
| tape->writes_since_buffer_fill++; |
| if (tape->onstream) { |
| if (tape->cur_frames + tape->writes_since_buffer_fill >= tape->max_frames) |
| tape->req_buffer_fill = 1; |
| if (jiffies > tape->last_buffer_fill + 5 * HZ / 100) |
| tape->req_buffer_fill = 1; |
| calculate_speeds(drive); |
| } |
| pc = idetape_next_pc_storage (drive); |
| idetape_create_write_cmd (tape, pc, rq->current_nr_sectors, rq->bio); |
| break; |
| case IDETAPE_READ_BUFFER_RQ: |
| tape->postpone_cnt = 0; |
| pc = idetape_next_pc_storage (drive); |
| idetape_create_read_buffer_cmd (tape, pc, rq->current_nr_sectors, rq->bio); |
| break; |
| case IDETAPE_ABORTED_WRITE_RQ: |
| rq->flags = IDETAPE_WRITE_RQ; |
| idetape_end_request(drive, IDETAPE_ERROR_EOD); |
| return ide_stopped; |
| case IDETAPE_ABORTED_READ_RQ: |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: detected aborted read rq\n", tape->name); |
| #endif |
| rq->flags = IDETAPE_READ_RQ; |
| idetape_end_request(drive, IDETAPE_ERROR_EOD); |
| return ide_stopped; |
| case IDETAPE_PC_RQ1: |
| pc = (idetape_pc_t *) rq->buffer; |
| rq->flags = IDETAPE_PC_RQ2; |
| break; |
| case IDETAPE_PC_RQ2: |
| idetape_media_access_finished (drive); |
| return ide_stopped; |
| default: |
| printk (KERN_ERR "ide-tape: bug in IDETAPE_RQ_CMD macro\n"); |
| idetape_end_request(drive, 0); |
| return ide_stopped; |
| } |
| return idetape_issue_packet_command (drive, pc); |
| } |
| |
| /* |
| * Pipeline related functions |
| */ |
| static inline int idetape_pipeline_active (idetape_tape_t *tape) |
| { |
| int rc1, rc2; |
| |
| rc1 = test_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
| rc2 = (tape->active_data_request != NULL); |
| return rc1; |
| } |
| |
| /* |
| * idetape_kmalloc_stage uses __get_free_page to allocate a pipeline |
| * stage, along with all the necessary small buffers which together make |
| * a buffer of size tape->stage_size (or a bit more). We attempt to |
| * combine sequential pages as much as possible. |
| * |
| * Returns a pointer to the new allocated stage, or NULL if we |
| * can't (or don't want to) allocate a stage. |
| * |
| * Pipeline stages are optional and are used to increase performance. |
| * If we can't allocate them, we'll manage without them. |
| */ |
| static idetape_stage_t *__idetape_kmalloc_stage (idetape_tape_t *tape, int full, int clear) |
| { |
| idetape_stage_t *stage; |
| struct bio *prev_bio, *bio; |
| int pages = tape->pages_per_stage; |
| char *b_data = NULL; |
| struct bio_vec *bv; |
| |
| if ((stage = (idetape_stage_t *) kmalloc (sizeof (idetape_stage_t),GFP_KERNEL)) == NULL) |
| return NULL; |
| stage->next = NULL; |
| |
| bio = stage->bio = bio_alloc(GFP_KERNEL,1); |
| bv = bio_iovec(bio); |
| bv->bv_len = 0; |
| if (bio == NULL) |
| goto abort; |
| bio->bi_next = NULL; |
| if ((bio->bi_io_vec[0].bv_page = alloc_page(GFP_KERNEL)) == NULL) |
| goto abort; |
| if (clear) |
| memset(bio_data(bio), 0, PAGE_SIZE); |
| bio->bi_size = PAGE_SIZE; |
| if(bv->bv_len == full) bv->bv_len = bio->bi_size; |
| set_bit (BH_Lock, &bio->bi_flags); |
| |
| while (--pages) { |
| if ((bio->bi_io_vec[pages].bv_page = alloc_page(GFP_KERNEL)) == NULL) |
| goto abort; |
| if (clear) |
| memset(bio_data(bio), 0, PAGE_SIZE); |
| if (bio->bi_size == bv->bv_len + PAGE_SIZE) { |
| bio->bi_size += PAGE_SIZE; |
| bv->bv_len += PAGE_SIZE; |
| bv->bv_offset -= PAGE_SIZE; |
| if (full) |
| bio->bi_size += PAGE_SIZE; |
| continue; |
| } |
| if (b_data == bio_data(bio) + bio->bi_size) { |
| bio->bi_size += PAGE_SIZE; |
| if (full) |
| bio->bi_size += PAGE_SIZE; |
| continue; |
| } |
| prev_bio = bio; |
| if ((bio = bio_alloc(GFP_KERNEL,1)) == NULL) { |
| free_page ((unsigned long) bio_data(bio)); |
| goto abort; |
| } |
| bio->bi_next = NULL; |
| //bio->bi_io_vec[0].bv_offset = b_data; |
| bio->bi_size = PAGE_SIZE; |
| atomic_set(&bio->bi_cnt, full ? bio->bi_size : 0); |
| set_bit (BH_Lock, &bio->bi_flags); |
| prev_bio->bi_next = bio; |
| } |
| bio->bi_size -= tape->excess_bh_size; |
| if (full) |
| atomic_sub(tape->excess_bh_size, &bio->bi_cnt); |
| if (tape->onstream) |
| stage->aux = (os_aux_t *) (bio_data(bio) + bio->bi_size - OS_AUX_SIZE); |
| return stage; |
| abort: |
| __idetape_kfree_stage (stage); |
| return NULL; |
| } |
| |
| static idetape_stage_t *idetape_kmalloc_stage (idetape_tape_t *tape) |
| { |
| idetape_stage_t *cache_stage = tape->cache_stage; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_kmalloc_stage\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| if (tape->nr_stages >= tape->max_stages) |
| return NULL; |
| if (cache_stage != NULL) { |
| tape->cache_stage = NULL; |
| return cache_stage; |
| } |
| return __idetape_kmalloc_stage (tape, 0, 0); |
| } |
| |
| static void idetape_copy_stage_from_user (idetape_tape_t *tape, idetape_stage_t *stage, const char *buf, int n) |
| { |
| struct bio *bio = tape->bio; |
| int count; |
| |
| while (n) { |
| #if IDETAPE_DEBUG_BUGS |
| if (bio == NULL) { |
| printk (KERN_ERR "ide-tape: bio == NULL in idetape_copy_stage_from_user\n"); |
| return; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| count = min(bio->bi_size - tape->b_count, n); |
| copy_from_user (bio_data(bio) + tape->b_count, buf, count); |
| n -= count; |
| bio->bi_size += count; |
| buf += count; |
| if (tape->b_count == bio->bi_size) { |
| bio = bio->bi_next; |
| if (bio) |
| tape->b_count = 0; |
| } |
| } |
| tape->bio = bio; |
| } |
| |
| static void idetape_copy_stage_to_user (idetape_tape_t *tape, char *buf, idetape_stage_t *stage, int n) |
| { |
| struct bio *bio = tape->bio; |
| int count; |
| |
| while (n) { |
| #if IDETAPE_DEBUG_BUGS |
| if (bio == NULL) { |
| printk (KERN_ERR "ide-tape: bio == NULL in idetape_copy_stage_to_user\n"); |
| return; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| count = min(tape->b_count, n); |
| copy_to_user (buf, tape->b_data, count); |
| n -= count; |
| tape->b_data += count; |
| tape->b_count -= count; |
| buf += count; |
| if (!tape->b_count) { |
| tape->bio = bio = bio->bi_next; |
| if (bio) { |
| tape->b_data = bio_data(bio); |
| tape->b_count = bio->bi_size; |
| } |
| } |
| } |
| } |
| |
| static void idetape_init_merge_stage (idetape_tape_t *tape) |
| { |
| struct bio *bio = tape->merge_stage->bio; |
| |
| tape->bio = bio; |
| if (tape->chrdev_direction == idetape_direction_write) |
| atomic_set(&bio->bi_cnt, 0); |
| else { |
| tape->b_data = bio_data(bio); |
| tape->b_count = atomic_read(&bio->bi_cnt); |
| } |
| } |
| |
| static void idetape_switch_buffers (idetape_tape_t *tape, idetape_stage_t *stage) |
| { |
| struct bio *tmp; |
| os_aux_t *tmp_aux; |
| |
| tmp = stage->bio; tmp_aux = stage->aux; |
| stage->bio = tape->merge_stage->bio; stage->aux = tape->merge_stage->aux; |
| tape->merge_stage->bio = tmp; tape->merge_stage->aux = tmp_aux; |
| idetape_init_merge_stage (tape); |
| } |
| |
| /* |
| * idetape_add_stage_tail adds a new stage at the end of the pipeline. |
| */ |
| static void idetape_add_stage_tail (ide_drive_t *drive,idetape_stage_t *stage) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned long flags; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_add_stage_tail\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| spin_lock_irqsave(&tape->spinlock, flags); |
| stage->next=NULL; |
| if (tape->last_stage != NULL) |
| tape->last_stage->next=stage; |
| else |
| tape->first_stage = tape->next_stage=stage; |
| tape->last_stage = stage; |
| if (tape->next_stage == NULL) |
| tape->next_stage = tape->last_stage; |
| tape->nr_stages++; |
| tape->nr_pending_stages++; |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| |
| /* |
| * Initialize the OnStream AUX |
| */ |
| static void idetape_init_stage (ide_drive_t *drive, idetape_stage_t *stage, int frame_type, int logical_blk_num) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| os_aux_t *aux = stage->aux; |
| os_partition_t *par = &aux->partition; |
| os_dat_t *dat = &aux->dat; |
| |
| if (!tape->onstream || tape->raw) |
| return; |
| memset(aux, 0, sizeof(*aux)); |
| aux->format_id = htonl(0); |
| memcpy(aux->application_sig, "LIN3", 4); |
| aux->hdwr = htonl(0); |
| aux->frame_type = frame_type; |
| |
| if (frame_type == OS_FRAME_TYPE_HEADER) { |
| aux->update_frame_cntr = htonl(tape->update_frame_cntr); |
| par->partition_num = OS_CONFIG_PARTITION; |
| par->par_desc_ver = OS_PARTITION_VERSION; |
| par->wrt_pass_cntr = htons(0xffff); |
| par->first_frame_addr = htonl(0); |
| par->last_frame_addr = htonl(0xbb7); /* 2999 */ |
| aux->frame_seq_num = htonl(0); |
| aux->logical_blk_num_high = htonl(0); |
| aux->logical_blk_num = htonl(0); |
| aux->next_mark_addr = htonl(tape->first_mark_addr); |
| } else { |
| aux->update_frame_cntr = htonl(0); |
| par->partition_num = OS_DATA_PARTITION; |
| par->par_desc_ver = OS_PARTITION_VERSION; |
| par->wrt_pass_cntr = htons(tape->wrt_pass_cntr); |
| par->first_frame_addr = htonl(OS_DATA_STARTFRAME1); |
| par->last_frame_addr = htonl(tape->capacity); |
| aux->frame_seq_num = htonl(logical_blk_num); |
| aux->logical_blk_num_high = htonl(0); |
| aux->logical_blk_num = htonl(logical_blk_num); |
| dat->dat_sz = 8; |
| dat->reserved1 = 0; |
| dat->entry_cnt = 1; |
| dat->reserved3 = 0; |
| if (frame_type == OS_FRAME_TYPE_DATA) |
| dat->dat_list[0].blk_sz = htonl(32 * 1024); |
| else |
| dat->dat_list[0].blk_sz = 0; |
| dat->dat_list[0].blk_cnt = htons(1); |
| if (frame_type == OS_FRAME_TYPE_MARKER) |
| dat->dat_list[0].flags = OS_DAT_FLAGS_MARK; |
| else |
| dat->dat_list[0].flags = OS_DAT_FLAGS_DATA; |
| dat->dat_list[0].reserved = 0; |
| } |
| aux->filemark_cnt = ntohl(tape->filemark_cnt); /* shouldn't this be htonl ?? */ |
| aux->phys_fm = ntohl(0xffffffff); /* shouldn't this be htonl ?? */ |
| aux->last_mark_addr = ntohl(tape->last_mark_addr); /* shouldn't this be htonl ?? */ |
| } |
| |
| /* |
| * idetape_wait_for_request installs a completion in a pending request |
| * and sleeps until it is serviced. |
| * |
| * The caller should ensure that the request will not be serviced |
| * before we install the completion (usually by disabling interrupts). |
| */ |
| static void idetape_wait_for_request (ide_drive_t *drive, struct request *rq) |
| { |
| DECLARE_COMPLETION(wait); |
| idetape_tape_t *tape = drive->driver_data; |
| |
| #if IDETAPE_DEBUG_BUGS |
| if (rq == NULL || !IDETAPE_RQ_CMD (rq->flags)) { |
| printk (KERN_ERR "ide-tape: bug: Trying to sleep on non-valid request\n"); |
| return; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| rq->waiting = &wait; |
| tape->waiting = &wait; |
| spin_unlock(&tape->spinlock); |
| wait_for_completion(&wait); |
| rq->waiting = NULL; |
| tape->waiting = NULL; |
| spin_lock_irq(&tape->spinlock); |
| } |
| |
| static ide_startstop_t idetape_read_position_callback (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_read_position_result_t *result; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_read_position_callback\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| if (!tape->pc->error) { |
| result = (idetape_read_position_result_t *) tape->pc->buffer; |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk (KERN_INFO "ide-tape: BOP - %s\n",result->bop ? "Yes":"No"); |
| if (tape->debug_level >= 2) |
| printk (KERN_INFO "ide-tape: EOP - %s\n",result->eop ? "Yes":"No"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| if (result->bpu) { |
| printk (KERN_INFO "ide-tape: Block location is unknown to the tape\n"); |
| clear_bit (IDETAPE_ADDRESS_VALID, &tape->flags); |
| idetape_end_request(drive, 0); |
| } else { |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk (KERN_INFO "ide-tape: Block Location - %u\n", ntohl (result->first_block)); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| tape->partition = result->partition; |
| tape->first_frame_position = ntohl (result->first_block); |
| tape->last_frame_position = ntohl (result->last_block); |
| tape->blocks_in_buffer = result->blocks_in_buffer[2]; |
| set_bit (IDETAPE_ADDRESS_VALID, &tape->flags); |
| idetape_end_request(drive, 1); |
| } |
| } else { |
| idetape_end_request(drive, 0); |
| } |
| return ide_stopped; |
| } |
| |
| /* |
| * idetape_create_write_filemark_cmd will: |
| * |
| * 1. Write a filemark if write_filemark=1. |
| * 2. Flush the device buffers without writing a filemark |
| * if write_filemark=0. |
| * |
| */ |
| static void idetape_create_write_filemark_cmd (ide_drive_t *drive, idetape_pc_t *pc,int write_filemark) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_WRITE_FILEMARK_CMD; |
| if (tape->onstream) |
| pc->c[1] = 1; /* Immed bit */ |
| pc->c[4] = write_filemark; /* not used for OnStream ?? */ |
| set_bit (PC_WAIT_FOR_DSC, &pc->flags); |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_test_unit_ready_cmd(idetape_pc_t *pc) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = IDETAPE_TEST_UNIT_READY_CMD; |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| /* |
| * idetape_queue_pc_tail is based on the following functions: |
| * |
| * ide_do_drive_cmd from ide.c |
| * cdrom_queue_request and cdrom_queue_packet_command from ide-cd.c |
| * |
| * We add a special packet command request to the tail of the request queue, |
| * and wait for it to be serviced. |
| * |
| * This is not to be called from within the request handling part |
| * of the driver ! We allocate here data in the stack, and it is valid |
| * until the request is finished. This is not the case for the bottom |
| * part of the driver, where we are always leaving the functions to wait |
| * for an interrupt or a timer event. |
| * |
| * From the bottom part of the driver, we should allocate safe memory |
| * using idetape_next_pc_storage and idetape_next_rq_storage, and add |
| * the request to the request list without waiting for it to be serviced ! |
| * In that case, we usually use idetape_queue_pc_head. |
| */ |
| static int __idetape_queue_pc_tail (ide_drive_t *drive, idetape_pc_t *pc) |
| { |
| struct request rq; |
| |
| ide_init_drive_cmd (&rq); |
| rq.buffer = (char *) pc; |
| rq.flags = IDETAPE_PC_RQ1; |
| return ide_do_drive_cmd (drive, &rq, ide_wait); |
| } |
| |
| static void idetape_create_load_unload_cmd (ide_drive_t *drive, idetape_pc_t *pc,int cmd) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_LOAD_UNLOAD_CMD; |
| pc->c[4] = cmd; |
| if (tape->onstream) { |
| pc->c[1] = 1; |
| if (cmd == !IDETAPE_LU_LOAD_MASK) |
| pc->c[4] = 4; |
| } |
| set_bit (PC_WAIT_FOR_DSC, &pc->flags); |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| static int idetape_wait_ready (ide_drive_t *drive, unsigned long long timeout) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t pc; |
| |
| /* |
| * Wait for the tape to become ready |
| */ |
| timeout += jiffies; |
| while (jiffies < timeout) { |
| idetape_create_test_unit_ready_cmd(&pc); |
| if (!__idetape_queue_pc_tail(drive, &pc)) |
| return 0; |
| if (tape->sense_key == 2 && tape->asc == 4 && tape->ascq == 2) { |
| idetape_create_load_unload_cmd (drive, &pc, IDETAPE_LU_LOAD_MASK); |
| __idetape_queue_pc_tail(drive, &pc); |
| idetape_create_test_unit_ready_cmd(&pc); |
| if (!__idetape_queue_pc_tail(drive, &pc)) |
| return 0; |
| } |
| if (!(tape->sense_key == 2 && tape->asc == 4 && (tape->ascq == 1 || tape->ascq == 8))) |
| break; |
| current->state = TASK_INTERRUPTIBLE; |
| schedule_timeout(HZ / 10); |
| } |
| return -EIO; |
| } |
| |
| static int idetape_queue_pc_tail (ide_drive_t *drive,idetape_pc_t *pc) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int rc; |
| |
| rc = __idetape_queue_pc_tail(drive, pc); |
| if (rc) |
| return rc; |
| if (tape->onstream && test_bit(PC_WAIT_FOR_DSC, &pc->flags)) |
| rc = idetape_wait_ready(drive, 60 * 10 * HZ); /* AJN-4: Changed from 5 to 10 minutes; |
| because retension takes approx. 8:20 with Onstream 30GB tape */ |
| return rc; |
| } |
| |
| static int idetape_flush_tape_buffers (ide_drive_t *drive) |
| { |
| idetape_pc_t pc; |
| int rc; |
| |
| idetape_create_write_filemark_cmd(drive, &pc, 0); |
| if ((rc = idetape_queue_pc_tail (drive, &pc))) |
| return rc; |
| idetape_wait_ready(drive, 60 * 5 * HZ); |
| return 0; |
| } |
| |
| static void idetape_create_read_position_cmd (idetape_pc_t *pc) |
| { |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_READ_POSITION_CMD; |
| pc->request_transfer = 20; |
| pc->callback = &idetape_read_position_callback; |
| } |
| |
| static int idetape_read_position (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t pc; |
| int position; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_read_position\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| #ifdef NO_LONGER_REQUIRED |
| idetape_flush_tape_buffers(drive); |
| #endif |
| idetape_create_read_position_cmd(&pc); |
| if (idetape_queue_pc_tail (drive, &pc)) |
| return -1; |
| position = tape->first_frame_position; |
| #ifdef NO_LONGER_REQUIRED |
| if (tape->onstream) { |
| if ((position != tape->last_frame_position - tape->blocks_in_buffer) && |
| (position != tape->last_frame_position + tape->blocks_in_buffer)) { |
| if (tape->blocks_in_buffer == 0) { |
| printk("ide-tape: %s: correcting read position %d, %d, %d\n", tape->name, position, tape->last_frame_position, tape->blocks_in_buffer); |
| position = tape->last_frame_position; |
| tape->first_frame_position = position; |
| } |
| } |
| } |
| #endif |
| return position; |
| } |
| |
| static void idetape_create_locate_cmd (ide_drive_t *drive, idetape_pc_t *pc, unsigned int block, byte partition, int skip) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_LOCATE_CMD; |
| if (tape->onstream) |
| pc->c[1] = 1; /* Immediate bit */ |
| else |
| pc->c[1] = 2; |
| put_unaligned (htonl (block), (unsigned int *) &pc->c[3]); |
| pc->c[8] = partition; |
| if (tape->onstream) |
| /* |
| * Set SKIP bit. |
| * In case of write error this will write buffered |
| * data in the drive to this new position! |
| */ |
| pc->c[9] = skip << 7; |
| set_bit (PC_WAIT_FOR_DSC, &pc->flags); |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int prevent) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| if (!tape->capabilities.lock) |
| return 0; |
| |
| idetape_init_pc(pc); |
| pc->c[0] = IDETAPE_PREVENT_CMD; |
| pc->c[4] = prevent; |
| pc->callback = &idetape_pc_callback; |
| return 1; |
| } |
| |
| static int __idetape_discard_read_pipeline (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned long flags; |
| int cnt; |
| |
| if (tape->chrdev_direction != idetape_direction_read) |
| return 0; |
| tape->merge_stage_size = 0; |
| if (tape->merge_stage != NULL) { |
| __idetape_kfree_stage (tape->merge_stage); |
| tape->merge_stage = NULL; |
| } |
| tape->chrdev_direction = idetape_direction_none; |
| |
| if (tape->first_stage == NULL) |
| return 0; |
| |
| spin_lock_irqsave(&tape->spinlock, flags); |
| tape->next_stage = NULL; |
| if (idetape_pipeline_active (tape)) |
| idetape_wait_for_request(drive, tape->active_data_request); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| |
| cnt = tape->nr_stages - tape->nr_pending_stages; |
| while (tape->first_stage != NULL) |
| idetape_remove_stage_head (drive); |
| tape->nr_pending_stages = 0; |
| tape->max_stages = tape->min_pipeline; |
| return cnt; |
| } |
| |
| /* |
| * idetape_position_tape positions the tape to the requested block |
| * using the LOCATE packet command. A READ POSITION command is then |
| * issued to check where we are positioned. |
| * |
| * Like all higher level operations, we queue the commands at the tail |
| * of the request queue and wait for their completion. |
| * |
| */ |
| static int idetape_position_tape (ide_drive_t *drive, unsigned int block, byte partition, int skip) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int retval; |
| idetape_pc_t pc; |
| |
| if (tape->chrdev_direction == idetape_direction_read) |
| __idetape_discard_read_pipeline(drive); |
| idetape_wait_ready(drive, 60 * 5 * HZ); |
| idetape_create_locate_cmd (drive, &pc, block, partition, skip); |
| retval = idetape_queue_pc_tail (drive, &pc); |
| if (retval) |
| return (retval); |
| |
| idetape_create_read_position_cmd (&pc); |
| return (idetape_queue_pc_tail (drive, &pc)); |
| } |
| |
| static void idetape_discard_read_pipeline (ide_drive_t *drive, int restore_position) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int cnt; |
| int seek, position; |
| |
| cnt = __idetape_discard_read_pipeline(drive); |
| if (restore_position) { |
| position = idetape_read_position(drive); |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: address %u, nr_stages %d\n", position, cnt); |
| #endif |
| seek = position > cnt ? position - cnt : 0; |
| if (idetape_position_tape(drive, seek, 0, 0)) { |
| printk(KERN_INFO "ide-tape: %s: position_tape failed in discard_pipeline()\n", tape->name); |
| return; |
| } |
| } |
| } |
| |
| static void idetape_update_stats (ide_drive_t *drive) |
| { |
| idetape_pc_t pc; |
| |
| idetape_create_mode_sense_cmd (&pc, IDETAPE_BUFFER_FILLING_PAGE); |
| pc.callback = idetape_onstream_buffer_fill_callback; |
| (void) idetape_queue_pc_tail(drive, &pc); |
| } |
| |
| /* |
| * idetape_queue_rw_tail generates a read/write request for the block |
| * device interface and wait for it to be serviced. |
| */ |
| static int idetape_queue_rw_tail (ide_drive_t *drive, int cmd, int blocks, struct bio *bio) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct request rq; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk (KERN_INFO "ide-tape: idetape_queue_rw_tail: cmd=%d\n",cmd); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| #if IDETAPE_DEBUG_BUGS |
| if (idetape_pipeline_active (tape)) { |
| printk (KERN_ERR "ide-tape: bug: the pipeline is active in idetape_queue_rw_tail\n"); |
| return (0); |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| |
| ide_init_drive_cmd (&rq); |
| rq.bio = bio; |
| rq.flags = cmd; |
| rq.sector = tape->first_frame_position; |
| rq.nr_sectors = rq.current_nr_sectors = blocks; |
| if (tape->onstream) |
| tape->postpone_cnt = 600; |
| (void) ide_do_drive_cmd (drive, &rq, ide_wait); |
| |
| if (cmd != IDETAPE_READ_RQ && cmd != IDETAPE_WRITE_RQ) |
| return 0; |
| |
| if (tape->merge_stage) |
| idetape_init_merge_stage (tape); |
| if (rq.errors == IDETAPE_ERROR_GENERAL) |
| return -EIO; |
| return (tape->tape_block_size * (blocks-rq.current_nr_sectors)); |
| } |
| |
| /* |
| * Read back the drive's internal buffer contents, as a part |
| * of the write error recovery mechanism for old OnStream |
| * firmware revisions. |
| */ |
| static void idetape_onstream_read_back_buffer (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int frames, i, logical_blk_num; |
| idetape_stage_t *stage, *first = NULL, *last = NULL; |
| os_aux_t *aux; |
| struct request *rq; |
| unsigned char *p; |
| unsigned long flags; |
| |
| idetape_update_stats(drive); |
| frames = tape->cur_frames; |
| logical_blk_num = ntohl(tape->first_stage->aux->logical_blk_num) - frames; |
| printk(KERN_INFO "ide-tape: %s: reading back %d frames from the drive's internal buffer\n", tape->name, frames); |
| for (i = 0; i < frames; i++) { |
| stage = __idetape_kmalloc_stage(tape, 0, 0); |
| if (!first) |
| first = stage; |
| aux = stage->aux; |
| p = bio_data(stage->bio); |
| idetape_queue_rw_tail(drive, IDETAPE_READ_BUFFER_RQ, tape->capabilities.ctl, stage->bio); |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: read back logical block %d, data %x %x %x %x\n", tape->name, logical_blk_num, *p++, *p++, *p++, *p++); |
| #endif |
| rq = &stage->rq; |
| ide_init_drive_cmd (rq); |
| rq->flags = IDETAPE_WRITE_RQ; |
| rq->sector = tape->first_frame_position; |
| rq->nr_sectors = rq->current_nr_sectors = tape->capabilities.ctl; |
| idetape_init_stage(drive, stage, OS_FRAME_TYPE_DATA, logical_blk_num++); |
| stage->next = NULL; |
| if (last) |
| last->next = stage; |
| last = stage; |
| } |
| if (frames) { |
| spin_lock_irqsave(&tape->spinlock, flags); |
| last->next = tape->first_stage; |
| tape->next_stage = tape->first_stage = first; |
| tape->nr_stages += frames; |
| tape->nr_pending_stages += frames; |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| idetape_update_stats(drive); |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: frames left in buffer: %d\n", tape->name, tape->cur_frames); |
| #endif |
| } |
| |
| /* |
| * Error recovery algorithm for the OnStream tape. |
| */ |
| static void idetape_onstream_write_error_recovery (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned int block; |
| |
| if (tape->onstream_write_error == OS_WRITE_ERROR) { |
| printk(KERN_ERR "ide-tape: %s: onstream_write_error_recovery: detected physical bad block at %u, logical %u first frame %u last_frame %u bufblocks %u stages %u skipping %u frames\n", |
| tape->name, ntohl(tape->sense.information), tape->logical_blk_num, |
| tape->first_frame_position, tape->last_frame_position, |
| tape->blocks_in_buffer, tape->nr_stages, |
| (ntohl(tape->sense.command_specific) >> 16) & 0xff ); |
| block = ntohl(tape->sense.information) + ((ntohl(tape->sense.command_specific) >> 16) & 0xff); |
| idetape_update_stats(drive); |
| printk(KERN_ERR "ide-tape: %s: relocating %d buffered logical blocks to physical block %u\n", tape->name, tape->cur_frames, block); |
| #if 0 /* isn't once enough ??? MM */ |
| idetape_update_stats(drive); |
| #endif |
| if (tape->firmware_revision_num >= 106) |
| idetape_position_tape(drive, block, 0, 1); |
| else { |
| idetape_onstream_read_back_buffer(drive); |
| idetape_position_tape(drive, block, 0, 0); |
| } |
| #if 0 /* already done in idetape_position_tape MM */ |
| idetape_read_position(drive); |
| #endif |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 1) |
| printk(KERN_ERR "ide-tape: %s: positioning complete, cur_frames %d, pos %d, tape pos %d\n", tape->name, tape->cur_frames, tape->first_frame_position, tape->last_frame_position); |
| #endif |
| } else if (tape->onstream_write_error == OS_PART_ERROR) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 1) |
| printk(KERN_INFO "ide-tape: %s: skipping over config partition\n", tape->name); |
| #endif |
| idetape_flush_tape_buffers(drive); |
| block = idetape_read_position(drive); |
| if (block != OS_DATA_ENDFRAME1) |
| printk(KERN_ERR "ide-tape: warning, current position %d, expected %d\n", block, OS_DATA_ENDFRAME1); |
| idetape_position_tape(drive, 0xbb8, 0, 0); /* 3000 */ |
| } |
| tape->onstream_write_error = 0; |
| } |
| |
| /* |
| * idetape_insert_pipeline_into_queue is used to start servicing the |
| * pipeline stages, starting from tape->next_stage. |
| */ |
| static void idetape_insert_pipeline_into_queue (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| if (tape->next_stage == NULL) |
| return; |
| if (!idetape_pipeline_active (tape)) { |
| if (tape->onstream_write_error) |
| idetape_onstream_write_error_recovery(drive); |
| set_bit(IDETAPE_PIPELINE_ACTIVE, &tape->flags); |
| idetape_active_next_stage (drive); |
| (void) ide_do_drive_cmd (drive, tape->active_data_request, ide_end); |
| } |
| } |
| |
| static void idetape_create_inquiry_cmd (idetape_pc_t *pc) |
| { |
| idetape_init_pc(pc); |
| pc->c[0] = IDETAPE_INQUIRY_CMD; |
| pc->c[4] = pc->request_transfer = 254; |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_rewind_cmd (ide_drive_t *drive, idetape_pc_t *pc) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_REWIND_CMD; |
| if (tape->onstream) |
| pc->c[1] = 1; |
| set_bit (PC_WAIT_FOR_DSC, &pc->flags); |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_mode_select_cmd (idetape_pc_t *pc, int length) |
| { |
| idetape_init_pc (pc); |
| set_bit (PC_WRITING, &pc->flags); |
| pc->c[0] = IDETAPE_MODE_SELECT_CMD; |
| pc->c[1] = 0x10; |
| put_unaligned (htons(length), (unsigned short *) &pc->c[3]); |
| pc->request_transfer = 255; |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_erase_cmd (idetape_pc_t *pc) |
| { |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_ERASE_CMD; |
| pc->c[1] = 1; |
| set_bit (PC_WAIT_FOR_DSC, &pc->flags); |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| static void idetape_create_space_cmd (idetape_pc_t *pc,int count,byte cmd) |
| { |
| idetape_init_pc (pc); |
| pc->c[0] = IDETAPE_SPACE_CMD; |
| put_unaligned (htonl (count), (unsigned int *) &pc->c[1]); |
| pc->c[1] = cmd; |
| set_bit (PC_WAIT_FOR_DSC, &pc->flags); |
| pc->callback = &idetape_pc_callback; |
| } |
| |
| /* |
| * Verify that we have the correct tape frame |
| */ |
| static int idetape_verify_stage (ide_drive_t *drive, idetape_stage_t *stage, int logical_blk_num, int quiet) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| os_aux_t *aux = stage->aux; |
| os_partition_t *par = &aux->partition; |
| struct request *rq = &stage->rq; |
| struct bio *bio; |
| |
| if (!tape->onstream) |
| return 1; |
| if (tape->raw) { |
| if (rq->errors) { |
| bio = stage->bio; |
| while (bio) { |
| memset(bio_data(bio), 0, bio->bi_size); |
| bio = bio->bi_next; |
| } |
| strcpy(bio_data(stage->bio), "READ ERROR ON FRAME"); |
| } |
| return 1; |
| } |
| if (rq->errors == IDETAPE_ERROR_GENERAL) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, read error\n", tape->name, tape->first_frame_position); |
| return 0; |
| } |
| if (rq->errors == IDETAPE_ERROR_EOD) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, eod\n", tape->name, tape->first_frame_position); |
| return 0; |
| } |
| if (ntohl(aux->format_id) != 0) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, format_id %u\n", tape->name, tape->first_frame_position, ntohl(aux->format_id)); |
| return 0; |
| } |
| if (memcmp(aux->application_sig, tape->application_sig, 4) != 0) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, incorrect application signature\n", tape->name, tape->first_frame_position); |
| return 0; |
| } |
| if (aux->frame_type != OS_FRAME_TYPE_DATA && |
| aux->frame_type != OS_FRAME_TYPE_EOD && |
| aux->frame_type != OS_FRAME_TYPE_MARKER) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, frame type %x\n", tape->name, tape->first_frame_position, aux->frame_type); |
| return 0; |
| } |
| if (par->partition_num != OS_DATA_PARTITION) { |
| if (!tape->linux_media || tape->linux_media_version != 2) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, partition num %d\n", tape->name, tape->first_frame_position, par->partition_num); |
| return 0; |
| } |
| } |
| if (par->par_desc_ver != OS_PARTITION_VERSION) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, partition version %d\n", tape->name, tape->first_frame_position, par->par_desc_ver); |
| return 0; |
| } |
| if (ntohs(par->wrt_pass_cntr) != tape->wrt_pass_cntr) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, wrt_pass_cntr %d (expected %d)(logical_blk_num %u)\n", tape->name, tape->first_frame_position, ntohs(par->wrt_pass_cntr), tape->wrt_pass_cntr, ntohl(aux->logical_blk_num)); |
| return 0; |
| } |
| if (aux->frame_seq_num != aux->logical_blk_num) { |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, seq != logical\n", tape->name, tape->first_frame_position); |
| return 0; |
| } |
| if (logical_blk_num != -1 && ntohl(aux->logical_blk_num) != logical_blk_num) { |
| if (!quiet) |
| printk(KERN_INFO "ide-tape: %s: skipping frame %d, logical_blk_num %u (expected %d)\n", tape->name, tape->first_frame_position, ntohl(aux->logical_blk_num), logical_blk_num); |
| return 0; |
| } |
| if (aux->frame_type == OS_FRAME_TYPE_MARKER) { |
| rq->errors = IDETAPE_ERROR_FILEMARK; |
| rq->current_nr_sectors = rq->nr_sectors; |
| } |
| return 1; |
| } |
| |
| static void idetape_wait_first_stage (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned long flags; |
| |
| if (tape->first_stage == NULL) |
| return; |
| spin_lock_irqsave(&tape->spinlock, flags); |
| if (tape->active_stage == tape->first_stage) |
| idetape_wait_for_request(drive, tape->active_data_request); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| |
| /* |
| * idetape_add_chrdev_write_request tries to add a character device |
| * originated write request to our pipeline. In case we don't succeed, |
| * we revert to non-pipelined operation mode for this request. |
| * |
| * 1. Try to allocate a new pipeline stage. |
| * 2. If we can't, wait for more and more requests to be serviced |
| * and try again each time. |
| * 3. If we still can't allocate a stage, fallback to |
| * non-pipelined operation mode for this request. |
| */ |
| static int idetape_add_chrdev_write_request (ide_drive_t *drive, int blocks) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *new_stage; |
| unsigned long flags; |
| struct request *rq; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 3) |
| printk (KERN_INFO "ide-tape: Reached idetape_add_chrdev_write_request\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| /* |
| * Attempt to allocate a new stage. |
| * Pay special attention to possible race conditions. |
| */ |
| while ((new_stage = idetape_kmalloc_stage (tape)) == NULL) { |
| spin_lock_irqsave(&tape->spinlock, flags); |
| if (idetape_pipeline_active (tape)) { |
| idetape_wait_for_request(drive, tape->active_data_request); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } else { |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| idetape_insert_pipeline_into_queue (drive); |
| if (idetape_pipeline_active (tape)) |
| continue; |
| /* |
| * Linux is short on memory. Fallback to |
| * non-pipelined operation mode for this request. |
| */ |
| return idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bio); |
| } |
| } |
| rq = &new_stage->rq; |
| ide_init_drive_cmd (rq); |
| rq->flags = IDETAPE_WRITE_RQ; |
| rq->sector = tape->first_frame_position; /* Doesn't actually matter - We always assume sequential access */ |
| rq->nr_sectors = rq->current_nr_sectors = blocks; |
| |
| idetape_switch_buffers (tape, new_stage); |
| idetape_init_stage(drive, new_stage, OS_FRAME_TYPE_DATA, tape->logical_blk_num); |
| tape->logical_blk_num++; |
| idetape_add_stage_tail (drive, new_stage); |
| tape->pipeline_head++; |
| #if USE_IOTRACE |
| IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); |
| #endif |
| calculate_speeds(drive); |
| |
| /* |
| * Estimate whether the tape has stopped writing by checking |
| * if our write pipeline is currently empty. If we are not |
| * writing anymore, wait for the pipeline to be full enough |
| * (90%) before starting to service requests, so that we will |
| * be able to keep up with the higher speeds of the tape. |
| * |
| * For the OnStream drive, we can query the number of pending |
| * frames in the drive's internal buffer. As long as the tape |
| * is still writing, it is better to write frames immediately |
| * rather than gather them in the pipeline. This will give the |
| * tape's firmware the ability to sense the current incoming |
| * data rate more accurately, and since the OnStream tape |
| * supports variable speeds, it can try to adjust itself to the |
| * incoming data rate. |
| */ |
| if (!idetape_pipeline_active(tape)) { |
| if (tape->nr_stages >= tape->max_stages * 9 / 10 || |
| tape->nr_stages >= tape->max_stages - tape->uncontrolled_pipeline_head_speed * 3 * 1024 / tape->tape_block_size) { |
| tape->measure_insert_time = 1; |
| tape->insert_time = jiffies; |
| tape->insert_size = 0; |
| tape->insert_speed = 0; |
| idetape_insert_pipeline_into_queue (drive); |
| } else if (tape->onstream) { |
| idetape_update_stats(drive); |
| if (tape->cur_frames > 5) |
| idetape_insert_pipeline_into_queue (drive); |
| } |
| } |
| if (test_and_clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags)) /* Return a deferred error */ |
| return -EIO; |
| return blocks; |
| } |
| |
| /* |
| * idetape_wait_for_pipeline will wait until all pending pipeline |
| * requests are serviced. Typically called on device close. |
| */ |
| static void idetape_wait_for_pipeline (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned long flags; |
| |
| while (tape->next_stage || idetape_pipeline_active(tape)) { |
| idetape_insert_pipeline_into_queue (drive); |
| spin_lock_irqsave(&tape->spinlock, flags); |
| if (idetape_pipeline_active(tape)) |
| idetape_wait_for_request(drive, tape->active_data_request); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| } |
| |
| static void idetape_empty_write_pipeline (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int blocks, i, min; |
| struct bio *bio; |
| |
| #if IDETAPE_DEBUG_BUGS |
| if (tape->chrdev_direction != idetape_direction_write) { |
| printk (KERN_ERR "ide-tape: bug: Trying to empty write pipeline, but we are not writing.\n"); |
| return; |
| } |
| if (tape->merge_stage_size > tape->stage_size) { |
| printk (KERN_ERR "ide-tape: bug: merge_buffer too big\n"); |
| tape->merge_stage_size = tape->stage_size; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| if (tape->merge_stage_size) { |
| blocks = tape->merge_stage_size / tape->tape_block_size; |
| if (tape->merge_stage_size % tape->tape_block_size) { |
| blocks++; |
| i = tape->tape_block_size - tape->merge_stage_size % tape->tape_block_size; |
| bio = tape->bio->bi_next; |
| while (bio) { |
| atomic_set(&bio->bi_cnt, 0); |
| bio = bio->bi_next; |
| } |
| bio = tape->bio; |
| while (i) { |
| if (bio == NULL) { |
| printk(KERN_INFO "ide-tape: bug, bio NULL\n"); |
| break; |
| } |
| min = min(i, bio->bi_size - atomic_read(&bio->bi_cnt)); |
| memset(bio_data(bio) + bio->bi_size, 0, min); |
| atomic_add(min, &bio->bi_cnt); |
| i -= min; |
| bio = bio->bi_next; |
| } |
| } |
| (void) idetape_add_chrdev_write_request (drive, blocks); |
| tape->merge_stage_size = 0; |
| } |
| idetape_wait_for_pipeline (drive); |
| if (tape->merge_stage != NULL) { |
| __idetape_kfree_stage (tape->merge_stage); |
| tape->merge_stage = NULL; |
| } |
| clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); |
| tape->chrdev_direction = idetape_direction_none; |
| |
| /* |
| * On the next backup, perform the feedback loop again. |
| * (I don't want to keep sense information between backups, |
| * as some systems are constantly on, and the system load |
| * can be totally different on the next backup). |
| */ |
| tape->max_stages = tape->min_pipeline; |
| #if IDETAPE_DEBUG_BUGS |
| if (tape->first_stage != NULL || tape->next_stage != NULL || tape->last_stage != NULL || tape->nr_stages != 0) { |
| printk (KERN_ERR "ide-tape: ide-tape pipeline bug, " |
| "first_stage %p, next_stage %p, last_stage %p, nr_stages %d\n", |
| tape->first_stage, tape->next_stage, tape->last_stage, tape->nr_stages); |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| } |
| |
| static void idetape_restart_speed_control (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| tape->restart_speed_control_req = 0; |
| tape->pipeline_head = 0; |
| tape->buffer_head = tape->tape_head = tape->cur_frames; |
| tape->controlled_last_pipeline_head = tape->uncontrolled_last_pipeline_head = 0; |
| tape->controlled_previous_pipeline_head = tape->uncontrolled_previous_pipeline_head = 0; |
| tape->pipeline_head_speed = tape->controlled_pipeline_head_speed = 5000; |
| tape->uncontrolled_pipeline_head_speed = 0; |
| tape->controlled_pipeline_head_time = tape->uncontrolled_pipeline_head_time = jiffies; |
| tape->controlled_previous_head_time = tape->uncontrolled_previous_head_time = jiffies; |
| } |
| |
| static int idetape_initiate_read (ide_drive_t *drive, int max_stages) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *new_stage; |
| struct request rq; |
| int bytes_read; |
| int blocks = tape->capabilities.ctl; |
| |
| if (tape->chrdev_direction != idetape_direction_read) { /* Initialize read operation */ |
| if (tape->chrdev_direction == idetape_direction_write) { |
| idetape_empty_write_pipeline (drive); |
| idetape_flush_tape_buffers (drive); |
| } |
| #if IDETAPE_DEBUG_BUGS |
| if (tape->merge_stage || tape->merge_stage_size) { |
| printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); |
| tape->merge_stage_size = 0; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| if ((tape->merge_stage = __idetape_kmalloc_stage (tape, 0, 0)) == NULL) |
| return -ENOMEM; |
| tape->chrdev_direction = idetape_direction_read; |
| tape->logical_blk_num = 0; |
| |
| /* |
| * Issue a read 0 command to ensure that DSC handshake |
| * is switched from completion mode to buffer available |
| * mode. |
| */ |
| bytes_read = idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 0, tape->merge_stage->bio); |
| if (bytes_read < 0) { |
| kfree (tape->merge_stage); |
| tape->merge_stage = NULL; |
| tape->chrdev_direction = idetape_direction_none; |
| return bytes_read; |
| } |
| } |
| if (tape->restart_speed_control_req) |
| idetape_restart_speed_control(drive); |
| ide_init_drive_cmd (&rq); |
| rq.flags = IDETAPE_READ_RQ; |
| rq.sector = tape->first_frame_position; |
| rq.nr_sectors = rq.current_nr_sectors = blocks; |
| if (!test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags) && tape->nr_stages <= max_stages) { |
| new_stage = idetape_kmalloc_stage (tape); |
| while (new_stage != NULL) { |
| new_stage->rq = rq; |
| idetape_add_stage_tail (drive, new_stage); |
| if (tape->nr_stages >= max_stages) |
| break; |
| new_stage = idetape_kmalloc_stage (tape); |
| } |
| } |
| if (!idetape_pipeline_active(tape)) { |
| if (tape->nr_pending_stages >= 3 * max_stages / 4) { |
| tape->measure_insert_time = 1; |
| tape->insert_time = jiffies; |
| tape->insert_size = 0; |
| tape->insert_speed = 0; |
| idetape_insert_pipeline_into_queue (drive); |
| } else if (tape->onstream) { |
| idetape_update_stats(drive); |
| if (tape->cur_frames < tape->max_frames - 5) |
| idetape_insert_pipeline_into_queue (drive); |
| } |
| } |
| return 0; |
| } |
| |
| static int idetape_get_logical_blk (ide_drive_t *drive, int logical_blk_num, int max_stages, int quiet) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned long flags; |
| int cnt = 0, x, position; |
| |
| /* |
| * Search and wait for the next logical tape block |
| */ |
| while (1) { |
| if (cnt++ > 1000) { /* AJN: was 100 */ |
| printk(KERN_INFO "ide-tape: %s: couldn't find logical block %d, aborting\n", tape->name, logical_blk_num); |
| return 0; |
| } |
| idetape_initiate_read(drive, max_stages); |
| if (tape->first_stage == NULL) { |
| if (tape->onstream) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 1) |
| printk(KERN_INFO "ide-tape: %s: first_stage == NULL, pipeline error %ld\n", tape->name, (long)test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)); |
| #endif |
| clear_bit(IDETAPE_PIPELINE_ERROR, &tape->flags); |
| position = idetape_read_position(drive); |
| printk(KERN_INFO "ide-tape: %s: blank block detected at %d\n", tape->name, position); |
| if (position >= 3000 && position < 3080) |
| position += 32; /* Why is this check and number ??? MM */ |
| if (position >= OS_DATA_ENDFRAME1 && position < 3000) |
| position = 3000; |
| else |
| /* |
| * compensate for write errors that generally skip 80 frames, |
| * expect around 20 read errors in a row... |
| */ |
| position += 60; |
| if (position >= OS_DATA_ENDFRAME1 && position < 3000) |
| position = 3000; |
| printk(KERN_INFO "ide-tape: %s: positioning tape to block %d\n", tape->name, position); |
| if (position == 3000) /* seems to be needed to correctly position at block 3000 MM */ |
| idetape_position_tape(drive, 0, 0, 0); |
| idetape_position_tape(drive, position, 0, 0); |
| cnt += 40; |
| continue; |
| } else |
| return 0; |
| } |
| idetape_wait_first_stage(drive); |
| if (idetape_verify_stage(drive, tape->first_stage, logical_blk_num, quiet)) |
| break; |
| if (tape->first_stage->rq.errors == IDETAPE_ERROR_EOD) |
| cnt--; |
| if (idetape_verify_stage(drive, tape->first_stage, -1, quiet)) { |
| x = ntohl(tape->first_stage->aux->logical_blk_num); |
| if (x > logical_blk_num) { |
| printk(KERN_ERR "ide-tape: %s: couldn't find logical block %d, aborting (block %d found)\n", tape->name, logical_blk_num, x); |
| return 0; |
| } |
| } |
| spin_lock_irqsave(&tape->spinlock, flags); |
| idetape_remove_stage_head(drive); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| if (tape->onstream) |
| tape->logical_blk_num = ntohl(tape->first_stage->aux->logical_blk_num); |
| return 1; |
| } |
| |
| /* |
| * idetape_add_chrdev_read_request is called from idetape_chrdev_read |
| * to service a character device read request and add read-ahead |
| * requests to our pipeline. |
| */ |
| static int idetape_add_chrdev_read_request (ide_drive_t *drive,int blocks) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned long flags; |
| struct request *rq_ptr; |
| int bytes_read; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_add_chrdev_read_request, %d blocks\n", blocks); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| /* |
| * Wait for the next logical block to be available at the head |
| * of the pipeline |
| */ |
| if (!idetape_get_logical_blk(drive, tape->logical_blk_num, tape->max_stages, 0)) { |
| if (tape->onstream) { |
| set_bit(IDETAPE_READ_ERROR, &tape->flags); |
| return 0; |
| } |
| if (test_bit(IDETAPE_PIPELINE_ERROR, &tape->flags)) |
| return 0; |
| return idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, blocks, tape->merge_stage->bio); |
| } |
| rq_ptr = &tape->first_stage->rq; |
| bytes_read = tape->tape_block_size * (rq_ptr->nr_sectors - rq_ptr->current_nr_sectors); |
| rq_ptr->nr_sectors = rq_ptr->current_nr_sectors = 0; |
| |
| |
| if (tape->onstream && !tape->raw && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: EOD reached\n", tape->name); |
| #endif |
| return 0; |
| } |
| if (rq_ptr->errors == IDETAPE_ERROR_EOD) |
| return 0; |
| if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK) { |
| idetape_switch_buffers (tape, tape->first_stage); |
| set_bit (IDETAPE_FILEMARK, &tape->flags); |
| #if USE_IOTRACE |
| IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); |
| #endif |
| calculate_speeds(drive); |
| } else { |
| idetape_switch_buffers (tape, tape->first_stage); |
| if (rq_ptr->errors == IDETAPE_ERROR_GENERAL) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 1) |
| printk(KERN_INFO "ide-tape: error detected, bytes_read %d\n", bytes_read); |
| #endif |
| } |
| clear_bit (IDETAPE_FILEMARK, &tape->flags); |
| spin_lock_irqsave(&tape->spinlock, flags); |
| idetape_remove_stage_head (drive); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| tape->logical_blk_num++; |
| tape->pipeline_head++; |
| #if USE_IOTRACE |
| IO_trace(IO_IDETAPE_FIFO, tape->pipeline_head, tape->buffer_head, tape->tape_head, tape->minor); |
| #endif |
| calculate_speeds(drive); |
| } |
| #if IDETAPE_DEBUG_BUGS |
| if (bytes_read > blocks*tape->tape_block_size) { |
| printk (KERN_ERR "ide-tape: bug: trying to return more bytes than requested\n"); |
| bytes_read=blocks*tape->tape_block_size; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| return (bytes_read); |
| } |
| |
| static void idetape_pad_zeros (ide_drive_t *drive, int bcount) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| struct bio *bio; |
| int count, blocks; |
| |
| while (bcount) { |
| bio = tape->merge_stage->bio; |
| count = min(tape->stage_size, bcount); |
| bcount -= count; |
| blocks = count / tape->tape_block_size; |
| while (count) { |
| atomic_set(&bio->bi_cnt, min(count, bio->bi_size)); |
| memset (bio_data(bio), 0, bio->bi_size); |
| count -= atomic_read(&bio->bi_cnt); |
| bio = bio->bi_next; |
| } |
| idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, blocks, tape->merge_stage->bio); |
| } |
| } |
| |
| static int idetape_pipeline_size (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *stage; |
| struct request *rq; |
| int size = 0; |
| |
| idetape_wait_for_pipeline (drive); |
| stage = tape->first_stage; |
| while (stage != NULL) { |
| rq = &stage->rq; |
| size += tape->tape_block_size * (rq->nr_sectors-rq->current_nr_sectors); |
| if (rq->errors == IDETAPE_ERROR_FILEMARK) |
| size += tape->tape_block_size; |
| stage = stage->next; |
| } |
| size += tape->merge_stage_size; |
| return size; |
| } |
| |
| /* |
| * Rewinds the tape to the Beginning Of the current Partition (BOP). |
| * |
| * We currently support only one partition. |
| */ |
| static int idetape_rewind_tape (ide_drive_t *drive) |
| { |
| int retval; |
| idetape_pc_t pc; |
| idetape_tape_t *tape = drive->driver_data; |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk (KERN_INFO "ide-tape: Reached idetape_rewind_tape\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| idetape_create_rewind_cmd (drive, &pc); |
| retval = idetape_queue_pc_tail (drive, &pc); |
| if (retval) |
| return retval; |
| |
| idetape_create_read_position_cmd (&pc); |
| retval = idetape_queue_pc_tail (drive, &pc); |
| if (retval) |
| return retval; |
| tape->logical_blk_num = 0; |
| return 0; |
| } |
| |
| /* |
| * Our special ide-tape ioctl's. |
| * |
| * Currently there aren't any ioctl's. |
| * mtio.h compatible commands should be issued to the character device |
| * interface. |
| */ |
| static int idetape_blkdev_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_config_t config; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 4) |
| printk (KERN_INFO "ide-tape: Reached idetape_blkdev_ioctl\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| switch (cmd) { |
| case 0x0340: |
| if (copy_from_user ((char *) &config, (char *) arg, sizeof (idetape_config_t))) |
| return -EFAULT; |
| tape->best_dsc_rw_frequency = config.dsc_rw_frequency; |
| tape->max_stages = config.nr_stages; |
| break; |
| case 0x0350: |
| config.dsc_rw_frequency = (int) tape->best_dsc_rw_frequency; |
| config.nr_stages = tape->max_stages; |
| if (copy_to_user ((char *) arg, (char *) &config, sizeof (idetape_config_t))) |
| return -EFAULT; |
| break; |
| default: |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| /* |
| * The block device interface should not be used for data transfers. |
| * However, we still allow opening it so that we can issue general |
| * ide driver configuration ioctl's, such as the interrupt unmask feature. |
| */ |
| static int idetape_blkdev_open (struct inode *inode, struct file *filp, ide_drive_t *drive) |
| { |
| MOD_INC_USE_COUNT; |
| #if ONSTREAM_DEBUG |
| printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_blkdev_open\n"); |
| #endif |
| return 0; |
| } |
| |
| static void idetape_blkdev_release (struct inode *inode, struct file *filp, ide_drive_t *drive) |
| { |
| MOD_DEC_USE_COUNT; |
| #if ONSTREAM_DEBUG |
| printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_blkdev_release\n"); |
| #endif |
| } |
| |
| /* |
| * idetape_pre_reset is called before an ATAPI/ATA software reset. |
| */ |
| static void idetape_pre_reset (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| if (tape != NULL) |
| set_bit (IDETAPE_IGNORE_DSC, &tape->flags); |
| } |
| |
| /* |
| * Character device interface functions |
| */ |
| static ide_drive_t *get_drive_ptr (kdev_t i_rdev) |
| { |
| unsigned int i = minor(i_rdev) & ~0xc0; |
| |
| if (i >= MAX_HWIFS * MAX_DRIVES) |
| return NULL; |
| return (idetape_chrdevs[i].drive); |
| } |
| |
| static int idetape_onstream_space_over_filemarks_backward (ide_drive_t *drive,short mt_op,int mt_count) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int cnt = 0; |
| int last_mark_addr; |
| unsigned long flags; |
| |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_bwd\n", tape->name); |
| return -EIO; |
| } |
| while (cnt != mt_count) { |
| last_mark_addr = ntohl(tape->first_stage->aux->last_mark_addr); |
| if (last_mark_addr == -1) |
| return -EIO; |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: positioning to last mark at %d\n", last_mark_addr); |
| #endif |
| idetape_position_tape(drive, last_mark_addr, 0, 0); |
| cnt++; |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); |
| return -EIO; |
| } |
| if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { |
| printk(KERN_INFO "ide-tape: %s: expected to find marker at block %d, not found\n", tape->name, last_mark_addr); |
| return -EIO; |
| } |
| } |
| if (mt_op == MTBSFM) { |
| spin_lock_irqsave(&tape->spinlock, flags); |
| idetape_remove_stage_head (drive); |
| tape->logical_blk_num++; |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| return 0; |
| } |
| |
| /* |
| * ADRL 1.1 compatible "slow" space filemarks fwd version |
| * |
| * Just scans for the filemark sequentially. |
| */ |
| static int idetape_onstream_space_over_filemarks_forward_slow (ide_drive_t *drive,short mt_op,int mt_count) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int cnt = 0; |
| unsigned long flags; |
| |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd\n", tape->name); |
| return -EIO; |
| } |
| while (1) { |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); |
| return -EIO; |
| } |
| if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_MARKER) |
| cnt++; |
| if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: space_fwd: EOD reached\n", tape->name); |
| #endif |
| return -EIO; |
| } |
| if (cnt == mt_count) |
| break; |
| spin_lock_irqsave(&tape->spinlock, flags); |
| idetape_remove_stage_head (drive); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| if (mt_op == MTFSF) { |
| spin_lock_irqsave(&tape->spinlock, flags); |
| idetape_remove_stage_head (drive); |
| tape->logical_blk_num++; |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| return 0; |
| } |
| |
| |
| /* |
| * Fast linux specific version of OnStream FSF |
| */ |
| static int idetape_onstream_space_over_filemarks_forward_fast (ide_drive_t *drive,short mt_op,int mt_count) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int cnt = 0, next_mark_addr; |
| unsigned long flags; |
| |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd\n", tape->name); |
| return -EIO; |
| } |
| |
| /* |
| * Find nearest (usually previous) marker |
| */ |
| while (1) { |
| if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_MARKER) |
| break; |
| if (tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: space_fwd: EOD reached\n", tape->name); |
| #endif |
| return -EIO; |
| } |
| if (ntohl(tape->first_stage->aux->filemark_cnt) == 0) { |
| if (tape->first_mark_addr == -1) { |
| printk(KERN_INFO "ide-tape: %s: reverting to slow filemark space\n", tape->name); |
| return idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count); |
| } |
| idetape_position_tape(drive, tape->first_mark_addr, 0, 0); |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks_fwd_fast\n", tape->name); |
| return -EIO; |
| } |
| if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { |
| printk(KERN_INFO "ide-tape: %s: expected to find filemark at %d\n", tape->name, tape->first_mark_addr); |
| return -EIO; |
| } |
| } else { |
| if (idetape_onstream_space_over_filemarks_backward(drive, MTBSF, 1) < 0) |
| return -EIO; |
| mt_count++; |
| } |
| } |
| cnt++; |
| while (cnt != mt_count) { |
| next_mark_addr = ntohl(tape->first_stage->aux->next_mark_addr); |
| if (!next_mark_addr || next_mark_addr > tape->eod_frame_addr) { |
| printk(KERN_INFO "ide-tape: %s: reverting to slow filemark space\n", tape->name); |
| return idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count - cnt); |
| #if ONSTREAM_DEBUG |
| } else if (tape->debug_level >= 2) { |
| printk(KERN_INFO "ide-tape: positioning to next mark at %d\n", next_mark_addr); |
| #endif |
| } |
| idetape_position_tape(drive, next_mark_addr, 0, 0); |
| cnt++; |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't get logical blk num in space_filemarks\n", tape->name); |
| return -EIO; |
| } |
| if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_MARKER) { |
| printk(KERN_INFO "ide-tape: %s: expected to find marker at block %d, not found\n", tape->name, next_mark_addr); |
| return -EIO; |
| } |
| } |
| if (mt_op == MTFSF) { |
| spin_lock_irqsave(&tape->spinlock, flags); |
| idetape_remove_stage_head (drive); |
| tape->logical_blk_num++; |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| return 0; |
| } |
| |
| /* |
| * idetape_space_over_filemarks is now a bit more complicated than just |
| * passing the command to the tape since we may have crossed some |
| * filemarks during our pipelined read-ahead mode. |
| * |
| * As a minor side effect, the pipeline enables us to support MTFSFM when |
| * the filemark is in our internal pipeline even if the tape doesn't |
| * support spacing over filemarks in the reverse direction. |
| */ |
| static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_count) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t pc; |
| unsigned long flags; |
| int retval,count=0; |
| int speed_control; |
| |
| if (tape->onstream) { |
| if (tape->raw) |
| return -EIO; |
| speed_control = tape->speed_control; |
| tape->speed_control = 0; |
| if (mt_op == MTFSF || mt_op == MTFSFM) { |
| if (tape->linux_media) |
| retval = idetape_onstream_space_over_filemarks_forward_fast(drive, mt_op, mt_count); |
| else |
| retval = idetape_onstream_space_over_filemarks_forward_slow(drive, mt_op, mt_count); |
| } else |
| retval = idetape_onstream_space_over_filemarks_backward(drive, mt_op, mt_count); |
| tape->speed_control = speed_control; |
| tape->restart_speed_control_req = 1; |
| return retval; |
| } |
| |
| if (tape->chrdev_direction == idetape_direction_read) { |
| /* |
| * We have a read-ahead buffer. Scan it for crossed |
| * filemarks. |
| */ |
| tape->merge_stage_size = 0; |
| clear_bit (IDETAPE_FILEMARK, &tape->flags); |
| while (tape->first_stage != NULL) { |
| idetape_wait_first_stage(drive); |
| if (tape->first_stage->rq.errors == IDETAPE_ERROR_FILEMARK) |
| count++; |
| if (count == mt_count) { |
| switch (mt_op) { |
| case MTFSF: |
| spin_lock_irqsave(&tape->spinlock, flags); |
| idetape_remove_stage_head (drive); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| case MTFSFM: |
| return (0); |
| default: |
| break; |
| } |
| } |
| spin_lock_irqsave(&tape->spinlock, flags); |
| idetape_remove_stage_head (drive); |
| spin_unlock_irqrestore(&tape->spinlock, flags); |
| } |
| idetape_discard_read_pipeline (drive, 1); |
| } |
| |
| /* |
| * The filemark was not found in our internal pipeline. |
| * Now we can issue the space command. |
| */ |
| switch (mt_op) { |
| case MTFSF: |
| idetape_create_space_cmd (&pc,mt_count-count,IDETAPE_SPACE_OVER_FILEMARK); |
| return (idetape_queue_pc_tail (drive, &pc)); |
| case MTFSFM: |
| if (!tape->capabilities.sprev) |
| return (-EIO); |
| retval = idetape_space_over_filemarks (drive, MTFSF, mt_count-count); |
| if (retval) return (retval); |
| return (idetape_space_over_filemarks (drive, MTBSF, 1)); |
| case MTBSF: |
| if (!tape->capabilities.sprev) |
| return (-EIO); |
| idetape_create_space_cmd (&pc,-(mt_count+count),IDETAPE_SPACE_OVER_FILEMARK); |
| return (idetape_queue_pc_tail (drive, &pc)); |
| case MTBSFM: |
| if (!tape->capabilities.sprev) |
| return (-EIO); |
| retval = idetape_space_over_filemarks (drive, MTBSF, mt_count+count); |
| if (retval) return (retval); |
| return (idetape_space_over_filemarks (drive, MTFSF, 1)); |
| default: |
| printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); |
| return (-EIO); |
| } |
| } |
| |
| |
| /* |
| * Our character device read / write functions. |
| * |
| * The tape is optimized to maximize throughput when it is transferring |
| * an integral number of the "continuous transfer limit", which is |
| * a parameter of the specific tape (26 KB on my particular tape). |
| * (32 kB for Onstream) |
| * |
| * As of version 1.3 of the driver, the character device provides an |
| * abstract continuous view of the media - any mix of block sizes (even 1 |
| * byte) on the same backup/restore procedure is supported. The driver |
| * will internally convert the requests to the recommended transfer unit, |
| * so that an unmatch between the user's block size to the recommended |
| * size will only result in a (slightly) increased driver overhead, but |
| * will no longer hit performance. |
| * This is not applicable to Onstream. |
| */ |
| static ssize_t idetape_chrdev_read (struct file *file, char *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode *inode = file->f_dentry->d_inode; |
| ide_drive_t *drive = get_drive_ptr (inode->i_rdev); |
| idetape_tape_t *tape = drive->driver_data; |
| ssize_t bytes_read,temp, actually_read = 0, rc; |
| |
| if (ppos != &file->f_pos) { |
| /* "A request was outside the capabilities of the device." */ |
| return -ENXIO; |
| } |
| if (tape->onstream && (count != tape->tape_block_size)) { |
| printk(KERN_ERR "ide-tape: %s: use %d bytes as block size (%Zd used)\n", tape->name, tape->tape_block_size, count); |
| return -EINVAL; |
| } |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 3) |
| printk (KERN_INFO "ide-tape: Reached idetape_chrdev_read, count %Zd\n", count); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| if (tape->chrdev_direction != idetape_direction_read) { |
| if (test_bit (IDETAPE_DETECT_BS, &tape->flags)) |
| if (count > tape->tape_block_size && (count % tape->tape_block_size) == 0) |
| tape->user_bs_factor = count / tape->tape_block_size; |
| } |
| if ((rc = idetape_initiate_read(drive, tape->max_stages)) < 0) |
| return rc; |
| if (count == 0) |
| return (0); |
| if (tape->merge_stage_size) { |
| actually_read = min(tape->merge_stage_size, count); |
| idetape_copy_stage_to_user (tape, buf, tape->merge_stage, actually_read); |
| buf += actually_read; |
| tape->merge_stage_size -= actually_read; |
| count -= actually_read; |
| } |
| while (count >= tape->stage_size) { |
| bytes_read = idetape_add_chrdev_read_request (drive, tape->capabilities.ctl); |
| if (bytes_read <= 0) |
| goto finish; |
| idetape_copy_stage_to_user (tape, buf, tape->merge_stage, bytes_read); |
| buf += bytes_read; |
| count -= bytes_read; |
| actually_read += bytes_read; |
| } |
| if (count) { |
| bytes_read=idetape_add_chrdev_read_request (drive, tape->capabilities.ctl); |
| if (bytes_read <= 0) |
| goto finish; |
| temp = min(count, bytes_read); |
| idetape_copy_stage_to_user (tape, buf, tape->merge_stage, temp); |
| actually_read += temp; |
| tape->merge_stage_size = bytes_read-temp; |
| } |
| finish: |
| if (!actually_read && test_bit (IDETAPE_FILEMARK, &tape->flags)) { |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: spacing over filemark\n", tape->name); |
| #endif |
| idetape_space_over_filemarks (drive, MTFSF, 1); |
| return 0; |
| } |
| if (tape->onstream && !actually_read && test_and_clear_bit(IDETAPE_READ_ERROR, &tape->flags)) { |
| printk(KERN_ERR "ide-tape: %s: unrecovered read error on logical block number %d, skipping\n", |
| tape->name, tape->logical_blk_num); |
| tape->logical_blk_num++; |
| return -EIO; |
| } |
| return actually_read; |
| } |
| |
| static void idetape_update_last_marker (ide_drive_t *drive, int last_mark_addr, int next_mark_addr) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *stage; |
| os_aux_t *aux; |
| int position; |
| |
| if (!tape->onstream || tape->raw) |
| return; |
| if (last_mark_addr == -1) |
| return; |
| stage = __idetape_kmalloc_stage(tape, 0, 0); |
| if (stage == NULL) |
| return; |
| idetape_flush_tape_buffers(drive); |
| position = idetape_read_position(drive); |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: current position (2) %d, lblk %d\n", position, tape->logical_blk_num); |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: current position (2) tape block %d\n", tape->last_frame_position); |
| #endif |
| idetape_position_tape(drive, last_mark_addr, 0, 0); |
| if (!idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 1, stage->bio)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't read last marker\n", tape->name); |
| __idetape_kfree_stage (stage); |
| idetape_position_tape(drive, position, 0, 0); |
| return; |
| } |
| aux = stage->aux; |
| if (aux->frame_type != OS_FRAME_TYPE_MARKER) { |
| printk(KERN_INFO "ide-tape: %s: expected to find marker at addr %d\n", tape->name, last_mark_addr); |
| __idetape_kfree_stage (stage); |
| idetape_position_tape(drive, position, 0, 0); |
| return; |
| } |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: writing back marker\n"); |
| #endif |
| aux->next_mark_addr = htonl(next_mark_addr); |
| idetape_position_tape(drive, last_mark_addr, 0, 0); |
| if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bio)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't write back marker frame at %d\n", tape->name, last_mark_addr); |
| __idetape_kfree_stage (stage); |
| idetape_position_tape(drive, position, 0, 0); |
| return; |
| } |
| __idetape_kfree_stage (stage); |
| idetape_flush_tape_buffers (drive); |
| idetape_position_tape(drive, position, 0, 0); |
| return; |
| } |
| |
| static void idetape_write_filler (ide_drive_t *drive, int block, int cnt) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *stage; |
| int rc; |
| |
| if (!tape->onstream || tape->raw) |
| return; |
| stage = __idetape_kmalloc_stage(tape, 1, 1); |
| if (stage == NULL) |
| return; |
| idetape_init_stage(drive, stage, OS_FRAME_TYPE_FILL, 0); |
| idetape_wait_ready(drive, 60 * 5 * HZ); |
| rc = idetape_position_tape(drive, block, 0, 0); |
| #if ONSTREAM_DEBUG |
| printk(KERN_INFO "write_filler: positioning failed it returned %d\n", rc); |
| #endif |
| if (rc != 0) |
| return; /* don't write fillers if we cannot position the tape. */ |
| |
| strcpy(bio_data(stage->bio), "Filler"); |
| while (cnt--) { |
| if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bio)) { |
| printk(KERN_INFO "ide-tape: %s: write_filler: couldn't write header frame\n", tape->name); |
| __idetape_kfree_stage (stage); |
| return; |
| } |
| } |
| __idetape_kfree_stage (stage); |
| } |
| |
| static void __idetape_write_header (ide_drive_t *drive, int block, int cnt) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *stage; |
| os_header_t header; |
| |
| stage = __idetape_kmalloc_stage(tape, 1, 1); |
| if (stage == NULL) |
| return; |
| idetape_init_stage(drive, stage, OS_FRAME_TYPE_HEADER, tape->logical_blk_num); |
| idetape_wait_ready(drive, 60 * 5 * HZ); |
| idetape_position_tape(drive, block, 0, 0); |
| memset(&header, 0, sizeof(header)); |
| strcpy(header.ident_str, "ADR_SEQ"); |
| header.major_rev = 1; |
| header.minor_rev = OS_ADR_MINREV; |
| header.par_num = 1; |
| header.partition.partition_num = OS_DATA_PARTITION; |
| header.partition.par_desc_ver = OS_PARTITION_VERSION; |
| header.partition.first_frame_addr = htonl(OS_DATA_STARTFRAME1); |
| header.partition.last_frame_addr = htonl(tape->capacity); |
| header.partition.wrt_pass_cntr = htons(tape->wrt_pass_cntr); |
| header.partition.eod_frame_addr = htonl(tape->eod_frame_addr); |
| memcpy(bio_data(stage->bio), &header, sizeof(header)); |
| while (cnt--) { |
| if (!idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 1, stage->bio)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't write header frame\n", tape->name); |
| __idetape_kfree_stage (stage); |
| return; |
| } |
| } |
| __idetape_kfree_stage (stage); |
| idetape_flush_tape_buffers (drive); |
| } |
| |
| static void idetape_write_header (ide_drive_t *drive, int locate_eod) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: writing tape header\n", tape->name); |
| #endif |
| if (!tape->onstream || tape->raw) |
| return; |
| tape->update_frame_cntr++; |
| __idetape_write_header(drive, 5, 5); |
| __idetape_write_header(drive, 0xbae, 5); /* 2990 */ |
| if (locate_eod) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: locating back to eod frame addr %d\n", tape->name, tape->eod_frame_addr); |
| #endif |
| idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); |
| } |
| } |
| |
| static ssize_t idetape_chrdev_write (struct file *file, const char *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct inode *inode = file->f_dentry->d_inode; |
| ide_drive_t *drive = get_drive_ptr (inode->i_rdev); |
| idetape_tape_t *tape = drive->driver_data; |
| ssize_t retval, actually_written = 0; |
| int position; |
| |
| if (ppos != &file->f_pos) { |
| /* "A request was outside the capabilities of the device." */ |
| return -ENXIO; |
| } |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 3) |
| printk (KERN_INFO "ide-tape: Reached idetape_chrdev_write, count %Zd\n", count); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| if (tape->onstream) { |
| if (count != tape->tape_block_size) { |
| printk(KERN_ERR "ide-tape: %s: chrdev_write: use %d bytes as block size (%Zd used)\n", |
| tape->name, tape->tape_block_size, count); |
| return -EINVAL; |
| } |
| /* |
| * Check if we reach the end of the tape. Just assume the whole pipeline |
| * is filled with write requests! |
| */ |
| if (tape->first_frame_position + tape->nr_stages >= tape->capacity - OS_EW) { |
| #if ONSTREAM_DEBUG |
| printk(KERN_INFO, "chrdev_write: Write truncated at EOM early warning"); |
| #endif |
| if (tape->chrdev_direction == idetape_direction_write) |
| idetape_write_release(inode); |
| return -ENOSPC; |
| } |
| } |
| |
| if (tape->chrdev_direction != idetape_direction_write) { /* Initialize write operation */ |
| if (tape->chrdev_direction == idetape_direction_read) |
| idetape_discard_read_pipeline (drive, 1); |
| #if IDETAPE_DEBUG_BUGS |
| if (tape->merge_stage || tape->merge_stage_size) { |
| printk (KERN_ERR "ide-tape: merge_stage_size should be 0 now\n"); |
| tape->merge_stage_size = 0; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| if ((tape->merge_stage = __idetape_kmalloc_stage (tape, 0, 0)) == NULL) |
| return -ENOMEM; |
| tape->chrdev_direction = idetape_direction_write; |
| idetape_init_merge_stage (tape); |
| |
| if (tape->onstream) { |
| position = idetape_read_position(drive); |
| if (position <= OS_DATA_STARTFRAME1) { |
| tape->logical_blk_num = 0; |
| tape->wrt_pass_cntr++; |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: logical block num 0, setting eod to %d\n", tape->name, OS_DATA_STARTFRAME1); |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: allocating new write pass counter %d\n", tape->name, tape->wrt_pass_cntr); |
| #endif |
| tape->filemark_cnt = 0; |
| tape->eod_frame_addr = OS_DATA_STARTFRAME1; |
| tape->first_mark_addr = tape->last_mark_addr = -1; |
| idetape_write_header(drive, 1); |
| } |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: positioning tape to eod at %d\n", tape->name, tape->eod_frame_addr); |
| #endif |
| position = idetape_read_position(drive); |
| if (position != tape->eod_frame_addr) |
| idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: first_frame_position %d\n", tape->name, tape->first_frame_position); |
| #endif |
| } |
| |
| /* |
| * Issue a write 0 command to ensure that DSC handshake |
| * is switched from completion mode to buffer available |
| * mode. |
| */ |
| retval = idetape_queue_rw_tail (drive, IDETAPE_WRITE_RQ, 0, tape->merge_stage->bio); |
| if (retval < 0) { |
| kfree (tape->merge_stage); |
| tape->merge_stage = NULL; |
| tape->chrdev_direction = idetape_direction_none; |
| return retval; |
| } |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk("ide-tape: first_frame_position %d\n", tape->first_frame_position); |
| #endif |
| } |
| if (count == 0) |
| return (0); |
| if (tape->restart_speed_control_req) |
| idetape_restart_speed_control(drive); |
| if (tape->merge_stage_size) { |
| #if IDETAPE_DEBUG_BUGS |
| if (tape->merge_stage_size >= tape->stage_size) { |
| printk (KERN_ERR "ide-tape: bug: merge buffer too big\n"); |
| tape->merge_stage_size = 0; |
| } |
| #endif /* IDETAPE_DEBUG_BUGS */ |
| actually_written = min(tape->stage_size - tape->merge_stage_size, count); |
| idetape_copy_stage_from_user (tape, tape->merge_stage, buf, actually_written); |
| buf += actually_written; |
| tape->merge_stage_size += actually_written; |
| count -= actually_written; |
| |
| if (tape->merge_stage_size == tape->stage_size) { |
| tape->merge_stage_size = 0; |
| retval = idetape_add_chrdev_write_request (drive, tape->capabilities.ctl); |
| if (retval <= 0) |
| return (retval); |
| } |
| } |
| while (count >= tape->stage_size) { |
| idetape_copy_stage_from_user (tape, tape->merge_stage, buf, tape->stage_size); |
| buf += tape->stage_size; |
| count -= tape->stage_size; |
| retval = idetape_add_chrdev_write_request (drive, tape->capabilities.ctl); |
| actually_written += tape->stage_size; |
| if (retval <= 0) |
| return (retval); |
| } |
| if (count) { |
| actually_written+=count; |
| idetape_copy_stage_from_user (tape, tape->merge_stage, buf, count); |
| tape->merge_stage_size += count; |
| } |
| return (actually_written); |
| } |
| |
| static int idetape_write_filemark (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int last_mark_addr; |
| idetape_pc_t pc; |
| |
| if (!tape->onstream) { |
| idetape_create_write_filemark_cmd(drive, &pc, 1); /* Write a filemark */ |
| if (idetape_queue_pc_tail (drive, &pc)) { |
| printk (KERN_ERR "ide-tape: Couldn't write a filemark\n"); |
| return -EIO; |
| } |
| } else if (!tape->raw) { |
| last_mark_addr = idetape_read_position(drive); |
| tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); |
| if (tape->merge_stage != NULL) { |
| idetape_init_stage(drive, tape->merge_stage, OS_FRAME_TYPE_MARKER, tape->logical_blk_num); |
| idetape_pad_zeros (drive, tape->stage_size); |
| tape->logical_blk_num++; |
| __idetape_kfree_stage (tape->merge_stage); |
| tape->merge_stage = NULL; |
| } |
| if (tape->filemark_cnt) |
| idetape_update_last_marker(drive, tape->last_mark_addr, last_mark_addr); |
| tape->last_mark_addr = last_mark_addr; |
| if (tape->filemark_cnt++ == 0) |
| tape->first_mark_addr = last_mark_addr; |
| } |
| return 0; |
| } |
| |
| static void idetape_write_eod (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| if (!tape->onstream || tape->raw) |
| return; |
| tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); |
| if (tape->merge_stage != NULL) { |
| tape->eod_frame_addr = idetape_read_position(drive); |
| idetape_init_stage(drive, tape->merge_stage, OS_FRAME_TYPE_EOD, tape->logical_blk_num); |
| idetape_pad_zeros (drive, tape->stage_size); |
| __idetape_kfree_stage (tape->merge_stage); |
| tape->merge_stage = NULL; |
| } |
| return; |
| } |
| |
| int idetape_seek_logical_blk (ide_drive_t *drive, int logical_blk_num) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int estimated_address = logical_blk_num + 20; |
| int retries = 0; |
| int speed_control; |
| |
| speed_control = tape->speed_control; |
| tape->speed_control = 0; |
| if (logical_blk_num < 0) |
| logical_blk_num = 0; |
| if (idetape_get_logical_blk(drive, logical_blk_num, 10, 1)) |
| goto ok; |
| while (++retries < 10) { |
| idetape_discard_read_pipeline(drive, 0); |
| idetape_position_tape(drive, estimated_address, 0, 0); |
| if (idetape_get_logical_blk(drive, logical_blk_num, 10, 1)) |
| goto ok; |
| if (!idetape_get_logical_blk(drive, -1, 10, 1)) |
| goto error; |
| if (tape->logical_blk_num < logical_blk_num) |
| estimated_address += logical_blk_num - tape->logical_blk_num; |
| else |
| break; |
| } |
| error: |
| tape->speed_control = speed_control; |
| tape->restart_speed_control_req = 1; |
| printk(KERN_INFO "ide-tape: %s: couldn't seek to logical block %d (at %d), %d retries\n", tape->name, logical_blk_num, tape->logical_blk_num, retries); |
| return -EIO; |
| ok: |
| tape->speed_control = speed_control; |
| tape->restart_speed_control_req = 1; |
| return 0; |
| } |
| |
| /* |
| * idetape_mtioctop is called from idetape_chrdev_ioctl when |
| * the general mtio MTIOCTOP ioctl is requested. |
| * |
| * We currently support the following mtio.h operations: |
| * |
| * MTFSF - Space over mt_count filemarks in the positive direction. |
| * The tape is positioned after the last spaced filemark. |
| * |
| * MTFSFM - Same as MTFSF, but the tape is positioned before the |
| * last filemark. |
| * |
| * MTBSF - Steps background over mt_count filemarks, tape is |
| * positioned before the last filemark. |
| * |
| * MTBSFM - Like MTBSF, only tape is positioned after the last filemark. |
| * |
| * Note: |
| * |
| * MTBSF and MTBSFM are not supported when the tape doesn't |
| * supports spacing over filemarks in the reverse direction. |
| * In this case, MTFSFM is also usually not supported (it is |
| * supported in the rare case in which we crossed the filemark |
| * during our read-ahead pipelined operation mode). |
| * |
| * MTWEOF - Writes mt_count filemarks. Tape is positioned after |
| * the last written filemark. |
| * |
| * MTREW - Rewinds tape. |
| * |
| * MTLOAD - Loads the tape. |
| * |
| * MTOFFL - Puts the tape drive "Offline": Rewinds the tape and |
| * MTUNLOAD prevents further access until the media is replaced. |
| * |
| * MTNOP - Flushes tape buffers. |
| * |
| * MTRETEN - Retension media. This typically consists of one end |
| * to end pass on the media. |
| * |
| * MTEOM - Moves to the end of recorded data. |
| * |
| * MTERASE - Erases tape. |
| * |
| * MTSETBLK - Sets the user block size to mt_count bytes. If |
| * mt_count is 0, we will attempt to autodetect |
| * the block size. |
| * |
| * MTSEEK - Positions the tape in a specific block number, where |
| * each block is assumed to contain which user_block_size |
| * bytes. |
| * |
| * MTSETPART - Switches to another tape partition. |
| * |
| * MTLOCK - Locks the tape door. |
| * |
| * MTUNLOCK - Unlocks the tape door. |
| * |
| * The following commands are currently not supported: |
| * |
| * MTFSS, MTBSS, MTWSM, MTSETDENSITY, |
| * MTSETDRVBUFFER, MT_ST_BOOLEANS, MT_ST_WRITE_THRESHOLD. |
| */ |
| static int idetape_mtioctop (ide_drive_t *drive,short mt_op,int mt_count) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t pc; |
| int i,retval; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 1) |
| printk (KERN_INFO "ide-tape: Handling MTIOCTOP ioctl: mt_op=%d, mt_count=%d\n",mt_op,mt_count); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| /* |
| * Commands which need our pipelined read-ahead stages. |
| */ |
| switch (mt_op) { |
| case MTFSF: |
| case MTFSFM: |
| case MTBSF: |
| case MTBSFM: |
| if (!mt_count) |
| return (0); |
| return (idetape_space_over_filemarks (drive,mt_op,mt_count)); |
| default: |
| break; |
| } |
| switch (mt_op) { |
| case MTWEOF: |
| idetape_discard_read_pipeline (drive, 1); |
| for (i = 0; i < mt_count; i++) { |
| retval = idetape_write_filemark(drive); |
| if (retval) return retval; |
| } |
| return (0); |
| case MTREW: |
| idetape_discard_read_pipeline (drive, 0); |
| if (idetape_rewind_tape(drive)) |
| return -EIO; |
| if (tape->onstream && !tape->raw) |
| return idetape_position_tape(drive, OS_DATA_STARTFRAME1, 0, 0); |
| return 0; |
| case MTLOAD: |
| idetape_discard_read_pipeline (drive, 0); |
| idetape_create_load_unload_cmd (drive, &pc, IDETAPE_LU_LOAD_MASK); |
| return (idetape_queue_pc_tail (drive, &pc)); |
| case MTUNLOAD: |
| case MTOFFL: |
| idetape_discard_read_pipeline (drive, 0); |
| idetape_create_load_unload_cmd (drive, &pc,!IDETAPE_LU_LOAD_MASK); |
| return (idetape_queue_pc_tail (drive, &pc)); |
| case MTNOP: |
| idetape_discard_read_pipeline (drive, 0); |
| return (idetape_flush_tape_buffers (drive)); |
| case MTRETEN: |
| idetape_discard_read_pipeline (drive, 0); |
| idetape_create_load_unload_cmd (drive, &pc,IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK); |
| return (idetape_queue_pc_tail (drive, &pc)); |
| case MTEOM: |
| if (tape->onstream) { |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: positioning tape to eod at %d\n", tape->name, tape->eod_frame_addr); |
| #endif |
| idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) |
| return -EIO; |
| if (tape->first_stage->aux->frame_type != OS_FRAME_TYPE_EOD) |
| return -EIO; |
| return 0; |
| } |
| idetape_create_space_cmd (&pc, 0, IDETAPE_SPACE_TO_EOD); |
| return (idetape_queue_pc_tail (drive, &pc)); |
| case MTERASE: |
| if (tape->onstream) { |
| tape->eod_frame_addr = OS_DATA_STARTFRAME1; |
| tape->logical_blk_num = 0; |
| tape->first_mark_addr = tape->last_mark_addr = -1; |
| idetape_position_tape(drive, tape->eod_frame_addr, 0, 0); |
| idetape_write_eod(drive); |
| idetape_flush_tape_buffers (drive); |
| idetape_write_header(drive, 0); |
| /* |
| * write filler frames to the unused frames... |
| * REMOVE WHEN going to LIN4 application type... |
| */ |
| idetape_write_filler(drive, OS_DATA_STARTFRAME1 - 10, 10); |
| idetape_write_filler(drive, OS_DATA_ENDFRAME1, 10); |
| idetape_flush_tape_buffers (drive); |
| (void) idetape_rewind_tape (drive); |
| return 0; |
| } |
| (void) idetape_rewind_tape (drive); |
| idetape_create_erase_cmd (&pc); |
| return (idetape_queue_pc_tail (drive, &pc)); |
| case MTSETBLK: |
| if (tape->onstream) { |
| if (mt_count != tape->tape_block_size) { |
| printk(KERN_INFO "ide-tape: %s: MTSETBLK %d -- only %d bytes block size supported\n", tape->name, mt_count, tape->tape_block_size); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| if (mt_count) { |
| if (mt_count < tape->tape_block_size || mt_count % tape->tape_block_size) |
| return -EIO; |
| tape->user_bs_factor = mt_count / tape->tape_block_size; |
| clear_bit (IDETAPE_DETECT_BS, &tape->flags); |
| } else |
| set_bit (IDETAPE_DETECT_BS, &tape->flags); |
| return 0; |
| case MTSEEK: |
| if (!tape->onstream || tape->raw) { |
| idetape_discard_read_pipeline (drive, 0); |
| return idetape_position_tape (drive, mt_count * tape->user_bs_factor, tape->partition, 0); |
| } |
| return idetape_seek_logical_blk(drive, mt_count); |
| case MTSETPART: |
| idetape_discard_read_pipeline (drive, 0); |
| if (tape->onstream) |
| return -EIO; |
| return (idetape_position_tape (drive, 0, mt_count, 0)); |
| case MTFSR: |
| case MTBSR: |
| if (tape->onstream) { |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) |
| return -EIO; |
| if (mt_op == MTFSR) |
| return idetape_seek_logical_blk(drive, tape->logical_blk_num + mt_count); |
| else { |
| idetape_discard_read_pipeline (drive, 0); |
| return idetape_seek_logical_blk(drive, tape->logical_blk_num - mt_count); |
| } |
| } |
| case MTLOCK: |
| if (!idetape_create_prevent_cmd(drive, &pc, 1)) |
| return 0; |
| retval = idetape_queue_pc_tail (drive, &pc); |
| if (retval) return retval; |
| tape->door_locked = DOOR_EXPLICITLY_LOCKED; |
| return 0; |
| case MTUNLOCK: |
| if (!idetape_create_prevent_cmd(drive, &pc, 0)) |
| return 0; |
| retval = idetape_queue_pc_tail (drive, &pc); |
| if (retval) return retval; |
| tape->door_locked = DOOR_UNLOCKED; |
| return 0; |
| default: |
| printk (KERN_ERR "ide-tape: MTIO operation %d not supported\n",mt_op); |
| return (-EIO); |
| } |
| } |
| |
| /* |
| * Our character device ioctls. |
| * |
| * General mtio.h magnetic io commands are supported here, and not in |
| * the corresponding block interface. |
| * |
| * The following ioctls are supported: |
| * |
| * MTIOCTOP - Refer to idetape_mtioctop for detailed description. |
| * |
| * MTIOCGET - The mt_dsreg field in the returned mtget structure |
| * will be set to (user block size in bytes << |
| * MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK. |
| * |
| * The mt_blkno is set to the current user block number. |
| * The other mtget fields are not supported. |
| * |
| * MTIOCPOS - The current tape "block position" is returned. We |
| * assume that each block contains user_block_size |
| * bytes. |
| * |
| * Our own ide-tape ioctls are supported on both interfaces. |
| */ |
| static int idetape_chrdev_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) |
| { |
| ide_drive_t *drive = get_drive_ptr (inode->i_rdev); |
| idetape_tape_t *tape = drive->driver_data; |
| struct mtop mtop; |
| struct mtget mtget; |
| struct mtpos mtpos; |
| int block_offset = 0, position = tape->first_frame_position; |
| |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 3) |
| printk (KERN_INFO "ide-tape: Reached idetape_chrdev_ioctl, cmd=%u\n",cmd); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| tape->restart_speed_control_req = 1; |
| if (tape->chrdev_direction == idetape_direction_write) { |
| idetape_empty_write_pipeline (drive); |
| idetape_flush_tape_buffers (drive); |
| } |
| if (cmd == MTIOCGET || cmd == MTIOCPOS) { |
| block_offset = idetape_pipeline_size (drive) / (tape->tape_block_size * tape->user_bs_factor); |
| if ((position = idetape_read_position(drive)) < 0) |
| return -EIO; |
| } |
| switch (cmd) { |
| case MTIOCTOP: |
| if (copy_from_user ((char *) &mtop, (char *) arg, sizeof (struct mtop))) |
| return -EFAULT; |
| return (idetape_mtioctop (drive,mtop.mt_op,mtop.mt_count)); |
| case MTIOCGET: |
| memset (&mtget, 0, sizeof (struct mtget)); |
| mtget.mt_type = MT_ISSCSI2; |
| if (!tape->onstream || tape->raw) |
| mtget.mt_blkno = position / tape->user_bs_factor - block_offset; |
| else { |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) |
| mtget.mt_blkno = -1; |
| else |
| mtget.mt_blkno = tape->logical_blk_num; |
| } |
| mtget.mt_dsreg = ((tape->tape_block_size * tape->user_bs_factor) << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK; |
| if (tape->onstream) { |
| mtget.mt_gstat |= GMT_ONLINE(0xffffffff); |
| if (tape->first_stage && tape->first_stage->aux->frame_type == OS_FRAME_TYPE_EOD) |
| mtget.mt_gstat |= GMT_EOD(0xffffffff); |
| if (position <= OS_DATA_STARTFRAME1) |
| mtget.mt_gstat |= GMT_BOT(0xffffffff); |
| } |
| if (copy_to_user ((char *) arg,(char *) &mtget, sizeof (struct mtget))) |
| return -EFAULT; |
| return 0; |
| case MTIOCPOS: |
| if (tape->onstream && !tape->raw) { |
| if (!idetape_get_logical_blk(drive, -1, 10, 0)) |
| return -EIO; |
| mtpos.mt_blkno = tape->logical_blk_num; |
| } else |
| mtpos.mt_blkno = position / tape->user_bs_factor - block_offset; |
| if (copy_to_user ((char *) arg,(char *) &mtpos, sizeof (struct mtpos))) |
| return -EFAULT; |
| return 0; |
| default: |
| if (tape->chrdev_direction == idetape_direction_read) |
| idetape_discard_read_pipeline (drive, 1); |
| return (idetape_blkdev_ioctl (drive,inode,file,cmd,arg)); |
| } |
| } |
| |
| static int __idetape_analyze_headers (ide_drive_t *drive, int block) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_stage_t *stage; |
| os_header_t *header; |
| os_aux_t *aux; |
| |
| if (!tape->onstream || tape->raw) { |
| tape->header_ok = tape->linux_media = 1; |
| return 1; |
| } |
| tape->header_ok = tape->linux_media = 0; |
| tape->update_frame_cntr = 0; |
| tape->wrt_pass_cntr = 0; |
| tape->eod_frame_addr = OS_DATA_STARTFRAME1; |
| tape->first_mark_addr = tape->last_mark_addr = -1; |
| stage = __idetape_kmalloc_stage (tape, 0, 0); |
| if (stage == NULL) |
| return 0; |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: reading header\n", tape->name); |
| #endif |
| idetape_position_tape(drive, block, 0, 0); |
| if (!idetape_queue_rw_tail (drive, IDETAPE_READ_RQ, 1, stage->bio)) { |
| printk(KERN_INFO "ide-tape: %s: couldn't read header frame\n", tape->name); |
| __idetape_kfree_stage (stage); |
| return 0; |
| } |
| header = (os_header_t *) bio_data(stage->bio); |
| aux = stage->aux; |
| if (strncmp(header->ident_str, "ADR_SEQ", 7) != 0) { |
| printk(KERN_INFO "ide-tape: %s: invalid header identification string\n", tape->name); |
| __idetape_kfree_stage (stage); |
| return 0; |
| } |
| if (header->major_rev != 1 || (header->minor_rev > OS_ADR_MINREV)) |
| printk(KERN_INFO "ide-tape: warning: revision %d.%d detected (up to 1.%d supported)\n", header->major_rev, header->minor_rev, OS_ADR_MINREV); |
| if (header->par_num != 1) |
| printk(KERN_INFO "ide-tape: warning: %d partitions defined, only one supported\n", header->par_num); |
| tape->wrt_pass_cntr = ntohs(header->partition.wrt_pass_cntr); |
| tape->eod_frame_addr = ntohl(header->partition.eod_frame_addr); |
| tape->filemark_cnt = ntohl(aux->filemark_cnt); |
| tape->first_mark_addr = ntohl(aux->next_mark_addr); |
| tape->last_mark_addr = ntohl(aux->last_mark_addr); |
| tape->update_frame_cntr = ntohl(aux->update_frame_cntr); |
| memcpy(tape->application_sig, aux->application_sig, 4); |
| tape->application_sig[4] = 0; |
| if (memcmp(tape->application_sig, "LIN", 3) == 0) { |
| tape->linux_media = 1; |
| tape->linux_media_version = tape->application_sig[3] - '0'; |
| if (tape->linux_media_version != 3) |
| printk(KERN_INFO "ide-tape: %s: Linux media version %d detected (current 3)\n", |
| tape->name, tape->linux_media_version); |
| } else { |
| printk(KERN_INFO "ide-tape: %s: non Linux media detected (%s)\n", tape->name, tape->application_sig); |
| tape->linux_media = 0; |
| } |
| #if ONSTREAM_DEBUG |
| if (tape->debug_level >= 2) |
| printk(KERN_INFO "ide-tape: %s: detected write pass counter %d, eod frame addr %d\n", tape->name, tape->wrt_pass_cntr, tape->eod_frame_addr); |
| #endif |
| __idetape_kfree_stage (stage); |
| return 1; |
| } |
| |
| static int idetape_analyze_headers (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int position, block; |
| |
| if (!tape->onstream || tape->raw) { |
| tape->header_ok = tape->linux_media = 1; |
| return 1; |
| } |
| tape->header_ok = tape->linux_media = 0; |
| position = idetape_read_position(drive); |
| for (block = 5; block < 10; block++) |
| if (__idetape_analyze_headers(drive, block)) |
| goto ok; |
| for (block = 0xbae; block < 0xbb3; block++) /* 2990 - 2994 */ |
| if (__idetape_analyze_headers(drive, block)) |
| goto ok; |
| printk(KERN_ERR "ide-tape: %s: failed to find valid ADRL header\n", tape->name); |
| return 0; |
| ok: |
| if (position < OS_DATA_STARTFRAME1) |
| position = OS_DATA_STARTFRAME1; |
| idetape_position_tape(drive, position, 0, 0); |
| tape->header_ok = 1; |
| return 1; |
| } |
| |
| /* |
| * Our character device open function. |
| */ |
| static int idetape_chrdev_open (struct inode *inode, struct file *filp) |
| { |
| ide_drive_t *drive; |
| idetape_tape_t *tape; |
| idetape_pc_t pc; |
| unsigned int minor=minor(inode->i_rdev); |
| |
| #if IDETAPE_DEBUG_LOG |
| printk (KERN_INFO "ide-tape: Reached idetape_chrdev_open\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| if ((drive = get_drive_ptr (inode->i_rdev)) == NULL) |
| return -ENXIO; |
| tape = drive->driver_data; |
| |
| if (test_and_set_bit (IDETAPE_BUSY, &tape->flags)) |
| return -EBUSY; |
| MOD_INC_USE_COUNT; |
| if (!tape->onstream) { |
| idetape_read_position(drive); |
| if (!test_bit (IDETAPE_ADDRESS_VALID, &tape->flags)) |
| (void) idetape_rewind_tape (drive); |
| } else { |
| if (minor & 64) { |
| tape->tape_block_size = tape->stage_size = 32768 + 512; |
| tape->raw = 1; |
| } else { |
| tape->tape_block_size = tape->stage_size = 32768; |
| tape->raw = 0; |
| } |
| idetape_onstream_mode_sense_tape_parameter_page(drive, tape->debug_level); |
| } |
| if (idetape_wait_ready(drive, 60 * HZ)) { |
| clear_bit(IDETAPE_BUSY, &tape->flags); |
| printk(KERN_ERR "ide-tape: %s: drive not ready\n", tape->name); |
| MOD_DEC_USE_COUNT; |
| return -EBUSY; |
| } |
| idetape_read_position(drive); |
| MOD_DEC_USE_COUNT; |
| clear_bit (IDETAPE_PIPELINE_ERROR, &tape->flags); |
| |
| if (tape->chrdev_direction == idetape_direction_none) { |
| MOD_INC_USE_COUNT; |
| if (idetape_create_prevent_cmd(drive, &pc, 1)) { |
| if (!idetape_queue_pc_tail (drive, &pc)) { |
| if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) |
| tape->door_locked = DOOR_LOCKED; |
| } |
| } |
| idetape_analyze_headers(drive); |
| } |
| tape->max_frames = tape->cur_frames = tape->req_buffer_fill = 0; |
| idetape_restart_speed_control(drive); |
| tape->restart_speed_control_req = 0; |
| return 0; |
| } |
| |
| static void idetape_write_release (struct inode *inode) |
| { |
| ide_drive_t *drive = get_drive_ptr (inode->i_rdev); |
| idetape_tape_t *tape = drive->driver_data; |
| unsigned int minor=minor(inode->i_rdev); |
| |
| idetape_empty_write_pipeline (drive); |
| tape->merge_stage = __idetape_kmalloc_stage (tape, 1, 0); |
| if (tape->merge_stage != NULL) { |
| idetape_pad_zeros (drive, tape->tape_block_size * (tape->user_bs_factor - 1)); |
| __idetape_kfree_stage (tape->merge_stage); |
| tape->merge_stage = NULL; |
| } |
| idetape_write_filemark(drive); |
| idetape_write_eod(drive); |
| idetape_flush_tape_buffers (drive); |
| idetape_write_header(drive, minor >= 128); |
| idetape_flush_tape_buffers (drive); |
| |
| return; |
| } |
| |
| /* |
| * Our character device release function. |
| */ |
| static int idetape_chrdev_release (struct inode *inode, struct file *filp) |
| { |
| ide_drive_t *drive = get_drive_ptr (inode->i_rdev); |
| idetape_tape_t *tape; |
| idetape_pc_t pc; |
| unsigned int minor=minor(inode->i_rdev); |
| |
| tape = drive->driver_data; |
| #if IDETAPE_DEBUG_LOG |
| if (tape->debug_level >= 3) |
| printk (KERN_INFO "ide-tape: Reached idetape_chrdev_release\n"); |
| #endif /* IDETAPE_DEBUG_LOG */ |
| |
| if (tape->chrdev_direction == idetape_direction_write) { |
| idetape_write_release(inode); |
| } |
| if (tape->chrdev_direction == idetape_direction_read) { |
| if (minor < 128) |
| idetape_discard_read_pipeline (drive, 1); |
| else |
| idetape_wait_for_pipeline (drive); |
| } |
| if (tape->cache_stage != NULL) { |
| __idetape_kfree_stage (tape->cache_stage); |
| tape->cache_stage = NULL; |
| } |
| if (minor < 128) |
| (void) idetape_rewind_tape (drive); |
| if (tape->chrdev_direction == idetape_direction_none) { |
| if (tape->door_locked != DOOR_EXPLICITLY_LOCKED) { |
| if (idetape_create_prevent_cmd(drive, &pc, 0)) |
| if (!idetape_queue_pc_tail (drive, &pc)) |
| tape->door_locked = DOOR_UNLOCKED; |
| } |
| MOD_DEC_USE_COUNT; |
| } |
| clear_bit (IDETAPE_BUSY, &tape->flags); |
| return 0; |
| } |
| |
| /* |
| * idetape_identify_device is called to check the contents of the |
| * ATAPI IDENTIFY command results. We return: |
| * |
| * 1 If the tape can be supported by us, based on the information |
| * we have so far. |
| * |
| * 0 If this tape driver is not currently supported by us. |
| */ |
| static int idetape_identify_device (ide_drive_t *drive,struct hd_driveid *id) |
| { |
| struct idetape_id_gcw gcw; |
| #if IDETAPE_DEBUG_INFO |
| unsigned short mask,i; |
| #endif /* IDETAPE_DEBUG_INFO */ |
| |
| if (!id) |
| return 0; |
| |
| *((unsigned short *) &gcw) = id->config; |
| |
| #if IDETAPE_DEBUG_INFO |
| printk (KERN_INFO "ide-tape: Dumping ATAPI Identify Device tape parameters\n"); |
| printk (KERN_INFO "ide-tape: Protocol Type: "); |
| switch (gcw.protocol) { |
| case 0: case 1: printk (KERN_INFO "ATA\n");break; |
| case 2: printk (KERN_INFO "ATAPI\n");break; |
| case 3: printk (KERN_INFO "Reserved (Unknown to ide-tape)\n");break; |
| } |
| printk (KERN_INFO "ide-tape: Device Type: %x - ",gcw.device_type); |
| switch (gcw.device_type) { |
| case 0: printk (KERN_INFO "Direct-access Device\n");break; |
| case 1: printk (KERN_INFO "Streaming Tape Device\n");break; |
| case 2: case 3: case 4: printk (KERN_INFO "Reserved\n");break; |
| case 5: printk (KERN_INFO "CD-ROM Device\n");break; |
| case 6: printk (KERN_INFO "Reserved\n"); |
| case 7: printk (KERN_INFO "Optical memory Device\n");break; |
| case 0x1f: printk (KERN_INFO "Unknown or no Device type\n");break; |
| default: printk (KERN_INFO "Reserved\n"); |
| } |
| printk (KERN_INFO "ide-tape: Removable: %s",gcw.removable ? "Yes\n":"No\n"); |
| printk (KERN_INFO "ide-tape: Command Packet DRQ Type: "); |
| switch (gcw.drq_type) { |
| case 0: printk (KERN_INFO "Microprocessor DRQ\n");break; |
| case 1: printk (KERN_INFO "Interrupt DRQ\n");break; |
| case 2: printk (KERN_INFO "Accelerated DRQ\n");break; |
| case 3: printk (KERN_INFO "Reserved\n");break; |
| } |
| printk (KERN_INFO "ide-tape: Command Packet Size: "); |
| switch (gcw.packet_size) { |
| case 0: printk (KERN_INFO "12 bytes\n");break; |
| case 1: printk (KERN_INFO "16 bytes\n");break; |
| default: printk (KERN_INFO "Reserved\n");break; |
| } |
| printk (KERN_INFO "ide-tape: Model: %.40s\n",id->model); |
| printk (KERN_INFO "ide-tape: Firmware Revision: %.8s\n",id->fw_rev); |
| printk (KERN_INFO "ide-tape: Serial Number: %.20s\n",id->serial_no); |
| printk (KERN_INFO "ide-tape: Write buffer size: %d bytes\n",id->buf_size*512); |
| printk (KERN_INFO "ide-tape: DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n"); |
| printk (KERN_INFO "ide-tape: LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n"); |
| printk (KERN_INFO "ide-tape: IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n"); |
| printk (KERN_INFO "ide-tape: IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n"); |
| printk (KERN_INFO "ide-tape: ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n"); |
| printk (KERN_INFO "ide-tape: PIO Cycle Timing Category: %d\n",id->tPIO); |
| printk (KERN_INFO "ide-tape: DMA Cycle Timing Category: %d\n",id->tDMA); |
| printk (KERN_INFO "ide-tape: Single Word DMA supported modes: "); |
| for (i=0,mask=1;i<8;i++,mask=mask << 1) { |
| if (id->dma_1word & mask) |
| printk (KERN_INFO "%d ",i); |
| if (id->dma_1word & (mask << 8)) |
| printk (KERN_INFO "(active) "); |
| } |
| printk (KERN_INFO "\n"); |
| printk (KERN_INFO "ide-tape: Multi Word DMA supported modes: "); |
| for (i=0,mask=1;i<8;i++,mask=mask << 1) { |
| if (id->dma_mword & mask) |
| printk (KERN_INFO "%d ",i); |
| if (id->dma_mword & (mask << 8)) |
| printk (KERN_INFO "(active) "); |
| } |
| printk (KERN_INFO "\n"); |
| if (id->field_valid & 0x0002) { |
| printk (KERN_INFO "ide-tape: Enhanced PIO Modes: %s\n",id->eide_pio_modes & 1 ? "Mode 3":"None"); |
| printk (KERN_INFO "ide-tape: Minimum Multi-word DMA cycle per word: "); |
| if (id->eide_dma_min == 0) |
| printk (KERN_INFO "Not supported\n"); |
| else |
| printk (KERN_INFO "%d ns\n",id->eide_dma_min); |
| |
| printk (KERN_INFO "ide-tape: Manufacturer\'s Recommended Multi-word cycle: "); |
| if (id->eide_dma_time == 0) |
| printk (KERN_INFO "Not supported\n"); |
| else |
| printk (KERN_INFO "%d ns\n",id->eide_dma_time); |
| |
| printk (KERN_INFO "ide-tape: Minimum PIO cycle without IORDY: "); |
| if (id->eide_pio == 0) |
| printk (KERN_INFO "Not supported\n"); |
| else |
| printk (KERN_INFO "%d ns\n",id->eide_pio); |
| |
| printk (KERN_INFO "ide-tape: Minimum PIO cycle with IORDY: "); |
| if (id->eide_pio_iordy == 0) |
| printk (KERN_INFO "Not supported\n"); |
| else |
| printk (KERN_INFO "%d ns\n",id->eide_pio_iordy); |
| |
| } else |
| printk (KERN_INFO "ide-tape: According to the device, fields 64-70 are not valid.\n"); |
| #endif /* IDETAPE_DEBUG_INFO */ |
| |
| /* Check that we can support this device */ |
| |
| if (gcw.protocol !=2 ) |
| printk (KERN_ERR "ide-tape: Protocol is not ATAPI\n"); |
| else if (gcw.device_type != 1) |
| printk (KERN_ERR "ide-tape: Device type is not set to tape\n"); |
| else if (!gcw.removable) |
| printk (KERN_ERR "ide-tape: The removable flag is not set\n"); |
| else if (gcw.packet_size != 0) { |
| printk (KERN_ERR "ide-tape: Packet size is not 12 bytes long\n"); |
| if (gcw.packet_size == 1) |
| printk (KERN_ERR "ide-tape: Sorry, padding to 16 bytes is still not supported\n"); |
| } else |
| return 1; |
| return 0; |
| } |
| |
| /* |
| * Notify vendor ID to the OnStream tape drive |
| */ |
| static void idetape_onstream_set_vendor (ide_drive_t *drive, char *vendor) |
| { |
| idetape_pc_t pc; |
| idetape_mode_parameter_header_t *header; |
| |
| idetape_create_mode_select_cmd(&pc, sizeof(*header) + 8); |
| pc.buffer[0] = 3 + 8; /* Mode Data Length */ |
| pc.buffer[1] = 0; /* Medium Type - ignoring */ |
| pc.buffer[2] = 0; /* Reserved */ |
| pc.buffer[3] = 0; /* Block Descriptor Length */ |
| pc.buffer[4 + 0] = 0x36 | (1 << 7); |
| pc.buffer[4 + 1] = 6; |
| pc.buffer[4 + 2] = vendor[0]; |
| pc.buffer[4 + 3] = vendor[1]; |
| pc.buffer[4 + 4] = vendor[2]; |
| pc.buffer[4 + 5] = vendor[3]; |
| pc.buffer[4 + 6] = 0; |
| pc.buffer[4 + 7] = 0; |
| if (idetape_queue_pc_tail (drive, &pc)) |
| printk (KERN_ERR "ide-tape: Couldn't set vendor name to %s\n", vendor); |
| |
| } |
| |
| /* |
| * Various unused OnStream commands |
| */ |
| #if ONSTREAM_DEBUG |
| static void idetape_onstream_set_retries (ide_drive_t *drive, int retries) |
| { |
| idetape_pc_t pc; |
| |
| idetape_create_mode_select_cmd(&pc, sizeof(idetape_mode_parameter_header_t) + 4); |
| pc.buffer[0] = 3 + 4; |
| pc.buffer[1] = 0; /* Medium Type - ignoring */ |
| pc.buffer[2] = 0; /* Reserved */ |
| pc.buffer[3] = 0; /* Block Descriptor Length */ |
| pc.buffer[4 + 0] = 0x2f | (1 << 7); |
| pc.buffer[4 + 1] = 2; |
| pc.buffer[4 + 2] = 4; |
| pc.buffer[4 + 3] = retries; |
| if (idetape_queue_pc_tail (drive, &pc)) |
| printk (KERN_ERR "ide-tape: Couldn't set retries to %d\n", retries); |
| } |
| #endif |
| |
| /* |
| * Configure 32.5KB block size. |
| */ |
| static void idetape_onstream_configure_block_size (ide_drive_t *drive) |
| { |
| idetape_pc_t pc; |
| idetape_mode_parameter_header_t *header; |
| idetape_block_size_page_t *bs; |
| |
| /* |
| * Get the current block size from the block size mode page |
| */ |
| idetape_create_mode_sense_cmd (&pc, IDETAPE_BLOCK_SIZE_PAGE); |
| if (idetape_queue_pc_tail (drive, &pc)) |
| printk (KERN_ERR "ide-tape: can't get tape block size mode page\n"); |
| header = (idetape_mode_parameter_header_t *) pc.buffer; |
| bs = (idetape_block_size_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); |
| |
| #if IDETAPE_DEBUG_INFO |
| printk(KERN_INFO "ide-tape: 32KB play back: %s\n", bs->play32 ? "Yes" : "No"); |
| printk(KERN_INFO "ide-tape: 32.5KB play back: %s\n", bs->play32_5 ? "Yes" : "No"); |
| printk(KERN_INFO "ide-tape: 32KB record: %s\n", bs->record32 ? "Yes" : "No"); |
| printk(KERN_INFO "ide-tape: 32.5KB record: %s\n", bs->record32_5 ? "Yes" : "No"); |
| #endif /* IDETAPE_DEBUG_INFO */ |
| |
| /* |
| * Configure default auto columns mode, 32.5KB block size |
| */ |
| bs->one = 1; |
| bs->play32 = 0; |
| bs->play32_5 = 1; |
| bs->record32 = 0; |
| bs->record32_5 = 1; |
| idetape_create_mode_select_cmd(&pc, sizeof(*header) + sizeof(*bs)); |
| if (idetape_queue_pc_tail (drive, &pc)) |
| printk (KERN_ERR "ide-tape: Couldn't set tape block size mode page\n"); |
| |
| #if ONSTREAM_DEBUG |
| /* |
| * In debug mode, we want to see as many errors as possible |
| * to test the error recovery mechanism. |
| */ |
| idetape_onstream_set_retries(drive, 0); |
| #endif |
| } |
| |
| /* |
| * Use INQUIRY to get the firmware revision |
| */ |
| static void idetape_get_inquiry_results (ide_drive_t *drive) |
| { |
| char *r; |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t pc; |
| idetape_inquiry_result_t *inquiry; |
| |
| idetape_create_inquiry_cmd(&pc); |
| if (idetape_queue_pc_tail (drive, &pc)) { |
| printk (KERN_ERR "ide-tape: %s: can't get INQUIRY results\n", tape->name); |
| return; |
| } |
| inquiry = (idetape_inquiry_result_t *) pc.buffer; |
| memcpy(tape->vendor_id, inquiry->vendor_id, 8); |
| memcpy(tape->product_id, inquiry->product_id, 16); |
| memcpy(tape->firmware_revision, inquiry->revision_level, 4); |
| ide_fixstring(tape->vendor_id, 10, 0); |
| ide_fixstring(tape->product_id, 18, 0); |
| ide_fixstring(tape->firmware_revision, 6, 0); |
| r = tape->firmware_revision; |
| if (*(r + 1) == '.') |
| tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 2) - '0') * 10 + *(r + 3) - '0'; |
| else if (tape->onstream) |
| tape->firmware_revision_num = (*r - '0') * 100 + (*(r + 1) - '0') * 10 + *(r + 2) - '0'; |
| printk(KERN_INFO "ide-tape: %s <-> %s: %s %s rev %s\n", drive->name, tape->name, tape->vendor_id, tape->product_id, tape->firmware_revision); |
| } |
| |
| /* |
| * Configure the OnStream ATAPI tape drive for default operation |
| */ |
| static void idetape_configure_onstream (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| if (tape->firmware_revision_num < 105) { |
| printk(KERN_INFO "ide-tape: %s: Old OnStream firmware revision detected (%s)\n", tape->name, tape->firmware_revision); |
| printk(KERN_INFO "ide-tape: %s: An upgrade to version 1.05 or above is recommended\n", tape->name); |
| } |
| |
| /* |
| * Configure 32.5KB (data+aux) block size. |
| */ |
| idetape_onstream_configure_block_size(drive); |
| |
| /* |
| * Set vendor name to 'LIN3' for "Linux support version 3". |
| */ |
| idetape_onstream_set_vendor(drive, "LIN3"); |
| } |
| |
| /* |
| * idetape_get_mode_sense_parameters asks the tape about its various |
| * parameters. This may work for other drives to??? |
| */ |
| static void idetape_onstream_mode_sense_tape_parameter_page(ide_drive_t *drive, int debug) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t pc; |
| idetape_mode_parameter_header_t *header; |
| onstream_tape_paramtr_page_t *prm; |
| |
| idetape_create_mode_sense_cmd (&pc, IDETAPE_PARAMTR_PAGE); |
| if (idetape_queue_pc_tail (drive, &pc)) { |
| printk (KERN_ERR "ide-tape: Can't get tape parameters page - probably no tape inserted in onstream drive\n"); |
| return; |
| } |
| header = (idetape_mode_parameter_header_t *) pc.buffer; |
| prm = (onstream_tape_paramtr_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); |
| |
| tape->capacity = ntohs(prm->segtrk) * ntohs(prm->trks); |
| if (debug) { |
| printk (KERN_INFO "ide-tape: %s <-> %s: Tape length %dMB (%d frames/track, %d tracks = %d blocks, density: %dKbpi)\n", |
| drive->name, tape->name, tape->capacity/32, ntohs(prm->segtrk), ntohs(prm->trks), tape->capacity, prm->density); |
| } |
| |
| return; |
| } |
| |
| /* |
| * idetape_get_mode_sense_results asks the tape about its various |
| * parameters. In particular, we will adjust our data transfer buffer |
| * size to the recommended value as returned by the tape. |
| */ |
| static void idetape_get_mode_sense_results (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t pc; |
| idetape_mode_parameter_header_t *header; |
| idetape_capabilities_page_t *capabilities; |
| |
| idetape_create_mode_sense_cmd (&pc, IDETAPE_CAPABILITIES_PAGE); |
| if (idetape_queue_pc_tail (drive, &pc)) { |
| printk (KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n"); |
| tape->tape_block_size = 512; tape->capabilities.ctl = 52; |
| tape->capabilities.speed = 450; tape->capabilities.buffer_size = 6 * 52; |
| return; |
| } |
| header = (idetape_mode_parameter_header_t *) pc.buffer; |
| capabilities = (idetape_capabilities_page_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t) + header->bdl); |
| |
| capabilities->max_speed = ntohs (capabilities->max_speed); |
| capabilities->ctl = ntohs (capabilities->ctl); |
| capabilities->speed = ntohs (capabilities->speed); |
| capabilities->buffer_size = ntohs (capabilities->buffer_size); |
| |
| if (!capabilities->speed) { |
| printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name); |
| capabilities->speed = 650; |
| } |
| if (!capabilities->max_speed) { |
| printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name); |
| capabilities->max_speed = 650; |
| } |
| |
| tape->capabilities = *capabilities; /* Save us a copy */ |
| if (capabilities->blk512) |
| tape->tape_block_size = 512; |
| else if (capabilities->blk1024) |
| tape->tape_block_size = 1024; |
| else if (tape->onstream && capabilities->blk32768) |
| tape->tape_block_size = 32768; |
| |
| #if IDETAPE_DEBUG_INFO |
| printk (KERN_INFO "ide-tape: Dumping the results of the MODE SENSE packet command\n"); |
| printk (KERN_INFO "ide-tape: Mode Parameter Header:\n"); |
| printk (KERN_INFO "ide-tape: Mode Data Length - %d\n",header->mode_data_length); |
| printk (KERN_INFO "ide-tape: Medium Type - %d\n",header->medium_type); |
| printk (KERN_INFO "ide-tape: Device Specific Parameter - %d\n",header->dsp); |
| printk (KERN_INFO "ide-tape: Block Descriptor Length - %d\n",header->bdl); |
| |
| printk (KERN_INFO "ide-tape: Capabilities and Mechanical Status Page:\n"); |
| printk (KERN_INFO "ide-tape: Page code - %d\n",capabilities->page_code); |
| printk (KERN_INFO "ide-tape: Page length - %d\n",capabilities->page_length); |
| printk (KERN_INFO "ide-tape: Read only - %s\n",capabilities->ro ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports reverse space - %s\n",capabilities->sprev ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports erase initiated formatting - %s\n",capabilities->efmt ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports QFA two Partition format - %s\n",capabilities->qfa ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports locking the medium - %s\n",capabilities->lock ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: The volume is currently locked - %s\n",capabilities->locked ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: The device defaults in the prevent state - %s\n",capabilities->prevent ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports ejecting the medium - %s\n",capabilities->eject ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports error correction - %s\n",capabilities->ecc ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports data compression - %s\n",capabilities->cmprs ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports 512 bytes block size - %s\n",capabilities->blk512 ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports 1024 bytes block size - %s\n",capabilities->blk1024 ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Supports 32768 bytes block size / Restricted byte count for PIO transfers - %s\n",capabilities->blk32768 ? "Yes":"No"); |
| printk (KERN_INFO "ide-tape: Maximum supported speed in KBps - %d\n",capabilities->max_speed); |
| printk (KERN_INFO "ide-tape: Continuous transfer limits in blocks - %d\n",capabilities->ctl); |
| printk (KERN_INFO "ide-tape: Current speed in KBps - %d\n",capabilities->speed); |
| printk (KERN_INFO "ide-tape: Buffer size - %d\n",capabilities->buffer_size*512); |
| #endif /* IDETAPE_DEBUG_INFO */ |
| } |
| |
| /* |
| * ide_get_blocksize_from_block_descriptor does a mode sense page 0 with block descriptor |
| * and if it succeeds sets the tape block size with the reported value |
| */ |
| static void idetape_get_blocksize_from_block_descriptor(ide_drive_t *drive) |
| { |
| |
| idetape_tape_t *tape = drive->driver_data; |
| idetape_pc_t pc; |
| idetape_mode_parameter_header_t *header; |
| idetape_parameter_block_descriptor_t *block_descrp; |
| |
| idetape_create_mode_sense_cmd (&pc, IDETAPE_BLOCK_DESCRIPTOR); |
| if (idetape_queue_pc_tail (drive, &pc)) { |
| printk (KERN_ERR "ide-tape: Can't get block descriptor\n"); |
| if (tape->tape_block_size == 0) { |
| printk(KERN_WARNING "ide-tape: Cannot deal with zero block size, assume 32k\n"); |
| tape->tape_block_size = 32768; |
| } |
| return; |
| } |
| header = (idetape_mode_parameter_header_t *) pc.buffer; |
| block_descrp = (idetape_parameter_block_descriptor_t *) (pc.buffer + sizeof(idetape_mode_parameter_header_t)); |
| tape->tape_block_size =( block_descrp->length[0]<<16) + (block_descrp->length[1]<<8) + block_descrp->length[2]; |
| #if IDETAPE_DEBUG_INFO |
| printk (KERN_INFO "ide-tape: Adjusted block size - %d\n", tape->tape_block_size); |
| #endif /* IDETAPE_DEBUG_INFO */ |
| } |
| static void idetape_add_settings (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| |
| /* |
| * drive setting name read/write ioctl ioctl data type min max mul_factor div_factor data pointer set function |
| */ |
| ide_add_setting(drive, "buffer", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL); |
| ide_add_setting(drive, "pipeline_min", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->min_pipeline, NULL); |
| ide_add_setting(drive, "pipeline", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->max_stages, NULL); |
| ide_add_setting(drive, "pipeline_max", SETTING_RW, -1, -1, TYPE_INT, 2, 0xffff, tape->stage_size / 1024, 1, &tape->max_pipeline, NULL); |
| ide_add_setting(drive, "pipeline_used",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages, NULL); |
| ide_add_setting(drive, "pipeline_pending",SETTING_READ,-1, -1, TYPE_INT, 0, 0xffff, tape->stage_size / 1024, 1, &tape->nr_pending_stages, NULL); |
| ide_add_setting(drive, "speed", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->capabilities.speed, NULL); |
| ide_add_setting(drive, "stage", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1024, &tape->stage_size, NULL); |
| ide_add_setting(drive, "tdsc", SETTING_RW, -1, -1, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL); |
| ide_add_setting(drive, "dsc_overlap", SETTING_RW, -1, -1, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL); |
| ide_add_setting(drive, "pipeline_head_speed_c",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->controlled_pipeline_head_speed, NULL); |
| ide_add_setting(drive, "pipeline_head_speed_u",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->uncontrolled_pipeline_head_speed, NULL); |
| ide_add_setting(drive, "avg_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->avg_speed, NULL); |
| ide_add_setting(drive, "debug_level",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->debug_level, NULL); |
| if (tape->onstream) { |
| ide_add_setting(drive, "cur_frames", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->cur_frames, NULL); |
| ide_add_setting(drive, "max_frames", SETTING_READ, -1, -1, TYPE_SHORT, 0, 0xffff, 1, 1, &tape->max_frames, NULL); |
| ide_add_setting(drive, "insert_speed", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->insert_speed, NULL); |
| ide_add_setting(drive, "speed_control",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->speed_control, NULL); |
| ide_add_setting(drive, "tape_still_time",SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->tape_still_time, NULL); |
| ide_add_setting(drive, "max_insert_speed",SETTING_RW, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->max_insert_speed, NULL); |
| ide_add_setting(drive, "insert_size", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->insert_size, NULL); |
| ide_add_setting(drive, "capacity", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->capacity, NULL); |
| ide_add_setting(drive, "first_frame", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->first_frame_position, NULL); |
| ide_add_setting(drive, "logical_blk", SETTING_READ, -1, -1, TYPE_INT, 0, 0xffff, 1, 1, &tape->logical_blk_num, NULL); |
| } |
| } |
| |
| /* |
| * ide_setup is called to: |
| * |
| * 1. Initialize our various state variables. |
| * 2. Ask the tape for its capabilities. |
| * 3. Allocate a buffer which will be used for data |
| * transfer. The buffer size is chosen based on |
| * the recommendation which we received in step (2). |
| * |
| * Note that at this point ide.c already assigned us an irq, so that |
| * we can queue requests here and wait for their completion. |
| */ |
| static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor) |
| { |
| unsigned long t1, tmid, tn, t; |
| int speed; |
| struct idetape_id_gcw gcw; |
| int stage_size; |
| struct sysinfo si; |
| |
| memset (tape, 0, sizeof (idetape_tape_t)); |
| spin_lock_init(&tape->spinlock); |
| drive->driver_data = tape; |
| drive->ready_stat = 0; /* An ATAPI device ignores DRDY */ |
| if (strstr(drive->id->model, "OnStream DI-")) |
| tape->onstream = 1; |
| drive->dsc_overlap = 1; |
| #ifdef CONFIG_BLK_DEV_IDEPCI |
| if (!tape->onstream && drive->channel->pci_dev != NULL) { |
| /* |
| * These two ide-pci host adapters appear to need DSC overlap disabled. |
| * This probably needs further analysis. |
| */ |
| if ((drive->channel->pci_dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) || |
| (drive->channel->pci_dev->device == PCI_DEVICE_ID_TTI_HPT343)) { |
| printk(KERN_INFO "ide-tape: %s: disabling DSC overlap\n", tape->name); |
| drive->dsc_overlap = 0; |
| } |
| } |
| #endif /* CONFIG_BLK_DEV_IDEPCI */ |
| tape->drive = drive; |
| tape->minor = minor; |
| tape->name[0] = 'h'; tape->name[1] = 't'; tape->name[2] = '0' + minor; |
| tape->chrdev_direction = idetape_direction_none; |
| tape->pc = tape->pc_stack; |
| tape->max_insert_speed = 10000; |
| tape->speed_control = 1; |
| *((unsigned short *) &gcw) = drive->id->config; |
| if (gcw.drq_type == 1) |
| set_bit(IDETAPE_DRQ_INTERRUPT, &tape->flags); |
| |
| tape->min_pipeline = tape->max_pipeline = tape->max_stages = 10; |
| |
| idetape_get_inquiry_results(drive); |
| idetape_get_mode_sense_results(drive); |
| idetape_get_blocksize_from_block_descriptor(drive); |
| if (tape->onstream) { |
| idetape_onstream_mode_sense_tape_parameter_page(drive, 1); |
| idetape_configure_onstream(drive); |
| } |
| tape->user_bs_factor = 1; |
| tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; |
| while (tape->stage_size > 0xffff) { |
| printk (KERN_NOTICE "ide-tape: decreasing stage size\n"); |
| tape->capabilities.ctl /= 2; |
| tape->stage_size = tape->capabilities.ctl * tape->tape_block_size; |
| } |
| stage_size = tape->stage_size; |
| if (tape->onstream) |
| stage_size = 32768 + 512; |
| tape->pages_per_stage = stage_size / PAGE_SIZE; |
| if (stage_size % PAGE_SIZE) { |
| tape->pages_per_stage++; |
| tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE; |
| } |
| |
| /* |
| * Select the "best" DSC read/write polling frequency |
| * and pipeline size. |
| */ |
| speed = max(tape->capabilities.speed, tape->capabilities.max_speed); |
| |
| tape->max_stages = speed * 1000 * 10 / tape->stage_size; |
| |
| /* |
| * Limit memory use for pipeline to 10% of physical memory |
| */ |
| si_meminfo(&si); |
| if ( tape->max_stages * tape->stage_size > si.totalram * si.mem_unit / 10) |
| tape->max_stages = si.totalram * si.mem_unit / (10 * tape->stage_size); |
| tape->min_pipeline = tape->max_stages; |
| tape->max_pipeline = tape->max_stages * 2; |
| |
| t1 = (tape->stage_size * HZ) / (speed * 1000); |
| tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125); |
| tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000); |
| |
| if (tape->max_stages) |
| t = tn; |
| else |
| t = t1; |
| |
| /* |
| * Ensure that the number we got makes sense; limit |
| * it within IDETAPE_DSC_RW_MIN and IDETAPE_DSC_RW_MAX. |
| */ |
| tape->best_dsc_rw_frequency = max(min(t, IDETAPE_DSC_RW_MAX), IDETAPE_DSC_RW_MIN); |
| printk (KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, %dkB pipeline, %lums tDSC%s\n", |
| drive->name, tape->name, tape->capabilities.speed, (tape->capabilities.buffer_size * 512) / tape->stage_size, |
| tape->stage_size / 1024, tape->max_stages * tape->stage_size / 1024, |
| tape->best_dsc_rw_frequency * 1000 / HZ, drive->using_dma ? ", DMA":""); |
| |
| idetape_add_settings(drive); |
| } |
| |
| static int idetape_cleanup (ide_drive_t *drive) |
| { |
| idetape_tape_t *tape = drive->driver_data; |
| int minor = tape->minor; |
| unsigned long flags; |
| |
| save_flags (flags); /* all CPUs (overkill?) */ |
| cli(); /* all CPUs (overkill?) */ |
| if (test_bit (IDETAPE_BUSY, &tape->flags) || tape->first_stage != NULL || tape->merge_stage_size || drive->usage) { |
| restore_flags(flags); /* all CPUs (overkill?) */ |
| return 1; |
| } |
| idetape_chrdevs[minor].drive = NULL; |
| restore_flags (flags); /* all CPUs (overkill?) */ |
| |
| MOD_DEC_USE_COUNT; |
| |
| ide_unregister_subdriver (drive); |
| drive->driver_data = NULL; |
| devfs_unregister (tape->de_r); |
| devfs_unregister (tape->de_n); |
| kfree (tape); |
| for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++) |
| if (idetape_chrdevs[minor].drive != NULL) |
| return 0; |
| devfs_unregister_chrdev (IDETAPE_MAJOR, "ht"); |
| idetape_chrdev_present = 0; |
| return 0; |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| |
| static int proc_idetape_read_name |
| (char *page, char **start, off_t off, int count, int *eof, void *data) |
| { |
| ide_drive_t *drive = (ide_drive_t *) data; |
| idetape_tape_t *tape = drive->driver_data; |
| char *out = page; |
| int len; |
| |
| len = sprintf(out, "%s\n", tape->name); |
| PROC_IDE_READ_RETURN(page, start, off, count, eof, len); |
| } |
| |
| static ide_proc_entry_t idetape_proc[] = { |
| { "name", S_IFREG|S_IRUGO, proc_idetape_read_name, NULL }, |
| { NULL, 0, NULL, NULL } |
| }; |
| |
| #else |
| |
| #define idetape_proc NULL |
| |
| #endif |
| |
| static void idetape_revalidate(ide_drive_t *_dummy) |
| { |
| /* We don't have to handle any partition information here, which is the |
| * default behaviour of this method. |
| */ |
| } |
| |
| /* |
| * IDE subdriver functions, registered with ide.c |
| */ |
| static struct ata_operations idetape_driver = { |
| owner: THIS_MODULE, |
| cleanup: idetape_cleanup, |
| standby: NULL, |
| do_request: idetape_do_request, |
| end_request: idetape_end_request, |
| ioctl: idetape_blkdev_ioctl, |
| open: idetape_blkdev_open, |
| release: idetape_blkdev_release, |
| check_media_change: NULL, |
| revalidate: idetape_revalidate, |
| pre_reset: idetape_pre_reset, |
| capacity: NULL, |
| proc: idetape_proc |
| }; |
| |
| /* |
| * Our character device supporting functions, passed to register_chrdev. |
| */ |
| static struct file_operations idetape_fops = { |
| owner: THIS_MODULE, |
| read: idetape_chrdev_read, |
| write: idetape_chrdev_write, |
| ioctl: idetape_chrdev_ioctl, |
| open: idetape_chrdev_open, |
| release: idetape_chrdev_release, |
| }; |
| |
| MODULE_DESCRIPTION("ATAPI Streaming TAPE Driver"); |
| MODULE_LICENSE("GPL"); |
| |
| static void __exit idetape_exit (void) |
| { |
| ide_drive_t *drive; |
| int minor; |
| |
| for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++) { |
| drive = idetape_chrdevs[minor].drive; |
| if (drive != NULL && idetape_cleanup (drive)) |
| printk (KERN_ERR "ide-tape: %s: cleanup_module() called while still busy\n", drive->name); |
| } |
| } |
| |
| /* |
| * idetape_init will register the driver for each tape. |
| */ |
| int idetape_init (void) |
| { |
| ide_drive_t *drive; |
| idetape_tape_t *tape; |
| int minor, failed = 0, supported = 0; |
| /* DRIVER(drive)->busy++; */ |
| MOD_INC_USE_COUNT; |
| #if ONSTREAM_DEBUG |
| printk(KERN_INFO "ide-tape: MOD_INC_USE_COUNT in idetape_init\n"); |
| #endif |
| if (!idetape_chrdev_present) |
| for (minor = 0; minor < MAX_HWIFS * MAX_DRIVES; minor++ ) |
| idetape_chrdevs[minor].drive = NULL; |
| |
| if ((drive = ide_scan_devices(ATA_TAPE, "ide-tape", NULL, failed++)) == NULL) { |
| revalidate_drives(); |
| MOD_DEC_USE_COUNT; |
| #if ONSTREAM_DEBUG |
| printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); |
| #endif |
| return 0; |
| } |
| if (!idetape_chrdev_present && |
| devfs_register_chrdev (IDETAPE_MAJOR, "ht", &idetape_fops)) { |
| printk (KERN_ERR "ide-tape: Failed to register character device interface\n"); |
| MOD_DEC_USE_COUNT; |
| #if ONSTREAM_DEBUG |
| printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); |
| #endif |
| return -EBUSY; |
| } |
| do { |
| if (!idetape_identify_device (drive, drive->id)) { |
| printk (KERN_ERR "ide-tape: %s: not supported by this version of ide-tape\n", drive->name); |
| continue; |
| } |
| if (drive->scsi) { |
| if (strstr(drive->id->model, "OnStream DI-")) { |
| printk("ide-tape: ide-scsi emulation is not supported for %s.\n", drive->id->model); |
| } else { |
| printk("ide-tape: passing drive %s to ide-scsi emulation.\n", drive->name); |
| continue; |
| } |
| } |
| tape = (idetape_tape_t *) kmalloc (sizeof (idetape_tape_t), GFP_KERNEL); |
| if (tape == NULL) { |
| printk (KERN_ERR "ide-tape: %s: Can't allocate a tape structure\n", drive->name); |
| continue; |
| } |
| if (ide_register_subdriver (drive, &idetape_driver)) { |
| printk (KERN_ERR "ide-tape: %s: Failed to register the driver with ide.c\n", drive->name); |
| kfree (tape); |
| continue; |
| } |
| for (minor = 0; idetape_chrdevs[minor].drive != NULL; minor++); |
| idetape_setup (drive, tape, minor); |
| idetape_chrdevs[minor].drive = drive; |
| tape->de_r = |
| devfs_register (drive->de, "mt", DEVFS_FL_DEFAULT, |
| drive->channel->major, minor, |
| S_IFCHR | S_IRUGO | S_IWUGO, |
| &idetape_fops, NULL); |
| tape->de_n = |
| devfs_register (drive->de, "mtn", DEVFS_FL_DEFAULT, |
| drive->channel->major, minor + 128, |
| S_IFCHR | S_IRUGO | S_IWUGO, |
| &idetape_fops, NULL); |
| devfs_register_tape (tape->de_r); |
| supported++; failed--; |
| } while ((drive = ide_scan_devices(ATA_TAPE, "ide-tape", NULL, failed++)) != NULL); |
| if (!idetape_chrdev_present && !supported) { |
| devfs_unregister_chrdev (IDETAPE_MAJOR, "ht"); |
| } else |
| idetape_chrdev_present = 1; |
| revalidate_drives(); |
| MOD_DEC_USE_COUNT; |
| #if ONSTREAM_DEBUG |
| printk(KERN_INFO "ide-tape: MOD_DEC_USE_COUNT in idetape_init\n"); |
| #endif |
| return 0; |
| } |
| |
| module_init(idetape_init); |
| module_exit(idetape_exit); |