| /* |
| * linux/drivers/scsi/ide-scsi.c Version 0.9 Jul 4, 1999 |
| * |
| * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il> |
| */ |
| |
| /* |
| * Emulation of a SCSI host adapter for IDE ATAPI devices. |
| * |
| * With this driver, one can use the Linux SCSI drivers instead of the |
| * native IDE ATAPI drivers. |
| * |
| * Ver 0.1 Dec 3 96 Initial version. |
| * Ver 0.2 Jan 26 97 Fixed bug in cleanup_module() and added emulation |
| * of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks |
| * to Janos Farkas for pointing this out. |
| * Avoid using bitfields in structures for m68k. |
| * Added Scatter/Gather and DMA support. |
| * Ver 0.4 Dec 7 97 Add support for ATAPI PD/CD drives. |
| * Use variable timeout for each command. |
| * Ver 0.5 Jan 2 98 Fix previous PD/CD support. |
| * Allow disabling of SCSI-6 to SCSI-10 transformation. |
| * Ver 0.6 Jan 27 98 Allow disabling of SCSI command translation layer |
| * for access through /dev/sg. |
| * Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation. |
| * Ver 0.7 Dec 04 98 Ignore commands where lun != 0 to avoid multiple |
| * detection of devices with CONFIG_SCSI_MULTI_LUN |
| * Ver 0.8 Feb 05 99 Optical media need translation too. Reverse 0.7. |
| * Ver 0.9 Jul 04 99 Fix a bug in SG_SET_TRANSFORM. |
| */ |
| |
| #define IDESCSI_VERSION "0.9" |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/ioport.h> |
| #include <linux/blkdev.h> |
| #include <linux/errno.h> |
| #include <linux/hdreg.h> |
| #include <linux/slab.h> |
| #include <linux/ide.h> |
| |
| #include <asm/io.h> |
| #include <asm/bitops.h> |
| #include <asm/uaccess.h> |
| |
| #include "scsi.h" |
| #include "hosts.h" |
| #include "sd.h" |
| #include <scsi/sg.h> |
| |
| #define IDESCSI_DEBUG_LOG 0 |
| |
| typedef struct idescsi_pc_s { |
| u8 c[12]; /* Actual packet bytes */ |
| int request_transfer; /* Bytes to transfer */ |
| int actually_transferred; /* Bytes actually transferred */ |
| int buffer_size; /* Size of our data buffer */ |
| struct request *rq; /* The corresponding request */ |
| byte *buffer; /* Data buffer */ |
| byte *current_position; /* Pointer into the above buffer */ |
| struct scatterlist *sg; /* Scatter gather table */ |
| int b_count; /* Bytes transferred from current entry */ |
| Scsi_Cmnd *scsi_cmd; /* SCSI command */ |
| void (*done)(Scsi_Cmnd *); /* Scsi completion routine */ |
| unsigned long flags; /* Status/Action flags */ |
| unsigned long timeout; /* Command timeout */ |
| } idescsi_pc_t; |
| |
| /* |
| * Packet command status bits. |
| */ |
| #define PC_DMA_IN_PROGRESS 0 /* 1 while DMA in progress */ |
| #define PC_WRITING 1 /* Data direction */ |
| #define PC_TRANSFORM 2 /* transform SCSI commands */ |
| |
| /* |
| * SCSI command transformation layer |
| */ |
| #define IDESCSI_TRANSFORM 0 /* Enable/Disable transformation */ |
| #define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */ |
| |
| /* |
| * Log flags |
| */ |
| #define IDESCSI_LOG_CMD 0 /* Log SCSI commands */ |
| |
| typedef struct { |
| ide_drive_t *drive; |
| idescsi_pc_t *pc; /* Current packet command */ |
| unsigned long flags; /* Status/Action flags */ |
| unsigned long transform; /* SCSI cmd translation layer */ |
| unsigned long log; /* log flags */ |
| } idescsi_scsi_t; |
| |
| /* |
| * Per ATAPI device status bits. |
| */ |
| #define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */ |
| |
| /* |
| * ide-scsi requests. |
| */ |
| #define IDESCSI_PC_RQ 90 |
| |
| /* |
| * Bits of the interrupt reason register. |
| */ |
| #define IDESCSI_IREASON_COD 0x1 /* Information transferred is command */ |
| #define IDESCSI_IREASON_IO 0x2 /* The device requests us to read */ |
| |
| static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount) |
| { |
| while (bcount--) |
| IN_BYTE (IDE_DATA_REG); |
| } |
| |
| static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount) |
| { |
| while (bcount--) |
| OUT_BYTE (0, IDE_DATA_REG); |
| } |
| |
| /* |
| * PIO data transfer routines using the scatter gather table. |
| */ |
| static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount) |
| { |
| int count; |
| char *buf; |
| |
| while (bcount) { |
| if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) { |
| printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n"); |
| idescsi_discard_data (drive, bcount); |
| return; |
| } |
| count = IDE_MIN (pc->sg->length - pc->b_count, bcount); |
| buf = page_address(pc->sg->page) + pc->sg->offset; |
| atapi_input_bytes (drive, buf + pc->b_count, count); |
| bcount -= count; pc->b_count += count; |
| if (pc->b_count == pc->sg->length) { |
| pc->sg++; |
| pc->b_count = 0; |
| } |
| } |
| } |
| |
| static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount) |
| { |
| int count; |
| char *buf; |
| |
| while (bcount) { |
| if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) { |
| printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n"); |
| idescsi_output_zeros (drive, bcount); |
| return; |
| } |
| count = IDE_MIN (pc->sg->length - pc->b_count, bcount); |
| buf = page_address(pc->sg->page) + pc->sg->offset; |
| atapi_output_bytes (drive, buf + pc->b_count, count); |
| bcount -= count; pc->b_count += count; |
| if (pc->b_count == pc->sg->length) { |
| pc->sg++; |
| pc->b_count = 0; |
| } |
| } |
| } |
| |
| /* |
| * Most of the SCSI commands are supported directly by ATAPI devices. |
| * idescsi_transform_pc handles the few exceptions. |
| */ |
| static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc) |
| { |
| u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd; |
| char *atapi_buf; |
| |
| if (!test_bit(PC_TRANSFORM, &pc->flags)) |
| return; |
| if (drive->media == ide_cdrom || drive->media == ide_optical) { |
| if (c[0] == READ_6 || c[0] == WRITE_6) { |
| c[8] = c[4]; c[5] = c[3]; c[4] = c[2]; |
| c[3] = c[1] & 0x1f; c[2] = 0; c[1] &= 0xe0; |
| c[0] += (READ_10 - READ_6); |
| } |
| if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) { |
| if (!scsi_buf) |
| return; |
| if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL) |
| return; |
| memset(atapi_buf, 0, pc->buffer_size + 4); |
| memset (c, 0, 12); |
| c[0] = sc[0] | 0x40; c[1] = sc[1]; c[2] = sc[2]; |
| c[8] = sc[4] + 4; c[9] = sc[5]; |
| if (sc[4] + 4 > 255) |
| c[7] = sc[4] + 4 - 255; |
| if (c[0] == MODE_SELECT_10) { |
| atapi_buf[1] = scsi_buf[0]; /* Mode data length */ |
| atapi_buf[2] = scsi_buf[1]; /* Medium type */ |
| atapi_buf[3] = scsi_buf[2]; /* Device specific parameter */ |
| atapi_buf[7] = scsi_buf[3]; /* Block descriptor length */ |
| memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4); |
| } |
| pc->buffer = atapi_buf; |
| pc->request_transfer += 4; |
| pc->buffer_size += 4; |
| } |
| } |
| } |
| |
| static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc) |
| { |
| u8 *atapi_buf = pc->buffer; |
| u8 *sc = pc->scsi_cmd->cmnd; |
| u8 *scsi_buf = pc->scsi_cmd->request_buffer; |
| |
| if (!test_bit(PC_TRANSFORM, &pc->flags)) |
| return; |
| if (drive->media == ide_cdrom || drive->media == ide_optical) { |
| if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) { |
| scsi_buf[0] = atapi_buf[1]; /* Mode data length */ |
| scsi_buf[1] = atapi_buf[2]; /* Medium type */ |
| scsi_buf[2] = atapi_buf[3]; /* Device specific parameter */ |
| scsi_buf[3] = atapi_buf[7]; /* Block descriptor length */ |
| memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8); |
| } |
| if (pc->c[0] == INQUIRY) { |
| scsi_buf[2] |= 2; /* ansi_revision */ |
| scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */ |
| } |
| } |
| if (atapi_buf && atapi_buf != scsi_buf) |
| kfree(atapi_buf); |
| } |
| |
| static inline void idescsi_free_bio (struct bio *bio) |
| { |
| struct bio *bhp; |
| |
| while (bio) { |
| bhp = bio; |
| bio = bio->bi_next; |
| bio_put(bhp); |
| } |
| } |
| |
| static void hexdump(u8 *x, int len) |
| { |
| int i; |
| |
| printk("[ "); |
| for (i = 0; i < len; i++) |
| printk("%x ", x[i]); |
| printk("]\n"); |
| } |
| |
| static void idescsi_end_request (byte uptodate, ide_hwgroup_t *hwgroup) |
| { |
| ide_drive_t *drive = hwgroup->drive; |
| idescsi_scsi_t *scsi = drive->driver_data; |
| struct request *rq = hwgroup->rq; |
| idescsi_pc_t *pc = (idescsi_pc_t *) rq->special; |
| int log = test_bit(IDESCSI_LOG_CMD, &scsi->log); |
| struct Scsi_Host *host; |
| u8 *scsi_buf; |
| unsigned long flags; |
| |
| if (!(rq->flags & REQ_SPECIAL)) { |
| ide_end_request (uptodate, hwgroup); |
| return; |
| } |
| ide_end_drive_cmd (drive, 0, 0); |
| if (rq->errors >= ERROR_MAX) { |
| pc->scsi_cmd->result = DID_ERROR << 16; |
| if (log) |
| printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number); |
| } else if (rq->errors) { |
| pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16); |
| if (log) |
| printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number); |
| } else { |
| pc->scsi_cmd->result = DID_OK << 16; |
| idescsi_transform_pc2 (drive, pc); |
| if (log) { |
| printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number); |
| if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) { |
| printk(", rst = "); |
| scsi_buf = pc->scsi_cmd->request_buffer; |
| hexdump(scsi_buf, IDE_MIN(16, pc->scsi_cmd->request_bufflen)); |
| } else printk("\n"); |
| } |
| } |
| host = pc->scsi_cmd->host; |
| spin_lock_irqsave(host->host_lock, flags); |
| pc->done(pc->scsi_cmd); |
| spin_unlock_irqrestore(host->host_lock, flags); |
| idescsi_free_bio (rq->bio); |
| kfree(pc); kfree(rq); |
| scsi->pc = NULL; |
| } |
| |
| static inline unsigned long get_timeout(idescsi_pc_t *pc) |
| { |
| return IDE_MAX(WAIT_CMD, pc->timeout - jiffies); |
| } |
| |
| /* |
| * Our interrupt handler. |
| */ |
| static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive) |
| { |
| idescsi_scsi_t *scsi = drive->driver_data; |
| byte status, ireason; |
| int bcount; |
| idescsi_pc_t *pc=scsi->pc; |
| struct request *rq = pc->rq; |
| unsigned int temp; |
| |
| #if IDESCSI_DEBUG_LOG |
| printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n"); |
| #endif /* IDESCSI_DEBUG_LOG */ |
| |
| if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) { |
| #if IDESCSI_DEBUG_LOG |
| printk ("ide-scsi: %s: DMA complete\n", drive->name); |
| #endif /* IDESCSI_DEBUG_LOG */ |
| pc->actually_transferred=pc->request_transfer; |
| (void) (HWIF(drive)->dmaproc(ide_dma_end, drive)); |
| } |
| |
| status = GET_STAT(); /* Clear the interrupt */ |
| |
| if ((status & DRQ_STAT) == 0) { /* No more interrupts */ |
| if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) |
| printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred); |
| ide__sti(); |
| if (status & ERR_STAT) |
| rq->errors++; |
| idescsi_end_request (1, HWGROUP(drive)); |
| return ide_stopped; |
| } |
| bcount = IN_BYTE (IDE_BCOUNTH_REG) << 8 | IN_BYTE (IDE_BCOUNTL_REG); |
| ireason = IN_BYTE (IDE_IREASON_REG); |
| |
| if (ireason & IDESCSI_IREASON_COD) { |
| printk (KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n"); |
| return ide_do_reset (drive); |
| } |
| if (ireason & IDESCSI_IREASON_IO) { |
| temp = pc->actually_transferred + bcount; |
| if ( temp > pc->request_transfer) { |
| if (temp > pc->buffer_size) { |
| printk (KERN_ERR "ide-scsi: The scsi wants to send us more data than expected - discarding data\n"); |
| temp = pc->buffer_size - pc->actually_transferred; |
| if (temp) { |
| clear_bit(PC_WRITING, &pc->flags); |
| if (pc->sg) |
| idescsi_input_buffers(drive, pc, temp); |
| else |
| atapi_input_bytes(drive, pc->current_position, temp); |
| printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount); |
| } |
| pc->actually_transferred += temp; |
| pc->current_position += temp; |
| idescsi_discard_data (drive,bcount - temp); |
| ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL); |
| return ide_started; |
| } |
| #if IDESCSI_DEBUG_LOG |
| printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n"); |
| #endif /* IDESCSI_DEBUG_LOG */ |
| } |
| } |
| if (ireason & IDESCSI_IREASON_IO) { |
| clear_bit(PC_WRITING, &pc->flags); |
| if (pc->sg) |
| idescsi_input_buffers (drive, pc, bcount); |
| else |
| atapi_input_bytes (drive,pc->current_position,bcount); |
| } else { |
| set_bit(PC_WRITING, &pc->flags); |
| if (pc->sg) |
| idescsi_output_buffers (drive, pc, bcount); |
| else |
| atapi_output_bytes (drive,pc->current_position,bcount); |
| } |
| pc->actually_transferred+=bcount; /* Update the current position */ |
| pc->current_position+=bcount; |
| |
| ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL); /* And set the interrupt handler again */ |
| return ide_started; |
| } |
| |
| static ide_startstop_t idescsi_transfer_pc (ide_drive_t *drive) |
| { |
| idescsi_scsi_t *scsi = drive->driver_data; |
| idescsi_pc_t *pc = scsi->pc; |
| byte ireason; |
| ide_startstop_t startstop; |
| |
| if (ide_wait_stat (&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) { |
| printk (KERN_ERR "ide-scsi: Strange, packet command initiated yet DRQ isn't asserted\n"); |
| return startstop; |
| } |
| ireason = IN_BYTE (IDE_IREASON_REG); |
| if ((ireason & (IDESCSI_IREASON_IO | IDESCSI_IREASON_COD)) != IDESCSI_IREASON_COD) { |
| printk (KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while issuing a packet command\n"); |
| return ide_do_reset (drive); |
| } |
| ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL); /* Set the interrupt routine */ |
| atapi_output_bytes (drive, scsi->pc->c, 12); /* Send the actual packet */ |
| return ide_started; |
| } |
| |
| /* |
| * Issue a packet command |
| */ |
| static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc) |
| { |
| idescsi_scsi_t *scsi = drive->driver_data; |
| int bcount; |
| struct request *rq = pc->rq; |
| int dma_ok = 0; |
| |
| scsi->pc=pc; /* Set the current packet command */ |
| pc->actually_transferred=0; /* We haven't transferred any data yet */ |
| pc->current_position=pc->buffer; |
| bcount = IDE_MIN (pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */ |
| |
| if (drive->using_dma && rq->bio) |
| dma_ok=!HWIF(drive)->dmaproc(test_bit (PC_WRITING, &pc->flags) ? ide_dma_write : ide_dma_read, drive); |
| |
| SELECT_DRIVE(HWIF(drive), drive); |
| if (IDE_CONTROL_REG) |
| OUT_BYTE (drive->ctl,IDE_CONTROL_REG); |
| OUT_BYTE (dma_ok,IDE_FEATURE_REG); |
| OUT_BYTE (bcount >> 8,IDE_BCOUNTH_REG); |
| OUT_BYTE (bcount & 0xff,IDE_BCOUNTL_REG); |
| |
| if (dma_ok) { |
| set_bit (PC_DMA_IN_PROGRESS, &pc->flags); |
| (void) (HWIF(drive)->dmaproc(ide_dma_begin, drive)); |
| } |
| if (test_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags)) { |
| ide_set_handler (drive, &idescsi_transfer_pc, get_timeout(pc), NULL); |
| OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG); /* Issue the packet command */ |
| return ide_started; |
| } else { |
| OUT_BYTE (WIN_PACKETCMD, IDE_COMMAND_REG); |
| return idescsi_transfer_pc (drive); |
| } |
| } |
| |
| /* |
| * idescsi_do_request is our request handling function. |
| */ |
| static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, unsigned long block) |
| { |
| #if IDESCSI_DEBUG_LOG |
| printk (KERN_INFO "rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",rq->rq_status,(unsigned int) rq->rq_dev,rq->cmd,rq->errors); |
| printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %ld\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors); |
| #endif /* IDESCSI_DEBUG_LOG */ |
| |
| if (rq->flags & REQ_SPECIAL) { |
| return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special); |
| } |
| blk_dump_rq_flags(rq, "ide-scsi: unsup command"); |
| idescsi_end_request (0,HWGROUP (drive)); |
| return ide_stopped; |
| } |
| |
| static int idescsi_open (struct inode *inode, struct file *filp, ide_drive_t *drive) |
| { |
| MOD_INC_USE_COUNT; |
| return 0; |
| } |
| |
| static void idescsi_ide_release (struct inode *inode, struct file *filp, ide_drive_t *drive) |
| { |
| MOD_DEC_USE_COUNT; |
| } |
| |
| static ide_drive_t *idescsi_drives[MAX_HWIFS * MAX_DRIVES]; |
| static int idescsi_initialized = 0; |
| |
| static void idescsi_add_settings(ide_drive_t *drive) |
| { |
| idescsi_scsi_t *scsi = 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, "bios_cyl", SETTING_RW, -1, -1, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL); |
| ide_add_setting(drive, "bios_head", SETTING_RW, -1, -1, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL); |
| ide_add_setting(drive, "bios_sect", SETTING_RW, -1, -1, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL); |
| ide_add_setting(drive, "transform", SETTING_RW, -1, -1, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL); |
| ide_add_setting(drive, "log", SETTING_RW, -1, -1, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL); |
| } |
| |
| /* |
| * Driver initialization. |
| */ |
| static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi, int id) |
| { |
| DRIVER(drive)->busy++; |
| idescsi_drives[id] = drive; |
| drive->driver_data = scsi; |
| drive->ready_stat = 0; |
| memset (scsi, 0, sizeof (idescsi_scsi_t)); |
| scsi->drive = drive; |
| if (drive->id && (drive->id->config & 0x0060) == 0x20) |
| set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags); |
| set_bit(IDESCSI_TRANSFORM, &scsi->transform); |
| clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); |
| #if IDESCSI_DEBUG_LOG |
| set_bit(IDESCSI_LOG_CMD, &scsi->log); |
| #endif /* IDESCSI_DEBUG_LOG */ |
| idescsi_add_settings(drive); |
| } |
| |
| static int idescsi_cleanup (ide_drive_t *drive) |
| { |
| idescsi_scsi_t *scsi = drive->driver_data; |
| |
| if (ide_unregister_subdriver (drive)) |
| return 1; |
| drive->driver_data = NULL; |
| kfree (scsi); |
| return 0; |
| } |
| |
| int idescsi_reinit(ide_drive_t *drive); |
| |
| /* |
| * IDE subdriver functions, registered with ide.c |
| */ |
| static ide_driver_t idescsi_driver = { |
| name: "ide-scsi", |
| version: IDESCSI_VERSION, |
| media: ide_scsi, |
| busy: 0, |
| supports_dma: 1, |
| supports_dsc_overlap: 0, |
| cleanup: idescsi_cleanup, |
| standby: NULL, |
| flushcache: NULL, |
| do_request: idescsi_do_request, |
| end_request: idescsi_end_request, |
| ioctl: NULL, |
| open: idescsi_open, |
| release: idescsi_ide_release, |
| media_change: NULL, |
| revalidate: NULL, |
| pre_reset: NULL, |
| capacity: NULL, |
| special: NULL, |
| proc: NULL, |
| driver_reinit: idescsi_reinit, |
| }; |
| |
| int idescsi_init (void); |
| static ide_module_t idescsi_module = { |
| IDE_DRIVER_MODULE, |
| idescsi_init, |
| &idescsi_driver, |
| NULL |
| }; |
| |
| int idescsi_reinit (ide_drive_t *drive) |
| { |
| #if 0 |
| idescsi_scsi_t *scsi; |
| byte media[] = {TYPE_DISK, TYPE_TAPE, TYPE_PROCESSOR, TYPE_WORM, TYPE_ROM, TYPE_SCANNER, TYPE_MOD, 255}; |
| int i, failed, id; |
| |
| if (!idescsi_initialized) |
| return 0; |
| for (i = 0; i < MAX_HWIFS * MAX_DRIVES; i++) |
| idescsi_drives[i] = NULL; |
| |
| MOD_INC_USE_COUNT; |
| for (i = 0; media[i] != 255; i++) { |
| failed = 0; |
| while ((drive = ide_scan_devices (media[i], idescsi_driver.name, NULL, failed++)) != NULL) { |
| |
| if ((scsi = (idescsi_scsi_t *) kmalloc (sizeof (idescsi_scsi_t), GFP_KERNEL)) == NULL) { |
| printk (KERN_ERR "ide-scsi: %s: Can't allocate a scsi structure\n", drive->name); |
| continue; |
| } |
| if (ide_register_subdriver (drive, &idescsi_driver, IDE_SUBDRIVER_VERSION)) { |
| printk (KERN_ERR "ide-scsi: %s: Failed to register the driver with ide.c\n", drive->name); |
| kfree (scsi); |
| continue; |
| } |
| for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++); |
| idescsi_setup (drive, scsi, id); |
| failed--; |
| } |
| } |
| ide_register_module(&idescsi_module); |
| MOD_DEC_USE_COUNT; |
| #endif |
| return 0; |
| } |
| |
| /* |
| * idescsi_init will register the driver for each scsi. |
| */ |
| int idescsi_init (void) |
| { |
| ide_drive_t *drive; |
| idescsi_scsi_t *scsi; |
| byte media[] = {TYPE_DISK, TYPE_TAPE, TYPE_PROCESSOR, TYPE_WORM, TYPE_ROM, TYPE_SCANNER, TYPE_MOD, 255}; |
| int i, failed, id; |
| |
| if (idescsi_initialized) |
| return 0; |
| idescsi_initialized = 1; |
| for (i = 0; i < MAX_HWIFS * MAX_DRIVES; i++) |
| idescsi_drives[i] = NULL; |
| MOD_INC_USE_COUNT; |
| for (i = 0; media[i] != 255; i++) { |
| failed = 0; |
| while ((drive = ide_scan_devices (media[i], idescsi_driver.name, NULL, failed++)) != NULL) { |
| |
| if ((scsi = (idescsi_scsi_t *) kmalloc (sizeof (idescsi_scsi_t), GFP_KERNEL)) == NULL) { |
| printk (KERN_ERR "ide-scsi: %s: Can't allocate a scsi structure\n", drive->name); |
| continue; |
| } |
| if (ide_register_subdriver (drive, &idescsi_driver, IDE_SUBDRIVER_VERSION)) { |
| printk (KERN_ERR "ide-scsi: %s: Failed to register the driver with ide.c\n", drive->name); |
| kfree (scsi); |
| continue; |
| } |
| for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++); |
| idescsi_setup (drive, scsi, id); |
| failed--; |
| } |
| } |
| ide_register_module(&idescsi_module); |
| MOD_DEC_USE_COUNT; |
| return 0; |
| } |
| |
| int idescsi_detect (Scsi_Host_Template *host_template) |
| { |
| struct Scsi_Host *host; |
| int id; |
| int last_lun = 0; |
| |
| host_template->proc_name = "ide-scsi"; |
| host = scsi_register(host_template, 0); |
| if(host == NULL) |
| return 0; |
| |
| for (id = 0; id < MAX_HWIFS * MAX_DRIVES && idescsi_drives[id]; id++) |
| last_lun = IDE_MAX(last_lun, idescsi_drives[id]->last_lun); |
| host->max_id = id; |
| host->max_lun = last_lun + 1; |
| host->can_queue = host->cmd_per_lun * id; |
| return 1; |
| } |
| |
| int idescsi_release (struct Scsi_Host *host) |
| { |
| ide_drive_t *drive; |
| int id; |
| |
| for (id = 0; id < MAX_HWIFS * MAX_DRIVES; id++) { |
| drive = idescsi_drives[id]; |
| if (drive) |
| DRIVER(drive)->busy--; |
| } |
| return 0; |
| } |
| |
| const char *idescsi_info (struct Scsi_Host *host) |
| { |
| return "SCSI host adapter emulation for IDE ATAPI devices"; |
| } |
| |
| int idescsi_ioctl (Scsi_Device *dev, int cmd, void *arg) |
| { |
| ide_drive_t *drive = idescsi_drives[dev->id]; |
| idescsi_scsi_t *scsi = drive->driver_data; |
| |
| if (cmd == SG_SET_TRANSFORM) { |
| if (arg) |
| set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); |
| else |
| clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); |
| return 0; |
| } else if (cmd == SG_GET_TRANSFORM) |
| return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int *) arg); |
| return -EINVAL; |
| } |
| |
| static inline struct bio *idescsi_kmalloc_bio (int count) |
| { |
| struct bio *bh, *bhp, *first_bh; |
| |
| if ((first_bh = bhp = bh = bio_alloc(GFP_ATOMIC, 1)) == NULL) |
| goto abort; |
| bio_init(bh); |
| bh->bi_vcnt = 1; |
| while (--count) { |
| if ((bh = bio_alloc(GFP_ATOMIC, 1)) == NULL) |
| goto abort; |
| bio_init(bh); |
| bh->bi_vcnt = 1; |
| bhp->bi_next = bh; |
| bhp = bh; |
| bh->bi_next = NULL; |
| } |
| return first_bh; |
| abort: |
| idescsi_free_bio (first_bh); |
| return NULL; |
| } |
| |
| static inline int idescsi_set_direction (idescsi_pc_t *pc) |
| { |
| switch (pc->c[0]) { |
| case READ_6: case READ_10: case READ_12: |
| clear_bit (PC_WRITING, &pc->flags); |
| return 0; |
| case WRITE_6: case WRITE_10: case WRITE_12: |
| set_bit (PC_WRITING, &pc->flags); |
| return 0; |
| default: |
| return 1; |
| } |
| } |
| |
| static inline struct bio *idescsi_dma_bio(ide_drive_t *drive, idescsi_pc_t *pc) |
| { |
| struct bio *bh = NULL, *first_bh = NULL; |
| int segments = pc->scsi_cmd->use_sg; |
| struct scatterlist *sg = pc->scsi_cmd->request_buffer; |
| |
| if (!drive->using_dma || !pc->request_transfer || pc->request_transfer % 1024) |
| return NULL; |
| if (idescsi_set_direction(pc)) |
| return NULL; |
| if (segments) { |
| if ((first_bh = bh = idescsi_kmalloc_bio (segments)) == NULL) |
| return NULL; |
| #if IDESCSI_DEBUG_LOG |
| printk ("ide-scsi: %s: building DMA table, %d segments, %dkB total\n", drive->name, segments, pc->request_transfer >> 10); |
| #endif /* IDESCSI_DEBUG_LOG */ |
| while (segments--) { |
| bh->bi_io_vec[0].bv_page = sg->page; |
| bh->bi_io_vec[0].bv_len = sg->length; |
| bh->bi_io_vec[0].bv_offset = sg->offset; |
| bh->bi_size = sg->length; |
| bh = bh->bi_next; |
| sg++; |
| } |
| } else { |
| if ((first_bh = bh = idescsi_kmalloc_bio (1)) == NULL) |
| return NULL; |
| #if IDESCSI_DEBUG_LOG |
| printk ("ide-scsi: %s: building DMA table for a single buffer (%dkB)\n", drive->name, pc->request_transfer >> 10); |
| #endif /* IDESCSI_DEBUG_LOG */ |
| bh->bi_io_vec[0].bv_page = virt_to_page(pc->scsi_cmd->request_buffer); |
| bh->bi_io_vec[0].bv_len = pc->request_transfer; |
| bh->bi_io_vec[0].bv_offset = (unsigned long) pc->scsi_cmd->request_buffer & ~PAGE_MASK; |
| bh->bi_size = pc->request_transfer; |
| } |
| return first_bh; |
| } |
| |
| static inline int should_transform(ide_drive_t *drive, Scsi_Cmnd *cmd) |
| { |
| idescsi_scsi_t *scsi = drive->driver_data; |
| |
| if (major(cmd->request.rq_dev) == SCSI_GENERIC_MAJOR) |
| return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform); |
| return test_bit(IDESCSI_TRANSFORM, &scsi->transform); |
| } |
| |
| int idescsi_queue (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) |
| { |
| ide_drive_t *drive = idescsi_drives[cmd->target]; |
| idescsi_scsi_t *scsi; |
| struct request *rq = NULL; |
| idescsi_pc_t *pc = NULL; |
| |
| if (!drive) { |
| printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->target); |
| goto abort; |
| } |
| scsi = drive->driver_data; |
| pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC); |
| rq = kmalloc (sizeof (struct request), GFP_ATOMIC); |
| if (rq == NULL || pc == NULL) { |
| printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name); |
| goto abort; |
| } |
| |
| memset (pc->c, 0, 12); |
| pc->flags = 0; |
| pc->rq = rq; |
| memcpy (pc->c, cmd->cmnd, cmd->cmd_len); |
| if (cmd->use_sg) { |
| pc->buffer = NULL; |
| pc->sg = cmd->request_buffer; |
| } else { |
| pc->buffer = cmd->request_buffer; |
| pc->sg = NULL; |
| } |
| pc->b_count = 0; |
| pc->request_transfer = pc->buffer_size = cmd->request_bufflen; |
| pc->scsi_cmd = cmd; |
| pc->done = done; |
| pc->timeout = jiffies + cmd->timeout_per_command; |
| |
| if (should_transform(drive, cmd)) |
| set_bit(PC_TRANSFORM, &pc->flags); |
| idescsi_transform_pc1 (drive, pc); |
| |
| if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) { |
| printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number); |
| hexdump(cmd->cmnd, cmd->cmd_len); |
| if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) { |
| printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number); |
| hexdump(pc->c, 12); |
| } |
| } |
| |
| ide_init_drive_cmd (rq); |
| rq->special = (char *) pc; |
| rq->bio = idescsi_dma_bio (drive, pc); |
| rq->flags = REQ_SPECIAL; |
| spin_unlock_irq(cmd->host->host_lock); |
| (void) ide_do_drive_cmd (drive, rq, ide_end); |
| spin_lock_irq(cmd->host->host_lock); |
| return 0; |
| abort: |
| if (pc) kfree (pc); |
| if (rq) kfree (rq); |
| cmd->result = DID_ERROR << 16; |
| done(cmd); |
| return 0; |
| } |
| |
| int idescsi_abort (Scsi_Cmnd *cmd) |
| { |
| return SCSI_ABORT_SNOOZE; |
| } |
| |
| int idescsi_reset (Scsi_Cmnd *cmd, unsigned int resetflags) |
| { |
| return SCSI_RESET_SUCCESS; |
| } |
| |
| int idescsi_bios (Disk *disk, kdev_t dev, int *parm) |
| { |
| ide_drive_t *drive = idescsi_drives[disk->device->id]; |
| |
| if (drive->bios_cyl && drive->bios_head && drive->bios_sect) { |
| parm[0] = drive->bios_head; |
| parm[1] = drive->bios_sect; |
| parm[2] = drive->bios_cyl; |
| } |
| return 0; |
| } |
| |
| static Scsi_Host_Template idescsi_template = { |
| module: THIS_MODULE, |
| name: "idescsi", |
| detect: idescsi_detect, |
| release: idescsi_release, |
| info: idescsi_info, |
| ioctl: idescsi_ioctl, |
| queuecommand: idescsi_queue, |
| abort: idescsi_abort, |
| reset: idescsi_reset, |
| bios_param: idescsi_bios, |
| can_queue: 10, |
| this_id: -1, |
| sg_tablesize: 256, |
| cmd_per_lun: 5, |
| use_clustering: DISABLE_CLUSTERING, |
| emulated: 1, |
| }; |
| |
| static int __init init_idescsi_module(void) |
| { |
| idescsi_init(); |
| scsi_register_host(&idescsi_template); |
| return 0; |
| } |
| |
| static void __exit exit_idescsi_module(void) |
| { |
| ide_drive_t *drive; |
| byte media[] = {TYPE_DISK, TYPE_TAPE, TYPE_PROCESSOR, TYPE_WORM, TYPE_ROM, TYPE_SCANNER, TYPE_MOD, 255}; |
| int i, failed; |
| |
| scsi_unregister_host(&idescsi_template); |
| for (i = 0; media[i] != 255; i++) { |
| failed = 0; |
| while ((drive = ide_scan_devices (media[i], idescsi_driver.name, &idescsi_driver, failed)) != NULL) |
| if (idescsi_cleanup (drive)) { |
| printk ("%s: exit_idescsi_module() called while still busy\n", drive->name); |
| failed++; |
| } |
| } |
| ide_unregister_module(&idescsi_module); |
| } |
| |
| module_init(init_idescsi_module); |
| module_exit(exit_idescsi_module); |
| MODULE_LICENSE("GPL"); |