blob: 515c5525af2591e7380e5cbb39d06b46d26d7d37 [file] [log] [blame]
/*
* 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.
* Ver 0.91 Jun 10 02 Fix "off by one" error in transforms
* Ver 0.92 Dec 31 02 Implement new SCSI mid level API
*/
#define IDESCSI_VERSION "0.92"
#include <linux/module.h>
#include <linux/config.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 <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 */
u8 *buffer; /* Data buffer */
u8 *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;
static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
{
return (idescsi_scsi_t*) (&host[1]);
}
static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
{
return scsihost_to_idescsi(ide_drive->driver_data);
}
/*
* Per ATAPI device status bits.
*/
#define IDESCSI_DRQ_INTERRUPT 0 /* DRQ interrupt device */
/*
* ide-scsi requests.
*/
#define IDESCSI_PC_RQ 90
static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
{
while (bcount--)
(void) HWIF(drive)->INB(IDE_DATA_REG);
}
static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
{
while (bcount--)
HWIF(drive)->OUTB(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) {
unsigned short new_len;
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];
new_len = sc[4] + 4;
c[8] = new_len;
c[7] = new_len >> 8;
c[9] = sc[5];
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 int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
idescsi_pc_t *pc;
struct request *rq;
u8 *buf;
/* stuff a sense request in front of our current request */
pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
if (pc == NULL || rq == NULL || buf == NULL) {
if (pc) kfree(pc);
if (rq) kfree(rq);
if (buf) kfree(buf);
return -ENOMEM;
}
memset (pc, 0, sizeof (idescsi_pc_t));
memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
ide_init_drive_cmd(rq);
rq->special = (char *) pc;
pc->rq = rq;
pc->buffer = buf;
pc->c[0] = REQUEST_SENSE;
pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
rq->flags = REQ_SENSE;
pc->timeout = jiffies + WAIT_READY;
/* NOTE! Save the failed packet command in "rq->buffer" */
rq->buffer = (void *) failed_command->special;
pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
printk ("ide-scsi: %s: queue cmd = ", drive->name);
hexdump(pc->c, 6);
}
return ide_do_drive_cmd(drive, rq, ide_preempt);
}
static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
struct request *rq = HWGROUP(drive)->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|REQ_SENSE))) {
ide_end_request(drive, uptodate, nrsecs);
return 0;
}
ide_end_drive_cmd (drive, 0, 0);
if (rq->flags & REQ_SENSE) {
idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
if (log) {
printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
hexdump(pc->buffer,16);
}
memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
kfree(pc->buffer);
kfree(pc);
kfree(rq);
pc = opc;
rq = pc->rq;
pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
} else 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) {
if (log)
printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
if (!idescsi_check_condition(drive, rq))
/* we started a request sense, so we'll be back, exit for now */
return 0;
pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
} 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->device->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;
return 0;
}
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_to_idescsi(drive);
idescsi_pc_t *pc=scsi->pc;
struct request *rq = pc->rq;
atapi_bcount_t bcount;
atapi_status_t status;
atapi_ireason_t ireason;
atapi_feature_t feature;
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)->ide_dma_end(drive);
}
feature.all = 0;
/* Clear the interrupt */
status.all = HWIF(drive)->INB(IDE_STATUS_REG);
if (!status.b.drq) {
/* No more interrupts */
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
local_irq_enable();
if (status.b.check)
rq->errors++;
idescsi_end_request (drive, 1, 0);
return ide_stopped;
}
bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
if (ireason.b.cod) {
printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
return ide_do_reset (drive);
}
if (ireason.b.io) {
temp = pc->actually_transferred + bcount.all;
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.all);
}
pc->actually_transferred += temp;
pc->current_position += temp;
idescsi_discard_data(drive, bcount.all - 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.b.io) {
clear_bit(PC_WRITING, &pc->flags);
if (pc->sg)
idescsi_input_buffers(drive, pc, bcount.all);
else
HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
} else {
set_bit(PC_WRITING, &pc->flags);
if (pc->sg)
idescsi_output_buffers (drive, pc, bcount.all);
else
HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
}
/* Update the current position */
pc->actually_transferred += bcount.all;
pc->current_position += bcount.all;
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_to_idescsi(drive);
idescsi_pc_t *pc = scsi->pc;
atapi_ireason_t 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.all = HWIF(drive)->INB(IDE_IREASON_REG);
if (!ireason.b.cod || ireason.b.io) {
printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
"issuing a packet command\n");
return ide_do_reset (drive);
}
if (HWGROUP(drive)->handler != NULL)
BUG();
/* Set the interrupt routine */
ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), NULL);
/* Send the actual packet */
atapi_output_bytes(drive, scsi->pc->c, 12);
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_to_idescsi(drive);
atapi_feature_t feature;
atapi_bcount_t bcount;
struct request *rq = pc->rq;
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.all = IDE_MIN(pc->request_transfer, 63 * 1024); /* Request to transfer the entire buffer at once */
if (drive->using_dma && rq->bio) {
if (test_bit(PC_WRITING, &pc->flags))
feature.b.dma = !HWIF(drive)->ide_dma_write(drive);
else
feature.b.dma = !HWIF(drive)->ide_dma_read(drive);
}
SELECT_DRIVE(drive);
if (IDE_CONTROL_REG)
HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
if (feature.b.dma) {
set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
(void) (HWIF(drive)->ide_dma_begin(drive));
}
if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
if (HWGROUP(drive)->handler != NULL)
BUG();
ide_set_handler(drive, &idescsi_transfer_pc,
get_timeout(pc), NULL);
/* Issue the packet command */
HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
return ide_started;
} else {
/* Issue the packet command */
HWIF(drive)->OUTB(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, sector_t block)
{
#if IDESCSI_DEBUG_LOG
printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
#endif /* IDESCSI_DEBUG_LOG */
if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
}
blk_dump_rq_flags(rq, "ide-scsi: unsup command");
idescsi_end_request (drive, 0, 0);
return ide_stopped;
}
static void idescsi_add_settings(ide_drive_t *drive)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
/*
* 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)
{
DRIVER(drive)->busy++;
drive->ready_stat = 0;
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);
DRIVER(drive)->busy--;
}
static int idescsi_cleanup (ide_drive_t *drive)
{
struct Scsi_Host *scsihost = drive->driver_data;
if (ide_unregister_subdriver(drive))
return 1;
/* FIXME?: Are these two statements necessary? */
drive->driver_data = NULL;
drive->disk->fops = ide_fops;
scsi_remove_host(scsihost);
scsi_unregister(scsihost);
return 0;
}
static int idescsi_attach(ide_drive_t *drive);
/*
* IDE subdriver functions, registered with ide.c
*/
static ide_driver_t idescsi_driver = {
.owner = THIS_MODULE,
.name = "ide-scsi",
.version = IDESCSI_VERSION,
.media = ide_scsi,
.busy = 0,
.supports_dma = 1,
.supports_dsc_overlap = 0,
.attach = idescsi_attach,
.cleanup = idescsi_cleanup,
.do_request = idescsi_do_request,
.end_request = idescsi_end_request,
.drives = LIST_HEAD_INIT(idescsi_driver.drives),
};
static int idescsi_ide_open(struct inode *inode, struct file *filp)
{
ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
drive->usage++;
return 0;
}
static int idescsi_ide_release(struct inode *inode, struct file *filp)
{
ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
drive->usage--;
return 0;
}
static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct block_device *bdev = inode->i_bdev;
return generic_ide_ioctl(bdev, cmd, arg);
}
static struct block_device_operations idescsi_ops = {
.owner = THIS_MODULE,
.open = idescsi_ide_open,
.release = idescsi_ide_release,
.ioctl = idescsi_ide_ioctl,
};
static int idescsi_attach(ide_drive_t *drive);
static int idescsi_slave_configure(Scsi_Device * sdp)
{
/* Configure detected device */
scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
return 0;
}
static const char *idescsi_info (struct Scsi_Host *host)
{
return "SCSI host adapter emulation for IDE ATAPI devices";
}
static int idescsi_ioctl (Scsi_Device *dev, int cmd, void *arg)
{
idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
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_to_idescsi(drive);
struct gendisk *disk = cmd->request->rq_disk;
if (disk) {
struct Scsi_Device_Template **p = disk->private_data;
if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
}
return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
}
static int idescsi_queue (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
{
idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
ide_drive_t *drive = scsi->drive;
struct request *rq = NULL;
idescsi_pc_t *pc = NULL;
if (!drive) {
printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
goto abort;
}
scsi = drive_to_idescsi(drive);
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->device->host->host_lock);
(void) ide_do_drive_cmd (drive, rq, ide_end);
spin_lock_irq(cmd->device->host->host_lock);
return 0;
abort:
if (pc) kfree (pc);
if (rq) kfree (rq);
cmd->result = DID_ERROR << 16;
done(cmd);
return 1;
}
static int idescsi_abort (Scsi_Cmnd *cmd)
{
int countdown = 8;
unsigned long flags;
idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
ide_drive_t *drive = scsi->drive;
printk (KERN_ERR "ide-scsi: abort called for %lu\n", cmd->serial_number);
while (countdown--) {
/* is cmd active?
* need to lock so this stuff doesn't change under us */
spin_lock_irqsave(&ide_lock, flags);
if (scsi->pc && scsi->pc->scsi_cmd &&
scsi->pc->scsi_cmd->serial_number == cmd->serial_number) {
/* yep - let's give it some more time -
* we can do that, we're in _our_ error kernel thread */
spin_unlock_irqrestore(&ide_lock, flags);
scsi_sleep(HZ);
continue;
}
/* no, but is it queued in the ide subsystem? */
if (elv_queue_empty(&drive->queue)) {
spin_unlock_irqrestore(&ide_lock, flags);
return SUCCESS;
}
spin_unlock_irqrestore(&ide_lock, flags);
schedule_timeout(HZ/10);
}
return FAILED;
}
static int idescsi_reset (Scsi_Cmnd *cmd)
{
unsigned long flags;
struct request *req;
idescsi_scsi_t *idescsi = scsihost_to_idescsi(cmd->device->host);
ide_drive_t *drive = idescsi->drive;
printk (KERN_ERR "ide-scsi: reset called for %lu\n", cmd->serial_number);
/* first null the handler for the drive and let any process
* doing IO (on another CPU) run to (partial) completion
* the lock prevents processing new requests */
spin_lock_irqsave(&ide_lock, flags);
while (HWGROUP(drive)->handler) {
HWGROUP(drive)->handler = NULL;
schedule_timeout(1);
}
/* now nuke the drive queue */
while ((req = elv_next_request(&drive->queue))) {
blkdev_dequeue_request(req);
end_that_request_last(req);
}
/* FIXME - this will probably leak memory */
HWGROUP(drive)->rq = NULL;
if (drive_to_idescsi(drive))
drive_to_idescsi(drive)->pc = NULL;
spin_unlock_irqrestore(&ide_lock, flags);
/* finally, reset the drive (and its partner on the bus...) */
ide_do_reset (drive);
return SUCCESS;
}
static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
sector_t capacity, int *parm)
{
idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
ide_drive_t *drive = idescsi->drive;
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",
.info = idescsi_info,
.slave_configure = idescsi_slave_configure,
.ioctl = idescsi_ioctl,
.queuecommand = idescsi_queue,
.eh_abort_handler = idescsi_abort,
.eh_device_reset_handler = idescsi_reset,
.bios_param = idescsi_bios,
.can_queue = 40,
.this_id = -1,
.sg_tablesize = 256,
.cmd_per_lun = 5,
.max_sectors = 128,
.use_clustering = DISABLE_CLUSTERING,
.emulated = 1,
.proc_name = "ide-scsi",
};
static struct device idescsi_primary = {
.name = "Ide-scsi Parent",
.bus_id = "ide-scsi",
};
static struct bus_type idescsi_emu_bus = {
.name = "ide-scsi",
};
static int idescsi_attach(ide_drive_t *drive)
{
idescsi_scsi_t *idescsi;
struct Scsi_Host *host;
int err;
if (!strstr("ide-scsi", drive->driver_req) ||
!drive->present ||
drive->media == ide_disk ||
!(host = scsi_register(&idescsi_template,sizeof(idescsi_scsi_t))))
return 1;
host->max_id = 1;
host->max_lun = 1;
drive->driver_data = host;
idescsi = scsihost_to_idescsi(host);
idescsi->drive = drive;
err = ide_register_subdriver (drive, &idescsi_driver,
IDE_SUBDRIVER_VERSION);
if (!err) {
idescsi_setup (drive, idescsi);
drive->disk->fops = &idescsi_ops;
err = scsi_add_host(host, &idescsi_primary);
if (!err)
return 0;
/* fall through on error */
ide_unregister_subdriver(drive);
}
scsi_unregister(host);
return err;
}
static int __init init_idescsi_module(void)
{
int err;
err = bus_register(&idescsi_emu_bus);
if (!err) {
err = device_register(&idescsi_primary);
if (!err) {
err = ide_register_driver(&idescsi_driver);
if (!err)
return 0;
device_unregister(&idescsi_primary);
}
bus_unregister(&idescsi_emu_bus);
}
return err;
}
static void __exit exit_idescsi_module(void)
{
device_unregister(&idescsi_primary);
bus_unregister (&idescsi_emu_bus);
ide_unregister_driver(&idescsi_driver);
}
module_init(init_idescsi_module);
module_exit(exit_idescsi_module);
MODULE_LICENSE("GPL");