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OpenCloudOS-Kernel/drivers/scsi/ide-scsi.c

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/*
* Copyright (C) 1996-1999 Gadi Oxman <gadio@netvision.net.il>
* Copyright (C) 2004-2005 Bartlomiej Zolnierkiewicz
*/
/*
* 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/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 <linux/scatterlist.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/sg.h>
#define IDESCSI_DEBUG_LOG 0
#if IDESCSI_DEBUG_LOG
#define debug_log(fmt, args...) \
printk(KERN_INFO "ide-scsi: " fmt, ## args)
#else
#define debug_log(fmt, args...) do {} while (0)
#endif
/*
* SCSI command transformation layer
*/
#define IDESCSI_SG_TRANSFORM 1 /* /dev/sg transformation */
/*
* Log flags
*/
#define IDESCSI_LOG_CMD 0 /* Log SCSI commands */
typedef struct ide_scsi_obj {
ide_drive_t *drive;
ide_driver_t *driver;
struct gendisk *disk;
struct Scsi_Host *host;
struct ide_atapi_pc *pc; /* Current packet command */
unsigned long transform; /* SCSI cmd translation layer */
unsigned long log; /* log flags */
} idescsi_scsi_t;
static DEFINE_MUTEX(idescsi_ref_mutex);
/* Set by module param to skip cd */
static int idescsi_nocd;
#define ide_scsi_g(disk) \
container_of((disk)->private_data, struct ide_scsi_obj, driver)
static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
{
struct ide_scsi_obj *scsi = NULL;
mutex_lock(&idescsi_ref_mutex);
scsi = ide_scsi_g(disk);
if (scsi) {
if (ide_device_get(scsi->drive))
scsi = NULL;
else
scsi_host_get(scsi->host);
}
mutex_unlock(&idescsi_ref_mutex);
return scsi;
}
static void ide_scsi_put(struct ide_scsi_obj *scsi)
{
ide_drive_t *drive = scsi->drive;
mutex_lock(&idescsi_ref_mutex);
scsi_host_put(scsi->host);
ide_device_put(drive);
mutex_unlock(&idescsi_ref_mutex);
}
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);
}
/*
* PIO data transfer routine using the scatter gather table.
*/
static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
unsigned int bcount, int write)
{
ide_hwif_t *hwif = drive->hwif;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
char *buf;
int count;
while (bcount) {
count = min(pc->sg->length - pc->b_count, bcount);
if (PageHighMem(sg_page(pc->sg))) {
unsigned long flags;
local_irq_save(flags);
buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
pc->sg->offset;
xf(drive, NULL, buf + pc->b_count, count);
kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
local_irq_restore(flags);
} else {
buf = sg_virt(pc->sg);
xf(drive, NULL, buf + pc->b_count, count);
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
if (!--pc->sg_cnt)
break;
pc->sg = sg_next(pc->sg);
pc->b_count = 0;
}
}
if (bcount) {
printk(KERN_ERR "%s: scatter gather table too small, %s\n",
drive->name, write ? "padding with zeros"
: "discarding data");
ide_pad_transfer(drive, write, bcount);
}
}
static void ide_scsi_hex_dump(u8 *data, int len)
{
print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
}
static int idescsi_end_request(ide_drive_t *, int, int);
static void ide_scsi_callback(ide_drive_t *drive)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
struct ide_atapi_pc *pc = scsi->pc;
if (pc->flags & PC_FLAG_TIMEDOUT)
debug_log("%s: got timed out packet %lu at %lu\n", __func__,
pc->scsi_cmd->serial_number, jiffies);
/* end this request now - scsi should retry it*/
else if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
printk(KERN_INFO "Packet command completed, %d bytes"
" transferred\n", pc->xferred);
idescsi_end_request(drive, 1, 0);
}
static int idescsi_check_condition(ide_drive_t *drive,
struct request *failed_cmd)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
struct ide_atapi_pc *pc;
struct request *rq;
u8 *buf;
/* stuff a sense request in front of our current request */
pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
rq = blk_get_request(drive->queue, READ, GFP_ATOMIC);
buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
if (!pc || !rq || !buf) {
kfree(buf);
if (rq)
blk_put_request(rq);
kfree(pc);
return -ENOMEM;
}
rq->special = (char *) pc;
pc->rq = rq;
pc->buf = buf;
pc->c[0] = REQUEST_SENSE;
pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
rq->cmd_type = REQ_TYPE_SENSE;
rq->cmd_flags |= REQ_PREEMPT;
pc->timeout = jiffies + WAIT_READY;
/* NOTE! Save the failed packet command in "rq->buffer" */
rq->buffer = (void *) failed_cmd->special;
pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
printk ("ide-scsi: %s: queue cmd = ", drive->name);
ide_scsi_hex_dump(pc->c, 6);
}
rq->rq_disk = scsi->disk;
rq->ref_count++;
memcpy(rq->cmd, pc->c, 12);
ide_do_drive_cmd(drive, rq);
return 0;
}
static ide_startstop_t
idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
{
ide_hwif_t *hwif = drive->hwif;
if (hwif->tp_ops->read_status(hwif) & (BUSY_STAT | DRQ_STAT))
/* force an abort */
hwif->tp_ops->exec_command(hwif, WIN_IDLEIMMEDIATE);
rq->errors++;
idescsi_end_request(drive, 0, 0);
return ide_stopped;
}
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;
struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
struct Scsi_Host *host;
int errors = rq->errors;
unsigned long flags;
if (!blk_special_request(rq) && !blk_sense_request(rq)) {
ide_end_request(drive, uptodate, nrsecs);
return 0;
}
ide_end_drive_cmd (drive, 0, 0);
if (blk_sense_request(rq)) {
struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
if (log) {
printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
ide_scsi_hex_dump(pc->buf, 16);
}
memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
SCSI_SENSE_BUFFERSIZE);
kfree(pc->buf);
kfree(pc);
blk_put_request(rq);
pc = opc;
rq = pc->rq;
pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
(((pc->flags & PC_FLAG_TIMEDOUT) ?
DID_TIME_OUT :
DID_OK) << 16);
} else if (pc->flags & PC_FLAG_TIMEDOUT) {
if (log)
printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
drive->name, pc->scsi_cmd->serial_number);
pc->scsi_cmd->result = DID_TIME_OUT << 16;
} else if (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 (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;
}
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);
kfree(pc);
blk_put_request(rq);
scsi->pc = NULL;
return 0;
}
static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
{
return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
}
static int idescsi_expiry(ide_drive_t *drive)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
struct ide_atapi_pc *pc = scsi->pc;
debug_log("%s called for %lu at %lu\n", __func__,
pc->scsi_cmd->serial_number, jiffies);
pc->flags |= PC_FLAG_TIMEDOUT;
return 0; /* we do not want the ide subsystem to retry */
}
/*
* Our interrupt handler.
*/
static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
struct ide_atapi_pc *pc = scsi->pc;
return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
idescsi_expiry, NULL, NULL, NULL,
ide_scsi_io_buffers);
}
static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
get_timeout(scsi->pc), idescsi_expiry);
}
static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
{
switch (pc->c[0]) {
case READ_6: case READ_10: case READ_12:
pc->flags &= ~PC_FLAG_WRITING;
return 0;
case WRITE_6: case WRITE_10: case WRITE_12:
pc->flags |= PC_FLAG_WRITING;
return 0;
default:
return 1;
}
}
static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg, *scsi_sg;
int segments;
if (!pc->req_xfer || pc->req_xfer % 1024)
return 1;
if (idescsi_set_direction(pc))
return 1;
sg = hwif->sg_table;
scsi_sg = scsi_sglist(pc->scsi_cmd);
segments = scsi_sg_count(pc->scsi_cmd);
if (segments > hwif->sg_max_nents)
return 1;
hwif->sg_nents = segments;
memcpy(sg, scsi_sg, sizeof(*sg) * segments);
return 0;
}
static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
struct ide_atapi_pc *pc)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
/* Set the current packet command */
scsi->pc = pc;
return ide_issue_pc(drive, pc, idescsi_transfer_pc,
get_timeout(pc), idescsi_expiry);
}
/*
* 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)
{
debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
rq->cmd[0], rq->errors);
debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
rq->sector, rq->nr_sectors, rq->current_nr_sectors);
if (blk_sense_request(rq) || blk_special_request(rq)) {
struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
if (drive->using_dma && !idescsi_map_sg(drive, pc))
pc->flags |= PC_FLAG_DMA_OK;
return idescsi_issue_pc(drive, pc);
}
blk_dump_rq_flags(rq, "ide-scsi: unsup command");
idescsi_end_request (drive, 0, 0);
return ide_stopped;
}
#ifdef CONFIG_IDE_PROC_FS
static void idescsi_add_settings(ide_drive_t *drive)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
/*
* drive setting name read/write data type min max mul_factor div_factor data pointer set function
*/
ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1, &drive->bios_cyl, NULL);
ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1, &drive->bios_head, NULL);
ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0, 63, 1, 1, &drive->bios_sect, NULL);
ide_add_setting(drive, "transform", SETTING_RW, TYPE_INT, 0, 3, 1, 1, &scsi->transform, NULL);
ide_add_setting(drive, "log", SETTING_RW, TYPE_INT, 0, 1, 1, 1, &scsi->log, NULL);
}
#else
static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
#endif
/*
* Driver initialization.
*/
static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
{
if (drive->id && (drive->id->config & 0x0060) == 0x20)
set_bit(IDE_AFLAG_DRQ_INTERRUPT, &drive->atapi_flags);
clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
#if IDESCSI_DEBUG_LOG
set_bit(IDESCSI_LOG_CMD, &scsi->log);
#endif /* IDESCSI_DEBUG_LOG */
drive->pc_callback = ide_scsi_callback;
idescsi_add_settings(drive);
}
static void ide_scsi_remove(ide_drive_t *drive)
{
struct Scsi_Host *scsihost = drive->driver_data;
struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
struct gendisk *g = scsi->disk;
scsi_remove_host(scsihost);
ide_proc_unregister_driver(drive, scsi->driver);
ide_unregister_region(g);
drive->driver_data = NULL;
g->private_data = NULL;
put_disk(g);
ide_scsi_put(scsi);
drive->scsi = 0;
}
static int ide_scsi_probe(ide_drive_t *);
#ifdef CONFIG_IDE_PROC_FS
static ide_proc_entry_t idescsi_proc[] = {
{ "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
{ NULL, 0, NULL, NULL }
};
#endif
static ide_driver_t idescsi_driver = {
.gen_driver = {
.owner = THIS_MODULE,
.name = "ide-scsi",
.bus = &ide_bus_type,
},
.probe = ide_scsi_probe,
.remove = ide_scsi_remove,
.version = IDESCSI_VERSION,
.media = ide_scsi,
.supports_dsc_overlap = 0,
.do_request = idescsi_do_request,
.end_request = idescsi_end_request,
.error = idescsi_atapi_error,
#ifdef CONFIG_IDE_PROC_FS
.proc = idescsi_proc,
#endif
};
static int idescsi_ide_open(struct inode *inode, struct file *filp)
{
struct gendisk *disk = inode->i_bdev->bd_disk;
struct ide_scsi_obj *scsi;
if (!(scsi = ide_scsi_get(disk)))
return -ENXIO;
return 0;
}
static int idescsi_ide_release(struct inode *inode, struct file *filp)
{
struct gendisk *disk = inode->i_bdev->bd_disk;
struct ide_scsi_obj *scsi = ide_scsi_g(disk);
ide_scsi_put(scsi);
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;
struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
return generic_ide_ioctl(scsi->drive, file, 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_slave_configure(struct scsi_device * sdp)
{
/* Configure detected device */
sdp->use_10_for_rw = 1;
sdp->use_10_for_ms = 1;
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 (struct scsi_device *dev, int cmd, void __user *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 __user *) arg);
return -EINVAL;
}
static int idescsi_queue (struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct Scsi_Host *host = cmd->device->host;
idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
ide_drive_t *drive = scsi->drive;
struct request *rq = NULL;
struct ide_atapi_pc *pc = NULL;
int write = cmd->sc_data_direction == DMA_TO_DEVICE;
if (!drive) {
scmd_printk (KERN_ERR, cmd, "drive not present\n");
goto abort;
}
scsi = drive_to_idescsi(drive);
pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
rq = blk_get_request(drive->queue, write, 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;
if (cmd->sc_data_direction == DMA_TO_DEVICE)
pc->flags |= PC_FLAG_WRITING;
pc->rq = rq;
memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
pc->buf = NULL;
pc->sg = scsi_sglist(cmd);
pc->sg_cnt = scsi_sg_count(cmd);
pc->b_count = 0;
pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
pc->scsi_cmd = cmd;
pc->done = done;
pc->timeout = jiffies + cmd->timeout_per_command;
if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
ide_scsi_hex_dump(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);
ide_scsi_hex_dump(pc->c, 12);
}
}
rq->special = (char *) pc;
rq->cmd_type = REQ_TYPE_SPECIAL;
spin_unlock_irq(host->host_lock);
rq->ref_count++;
memcpy(rq->cmd, pc->c, 12);
blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
spin_lock_irq(host->host_lock);
return 0;
abort:
kfree (pc);
if (rq)
blk_put_request(rq);
cmd->result = DID_ERROR << 16;
done(cmd);
return 0;
}
static int idescsi_eh_abort (struct scsi_cmnd *cmd)
{
idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
ide_drive_t *drive = scsi->drive;
int busy;
int ret = FAILED;
/* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
if (!drive) {
printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
WARN_ON(1);
goto no_drive;
}
/* First give it some more time, how much is "right" is hard to say :-( */
busy = ide_wait_not_busy(HWIF(drive), 100); /* FIXME - uses mdelay which causes latency? */
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
spin_lock_irq(&ide_lock);
/* If there is no pc running we're done (our interrupt took care of it) */
if (!scsi->pc) {
ret = SUCCESS;
goto ide_unlock;
}
/* It's somewhere in flight. Does ide subsystem agree? */
if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
/*
* FIXME - not sure this condition can ever occur
*/
printk (KERN_ERR "ide-scsi: cmd aborted!\n");
if (blk_sense_request(scsi->pc->rq))
kfree(scsi->pc->buf);
/* we need to call blk_put_request twice. */
blk_put_request(scsi->pc->rq);
blk_put_request(scsi->pc->rq);
kfree(scsi->pc);
scsi->pc = NULL;
ret = SUCCESS;
}
ide_unlock:
spin_unlock_irq(&ide_lock);
no_drive:
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
return ret;
}
static int idescsi_eh_reset (struct scsi_cmnd *cmd)
{
struct request *req;
idescsi_scsi_t *scsi = scsihost_to_idescsi(cmd->device->host);
ide_drive_t *drive = scsi->drive;
int ready = 0;
int ret = SUCCESS;
/* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
if (!drive) {
printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
WARN_ON(1);
return FAILED;
}
spin_lock_irq(cmd->device->host->host_lock);
spin_lock(&ide_lock);
if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
spin_unlock(&ide_lock);
spin_unlock_irq(cmd->device->host->host_lock);
return FAILED;
}
/* kill current request */
if (__blk_end_request(req, -EIO, 0))
BUG();
if (blk_sense_request(req))
kfree(scsi->pc->buf);
kfree(scsi->pc);
scsi->pc = NULL;
blk_put_request(req);
/* now nuke the drive queue */
while ((req = elv_next_request(drive->queue))) {
if (__blk_end_request(req, -EIO, 0))
BUG();
}
HWGROUP(drive)->rq = NULL;
HWGROUP(drive)->handler = NULL;
HWGROUP(drive)->busy = 1; /* will set this to zero when ide reset finished */
spin_unlock(&ide_lock);
ide_do_reset(drive);
/* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
do {
spin_unlock_irq(cmd->device->host->host_lock);
msleep(50);
spin_lock_irq(cmd->device->host->host_lock);
} while ( HWGROUP(drive)->handler );
ready = drive_is_ready(drive);
HWGROUP(drive)->busy--;
if (!ready) {
printk (KERN_ERR "ide-scsi: reset failed!\n");
ret = FAILED;
}
spin_unlock_irq(cmd->device->host->host_lock);
return ret;
}
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 struct 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_eh_abort,
.eh_host_reset_handler = idescsi_eh_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 int ide_scsi_probe(ide_drive_t *drive)
{
idescsi_scsi_t *idescsi;
struct Scsi_Host *host;
struct gendisk *g;
static int warned;
int err = -ENOMEM;
if (!warned && drive->media == ide_cdrom) {
printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
warned = 1;
}
if (idescsi_nocd && drive->media == ide_cdrom)
return -ENODEV;
if (!strstr("ide-scsi", drive->driver_req) ||
!drive->present ||
drive->media == ide_disk ||
!(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
return -ENODEV;
drive->scsi = 1;
g = alloc_disk(1 << PARTN_BITS);
if (!g)
goto out_host_put;
ide_init_disk(g, drive);
host->max_id = 1;
if (drive->id->last_lun)
debug_log("%s: id->last_lun=%u\n", drive->name,
drive->id->last_lun);
if ((drive->id->last_lun & 0x7) != 7)
host->max_lun = (drive->id->last_lun & 0x7) + 1;
else
host->max_lun = 1;
drive->driver_data = host;
idescsi = scsihost_to_idescsi(host);
idescsi->drive = drive;
idescsi->driver = &idescsi_driver;
idescsi->host = host;
idescsi->disk = g;
g->private_data = &idescsi->driver;
ide_proc_register_driver(drive, &idescsi_driver);
err = 0;
idescsi_setup(drive, idescsi);
g->fops = &idescsi_ops;
ide_register_region(g);
err = scsi_add_host(host, &drive->gendev);
if (!err) {
scsi_scan_host(host);
return 0;
}
/* fall through on error */
ide_unregister_region(g);
ide_proc_unregister_driver(drive, &idescsi_driver);
put_disk(g);
out_host_put:
drive->scsi = 0;
scsi_host_put(host);
return err;
}
static int __init init_idescsi_module(void)
{
return driver_register(&idescsi_driver.gen_driver);
}
static void __exit exit_idescsi_module(void)
{
driver_unregister(&idescsi_driver.gen_driver);
}
module_param(idescsi_nocd, int, 0600);
MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
module_init(init_idescsi_module);
module_exit(exit_idescsi_module);
MODULE_LICENSE("GPL");
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