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ide-cd.c
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/*
* ATAPI CD-ROM driver.
*
* Copyright (C) 1994-1996 Scott Snyder <snyder@fnald0.fnal.gov>
* Copyright (C) 1996-1998 Erik Andersen <andersee@debian.org>
* Copyright (C) 1998-2000 Jens Axboe <axboe@suse.de>
* Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* See Documentation/cdrom/ide-cd for usage information.
*
* Suggestions are welcome. Patches that work are more welcome though. ;-)
* For those wishing to work on this driver, please be sure you download
* and comply with the latest Mt. Fuji (SFF8090 version 4) and ATAPI
* (SFF-8020i rev 2.6) standards. These documents can be obtained by
* anonymous ftp from:
* ftp://fission.dt.wdc.com/pub/standards/SFF_atapi/spec/SFF8020-r2.6/PS/8020r26.ps
* ftp://ftp.avc-pioneer.com/Mtfuji4/Spec/Fuji4r10.pdf
*
* For historical changelog please see:
* Documentation/ide/ChangeLog.ide-cd.1994-2004
*/
#define DRV_NAME "ide-cd"
#define PFX DRV_NAME ": "
#define IDECD_VERSION "5.00"
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/cdrom.h>
#include <linux/ide.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/bcd.h>
/* For SCSI -> ATAPI command conversion */
#include <scsi/scsi.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/byteorder.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>
#include "ide-cd.h"
#define IDECD_DEBUG_LOG 1
#if IDECD_DEBUG_LOG
#define ide_debug_log(lvl, fmt, args...) __ide_debug_log(lvl, fmt, args)
#else
#define ide_debug_log(lvl, fmt, args...) do {} while (0)
#endif
static DEFINE_MUTEX(idecd_ref_mutex);
static void ide_cd_release(struct kref *);
static struct cdrom_info *ide_cd_get(struct gendisk *disk)
{
struct cdrom_info *cd = NULL;
mutex_lock(&idecd_ref_mutex);
cd = ide_drv_g(disk, cdrom_info);
if (cd) {
if (ide_device_get(cd->drive))
cd = NULL;
else
kref_get(&cd->kref);
}
mutex_unlock(&idecd_ref_mutex);
return cd;
}
static void ide_cd_put(struct cdrom_info *cd)
{
ide_drive_t *drive = cd->drive;
mutex_lock(&idecd_ref_mutex);
kref_put(&cd->kref, ide_cd_release);
ide_device_put(drive);
mutex_unlock(&idecd_ref_mutex);
}
/*
* Generic packet command support and error handling routines.
*/
/* Mark that we've seen a media change and invalidate our internal buffers. */
static void cdrom_saw_media_change(ide_drive_t *drive)
{
drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;
}
static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
struct request_sense *sense)
{
int log = 0;
ide_debug_log(IDE_DBG_SENSE, "Call %s, sense_key: 0x%x\n", __func__,
sense->sense_key);
if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))
return 0;
switch (sense->sense_key) {
case NO_SENSE:
case RECOVERED_ERROR:
break;
case NOT_READY:
/*
* don't care about tray state messages for e.g. capacity
* commands or in-progress or becoming ready
*/
if (sense->asc == 0x3a || sense->asc == 0x04)
break;
log = 1;
break;
case ILLEGAL_REQUEST:
/*
* don't log START_STOP unit with LoEj set, since we cannot
* reliably check if drive can auto-close
*/
if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)
break;
log = 1;
break;
case UNIT_ATTENTION:
/*
* Make good and sure we've seen this potential media change.
* Some drives (i.e. Creative) fail to present the correct sense
* key in the error register.
*/
cdrom_saw_media_change(drive);
break;
default:
log = 1;
break;
}
return log;
}
static void cdrom_analyze_sense_data(ide_drive_t *drive,
struct request *failed_command,
struct request_sense *sense)
{
unsigned long sector;
unsigned long bio_sectors;
struct cdrom_info *info = drive->driver_data;
ide_debug_log(IDE_DBG_SENSE, "Call %s, error_code: 0x%x, "
"sense_key: 0x%x\n", __func__, sense->error_code,
sense->sense_key);
if (failed_command)
ide_debug_log(IDE_DBG_SENSE, "%s: failed cmd: 0x%x\n",
__func__, failed_command->cmd[0]);
if (!cdrom_log_sense(drive, failed_command, sense))
return;
/*
* If a read toc is executed for a CD-R or CD-RW medium where the first
* toc has not been recorded yet, it will fail with 05/24/00 (which is a
* confusing error)
*/
if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
if (sense->sense_key == 0x05 && sense->asc == 0x24)
return;
/* current error */
if (sense->error_code == 0x70) {
switch (sense->sense_key) {
case MEDIUM_ERROR:
case VOLUME_OVERFLOW:
case ILLEGAL_REQUEST:
if (!sense->valid)
break;
if (failed_command == NULL ||
!blk_fs_request(failed_command))
break;
sector = (sense->information[0] << 24) |
(sense->information[1] << 16) |
(sense->information[2] << 8) |
(sense->information[3]);
if (drive->queue->hardsect_size == 2048)
/* device sector size is 2K */
sector <<= 2;
bio_sectors = max(bio_sectors(failed_command->bio), 4U);
sector &= ~(bio_sectors - 1);
if (sector < get_capacity(info->disk) &&
drive->probed_capacity - sector < 4 * 75)
set_capacity(info->disk, sector);
}
}
ide_cd_log_error(drive->name, failed_command, sense);
}
static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
struct request *failed_command)
{
struct cdrom_info *info = drive->driver_data;
struct request *rq = &info->request_sense_request;
ide_debug_log(IDE_DBG_SENSE, "Call %s\n", __func__);
if (sense == NULL)
sense = &info->sense_data;
/* stuff the sense request in front of our current request */
blk_rq_init(NULL, rq);
rq->cmd_type = REQ_TYPE_ATA_PC;
rq->rq_disk = info->disk;
rq->data = sense;
rq->cmd[0] = GPCMD_REQUEST_SENSE;
rq->cmd[4] = 18;
rq->data_len = 18;
rq->cmd_type = REQ_TYPE_SENSE;
rq->cmd_flags |= REQ_PREEMPT;
/* NOTE! Save the failed command in "rq->buffer" */
rq->buffer = (void *) failed_command;
if (failed_command)
ide_debug_log(IDE_DBG_SENSE, "failed_cmd: 0x%x\n",
failed_command->cmd[0]);
ide_do_drive_cmd(drive, rq);
}
static void cdrom_end_request(ide_drive_t *drive, int uptodate)
{
struct request *rq = HWGROUP(drive)->rq;
int nsectors = rq->hard_cur_sectors;
ide_debug_log(IDE_DBG_FUNC, "Call %s, cmd: 0x%x, uptodate: 0x%x, "
"nsectors: %d\n", __func__, rq->cmd[0], uptodate,
nsectors);
if (blk_sense_request(rq) && uptodate) {
/*
* For REQ_TYPE_SENSE, "rq->buffer" points to the original
* failed request
*/
struct request *failed = (struct request *) rq->buffer;
struct cdrom_info *info = drive->driver_data;
void *sense = &info->sense_data;
if (failed) {
if (failed->sense) {
sense = failed->sense;
failed->sense_len = rq->sense_len;
}
cdrom_analyze_sense_data(drive, failed, sense);
/*
* now end the failed request
*/
if (blk_fs_request(failed)) {
if (ide_end_dequeued_request(drive, failed, 0,
failed->hard_nr_sectors))
BUG();
} else {
if (blk_end_request(failed, -EIO,
failed->data_len))
BUG();
}
} else
cdrom_analyze_sense_data(drive, NULL, sense);
}
if (!rq->current_nr_sectors && blk_fs_request(rq))
uptodate = 1;
/* make sure it's fully ended */
if (blk_pc_request(rq))
nsectors = (rq->data_len + 511) >> 9;
if (!nsectors)
nsectors = 1;
ide_debug_log(IDE_DBG_FUNC, "Exit %s, uptodate: 0x%x, nsectors: %d\n",
__func__, uptodate, nsectors);
ide_end_request(drive, uptodate, nsectors);
}
static void ide_dump_status_no_sense(ide_drive_t *drive, const char *msg, u8 st)
{
if (st & 0x80)
return;
ide_dump_status(drive, msg, st);
}
/*
* Returns:
* 0: if the request should be continued.
* 1: if the request was ended.
*/
static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
{
ide_hwif_t *hwif = drive->hwif;
ide_hwgroup_t *hwgroup = hwif->hwgroup;
struct request *rq = hwgroup->rq;
int stat, err, sense_key;
/* check for errors */
stat = hwif->tp_ops->read_status(hwif);
if (stat_ret)
*stat_ret = stat;
if (OK_STAT(stat, good_stat, BAD_R_STAT))
return 0;
/* get the IDE error register */
err = ide_read_error(drive);
sense_key = err >> 4;
if (rq == NULL) {
printk(KERN_ERR PFX "%s: missing rq in %s\n",
drive->name, __func__);
return 1;
}
ide_debug_log(IDE_DBG_RQ, "%s: stat: 0x%x, good_stat: 0x%x, "
"rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x, err: 0x%x\n",
__func__, stat, good_stat, rq->cmd[0], rq->cmd_type, err);
if (blk_sense_request(rq)) {
/*
* We got an error trying to get sense info from the drive
* (probably while trying to recover from a former error).
* Just give up.
*/
rq->cmd_flags |= REQ_FAILED;
cdrom_end_request(drive, 0);
ide_error(drive, "request sense failure", stat);
return 1;
} else if (blk_pc_request(rq) || rq->cmd_type == REQ_TYPE_ATA_PC) {
/* All other functions, except for READ. */
/*
* if we have an error, pass back CHECK_CONDITION as the
* scsi status byte
*/
if (blk_pc_request(rq) && !rq->errors)
rq->errors = SAM_STAT_CHECK_CONDITION;
/* check for tray open */
if (sense_key == NOT_READY) {
cdrom_saw_media_change(drive);
} else if (sense_key == UNIT_ATTENTION) {
/* check for media change */
cdrom_saw_media_change(drive);
return 0;
} else if (sense_key == ILLEGAL_REQUEST &&
rq->cmd[0] == GPCMD_START_STOP_UNIT) {
/*
* Don't print error message for this condition--
* SFF8090i indicates that 5/24/00 is the correct
* response to a request to close the tray if the
* drive doesn't have that capability.
* cdrom_log_sense() knows this!
*/
} else if (!(rq->cmd_flags & REQ_QUIET)) {
/* otherwise, print an error */
ide_dump_status(drive, "packet command error", stat);
}
rq->cmd_flags |= REQ_FAILED;
/*
* instead of playing games with moving completions around,
* remove failed request completely and end it when the
* request sense has completed
*/
goto end_request;
} else if (blk_fs_request(rq)) {
int do_end_request = 0;
/* handle errors from READ and WRITE requests */
if (blk_noretry_request(rq))
do_end_request = 1;
if (sense_key == NOT_READY) {
/* tray open */
if (rq_data_dir(rq) == READ) {
cdrom_saw_media_change(drive);
/* fail the request */
printk(KERN_ERR PFX "%s: tray open\n",
drive->name);
do_end_request = 1;
} else {
struct cdrom_info *info = drive->driver_data;
/*
* Allow the drive 5 seconds to recover, some
* devices will return this error while flushing
* data from cache.
*/
if (!rq->errors)
info->write_timeout = jiffies +
ATAPI_WAIT_WRITE_BUSY;
rq->errors = 1;
if (time_after(jiffies, info->write_timeout))
do_end_request = 1;
else {
struct request_queue *q = drive->queue;
unsigned long flags;
/*
* take a breather relying on the unplug
* timer to kick us again
*/
spin_lock_irqsave(q->queue_lock, flags);
blk_plug_device(q);
spin_unlock_irqrestore(q->queue_lock, flags);
return 1;
}
}
} else if (sense_key == UNIT_ATTENTION) {
/* media change */
cdrom_saw_media_change(drive);
/*
* Arrange to retry the request but be sure to give up
* if we've retried too many times.
*/
if (++rq->errors > ERROR_MAX)
do_end_request = 1;
} else if (sense_key == ILLEGAL_REQUEST ||
sense_key == DATA_PROTECT) {
/*
* No point in retrying after an illegal request or data
* protect error.
*/
ide_dump_status_no_sense(drive, "command error", stat);
do_end_request = 1;
} else if (sense_key == MEDIUM_ERROR) {
/*
* No point in re-trying a zillion times on a bad
* sector. If we got here the error is not correctable.
*/
ide_dump_status_no_sense(drive,
"media error (bad sector)",
stat);
do_end_request = 1;
} else if (sense_key == BLANK_CHECK) {
/* disk appears blank ?? */
ide_dump_status_no_sense(drive, "media error (blank)",
stat);
do_end_request = 1;
} else if ((err & ~ATA_ABORTED) != 0) {
/* go to the default handler for other errors */
ide_error(drive, "cdrom_decode_status", stat);
return 1;
} else if ((++rq->errors > ERROR_MAX)) {
/* we've racked up too many retries, abort */
do_end_request = 1;
}
/*
* End a request through request sense analysis when we have
* sense data. We need this in order to perform end of media
* processing.
*/
if (do_end_request)
goto end_request;
/*
* If we got a CHECK_CONDITION status, queue
* a request sense command.
*/
if (stat & ATA_ERR)
cdrom_queue_request_sense(drive, NULL, NULL);
} else {
blk_dump_rq_flags(rq, PFX "bad rq");
cdrom_end_request(drive, 0);
}
/* retry, or handle the next request */
return 1;
end_request:
if (stat & ATA_ERR) {
struct request_queue *q = drive->queue;
unsigned long flags;
spin_lock_irqsave(q->queue_lock, flags);
blkdev_dequeue_request(rq);
spin_unlock_irqrestore(q->queue_lock, flags);
hwgroup->rq = NULL;
cdrom_queue_request_sense(drive, rq->sense, rq);
} else
cdrom_end_request(drive, 0);
return 1;
}
static int cdrom_timer_expiry(ide_drive_t *drive)
{
struct request *rq = HWGROUP(drive)->rq;
unsigned long wait = 0;
ide_debug_log(IDE_DBG_RQ, "Call %s: rq->cmd[0]: 0x%x\n", __func__,
rq->cmd[0]);
/*
* Some commands are *slow* and normally take a long time to complete.
* Usually we can use the ATAPI "disconnect" to bypass this, but not all
* commands/drives support that. Let ide_timer_expiry keep polling us
* for these.
*/
switch (rq->cmd[0]) {
case GPCMD_BLANK:
case GPCMD_FORMAT_UNIT:
case GPCMD_RESERVE_RZONE_TRACK:
case GPCMD_CLOSE_TRACK:
case GPCMD_FLUSH_CACHE:
wait = ATAPI_WAIT_PC;
break;
default:
if (!(rq->cmd_flags & REQ_QUIET))
printk(KERN_INFO PFX "cmd 0x%x timed out\n",
rq->cmd[0]);
wait = 0;
break;
}
return wait;
}
/*
* Set up the device registers for transferring a packet command on DEV,
* expecting to later transfer XFERLEN bytes. HANDLER is the routine
* which actually transfers the command to the drive. If this is a
* drq_interrupt device, this routine will arrange for HANDLER to be
* called when the interrupt from the drive arrives. Otherwise, HANDLER
* will be called immediately after the drive is prepared for the transfer.
*/
static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
int xferlen,
ide_handler_t *handler)
{
ide_hwif_t *hwif = drive->hwif;
ide_debug_log(IDE_DBG_PC, "Call %s, xferlen: %d\n", __func__, xferlen);
/* FIXME: for Virtual DMA we must check harder */
if (drive->dma)
drive->dma = !hwif->dma_ops->dma_setup(drive);
/* set up the controller registers */
ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL,
xferlen, drive->dma);
if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
/* waiting for CDB interrupt, not DMA yet. */
if (drive->dma)
drive->waiting_for_dma = 0;
/* packet command */
ide_execute_command(drive, ATA_CMD_PACKET, handler,
ATAPI_WAIT_PC, cdrom_timer_expiry);
return ide_started;
} else {
ide_execute_pkt_cmd(drive);
return (*handler) (drive);
}
}
/*
* Send a packet command to DRIVE described by CMD_BUF and CMD_LEN. The device
* registers must have already been prepared by cdrom_start_packet_command.
* HANDLER is the interrupt handler to call when the command completes or
* there's data ready.
*/
#define ATAPI_MIN_CDB_BYTES 12
static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive,
struct request *rq,
ide_handler_t *handler)
{
ide_hwif_t *hwif = drive->hwif;
int cmd_len;
ide_startstop_t startstop;
ide_debug_log(IDE_DBG_PC, "Call %s\n", __func__);
if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
/*
* Here we should have been called after receiving an interrupt
* from the device. DRQ should how be set.
*/
/* check for errors */
if (cdrom_decode_status(drive, ATA_DRQ, NULL))
return ide_stopped;
/* ok, next interrupt will be DMA interrupt */
if (drive->dma)
drive->waiting_for_dma = 1;
} else {
/* otherwise, we must wait for DRQ to get set */
if (ide_wait_stat(&startstop, drive, ATA_DRQ,
ATA_BUSY, WAIT_READY))
return startstop;
}
/* arm the interrupt handler */
ide_set_handler(drive, handler, rq->timeout, cdrom_timer_expiry);
/* ATAPI commands get padded out to 12 bytes minimum */
cmd_len = COMMAND_SIZE(rq->cmd[0]);
if (cmd_len < ATAPI_MIN_CDB_BYTES)
cmd_len = ATAPI_MIN_CDB_BYTES;
/* send the command to the device */
hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
/* start the DMA if need be */
if (drive->dma)
hwif->dma_ops->dma_start(drive);
return ide_started;
}
/*
* Check the contents of the interrupt reason register from the cdrom
* and attempt to recover if there are problems. Returns 0 if everything's
* ok; nonzero if the request has been terminated.
*/
static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
int len, int ireason, int rw)
{
ide_hwif_t *hwif = drive->hwif;
ide_debug_log(IDE_DBG_FUNC, "Call %s, ireason: 0x%x, rw: 0x%x\n",
__func__, ireason, rw);
/*
* ireason == 0: the drive wants to receive data from us
* ireason == 2: the drive is expecting to transfer data to us
*/
if (ireason == (!rw << 1))
return 0;
else if (ireason == (rw << 1)) {
/* whoops... */
printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
drive->name, __func__);
ide_pad_transfer(drive, rw, len);
} else if (rw == 0 && ireason == 1) {
/*
* Some drives (ASUS) seem to tell us that status info is
* available. Just get it and ignore.
*/
(void)hwif->tp_ops->read_status(hwif);
return 0;
} else {
/* drive wants a command packet, or invalid ireason... */
printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
drive->name, __func__, ireason);
}
if (rq->cmd_type == REQ_TYPE_ATA_PC)
rq->cmd_flags |= REQ_FAILED;
cdrom_end_request(drive, 0);
return -1;
}
/*
* Assume that the drive will always provide data in multiples of at least
* SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise.
*/
static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
{
ide_debug_log(IDE_DBG_FUNC, "Call %s, len: %d\n", __func__, len);
if ((len % SECTOR_SIZE) == 0)
return 0;
printk(KERN_ERR PFX "%s: %s: Bad transfer size %d\n", drive->name,
__func__, len);
if (drive->atapi_flags & IDE_AFLAG_LIMIT_NFRAMES)
printk(KERN_ERR PFX "This drive is not supported by this "
"version of the driver\n");
else {
printk(KERN_ERR PFX "Trying to limit transfer sizes\n");
drive->atapi_flags |= IDE_AFLAG_LIMIT_NFRAMES;
}
return 1;
}
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);
static ide_startstop_t ide_cd_prepare_rw_request(ide_drive_t *drive,
struct request *rq)
{
ide_debug_log(IDE_DBG_RQ, "Call %s: rq->cmd_flags: 0x%x\n", __func__,
rq->cmd_flags);
if (rq_data_dir(rq) == READ) {
unsigned short sectors_per_frame =
queue_hardsect_size(drive->queue) >> SECTOR_BITS;
int nskip = rq->sector & (sectors_per_frame - 1);
/*
* If the requested sector doesn't start on a frame boundary,
* we must adjust the start of the transfer so that it does,
* and remember to skip the first few sectors.
*
* If the rq->current_nr_sectors field is larger than the size
* of the buffer, it will mean that we're to skip a number of
* sectors equal to the amount by which rq->current_nr_sectors
* is larger than the buffer size.
*/
if (nskip > 0) {
/* sanity check... */
if (rq->current_nr_sectors !=
bio_cur_sectors(rq->bio)) {
printk(KERN_ERR PFX "%s: %s: buffer botch (%u)\n",
drive->name, __func__,
rq->current_nr_sectors);
cdrom_end_request(drive, 0);
return ide_stopped;
}
rq->current_nr_sectors += nskip;
}
}
/* set up the command */
rq->timeout = ATAPI_WAIT_PC;
return ide_started;
}
/*
* Routine to send a read/write packet command to the drive. This is usually
* called directly from cdrom_start_{read,write}(). However, for drq_interrupt
* devices, it is called from an interrupt when the drive is ready to accept
* the command.
*/
static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
{
struct request *rq = drive->hwif->hwgroup->rq;
/* send the command to the drive and return */
return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
}
/*
* Fix up a possibly partially-processed request so that we can start it over
* entirely, or even put it back on the request queue.
*/
static void ide_cd_restore_request(ide_drive_t *drive, struct request *rq)
{
ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
if (rq->buffer != bio_data(rq->bio)) {
sector_t n =
(rq->buffer - (char *)bio_data(rq->bio)) / SECTOR_SIZE;
rq->buffer = bio_data(rq->bio);
rq->nr_sectors += n;
rq->sector -= n;
}
rq->current_nr_sectors = bio_cur_sectors(rq->bio);
rq->hard_cur_sectors = rq->current_nr_sectors;
rq->hard_nr_sectors = rq->nr_sectors;
rq->hard_sector = rq->sector;
rq->q->prep_rq_fn(rq->q, rq);
}
static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct request *rq)
{
ide_debug_log(IDE_DBG_FUNC, "Call %s, rq->cmd[0]: 0x%x\n",
__func__, rq->cmd[0]);
/*
* Some of the trailing request sense fields are optional,
* and some drives don't send them. Sigh.
*/
if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
rq->data_len > 0 && rq->data_len <= 5)
while (rq->data_len > 0) {
*(u8 *)rq->data++ = 0;
--rq->data_len;
}
}
int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
int write, void *buffer, unsigned *bufflen,
struct request_sense *sense, int timeout,
unsigned int cmd_flags)
{
struct cdrom_info *info = drive->driver_data;
struct request_sense local_sense;
int retries = 10;
unsigned int flags = 0;
if (!sense)
sense = &local_sense;
ide_debug_log(IDE_DBG_PC, "Call %s, cmd[0]: 0x%x, write: 0x%x, "
"timeout: %d, cmd_flags: 0x%x\n", __func__, cmd[0], write,
timeout, cmd_flags);
/* start of retry loop */
do {
struct request *rq;
int error;
rq = blk_get_request(drive->queue, write, __GFP_WAIT);
memcpy(rq->cmd, cmd, BLK_MAX_CDB);
rq->cmd_type = REQ_TYPE_ATA_PC;
rq->sense = sense;
rq->cmd_flags |= cmd_flags;
rq->timeout = timeout;
if (buffer) {
rq->data = buffer;
rq->data_len = *bufflen;
}
error = blk_execute_rq(drive->queue, info->disk, rq, 0);
if (buffer)
*bufflen = rq->data_len;
flags = rq->cmd_flags;
blk_put_request(rq);
/*
* FIXME: we should probably abort/retry or something in case of
* failure.
*/
if (flags & REQ_FAILED) {
/*
* The request failed. Retry if it was due to a unit
* attention status (usually means media was changed).
*/
struct request_sense *reqbuf = sense;
if (reqbuf->sense_key == UNIT_ATTENTION)
cdrom_saw_media_change(drive);
else if (reqbuf->sense_key == NOT_READY &&
reqbuf->asc == 4 && reqbuf->ascq != 4) {
/*
* The drive is in the process of loading
* a disk. Retry, but wait a little to give
* the drive time to complete the load.
*/
ssleep(2);
} else {
/* otherwise, don't retry */
retries = 0;
}
--retries;
}
/* end of retry loop */
} while ((flags & REQ_FAILED) && retries >= 0);
/* return an error if the command failed */
return (flags & REQ_FAILED) ? -EIO : 0;
}
/*
* Called from blk_end_request_callback() after the data of the request is
* completed and before the request itself is completed. By returning value '1',
* blk_end_request_callback() returns immediately without completing it.
*/
static int cdrom_newpc_intr_dummy_cb(struct request *rq)
{
return 1;
}
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
ide_hwgroup_t *hwgroup = hwif->hwgroup;
struct request *rq = hwgroup->rq;
xfer_func_t *xferfunc;
ide_expiry_t *expiry = NULL;
int dma_error = 0, dma, stat, thislen, uptodate = 0;
int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
unsigned int timeout;
u16 len;
u8 ireason;
ide_debug_log(IDE_DBG_PC, "Call %s, rq->cmd[0]: 0x%x, write: 0x%x\n",
__func__, rq->cmd[0], write);
/* check for errors */
dma = drive->dma;
if (dma) {
drive->dma = 0;
dma_error = hwif->dma_ops->dma_end(drive);
if (dma_error) {
printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
write ? "write" : "read");
ide_dma_off(drive);
}
}
if (cdrom_decode_status(drive, 0, &stat))
return ide_stopped;
/* using dma, transfer is complete now */
if (dma) {
if (dma_error)
return ide_error(drive, "dma error", stat);
if (blk_fs_request(rq)) {
ide_end_request(drive, 1, rq->nr_sectors);
return ide_stopped;
}
goto end_request;
}
ide_read_bcount_and_ireason(drive, &len, &ireason);
thislen = blk_fs_request(rq) ? len : rq->data_len;
if (thislen > len)
thislen = len;
ide_debug_log(IDE_DBG_PC, "%s: DRQ: stat: 0x%x, thislen: %d\n",
__func__, stat, thislen);
/* If DRQ is clear, the command has completed. */
if ((stat & ATA_DRQ) == 0) {
if (blk_fs_request(rq)) {
/*
* If we're not done reading/writing, complain.
* Otherwise, complete the command normally.
*/
uptodate = 1;
if (rq->current_nr_sectors > 0) {
printk(KERN_ERR PFX "%s: %s: data underrun "
"(%d blocks)\n",
drive->name, __func__,
rq->current_nr_sectors);
if (!write)
rq->cmd_flags |= REQ_FAILED;
uptodate = 0;
}
cdrom_end_request(drive, uptodate);
return ide_stopped;
} else if (!blk_pc_request(rq)) {
ide_cd_request_sense_fixup(drive, rq);
/* complain if we still have data left to transfer */
uptodate = rq->data_len ? 0 : 1;
}
goto end_request;
}
/* check which way to transfer data */
if (ide_cd_check_ireason(drive, rq, len, ireason, write))
return ide_stopped;
if (blk_fs_request(rq)) {
if (write == 0) {
int nskip;
if (ide_cd_check_transfer_size(drive, len)) {
cdrom_end_request(drive, 0);
return ide_stopped;
}
/*
* First, figure out if we need to bit-bucket
* any of the leading sectors.
*/
nskip = min_t(int, rq->current_nr_sectors