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ide-cd.c
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ide-cd.c
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/*
* ATAPI CD-ROM driver.
*
* Copyright (C) 1994-1996 Scott Snyder <[email protected]>
* Copyright (C) 1996-1998 Erik Andersen <[email protected]>
* Copyright (C) 1998-2000 Jens Axboe <[email protected]>
* 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. ;-)
*
* Documentation:
* Mt. Fuji (SFF8090 version 4) and ATAPI (SFF-8020i rev 2.6) standards.
*
* 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"
static DEFINE_MUTEX(idecd_ref_mutex);
static void ide_cd_release(struct device *);
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
get_device(&cd->dev);
}
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);
put_device(&cd->dev);
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, "sense_key: 0x%x", 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, "error_code: 0x%x, sense_key: 0x%x",
sense->error_code, sense->sense_key);
if (failed_command)
ide_debug_log(IDE_DBG_SENSE, "failed cmd: 0x%x",
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);
/*
* The SCSI specification allows for the value
* returned by READ CAPACITY to be up to 75 2K
* sectors past the last readable block.
* Therefore, if we hit a medium error within the
* last 75 2K sectors, we decrease the saved size
* value.
*/
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 = &drive->request_sense_rq;
ide_debug_log(IDE_DBG_SENSE, "enter");
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",
failed_command->cmd[0]);
drive->hwif->rq = NULL;
elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
}
static void ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
{
/*
* 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);
if (ide_end_rq(drive, failed, -EIO, blk_rq_bytes(failed)))
BUG();
} else
cdrom_analyze_sense_data(drive, NULL, sense);
}
/*
* Returns:
* 0: if the request should be continued.
* 1: if the request will be going through error recovery.
* 2: if the request should be ended.
*/
static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = hwif->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;
ide_debug_log(IDE_DBG_RQ, "stat: 0x%x, good_stat: 0x%x, cmd[0]: 0x%x, "
"rq->cmd_type: 0x%x, err: 0x%x",
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;
return 2;
} 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(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(drive, "media error (bad sector)",
stat);
do_end_request = 1;
} else if (sense_key == BLANK_CHECK) {
/* disk appears blank ?? */
ide_dump_status(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);
return 1;
} else {
blk_dump_rq_flags(rq, PFX "bad rq");
return 2;
}
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);
hwif->rq = NULL;
cdrom_queue_request_sense(drive, rq->sense, rq);
return 1;
} else
return 2;
}
/*
* 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, "ireason: 0x%x, rw: 0x%x", 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;
return -1;
}
static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct request *rq)
{
ide_debug_log(IDE_DBG_FUNC, "rq->cmd[0]: 0x%x", 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, "cmd[0]: 0x%x, write: 0x%x, timeout: %d, "
"cmd_flags: 0x%x",
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;
}
static void ide_cd_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
{
unsigned int nr_bytes = cmd->nbytes - cmd->nleft;
if (cmd->tf_flags & IDE_TFLAG_WRITE)
nr_bytes -= cmd->last_xfer_len;
if (nr_bytes > 0)
ide_complete_rq(drive, 0, nr_bytes);
}
/*
* 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;
struct ide_cmd *cmd = &hwif->cmd;
struct request *rq = hwif->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, rc, nsectors;
int sense = blk_sense_request(rq);
unsigned int timeout;
u16 len;
u8 ireason;
ide_debug_log(IDE_DBG_PC, "cmd[0]: 0x%x, write: 0x%x",
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);
}
}
rc = cdrom_decode_status(drive, 0, &stat);
if (rc) {
if (rc == 2)
goto out_end;
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_complete_rq(drive, 0, rq->nr_sectors
? (rq->nr_sectors << 9) : ide_rq_bytes(rq));
return ide_stopped;
} else if (rq->cmd_type == REQ_TYPE_ATA_PC && !rq->bio) {
ide_complete_rq(drive, 0, 512);
return ide_stopped;
}
if (blk_pc_request(rq) == 0 && uptodate == 0)
rq->cmd_flags |= REQ_FAILED;
goto out_end;
}
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, "DRQ: stat: 0x%x, thislen: %d",
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 (cmd->nleft > 0) {
printk(KERN_ERR PFX "%s: %s: data underrun "
"(%u bytes)\n", drive->name, __func__,
cmd->nleft);
if (!write)
rq->cmd_flags |= REQ_FAILED;
uptodate = 0;
}
} 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;
if (uptodate == 0)
rq->cmd_flags |= REQ_FAILED;
}
goto out_end;
}
/* check which way to transfer data */
rc = ide_cd_check_ireason(drive, rq, len, ireason, write);
if (rc)
goto out_end;
cmd->last_xfer_len = 0;
if (ireason == 0) {
write = 1;
xferfunc = hwif->tp_ops->output_data;
} else {
write = 0;
xferfunc = hwif->tp_ops->input_data;
}
ide_debug_log(IDE_DBG_PC, "data transfer, rq->cmd_type: 0x%x, "
"ireason: 0x%x",
rq->cmd_type, ireason);
/* transfer data */
while (thislen > 0) {
u8 *ptr = blk_fs_request(rq) ? NULL : rq->data;
int blen = rq->data_len;
/* bio backed? */
if (rq->bio) {
if (blk_fs_request(rq)) {
blen = min_t(int, thislen, cmd->nleft);
} else {
ptr = bio_data(rq->bio);
blen = bio_iovec(rq->bio)->bv_len;
}
}
if ((blk_fs_request(rq) && cmd->nleft == 0) ||
(blk_fs_request(rq) == 0 && ptr == NULL)) {
if (blk_fs_request(rq) && !write)
/*
* If the buffers are full, pipe the rest into
* oblivion.
*/
ide_pad_transfer(drive, 0, thislen);
else {
printk(KERN_ERR PFX "%s: confused, missing data\n",
drive->name);
blk_dump_rq_flags(rq, rq_data_dir(rq)
? "cdrom_newpc_intr, write"
: "cdrom_newpc_intr, read");
}
break;
}
if (blen > thislen)
blen = thislen;
if (blk_fs_request(rq)) {
ide_pio_bytes(drive, cmd, write, blen);
cmd->last_xfer_len += blen;
} else
xferfunc(drive, NULL, ptr, blen);
thislen -= blen;
len -= blen;
if (blk_fs_request(rq) == 0) {
rq->data_len -= blen;
/*
* The request can't be completed until DRQ is cleared.
* So complete the data, but don't complete the request
* using the dummy function for the callback feature
* of blk_end_request_callback().
*/
if (rq->bio)
blk_end_request_callback(rq, 0, blen,
cdrom_newpc_intr_dummy_cb);
else
rq->data += blen;
}
if (sense && write == 0)
rq->sense_len += blen;
}
/* pad, if necessary */
if (!blk_fs_request(rq) && len > 0)
ide_pad_transfer(drive, write, len);
if (blk_pc_request(rq)) {
timeout = rq->timeout;
} else {
timeout = ATAPI_WAIT_PC;
if (!blk_fs_request(rq))
expiry = ide_cd_expiry;
}
hwif->expiry = expiry;
ide_set_handler(drive, cdrom_newpc_intr, timeout);
return ide_started;
out_end:
if (blk_pc_request(rq) && rc == 0) {
unsigned int dlen = rq->data_len;
if (dma)
rq->data_len = 0;
if (blk_end_request(rq, 0, dlen))
BUG();
hwif->rq = NULL;
} else {
if (sense && uptodate)
ide_cd_complete_failed_rq(drive, rq);
if (blk_fs_request(rq)) {
if (cmd->nleft == 0)
uptodate = 1;
if (uptodate == 0)
ide_cd_error_cmd(drive, cmd);
} else {
if (uptodate <= 0 && rq->errors == 0)
rq->errors = -EIO;
}
/* make sure it's fully ended */
if (blk_pc_request(rq))
nsectors = (rq->data_len + 511) >> 9;
else
nsectors = rq->hard_nr_sectors;
if (nsectors == 0)
nsectors = 1;
ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
if (sense && rc == 2)
ide_error(drive, "request sense failure", stat);
}
return ide_stopped;
}
static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
{
struct cdrom_info *cd = drive->driver_data;
struct request_queue *q = drive->queue;
int write = rq_data_dir(rq) == WRITE;
unsigned short sectors_per_frame =
queue_hardsect_size(q) >> SECTOR_BITS;
ide_debug_log(IDE_DBG_RQ, "rq->cmd[0]: 0x%x, rq->cmd_flags: 0x%x, "
"secs_per_frame: %u",
rq->cmd[0], rq->cmd_flags, sectors_per_frame);
if (write) {
/* disk has become write protected */
if (get_disk_ro(cd->disk))
return ide_stopped;
} else {
/*
* We may be retrying this request after an error. Fix up any
* weirdness which might be present in the request packet.
*/
q->prep_rq_fn(q, rq);
}
/* fs requests *must* be hardware frame aligned */
if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
(rq->sector & (sectors_per_frame - 1)))
return ide_stopped;
/* use DMA, if possible */
drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
if (write)
cd->devinfo.media_written = 1;
rq->timeout = ATAPI_WAIT_PC;
return ide_started;
}
static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
{
ide_debug_log(IDE_DBG_PC, "rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x",
rq->cmd[0], rq->cmd_type);
if (blk_pc_request(rq))
rq->cmd_flags |= REQ_QUIET;
else
rq->cmd_flags &= ~REQ_FAILED;
drive->dma = 0;
/* sg request */
if (rq->bio || ((rq->cmd_type == REQ_TYPE_ATA_PC) && rq->data_len)) {
struct request_queue *q = drive->queue;
unsigned int alignment;
char *buf;
if (rq->bio)
buf = bio_data(rq->bio);
else
buf = rq->data;
drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
/*
* check if dma is safe
*
* NOTE! The "len" and "addr" checks should possibly have
* separate masks.
*/
alignment = queue_dma_alignment(q) | q->dma_pad_mask;
if ((unsigned long)buf & alignment
|| rq->data_len & q->dma_pad_mask
|| object_is_on_stack(buf))
drive->dma = 0;
}
}
static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
sector_t block)
{
struct ide_cmd cmd;
int uptodate = 0, nsectors;
ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, block: %llu",
rq->cmd[0], (unsigned long long)block);
if (drive->debug_mask & IDE_DBG_RQ)
blk_dump_rq_flags(rq, "ide_cd_do_request");
if (blk_fs_request(rq)) {
if (cdrom_start_rw(drive, rq) == ide_stopped)
goto out_end;
} else if (blk_sense_request(rq) || blk_pc_request(rq) ||
rq->cmd_type == REQ_TYPE_ATA_PC) {
if (!rq->timeout)
rq->timeout = ATAPI_WAIT_PC;
cdrom_do_block_pc(drive, rq);
} else if (blk_special_request(rq)) {
/* right now this can only be a reset... */
uptodate = 1;
goto out_end;
} else {
blk_dump_rq_flags(rq, DRV_NAME " bad flags");
if (rq->errors == 0)
rq->errors = -EIO;
goto out_end;
}
memset(&cmd, 0, sizeof(cmd));
if (rq_data_dir(rq))
cmd.tf_flags |= IDE_TFLAG_WRITE;
cmd.rq = rq;
if (blk_fs_request(rq)) {
ide_init_sg_cmd(&cmd, rq->nr_sectors << 9);
ide_map_sg(drive, &cmd);
}
return ide_issue_pc(drive, &cmd);
out_end:
nsectors = rq->hard_nr_sectors;
if (nsectors == 0)
nsectors = 1;
ide_complete_rq(drive, uptodate ? 0 : -EIO, nsectors << 9);
return ide_stopped;
}
/*
* Ioctl handling.
*
* Routines which queue packet commands take as a final argument a pointer to a
* request_sense struct. If execution of the command results in an error with a
* CHECK CONDITION status, this structure will be filled with the results of the
* subsequent request sense command. The pointer can also be NULL, in which case
* no sense information is returned.
*/
static void msf_from_bcd(struct atapi_msf *msf)