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Merge branch 'bp-remove-pc-buf' into for-next
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Conflicts:
	drivers/ide/ide-tape.c
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Bartlomiej Zolnierkiewicz committed Jun 13, 2009
2 parents f3ad116 + 103f703 commit 8dcce40
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Showing 6 changed files with 230 additions and 261 deletions.
138 changes: 87 additions & 51 deletions drivers/ide/ide-atapi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,9 @@

#include <scsi/scsi.h>

#define DRV_NAME "ide-atapi"
#define PFX DRV_NAME ": "

#ifdef DEBUG
#define debug_log(fmt, args...) \
printk(KERN_INFO "ide: " fmt, ## args)
Expand Down Expand Up @@ -74,8 +77,6 @@ EXPORT_SYMBOL_GPL(ide_check_atapi_device);
void ide_init_pc(struct ide_atapi_pc *pc)
{
memset(pc, 0, sizeof(*pc));
pc->buf = pc->pc_buf;
pc->buf_size = IDE_PC_BUFFER_SIZE;
}
EXPORT_SYMBOL_GPL(ide_init_pc);

Expand All @@ -84,7 +85,7 @@ EXPORT_SYMBOL_GPL(ide_init_pc);
* and wait for it to be serviced.
*/
int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
struct ide_atapi_pc *pc)
struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
{
struct request *rq;
int error;
Expand All @@ -93,8 +94,8 @@ int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->special = (char *)pc;

if (pc->req_xfer) {
error = blk_rq_map_kern(drive->queue, rq, pc->buf, pc->req_xfer,
if (buf && bufflen) {
error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
GFP_NOIO);
if (error)
goto put_req;
Expand All @@ -117,7 +118,7 @@ int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
ide_init_pc(&pc);
pc.c[0] = TEST_UNIT_READY;

return ide_queue_pc_tail(drive, disk, &pc);
return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
}
EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);

Expand All @@ -132,7 +133,7 @@ int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
if (drive->media == ide_tape)
pc.flags |= PC_FLAG_WAIT_FOR_DSC;

return ide_queue_pc_tail(drive, disk, &pc);
return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
}
EXPORT_SYMBOL_GPL(ide_do_start_stop);

Expand All @@ -147,7 +148,7 @@ int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
pc.c[0] = ALLOW_MEDIUM_REMOVAL;
pc.c[4] = on;

return ide_queue_pc_tail(drive, disk, &pc);
return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
}
EXPORT_SYMBOL_GPL(ide_set_media_lock);

Expand All @@ -172,8 +173,6 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
unsigned int cmd_len, sense_len;
int err;

debug_log("%s: enter\n", __func__);

switch (drive->media) {
case ide_floppy:
cmd_len = 255;
Expand Down Expand Up @@ -201,8 +200,8 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
GFP_NOIO);
if (unlikely(err)) {
if (printk_ratelimit())
printk(KERN_WARNING "%s: failed to map sense buffer\n",
drive->name);
printk(KERN_WARNING PFX "%s: failed to map sense "
"buffer\n", drive->name);
return;
}

Expand All @@ -223,7 +222,7 @@ int ide_queue_sense_rq(ide_drive_t *drive, void *special)
{
/* deferred failure from ide_prep_sense() */
if (!drive->sense_rq_armed) {
printk(KERN_WARNING "%s: failed queue sense request\n",
printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
drive->name);
return -ENOMEM;
}
Expand Down Expand Up @@ -255,8 +254,6 @@ void ide_retry_pc(ide_drive_t *drive)
/* init pc from sense_rq */
ide_init_pc(pc);
memcpy(pc->c, sense_rq->cmd, 12);
pc->buf = bio_data(sense_rq->bio); /* pointer to mapped address */
pc->req_xfer = blk_rq_bytes(sense_rq);

if (drive->media == ide_tape)
drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
Expand Down Expand Up @@ -298,7 +295,7 @@ int ide_cd_expiry(ide_drive_t *drive)
break;
default:
if (!(rq->cmd_flags & REQ_QUIET))
printk(KERN_INFO "cmd 0x%x timed out\n",
printk(KERN_INFO PFX "cmd 0x%x timed out\n",
rq->cmd[0]);
wait = 0;
break;
Expand Down Expand Up @@ -331,6 +328,55 @@ void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
}
EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);

/*
* Check the contents of the interrupt reason register and attempt to recover if
* there are problems.
*
* Returns:
* - 0 if everything's ok
* - 1 if the request has to be terminated.
*/
int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
int ireason, int rw)
{
ide_hwif_t *hwif = drive->hwif;

debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);

if (ireason == (!rw << 1))
return 0;
else if (ireason == (rw << 1)) {
printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
drive->name, __func__);

if (dev_is_idecd(drive))
ide_pad_transfer(drive, rw, len);
} else if (!rw && ireason == ATAPI_COD) {
if (dev_is_idecd(drive)) {
/*
* 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 {
if (ireason & ATAPI_COD)
printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
__func__);

/* 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 (dev_is_idecd(drive) && rq->cmd_type == REQ_TYPE_ATA_PC)
rq->cmd_flags |= REQ_FAILED;

return 1;
}
EXPORT_SYMBOL_GPL(ide_check_ireason);

/*
* This is the usual interrupt handler which will be called during a packet
* command. We will transfer some of the data (as requested by the drive)
Expand Down Expand Up @@ -365,12 +411,12 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)

if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
if (drive->media == ide_floppy)
printk(KERN_ERR "%s: DMA %s error\n",
printk(KERN_ERR PFX "%s: DMA %s error\n",
drive->name, rq_data_dir(pc->rq)
? "write" : "read");
pc->flags |= PC_FLAG_DMA_ERROR;
} else
pc->xferred = pc->req_xfer;
rq->resid_len = 0;
debug_log("%s: DMA finished\n", drive->name);
}

Expand All @@ -379,7 +425,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
int uptodate, error;

debug_log("Packet command completed, %d bytes transferred\n",
pc->xferred);
blk_rq_bytes(rq));

pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;

Expand All @@ -397,8 +443,8 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
pc->rq->errors++;

if (rq->cmd[0] == REQUEST_SENSE) {
printk(KERN_ERR "%s: I/O error in request sense"
" command\n", drive->name);
printk(KERN_ERR PFX "%s: I/O error in request "
"sense command\n", drive->name);
return ide_do_reset(drive);
}

Expand Down Expand Up @@ -446,42 +492,31 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)

if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
printk(KERN_ERR "%s: The device wants to issue more interrupts "
"in DMA mode\n", drive->name);
printk(KERN_ERR PFX "%s: The device wants to issue more "
"interrupts in DMA mode\n", drive->name);
ide_dma_off(drive);
return ide_do_reset(drive);
}

/* Get the number of bytes to transfer on this interrupt. */
ide_read_bcount_and_ireason(drive, &bcount, &ireason);

if (ireason & ATAPI_COD) {
printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
if (ide_check_ireason(drive, rq, bcount, ireason, write))
return ide_do_reset(drive);
}

if (((ireason & ATAPI_IO) == ATAPI_IO) == write) {
/* Hopefully, we will never get here */
printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
"to %s!\n", drive->name,
(ireason & ATAPI_IO) ? "Write" : "Read",
(ireason & ATAPI_IO) ? "Read" : "Write");
return ide_do_reset(drive);
}

done = min_t(unsigned int, bcount, cmd->nleft);
ide_pio_bytes(drive, cmd, write, done);

/* Update transferred byte count */
pc->xferred += done;
rq->resid_len -= done;

bcount -= done;

if (bcount)
ide_pad_transfer(drive, write, bcount);

debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n",
rq->cmd[0], done, bcount);
debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
rq->cmd[0], done, bcount, rq->resid_len);

/* And set the interrupt handler again */
ide_set_handler(drive, ide_pc_intr, timeout);
Expand Down Expand Up @@ -515,13 +550,13 @@ static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)

while (retries-- && ((ireason & ATAPI_COD) == 0 ||
(ireason & ATAPI_IO))) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
"a packet command, retrying\n", drive->name);
udelay(100);
ireason = ide_read_ireason(drive);
if (retries == 0) {
printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
"a packet command, ignoring\n",
printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
" a packet command, ignoring\n",
drive->name);
ireason |= ATAPI_COD;
ireason &= ~ATAPI_IO;
Expand Down Expand Up @@ -552,7 +587,7 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
u8 ireason;

if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
printk(KERN_ERR "%s: Strange, packet command initiated yet "
printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
"DRQ isn't asserted\n", drive->name);
return startstop;
}
Expand Down Expand Up @@ -594,8 +629,8 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
ireason = ide_wait_ireason(drive, ireason);

if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
"a packet command\n", drive->name);
printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
"issuing a packet command\n", drive->name);

return ide_do_reset(drive);
}
Expand Down Expand Up @@ -633,7 +668,7 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
ide_hwif_t *hwif = drive->hwif;
ide_expiry_t *expiry = NULL;
struct request *rq = hwif->rq;
unsigned int timeout;
unsigned int timeout, bytes;
u16 bcount;
u8 valid_tf;
u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
Expand All @@ -649,13 +684,14 @@ ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
} else {
pc = drive->pc;

/* We haven't transferred any data yet */
pc->xferred = 0;

valid_tf = IDE_VALID_DEVICE;
bcount = ((drive->media == ide_tape) ?
pc->req_xfer :
min(pc->req_xfer, 63 * 1024));
bytes = blk_rq_bytes(rq);
bcount = ((drive->media == ide_tape) ? bytes
: min_t(unsigned int,
bytes, 63 * 1024));

/* We haven't transferred any data yet */
rq->resid_len = bcount;

if (pc->flags & PC_FLAG_DMA_ERROR) {
pc->flags &= ~PC_FLAG_DMA_ERROR;
Expand Down
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