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SubjectPATCH: [2.4.21-pre3] IDE error recovery

Take this patch with a big grain of salt.

The current IDE error recovery code will send a IDLEIMMEDIATE in the
case when a drive is still busy or has drq set during an error. This is
a violation of the ATA spec and hoses up quite a few drives. The
prefered form of error recovery seems to be a soft reset followed by a
set features. This patch replaces the IDLEIMMEDIATE with a reset, but
does not do the set features. The set features should not be necessary,
but at least one drive vendor does most of their testing with the set
features. OK_TO_RESET_CONTROLLER must be set to 1 if this patch is applied.

I've modified the google kernel to add a desired_speed to ide_drive_t
and check to see if current_speed != desired_speed before every read or
write request. This causes a set features after a reset. I can provide
patches to do something similiar for 2.4.21, but I'm not sure it's
appropriate. There are bugs in the way hdparm -X is handled in 2.4.20,
and this patch would fix them as well, but it may be too large of a
patch for a stable kernel.

This also fixes drive_cmd_intr to do a little better checking to make
sure the device is ready. The spec requires this, but any device that
sends an interrupt before it's ready is probably broken.

I have no idea what impact this will have on older devices or non disks.

This patch has only been minimally tested.

----- snip -------
diff -durbB linux-2.4.20-p1/drivers/ide/ide-cd.c
linux-2.4.20-p2/drivers/ide/ide-cd.c
--- linux-2.4.20-p1/drivers/ide/ide-cd.c Wed Jan 8 16:25:04 2003
+++ linux-2.4.20-p2/drivers/ide/ide-cd.c Thu Jan 9 11:38:22 2003
@@ -644,7 +644,11 @@
}
if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) {
/* force an abort */
- HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
+ /* This violates the ATA Spec and causes trouble for
+ many modern hard drives. I'm not sure if it is
necessary
+ for older devices or even modern cd-roms. -- RAB
+ HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG); */
+ rq->errors |= ERROR_RESET;
}
if (rq->errors >= ERROR_MAX) {
DRIVER(drive)->end_request(drive, 0);
diff -durbB linux-2.4.20-p1/drivers/ide/ide-disk.c
linux-2.4.20-p2/drivers/ide/ide-disk.c
--- linux-2.4.20-p1/drivers/ide/ide-disk.c Wed Jan 8 16:25:17 2003
+++ linux-2.4.20-p2/drivers/ide/ide-disk.c Thu Jan 9 11:40:20 2003
@@ -943,7 +943,11 @@
}
if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) {
/* force an abort */
- hwif->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
+ /* This violates the ATA Spec and causes trouble for
+ many modern hard drives. I'm not sure if it is
necessary
+ for older devices or even other modern devices. -- RAB
+ hwif->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG); */
+ rq->errors |= ERROR_RESET;
}
if (rq->errors >= ERROR_MAX)
DRIVER(drive)->end_request(drive, 0);
diff -durbB linux-2.4.20-p1/drivers/ide/ide-io.c
linux-2.4.20-p2/drivers/ide/ide-io.c
--- linux-2.4.20-p1/drivers/ide/ide-io.c Wed Jan 8 16:25:37 2003
+++ linux-2.4.20-p2/drivers/ide/ide-io.c Mon Jan 13 18:01:52 2003
@@ -328,7 +328,12 @@
}
if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) {
/* force an abort */
+ /* This violates the ATA Spec and causes trouble for
+ many modern hard drives. I'm not sure if it is
necessary
+ for older devices or even other modern ata devices
-- RAB
hwif->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
+ */
+ rq->errors |= ERROR_RESET;
}
if (rq->errors >= ERROR_MAX) {
if (drive->driver != NULL)
@@ -397,18 +402,63 @@
struct request *rq = HWGROUP(drive)->rq;
ide_hwif_t *hwif = HWIF(drive);
u8 *args = (u8 *) rq->buffer;
- u8 stat = hwif->INB(IDE_STATUS_REG);
+ u8 stat;
int retries = 10;

+ /* The ATA-6 spec requires a 400ns wait when entering the
+ HPIOI1: Check_status State from the HI4 state. We should
+ only get here coming from the HPIOI0 INTRQ_wait state, but
+ better safe than sorry. The spec also says a read of the
+ alt status register accomplishes this wait. */
+ if (IDE_CONTROL_REG)
+ (void)hwif->INB(IDE_ALTSTATUS_REG);
+ else
+ ide_delay_400ns();
+
+ /* The ATA-6 spec says that the should enter the check status
+ state when it get's an interrupt for a drive command, so
+ technically, the device can send an interrupt before it has
+ finished. I would consider any device that does this to be
+ broken, but the spec allows it. --RAB 1/10/03 */
+ stat = hwif->INB(IDE_STATUS_REG);
+ if (stat & BUSY_STAT) {
+ /* We are just supposed to poll from here on out. */
+ if (HWGROUP(drive)->poll_timeout == 0) {
+
HWGROUP(drive)->poll_timeout=WAIT_CMD/CMD_POLL_TICKS;
+ } else if (--HWGROUP(drive)->poll_timeout == 0) {
+ return DRIVER(drive)->error(drive,
+ "drive_cmd timeout",
+ stat);
+ }
+ ide_set_handler(drive, drive_cmd_intr, CMD_POLL_TICKS,
NULL);
+ return ide_started;
+ }
+
local_irq_enable();
- if ((stat & DRQ_STAT) && args && args[3]) {
+
+ /* We want to make sure that the device and the command
+ both agree on wether or not data is returned by the command
+ that was just issued. If they do not, it is an error. */
+ if (args && args[3]) {
u8 io_32bit = drive->io_32bit;
+ /* The software expects some data back. If the drive does
+ not, then it is an error. */
+ if (!(stat & DRQ_STAT)) {
+ return DRIVER(drive)->error(drive, "drive_cmd
no data", stat);
+ }
drive->io_32bit = 0;
hwif->ata_input_data(drive, &args[4], args[3] * SECTOR_WORDS);
drive->io_32bit = io_32bit;
while (((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
retries--)
udelay(100);
+ } else {
+ /* The software does not expect data, so if the drive
+ returns some, then it's an error. */
+ if (stat & DRQ_STAT) {
+ return DRIVER(drive)->error(drive, "drive_cmd
unexpected data", stat);
+ }
}
+

if (!OK_STAT(stat, READY_STAT, BAD_STAT))
return DRIVER(drive)->error(drive, "drive_cmd", stat);
diff -durbB linux-2.4.20-p1/drivers/ide/ide-taskfile.c
linux-2.4.20-p2/drivers/ide/ide-taskfile.c
--- linux-2.4.20-p1/drivers/ide/ide-taskfile.c Wed Jan 8 16:25:43 2003
+++ linux-2.4.20-p2/drivers/ide/ide-taskfile.c Fri Jan 10 11:19:07 2003
@@ -485,7 +485,13 @@
}
if (hwif->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT)) {
/* force an abort */
- hwif->OUTB(WIN_IDLEIMMEDIATE, IDE_COMMAND_REG);
+ /* This violates the ATA Spec and causes trouble for
+ many modern hard drives. I'm not sure if it is
necessary
+ for older devices or even other modern ata devices
-- RAB
+ hwif->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
+ */
+ rq->errors |= ERROR_RESET;
+
}
if (rq->errors >= ERROR_MAX) {
DRIVER(drive)->end_request(drive, 0);
diff -durbB linux-2.4.20-p1/include/linux/ide.h
linux-2.4.20-p2/include/linux/ide.h
--- linux-2.4.20-p1/include/linux/ide.h Thu Jan 9 15:37:22 2003
+++ linux-2.4.20-p2/include/linux/ide.h Mon Jan 13 18:04:47 2003
@@ -271,6 +271,10 @@
#define WAIT_WORSTCASE (30*HZ) /* 30sec - worst case when
spinning up */
#define WAIT_CMD (10*HZ) /* 10sec - maximum wait for an IRQ to
happen */
#define WAIT_MIN_SLEEP (2*HZ/100) /* 20msec - minimum sleep time */
+#define CMD_POLL_TICKS (1) /* How long to wait in ticks between
+ status checks for a drive cmd
+ that set it's interrupt before it
+ was complete. */

#define HOST(hwif,chipset) \
{ \

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