Re: PATCH: [2.4.21-pre3] IDE error recovery

Ross Biro
2003-01-14T17:01:00Z

I knew this was going to be a problem.

ATA-6 no longer allows a device to claim ATA-2 compatibility. The bit
is obsolete.
ATA-3 does not allow IDLE IMMEDIATE. We need to changre the error
recovery depending on which bits are set.

ATA-6 => use srst
ATA-2 => idle immediate

Anything else is probably srst as well.

One of the drives that has trouble claims ATA-2 through ATA-6, which is
interesting, This means this device claims to support ATA-5, hence we
should be able to interpret the bits in the Identify device according to
ATA-5 which means it supports ATA-2 which it clearly does not. Only 1
of the 3 different drives I've looked at gets it right and does not
claim ATA-2 support when it does not support it. I'll drop an email to
a couple of manufacturers and let them know their drives have a problem.

Ross

Andre Hedrick wrote:

>Whoa, you need to check whic spec you are refering to first.
>
> Model=FUJITSU MHJ2181AT, FwRev=D034, SerialNo=01001697
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> BuffType=unknown, BuffSize=512kB, MaxMultSect=16, MultSect=16
> CurCHS=17475/15/63, CurSects=-78446341, LBA=yes, LBAsects=35433216
> IORDY=yes, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
> PIO modes: pio0 pio1 pio2 pio3 pio4
> DMA modes: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4
> AdvancedPM=yes: disabled (255)
> Drive Supports : Reserved : ATA-2 ATA-3 ATA-4 ATA-5
> Kernel Drive Geometry LogicalCHS=2205/255/63 PhysicalCHS=37495/15/63
>
>This drive claims ATA2-5 support, and thus it accepts the status quo.
>Where are you finding the violations?
>If the drive vendor states a range of support they are in violation.
>This is clearly the point where the driver core needs to have a
>
> unsinged long drive->support_bits
>
>The mess this is going to create.
>
>Cheers,
>
>On Mon, 13 Jan 2003, Ross Biro wrote:
>
>
>
>>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) \
>> { \
>>
>>
>>
>>
>
>Andre Hedrick
>LAD Storage Consulting Group
>
>
>