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libata: implement ATA_HORKAGE_MAX_TRIM_128M and apply to Sandisks

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All three generations of Sandisk SSDs lock up hard intermittently.
Experiments showed that disabling NCQ lowered the failure rate significantly
and the kernel has been disabling NCQ for some models of SD7's and 8's,
which is obviously undesirable.

Karthik worked with Sandisk to root cause the hard lockups to trim commands
larger than 128M. This patch implements ATA_HORKAGE_MAX_TRIM_128M which
limits max trim size to 128M and applies it to all three generations of
Sandisk SSDs.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Karthik Shivaram <karthikgs@fb.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2020-09-02 12:32:45 -04:00 committed by Jens Axboe
parent e276c9bd14
commit 3b5455636f
3 changed files with 10 additions and 4 deletions
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5
drivers/ata/libata-core.c
View file

@ -3868,9 +3868,8 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
{ "C300-CTFDDAC128MAG", "0001", ATA_HORKAGE_NONCQ, },
/* Some Sandisk SSDs lock up hard with NCQ enabled. Reported on
SD7SN6S256G and SD8SN8U256G */
{ "SanDisk SD[78]SN*G", NULL, ATA_HORKAGE_NONCQ, },
/* Sandisk SD7/8/9s lock up hard on large trims */
{ "SanDisk SD[789]*", NULL, ATA_HORKAGE_MAX_TRIM_128M, },
/* devices which puke on READ_NATIVE_MAX */
{ "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },

8
drivers/ata/libata-scsi.c
View file

@ -2080,6 +2080,7 @@ static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
{
struct ata_device *dev = args->dev;
u16 min_io_sectors;
rbuf[1] = 0xb0;
@ -2105,7 +2106,12 @@ static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
* with the unmap bit set.
*/
if (ata_id_has_trim(args->id)) {
put_unaligned_be64(65535 * ATA_MAX_TRIM_RNUM, &rbuf[36]);
u64 max_blocks = 65535 * ATA_MAX_TRIM_RNUM;
if (dev->horkage & ATA_HORKAGE_MAX_TRIM_128M)
max_blocks = 128 << (20 - SECTOR_SHIFT);
put_unaligned_be64(max_blocks, &rbuf[36]);
put_unaligned_be32(1, &rbuf[28]);
}

1
include/linux/libata.h
View file

@ -421,6 +421,7 @@ enum {
ATA_HORKAGE_NO_DMA_LOG = (1 << 23), /* don't use DMA for log read */
ATA_HORKAGE_NOTRIM = (1 << 24), /* don't use TRIM */
ATA_HORKAGE_MAX_SEC_1024 = (1 << 25), /* Limit max sects to 1024 */
ATA_HORKAGE_MAX_TRIM_128M = (1 << 26), /* Limit max trim size to 128M */
/* DMA mask for user DMA control: User visible values; DO NOT
renumber */