From: Tejun Heo tj@kernel.org
commit 3b5455636fe26ea21b4189d135a424a6da016418 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/ata/libata-core.c | 5 ++--- drivers/ata/libata-scsi.c | 8 +++++++- include/linux/libata.h | 1 + 3 files changed, 10 insertions(+), 4 deletions(-)
--- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4492,9 +4492,8 @@ static const struct ata_blacklist_entry /* 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, }, --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -2391,6 +2391,7 @@ static unsigned int ata_scsiop_inq_89(st
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; @@ -2416,7 +2417,12 @@ static unsigned int ata_scsiop_inq_b0(st * 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]); }
--- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -439,6 +439,7 @@ 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 */