path: root/include/linux/libata.h
diff options
authorKate Hsuan <hpa@redhat.com>2021-09-03 17:44:11 +0800
committerJens Axboe <axboe@kernel.dk>2021-09-03 08:06:02 -0600
commit7a8526a5cd51cf5f070310c6c37dd7293334ac49 (patch)
treee17d9d36fcbc8fe4094a5bee87517bd13cfe591f /include/linux/libata.h
parentlibata: add ATA_HORKAGE_NO_NCQ_TRIM for Samsung 860 and 870 SSDs (diff)
libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860 and 870 SSD.
Many users are reporting that the Samsung 860 and 870 SSD are having various issues when combined with AMD/ATI (vendor ID 0x1002) SATA controllers and only completely disabling NCQ helps to avoid these issues. Always disabling NCQ for Samsung 860/870 SSDs regardless of the host SATA adapter vendor will cause I/O performance degradation with well behaved adapters. To limit the performance impact to ATI adapters, introduce the ATA_HORKAGE_NO_NCQ_ON_ATI flag to force disable NCQ only for these adapters. Also, two libata.force parameters (noncqati and ncqati) are introduced to disable and enable the NCQ for the system which equipped with ATI SATA adapter and Samsung 860 and 870 SSDs. The user can determine NCQ function to be enabled or disabled according to the demand. After verifying the chipset from the user reports, the issue appears on AMD/ATI SB7x0/SB8x0/SB9x0 SATA Controllers and does not appear on recent AMD SATA adapters. The vendor ID of ATI should be 0x1002. Therefore, ATA_HORKAGE_NO_NCQ_ON_AMD was modified to ATA_HORKAGE_NO_NCQ_ON_ATI. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=201693 Signed-off-by: Kate Hsuan <hpa@redhat.com> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20210903094411.58749-1-hpa@redhat.com Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/libata.h')
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 860e63f5667b..c0c64f03e107 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -426,6 +426,7 @@ enum {
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 */
+ ATA_HORKAGE_NO_NCQ_ON_ATI = (1 << 27), /* Disable NCQ on ATI chipset */
/* DMA mask for user DMA control: User visible values; DO NOT
renumber */