libata: Whitelist SSDs that are known to properly return zeroes after TRIM

[ Upstream commit e61f7d1c3c07a7e51036b0796749edb00deff845 ]

As defined, the DRAT (Deterministic Read After Trim) and RZAT (Return
Zero After Trim) flags in the ATA Command Set are unreliable in the
sense that they only define what happens if the device successfully
executed the DSM TRIM command. TRIM is only advisory, however, and the
device is free to silently ignore all or parts of the request.

In practice this renders the DRAT and RZAT flags completely useless and
because the results are unpredictable we decided to disable discard in
MD for 3.18 to avoid the risk of data corruption.

Hardware vendors in the real world obviously need better guarantees than
what the standards bodies provide. Unfortuntely those guarantees are
encoded in product requirements documents rather than somewhere we can
key off of them programatically. So we are compelled to disabling
discard_zeroes_data for all devices unless we explicitly have data to
support whitelisting them.

This patch whitelists SSDs from a few of the main vendors. None of the
whitelists are based on written guarantees. They are purely based on
empirical evidence collected from internal and external users that have
tested or qualified these drives in RAID deployments.

The whitelist is only meant as a starting point and is by no means
comprehensive:

   - All intel SSD models except for 510
   - Micron M5?0/M600
   - Samsung SSDs
   - Seagate SSDs

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 98dc0dc605bc838c771dbaa8df5b8bb68f6dda53..a3bc10cb226193009edd6fff27aad27382e6eb71 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4226,10 +4226,33 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
        { "PIONEER DVD-RW  DVR-216D",   NULL,   ATA_HORKAGE_NOSETXFER },
 
        /* devices that don't properly handle queued TRIM commands */
-       { "Micron_M500*",               NULL,   ATA_HORKAGE_NO_NCQ_TRIM, },
-       { "Crucial_CT???M500SSD*",      NULL,   ATA_HORKAGE_NO_NCQ_TRIM, },
-       { "Micron_M550*",               NULL,   ATA_HORKAGE_NO_NCQ_TRIM, },
-       { "Crucial_CT*M550SSD*",        NULL,   ATA_HORKAGE_NO_NCQ_TRIM, },
+       { "Micron_M[56]*",              NULL,   ATA_HORKAGE_NO_NCQ_TRIM |
+                                               ATA_HORKAGE_ZERO_AFTER_TRIM, },
+       { "Crucial_CT*SSD*",            NULL,   ATA_HORKAGE_NO_NCQ_TRIM, },
+
+       /*
+        * As defined, the DRAT (Deterministic Read After Trim) and RZAT
+        * (Return Zero After Trim) flags in the ATA Command Set are
+        * unreliable in the sense that they only define what happens if
+        * the device successfully executed the DSM TRIM command. TRIM
+        * is only advisory, however, and the device is free to silently
+        * ignore all or parts of the request.
+        *
+        * Whitelist drives that are known to reliably return zeroes
+        * after TRIM.
+        */
+
+       /*
+        * The intel 510 drive has buggy DRAT/RZAT. Explicitly exclude
+        * that model before whitelisting all other intel SSDs.
+        */
+       { "INTEL*SSDSC2MH*",            NULL,   0, },
+
+       { "INTEL*SSD*",                 NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
+       { "SSD*INTEL*",                 NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
+       { "Samsung*SSD*",               NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
+       { "SAMSUNG*SSD*",               NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
+       { "ST[1248][0248]0[FH]*",       NULL,   ATA_HORKAGE_ZERO_AFTER_TRIM, },
 
        /* devices that don't properly handle TRIM commands */
        { "SuperSSpeed S238*",          NULL,   ATA_HORKAGE_NOTRIM, },

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 0586f66d70fad3a52e37e2cc87bc6c5de5e8ec7c..a19479282b65dbbaef7b2df2c857f99077778ea1 100644 (file)
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2515,13 +2515,15 @@ static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
                rbuf[15] = lowest_aligned;
 
                if (ata_id_has_trim(args->id)) {
-                       rbuf[14] |= 0x80; /* TPE */
+                       rbuf[14] |= 0x80; /* LBPME */
 
-                       if (ata_id_has_zero_after_trim(args->id))
-                               rbuf[14] |= 0x40; /* TPRZ */
+                       if (ata_id_has_zero_after_trim(args->id) &&
+                           dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) {
+                               ata_dev_info(dev, "Enabling discard_zeroes_data\n");
+                               rbuf[14] |= 0x40; /* LBPRZ */
+                       }
                }
        }
-
        return 0;
 }
 

diff --git a/include/linux/libata.h b/include/linux/libata.h
index b3a816f4c0c4a26bdda254c81bd0a0dc43da571b..c79583dc6ca8e1ee60eb1a1dccb80a5784d15b95 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -429,6 +429,7 @@ enum {
        ATA_HORKAGE_NO_NCQ_TRIM = (1 << 19),    /* don't use queued TRIM */
        ATA_HORKAGE_NOLPM       = (1 << 20),    /* don't use LPM */
        ATA_HORKAGE_WD_BROKEN_LPM = (1 << 21),  /* some WDs have broken LPM */
+       ATA_HORKAGE_ZERO_AFTER_TRIM = (1 << 22),/* guarantees zero after trim */
 
         /* DMA mask for user DMA control: User visible values; DO NOT
            renumber */