9 files changed, 56 insertions, 13 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 9f2ba27388b6..e7f338a3a3c2 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -835,6 +835,7 @@ config PATA_AT32
 config PATA_AT91
         tristate "PATA support for AT91SAM9260"
         depends on ARM && SOC_AT91SAM9
+        depends on !ARCH_MULTIPLATFORM
         help
           This option enables support for IDE devices on the Atmel AT91SAM9260 SoC.
 
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 49f1e6890587..33bb06e006c9 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -325,7 +325,6 @@ static const struct pci_device_id ahci_pci_tbl[] = {
         { PCI_VDEVICE(INTEL, 0x9d05), board_ahci }, /* Sunrise Point-LP RAID */
         { PCI_VDEVICE(INTEL, 0x9d07), board_ahci }, /* Sunrise Point-LP RAID */
         { PCI_VDEVICE(INTEL, 0xa103), board_ahci }, /* Sunrise Point-H AHCI */
-        { PCI_VDEVICE(INTEL, 0xa103), board_ahci }, /* Sunrise Point-H RAID */
         { PCI_VDEVICE(INTEL, 0xa105), board_ahci }, /* Sunrise Point-H RAID */
         { PCI_VDEVICE(INTEL, 0xa107), board_ahci }, /* Sunrise Point-H RAID */
         { PCI_VDEVICE(INTEL, 0xa10f), board_ahci }, /* Sunrise Point-H RAID */
diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
index e3b8750e8e9d..2e8bb603e447 100644
--- a/drivers/ata/ahci_xgene.c
+++ b/drivers/ata/ahci_xgene.c
@@ -213,7 +213,8 @@ static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc)
         }
 
         if (unlikely((ctx->last_cmd[ap->port_no] == ATA_CMD_ID_ATA) ||
-            (ctx->last_cmd[ap->port_no] == ATA_CMD_PACKET)))
+            (ctx->last_cmd[ap->port_no] == ATA_CMD_PACKET) ||
+            (ctx->last_cmd[ap->port_no] == ATA_CMD_SMART)))
                 xgene_ahci_restart_engine(ap);
 
         rc = ahci_qc_issue(qc);
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 97683e45ab04..61a9c07e0dff 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -2003,7 +2003,7 @@ static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
 
         devslp = readl(port_mmio + PORT_DEVSLP);
         if (!(devslp & PORT_DEVSLP_DSP)) {
-                dev_err(ap->host->dev, "port does not support device sleep\n");
+                dev_info(ap->host->dev, "port does not support device sleep\n");
                 return;
         }
 
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 7cbcafa30550..4b0d5e71858e 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4206,10 +4206,33 @@ 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, },
 
         /*
          * Some WD SATA-I drives spin up and down erratically when the link
@@ -4721,7 +4744,10 @@ static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
                 return NULL;
 
         for (i = 0, tag = ap->last_tag + 1; i < max_queue; i++, tag++) {
-                tag = tag < max_queue ? tag : 0;
+                if (ap->flags & ATA_FLAG_LOWTAG)
+                        tag = i;
+                else
+                        tag = tag < max_queue ? tag : 0;
 
                 /* the last tag is reserved for internal command. */
                 if (tag == ATA_TAG_INTERNAL)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 7659d6468303..280729325ebd 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2532,13 +2532,15 @@ 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/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index db90aa35cb71..2e86e3b85266 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -1333,7 +1333,19 @@ void ata_sff_flush_pio_task(struct ata_port *ap)
         DPRINTK("ENTER\n");
 
         cancel_delayed_work_sync(&ap->sff_pio_task);
+
+        /*
+         * We wanna reset the HSM state to IDLE.  If we do so without
+         * grabbing the port lock, critical sections protected by it which
+         * expect the HSM state to stay stable may get surprised.  For
+         * example, we may set IDLE in between the time
+         * __ata_sff_port_intr() checks for HSM_ST_IDLE and before it calls
+         * ata_sff_hsm_move() causing ata_sff_hsm_move() to BUG().
+         */
+        spin_lock_irq(ap->lock);
         ap->hsm_task_state = HSM_ST_IDLE;
+        spin_unlock_irq(ap->lock);
+
         ap->sff_pio_task_link = NULL;
 
         if (ata_msg_ctl(ap))
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index d81b20ddb527..ea655949023f 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -246,7 +246,7 @@ enum {
         /* host flags */
         SIL24_COMMON_FLAGS      = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA |
                                   ATA_FLAG_NCQ | ATA_FLAG_ACPI_SATA |
-                                  ATA_FLAG_AN | ATA_FLAG_PMP,
+                                  ATA_FLAG_AN | ATA_FLAG_PMP | ATA_FLAG_LOWTAG,
         SIL24_FLAG_PCIX_IRQ_WOC = (1 << 24), /* IRQ loss errata on PCI-X */
 
         IRQ_STAT_4PORTS         = 0xf,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 11beb4196c32..61df823ac86a 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -231,6 +231,7 @@ enum {
         ATA_FLAG_SW_ACTIVITY    = (1 << 22), /* driver supports sw activity
                                               * led */
         ATA_FLAG_NO_DIPM        = (1 << 23), /* host not happy with DIPM */
+        ATA_FLAG_LOWTAG         = (1 << 24), /* host wants lowest available tag */
 
         /* bits 24:31 of ap->flags are reserved for LLD specific flags */
 
@@ -422,6 +423,7 @@ 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 */