[libata] add DMA setup FIS auto-activate feature

Hopefully results in fewer on-the-wire FIS's and no breakage.  We'll see!

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

4 files changed, 36 insertions, 8 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index fe3eba5d6b3e..7a3124a9abc6 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -2869,7 +2869,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
         /* prepare host */
         if (hpriv->cap & HOST_CAP_NCQ)
-                pi.flags |= ATA_FLAG_NCQ;
+                pi.flags |= ATA_FLAG_NCQ | ATA_FLAG_FPDMA_AA;
 
         if (hpriv->cap & HOST_CAP_PMP)
                 pi.flags |= ATA_FLAG_PMP;
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 072ba5ea138f..98af50f16e0c 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2299,29 +2299,49 @@ static inline u8 ata_dev_knobble(struct ata_device *dev)
         return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
 }
 
-static void ata_dev_config_ncq(struct ata_device *dev,
+static int ata_dev_config_ncq(struct ata_device *dev,
                                char *desc, size_t desc_sz)
 {
         struct ata_port *ap = dev->link->ap;
         int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
+        unsigned int err_mask;
+        char *aa_desc = "";
 
         if (!ata_id_has_ncq(dev->id)) {
                 desc[0] = '\0';
-                return;
+                return 0;
         }
         if (dev->horkage & ATA_HORKAGE_NONCQ) {
                 snprintf(desc, desc_sz, "NCQ (not used)");
-                return;
+                return 0;
         }
         if (ap->flags & ATA_FLAG_NCQ) {
                 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
                 dev->flags |= ATA_DFLAG_NCQ;
         }
 
+        if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
+                (ap->flags & ATA_FLAG_FPDMA_AA) &&
+                ata_id_has_fpdma_aa(dev->id)) {
+                err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
+                        SATA_FPDMA_AA);
+                if (err_mask) {
+                        ata_dev_printk(dev, KERN_ERR, "failed to enable AA"
+                                "(error_mask=0x%x)\n", err_mask);
+                        if (err_mask != AC_ERR_DEV) {
+                                dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
+                                return -EIO;
+                        }
+                } else
+                        aa_desc = ", AA";
+        }
+
         if (hdepth >= ddepth)
-                snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
+                snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
         else
-                snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
+                snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
+                        ddepth, aa_desc);
+        return 0;
 }
 
 /**
@@ -2461,7 +2481,7 @@ int ata_dev_configure(struct ata_device *dev)
 
                 if (ata_id_has_lba(id)) {
                         const char *lba_desc;
-                        char ncq_desc[20];
+                        char ncq_desc[24];
 
                         lba_desc = "LBA";
                         dev->flags |= ATA_DFLAG_LBA;
@@ -2475,7 +2495,9 @@ int ata_dev_configure(struct ata_device *dev)
                         }
 
                         /* config NCQ */
-                        ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
+                        rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
+                        if (rc)
+                                return rc;
 
                         /* print device info to dmesg */
                         if (ata_msg_drv(ap) && print_info) {
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 9c75921f0c16..f5494050df83 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -306,6 +306,7 @@ enum {
         /* SETFEATURE Sector counts for SATA features */
         SATA_AN                 = 0x05,  /* Asynchronous Notification */
         SATA_DIPM               = 0x03,  /* Device Initiated Power Management */
+        SATA_FPDMA_AA           = 0x02,  /* DMA Setup FIS Auto-Activate */
 
         /* feature values for SET_MAX */
         ATA_SET_MAX_ADDR        = 0x00,
@@ -525,6 +526,9 @@ static inline int ata_is_data(u8 prot)
 #define ata_id_has_atapi_AN(id) \
         ( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
           ((id)[78] & (1 << 5)) )
+#define ata_id_has_fpdma_aa(id) \
+        ( (((id)[76] != 0x0000) && ((id)[76] != 0xffff)) && \
+          ((id)[78] & (1 << 2)) )
 #define ata_id_iordy_disable(id) ((id)[ATA_ID_CAPABILITY] & (1 << 10))
 #define ata_id_has_iordy(id) ((id)[ATA_ID_CAPABILITY] & (1 << 11))
 #define ata_id_u32(id,n)        \
diff --git a/include/linux/libata.h b/include/linux/libata.h
index e5b6e33c6571..d3f7cab4873e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -190,6 +190,7 @@ enum {
         ATA_FLAG_NO_POWEROFF_SPINDOWN = (1 << 11), /* don't spindown before poweroff */
         ATA_FLAG_NO_HIBERNATE_SPINDOWN = (1 << 12), /* don't spindown before hibernation */
         ATA_FLAG_DEBUGMSG       = (1 << 13),
+        ATA_FLAG_FPDMA_AA               = (1 << 14), /* driver supports Auto-Activate */
         ATA_FLAG_IGN_SIMPLEX    = (1 << 15), /* ignore SIMPLEX */
         ATA_FLAG_NO_IORDY       = (1 << 16), /* controller lacks iordy */
         ATA_FLAG_ACPI_SATA      = (1 << 17), /* need native SATA ACPI layout */
@@ -386,6 +387,7 @@ enum {
         ATA_HORKAGE_FIRMWARE_WARN = (1 << 12),  /* firmware update warning */
         ATA_HORKAGE_1_5_GBPS    = (1 << 13),    /* force 1.5 Gbps */
         ATA_HORKAGE_NOSETXFER   = (1 << 14),    /* skip SETXFER, SATA only */
+        ATA_HORKAGE_BROKEN_FPDMA_AA     = (1 << 15),    /* skip AA */
 
          /* DMA mask for user DMA control: User visible values; DO NOT
             renumber */