libata: detect Device Attention support

Add a new flag ATA_DFLAG_DA to indicate that device supports "Device
Attention".

Acked-by: Aaron Lu <aaron.lu@amd.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

3 files changed, 6 insertions, 0 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 7705191b5a81..c14f88c1f1da 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2374,6 +2374,9 @@ int ata_dev_configure(struct ata_device *dev)
                         dma_dir_string = ", DMADIR";
                 }
 
+                if (ata_id_has_da(dev->id))
+                        dev->flags |= ATA_DFLAG_DA;
+
                 /* print device info to dmesg */
                 if (ata_msg_drv(ap) && print_info)
                         ata_dev_info(dev,
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 32df2b6ef0e0..5713d3ac381a 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -578,6 +578,7 @@ static inline int ata_is_data(u8 prot)
           ((u64) (id)[(n) + 0]) )
 
 #define ata_id_cdb_intr(id)     (((id)[ATA_ID_CONFIG] & 0x60) == 0x20)
+#define ata_id_has_da(id)       ((id)[77] & (1 << 4))
 
 static inline bool ata_id_has_hipm(const u16 *id)
 {
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 888feef3cda4..cc22b943db83 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -161,6 +161,8 @@ enum {
         ATA_DFLAG_DETACH        = (1 << 24),
         ATA_DFLAG_DETACHED      = (1 << 25),
 
+        ATA_DFLAG_DA            = (1 << 26), /* device supports Device Attention */
+
         ATA_DEV_UNKNOWN         = 0,    /* unknown device */
         ATA_DEV_ATA             = 1,    /* ATA device */
         ATA_DEV_ATA_UNSUP       = 2,    /* ATA device (unsupported) */