[PATCH] libata: add detailed AC_ERR_* flags

Add detailed AC_ERR_* flags and use them.  Long-term goal is to
describe all errors with err_mask and tf combination (tf for failed
sector information, etc...).  After proper error diagnosis is
implemented, sense data should also be generated from err_mask instead
of directly from hardware tf registers as it is currently.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

5 files changed, 19 insertions, 14 deletions

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index a168b525d079..bb3686ae1885 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -680,7 +680,7 @@ static void ahci_eng_timeout(struct ata_port *ap)
                  * not being called from the SCSI EH.
                  */
                 qc->scsidone = scsi_finish_command;
-                qc->err_mask |= AC_ERR_OTHER;
+                qc->err_mask |= AC_ERR_TIMEOUT;
                 ata_qc_complete(qc);
         }
 
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 43a23286d6fe..f5519f01491c 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1142,7 +1142,7 @@ ata_exec_internal(struct ata_port *ap, struct ata_device *dev,
                  * spurious interrupt.  We can live with that.
                  */
                 if (qc->flags & ATA_QCFLAG_ACTIVE) {
-                        qc->err_mask = AC_ERR_OTHER;
+                        qc->err_mask = AC_ERR_TIMEOUT;
                         ata_qc_complete(qc);
                         printk(KERN_WARNING "ata%u: qc timeout (cmd 0x%x)\n",
                                ap->id, command);
@@ -2917,7 +2917,7 @@ static unsigned long ata_pio_poll(struct ata_port *ap)
         status = ata_chk_status(ap);
         if (status & ATA_BUSY) {
                 if (time_after(jiffies, ap->pio_task_timeout)) {
-                        qc->err_mask |= AC_ERR_ATA_BUS;
+                        qc->err_mask |= AC_ERR_TIMEOUT;
                         ap->hsm_task_state = HSM_ST_TMOUT;
                         return 0;
                 }
@@ -3295,7 +3295,7 @@ static void atapi_pio_bytes(struct ata_queued_cmd *qc)
 err_out:
         printk(KERN_INFO "ata%u: dev %u: ATAPI check failed\n",
               ap->id, dev->devno);
-        qc->err_mask |= AC_ERR_ATA_BUS;
+        qc->err_mask |= AC_ERR_HSM;
         ap->hsm_task_state = HSM_ST_ERR;
 }
 
@@ -3353,7 +3353,7 @@ static void ata_pio_block(struct ata_port *ap)
         } else {
                 /* handle BSY=0, DRQ=0 as error */
                 if ((status & ATA_DRQ) == 0) {
-                        qc->err_mask |= AC_ERR_ATA_BUS;
+                        qc->err_mask |= AC_ERR_HSM;
                         ap->hsm_task_state = HSM_ST_ERR;
                         return;
                 }
@@ -4159,14 +4159,14 @@ static void atapi_packet_task(void *_data)
         /* sleep-wait for BSY to clear */
         DPRINTK("busy wait\n");
         if (ata_busy_sleep(ap, ATA_TMOUT_CDB_QUICK, ATA_TMOUT_CDB)) {
-                qc->err_mask |= AC_ERR_ATA_BUS;
+                qc->err_mask |= AC_ERR_TIMEOUT;
                 goto err_out;
         }
 
         /* make sure DRQ is set */
         status = ata_chk_status(ap);
         if ((status & (ATA_BUSY | ATA_DRQ)) != ATA_DRQ) {
-                qc->err_mask |= AC_ERR_ATA_BUS;
+                qc->err_mask |= AC_ERR_HSM;
                 goto err_out;
         }
 
diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index cd54244058b5..89bcd85fa58c 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -1866,7 +1866,7 @@ static void mv_eng_timeout(struct ata_port *ap)
                  */
                 spin_lock_irqsave(&ap->host_set->lock, flags);
                 qc->scsidone = scsi_finish_command;
-                qc->err_mask |= AC_ERR_OTHER;
+                qc->err_mask |= AC_ERR_TIMEOUT;
                 ata_qc_complete(qc);
                 spin_unlock_irqrestore(&ap->host_set->lock, flags);
         }
diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
index 923130185a9e..fb59012b9fbe 100644
--- a/drivers/scsi/sata_sil24.c
+++ b/drivers/scsi/sata_sil24.c
@@ -653,7 +653,7 @@ static void sil24_eng_timeout(struct ata_port *ap)
          */
         printk(KERN_ERR "ata%u: command timeout\n", ap->id);
         qc->scsidone = scsi_finish_command;
-        qc->err_mask |= AC_ERR_OTHER;
+        qc->err_mask |= AC_ERR_TIMEOUT;
         ata_qc_complete(qc);
 
         sil24_reset_controller(ap);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index d58b659cf3f5..8ff3a7f6f63c 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -222,10 +222,15 @@ enum hsm_task_states {
 };
 
 enum ata_completion_errors {
-        AC_ERR_OTHER            = (1 << 0),
-        AC_ERR_DEV              = (1 << 1),
-        AC_ERR_ATA_BUS          = (1 << 2),
-        AC_ERR_HOST_BUS         = (1 << 3),
+        AC_ERR_DEV              = (1 << 0), /* device reported error */
+        AC_ERR_HSM              = (1 << 1), /* host state machine violation */
+        AC_ERR_TIMEOUT          = (1 << 2), /* timeout */
+        AC_ERR_MEDIA            = (1 << 3), /* media error */
+        AC_ERR_ATA_BUS          = (1 << 4), /* ATA bus error */
+        AC_ERR_HOST_BUS         = (1 << 5), /* host bus error */
+        AC_ERR_SYSTEM           = (1 << 6), /* system error */
+        AC_ERR_INVALID          = (1 << 7), /* invalid argument */
+        AC_ERR_OTHER            = (1 << 8), /* unknown */
 };
 
 /* forward declarations */
@@ -833,7 +838,7 @@ static inline int ata_try_flush_cache(const struct ata_device *dev)
 static inline unsigned int ac_err_mask(u8 status)
 {
         if (status & ATA_BUSY)
-                return AC_ERR_ATA_BUS;
+                return AC_ERR_HSM;
         if (status & (ATA_ERR | ATA_DF))
                 return AC_ERR_DEV;
         return 0;