Implement two utility functions ata_err_string() and
atapi_eh_request_sense(). They will be used by EH.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/scsi/libata-eh.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 92 insertions(+), 0 deletions(-)
75a537b896e2e5c014503d310769ae6abb5d57d8
diff --git a/drivers/scsi/libata-eh.c b/drivers/scsi/libata-eh.c
index 485ebaa..7ef2b78 100644
--- a/drivers/scsi/libata-eh.c
+++ b/drivers/scsi/libata-eh.c
@@ -466,3 +466,95 @@ void ata_eh_qc_retry(struct ata_queued_c
scmd->retries--;
__ata_eh_qc_complete(qc);
}
+
+/**
+ * ata_err_string - convert err_mask to descriptive string
+ * @err_mask: error mask to convert to string
+ *
+ * Convert @err_mask to descriptive string. Errors are
+ * prioritized according to severity and only the most severe
+ * error is reported.
+ *
+ * LOCKING:
+ * None.
+ *
+ * RETURNS:
+ * Descriptive string for @err_mask
+ */
+static const char * ata_err_string(unsigned int err_mask)
+{
+ if (err_mask & AC_ERR_HOST_BUS)
+ return "host bus error";
+ if (err_mask & AC_ERR_ATA_BUS)
+ return "ATA bus error";
+ if (err_mask & AC_ERR_TIMEOUT)
+ return "timeout";
+ if (err_mask & AC_ERR_HSM)
+ return "host state machine violation";
+ if (err_mask & AC_ERR_SYSTEM)
+ return "host internal error";
+ if (err_mask & AC_ERR_MEDIA)
+ return "media error";
+ if (err_mask & AC_ERR_INVALID)
+ return "invalid argument error";
+ if (err_mask & AC_ERR_DEV)
+ return "unclassified device error";
+ return "unknown error";
+}
+
+/**
+ * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
+ * @ap: port associated with device @dev
+ * @dev: device to perform REQUEST_SENSE to
+ * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
+ *
+ * Perform ATAPI REQUEST_SENSE after the device reported CHECK
+ * SENSE. This function is EH helper.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep)
+ *
+ * RETURNS:
+ * 0 on success, AC_ERR_* mask on failure
+ */
+static unsigned int atapi_eh_request_sense(struct ata_port *ap,
+ struct ata_device *dev,
+ unsigned char *sense_buf)
+{
+ struct ata_taskfile tf;
+ u8 cdb[ATAPI_CDB_LEN];
+
+ DPRINTK("ATAPI request sense\n");
+
+ ata_tf_init(ap, &tf, dev->devno);
+
+ /* FIXME: is this needed? */
+ memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
+
+ /* XXX: why tf_read here? */
+ ap->ops->tf_read(ap, &tf);
+
+ /* fill these in, for the case where they are -not- overwritten */
+ sense_buf[0] = 0x70;
+ sense_buf[2] = tf.feature >> 4;
+
+ memset(cdb, 0, ATAPI_CDB_LEN);
+ cdb[0] = REQUEST_SENSE;
+ cdb[4] = SCSI_SENSE_BUFFERSIZE;
+
+ tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf.command = ATA_CMD_PACKET;
+
+ /* is it pointless to prefer PIO for "safety reasons"? */
+ if (ap->flags & ATA_FLAG_PIO_DMA) {
+ tf.protocol = ATA_PROT_ATAPI_DMA;
+ tf.feature |= ATAPI_PKT_DMA;
+ } else {
+ tf.protocol = ATA_PROT_ATAPI;
+ tf.lbam = (8 * 1024) & 0xff;
+ tf.lbah = (8 * 1024) >> 8;
+ }
+
+ return ata_exec_internal(ap, dev, &tf, cdb, DMA_FROM_DEVICE,
+ sense_buf, SCSI_SENSE_BUFFERSIZE);
+}
--
1.2.4
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