The purpose of the counters is to enable all ULDs attached to a
device to find out that a New Media or/and Power On/Reset Unit
Attentions has/have been set, even if another ULD catches the
Unit Attention as response to a SCSI command.
The ULDs can read the counters using the scsi_get_ua_new_media_ctr()
and scsi_get_ua_por_ctr() macros (argument pointer to the scsi_device
struct).
Signed-off-by: Kai Mäkisara <Kai.Makisara@xxxxxxxxxxx>
---
drivers/scsi/scsi_error.c | 12 ++++++++++++
include/scsi/scsi_device.h | 9 +++++++++
2 files changed, 21 insertions(+)
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 10154d78e336..6ef0711c4ec3 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -547,6 +547,18 @@ enum scsi_disposition scsi_check_sense(struct scsi_cmnd *scmd)
scsi_report_sense(sdev, &sshdr);
+ if (sshdr.sense_key == UNIT_ATTENTION) {
+ /*
+ * increment the counters for Power on/Reset or New Media so
+ * that all ULDs interested in these can see that those have
+ * happened, even if someone else gets the sense data.
+ */
+ if (sshdr.asc == 0x28)
+ scmd->device->ua_new_media_ctr++;
+ else if (sshdr.asc == 0x29)
+ scmd->device->ua_por_ctr++;
+ }
+
if (scsi_sense_is_deferred(&sshdr))
return NEEDS_RETRY;
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 9c540f5468eb..b184a5efc27e 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -247,6 +247,9 @@ struct scsi_device {
unsigned int queue_stopped; /* request queue is quiesced */
bool offline_already; /* Device offline message logged */
+ unsigned char ua_new_media_ctr; /* Counter for New Media UNIT ATTENTIONs */
+ unsigned char ua_por_ctr; /* Counter for Power On / Reset UAs */
+
atomic_t disk_events_disable_depth; /* disable depth for disk events */
DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
@@ -684,6 +687,12 @@ static inline int scsi_device_busy(struct scsi_device *sdev)
return sbitmap_weight(&sdev->budget_map);
}
+/* Macros to access the UNIT ATTENTION counters */
+#define scsi_get_ua_new_media_ctr(sdev) \
+ ((const unsigned int)(sdev->ua_new_media_ctr))
+#define scsi_get_ua_por_ctr(sdev) \
+ ((const unsigned int)(sdev->ua_por_ctr))
+
#define MODULE_ALIAS_SCSI_DEVICE(type) \
MODULE_ALIAS("scsi:t-" __stringify(type) "*")
#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
--
2.43.0
