[SCSI] hpsa add sysfs debug switch for raid map debugging messages

Signed-off-by: Scott Teel <scott.teel@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index e36e3102c45c..09119c299794 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -312,6 +312,31 @@ static ssize_t host_store_hp_ssd_smart_path_status(struct device *dev,
         return count;
 }
 
+static ssize_t host_store_raid_offload_debug(struct device *dev,
+                                         struct device_attribute *attr,
+                                         const char *buf, size_t count)
+{
+        int debug_level, len;
+        struct ctlr_info *h;
+        struct Scsi_Host *shost = class_to_shost(dev);
+        char tmpbuf[10];
+
+        if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+                return -EACCES;
+        len = count > sizeof(tmpbuf) - 1 ? sizeof(tmpbuf) - 1 : count;
+        strncpy(tmpbuf, buf, len);
+        tmpbuf[len] = '\0';
+        if (sscanf(tmpbuf, "%d", &debug_level) != 1)
+                return -EINVAL;
+        if (debug_level < 0)
+                debug_level = 0;
+        h = shost_to_hba(shost);
+        h->raid_offload_debug = debug_level;
+        dev_warn(&h->pdev->dev, "hpsa: Set raid_offload_debug level = %d\n",
+                h->raid_offload_debug);
+        return count;
+}
+
 static ssize_t host_store_rescan(struct device *dev,
                                  struct device_attribute *attr,
                                  const char *buf, size_t count)
@@ -585,6 +610,8 @@ static DEVICE_ATTR(hp_ssd_smart_path_enabled, S_IRUGO,
 static DEVICE_ATTR(hp_ssd_smart_path_status, S_IWUSR|S_IRUGO|S_IROTH,
                 host_show_hp_ssd_smart_path_status,
                 host_store_hp_ssd_smart_path_status);
+static DEVICE_ATTR(raid_offload_debug, S_IWUSR, NULL,
+                        host_store_raid_offload_debug);
 static DEVICE_ATTR(firmware_revision, S_IRUGO,
         host_show_firmware_revision, NULL);
 static DEVICE_ATTR(commands_outstanding, S_IRUGO,
@@ -609,6 +636,7 @@ static struct device_attribute *hpsa_shost_attrs[] = {
         &dev_attr_transport_mode,
         &dev_attr_resettable,
         &dev_attr_hp_ssd_smart_path_status,
+        &dev_attr_raid_offload_debug,
         NULL,
 };
 
@@ -2020,6 +2048,10 @@ static void hpsa_debug_map_buff(struct ctlr_info *h, int rc,
         if (rc != 0)
                 return;
 
+        /* Show details only if debugging has been activated. */
+        if (h->raid_offload_debug < 2)
+                return;
+
         dev_info(&h->pdev->dev, "structure_size = %u\n",
                                 le32_to_cpu(map_buff->structure_size));
         dev_info(&h->pdev->dev, "volume_blk_size = %u\n",
@@ -2505,6 +2537,17 @@ static int hpsa_get_pdisk_of_ioaccel2(struct ctlr_info *h,
         scsi_nexus = cpu_to_le32((u32) c2a->scsi_nexus);
         find = c2a->scsi_nexus;
 
+        if (h->raid_offload_debug > 0)
+                dev_info(&h->pdev->dev,
+                        "%s: scsi_nexus:0x%08x device id: 0x%02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x %02x%02x%02x%02x\n",
+                        __func__, scsi_nexus,
+                        d->device_id[0], d->device_id[1], d->device_id[2],
+                        d->device_id[3], d->device_id[4], d->device_id[5],
+                        d->device_id[6], d->device_id[7], d->device_id[8],
+                        d->device_id[9], d->device_id[10], d->device_id[11],
+                        d->device_id[12], d->device_id[13], d->device_id[14],
+                        d->device_id[15]);
+
         /* Get the list of physical devices */
         physicals = kzalloc(reportsize, GFP_KERNEL);
         if (hpsa_scsi_do_report_phys_luns(h, (struct ReportLUNdata *) physicals,
@@ -2529,6 +2572,15 @@ static int hpsa_get_pdisk_of_ioaccel2(struct ctlr_info *h,
                 found = 1;
                 memcpy(scsi3addr, &((struct ReportExtendedLUNdata *)
                                         physicals)->LUN[i][0], 8);
+                if (h->raid_offload_debug > 0)
+                        dev_info(&h->pdev->dev,
+                                "%s: Searched h=0x%08x, Found h=0x%08x, scsiaddr 0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
+                                __func__, find,
+                                ((struct ReportExtendedLUNdata *)
+                                        physicals)->LUN[i][20],
+                                scsi3addr[0], scsi3addr[1], scsi3addr[2],
+                                scsi3addr[3], scsi3addr[4], scsi3addr[5],
+                                scsi3addr[6], scsi3addr[7]);
                 break; /* found it */
         }
 
@@ -4077,6 +4129,13 @@ static int hpsa_send_reset_as_abort_ioaccel2(struct ctlr_info *h,
                         return -1; /* not abortable */
         }
 
+        if (h->raid_offload_debug > 0)
+                dev_info(&h->pdev->dev,
+                        "Reset as abort: Abort requested on C%d:B%d:T%d:L%d scsi3addr 0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
+                        h->scsi_host->host_no, dev->bus, dev->target, dev->lun,
+                        scsi3addr[0], scsi3addr[1], scsi3addr[2], scsi3addr[3],
+                        scsi3addr[4], scsi3addr[5], scsi3addr[6], scsi3addr[7]);
+
         if (!dev->offload_enabled) {
                 dev_warn(&h->pdev->dev,
                         "Can't abort: device is not operating in HP SSD Smart Path mode.\n");
@@ -4090,6 +4149,11 @@ static int hpsa_send_reset_as_abort_ioaccel2(struct ctlr_info *h,
         }
 
         /* send the reset */
+        if (h->raid_offload_debug > 0)
+                dev_info(&h->pdev->dev,
+                        "Reset as abort: Resetting physical device at scsi3addr 0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
+                        psa[0], psa[1], psa[2], psa[3],
+                        psa[4], psa[5], psa[6], psa[7]);
         rc = hpsa_send_reset(h, psa, HPSA_RESET_TYPE_TARGET);
         if (rc != 0) {
                 dev_warn(&h->pdev->dev,