[SCSI] mpt2sas: Tie a log info message to a specific PHY.

Add support to display additional debug info for SCSI_IO and
RAID_SCSI_IO_PASSTHROUGH sent from the normal entry queued entry
point, as well as internal generated commands, and IOCTLS.  The
additional debug info included the phy number, as well as the
sas address, enclosure logical id, and slot number.  This debug info
has to be enabled thru the logging_level command line option, by
default this will not be displayed.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
index 55fbd5b69b8..ce63a4a6670 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -80,6 +80,32 @@ enum block_state {
         BLOCKING,
 };
 
+/**
+ * _ctl_sas_device_find_by_handle - sas device search
+ * @ioc: per adapter object
+ * @handle: sas device handle (assigned by firmware)
+ * Context: Calling function should acquire ioc->sas_device_lock
+ *
+ * This searches for sas_device based on sas_address, then return sas_device
+ * object.
+ */
+static struct _sas_device *
+_ctl_sas_device_find_by_handle(struct MPT2SAS_ADAPTER *ioc, u16 handle)
+{
+        struct _sas_device *sas_device, *r;
+
+        r = NULL;
+        list_for_each_entry(sas_device, &ioc->sas_device_list, list) {
+                if (sas_device->handle != handle)
+                        continue;
+                r = sas_device;
+                goto out;
+        }
+
+ out:
+        return r;
+}
+
 #ifdef CONFIG_SCSI_MPT2SAS_LOGGING
 /**
  * _ctl_display_some_debug - debug routine
@@ -205,6 +231,22 @@ _ctl_display_some_debug(struct MPT2SAS_ADAPTER *ioc, u16 smid,
             MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH) {
                 Mpi2SCSIIOReply_t *scsi_reply =
                     (Mpi2SCSIIOReply_t *)mpi_reply;
+                struct _sas_device *sas_device = NULL;
+                unsigned long flags;
+
+                spin_lock_irqsave(&ioc->sas_device_lock, flags);
+                sas_device = _ctl_sas_device_find_by_handle(ioc,
+                    le16_to_cpu(scsi_reply->DevHandle));
+                if (sas_device) {
+                        printk(MPT2SAS_WARN_FMT "\tsas_address(0x%016llx), "
+                            "phy(%d)\n", ioc->name, (unsigned long long)
+                            sas_device->sas_address, sas_device->phy);
+                        printk(MPT2SAS_WARN_FMT
+                            "\tenclosure_logical_id(0x%016llx), slot(%d)\n",
+                            ioc->name, sas_device->enclosure_logical_id,
+                            sas_device->slot);
+                }
+                spin_unlock_irqrestore(&ioc->sas_device_lock, flags);
                 if (scsi_reply->SCSIState || scsi_reply->SCSIStatus)
                         printk(MPT2SAS_INFO_FMT
                             "\tscsi_state(0x%02x), scsi_status"