megaraid_sas: Make tape drives visible on PERC5 controllers

The DELL PERC5 controller firmware does not list tape drives in response
to MR_DCMD_PD_LIST_QUERY. This causes tape drives not be exposed to the
OS when connected to a PERC5 controller.

This patch permits detection of tape drives connected to a PERC5
controller by exposing non-TYPE_DISK devices unconditionally.

Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 97b0c8f..c0f7c8c 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1790,6 +1790,7 @@ struct megasas_instance {
        u8 UnevenSpanSupport;
 
        u8 supportmax256vd;
+       u8 allow_fw_scan;
        u16 fw_supported_vd_count;
        u16 fw_supported_pd_count;
 

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index cc95372..6efab72 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -1760,6 +1760,20 @@ static void megasas_set_dma_alignment(struct scsi_device *sdev)
 
 static int megasas_slave_configure(struct scsi_device *sdev)
 {
+       u16 pd_index = 0;
+       struct megasas_instance *instance;
+
+       instance = megasas_lookup_instance(sdev->host->host_no);
+       if (instance->allow_fw_scan) {
+               if (sdev->channel < MEGASAS_MAX_PD_CHANNELS &&
+                       sdev->type == TYPE_DISK) {
+                       pd_index = (sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) +
+                               sdev->id;
+                       if (instance->pd_list[pd_index].driveState !=
+                               MR_PD_STATE_SYSTEM)
+                               return -ENXIO;
+               }
+       }
        megasas_set_dma_alignment(sdev);
        /*
         * The RAID firmware may require extended timeouts.
@@ -1783,9 +1797,8 @@ static int megasas_slave_alloc(struct scsi_device *sdev)
                pd_index =
                        (sdev->channel * MEGASAS_MAX_DEV_PER_CHANNEL) +
                        sdev->id;
-               if ((instance->pd_list[pd_index].driveState ==
-                       MR_PD_STATE_SYSTEM) ||
-                       (instance->pd_list[pd_index].driveType != TYPE_DISK)) {
+               if ((instance->allow_fw_scan || instance->pd_list[pd_index].driveState ==
+                       MR_PD_STATE_SYSTEM)) {
                        return 0;
                }
                return -ENXIO;
@@ -4699,6 +4712,7 @@ static int megasas_init_fw(struct megasas_instance *instance)
        case PCI_DEVICE_ID_DELL_PERC5:
        default:
                instance->instancet = &megasas_instance_template_xscale;
+               instance->allow_fw_scan = 1;
                break;
        }