scsi: smartpqi: add module param for exposure order

Expose physical devices before logical devices.
Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Gilbert Wu <gilbert.wu@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/smartpqi/smartpqi_init.c

@@ -145,6 +145,12 @@ MODULE_PARM_DESC(lockup_action, "Action to take when controller locked up.\n"
 	"\t\tSupported: none, reboot, panic\n"
 	"\t\tDefault: none");
 
+static int pqi_expose_ld_first;
+module_param_named(expose_ld_first,
+	pqi_expose_ld_first, int, 0644);
+MODULE_PARM_DESC(expose_ld_first,
+	"Expose logical drives before physical drives.");
+
 static char *raid_levels[] = {
 	"RAID-0",
 	"RAID-4",
@@ -1988,6 +1994,8 @@ static int pqi_update_scsi_devices(struct pqi_ctrl_info *ctrl_info)
 	unsigned int num_valid_devices;
 	bool is_physical_device;
 	u8 *scsi3addr;
+	unsigned int physical_index;
+	unsigned int logical_index;
 	static char *out_of_memory_msg =
 		"failed to allocate memory, device discovery stopped";
 
@@ -2050,19 +2058,23 @@ static int pqi_update_scsi_devices(struct pqi_ctrl_info *ctrl_info)
 
 	device = NULL;
 	num_valid_devices = 0;
+	physical_index = 0;
+	logical_index = 0;
 
 	for (i = 0; i < num_new_devices; i++) {
 
-		if (i < num_physicals) {
+		if ((!pqi_expose_ld_first && i < num_physicals) ||
+			(pqi_expose_ld_first && i >= num_logicals)) {
 			is_physical_device = true;
-			phys_lun_ext_entry = &physdev_list->lun_entries[i];
+			phys_lun_ext_entry =
+				&physdev_list->lun_entries[physical_index++];
 			log_lun_ext_entry = NULL;
 			scsi3addr = phys_lun_ext_entry->lunid;
 		} else {
 			is_physical_device = false;
 			phys_lun_ext_entry = NULL;
 			log_lun_ext_entry =
-				&logdev_list->lun_entries[i - num_physicals];
+				&logdev_list->lun_entries[logical_index++];
 			scsi3addr = log_lun_ext_entry->lunid;
 		}