scsi: smartpqi: Add driver support for multi-LUN devices

Add driver support for up to 256 LUNs per device.

Update AIO path to pass the appropriate LUN number for base-code to target
the correct LUN.

Update RAID IO path to pass the appropriate LUN number for FW to target the
correct LUN.

Pass the correct LUN number while doing a LUN reset.

Count the outstanding commands based on LUN number.  While removing a
Multi-LUN device, wait for all outstanding commands to complete for all
LUNs.

Add Feature bit support.

Link: https://lore.kernel.org/r/165730603067.177165.14016422176841798336.stgit@brunhildaReviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Kumar Meiyappan <Kumar.Meiyappan@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/smartpqi/smartpqi.h

@@ -293,7 +293,8 @@ struct pqi_raid_path_request {
 	u8	additional_cdb_bytes_usage : 3;
 	u8	reserved5 : 3;
 	u8	cdb[16];
-	u8	reserved6[12];
+	u8	reserved6[11];
+	u8	ml_device_lun_number;
 	__le32	timeout;
 	struct pqi_sg_descriptor sg_descriptors[PQI_MAX_EMBEDDED_SG_DESCRIPTORS];
 };
@@ -467,7 +468,8 @@ struct pqi_task_management_request {
 	struct pqi_iu_header header;
 	__le16	request_id;
 	__le16	nexus_id;
-	u8	reserved[2];
+	u8	reserved;
+	u8	ml_device_lun_number;
 	__le16  timeout;
 	u8	lun_number[8];
 	__le16	protocol_specific;
@@ -864,7 +866,8 @@ struct pqi_config_table_firmware_features {
 #define PQI_FIRMWARE_FEATURE_UNIQUE_WWID_IN_REPORT_PHYS_LUN	16
 #define PQI_FIRMWARE_FEATURE_FW_TRIAGE				17
 #define PQI_FIRMWARE_FEATURE_RPL_EXTENDED_FORMAT_4_5		18
-#define PQI_FIRMWARE_FEATURE_MAXIMUM				18
+#define PQI_FIRMWARE_FEATURE_MULTI_LUN_DEVICE_SUPPORT           21
+#define PQI_FIRMWARE_FEATURE_MAXIMUM                            21
 
 struct pqi_config_table_debug {
 	struct pqi_config_table_section_header header;
@@ -1082,6 +1085,8 @@ struct pqi_stream_data {
 	u32	last_accessed;
 };
 
+#define PQI_MAX_LUNS_PER_DEVICE         256
+
 struct pqi_scsi_dev {
 	int	devtype;		/* as reported by INQUIRY command */
 	u8	device_type;		/* as reported by */
@@ -1125,6 +1130,7 @@ struct pqi_scsi_dev {
 	u8	phy_id;
 	u8	ncq_prio_enable;
 	u8	ncq_prio_support;
+	u8	multi_lun_device_lun_count;
 	bool	raid_bypass_configured;	/* RAID bypass configured */
 	bool	raid_bypass_enabled;	/* RAID bypass enabled */
 	u32	next_bypass_group[RAID_MAP_MAX_DATA_DISKS_PER_ROW];
@@ -1140,7 +1146,7 @@ struct pqi_scsi_dev {
 	struct list_head delete_list_entry;
 
 	struct pqi_stream_data stream_data[NUM_STREAMS_PER_LUN];
-	atomic_t scsi_cmds_outstanding;
+	atomic_t scsi_cmds_outstanding[PQI_MAX_LUNS_PER_DEVICE];
 	atomic_t raid_bypass_cnt;
 };
 
@@ -1333,6 +1339,7 @@ struct pqi_ctrl_info {
 	u8		tmf_iu_timeout_supported : 1;
 	u8		firmware_triage_supported : 1;
 	u8		rpl_extended_format_4_5_supported : 1;
+	u8		multi_lun_device_supported : 1;
 	u8		enable_r1_writes : 1;
 	u8		enable_r5_writes : 1;
 	u8		enable_r6_writes : 1;