scsi: megaraid_sas: RAID1 PCI bandwidth limit algorithm is applicable for only Ventura

RAID1 PCI bandwidth limit algorithm is not applicable to Aero as it's PCIe
Gen4 adapter.

Signed-off-by: Sumit Saxena <[email protected]>
Signed-off-by: Chandrakanth Patil <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: cp890582

drivers/scsi/megaraid/megaraid_sas_base.c

@@ -5777,6 +5777,9 @@ static int megasas_init_fw(struct megasas_instance *instance)
 			MR_MAX_RAID_MAP_SIZE_MASK);
 	}
 
+	if (instance->adapter_type == VENTURA_SERIES)
+		fusion->pcie_bw_limitation = true;
+
 	/* Check if MSI-X is supported while in ready state */
 	msix_enable = (instance->instancet->read_fw_status_reg(instance) &
 		       0x4000000) >> 0x1a;

drivers/scsi/megaraid/megaraid_sas_fusion.c

@@ -2621,9 +2621,10 @@ static void megasas_stream_detect(struct megasas_instance *instance,
  *
  */
 static void
-megasas_set_raidflag_cpu_affinity(union RAID_CONTEXT_UNION *praid_context,
-				  struct MR_LD_RAID *raid, bool fp_possible,
-				  u8 is_read, u32 scsi_buff_len)
+megasas_set_raidflag_cpu_affinity(struct fusion_context *fusion,
+				union RAID_CONTEXT_UNION *praid_context,
+				struct MR_LD_RAID *raid, bool fp_possible,
+				u8 is_read, u32 scsi_buff_len)
 {
 	u8 cpu_sel = MR_RAID_CTX_CPUSEL_0;
 	struct RAID_CONTEXT_G35 *rctx_g35;
@@ -2681,11 +2682,11 @@ megasas_set_raidflag_cpu_affinity(union RAID_CONTEXT_UNION *praid_context,
 	 * vs MR_RAID_FLAGS_IO_SUB_TYPE_CACHE_BYPASS.
 	 * IO Subtype is not bitmap.
 	 */
-	if ((raid->level == 1) && (!is_read)) {
-		if (scsi_buff_len > MR_LARGE_IO_MIN_SIZE)
-			praid_context->raid_context_g35.raid_flags =
-				(MR_RAID_FLAGS_IO_SUB_TYPE_LDIO_BW_LIMIT
-				<< MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT);
+	if ((fusion->pcie_bw_limitation) && (raid->level == 1) && (!is_read) &&
+			(scsi_buff_len > MR_LARGE_IO_MIN_SIZE)) {
+		praid_context->raid_context_g35.raid_flags =
+			(MR_RAID_FLAGS_IO_SUB_TYPE_LDIO_BW_LIMIT
+			<< MR_RAID_CTX_RAID_FLAGS_IO_SUB_TYPE_SHIFT);
 	}
 }
 
@@ -2834,8 +2835,9 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
 				(instance->host->can_queue)) {
 				fp_possible = false;
 				atomic_dec(&instance->fw_outstanding);
-			} else if ((scsi_buff_len > MR_LARGE_IO_MIN_SIZE) ||
-				   (atomic_dec_if_positive(&mrdev_priv->r1_ldio_hint) > 0)) {
+			} else if (fusion->pcie_bw_limitation &&
+				((scsi_buff_len > MR_LARGE_IO_MIN_SIZE) ||
+				   (atomic_dec_if_positive(&mrdev_priv->r1_ldio_hint) > 0))) {
 				fp_possible = false;
 				atomic_dec(&instance->fw_outstanding);
 				if (scsi_buff_len > MR_LARGE_IO_MIN_SIZE)
@@ -2860,7 +2862,7 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
 
 		/* If raid is NULL, set CPU affinity to default CPU0 */
 		if (raid)
-			megasas_set_raidflag_cpu_affinity(&io_request->RaidContext,
+			megasas_set_raidflag_cpu_affinity(fusion, &io_request->RaidContext,
 				raid, fp_possible, io_info.isRead,
 				scsi_buff_len);
 		else

drivers/scsi/megaraid/megaraid_sas_fusion.h

@@ -1335,7 +1335,7 @@ struct fusion_context {
 	dma_addr_t ioc_init_request_phys;
 	struct MPI2_IOC_INIT_REQUEST *ioc_init_request;
 	struct megasas_cmd *ioc_init_cmd;
-
+	bool pcie_bw_limitation;
 };
 
 union desc_value {