scsi: megaraid_sas: Enable or Disable Fast path based on the PCI Threshold Bandwidth

Large SEQ IO workload should sent as non fast path commands

Signed-off-by: Sasikumar Chandrasekaran <sasikumar.pc@broadcom.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 19bc3501f28f..eba107898c7f 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -1940,6 +1940,9 @@ void megaraid_sas_kill_hba(struct megasas_instance *instance)
 	}
 	/* Complete outstanding ioctls when adapter is killed */
 	megasas_complete_outstanding_ioctls(instance);
+	if (instance->is_ventura)
+		del_timer_sync(&instance->r1_fp_hold_timer);
+
 }
 
  /**
@@ -2438,6 +2441,24 @@ void megasas_sriov_heartbeat_handler(unsigned long instance_addr)
 	}
 }
 
+/*Handler for disabling/enabling raid 1 fast paths*/
+void megasas_change_r1_fp_status(unsigned long instance_addr)
+{
+	struct megasas_instance *instance =
+			(struct megasas_instance *)instance_addr;
+	if (atomic64_read(&instance->bytes_wrote) >=
+					instance->pci_threshold_bandwidth) {
+
+		atomic64_set(&instance->bytes_wrote, 0);
+		atomic_set(&instance->r1_write_fp_capable, 0);
+	} else {
+		atomic64_set(&instance->bytes_wrote, 0);
+		atomic_set(&instance->r1_write_fp_capable, 1);
+	}
+	mod_timer(&instance->r1_fp_hold_timer,
+	 jiffies + MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL);
+}
+
 /**
  * megasas_wait_for_outstanding -	Wait for all outstanding cmds
  * @instance:				Adapter soft state
@@ -5362,6 +5383,17 @@ static int megasas_init_fw(struct megasas_instance *instance)
 			instance->skip_heartbeat_timer_del = 1;
 	}
 
+	if (instance->is_ventura) {
+		atomic64_set(&instance->bytes_wrote, 0);
+		atomic_set(&instance->r1_write_fp_capable, 1);
+		megasas_start_timer(instance,
+			    &instance->r1_fp_hold_timer,
+			    megasas_change_r1_fp_status,
+			    MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL);
+				dev_info(&instance->pdev->dev, "starting the raid 1 fp timer with interval %d\n",
+				MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL);
+	}
+
 	return 0;
 
 fail_get_ld_pd_list:
@@ -6152,6 +6184,9 @@ megasas_suspend(struct pci_dev *pdev, pm_message_t state)
 	if (instance->requestorId && !instance->skip_heartbeat_timer_del)
 		del_timer_sync(&instance->sriov_heartbeat_timer);
 
+	if (instance->is_ventura)
+		del_timer_sync(&instance->r1_fp_hold_timer);
+
 	megasas_flush_cache(instance);
 	megasas_shutdown_controller(instance, MR_DCMD_HIBERNATE_SHUTDOWN);
 
@@ -6278,6 +6313,16 @@ megasas_resume(struct pci_dev *pdev)
 	megasas_setup_jbod_map(instance);
 	instance->unload = 0;
 
+	if (instance->is_ventura) {
+		atomic64_set(&instance->bytes_wrote, 0);
+		atomic_set(&instance->r1_write_fp_capable, 1);
+		megasas_start_timer(instance,
+			    &instance->r1_fp_hold_timer,
+			    megasas_change_r1_fp_status,
+			    MEGASAS_RAID1_FAST_PATH_STATUS_CHECK_INTERVAL);
+	}
+
+
 	/*
 	 * Initiate AEN (Asynchronous Event Notification)
 	 */
@@ -6366,6 +6411,9 @@ static void megasas_detach_one(struct pci_dev *pdev)
 	if (instance->requestorId && !instance->skip_heartbeat_timer_del)
 		del_timer_sync(&instance->sriov_heartbeat_timer);
 
+	if (instance->is_ventura)
+		del_timer_sync(&instance->r1_fp_hold_timer);
+
 	if (instance->fw_crash_state != UNAVAILABLE)
 		megasas_free_host_crash_buffer(instance);
 	scsi_remove_host(instance->host);