[PATCH V6 10/13] megaraid_sas: v2 replace sdev_busy with local counter

Ming Lei
2021-01-18T00:53:05Z

From: Kashyap Desai <kashyap.desai@broadcom.com>

use local tracking of per sdev outstanding command since sdev_busy in
SML is improved for performance reason using sbitmap (earlier it was
atomic variable).

Cc: Omar Sandoval <osandov@fb.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumanesh Samanta <sumanesh.samanta@broadcom.com>
Cc: Ewan D. Milne <emilne@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>

Fix checkpatch ERROR and WARNING.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/scsi/megaraid/megaraid_sas.h | 2 +
drivers/scsi/megaraid/megaraid_sas_fusion.c | 44 ++++++++++++++++++---
2 files changed, 41 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 0f808d63580e..0c6a56b24c6e 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -2019,10 +2019,12 @@ union megasas_frame {
* struct MR_PRIV_DEVICE - sdev private hostdata
* @is_tm_capable: firmware managed tm_capable flag
* @tm_busy: TM request is in progress
+ * @sdev_priv_busy: pending command per sdev
*/
struct MR_PRIV_DEVICE {
bool is_tm_capable;
bool tm_busy;
+ atomic_t sdev_priv_busy;
atomic_t r1_ldio_hint;
u8 interface_type;
u8 task_abort_tmo;
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index b0c01cf0428f..62355cfca6da 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -220,6 +220,40 @@ megasas_clear_intr_fusion(struct megasas_instance *instance)
return 1;
}

+static inline void
+megasas_sdev_busy_inc(struct megasas_instance *instance,
+ struct scsi_cmnd *scmd)
+{
+ if (instance->perf_mode == MR_BALANCED_PERF_MODE) {
+ struct MR_PRIV_DEVICE *mr_device_priv_data =
+ scmd->device->hostdata;
+ atomic_inc(&mr_device_priv_data->sdev_priv_busy);
+ }
+}
+
+static inline void
+megasas_sdev_busy_dec(struct megasas_instance *instance,
+ struct scsi_cmnd *scmd)
+{
+ if (instance->perf_mode == MR_BALANCED_PERF_MODE) {
+ struct MR_PRIV_DEVICE *mr_device_priv_data =
+ scmd->device->hostdata;
+ atomic_dec(&mr_device_priv_data->sdev_priv_busy);
+ }
+}
+
+static inline int
+megasas_sdev_busy_read(struct megasas_instance *instance,
+ struct scsi_cmnd *scmd)
+{
+ if (instance->perf_mode == MR_BALANCED_PERF_MODE) {
+ struct MR_PRIV_DEVICE *mr_device_priv_data =
+ scmd->device->hostdata;
+ return atomic_read(&mr_device_priv_data->sdev_priv_busy);
+ }
+ return 0;
+}
+
/**
* megasas_get_cmd_fusion - Get a command from the free pool
* @instance: Adapter soft state
@@ -357,16 +391,13 @@ megasas_get_msix_index(struct megasas_instance *instance,
struct megasas_cmd_fusion *cmd,
u8 data_arms)
{
- int sdev_busy;
-
/* nr_hw_queue = 1 for MegaRAID */
struct blk_mq_hw_ctx *hctx =
scmd->device->request_queue->queue_hw_ctx[0];

- sdev_busy = atomic_read(&hctx->nr_active);
-
if (instance->perf_mode == MR_BALANCED_PERF_MODE &&
- sdev_busy > (data_arms * MR_DEVICE_HIGH_IOPS_DEPTH))
+ (megasas_sdev_busy_read(instance, scmd) >
+ (data_arms * MR_DEVICE_HIGH_IOPS_DEPTH)))
cmd->request_desc->SCSIIO.MSIxIndex =
mega_mod64((atomic64_add_return(1, &instance->high_iops_outstanding) /
MR_HIGH_IOPS_BATCH_COUNT), instance->low_latency_index_start);
@@ -3387,6 +3418,7 @@ megasas_build_and_issue_cmd_fusion(struct megasas_instance *instance,
* Issue the command to the FW
*/

+ megasas_sdev_busy_inc(instance, scmd);
megasas_fire_cmd_fusion(instance, req_desc);

if (r1_cmd)
@@ -3447,6 +3479,7 @@ megasas_complete_r1_command(struct megasas_instance *instance,
scmd_local->SCp.ptr = NULL;
megasas_return_cmd_fusion(instance, cmd);
scsi_dma_unmap(scmd_local);
+ megasas_sdev_busy_dec(instance, scmd_local);
scmd_local->scsi_done(scmd_local);
}
}
@@ -3547,6 +3580,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex,
scmd_local->SCp.ptr = NULL;
megasas_return_cmd_fusion(instance, cmd_fusion);
scsi_dma_unmap(scmd_local);
+ megasas_sdev_busy_dec(instance, scmd_local);
scmd_local->scsi_done(scmd_local);
} else /* Optimal VD - R1 FP command completion. */
megasas_complete_r1_command(instance, cmd_fusion);
--
2.28.0