RE: [PATCH V4 12/12] scsi: replace sdev->device_busy with sbitmap

[Kashyap Desai <kashyap.desai@broadcom.com>]

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> >
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@intel.com>
> >
> > All errors (new ones prefixed by >>):
> >
> > >> drivers/scsi/megaraid/megaraid_sas_fusion.c:365:41: error: no
member
> named 'device_busy' in 'struct scsi_device'
> >            sdev_busy = atomic_read(&scmd->device->device_busy);
>
> This new reference to sdev->device_busy is added by recent shared host
tag
> patch, and according to the comment, you may have planed to convert into
> one megaraid internal counter.
>
>         /* TBD - if sml remove device_busy in future, driver
>          * should track counter in internal structure.
>          */
>
> So can you post one patch? And I am happy to fold it into this series.

Ming - Please find the patch for megaraid_sas driver -
I have used helper inline function just for inter-operability with older
kernel to support in our out of box driver.
This way it will be easy for us to replace helper function as per kernel
version check.

Subject: [PATCH] megaraid_sas: replace sdev_busy with local counter

---
 drivers/scsi/megaraid/megaraid_sas.h        |  2 ++
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 34 ++++++++++++++++++---
 2 files changed, 32 insertions(+), 4 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 fd607287608e..e813ea0ad8b7 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -220,6 +220,32 @@ megasas_clear_intr_fusion(struct megasas_instance
*instance)
        return 1;
 }

+static inline void
+megasas_sdev_busy_inc(struct scsi_cmnd *scmd)
+{
+       struct MR_PRIV_DEVICE *mr_device_priv_data;
+
+       mr_device_priv_data = scmd->device->hostdata;
+       atomic_inc(&mr_device_priv_data->sdev_priv_busy);
+}
+static inline void
+megasas_sdev_busy_dec(struct scsi_cmnd *scmd)
+{
+       struct MR_PRIV_DEVICE *mr_device_priv_data;
+
+       mr_device_priv_data = scmd->device->hostdata;
+       atomic_dec(&mr_device_priv_data->sdev_priv_busy);
+}
+static inline int
+megasas_sdev_busy_read(struct scsi_cmnd *scmd)
+{
+       struct MR_PRIV_DEVICE *mr_device_priv_data;
+
+       mr_device_priv_data = scmd->device->hostdata;
+       return atomic_read(&mr_device_priv_data->sdev_priv_busy);
+}
+
+
 /**
  * megasas_get_cmd_fusion -    Get a command from the free pool
  * @instance:          Adapter soft state
@@ -359,10 +385,7 @@ megasas_get_msix_index(struct megasas_instance
*instance,
 {
        int sdev_busy;

-       /* TBD - if sml remove device_busy in future, driver
-        * should track counter in internal structure.
-        */
-       sdev_busy = atomic_read(&scmd->device->device_busy);
+       sdev_busy = megasas_sdev_busy_read(scmd);

        if (instance->perf_mode == MR_BALANCED_PERF_MODE &&
            sdev_busy > (data_arms * MR_DEVICE_HIGH_IOPS_DEPTH)) {
@@ -3390,6 +3413,7 @@ megasas_build_and_issue_cmd_fusion(struct
megasas_instance *instance,
         * Issue the command to the FW
         */

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

        if (r1_cmd)
@@ -3450,6 +3474,7 @@ 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(scmd_local);
                scmd_local->scsi_done(scmd_local);
        }
 }
@@ -3550,6 +3575,7 @@ 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(scmd_local);
                                scmd_local->scsi_done(scmd_local);
                        } else  /* Optimal VD - R1 FP command completion.
*/
                                megasas_complete_r1_command(instance,
cmd_fusion);
--
2.18.1

>
> Thanks,
> Ming

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