Thread (33 messages) 33 messages, 5 authors, 2020-11-19

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

From: Ming Lei <hidden>
Date: 2020-11-19 06:34:57
Also in: linux-scsi, oe-kbuild-all

On Thu, Nov 19, 2020 at 11:50:39AM +0530, Kashyap Desai wrote:
quoted hunk ↗ jump to hunk
quoted
quoted
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <redacted>

All errors (new ones prefixed by >>):
quoted
quoted
drivers/scsi/megaraid/megaraid_sas_fusion.c:365:41: error: no
member
quoted
named 'device_busy' in 'struct scsi_device'
quoted
           sdev_busy = atomic_read(&scmd->device->device_busy);
This new reference to sdev->device_busy is added by recent shared host
tag
quoted
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);
The above is only used for MR_BALANCED_PERF_MODE, so maybe you can
skip inc/dec/read the counter for other perf mode.



Thanks, 
Ming
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