linux-kernel - Re: [PATCH 2/4] drm/sched: Add callback and enable signaling on debug

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Message-ID: <5b84f7c1-99a6-02c8-2606-8986891a95b0@amd.com>
Date:   Mon, 5 Sep 2022 19:16:19 +0530
From:   "Yadav, Arvind" <arvyadav@....com>
To:     Christian König <christian.koenig@....com>,
        Arvind Yadav <Arvind.Yadav@....com>, andrey.grodzovsky@....com,
        shashank.sharma@....com, amaranath.somalapuram@....com,
        Arunpravin.PaneerSelvam@....com, sumit.semwal@...aro.org,
        gustavo@...ovan.org, airlied@...ux.ie, daniel@...ll.ch,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] drm/sched: Add callback and enable signaling on debug


On 9/5/2022 4:55 PM, Christian König wrote:
>
>
> Am 05.09.22 um 12:56 schrieb Arvind Yadav:
>> Here's on debug adding an enable_signaling callback for finished
>> fences and enabling software signaling for finished fence.
>>
>> Signed-off-by: Arvind Yadav <Arvind.Yadav@....com>
>> ---
>>   drivers/gpu/drm/scheduler/sched_fence.c | 12 ++++++++++++
>>   drivers/gpu/drm/scheduler/sched_main.c  |  4 +++-
>>   2 files changed, 15 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/scheduler/sched_fence.c 
>> b/drivers/gpu/drm/scheduler/sched_fence.c
>> index 7fd869520ef2..ebd26cdb79a0 100644
>> --- a/drivers/gpu/drm/scheduler/sched_fence.c
>> +++ b/drivers/gpu/drm/scheduler/sched_fence.c
>> @@ -122,16 +122,28 @@ static void 
>> drm_sched_fence_release_finished(struct dma_fence *f)
>>         dma_fence_put(&fence->scheduled);
>>   }
>> +#ifdef CONFIG_DEBUG_FS
>> +static bool drm_sched_enable_signaling(struct dma_fence *f)
>> +{
>> +    return true;
>> +}
>> +#endif
>>     static const struct dma_fence_ops drm_sched_fence_ops_scheduled = {
>>       .get_driver_name = drm_sched_fence_get_driver_name,
>>       .get_timeline_name = drm_sched_fence_get_timeline_name,
>> +#ifdef CONFIG_DEBUG_FS
>> +    .enable_signaling = drm_sched_enable_signaling,
>> +#endif
>>       .release = drm_sched_fence_release_scheduled,
>>   };
>>     static const struct dma_fence_ops drm_sched_fence_ops_finished = {
>>       .get_driver_name = drm_sched_fence_get_driver_name,
>>       .get_timeline_name = drm_sched_fence_get_timeline_name,
>> +#ifdef CONFIG_DEBUG_FS
>> +    .enable_signaling = drm_sched_enable_signaling,
>> +#endif
>
> Adding the callback should not be necessary.
sure, I will remove this change.
>
>>       .release = drm_sched_fence_release_finished,
>>   };
>>   diff --git a/drivers/gpu/drm/scheduler/sched_main.c 
>> b/drivers/gpu/drm/scheduler/sched_main.c
>> index e0ab14e0fb6b..140e3d8646e2 100644
>> --- a/drivers/gpu/drm/scheduler/sched_main.c
>> +++ b/drivers/gpu/drm/scheduler/sched_main.c
>> @@ -961,7 +961,9 @@ static int drm_sched_main(void *param)
>>               s_fence->parent = dma_fence_get(fence);
>>               /* Drop for original kref_init of the fence */
>>               dma_fence_put(fence);
>
> Uff, not related to your patch but that looks wrong to me. The 
> reference can only be dropped after the call to dma_fence_add_callback().
>
Shall I take care with this patch or I will submit separate one ?
>> -
>> +#ifdef CONFIG_DEBUG_FS
>> + dma_fence_enable_sw_signaling(&s_fence->finished);
>> +#endif
>
> This should always be called, independent of the config options set.
>
> Christian.

sure, I will remove the Config check.

~arvind

>
>>               r = dma_fence_add_callback(fence, &sched_job->cb,
>>                              drm_sched_job_done_cb);
>>               if (r == -ENOENT)
>