[v8,09/12] drm/msm/a6xx: Add traces for preemption

[Antonino Maniscalco]

On 10/8/24 11:10 PM, Kees Bakker wrote:
> Op 03-10-2024 om 18:12 schreef Antonino Maniscalco:
>> Add trace points corresponding to preemption being triggered and being
>> completed for latency measurement purposes.
>>
>> Reviewed-by: Akhil P Oommen <quic_akhilpo at quicinc.com>
>> Tested-by: Rob Clark <robdclark at gmail.com>
>> Tested-by: Neil Armstrong <neil.armstrong at linaro.org> # on SM8650-QRD
>> Tested-by: Neil Armstrong <neil.armstrong at linaro.org> # on SM8550-QRD
>> Tested-by: Neil Armstrong <neil.armstrong at linaro.org> # on SM8450-HDK
>> Signed-off-by: Antonino Maniscalco <antomani103 at gmail.com>
>> ---
>>   drivers/gpu/drm/msm/adreno/a6xx_preempt.c |  6 ++++++
>>   drivers/gpu/drm/msm/msm_gpu_trace.h       | 28 +++++++++++++++++++++ 
>> +++++++
>>   2 files changed, 34 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_preempt.c b/drivers/gpu/ 
>> drm/msm/adreno/a6xx_preempt.c
>> index 
>> 21e333cb6342d33425eb96f97bcc853e9b041b36..6803d5af60cc8fb0f2a52ee160ffdbf0e8ef0209 100644
>> --- a/drivers/gpu/drm/msm/adreno/a6xx_preempt.c
>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_preempt.c
>> @@ -7,6 +7,7 @@
>>   #include "a6xx_gpu.h"
>>   #include "a6xx_gmu.xml.h"
>>   #include "msm_mmu.h"
>> +#include "msm_gpu_trace.h"
>>   /*
>>    * Try to transition the preemption state from old to new. Return
>> @@ -174,6 +175,8 @@ void a6xx_preempt_irq(struct msm_gpu *gpu)
>>       set_preempt_state(a6xx_gpu, PREEMPT_NONE);
>> +    trace_msm_gpu_preemption_irq(a6xx_gpu->cur_ring->id);
>> +
>>       /*
>>        * Retrigger preemption to avoid a deadlock that might occur 
>> when preemption
>>        * is skipped due to it being already in flight when requested.
>> @@ -294,6 +297,9 @@ void a6xx_preempt_trigger(struct msm_gpu *gpu)
>>        */
>>       ring->restore_wptr = false;
>> +    trace_msm_gpu_preemption_trigger(a6xx_gpu->cur_ring->id,
>> +        ring ? ring->id : -1);
>> +
> There is no need for the ternary operator. "ring" should be non-NULL, 
> otherwise the code would have already crashed.
> So the change can just be
>      trace_msm_gpu_preemption_trigger(a6xx_gpu->cur_ring->id, ring->id);

You are right, we had a similar cleanup but I missed this particular 
one, thanks for pointing me at it! I apologize for the late response but 
I've been at XDC and therefore unable to look at my email. I will point 
this out to Rob since this series is in msm-next to see if I need to 
send a separate patch to clean this.

Best regards,
-- 
Antonino Maniscalco <antomani103 at gmail.com>