diff mbox series

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

Message ID 20241003-preemption-a750-t-v8-9-5c6cb9f256e0@gmail.com
State New
Headers show
Series Preemption support for A7XX | expand

Commit Message

Antonino Maniscalco Oct. 3, 2024, 4:12 p.m. UTC 
Add trace points corresponding to preemption being triggered and being
completed for latency measurement purposes.

Reviewed-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Tested-by: Rob Clark <robdclark@gmail.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-QRD
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8450-HDK
Signed-off-by: Antonino Maniscalco <antomani103@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(+)

Comments

Kees Bakker Oct. 8, 2024, 9:10 p.m. UTC | #1 
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@quicinc.com>
> Tested-by: Rob Clark <robdclark@gmail.com>
> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-QRD
> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8450-HDK
> Signed-off-by: Antonino Maniscalco <antomani103@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);
Antonino Maniscalco Oct. 16, 2024, 12:13 p.m. UTC | #2 
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@quicinc.com>
>> Tested-by: Rob Clark <robdclark@gmail.com>
>> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-QRD
>> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
>> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8450-HDK
>> Signed-off-by: Antonino Maniscalco <antomani103@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,
Rob Clark Oct. 16, 2024, 8:33 p.m. UTC | #3 
On Wed, Oct 16, 2024 at 5:13 AM Antonino Maniscalco
<antomani103@gmail.com> wrote:
>
> 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@quicinc.com>
> >> Tested-by: Rob Clark <robdclark@gmail.com>
> >> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-QRD
> >> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
> >> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8450-HDK
> >> Signed-off-by: Antonino Maniscalco <antomani103@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.

Yes, please send a new commit, I don't want to re-write history on msm-next

BR,
-R

> Best regards,
> --
> Antonino Maniscalco <antomani103@gmail.com>
Antonino Maniscalco Oct. 16, 2024, 9:28 p.m. UTC | #4 
On 10/16/24 10:33 PM, Rob Clark wrote:
> On Wed, Oct 16, 2024 at 5:13 AM Antonino Maniscalco
> <antomani103@gmail.com> wrote:
>>
>> 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@quicinc.com>
>>>> Tested-by: Rob Clark <robdclark@gmail.com>
>>>> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8650-QRD
>>>> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
>>>> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8450-HDK
>>>> Signed-off-by: Antonino Maniscalco <antomani103@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.
> 
> Yes, please send a new commit, I don't want to re-write history on msm-next

Makes sense.
I noticed somebody else has already sent the patch for it 
https://lore.kernel.org/linux-arm-msm/20241011052315.4713-1-everestkc@everestkc.com.np/

> 
> BR,
> -R
> 
>> Best regards,
>> --
>> Antonino Maniscalco <antomani103@gmail.com>


Best regards,
diff mbox series

Patch

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);
+
 	spin_unlock_irqrestore(&ring->preempt_lock, flags);
 
 	gpu_write64(gpu,
diff --git a/drivers/gpu/drm/msm/msm_gpu_trace.h b/drivers/gpu/drm/msm/msm_gpu_trace.h
index ac40d857bc4578377b03b4cedd138c87144997e4..7f863282db0d7812c8fd53b3f1fc0cd5635028ba 100644
--- a/drivers/gpu/drm/msm/msm_gpu_trace.h
+++ b/drivers/gpu/drm/msm/msm_gpu_trace.h
@@ -177,6 +177,34 @@  TRACE_EVENT(msm_gpu_resume,
 		TP_printk("%u", __entry->dummy)
 );
 
+TRACE_EVENT(msm_gpu_preemption_trigger,
+		TP_PROTO(int ring_id_from, int ring_id_to),
+		TP_ARGS(ring_id_from, ring_id_to),
+		TP_STRUCT__entry(
+			__field(int, ring_id_from)
+			__field(int, ring_id_to)
+			),
+		TP_fast_assign(
+			__entry->ring_id_from = ring_id_from;
+			__entry->ring_id_to = ring_id_to;
+			),
+		TP_printk("preempting %u -> %u",
+			  __entry->ring_id_from,
+			  __entry->ring_id_to)
+);
+
+TRACE_EVENT(msm_gpu_preemption_irq,
+		TP_PROTO(u32 ring_id),
+		TP_ARGS(ring_id),
+		TP_STRUCT__entry(
+			__field(u32, ring_id)
+			),
+		TP_fast_assign(
+			__entry->ring_id = ring_id;
+			),
+		TP_printk("preempted to %u", __entry->ring_id)
+);
+
 #endif
 
 #undef TRACE_INCLUDE_PATH