[PATCH v2 2/4] dma-buf: enable signaling for the stub fence on debug
Yadav, Arvind
arvyadav at amd.com
Fri Sep 9 16:32:34 UTC 2022
On 9/6/2022 12:39 PM, Christian König wrote:
>
>
> Am 05.09.22 um 18:35 schrieb Arvind Yadav:
>> Here's on debug enabling software signaling for the stub fence
>> which is always signaled. This fence should enable software
>> signaling otherwise the AMD GPU scheduler will cause a GPU reset
>> due to a GPU scheduler cleanup activity timeout.
>>
>> Signed-off-by: Arvind Yadav <Arvind.Yadav at amd.com>
>> ---
>>
>> Changes in v1 :
>> 1- Addressing Christian's comment to remove unnecessary callback.
>> 2- Replacing CONFIG_DEBUG_WW_MUTEX_SLOWPATH instead of CONFIG_DEBUG_FS.
>> 3- The version of this patch is also changed and previously
>> it was [PATCH 3/4]
>>
>> ---
>> drivers/dma-buf/dma-fence.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
>> index 066400ed8841..2378b12538c4 100644
>> --- a/drivers/dma-buf/dma-fence.c
>> +++ b/drivers/dma-buf/dma-fence.c
>> @@ -27,6 +27,10 @@ EXPORT_TRACEPOINT_SYMBOL(dma_fence_signaled);
>> static DEFINE_SPINLOCK(dma_fence_stub_lock);
>> static struct dma_fence dma_fence_stub;
>> +#ifdef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
>> +static bool __dma_fence_enable_signaling(struct dma_fence *fence);
>> +#endif
>> +
>
> I would rename the function to something like
> dma_fence_enable_signaling_locked().
>
> And please don't add any #ifdef if it isn't absolutely necessary. This
> makes the code pretty fragile.
>
>> /*
>> * fence context counter: each execution context should have its own
>> * fence context, this allows checking if fences belong to the same
>> @@ -136,6 +140,9 @@ struct dma_fence *dma_fence_get_stub(void)
>> &dma_fence_stub_ops,
>> &dma_fence_stub_lock,
>> 0, 0);
>> +#ifdef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
>> + __dma_fence_enable_signaling(&dma_fence_stub);
>> +#endif
>
> Alternatively in this particular case you could just set the bit
> manually here since this is part of the dma_fence code anyway.
>
> Christian.
>
As per per review comment. I will set the bit manually.
~arvind
>> dma_fence_signal_locked(&dma_fence_stub);
>> }
>> spin_unlock(&dma_fence_stub_lock);
>
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