[PATCH 02/28] drm/ttm: stop pruning fences after wait

[Christian König]

Am 30.11.21 um 10:02 schrieb Daniel Vetter:
> On Mon, Nov 29, 2021 at 01:06:33PM +0100, Christian König wrote:
>> This is just abusing internals of the dma_resv object.
>>
>> Signed-off-by: Christian König <christian.koenig at amd.com>
> Yeah I think if we want this back we could do a _locked version of the
> wait, which prunes internally.
>
> Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
>
> Btw I wonder, should we put the ttm_bo_wait wrapper on the chopping block
> in gpu/todo.rst? It's really just complications I think in most cases. And
> it would be nice if ttm has the same errno semantics for these as everyone
> else, I always get very confused about this stuff ...

I've already done that quite a bit, e.g. removed most of the users.

What's left are the cases where we wait or test signaling inside of TTM 
and I think I can get rid of that with the LRU rework.

So yeah, already in the pipeline.

Regards,
Christian.

>
> Cheers, Daniel
>
>> ---
>>   drivers/gpu/drm/ttm/ttm_bo.c | 1 -
>>   1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
>> index e4a20a3a5d16..fc124457ba2f 100644
>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>> @@ -1086,7 +1086,6 @@ int ttm_bo_wait(struct ttm_buffer_object *bo,
>>   	if (timeout == 0)
>>   		return -EBUSY;
>>   
>> -	dma_resv_add_excl_fence(bo->base.resv, NULL);
>>   	return 0;
>>   }
>>   EXPORT_SYMBOL(ttm_bo_wait);
>> -- 
>> 2.25.1
>>