linux-kernel - Re: [PATCH v2 10/20] drm/admgpu: handle resv dependencies in amdgpu_ttm_map

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Message-ID: <ebb52a9a-9454-471b-8262-098231b58777@amd.com>
Date: Mon, 17 Nov 2025 09:44:29 +0100
From: Christian König <christian.koenig@....com>
To: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>,
 Alex Deucher <alexander.deucher@....com>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Sumit Semwal <sumit.semwal@...aro.org>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v2 10/20] drm/admgpu: handle resv dependencies in
 amdgpu_ttm_map_buffer

On 11/13/25 17:05, Pierre-Eric Pelloux-Prayer wrote:
> If a resv object is passed, its fences are treated as a dependency
> for the amdgpu_ttm_map_buffer operation.
> 
> This will be used by amdgpu_bo_release_notify through
> amdgpu_fill_buffer.

Why should updating the GART window depend on fences in a resv object?

Regards,
Christian.

> 
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 16 +++++++++++-----
>  1 file changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index b13f0993dbf1..411997db70eb 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -184,7 +184,8 @@ static int amdgpu_ttm_map_buffer(struct drm_sched_entity *entity,
>  				 struct amdgpu_res_cursor *mm_cur,
>  				 unsigned int window, struct amdgpu_ring *ring,
>  				 bool tmz, uint64_t *size, uint64_t *addr,
> -				 struct dma_fence *dep)
> +				 struct dma_fence *dep,
> +				 struct dma_resv *resv)
>  {
>  	struct amdgpu_device *adev = ring->adev;
>  	unsigned int offset, num_pages, num_dw, num_bytes;
> @@ -239,6 +240,10 @@ static int amdgpu_ttm_map_buffer(struct drm_sched_entity *entity,
>  	if (dep)
>  		drm_sched_job_add_dependency(&job->base, dma_fence_get(dep));
>  
> +	if (resv)
> +		drm_sched_job_add_resv_dependencies(&job->base, resv,
> +						    DMA_RESV_USAGE_BOOKKEEP);
> +
>  	src_addr = num_dw * 4;
>  	src_addr += job->ibs[0].gpu_addr;
>  
> @@ -332,14 +337,14 @@ static int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
>  		r = amdgpu_ttm_map_buffer(&entity->base,
>  					  src->bo, src->mem, &src_mm,
>  					  entity->gart_window_id0, ring, tmz, &cur_size, &from,
> -					  NULL);
> +					  NULL, NULL);
>  		if (r)
>  			goto error;
>  
>  		r = amdgpu_ttm_map_buffer(&entity->base,
>  					  dst->bo, dst->mem, &dst_mm,
>  					  entity->gart_window_id1, ring, tmz, &cur_size, &to,
> -					  NULL);
> +					  NULL, NULL);
>  		if (r)
>  			goto error;
>  
> @@ -2451,7 +2456,7 @@ int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo,
>  		r = amdgpu_ttm_map_buffer(&entity->base,
>  					  &bo->tbo, bo->tbo.resource, &cursor,
>  					  entity->gart_window_id1, ring, false, &size, &addr,
> -					  NULL);
> +					  NULL, NULL);
>  		if (r)
>  			goto err;
>  
> @@ -2506,7 +2511,8 @@ int amdgpu_fill_buffer(struct amdgpu_ttm_buffer_entity *entity,
>  					  &bo->tbo, bo->tbo.resource, &dst,
>  					  entity->gart_window_id1, ring, false,
>  					  &cur_size, &to,
> -					  dependency);
> +					  dependency,
> +					  resv);
>  		if (r)
>  			goto error;
>