Re: [PATCH 2/2] drm/amd/display: use ttm_eu_reserve_buffers instead of amdgpu_bo_reserve

["Koenig, Christian" <Christian.Koenig-5C7GfCeVMHo@public.gmane.org>]

Am 07.05.19 um 11:36 schrieb Chunming Zhou:
> add ticket for display bo, so that it can preempt busy bo.
>
> Change-Id: I9f031cdcc8267de00e819ae303baa0a52df8ebb9
> Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
> ---
>   .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 22 ++++++++++++++-----
>   1 file changed, 17 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index ac22f7351a42..8633d52e3fbe 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4176,6 +4176,9 @@ static int dm_plane_helper_prepare_fb(struct drm_plane *plane,
>   	struct amdgpu_device *adev;
>   	struct amdgpu_bo *rbo;
>   	struct dm_plane_state *dm_plane_state_new, *dm_plane_state_old;
> +	struct list_head list, duplicates;
> +	struct ttm_validate_buffer tv;
> +	struct ww_acquire_ctx ticket;
>   	uint64_t tiling_flags;
>   	uint32_t domain;
>   	int r;
> @@ -4192,9 +4195,18 @@ static int dm_plane_helper_prepare_fb(struct drm_plane *plane,
>   	obj = new_state->fb->obj[0];
>   	rbo = gem_to_amdgpu_bo(obj);
>   	adev = amdgpu_ttm_adev(rbo->tbo.bdev);
> -	r = amdgpu_bo_reserve(rbo, false);
> -	if (unlikely(r != 0))
> +	INIT_LIST_HEAD(&list);
> +	INIT_LIST_HEAD(&duplicates);
> +
> +	tv.bo = &rbo->tbo;
> +	tv.num_shared = 1;
> +	list_add(&tv.head, &list);
> +
> +	r = ttm_eu_reserve_buffers(&ticket, &list, false, &duplicates);

duplicates are superfluous and can be NULL in this case.

Apart from that the patch is Reviewed-by: Christian König 
<christian.koenig@amd.com>

Regards,
Christian.

> +	if (r) {
> +		dev_err(adev->dev, "fail to reserve bo (%d)\n", r);
>   		return r;
> +	}
>   
>   	if (plane->type != DRM_PLANE_TYPE_CURSOR)
>   		domain = amdgpu_display_supported_domains(adev);
> @@ -4205,21 +4217,21 @@ static int dm_plane_helper_prepare_fb(struct drm_plane *plane,
>   	if (unlikely(r != 0)) {
>   		if (r != -ERESTARTSYS)
>   			DRM_ERROR("Failed to pin framebuffer with error %d\n", r);
> -		amdgpu_bo_unreserve(rbo);
> +		ttm_eu_backoff_reservation(&ticket, &list);
>   		return r;
>   	}
>   
>   	r = amdgpu_ttm_alloc_gart(&rbo->tbo);
>   	if (unlikely(r != 0)) {
>   		amdgpu_bo_unpin(rbo);
> -		amdgpu_bo_unreserve(rbo);
> +		ttm_eu_backoff_reservation(&ticket, &list);
>   		DRM_ERROR("%p bind failed\n", rbo);
>   		return r;
>   	}
>   
>   	amdgpu_bo_get_tiling_flags(rbo, &tiling_flags);
>   
> -	amdgpu_bo_unreserve(rbo);
> +	ttm_eu_backoff_reservation(&ticket, &list);
>   
>   	afb->address = amdgpu_bo_gpu_offset(rbo);
>   

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