[PATCH] drm/ttm: use the parent resv for ghost objects v2

[Christian König]

Ping?

Am 18.10.19 um 13:58 schrieb Christian König:
> This way the TTM is destroyed with the correct dma_resv object
> locked and we can even pipeline imported BO evictions.
>
> v2: Limit this to only cases when the parent object uses a separate
>      reservation object as well. This fixes another OOM problem.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> ---
>   drivers/gpu/drm/ttm/ttm_bo_util.c | 16 +++++++++-------
>   1 file changed, 9 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
> index e030c27f53cf..45e440f80b7b 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
> @@ -512,7 +512,9 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
>   	kref_init(&fbo->base.kref);
>   	fbo->base.destroy = &ttm_transfered_destroy;
>   	fbo->base.acc_size = 0;
> -	fbo->base.base.resv = &fbo->base.base._resv;
> +	if (bo->base.resv == &bo->base._resv)
> +		fbo->base.base.resv = &fbo->base.base._resv;
> +
>   	dma_resv_init(fbo->base.base.resv);
>   	ret = dma_resv_trylock(fbo->base.base.resv);
>   	WARN_ON(!ret);
> @@ -711,7 +713,7 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
>   		if (ret)
>   			return ret;
>   
> -		dma_resv_add_excl_fence(ghost_obj->base.resv, fence);
> +		dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
>   
>   		/**
>   		 * If we're not moving to fixed memory, the TTM object
> @@ -724,7 +726,7 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
>   		else
>   			bo->ttm = NULL;
>   
> -		ttm_bo_unreserve(ghost_obj);
> +		dma_resv_unlock(&ghost_obj->base._resv);
>   		ttm_bo_put(ghost_obj);
>   	}
>   
> @@ -767,7 +769,7 @@ int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
>   		if (ret)
>   			return ret;
>   
> -		dma_resv_add_excl_fence(ghost_obj->base.resv, fence);
> +		dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
>   
>   		/**
>   		 * If we're not moving to fixed memory, the TTM object
> @@ -780,7 +782,7 @@ int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
>   		else
>   			bo->ttm = NULL;
>   
> -		ttm_bo_unreserve(ghost_obj);
> +		dma_resv_unlock(&ghost_obj->base._resv);
>   		ttm_bo_put(ghost_obj);
>   
>   	} else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
> @@ -836,7 +838,7 @@ int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
>   	if (ret)
>   		return ret;
>   
> -	ret = dma_resv_copy_fences(ghost->base.resv, bo->base.resv);
> +	ret = dma_resv_copy_fences(&ghost->base._resv, bo->base.resv);
>   	/* Last resort, wait for the BO to be idle when we are OOM */
>   	if (ret)
>   		ttm_bo_wait(bo, false, false);
> @@ -845,7 +847,7 @@ int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
>   	bo->mem.mem_type = TTM_PL_SYSTEM;
>   	bo->ttm = NULL;
>   
> -	ttm_bo_unreserve(ghost);
> +	dma_resv_unlock(&ghost->base._resv);
>   	ttm_bo_put(ghost);
>   
>   	return 0;