[PATCH] drm/amdgpu: once more fix the call oder in amdgpu_ttm_move()
Alex Deucher
alexdeucher at gmail.com
Thu Mar 21 21:01:01 UTC 2024
On Thu, Mar 21, 2024 at 8:52 AM Christian König
<ckoenig.leichtzumerken at gmail.com> wrote:
>
> This reverts drm/amdgpu: fix ftrace event amdgpu_bo_move always move
> on same heap. The basic problem here is that after the move the old
> location is simply not available any more.
>
> Some fixes where suggested, but essentially we should call the move
where -> were
> notification before actually moving things because only this way we have
> the correct order for DMA-buf and VM move notifications as well.
>
> Also rework the statistic handling so that we don't update the eviction
> counter before the move.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 15 +++----
> drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 4 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 48 ++++++++++++----------
> 3 files changed, 37 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 425cebcc5cbf..eb7d824763b9 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -1245,19 +1245,20 @@ int amdgpu_bo_get_metadata(struct amdgpu_bo *bo, void *buffer,
> * amdgpu_bo_move_notify - notification about a memory move
> * @bo: pointer to a buffer object
> * @evict: if this move is evicting the buffer from the graphics address space
> + * @new_mem: new resource for backing the BO
> *
> * Marks the corresponding &amdgpu_bo buffer object as invalid, also performs
> * bookkeeping.
> * TTM driver callback which is called when ttm moves a buffer.
> */
> -void amdgpu_bo_move_notify(struct ttm_buffer_object *bo, bool evict)
> +void amdgpu_bo_move_notify(struct ttm_buffer_object *bo,
> + bool evict,
> + struct ttm_resource *new_mem)
> {
> struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
> + struct ttm_resource *old_mem = bo->resource;
> struct amdgpu_bo *abo;
>
> - if (!amdgpu_bo_is_amdgpu_bo(bo))
> - return;
> -
> abo = ttm_to_amdgpu_bo(bo);
> amdgpu_vm_bo_invalidate(adev, abo, evict);
>
> @@ -1267,9 +1268,9 @@ void amdgpu_bo_move_notify(struct ttm_buffer_object *bo, bool evict)
> bo->resource->mem_type != TTM_PL_SYSTEM)
> dma_buf_move_notify(abo->tbo.base.dma_buf);
>
> - /* remember the eviction */
> - if (evict)
> - atomic64_inc(&adev->num_evictions);
> + /* move_notify is called before move happens */
> + trace_amdgpu_bo_move(abo, new_mem ? new_mem->mem_type : -1,
> + old_mem ? old_mem->mem_type : -1);
> }
>
> void amdgpu_bo_get_memory(struct amdgpu_bo *bo,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> index a3ea8a82db23..d28e21baef16 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> @@ -344,7 +344,9 @@ int amdgpu_bo_set_metadata (struct amdgpu_bo *bo, void *metadata,
> int amdgpu_bo_get_metadata(struct amdgpu_bo *bo, void *buffer,
> size_t buffer_size, uint32_t *metadata_size,
> uint64_t *flags);
> -void amdgpu_bo_move_notify(struct ttm_buffer_object *bo, bool evict);
> +void amdgpu_bo_move_notify(struct ttm_buffer_object *bo,
> + bool evict,
> + struct ttm_resource *new_mem);
> void amdgpu_bo_release_notify(struct ttm_buffer_object *bo);
> vm_fault_t amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo);
> void amdgpu_bo_fence(struct amdgpu_bo *bo, struct dma_fence *fence,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index a5ceec7820cf..460b23918bfc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -471,14 +471,16 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
>
> if (!old_mem || (old_mem->mem_type == TTM_PL_SYSTEM &&
> bo->ttm == NULL)) {
> + amdgpu_bo_move_notify(bo, evict, new_mem);
> ttm_bo_move_null(bo, new_mem);
> - goto out;
> + return 0;
> }
> if (old_mem->mem_type == TTM_PL_SYSTEM &&
> (new_mem->mem_type == TTM_PL_TT ||
> new_mem->mem_type == AMDGPU_PL_PREEMPT)) {
> + amdgpu_bo_move_notify(bo, evict, new_mem);
> ttm_bo_move_null(bo, new_mem);
> - goto out;
> + return 0;
> }
> if ((old_mem->mem_type == TTM_PL_TT ||
> old_mem->mem_type == AMDGPU_PL_PREEMPT) &&
> @@ -488,9 +490,10 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> return r;
>
> amdgpu_ttm_backend_unbind(bo->bdev, bo->ttm);
> + amdgpu_bo_move_notify(bo, evict, new_mem);
> ttm_resource_free(bo, &bo->resource);
> ttm_bo_assign_mem(bo, new_mem);
> - goto out;
> + return 0;
> }
>
> if (old_mem->mem_type == AMDGPU_PL_GDS ||
> @@ -502,8 +505,9 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> new_mem->mem_type == AMDGPU_PL_OA ||
> new_mem->mem_type == AMDGPU_PL_DOORBELL) {
> /* Nothing to save here */
> + amdgpu_bo_move_notify(bo, evict, new_mem);
> ttm_bo_move_null(bo, new_mem);
> - goto out;
> + return 0;
> }
>
> if (bo->type == ttm_bo_type_device &&
> @@ -515,22 +519,23 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> abo->flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
> }
>
> - if (adev->mman.buffer_funcs_enabled) {
> - if (((old_mem->mem_type == TTM_PL_SYSTEM &&
> - new_mem->mem_type == TTM_PL_VRAM) ||
> - (old_mem->mem_type == TTM_PL_VRAM &&
> - new_mem->mem_type == TTM_PL_SYSTEM))) {
> - hop->fpfn = 0;
> - hop->lpfn = 0;
> - hop->mem_type = TTM_PL_TT;
> - hop->flags = TTM_PL_FLAG_TEMPORARY;
> - return -EMULTIHOP;
> - }
> + if (adev->mman.buffer_funcs_enabled &&
> + ((old_mem->mem_type == TTM_PL_SYSTEM &&
> + new_mem->mem_type == TTM_PL_VRAM) ||
> + (old_mem->mem_type == TTM_PL_VRAM &&
> + new_mem->mem_type == TTM_PL_SYSTEM))) {
> + hop->fpfn = 0;
> + hop->lpfn = 0;
> + hop->mem_type = TTM_PL_TT;
> + hop->flags = TTM_PL_FLAG_TEMPORARY;
> + return -EMULTIHOP;
> + }
>
> + amdgpu_bo_move_notify(bo, evict, new_mem);
> + if (adev->mman.buffer_funcs_enabled)
> r = amdgpu_move_blit(bo, evict, new_mem, old_mem);
> - } else {
> + else
> r = -ENODEV;
> - }
>
> if (r) {
> /* Check that all memory is CPU accessible */
> @@ -545,11 +550,10 @@ static int amdgpu_bo_move(struct ttm_buffer_object *bo, bool evict,
> return r;
> }
>
> - trace_amdgpu_bo_move(abo, new_mem->mem_type, old_mem->mem_type);
> -out:
> - /* update statistics */
> + /* update statistics after the move */
> + if (evict)
> + atomic64_inc(&adev->num_evictions);
> atomic64_add(bo->base.size, &adev->num_bytes_moved);
> - amdgpu_bo_move_notify(bo, evict);
> return 0;
> }
>
> @@ -1551,7 +1555,7 @@ static int amdgpu_ttm_access_memory(struct ttm_buffer_object *bo,
> static void
> amdgpu_bo_delete_mem_notify(struct ttm_buffer_object *bo)
> {
> - amdgpu_bo_move_notify(bo, false);
> + amdgpu_bo_move_notify(bo, false, NULL);
> }
>
> static struct ttm_device_funcs amdgpu_bo_driver = {
> --
> 2.34.1
>
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