On Mon, Mar 21, 2022 at 02:58:51PM +0100, Christian König wrote:
> We can now add multiple writers to the dma_resv object.
>
> Also enable the check for not adding containers in dma_resv.c again.
>
> Signed-off-by: Christian König <christian.koe...@amd.com>
> Cc: amd-...@lists.freedesktop.org
It's a bit much magic, but that's the entire point of your huge prep
series to be able to have all the fences on a dma-resv :-)
Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
> ---
> drivers/dma-buf/dma-resv.c | 6 +--
> drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h | 1 -
> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 51 ++-------------------
> 3 files changed, 8 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
> index 26257ba1527e..10d70812373c 100644
> --- a/drivers/dma-buf/dma-resv.c
> +++ b/drivers/dma-buf/dma-resv.c
> @@ -308,10 +308,10 @@ void dma_resv_add_fence(struct dma_resv *obj, struct
> dma_fence *fence,
>
> dma_resv_assert_held(obj);
>
> - /* TODO: Drivers should not add containers here, instead add each fence
> - * individually. Disabled for now until we cleaned up amdgpu/ttm.
> + /* Drivers should not add containers here, instead add each fence
> + * individually.
> */
> - /* WARN_ON(dma_fence_is_container(fence)); */
> + WARN_ON(dma_fence_is_container(fence));
>
> fobj = dma_resv_fences_list(obj);
> count = fobj->num_fences;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> index 044b41f0bfd9..529d52a204cf 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.h
> @@ -34,7 +34,6 @@ struct amdgpu_fpriv;
> struct amdgpu_bo_list_entry {
> struct ttm_validate_buffer tv;
> struct amdgpu_bo_va *bo_va;
> - struct dma_fence_chain *chain;
> uint32_t priority;
> struct page **user_pages;
> bool user_invalidated;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> index 1c039db976a9..88009833f523 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
> @@ -575,14 +575,6 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser
> *p,
> struct amdgpu_bo *bo = ttm_to_amdgpu_bo(e->tv.bo);
>
> e->bo_va = amdgpu_vm_bo_find(vm, bo);
> -
> - if (bo->tbo.base.dma_buf && !amdgpu_bo_explicit_sync(bo)) {
> - e->chain = dma_fence_chain_alloc();
> - if (!e->chain) {
> - r = -ENOMEM;
> - goto error_validate;
> - }
> - }
> }
>
> amdgpu_cs_get_threshold_for_moves(p->adev, &p->bytes_moved_threshold,
> @@ -633,13 +625,8 @@ static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser
> *p,
> }
>
> error_validate:
> - if (r) {
> - amdgpu_bo_list_for_each_entry(e, p->bo_list) {
> - dma_fence_chain_free(e->chain);
> - e->chain = NULL;
> - }
> + if (r)
> ttm_eu_backoff_reservation(&p->ticket, &p->validated);
> - }
> out:
> return r;
> }
> @@ -679,17 +666,9 @@ static void amdgpu_cs_parser_fini(struct
> amdgpu_cs_parser *parser, int error,
> {
> unsigned i;
>
> - if (error && backoff) {
> - struct amdgpu_bo_list_entry *e;
> -
> - amdgpu_bo_list_for_each_entry(e, parser->bo_list) {
> - dma_fence_chain_free(e->chain);
> - e->chain = NULL;
> - }
> -
> + if (error && backoff)
> ttm_eu_backoff_reservation(&parser->ticket,
> &parser->validated);
> - }
>
> for (i = 0; i < parser->num_post_deps; i++) {
> drm_syncobj_put(parser->post_deps[i].syncobj);
> @@ -1264,29 +1243,9 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
>
> amdgpu_vm_move_to_lru_tail(p->adev, &fpriv->vm);
>
> - amdgpu_bo_list_for_each_entry(e, p->bo_list) {
> - struct dma_resv *resv = e->tv.bo->base.resv;
> - struct dma_fence_chain *chain = e->chain;
> - struct dma_resv_iter cursor;
> - struct dma_fence *fence;
> -
> - if (!chain)
> - continue;
> -
> - /*
> - * Work around dma_resv shortcommings by wrapping up the
> - * submission in a dma_fence_chain and add it as exclusive
> - * fence.
> - */
> - dma_resv_for_each_fence(&cursor, resv,
> - DMA_RESV_USAGE_WRITE,
> - fence) {
> - break;
> - }
> - dma_fence_chain_init(chain, fence, dma_fence_get(p->fence), 1);
> - dma_resv_add_fence(resv, &chain->base, DMA_RESV_USAGE_WRITE);
> - e->chain = NULL;
> - }
> + /* Make sure all BOs are remembered as writers */
> + amdgpu_bo_list_for_each_entry(e, p->bo_list)
> + e->tv.num_shared = 0;
>
> ttm_eu_fence_buffer_objects(&p->ticket, &p->validated, p->fence);
> mutex_unlock(&p->adev->notifier_lock);
> --
> 2.25.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
