[AMD Official Use Only - Internal Distribution Only]
Acked-by: Ramesh Errabolu <ramesh.errab...@amd.com>
-----Original Message-----
From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> On Behalf Of Christian
König
Sent: Thursday, April 22, 2021 6:20 AM
To: Kuehling, Felix <felix.kuehl...@amd.com>; amd-...@lists.freedesktop.org;
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH v2 10/10] drm/amdgpu: Move dmabuf attach/detach to
backend_(un)bind
Am 22.04.21 um 03:30 schrieb Felix Kuehling:
> The dmabuf attachment should be updated by moving the SG BO to
> DOMAIN_CPU and back to DOMAIN_GTT. This does not necessarily invoke
> the populate/unpopulate callbacks. Do this in backend_bind/unbind instead.
>
> Signed-off-by: Felix Kuehling <felix.kuehl...@amd.com>
Reviewed-by: Christian König <christian.koe...@amd.com>
> ---
> .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 3 --
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 51 +++++++++----------
> 2 files changed, 25 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index 18a1f9222a59..68e6ce8dcf33 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -582,9 +582,6 @@ kfd_mem_dmaunmap_dmabuf(struct kfd_mem_attachment
> *attachment)
>
> amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
> ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
> - /* FIXME: This does not guarantee that amdgpu_ttm_tt_unpopulate is
> - * called
> - */
> }
>
> static void
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 7e7d8330d64b..fc2a8d681dbc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -910,7 +910,23 @@ static int amdgpu_ttm_backend_bind(struct ttm_device
> *bdev,
> DRM_ERROR("failed to pin userptr\n");
> return r;
> }
> + } else if (ttm->page_flags & TTM_PAGE_FLAG_SG) {
> + if (!ttm->sg) {
> + struct dma_buf_attachment *attach;
> + struct sg_table *sgt;
> +
> + attach = gtt->gobj->import_attach;
> + sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
> + if (IS_ERR(sgt))
> + return PTR_ERR(sgt);
> +
> + ttm->sg = sgt;
> + }
> +
> + drm_prime_sg_to_dma_addr_array(ttm->sg, gtt->ttm.dma_address,
> + ttm->num_pages);
> }
> +
> if (!ttm->num_pages) {
> WARN(1, "nothing to bind %u pages for mreg %p back %p!\n",
> ttm->num_pages, bo_mem, ttm); @@ -1037,8 +1053,15 @@
> static
> void amdgpu_ttm_backend_unbind(struct ttm_device *bdev,
> int r;
>
> /* if the pages have userptr pinning then clear that first */
> - if (gtt->userptr)
> + if (gtt->userptr) {
> amdgpu_ttm_tt_unpin_userptr(bdev, ttm);
> + } else if (ttm->sg && gtt->gobj->import_attach) {
> + struct dma_buf_attachment *attach;
> +
> + attach = gtt->gobj->import_attach;
> + dma_buf_unmap_attachment(attach, ttm->sg, DMA_BIDIRECTIONAL);
> + ttm->sg = NULL;
> + }
>
> if (!gtt->bound)
> return;
> @@ -1125,23 +1148,8 @@ static int amdgpu_ttm_tt_populate(struct ttm_device
> *bdev,
> return 0;
> }
>
> - if (ttm->page_flags & TTM_PAGE_FLAG_SG) {
> - if (!ttm->sg) {
> - struct dma_buf_attachment *attach;
> - struct sg_table *sgt;
> -
> - attach = gtt->gobj->import_attach;
> - sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
> - if (IS_ERR(sgt))
> - return PTR_ERR(sgt);
> -
> - ttm->sg = sgt;
> - }
> -
> - drm_prime_sg_to_dma_addr_array(ttm->sg, gtt->ttm.dma_address,
> - ttm->num_pages);
> + if (ttm->page_flags & TTM_PAGE_FLAG_SG)
> return 0;
> - }
>
> return ttm_pool_alloc(&adev->mman.bdev.pool, ttm, ctx);
> }
> @@ -1165,15 +1173,6 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device
> *bdev,
> return;
> }
>
> - if (ttm->sg && gtt->gobj->import_attach) {
> - struct dma_buf_attachment *attach;
> -
> - attach = gtt->gobj->import_attach;
> - dma_buf_unmap_attachment(attach, ttm->sg, DMA_BIDIRECTIONAL);
> - ttm->sg = NULL;
> - return;
> - }
> -
> if (ttm->page_flags & TTM_PAGE_FLAG_SG)
> return;
>
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