Re: [PATCH 6/6] drm/amdgpu: add support for exporting VRAM using DMA-buf v2

[Alex Deucher <alexdeucher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On Thu, Apr 18, 2019 at 8:09 AM Christian König
<ckoenig.leichtzumerken@gmail.com> wrote:
>
> We should be able to do this now after checking all the prerequisites.
>
> v2: fix entrie count in the sgt
>
> Signed-off-by: Christian König <christian.koenig@amd.com>

Series is:
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c    | 46 ++++++++--
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h      |  9 ++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 96 ++++++++++++++++++++
>  3 files changed, 142 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
> index a290ae830b11..55bb39281c5d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
> @@ -318,22 +318,45 @@ amdgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
>         }
>
>         if (attach->invalidate) {
> -               /* move buffer into GTT */
> +               /* move buffer into GTT or VRAM */
>                 struct ttm_operation_ctx ctx = { false, false };
> +               unsigned domains = AMDGPU_GEM_DOMAIN_GTT;
>
> -               amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);
> +               if (bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM &&
> +                   attach->peer2peer) {
> +                       bo->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
> +                       domains |= AMDGPU_GEM_DOMAIN_VRAM;
> +               }
> +               amdgpu_bo_placement_from_domain(bo, domains);
>                 r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
>                 if (r)
>                         return ERR_PTR(r);
>         }
>
> -       sgt = drm_prime_pages_to_sg(bo->tbo.ttm->pages, bo->tbo.num_pages);
> -       if (IS_ERR(sgt))
> -               return sgt;
> +       switch (bo->tbo.mem.mem_type) {
> +       case TTM_PL_TT:
> +               sgt = drm_prime_pages_to_sg(bo->tbo.ttm->pages,
> +                                           bo->tbo.num_pages);
> +               if (IS_ERR(sgt))
> +                       return sgt;
> +
> +               if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
> +                                     DMA_ATTR_SKIP_CPU_SYNC)) {
> +                       r = -EINVAL;
> +                       goto error_free;
> +               }
> +               break;
>
> -       if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
> -                             DMA_ATTR_SKIP_CPU_SYNC))
> +       case TTM_PL_VRAM:
> +               r = amdgpu_vram_mgr_alloc_sgt(adev, &bo->tbo.mem, attach->dev,
> +                                             dir, &sgt);
> +               if (r)
> +                       goto error_free;
> +               break;
> +       default:
> +               r = -EINVAL;
>                 goto error_free;
> +       }
>
>         if (attach->dev->driver != adev->dev->driver)
>                 bo->prime_shared_count++;
> @@ -343,7 +366,7 @@ amdgpu_gem_map_dma_buf(struct dma_buf_attachment *attach,
>  error_free:
>         sg_free_table(sgt);
>         kfree(sgt);
> -       return ERR_PTR(-ENOMEM);
> +       return ERR_PTR(r);
>  }
>
>  /**
> @@ -367,10 +390,15 @@ static void amdgpu_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
>         if (attach->dev->driver != adev->dev->driver && bo->prime_shared_count)
>                 bo->prime_shared_count--;
>
> -       if (sgt) {
> +       if (!sgt)
> +               return;
> +
> +       if (sgt->sgl->page_link) {
>                 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
>                 sg_free_table(sgt);
>                 kfree(sgt);
> +       } else {
> +               amdgpu_vram_mgr_free_sgt(adev, attach->dev, dir, sgt);
>         }
>  }
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index c2b7669004ba..0b4cdbe867e7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -72,6 +72,15 @@ uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man);
>  int amdgpu_gtt_mgr_recover(struct ttm_mem_type_manager *man);
>
>  u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo);
> +int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
> +                             struct ttm_mem_reg *mem,
> +                             struct device *dev,
> +                             enum dma_data_direction dir,
> +                             struct sg_table **sgt);
> +void amdgpu_vram_mgr_free_sgt(struct amdgpu_device *adev,
> +                             struct device *dev,
> +                             enum dma_data_direction dir,
> +                             struct sg_table *sgt);
>  uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man);
>  uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man);
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> index ec9ea3fdbb4a..520cea4dbdab 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
> @@ -399,6 +399,102 @@ static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
>         mem->mm_node = NULL;
>  }
>
> +/**
> + * amdgpu_vram_mgr_alloc_sgt - allocate and fill a sg table
> + *
> + * @adev: amdgpu device pointer
> + * @mem: TTM memory object
> + * @dev: the other device
> + * @dir: dma direction
> + * @sgt: resulting sg table
> + *
> + * Allocate and fill a sg table from a VRAM allocation.
> + */
> +int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
> +                             struct ttm_mem_reg *mem,
> +                             struct device *dev,
> +                             enum dma_data_direction dir,
> +                             struct sg_table **sgt)
> +{
> +       struct drm_mm_node *node;
> +       struct scatterlist *sg;
> +       int num_entries = 0;
> +       unsigned int pages;
> +       int i, r;
> +
> +       *sgt = kmalloc(sizeof(*sg), GFP_KERNEL);
> +       if (!*sgt)
> +               return -ENOMEM;
> +
> +       for (pages = mem->num_pages, node = mem->mm_node;
> +            pages; pages -= node->size, ++node)
> +               ++num_entries;
> +
> +       r = sg_alloc_table(*sgt, num_entries, GFP_KERNEL);
> +       if (r)
> +               goto error_free;
> +
> +       for_each_sg((*sgt)->sgl, sg, num_entries, i)
> +               sg->length = 0;
> +
> +       node = mem->mm_node;
> +       for_each_sg((*sgt)->sgl, sg, num_entries, i) {
> +               phys_addr_t phys = (node->start << PAGE_SHIFT) +
> +                       adev->gmc.aper_base;
> +               size_t size = node->size << PAGE_SHIFT;
> +               dma_addr_t addr;
> +
> +               ++node;
> +               addr = dma_map_resource(dev, phys, size, dir,
> +                                       DMA_ATTR_SKIP_CPU_SYNC);
> +               r = dma_mapping_error(dev, addr);
> +               if (r)
> +                       goto error_unmap;
> +
> +               sg_set_dma_addr(sg, addr, size, 0);
> +       }
> +       return 0;
> +
> +error_unmap:
> +       for_each_sg((*sgt)->sgl, sg, num_entries, i) {
> +               if (!sg->length)
> +                       continue;
> +
> +               dma_unmap_resource(dev, sg->dma_address,
> +                                  sg->length, dir,
> +                                  DMA_ATTR_SKIP_CPU_SYNC);
> +       }
> +       sg_free_table(*sgt);
> +
> +error_free:
> +       kfree(*sgt);
> +       return r;
> +}
> +
> +/**
> + * amdgpu_vram_mgr_alloc_sgt - allocate and fill a sg table
> + *
> + * @adev: amdgpu device pointer
> + * @sgt: sg table to free
> + *
> + * Free a previously allocate sg table.
> + */
> +void amdgpu_vram_mgr_free_sgt(struct amdgpu_device *adev,
> +                             struct device *dev,
> +                             enum dma_data_direction dir,
> +                             struct sg_table *sgt)
> +{
> +       struct scatterlist *sg;
> +       int i;
> +
> +       for_each_sg(sgt->sgl, sg, sgt->nents, i)
> +               dma_unmap_resource(dev, sg->dma_address,
> +                                  sg->length, dir,
> +                                  DMA_ATTR_SKIP_CPU_SYNC);
> +       sg_free_table(sgt);
> +       kfree(sgt);
> +}
> +
>  /**
>   * amdgpu_vram_mgr_usage - how many bytes are used in this domain
>   *
> --
> 2.17.1
>
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