Re: [PATCH 3/3] drm/ttm: Change the meaning of the fields in the drm_mm_nodes structure from pfn to bytes v2

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On Tue, 14 Feb 2023 at 07:43, Christian König
<ckoenig.leichtzumerken@xxxxxxxxx> wrote:
>
> From: Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx>
>
> Change the ttm_range_man_alloc() allocation from pages to size in bytes.
> Fix the dependent drm_mm_nodes start and size from pages to bytes.
>
> v2 (chk): Change the drm_mm_node usage in amdgpu as well. re-order the
>           patch to be independent of the resource->start change.
>
> Signed-off-by: Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx>
> Reviewed-by: Christian König <christian.koenig@xxxxxxx>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c    | 15 ++++++++-------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h |  8 ++++----
>  drivers/gpu/drm/i915/i915_scatterlist.c        |  6 +++---
>  drivers/gpu/drm/ttm/ttm_range_manager.c        | 17 ++++++++---------
>  4 files changed, 23 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> index 44367f03316f..c90423cd1292 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> @@ -116,7 +116,6 @@ static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
>                               struct ttm_resource **res)
>  {
>         struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man);
> -       uint32_t num_pages = PFN_UP(tbo->base.size);
>         struct ttm_range_mgr_node *node;
>         int r;
>
> @@ -134,17 +133,19 @@ static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
>         if (place->lpfn) {
>                 spin_lock(&mgr->lock);
>                 r = drm_mm_insert_node_in_range(&mgr->mm, &node->mm_nodes[0],
> -                                               num_pages, tbo->page_alignment,
> -                                               0, place->fpfn, place->lpfn,
> +                                               tbo->base.size,
> +                                               tbo->page_alignment << PAGE_SHIFT, 0,
> +                                               place->fpfn << PAGE_SHIFT,
> +                                               place->lpfn << PAGE_SHIFT,
>                                                 DRM_MM_INSERT_BEST);
>                 spin_unlock(&mgr->lock);
>                 if (unlikely(r))
>                         goto err_free;
>
> -               node->base.start = node->mm_nodes[0].start;
> +               node->base.start = node->mm_nodes[0].start >> PAGE_SHIFT;
>         } else {
>                 node->mm_nodes[0].start = 0;
> -               node->mm_nodes[0].size = PFN_UP(node->base.size);
> +               node->mm_nodes[0].size = node->base.size;
>                 node->base.start = AMDGPU_BO_INVALID_OFFSET;
>         }
>
> @@ -285,8 +286,8 @@ int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size)
>
>         ttm_resource_manager_init(man, &adev->mman.bdev, gtt_size);
>
> -       start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
> -       size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
> +       start = (AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS) << PAGE_SHIFT;
> +       size = adev->gmc.gart_size - start;
>         drm_mm_init(&mgr->mm, start, size);
>         spin_lock_init(&mgr->lock);
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> index 5c4f93ee0c57..5c78f0b09351 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
> @@ -94,8 +94,8 @@ static inline void amdgpu_res_first(struct ttm_resource *res,
>                 while (start >= node->size << PAGE_SHIFT)
>                         start -= node++->size << PAGE_SHIFT;
>
> -               cur->start = (node->start << PAGE_SHIFT) + start;
> -               cur->size = min((node->size << PAGE_SHIFT) - start, size);
> +               cur->start = node->start + start;
> +               cur->size = min(node->size - start, size);
>                 cur->remaining = size;
>                 cur->node = node;
>                 break;
> @@ -155,8 +155,8 @@ static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size)
>                 node = cur->node;
>
>                 cur->node = ++node;
> -               cur->start = node->start << PAGE_SHIFT;
> -               cur->size = min(node->size << PAGE_SHIFT, cur->remaining);
> +               cur->start = node->start;
> +               cur->size = min(node->size, cur->remaining);
>                 break;
>         default:
>                 return;
> diff --git a/drivers/gpu/drm/i915/i915_scatterlist.c b/drivers/gpu/drm/i915/i915_scatterlist.c
> index 756289e43dff..7defda1219d0 100644
> --- a/drivers/gpu/drm/i915/i915_scatterlist.c
> +++ b/drivers/gpu/drm/i915/i915_scatterlist.c
> @@ -94,7 +94,7 @@ struct i915_refct_sgt *i915_rsgt_from_mm_node(const struct drm_mm_node *node,
>         if (!rsgt)
>                 return ERR_PTR(-ENOMEM);
>
> -       i915_refct_sgt_init(rsgt, node->size << PAGE_SHIFT);
> +       i915_refct_sgt_init(rsgt, node->size);
>         st = &rsgt->table;
>         /* restricted by sg_alloc_table */
>         if (WARN_ON(overflows_type(DIV_ROUND_UP_ULL(node->size, segment_pages),
> @@ -110,8 +110,8 @@ struct i915_refct_sgt *i915_rsgt_from_mm_node(const struct drm_mm_node *node,
>         sg = st->sgl;
>         st->nents = 0;
>         prev_end = (resource_size_t)-1;
> -       block_size = node->size << PAGE_SHIFT;
> -       offset = node->start << PAGE_SHIFT;
> +       block_size = node->size;
> +       offset = node->start;
>
>         while (block_size) {
>                 u64 len;
> diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c
> index 62fddcc59f02..9da6054f2955 100644
> --- a/drivers/gpu/drm/ttm/ttm_range_manager.c
> +++ b/drivers/gpu/drm/ttm/ttm_range_manager.c
> @@ -83,9 +83,10 @@ static int ttm_range_man_alloc(struct ttm_resource_manager *man,
>
>         spin_lock(&rman->lock);
>         ret = drm_mm_insert_node_in_range(mm, &node->mm_nodes[0],
> -                                         PFN_UP(node->base.size),
> -                                         bo->page_alignment, 0,
> -                                         place->fpfn, lpfn, mode);
> +                                         node->base.size,
> +                                         bo->page_alignment << PAGE_SHIFT, 0,
> +                                         place->fpfn << PAGE_SHIFT,

place->fpfn is only u32. I assume we need some (u64) cast or so?

> +                                         lpfn << PAGE_SHIFT, mode);
>         spin_unlock(&rman->lock);
>
>         if (unlikely(ret)) {
> @@ -94,7 +95,7 @@ static int ttm_range_man_alloc(struct ttm_resource_manager *man,
>                 return ret;
>         }
>
> -       node->base.start = node->mm_nodes[0].start;
> +       node->base.start = node->mm_nodes[0].start >> PAGE_SHIFT;
>         *res = &node->base;
>         return 0;
>  }
> @@ -119,11 +120,10 @@ static bool ttm_range_man_intersects(struct ttm_resource_manager *man,
>                                      size_t size)
>  {
>         struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
> -       u32 num_pages = PFN_UP(size);
>
>         /* Don't evict BOs outside of the requested placement range */
> -       if (place->fpfn >= (node->start + num_pages) ||
> -           (place->lpfn && place->lpfn <= node->start))
> +       if ((place->fpfn << PAGE_SHIFT) >= (node->start + size) ||
> +           (place->lpfn && (place->lpfn << PAGE_SHIFT) <= node->start))

Same here.

>                 return false;
>
>         return true;
> @@ -135,10 +135,9 @@ static bool ttm_range_man_compatible(struct ttm_resource_manager *man,
>                                      size_t size)
>  {
>         struct drm_mm_node *node = &to_ttm_range_mgr_node(res)->mm_nodes[0];
> -       u32 num_pages = PFN_UP(size);
>
>         if (node->start < place->fpfn ||
> -           (place->lpfn && (node->start + num_pages) > place->lpfn))
> +           (place->lpfn && (node->start + size) > place->lpfn << PAGE_SHIFT))

And here.

>                 return false;
>
>         return true;
> --
> 2.34.1
>




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