Re: [PATCH v1] drm/ttm: Clean up page shift operation

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Am 22.11.22 um 08:51 schrieb Somalapuram Amaranath:
Remove page shift operations as ttm_resource moved
from num_pages to size_t size in bytes.
v1 -> v2: fix missing page shift to fpfn and lpfn

Signed-off-by: Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c |  4 +---
  drivers/gpu/drm/ttm/ttm_range_manager.c    | 13 ++++++-------
  2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 974e85d8b6cc..19ad365dc159 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -541,12 +541,10 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
  	if (bp->domain & (AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA)) {
  		/* GWS and OA don't need any alignment. */
  		page_align = bp->byte_align;
-		size <<= PAGE_SHIFT;
-
  	} else if (bp->domain & AMDGPU_GEM_DOMAIN_GDS) {
  		/* Both size and alignment must be a multiple of 4. */
  		page_align = ALIGN(bp->byte_align, 4);
-		size = ALIGN(size, 4) << PAGE_SHIFT;
+		size = ALIGN(size, 4);

The amdgpu changes should probably be a separate patch.

  	} else {
  		/* Memory should be aligned at least to a page size. */
  		page_align = ALIGN(bp->byte_align, PAGE_SIZE) >> PAGE_SHIFT;
diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c
index 0a8bc0b7f380..6ac38092dd2a 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),
+					  node->base.size,
  					  bo->page_alignment, 0,
-					  place->fpfn, lpfn, mode);
+					  place->fpfn << PAGE_SHIFT,
+					  lpfn << PAGE_SHIFT, mode);
  	spin_unlock(&rman->lock);
if (unlikely(ret)) {
@@ -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))
  		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))
  		return false;

This looks good but can't be complete. We have a couple of place where node->start and node->size is used outside of TTM.

See drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h and drivers/gpu/drm/i915/intel_region_ttm.c for example.

Those need to be updated as well.

Regards,
Christian.


return true;




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