Re: [PATCH v4 03/14] drm/ttm: move ttm_tt_{add,clear}_mapping into amdgpu

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Am 21.09.21 um 13:01 schrieb Matthew Auld:
Now that setting page->index shouldn't be needed anymore, we are just
left with setting page->mapping, and here it looks like amdgpu is the
only user, where pointing the page->mapping at the dev_mapping is used
to verify that the pages do indeed belong to the device, if userspace
later tries to touch them.

v2(Christian):
   - Drop the functions altogether and just inline modifying
     the page->mapping

Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

---
  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 15 ++++++++++++++-
  drivers/gpu/drm/ttm/ttm_tt.c            | 25 -------------------------
  2 files changed, 14 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 820fcb24231f..438377a89aa3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1119,6 +1119,8 @@ static int amdgpu_ttm_tt_populate(struct ttm_device *bdev,
  {
  	struct amdgpu_device *adev = amdgpu_ttm_adev(bdev);
  	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+	pgoff_t i;
+	int ret;
/* user pages are bound by amdgpu_ttm_tt_pin_userptr() */
  	if (gtt->userptr) {
@@ -1131,7 +1133,14 @@ static int amdgpu_ttm_tt_populate(struct ttm_device *bdev,
  	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
  		return 0;
- return ttm_pool_alloc(&adev->mman.bdev.pool, ttm, ctx);
+	ret = ttm_pool_alloc(&adev->mman.bdev.pool, ttm, ctx);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < ttm->num_pages; ++i)
+		ttm->pages[i]->mapping = bdev->dev_mapping;
+
+	return 0;
  }
/*
@@ -1145,6 +1154,7 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev,
  {
  	struct amdgpu_ttm_tt *gtt = (void *)ttm;
  	struct amdgpu_device *adev;
+	pgoff_t i;
amdgpu_ttm_backend_unbind(bdev, ttm); @@ -1158,6 +1168,9 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev,
  	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
  		return;
+ for (i = 0; i < ttm->num_pages; ++i)
+		ttm->pages[i]->mapping = NULL;
+
  	adev = amdgpu_ttm_adev(bdev);
  	return ttm_pool_free(&adev->mman.bdev.pool, ttm);
  }
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 1cc04c224988..980ecb079b2c 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -289,17 +289,6 @@ int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
  	return ret;
  }
-static void ttm_tt_add_mapping(struct ttm_device *bdev, struct ttm_tt *ttm)
-{
-	pgoff_t i;
-
-	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
-		return;
-
-	for (i = 0; i < ttm->num_pages; ++i)
-		ttm->pages[i]->mapping = bdev->dev_mapping;
-}
-
  int ttm_tt_populate(struct ttm_device *bdev,
  		    struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
  {
@@ -336,7 +325,6 @@ int ttm_tt_populate(struct ttm_device *bdev,
  	if (ret)
  		goto error;
- ttm_tt_add_mapping(bdev, ttm);
  	ttm->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED;
  	if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
  		ret = ttm_tt_swapin(ttm);
@@ -359,24 +347,11 @@ int ttm_tt_populate(struct ttm_device *bdev,
  }
  EXPORT_SYMBOL(ttm_tt_populate);
-static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
-{
-	pgoff_t i;
-	struct page **page = ttm->pages;
-
-	if (ttm->page_flags & TTM_PAGE_FLAG_SG)
-		return;
-
-	for (i = 0; i < ttm->num_pages; ++i)
-		(*page)->mapping = NULL;
-}
-
  void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
  {
  	if (!ttm_tt_is_populated(ttm))
  		return;
- ttm_tt_clear_mapping(ttm);
  	if (bdev->funcs->ttm_tt_unpopulate)
  		bdev->funcs->ttm_tt_unpopulate(bdev, ttm);
  	else




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