drm/ttm: nuke ttm_tt_set_(un)populated again

Neither page allocation backend nor the driver should mess with that.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Madhav Chauhan <madhav.chauhan@amd.com>
Link: https://patchwork.freedesktop.org/patch/396948/

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -1363,7 +1363,6 @@ static int amdgpu_ttm_tt_populate(struct ttm_bo_device *bdev,
 			return -ENOMEM;
 
 		ttm->page_flags |= TTM_PAGE_FLAG_SG;
-		ttm_tt_set_populated(ttm);
 		return 0;
 	}
 
@@ -1383,7 +1382,6 @@ static int amdgpu_ttm_tt_populate(struct ttm_bo_device *bdev,
 		drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
 						 gtt->ttm.dma_address,
 						 ttm->num_pages);
-		ttm_tt_set_populated(ttm);
 		return 0;
 	}
 

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -1321,7 +1321,6 @@ nouveau_ttm_tt_populate(struct ttm_bo_device *bdev,
 		/* make userspace faulting work */
 		drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
 						 ttm_dma->dma_address, ttm->num_pages);
-		ttm_tt_set_populated(ttm);
 		return 0;
 	}
 

drivers/gpu/drm/radeon/radeon_ttm.c

@@ -670,14 +670,12 @@ static int radeon_ttm_tt_populate(struct ttm_bo_device *bdev,
 			return -ENOMEM;
 
 		ttm->page_flags |= TTM_PAGE_FLAG_SG;
-		ttm_tt_set_populated(ttm);
 		return 0;
 	}
 
 	if (slave && ttm->sg) {
 		drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
 						 gtt->ttm.dma_address, ttm->num_pages);
-		ttm_tt_set_populated(ttm);
 		return 0;
 	}
 

drivers/gpu/drm/ttm/ttm_page_alloc.c

@@ -1041,7 +1041,6 @@ ttm_pool_unpopulate_helper(struct ttm_tt *ttm, unsigned mem_count_update)
 put_pages:
 	ttm_put_pages(ttm->pages, ttm->num_pages, ttm->page_flags,
 		      ttm->caching);
-	ttm_tt_set_unpopulated(ttm);
 }
 
 int ttm_pool_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
@@ -1080,7 +1079,6 @@ int ttm_pool_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
 		}
 	}
 
-	ttm_tt_set_populated(ttm);
 	return 0;
 }
 EXPORT_SYMBOL(ttm_pool_populate);

drivers/gpu/drm/ttm/ttm_page_alloc_dma.c

@@ -983,7 +983,6 @@ int ttm_dma_populate(struct ttm_dma_tt *ttm_dma, struct device *dev,
 		}
 	}
 
-	ttm_tt_set_populated(ttm);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(ttm_dma_populate);
@@ -1077,7 +1076,6 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
 	/* shrink pool if necessary (only on !is_cached pools)*/
 	if (npages)
 		ttm_dma_page_pool_free(pool, npages, false);
-	ttm_tt_set_unpopulated(ttm);
 }
 EXPORT_SYMBOL_GPL(ttm_dma_unpopulate);
 

drivers/gpu/drm/ttm/ttm_tt.c

@@ -138,7 +138,6 @@ static void ttm_tt_init_fields(struct ttm_tt *ttm,
 	ttm->num_pages = bo->num_pages;
 	ttm->caching = ttm_cached;
 	ttm->page_flags = page_flags;
-	ttm_tt_set_unpopulated(ttm);
 	ttm->swap_storage = NULL;
 	ttm->sg = bo->sg;
 	ttm->caching = caching;
@@ -334,9 +333,12 @@ int ttm_tt_populate(struct ttm_bo_device *bdev,
 		ret = bdev->driver->ttm_tt_populate(bdev, ttm, ctx);
 	else
 		ret = ttm_pool_populate(ttm, ctx);
-	if (!ret)
-		ttm_tt_add_mapping(bdev, ttm);
-	return ret;
+	if (ret)
+		return ret;
+
+	ttm_tt_add_mapping(bdev, ttm);
+	ttm->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED;
+	return 0;
 }
 EXPORT_SYMBOL(ttm_tt_populate);
 
@@ -365,4 +367,5 @@ void ttm_tt_unpopulate(struct ttm_bo_device *bdev,
 		bdev->driver->ttm_tt_unpopulate(bdev, ttm);
 	else
 		ttm_pool_unpopulate(ttm);
+	ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED;
 }

include/drm/ttm/ttm_tt.h

@@ -72,16 +72,6 @@ static inline bool ttm_tt_is_populated(struct ttm_tt *tt)
 	return tt->page_flags & TTM_PAGE_FLAG_PRIV_POPULATED;
 }
 
-static inline void ttm_tt_set_unpopulated(struct ttm_tt *tt)
-{
-	tt->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED;
-}
-
-static inline void ttm_tt_set_populated(struct ttm_tt *tt)
-{
-	tt->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED;
-}
-
 /**
  * struct ttm_dma_tt
  *