drm/cma-helper: Export dedicated wrappers for GEM object functions

Wrap GEM CMA functions for struct drm_gem_object_funcs and update
all callers. This will allow for an update of the public interfaces
of the GEM CMA helper library.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20211115120148.21766-3-tzimmermann@suse.de

drivers/gpu/drm/drm_gem_cma_helper.c

@@ -35,11 +35,11 @@
  */
 
 static const struct drm_gem_object_funcs drm_gem_cma_default_funcs = {
-	.free = drm_gem_cma_free_object,
-	.print_info = drm_gem_cma_print_info,
-	.get_sg_table = drm_gem_cma_get_sg_table,
-	.vmap = drm_gem_cma_vmap,
-	.mmap = drm_gem_cma_mmap,
+	.free = drm_gem_cma_object_free,
+	.print_info = drm_gem_cma_object_print_info,
+	.get_sg_table = drm_gem_cma_object_get_sg_table,
+	.vmap = drm_gem_cma_object_vmap,
+	.mmap = drm_gem_cma_object_mmap,
 	.vm_ops = &drm_gem_cma_vm_ops,
 };
 
@@ -198,8 +198,6 @@ drm_gem_cma_create_with_handle(struct drm_file *file_priv,
  * This function frees the backing memory of the CMA GEM object, cleans up the
  * GEM object state and frees the memory used to store the object itself.
  * If the buffer is imported and the virtual address is set, it is released.
- * Drivers using the CMA helpers should set this as their
- * &drm_gem_object_funcs.free callback.
  */
 void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
 {
@@ -388,9 +386,8 @@ EXPORT_SYMBOL(drm_gem_cma_print_info);
  *     pages for a CMA GEM object
  * @obj: GEM object
  *
- * This function exports a scatter/gather table by
- * calling the standard DMA mapping API. Drivers using the CMA helpers should
- * set this as their &drm_gem_object_funcs.get_sg_table callback.
+ * This function exports a scatter/gather table by calling the standard
+ * DMA mapping API.
  *
  * Returns:
  * A pointer to the scatter/gather table of pinned pages or NULL on failure.
@@ -470,8 +467,7 @@ EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
  * This function maps a buffer into the kernel's
  * virtual address space. Since the CMA buffers are already mapped into the
  * kernel virtual address space this simply returns the cached virtual
- * address. Drivers using the CMA helpers should set this as their DRM
- * driver's &drm_gem_object_funcs.vmap callback.
+ * address.
  *
  * Returns:
  * 0 on success, or a negative error code otherwise.
@@ -493,8 +489,7 @@ EXPORT_SYMBOL_GPL(drm_gem_cma_vmap);
  *
  * This function maps a buffer into a userspace process's address space.
  * In addition to the usual GEM VMA setup it immediately faults in the entire
- * object instead of using on-demand faulting. Drivers that use the CMA
- * helpers should set this as their &drm_gem_object_funcs.mmap callback.
+ * object instead of using on-demand faulting.
  *
  * Returns:
  * 0 on success or a negative error code on failure.

drivers/gpu/drm/rcar-du/rcar_du_kms.c

@@ -327,11 +327,11 @@ const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
  */
 
 static const struct drm_gem_object_funcs rcar_du_gem_funcs = {
-	.free = drm_gem_cma_free_object,
-	.print_info = drm_gem_cma_print_info,
-	.get_sg_table = drm_gem_cma_get_sg_table,
-	.vmap = drm_gem_cma_vmap,
-	.mmap = drm_gem_cma_mmap,
+	.free = drm_gem_cma_object_free,
+	.print_info = drm_gem_cma_object_print_info,
+	.get_sg_table = drm_gem_cma_object_get_sg_table,
+	.vmap = drm_gem_cma_object_vmap,
+	.mmap = drm_gem_cma_object_mmap,
 	.vm_ops = &drm_gem_cma_vm_ops,
 };
 

drivers/gpu/drm/vc4/vc4_bo.c

@@ -732,8 +732,8 @@ static const struct vm_operations_struct vc4_vm_ops = {
 static const struct drm_gem_object_funcs vc4_gem_object_funcs = {
 	.free = vc4_free_object,
 	.export = vc4_prime_export,
-	.get_sg_table = drm_gem_cma_get_sg_table,
-	.vmap = drm_gem_cma_vmap,
+	.get_sg_table = drm_gem_cma_object_get_sg_table,
+	.vmap = drm_gem_cma_object_vmap,
 	.mmap = vc4_gem_object_mmap,
 	.vm_ops = &vc4_vm_ops,
 };

include/drm/drm_gem_cma_helper.h

@@ -48,6 +48,84 @@ struct sg_table *drm_gem_cma_get_sg_table(struct drm_gem_object *obj);
 int drm_gem_cma_vmap(struct drm_gem_object *obj, struct dma_buf_map *map);
 int drm_gem_cma_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
 
+/*
+ * GEM object functions
+ */
+
+/**
+ * drm_gem_cma_object_free - GEM object function for drm_gem_cma_free_object()
+ * @obj: GEM object to free
+ *
+ * This function wraps drm_gem_cma_free_object(). Drivers that employ the CMA helpers
+ * should use it as their &drm_gem_object_funcs.free handler.
+ */
+static inline void drm_gem_cma_object_free(struct drm_gem_object *obj)
+{
+	drm_gem_cma_free_object(obj);
+}
+
+/**
+ * drm_gem_cma_object_print_info() - Print &drm_gem_cma_object info for debugfs
+ * @p: DRM printer
+ * @indent: Tab indentation level
+ * @obj: GEM object
+ *
+ * This function wraps drm_gem_cma_print_info(). Drivers that employ the CMA helpers
+ * should use this function as their &drm_gem_object_funcs.print_info handler.
+ */
+static inline void drm_gem_cma_object_print_info(struct drm_printer *p, unsigned int indent,
+						 const struct drm_gem_object *obj)
+{
+	drm_gem_cma_print_info(p, indent, obj);
+}
+
+/**
+ * drm_gem_cma_object_get_sg_table - GEM object function for drm_gem_cma_get_sg_table()
+ * @obj: GEM object
+ *
+ * This function wraps drm_gem_cma_get_sg_table(). Drivers that employ the CMA helpers should
+ * use it as their &drm_gem_object_funcs.get_sg_table handler.
+ *
+ * Returns:
+ * A pointer to the scatter/gather table of pinned pages or NULL on failure.
+ */
+static inline struct sg_table *drm_gem_cma_object_get_sg_table(struct drm_gem_object *obj)
+{
+	return drm_gem_cma_get_sg_table(obj);
+}
+
+/*
+ * drm_gem_cma_object_vmap - GEM object function for drm_gem_cma_vmap()
+ * @obj: GEM object
+ * @map: Returns the kernel virtual address of the CMA GEM object's backing store.
+ *
+ * This function wraps drm_gem_cma_vmap(). Drivers that employ the CMA helpers should
+ * use it as their &drm_gem_object_funcs.vmap handler.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+static inline int drm_gem_cma_object_vmap(struct drm_gem_object *obj, struct dma_buf_map *map)
+{
+	return drm_gem_cma_vmap(obj, map);
+}
+
+/**
+ * drm_gem_cma_object_mmap - GEM object function for drm_gem_cma_mmap()
+ * @obj: GEM object
+ * @vma: VMA for the area to be mapped
+ *
+ * This function wraps drm_gem_cma_mmap(). Drivers that employ the cma helpers should
+ * use it as their &drm_gem_object_funcs.mmap handler.
+ *
+ * Returns:
+ * 0 on success or a negative error code on failure.
+ */
+static inline int drm_gem_cma_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
+{
+	return drm_gem_cma_mmap(obj, vma);
+}
+
 /*
  * Driver ops
  */