drm/gem: rename GEM CMA helpers to GEM DMA helpers

Rename "GEM CMA" helpers to "GEM DMA" helpers - considering the
hierarchy of APIs (mm/cma -> dma -> gem dma) calling them "GEM
DMA" seems to be more applicable.

Besides that, commit e57924d4ae80 ("drm/doc: Task to rename CMA helpers")
requests to rename the CMA helpers and implies that people seem to be
confused about the naming.

In order to do this renaming the following script was used:

```
	#!/bin/bash

	DIRS="drivers/gpu include/drm Documentation/gpu"

	REGEX_SYM_UPPER="[0-9A-Z_\-]"
	REGEX_SYM_LOWER="[0-9a-z_\-]"

	REGEX_GREP_UPPER="(${REGEX_SYM_UPPER}*)(GEM)_CMA_(${REGEX_SYM_UPPER}*)"
	REGEX_GREP_LOWER="(${REGEX_SYM_LOWER}*)(gem)_cma_(${REGEX_SYM_LOWER}*)"

	REGEX_SED_UPPER="s/${REGEX_GREP_UPPER}/\1\2_DMA_\3/g"
	REGEX_SED_LOWER="s/${REGEX_GREP_LOWER}/\1\2_dma_\3/g"

	# Find all upper case 'CMA' symbols and replace them with 'DMA'.
	for ff in $(grep -REHl "${REGEX_GREP_UPPER}" $DIRS)
	do
	       sed -i -E "$REGEX_SED_UPPER" $ff
	done

	# Find all lower case 'cma' symbols and replace them with 'dma'.
	for ff in $(grep -REHl "${REGEX_GREP_LOWER}" $DIRS)
	do
	       sed -i -E "$REGEX_SED_LOWER" $ff
	done

	# Replace all occurrences of 'CMA' / 'cma' in comments and
	# documentation files with 'DMA' / 'dma'.
	for ff in $(grep -RiHl " cma " $DIRS)
	do
		sed -i -E "s/ cma / dma /g" $ff
		sed -i -E "s/ CMA / DMA /g" $ff
	done

	# Rename all 'cma_obj's to 'dma_obj'.
	for ff in $(grep -RiHl "cma_obj" $DIRS)
	do
		sed -i -E "s/cma_obj/dma_obj/g" $ff
	done
```

Only a few more manual modifications were needed, e.g. reverting the
following modifications in some DRM Kconfig files

    -       select CMA if HAVE_DMA_CONTIGUOUS
    +       select DMA if HAVE_DMA_CONTIGUOUS

as well as manually picking the occurrences of 'CMA'/'cma' in comments and
documentation which relate to "GEM CMA", but not "FB CMA".

Also drivers/gpu/drm/Makefile was fixed up manually after renaming
drm_gem_cma_helper.c to drm_gem_dma_helper.c.

This patch is compile-time tested building a x86_64 kernel with
`make allyesconfig && make drivers/gpu/drm`.

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> #drivers/gpu/drm/arm
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220802000405.949236-4-dakr@redhat.com

1 files changed, 10 insertions, 10 deletions

diff --git a/drivers/gpu/drm/drm_fb_dma_helper.c b/drivers/gpu/drm/drm_fb_dma_helper.c
index 85fd21cd9dda..b601073c22de 100644
--- a/drivers/gpu/drm/drm_fb_dma_helper.c
+++ b/drivers/gpu/drm/drm_fb_dma_helper.c
@@ -13,7 +13,7 @@
 #include <drm/drm_fb_dma_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_framebuffer.h>
-#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_dma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_plane.h>
 #include <linux/dma-mapping.h>
@@ -35,15 +35,15 @@
  */
 
 /**
- * drm_fb_dma_get_gem_obj() - Get CMA GEM object for framebuffer
+ * drm_fb_dma_get_gem_obj() - Get DMA GEM object for framebuffer
  * @fb: The framebuffer
  * @plane: Which plane
  *
- * Return the CMA GEM object for given framebuffer.
+ * Return the DMA GEM object for given framebuffer.
  *
  * This function will usually be called from the CRTC callback functions.
  */
-struct drm_gem_cma_object *drm_fb_dma_get_gem_obj(struct drm_framebuffer *fb,
+struct drm_gem_dma_object *drm_fb_dma_get_gem_obj(struct drm_framebuffer *fb,
 						  unsigned int plane)
 {
 	struct drm_gem_object *gem;
@@ -52,7 +52,7 @@ struct drm_gem_cma_object *drm_fb_dma_get_gem_obj(struct drm_framebuffer *fb,
 	if (!gem)
 		return NULL;
 
-	return to_drm_gem_cma_obj(gem);
+	return to_drm_gem_dma_obj(gem);
 }
 EXPORT_SYMBOL_GPL(drm_fb_dma_get_gem_obj);
 
@@ -71,7 +71,7 @@ dma_addr_t drm_fb_dma_get_gem_addr(struct drm_framebuffer *fb,
 				   struct drm_plane_state *state,
 				   unsigned int plane)
 {
-	struct drm_gem_cma_object *obj;
+	struct drm_gem_dma_object *obj;
 	dma_addr_t paddr;
 	u8 h_div = 1, v_div = 1;
 	u32 block_w = drm_format_info_block_width(fb->format, plane);
@@ -113,7 +113,7 @@ EXPORT_SYMBOL_GPL(drm_fb_dma_get_gem_addr);
  * @state: New plane state
  *
  * This function can be used by drivers that use damage clips and have
- * CMA GEM objects backed by non-coherent memory. Calling this function
+ * DMA GEM objects backed by non-coherent memory. Calling this function
  * in a plane's .atomic_update ensures that all the data in the backing
  * memory have been written to RAM.
  */
@@ -123,15 +123,15 @@ void drm_fb_dma_sync_non_coherent(struct drm_device *drm,
 {
 	const struct drm_format_info *finfo = state->fb->format;
 	struct drm_atomic_helper_damage_iter iter;
-	const struct drm_gem_cma_object *cma_obj;
+	const struct drm_gem_dma_object *dma_obj;
 	unsigned int offset, i;
 	struct drm_rect clip;
 	dma_addr_t daddr;
 	size_t nb_bytes;
 
 	for (i = 0; i < finfo->num_planes; i++) {
-		cma_obj = drm_fb_dma_get_gem_obj(state->fb, i);
-		if (!cma_obj->map_noncoherent)
+		dma_obj = drm_fb_dma_get_gem_obj(state->fb, i);
+		if (!dma_obj->map_noncoherent)
 			continue;
 
 		daddr = drm_fb_dma_get_gem_addr(state->fb, state, i);