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, 7 insertions, 7 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index f85788401707..2def6e2ad6f0 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -823,9 +823,9 @@ static void vc4_async_page_flip_seqno_complete(struct vc4_seqno_cb *cb)
 	struct vc4_bo *bo = NULL;
 
 	if (flip_state->old_fb) {
-		struct drm_gem_cma_object *cma_bo =
+		struct drm_gem_dma_object *dma_bo =
 			drm_fb_dma_get_gem_obj(flip_state->old_fb, 0);
-		bo = to_vc4_bo(&cma_bo->base);
+		bo = to_vc4_bo(&dma_bo->base);
 	}
 
 	vc4_async_page_flip_complete(flip_state);
@@ -857,19 +857,19 @@ static int vc4_async_set_fence_cb(struct drm_device *dev,
 				  struct vc4_async_flip_state *flip_state)
 {
 	struct drm_framebuffer *fb = flip_state->fb;
-	struct drm_gem_cma_object *cma_bo = drm_fb_dma_get_gem_obj(fb, 0);
+	struct drm_gem_dma_object *dma_bo = drm_fb_dma_get_gem_obj(fb, 0);
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct dma_fence *fence;
 	int ret;
 
 	if (!vc4->is_vc5) {
-		struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
+		struct vc4_bo *bo = to_vc4_bo(&dma_bo->base);
 
 		return vc4_queue_seqno_cb(dev, &flip_state->cb.seqno, bo->seqno,
 					  vc4_async_page_flip_seqno_complete);
 	}
 
-	ret = dma_resv_get_singleton(cma_bo->base.resv, DMA_RESV_USAGE_READ, &fence);
+	ret = dma_resv_get_singleton(dma_bo->base.resv, DMA_RESV_USAGE_READ, &fence);
 	if (ret)
 		return ret;
 
@@ -945,8 +945,8 @@ static int vc4_async_page_flip(struct drm_crtc *crtc,
 {
 	struct drm_device *dev = crtc->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	struct drm_gem_cma_object *cma_bo = drm_fb_dma_get_gem_obj(fb, 0);
-	struct vc4_bo *bo = to_vc4_bo(&cma_bo->base);
+	struct drm_gem_dma_object *dma_bo = drm_fb_dma_get_gem_obj(fb, 0);
+	struct vc4_bo *bo = to_vc4_bo(&dma_bo->base);
 	int ret;
 
 	if (WARN_ON_ONCE(vc4->is_vc5))