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, 11 insertions, 11 deletions

diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 027cd87c3d0d..565957264875 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -3,7 +3,7 @@
 config DRM_ARCPGU
 	tristate "ARC PGU"
 	depends on DRM && OF
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_KMS_HELPER
 	help
 	  Choose this option if you have an ARC PGU controller.
@@ -55,7 +55,7 @@ config DRM_PANEL_MIPI_DBI
 	tristate "DRM support for MIPI DBI compatible panels"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_MIPI_DBI
 	select BACKLIGHT_CLASS_DEVICE
 	select VIDEOMODE_HELPERS
@@ -87,7 +87,7 @@ config TINYDRM_HX8357D
 	tristate "DRM support for HX8357D display panels"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_MIPI_DBI
 	select BACKLIGHT_CLASS_DEVICE
 	help
@@ -100,7 +100,7 @@ config TINYDRM_ILI9163
 	tristate "DRM support for ILI9163 display panels"
 	depends on DRM && SPI
 	select BACKLIGHT_CLASS_DEVICE
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DBI
 	help
@@ -113,7 +113,7 @@ config TINYDRM_ILI9225
 	tristate "DRM support for ILI9225 display panels"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_MIPI_DBI
 	help
 	  DRM driver for the following Ilitek ILI9225 panels:
@@ -125,7 +125,7 @@ config TINYDRM_ILI9341
 	tristate "DRM support for ILI9341 display panels"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_MIPI_DBI
 	select BACKLIGHT_CLASS_DEVICE
 	help
@@ -138,7 +138,7 @@ config TINYDRM_ILI9486
 	tristate "DRM support for ILI9486 display panels"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_MIPI_DBI
 	select BACKLIGHT_CLASS_DEVICE
 	help
@@ -152,7 +152,7 @@ config TINYDRM_MI0283QT
 	tristate "DRM support for MI0283QT"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_MIPI_DBI
 	select BACKLIGHT_CLASS_DEVICE
 	help
@@ -163,7 +163,7 @@ config TINYDRM_REPAPER
 	tristate "DRM support for Pervasive Displays RePaper panels (V231)"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	help
 	  DRM driver for the following Pervasive Displays panels:
 	  1.44" TFT EPD Panel (E1144CS021)
@@ -177,7 +177,7 @@ config TINYDRM_ST7586
 	tristate "DRM support for Sitronix ST7586 display panels"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_MIPI_DBI
 	help
 	  DRM driver for the following Sitronix ST7586 panels:
@@ -189,7 +189,7 @@ config TINYDRM_ST7735R
 	tristate "DRM support for Sitronix ST7715R/ST7735R display panels"
 	depends on DRM && SPI
 	select DRM_KMS_HELPER
-	select DRM_GEM_CMA_HELPER
+	select DRM_GEM_DMA_HELPER
 	select DRM_MIPI_DBI
 	select BACKLIGHT_CLASS_DEVICE
 	help