[PATCH 01/10] fbdev: Add fb_ops init macros for framebuffers in DMA-able memory

Thomas Zimmermann
2023-07-04T16:01:40Z

Add initializer macros for struct fb_ops for framebuffers in DMA-able
memory areas. Also add a corresponding Kconfig token. As of now, this
is equivalent to system framebuffers and mostly useful for labeling
drivers correctly.

A later patch may add a generic DMA-specific mmap operation. Linux
offers a number of dma_mmap_*() helpers for different use cases.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Helge Deller <deller@gmx.de>
---
drivers/video/fbdev/Kconfig | 8 ++++++++
include/linux/fb.h | 13 +++++++++++++
2 files changed, 21 insertions(+)

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index cecf15418632..f14229757311 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -168,6 +168,14 @@ config FB_DEFERRED_IO
bool
depends on FB

+config FB_DMA_HELPERS
+ bool
+ depends on FB
+ select FB_SYS_COPYAREA
+ select FB_SYS_FILLRECT
+ select FB_SYS_FOPS
+ select FB_SYS_IMAGEBLIT
+
config FB_IO_HELPERS
bool
depends on FB
diff --git a/include/linux/fb.h b/include/linux/fb.h
index 1d5c13f34b09..1191a78c5289 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -594,6 +594,19 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
__FB_DEFAULT_SYS_OPS_DRAW, \
__FB_DEFAULT_SYS_OPS_MMAP

+/*
+ * Helpers for framebuffers in DMA-able memory
+ */
+
+#define __FB_DEFAULT_DMA_OPS_RDWR \
+ .fb_read = fb_sys_read, \
+ .fb_write = fb_sys_write
+
+#define __FB_DEFAULT_DMA_OPS_DRAW \
+ .fb_fillrect = sys_fillrect, \
+ .fb_copyarea = sys_copyarea, \
+ .fb_imageblit = sys_imageblit
+
/* drivers/video/fbmem.c */
extern int register_framebuffer(struct fb_info *fb_info);
extern void unregister_framebuffer(struct fb_info *fb_info);
--
2.41.0