[Intel-gfx] [PATCH v5 12/13] drm/fbdev-generic: Implement dedicated fbdev I/O helpers

Thomas Zimmermann
2023-05-30T15:03:55Z

Implement dedicated fbdev helpers for framebuffer I/O instead
of using DRM's helpers. Use an fbdev generator macro for
deferred I/O to create the callbacks. Fbdev-generic was the
only caller of the DRM helpers, so remove them from the helper
module.

v4:
* generate deferred-I/O helpers
* use initializer macros for fb_ops
v2:
* use FB_SYS_HELPERS_DEFERRED option

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
---
drivers/gpu/drm/Kconfig | 6 +-
drivers/gpu/drm/drm_fb_helper.c | 107 ----------------------------
drivers/gpu/drm/drm_fbdev_generic.c | 11 ++-
include/drm/drm_fb_helper.h | 41 -----------
4 files changed, 6 insertions(+), 159 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 77fb10ddd8a2..92a782827b7b 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -95,6 +95,7 @@ config DRM_KUNIT_TEST
config DRM_KMS_HELPER
tristate
depends on DRM
+ select FB_SYS_HELPERS_DEFERRED if DRM_FBDEV_EMULATION
help
CRTC helpers for KMS drivers.

@@ -135,11 +136,6 @@ config DRM_FBDEV_EMULATION
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
- select FB_DEFERRED_IO
- select FB_SYS_FOPS
- select FB_SYS_FILLRECT
- select FB_SYS_COPYAREA
- select FB_SYS_IMAGEBLIT
select FRAMEBUFFER_CONSOLE if !EXPERT
select FRAMEBUFFER_CONSOLE_DETECT_PRIMARY if FRAMEBUFFER_CONSOLE
default y
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 7071c810ba83..7f6e54967acb 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -736,113 +736,6 @@ void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagerefli
}
EXPORT_SYMBOL(drm_fb_helper_deferred_io);

-/**
- * drm_fb_helper_sys_read - Implements struct &fb_ops.fb_read for system memory
- * @info: fb_info struct pointer
- * @buf: userspace buffer to read from framebuffer memory
- * @count: number of bytes to read from framebuffer memory
- * @ppos: read offset within framebuffer memory
- *
- * Returns:
- * The number of bytes read on success, or an error code otherwise.
- */
-ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
- size_t count, loff_t *ppos)
-{
- return fb_sys_read(info, buf, count, ppos);
-}
-EXPORT_SYMBOL(drm_fb_helper_sys_read);
-
-/**
- * drm_fb_helper_sys_write - Implements struct &fb_ops.fb_write for system memory
- * @info: fb_info struct pointer
- * @buf: userspace buffer to write to framebuffer memory
- * @count: number of bytes to write to framebuffer memory
- * @ppos: write offset within framebuffer memory
- *
- * Returns:
- * The number of bytes written on success, or an error code otherwise.
- */
-ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct drm_fb_helper *helper = info->par;
- loff_t pos = *ppos;
- ssize_t ret;
- struct drm_rect damage_area;
-
- ret = fb_sys_write(info, buf, count, ppos);
- if (ret <= 0)
- return ret;
-
- if (helper->funcs->fb_dirty) {
- drm_fb_helper_memory_range_to_clip(info, pos, ret, &damage_area);
- drm_fb_helper_damage(helper, damage_area.x1, damage_area.y1,
- drm_rect_width(&damage_area),
- drm_rect_height(&damage_area));
- }
-
- return ret;
-}
-EXPORT_SYMBOL(drm_fb_helper_sys_write);
-
-/**
- * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect
- * @info: fbdev registered by the helper
- * @rect: info about rectangle to fill
- *
- * A wrapper around sys_fillrect implemented by fbdev core
- */
-void drm_fb_helper_sys_fillrect(struct fb_info *info,
- const struct fb_fillrect *rect)
-{
- struct drm_fb_helper *helper = info->par;
-
- sys_fillrect(info, rect);
-
- if (helper->funcs->fb_dirty)
- drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
-}
-EXPORT_SYMBOL(drm_fb_helper_sys_fillrect);
-
-/**
- * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea
- * @info: fbdev registered by the helper
- * @area: info about area to copy
- *
- * A wrapper around sys_copyarea implemented by fbdev core
- */
-void drm_fb_helper_sys_copyarea(struct fb_info *info,
- const struct fb_copyarea *area)
-{
- struct drm_fb_helper *helper = info->par;
-
- sys_copyarea(info, area);
-
- if (helper->funcs->fb_dirty)
- drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
-}
-EXPORT_SYMBOL(drm_fb_helper_sys_copyarea);
-
-/**
- * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit
- * @info: fbdev registered by the helper
- * @image: info about image to blit
- *
- * A wrapper around sys_imageblit implemented by fbdev core
- */
-void drm_fb_helper_sys_imageblit(struct fb_info *info,
- const struct fb_image *image)
-{
- struct drm_fb_helper *helper = info->par;
-
- sys_imageblit(info, image);
-
- if (helper->funcs->fb_dirty)
- drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
-}
-EXPORT_SYMBOL(drm_fb_helper_sys_imageblit);
-
/**
* drm_fb_helper_cfb_read - Implements struct &fb_ops.fb_read for I/O memory
* @info: fb_info struct pointer
diff --git a/drivers/gpu/drm/drm_fbdev_generic.c b/drivers/gpu/drm/drm_fbdev_generic.c
index 8e5148bf40bb..98ae703848a0 100644
--- a/drivers/gpu/drm/drm_fbdev_generic.c
+++ b/drivers/gpu/drm/drm_fbdev_generic.c
@@ -34,6 +34,10 @@ static int drm_fbdev_generic_fb_release(struct fb_info *info, int user)
return 0;
}

+FB_GEN_DEFAULT_DEFERRED_SYS_OPS(drm_fbdev_generic,
+ drm_fb_helper_damage_range,
+ drm_fb_helper_damage_area);
+
static void drm_fbdev_generic_fb_destroy(struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
@@ -56,13 +60,8 @@ static const struct fb_ops drm_fbdev_generic_fb_ops = {
.owner = THIS_MODULE,
.fb_open = drm_fbdev_generic_fb_open,
.fb_release = drm_fbdev_generic_fb_release,
- .fb_read = drm_fb_helper_sys_read,
- .fb_write = drm_fb_helper_sys_write,
+ FB_DEFAULT_DEFERRED_OPS(drm_fbdev_generic),
DRM_FB_HELPER_DEFAULT_OPS,
- .fb_fillrect = drm_fb_helper_sys_fillrect,
- .fb_copyarea = drm_fb_helper_sys_copyarea,
- .fb_imageblit = drm_fb_helper_sys_imageblit,
- .fb_mmap = fb_deferred_io_mmap,
.fb_destroy = drm_fbdev_generic_fb_destroy,
};

diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 7d5804882be7..b50fd0c0b713 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -258,18 +258,6 @@ void drm_fb_helper_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u3

void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist);

-ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
- size_t count, loff_t *ppos);
-ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
- size_t count, loff_t *ppos);
-
-void drm_fb_helper_sys_fillrect(struct fb_info *info,
- const struct fb_fillrect *rect);
-void drm_fb_helper_sys_copyarea(struct fb_info *info,
- const struct fb_copyarea *area);
-void drm_fb_helper_sys_imageblit(struct fb_info *info,
- const struct fb_image *image);
-
ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos);
ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf,
@@ -397,35 +385,6 @@ static inline int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper)
return -ENODEV;
}

-static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
- char __user *buf, size_t count,
- loff_t *ppos)
-{
- return -ENODEV;
-}
-
-static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
- const char __user *buf,
- size_t count, loff_t *ppos)
-{
- return -ENODEV;
-}
-
-static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
- const struct fb_fillrect *rect)
-{
-}
-
-static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
- const struct fb_copyarea *area)
-{
-}
-
-static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
- const struct fb_image *image)
-{
-}
-
static inline ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos)
{
--
2.40.1