Hi Am 24.05.23 um 22:23 schrieb Sui Jingfeng:
Tested-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>This version works fine, I have tested it On LoongArch with drm/loongson(v14) as it is most handy for me.Also because it using fbdev-generic. fbdev of IGT report no error. Then I run fbtest from geert[1],Before apply your patch: Benchmarking... 10x10 squares: 468.39 Mpixels/s Benchmarking... 20x20 squares: 985.02 Mpixels/s Benchmarking... 50x50 squares: 2247.22 Mpixels/s Benchmarking... 100x100 squares: 2242.30 Mpixels/s Benchmarking... 200x200 squares: 2883.18 Mpixels/s Benchmarking... 500x500 squares: 3642.18 Mpixels/s Benchmarking... 1000x1000 squares: 3992.77 Mpixels/s Benchmarking... R5 circles: 261.90 Mpixels/s Benchmarking... R10 circles: 596.27 Mpixels/s Benchmarking... R25 circles: 1513.96 Mpixels/s Benchmarking... R50 circles: 1965.07 Mpixels/s Benchmarking... R100 circles: 2470.75 Mpixels/s Benchmarking... R250 circles: 3288.00 Mpixels/s Benchmarking... R500 circles: 3705.66 Mpixels/s After apply your patch: Benchmarking... 10x10 squares: 477.04 Mpixels/s Benchmarking... 20x20 squares: 1021.07 Mpixels/s Benchmarking... 50x50 squares: 2315.70 Mpixels/s Benchmarking... 100x100 squares: 2267.69 Mpixels/s Benchmarking... 200x200 squares: 3006.28 Mpixels/s Benchmarking... 500x500 squares: 3761.44 Mpixels/s Benchmarking... 1000x1000 squares: 4112.49 Mpixels/s Benchmarking... R5 circles: 269.19 Mpixels/s Benchmarking... R10 circles: 620.77 Mpixels/s Benchmarking... R25 circles: 1559.02 Mpixels/s Benchmarking... R50 circles: 2027.36 Mpixels/s Benchmarking... R100 circles: 2574.42 Mpixels/s Benchmarking... R250 circles: 3363.28 Mpixels/s Benchmarking... R500 circles: 3815.51 Mpixels/s It seems that this bring a little bit performance gain.
Thanks for testing. I can't really tell why the code is now faster. All the patch really does is to eliminate an intermediate cross-module function call and the pointer derefs. This, apparently, already has an impact.
Best regards Thomas
Directly operate on video RAM is slower than have a shadow in system RAM.I also test this patch in intel i3-8100 @ 3.6Ghz, the results show that i915 is a bit slower.Because it operate directly on device memory. [1] https://git.kernel.org/pub/scm/linux/kernel/git/geert/fbtest.git On 2023/5/24 17:21, Thomas Zimmermann wrote: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@xxxxxxx> --- 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 ydiff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.cindex cb03099fd2e3..bab6b252f02a 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 pointerdiff --git a/drivers/gpu/drm/drm_fbdev_generic.c b/drivers/gpu/drm/drm_fbdev_generic.cindex 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) {
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)
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