Re: [v4,12/13] drm/fbdev-generic: Implement dedicated fbdev I/O helpers

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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 y
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 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 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)
  {

--
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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