Re: [v2,11/12] drm/fbdev-generic: Implement dedicated fbdev I/O helpers

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Hi,

On 2023/5/17 15:07, Thomas Zimmermann wrote:
Hi

Am 17.05.23 um 03:58 schrieb Sui Jingfeng:
Hi, Thomas


After apply your patch set, the kernel with arch/loongarch/configs/loongson3_defconfig

can not finish compile anymore.  gcc complains:


   AR      drivers/gpu/built-in.a
   AR      drivers/built-in.a
   AR      built-in.a
   AR      vmlinux.a
   LD      vmlinux.o
   OBJCOPY modules.builtin.modinfo
   GEN     modules.builtin
   GEN     .vmlinux.objs
   MODPOST Module.symvers
ERROR: modpost: "fb_sys_write" [drivers/gpu/drm/drm_kms_helper.ko] undefined! ERROR: modpost: "sys_imageblit" [drivers/gpu/drm/drm_kms_helper.ko] undefined! ERROR: modpost: "sys_fillrect" [drivers/gpu/drm/drm_kms_helper.ko] undefined! ERROR: modpost: "sys_copyarea" [drivers/gpu/drm/drm_kms_helper.ko] undefined! ERROR: modpost: "fb_sys_read" [drivers/gpu/drm/drm_kms_helper.ko] undefined!
make[1]: *** [scripts/Makefile.modpost:136: Module.symvers] Error 1
make: *** [Makefile:1978: modpost] Error 2

Thanks for reporting this problem. I found that it's caused by a typo in the very first patch 1/7, where these helpers are not selected correctly. Will be fixed in the next round.

Yeah, this is just a typo.

Should replace 'FB_SYS_HELPER' with 'FB_SYS_HELPERS' on the first patch of this series.


Best regards
Thomas



On 2023/5/15 17:40, Thomas Zimmermann wrote:
Implement dedicated fbdev helpers for framebuffer I/O instead
of using DRM's helpers. Fbdev-generic was the only caller of the
DRM helpers, so remove them from the helper module.

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 |  47 ++++++++++--
  include/drm/drm_fb_helper.h         |  41 -----------
  4 files changed, 43 insertions(+), 158 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

Here, select FB_SYS_HELPERS helps resolve the above issue mentioned.

But select FB_SYS_HELPERS here is more better, I think.  Because it show the nature that

DRM_KMS_HELPER is depend on FB_SYS_HELPERS, I think you may want isolate

those dependency with DRM_FBDEV_EMULATION guard.

at least, you should guarantee that drm itself could built and run standalone.

Fbdev emulation is a client of drm, not reverse.


By the way, does Denial happy about this,

maybe, he want the fbdev emulation 100% made in drm?

      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 8724e08c518b..ba0a808f14ee 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -729,113 +729,6 @@ 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..f53fc49e34a4 100644
--- a/drivers/gpu/drm/drm_fbdev_generic.c
+++ b/drivers/gpu/drm/drm_fbdev_generic.c
@@ -34,6 +34,43 @@ static int drm_fbdev_generic_fb_release(struct fb_info *info, int user)
      return 0;
  }
+static ssize_t drm_fbdev_generic_fb_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;
+
+    ret = fb_sys_write(info, buf, count, ppos);
+    if (ret > 0)
+        drm_fb_helper_damage_range(helper, pos, ret);
+    return ret;
+}
+
+static void drm_fbdev_generic_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
+{
+    struct drm_fb_helper *helper = info->par;
+
+    sys_fillrect(info, rect);
+    drm_fb_helper_damage(helper, rect->dx, rect->dy, rect->width, rect->height);
+}
+
+static void drm_fbdev_generic_fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
+{
+    struct drm_fb_helper *helper = info->par;
+
+    sys_copyarea(info, area);
+    drm_fb_helper_damage(helper, area->dx, area->dy, area->width, area->height);
+}
+
+static void drm_fbdev_generic_fb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+    struct drm_fb_helper *helper = info->par;
+
+    sys_imageblit(info, image);
+    drm_fb_helper_damage(helper, image->dx, image->dy, image->width, image->height);
+}
+
  static void drm_fbdev_generic_fb_destroy(struct fb_info *info)
  {
      struct drm_fb_helper *fb_helper = info->par;
@@ -56,12 +93,12 @@ 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_read    = fb_sys_read,
+    .fb_write    = drm_fbdev_generic_fb_write,
      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_fillrect    = drm_fbdev_generic_fb_fillrect,
+    .fb_copyarea    = drm_fbdev_generic_fb_copyarea,
+    .fb_imageblit    = drm_fbdev_generic_fb_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 80c402f4e379..e3240d749a43 100644
--- a/include/drm/drm_fb_helper.h
+++ b/include/drm/drm_fb_helper.h
@@ -259,18 +259,6 @@ void drm_fb_helper_damage_range(struct drm_fb_helper *helper, off_t off, size_t   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, @@ -398,35 +386,6 @@ 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)
  {




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