| Message ID | 20230524092150.11776-14-tzimmermann@suse.de |
|---|---|
| State | Superseded |
| Headers | show |
| Series | drm/fbdev: Remove DRM's helpers for fbdev I/O | expand |
Hi, On 2023/5/30 03:36, Sam Ravnborg wrote: > Hi Thomas, > > On Wed, May 24, 2023 at 11:21:50AM +0200, 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 fbdev callbacks. i915 was the only >> caller of the DRM helpers, so remove them from the helper module. >> >> i915's fbdev emulation is still incomplete as it doesn't implement >> deferred I/O and damage handling for mmaped pages. >> >> v4: >> * generate deferred-I/O helpers >> * use initializer macros for fb_ops >> v2: >> * use FB_IO_HELPERS options >> >> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> >> Cc: Jani Nikula <jani.nikula@linux.intel.com> >> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> >> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> >> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> >> Cc: "Ville Syrjälä" <ville.syrjala@linux.intel.com> >> --- >> drivers/gpu/drm/Kconfig | 3 - >> drivers/gpu/drm/drm_fb_helper.c | 107 --------------------- >> drivers/gpu/drm/i915/Kconfig | 1 + >> drivers/gpu/drm/i915/display/intel_fbdev.c | 14 +-- >> include/drm/drm_fb_helper.h | 39 -------- >> 5 files changed, 9 insertions(+), 155 deletions(-) >> >> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig >> index 92a782827b7b..bb2e48cc6cd6 100644 >> --- a/drivers/gpu/drm/Kconfig >> +++ b/drivers/gpu/drm/Kconfig >> @@ -133,9 +133,6 @@ config DRM_FBDEV_EMULATION >> bool "Enable legacy fbdev support for your modesetting driver" >> depends on DRM_KMS_HELPER >> depends on FB=y || FB=DRM_KMS_HELPER >> - select FB_CFB_FILLRECT >> - select FB_CFB_COPYAREA >> - select FB_CFB_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 bab6b252f02a..9978147bbc8a 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_cfb_read - Implements struct &fb_ops.fb_read for I/O 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_cfb_read(struct fb_info *info, char __user *buf, >> - size_t count, loff_t *ppos) >> -{ >> - return fb_io_read(info, buf, count, ppos); >> -} >> -EXPORT_SYMBOL(drm_fb_helper_cfb_read); >> - >> -/** >> - * drm_fb_helper_cfb_write - Implements struct &fb_ops.fb_write for I/O 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_cfb_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_io_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)); >> - } > The generated helpers do not have the if (helper->funcs->fb_dirty) > check. Nice catch! If I understand this correctly, fb_io_write() will write directly to the ultimate destination. There no need to check if (helper->funcs->fb_dirty) anymore. code inside the curly brace of `if (helper->funcs->fb_dirty) { }` can be delete safely . This could turn out to be an optimization. This is a benefit of untangled implement. previously this is a generic (tangled) implement, which intended to be used by both the UMA device driver and non-UMA device(with dedicate VRAM) driver. drm_fbdev_generic always has a shadow screen buffer allocated in system RAM, it always has the fb_dirty hooked, so this could be an optimization for fbdev_generic by eliminate if (helper->funcs->fb_dirty) check. while dma helper based driver could switch to drm_fbdev_dma, they writing to gem buffer directly, no shadow buffer is needed. With those patch, device driver with dedicated video memory can also choose FB_CFB_* to update (iomem)framebuffer directly, despite slower. > Is this implemented somewhere else that I missed? > > Sam > drm_fb_helper_fb_dirty() function has a check: ``` if (drm_WARN_ON_ONCE(dev, !helper->funcs->fb_dirty)) return; ``` Not sure if this is a little bit too late...... >> - >> - return ret; >> -} >> -EXPORT_SYMBOL(drm_fb_helper_cfb_write); >> - >> -/** >> - * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect >> - * @info: fbdev registered by the helper >> - * @rect: info about rectangle to fill >> - * >> - * A wrapper around cfb_fillrect implemented by fbdev core >> - */ >> -void drm_fb_helper_cfb_fillrect(struct fb_info *info, >> - const struct fb_fillrect *rect) >> -{ >> - struct drm_fb_helper *helper = info->par; >> - >> - cfb_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_cfb_fillrect); >> - >> -/** >> - * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea >> - * @info: fbdev registered by the helper >> - * @area: info about area to copy >> - * >> - * A wrapper around cfb_copyarea implemented by fbdev core >> - */ >> -void drm_fb_helper_cfb_copyarea(struct fb_info *info, >> - const struct fb_copyarea *area) >> -{ >> - struct drm_fb_helper *helper = info->par; >> - >> - cfb_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_cfb_copyarea); >> - >> -/** >> - * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit >> - * @info: fbdev registered by the helper >> - * @image: info about image to blit >> - * >> - * A wrapper around cfb_imageblit implemented by fbdev core >> - */ >> -void drm_fb_helper_cfb_imageblit(struct fb_info *info, >> - const struct fb_image *image) >> -{ >> - struct drm_fb_helper *helper = info->par; >> - >> - cfb_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_cfb_imageblit); >> - >> /** >> * drm_fb_helper_set_suspend - wrapper around fb_set_suspend >> * @fb_helper: driver-allocated fbdev helper, can be NULL >> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig >> index e4f4d2e3fdfe..01b5a8272a27 100644 >> --- a/drivers/gpu/drm/i915/Kconfig >> +++ b/drivers/gpu/drm/i915/Kconfig >> @@ -17,6 +17,7 @@ config DRM_I915 >> select DRM_KMS_HELPER >> select DRM_PANEL >> select DRM_MIPI_DSI >> + select FB_IO_HELPERS if DRM_FBDEV_EMULATION >> select RELAY >> select I2C >> select I2C_ALGOBIT >> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c >> index aab1ae74a8f7..eccaceaf8b9d 100644 >> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c >> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c >> @@ -28,6 +28,7 @@ >> #include <linux/console.h> >> #include <linux/delay.h> >> #include <linux/errno.h> >> +#include <linux/fb.h> >> #include <linux/init.h> >> #include <linux/kernel.h> >> #include <linux/mm.h> >> @@ -84,6 +85,10 @@ static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev) >> intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU); >> } >> >> +FB_GEN_DEFAULT_DEFERRED_IO_OPS(intel_fbdev, >> + drm_fb_helper_damage_range, >> + drm_fb_helper_damage_area) >> + >> static int intel_fbdev_set_par(struct fb_info *info) >> { >> struct intel_fbdev *ifbdev = to_intel_fbdev(info->par); >> @@ -132,15 +137,12 @@ static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) >> >> static const struct fb_ops intelfb_ops = { >> .owner = THIS_MODULE, >> + __FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev), >> DRM_FB_HELPER_DEFAULT_OPS, >> .fb_set_par = intel_fbdev_set_par, >> - .fb_read = drm_fb_helper_cfb_read, >> - .fb_write = drm_fb_helper_cfb_write, >> - .fb_fillrect = drm_fb_helper_cfb_fillrect, >> - .fb_copyarea = drm_fb_helper_cfb_copyarea, >> - .fb_imageblit = drm_fb_helper_cfb_imageblit, >> - .fb_pan_display = intel_fbdev_pan_display, >> .fb_blank = intel_fbdev_blank, >> + .fb_pan_display = intel_fbdev_pan_display, >> + __FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev), >> .fb_mmap = intel_fbdev_mmap, >> }; >> >> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h >> index b50fd0c0b713..4863b0f8299e 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_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, >> - size_t count, loff_t *ppos); >> - >> -void drm_fb_helper_cfb_fillrect(struct fb_info *info, >> - const struct fb_fillrect *rect); >> -void drm_fb_helper_cfb_copyarea(struct fb_info *info, >> - const struct fb_copyarea *area); >> -void drm_fb_helper_cfb_imageblit(struct fb_info *info, >> - const struct fb_image *image); >> - >> void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend); >> void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, >> bool suspend); >> @@ -385,33 +373,6 @@ static inline int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper) >> return -ENODEV; >> } >> >> -static inline ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf, >> - size_t count, loff_t *ppos) >> -{ >> - return -ENODEV; >> -} >> - >> -static inline ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf, >> - size_t count, loff_t *ppos) >> -{ >> - return -ENODEV; >> -} >> - >> -static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info, >> - const struct fb_fillrect *rect) >> -{ >> -} >> - >> -static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info, >> - const struct fb_copyarea *area) >> -{ >> -} >> - >> -static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info, >> - const struct fb_image *image) >> -{ >> -} >> - >> static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, >> bool suspend) >> { >> -- >> 2.40.1 > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Hi Am 29.05.23 um 21:36 schrieb Sam Ravnborg: > Hi Thomas, > > On Wed, May 24, 2023 at 11:21:50AM +0200, 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 fbdev callbacks. i915 was the only >> caller of the DRM helpers, so remove them from the helper module. >> >> i915's fbdev emulation is still incomplete as it doesn't implement >> deferred I/O and damage handling for mmaped pages. >> >> v4: >> * generate deferred-I/O helpers >> * use initializer macros for fb_ops >> v2: >> * use FB_IO_HELPERS options >> >> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> >> Cc: Jani Nikula <jani.nikula@linux.intel.com> >> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> >> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> >> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> >> Cc: "Ville Syrjälä" <ville.syrjala@linux.intel.com> >> --- >> drivers/gpu/drm/Kconfig | 3 - >> drivers/gpu/drm/drm_fb_helper.c | 107 --------------------- >> drivers/gpu/drm/i915/Kconfig | 1 + >> drivers/gpu/drm/i915/display/intel_fbdev.c | 14 +-- >> include/drm/drm_fb_helper.h | 39 -------- >> 5 files changed, 9 insertions(+), 155 deletions(-) >> >> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig >> index 92a782827b7b..bb2e48cc6cd6 100644 >> --- a/drivers/gpu/drm/Kconfig >> +++ b/drivers/gpu/drm/Kconfig >> @@ -133,9 +133,6 @@ config DRM_FBDEV_EMULATION >> bool "Enable legacy fbdev support for your modesetting driver" >> depends on DRM_KMS_HELPER >> depends on FB=y || FB=DRM_KMS_HELPER >> - select FB_CFB_FILLRECT >> - select FB_CFB_COPYAREA >> - select FB_CFB_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 bab6b252f02a..9978147bbc8a 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_cfb_read - Implements struct &fb_ops.fb_read for I/O 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_cfb_read(struct fb_info *info, char __user *buf, >> - size_t count, loff_t *ppos) >> -{ >> - return fb_io_read(info, buf, count, ppos); >> -} >> -EXPORT_SYMBOL(drm_fb_helper_cfb_read); >> - >> -/** >> - * drm_fb_helper_cfb_write - Implements struct &fb_ops.fb_write for I/O 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_cfb_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_io_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)); >> - } > > The generated helpers do not have the if (helper->funcs->fb_dirty) > check. > Is this implemented somewhere else that I missed? It's not needed any longer. We used to test if the fbdev code needs damage handling by looking for a fb_dirty callback. If so, we ran the damage handling code. With the patchset applied, the fbdev code that does not need damage handling calls fb_{io,sys}_write() directly. The fbdev code that needs damage handling (generic, i915, msm) uses the generator macro that creates necessary the calls unconditionally. We know each case at build time. (I think I have to move the msm patch after patch 10/13 to make it bisectable.) AFAICT the missing test for fb_dirty is also one of the reasons why there's a difference in performance. Hopefully, this answers your question? Best regards Thomas > > Sam > > >> - >> - return ret; >> -} >> -EXPORT_SYMBOL(drm_fb_helper_cfb_write); >> - >> -/** >> - * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect >> - * @info: fbdev registered by the helper >> - * @rect: info about rectangle to fill >> - * >> - * A wrapper around cfb_fillrect implemented by fbdev core >> - */ >> -void drm_fb_helper_cfb_fillrect(struct fb_info *info, >> - const struct fb_fillrect *rect) >> -{ >> - struct drm_fb_helper *helper = info->par; >> - >> - cfb_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_cfb_fillrect); >> - >> -/** >> - * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea >> - * @info: fbdev registered by the helper >> - * @area: info about area to copy >> - * >> - * A wrapper around cfb_copyarea implemented by fbdev core >> - */ >> -void drm_fb_helper_cfb_copyarea(struct fb_info *info, >> - const struct fb_copyarea *area) >> -{ >> - struct drm_fb_helper *helper = info->par; >> - >> - cfb_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_cfb_copyarea); >> - >> -/** >> - * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit >> - * @info: fbdev registered by the helper >> - * @image: info about image to blit >> - * >> - * A wrapper around cfb_imageblit implemented by fbdev core >> - */ >> -void drm_fb_helper_cfb_imageblit(struct fb_info *info, >> - const struct fb_image *image) >> -{ >> - struct drm_fb_helper *helper = info->par; >> - >> - cfb_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_cfb_imageblit); >> - >> /** >> * drm_fb_helper_set_suspend - wrapper around fb_set_suspend >> * @fb_helper: driver-allocated fbdev helper, can be NULL >> diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig >> index e4f4d2e3fdfe..01b5a8272a27 100644 >> --- a/drivers/gpu/drm/i915/Kconfig >> +++ b/drivers/gpu/drm/i915/Kconfig >> @@ -17,6 +17,7 @@ config DRM_I915 >> select DRM_KMS_HELPER >> select DRM_PANEL >> select DRM_MIPI_DSI >> + select FB_IO_HELPERS if DRM_FBDEV_EMULATION >> select RELAY >> select I2C >> select I2C_ALGOBIT >> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c >> index aab1ae74a8f7..eccaceaf8b9d 100644 >> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c >> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c >> @@ -28,6 +28,7 @@ >> #include <linux/console.h> >> #include <linux/delay.h> >> #include <linux/errno.h> >> +#include <linux/fb.h> >> #include <linux/init.h> >> #include <linux/kernel.h> >> #include <linux/mm.h> >> @@ -84,6 +85,10 @@ static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev) >> intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU); >> } >> >> +FB_GEN_DEFAULT_DEFERRED_IO_OPS(intel_fbdev, >> + drm_fb_helper_damage_range, >> + drm_fb_helper_damage_area) >> + >> static int intel_fbdev_set_par(struct fb_info *info) >> { >> struct intel_fbdev *ifbdev = to_intel_fbdev(info->par); >> @@ -132,15 +137,12 @@ static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) >> >> static const struct fb_ops intelfb_ops = { >> .owner = THIS_MODULE, >> + __FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev), >> DRM_FB_HELPER_DEFAULT_OPS, >> .fb_set_par = intel_fbdev_set_par, >> - .fb_read = drm_fb_helper_cfb_read, >> - .fb_write = drm_fb_helper_cfb_write, >> - .fb_fillrect = drm_fb_helper_cfb_fillrect, >> - .fb_copyarea = drm_fb_helper_cfb_copyarea, >> - .fb_imageblit = drm_fb_helper_cfb_imageblit, >> - .fb_pan_display = intel_fbdev_pan_display, >> .fb_blank = intel_fbdev_blank, >> + .fb_pan_display = intel_fbdev_pan_display, >> + __FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev), >> .fb_mmap = intel_fbdev_mmap, >> }; >> >> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h >> index b50fd0c0b713..4863b0f8299e 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_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, >> - size_t count, loff_t *ppos); >> - >> -void drm_fb_helper_cfb_fillrect(struct fb_info *info, >> - const struct fb_fillrect *rect); >> -void drm_fb_helper_cfb_copyarea(struct fb_info *info, >> - const struct fb_copyarea *area); >> -void drm_fb_helper_cfb_imageblit(struct fb_info *info, >> - const struct fb_image *image); >> - >> void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend); >> void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, >> bool suspend); >> @@ -385,33 +373,6 @@ static inline int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper) >> return -ENODEV; >> } >> >> -static inline ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf, >> - size_t count, loff_t *ppos) >> -{ >> - return -ENODEV; >> -} >> - >> -static inline ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf, >> - size_t count, loff_t *ppos) >> -{ >> - return -ENODEV; >> -} >> - >> -static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info, >> - const struct fb_fillrect *rect) >> -{ >> -} >> - >> -static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info, >> - const struct fb_copyarea *area) >> -{ >> -} >> - >> -static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info, >> - const struct fb_image *image) >> -{ >> -} >> - >> static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, >> bool suspend) >> { >> -- >> 2.40.1
Hi Thomas, > > > - 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)); > > > - } > > > > The generated helpers do not have the if (helper->funcs->fb_dirty) > > check. > > Is this implemented somewhere else that I missed? > > It's not needed any longer. We used to test if the fbdev code needs damage > handling by looking for a fb_dirty callback. If so, we ran the damage > handling code. > > With the patchset applied, the fbdev code that does not need damage handling > calls fb_{io,sys}_write() directly. The fbdev code that needs damage > handling (generic, i915, msm) uses the generator macro that creates > necessary the calls unconditionally. We know each case at build time. > > (I think I have to move the msm patch after patch 10/13 to make it > bisectable.) > > AFAICT the missing test for fb_dirty is also one of the reasons why there's > a difference in performance. > > Hopefully, this answers your question? Makes perfect sense - thanks. That also implies that my conditional r-b's are now OK. Sam
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 92a782827b7b..bb2e48cc6cd6 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -133,9 +133,6 @@ config DRM_FBDEV_EMULATION bool "Enable legacy fbdev support for your modesetting driver" depends on DRM_KMS_HELPER depends on FB=y || FB=DRM_KMS_HELPER - select FB_CFB_FILLRECT - select FB_CFB_COPYAREA - select FB_CFB_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 bab6b252f02a..9978147bbc8a 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_cfb_read - Implements struct &fb_ops.fb_read for I/O 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_cfb_read(struct fb_info *info, char __user *buf, - size_t count, loff_t *ppos) -{ - return fb_io_read(info, buf, count, ppos); -} -EXPORT_SYMBOL(drm_fb_helper_cfb_read); - -/** - * drm_fb_helper_cfb_write - Implements struct &fb_ops.fb_write for I/O 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_cfb_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_io_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_cfb_write); - -/** - * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect - * @info: fbdev registered by the helper - * @rect: info about rectangle to fill - * - * A wrapper around cfb_fillrect implemented by fbdev core - */ -void drm_fb_helper_cfb_fillrect(struct fb_info *info, - const struct fb_fillrect *rect) -{ - struct drm_fb_helper *helper = info->par; - - cfb_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_cfb_fillrect); - -/** - * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea - * @info: fbdev registered by the helper - * @area: info about area to copy - * - * A wrapper around cfb_copyarea implemented by fbdev core - */ -void drm_fb_helper_cfb_copyarea(struct fb_info *info, - const struct fb_copyarea *area) -{ - struct drm_fb_helper *helper = info->par; - - cfb_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_cfb_copyarea); - -/** - * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit - * @info: fbdev registered by the helper - * @image: info about image to blit - * - * A wrapper around cfb_imageblit implemented by fbdev core - */ -void drm_fb_helper_cfb_imageblit(struct fb_info *info, - const struct fb_image *image) -{ - struct drm_fb_helper *helper = info->par; - - cfb_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_cfb_imageblit); - /** * drm_fb_helper_set_suspend - wrapper around fb_set_suspend * @fb_helper: driver-allocated fbdev helper, can be NULL diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig index e4f4d2e3fdfe..01b5a8272a27 100644 --- a/drivers/gpu/drm/i915/Kconfig +++ b/drivers/gpu/drm/i915/Kconfig @@ -17,6 +17,7 @@ config DRM_I915 select DRM_KMS_HELPER select DRM_PANEL select DRM_MIPI_DSI + select FB_IO_HELPERS if DRM_FBDEV_EMULATION select RELAY select I2C select I2C_ALGOBIT diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c index aab1ae74a8f7..eccaceaf8b9d 100644 --- a/drivers/gpu/drm/i915/display/intel_fbdev.c +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c @@ -28,6 +28,7 @@ #include <linux/console.h> #include <linux/delay.h> #include <linux/errno.h> +#include <linux/fb.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/mm.h> @@ -84,6 +85,10 @@ static void intel_fbdev_invalidate(struct intel_fbdev *ifbdev) intel_frontbuffer_invalidate(to_frontbuffer(ifbdev), ORIGIN_CPU); } +FB_GEN_DEFAULT_DEFERRED_IO_OPS(intel_fbdev, + drm_fb_helper_damage_range, + drm_fb_helper_damage_area) + static int intel_fbdev_set_par(struct fb_info *info) { struct intel_fbdev *ifbdev = to_intel_fbdev(info->par); @@ -132,15 +137,12 @@ static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma) static const struct fb_ops intelfb_ops = { .owner = THIS_MODULE, + __FB_DEFAULT_DEFERRED_OPS_RDWR(intel_fbdev), DRM_FB_HELPER_DEFAULT_OPS, .fb_set_par = intel_fbdev_set_par, - .fb_read = drm_fb_helper_cfb_read, - .fb_write = drm_fb_helper_cfb_write, - .fb_fillrect = drm_fb_helper_cfb_fillrect, - .fb_copyarea = drm_fb_helper_cfb_copyarea, - .fb_imageblit = drm_fb_helper_cfb_imageblit, - .fb_pan_display = intel_fbdev_pan_display, .fb_blank = intel_fbdev_blank, + .fb_pan_display = intel_fbdev_pan_display, + __FB_DEFAULT_DEFERRED_OPS_DRAW(intel_fbdev), .fb_mmap = intel_fbdev_mmap, }; diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h index b50fd0c0b713..4863b0f8299e 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_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, - size_t count, loff_t *ppos); - -void drm_fb_helper_cfb_fillrect(struct fb_info *info, - const struct fb_fillrect *rect); -void drm_fb_helper_cfb_copyarea(struct fb_info *info, - const struct fb_copyarea *area); -void drm_fb_helper_cfb_imageblit(struct fb_info *info, - const struct fb_image *image); - void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend); void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend); @@ -385,33 +373,6 @@ static inline int drm_fb_helper_defio_init(struct drm_fb_helper *fb_helper) return -ENODEV; } -static inline ssize_t drm_fb_helper_cfb_read(struct fb_info *info, char __user *buf, - size_t count, loff_t *ppos) -{ - return -ENODEV; -} - -static inline ssize_t drm_fb_helper_cfb_write(struct fb_info *info, const char __user *buf, - size_t count, loff_t *ppos) -{ - return -ENODEV; -} - -static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info, - const struct fb_fillrect *rect) -{ -} - -static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info, - const struct fb_copyarea *area) -{ -} - -static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info, - const struct fb_image *image) -{ -} - static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend) {
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 fbdev callbacks. i915 was the only caller of the DRM helpers, so remove them from the helper module. i915's fbdev emulation is still incomplete as it doesn't implement deferred I/O and damage handling for mmaped pages. v4: * generate deferred-I/O helpers * use initializer macros for fb_ops v2: * use FB_IO_HELPERS options Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Cc: "Ville Syrjälä" <ville.syrjala@linux.intel.com> --- drivers/gpu/drm/Kconfig | 3 - drivers/gpu/drm/drm_fb_helper.c | 107 --------------------- drivers/gpu/drm/i915/Kconfig | 1 + drivers/gpu/drm/i915/display/intel_fbdev.c | 14 +-- include/drm/drm_fb_helper.h | 39 -------- 5 files changed, 9 insertions(+), 155 deletions(-)