| Message ID | 1461780996-8612-4-git-send-email-noralf@tronnes.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Apr 27, 2016 at 08:16:32PM +0200, Noralf Trønnes wrote: > This adds deferred io support to drm_fb_helper. > The fbdev framebuffer changes are flushed using the callback > (struct drm_framebuffer *)->funcs->dirty() by a dedicated worker > ensuring that it always runs in process context. > > Signed-off-by: Noralf Trønnes <noralf@tronnes.org> > --- > > Changes since v2: > - FB_DEFERRED_IO is now always selected by DRM_KMS_FB_HELPER, ifdef removed > - The drm_clip_rect utility functions are dropped, so open code it > - docs: use & to denote structs > > Changes since v1: > - Use a dedicated worker to run the framebuffer flushing like qxl does > - Add parameter descriptions to drm_fb_helper_deferred_io > > drivers/gpu/drm/Kconfig | 1 + > drivers/gpu/drm/drm_fb_helper.c | 109 +++++++++++++++++++++++++++++++++++++++- > include/drm/drm_fb_helper.h | 15 ++++++ > 3 files changed, 124 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig > index 9e4f2f1..8e6f34b 100644 > --- a/drivers/gpu/drm/Kconfig > +++ b/drivers/gpu/drm/Kconfig > @@ -52,6 +52,7 @@ config DRM_KMS_FB_HELPER > select FB_CFB_FILLRECT > select FB_CFB_COPYAREA > select FB_CFB_IMAGEBLIT > + select FB_DEFERRED_IO > help > FBDEV helpers for KMS drivers. > > diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c > index 855108e..5112b5d 100644 > --- a/drivers/gpu/drm/drm_fb_helper.c > +++ b/drivers/gpu/drm/drm_fb_helper.c > @@ -48,6 +48,8 @@ MODULE_PARM_DESC(fbdev_emulation, > > static LIST_HEAD(kernel_fb_helper_list); > > +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper); Instead of this forward decl just inline the few setup commands into drm_fb_helper_prepare. > + > /** > * DOC: fbdev helpers > * > @@ -84,6 +86,15 @@ static LIST_HEAD(kernel_fb_helper_list); > * and set up an initial configuration using the detected hardware, drivers > * should call drm_fb_helper_single_add_all_connectors() followed by > * drm_fb_helper_initial_config(). > + * > + * If CONFIG_FB_DEFERRED_IO is enabled and &drm_framebuffer_funcs ->dirty is > + * set, the drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} > + * functions will accumulate changes and schedule &fb_helper .dirty_work to run > + * right away. This worker then calls the dirty() function ensuring that it > + * will always run in process context since the fb_*() function could be > + * running in atomic context. If drm_fb_helper_deferred_io() is used as the > + * deferred_io callback it will also schedule dirty_work with the damage > + * collected from the mmap page writes. > */ > > /** > @@ -650,6 +661,7 @@ void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, > const struct drm_fb_helper_funcs *funcs) > { > INIT_LIST_HEAD(&helper->kernel_fb_list); > + drm_fb_helper_dirty_init(helper); > helper->funcs = funcs; > helper->dev = dev; > } > @@ -834,6 +846,82 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) > } > EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); > > +static void drm_fb_helper_dirty_work(struct work_struct *work) > +{ > + struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, > + dirty_work); > + struct drm_clip_rect *clip = &helper->dirty_clip; > + struct drm_clip_rect clip_copy; > + unsigned long flags; > + > + spin_lock_irqsave(&helper->dirty_lock, flags); > + clip_copy = *clip; > + clip->x1 = clip->y1 = ~0; > + clip->x2 = clip->y2 = 0; > + spin_unlock_irqrestore(&helper->dirty_lock, flags); > + > + helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); > +} > + > +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper) > +{ > + spin_lock_init(&helper->dirty_lock); > + INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); > + helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0; > +} > + > +static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, > + u32 width, u32 height) > +{ > + struct drm_fb_helper *helper = info->par; > + struct drm_clip_rect *clip = &helper->dirty_clip; > + unsigned long flags; > + > + if (!helper->fb->funcs->dirty) > + return; > + > + spin_lock_irqsave(&helper->dirty_lock, flags); > + clip->x1 = min_t(u32, clip->x1, x); > + clip->y1 = min_t(u32, clip->y1, y); > + clip->x2 = max_t(u32, clip->x2, x + width); > + clip->y2 = max_t(u32, clip->y2, y + height); > + spin_unlock_irqrestore(&helper->dirty_lock, flags); > + > + schedule_work(&helper->dirty_work); > +} > + > +/** > + * drm_fb_helper_deferred_io() - fbdev deferred_io callback function > + * @info: fb_info struct pointer > + * @pagelist: list of dirty mmap framebuffer pages > + * > + * This function is used as the &fb_deferred_io ->deferred_io > + * callback function for flushing the fbdev mmap writes. > + */ > +void drm_fb_helper_deferred_io(struct fb_info *info, > + struct list_head *pagelist) > +{ > + unsigned long start, end, min, max; > + struct page *page; > + u32 y1, y2; > + > + min = ULONG_MAX; > + max = 0; > + list_for_each_entry(page, pagelist, lru) { > + start = page->index << PAGE_SHIFT; > + end = start + PAGE_SIZE - 1; > + min = min(min, start); > + max = max(max, end); > + } > + > + if (min < max) { > + y1 = min / info->fix.line_length; > + y2 = min_t(u32, max / info->fix.line_length, info->var.yres); Needs a DIV_ROUND_UP here I think. Besides these two nits nothing else I've spotted. Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> > + drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); > + } > +} > +EXPORT_SYMBOL(drm_fb_helper_deferred_io); > + > /** > * drm_fb_helper_sys_read - wrapper around fb_sys_read > * @info: fb_info struct pointer > @@ -862,7 +950,14 @@ EXPORT_SYMBOL(drm_fb_helper_sys_read); > ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, > size_t count, loff_t *ppos) > { > - return fb_sys_write(info, buf, count, ppos); > + ssize_t ret; > + > + ret = fb_sys_write(info, buf, count, ppos); > + if (ret > 0) > + drm_fb_helper_dirty(info, 0, 0, info->var.xres, > + info->var.yres); > + > + return ret; > } > EXPORT_SYMBOL(drm_fb_helper_sys_write); > > @@ -877,6 +972,8 @@ void drm_fb_helper_sys_fillrect(struct fb_info *info, > const struct fb_fillrect *rect) > { > sys_fillrect(info, rect); > + drm_fb_helper_dirty(info, rect->dx, rect->dy, > + rect->width, rect->height); > } > EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); > > @@ -891,6 +988,8 @@ void drm_fb_helper_sys_copyarea(struct fb_info *info, > const struct fb_copyarea *area) > { > sys_copyarea(info, area); > + drm_fb_helper_dirty(info, area->dx, area->dy, > + area->width, area->height); > } > EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); > > @@ -905,6 +1004,8 @@ void drm_fb_helper_sys_imageblit(struct fb_info *info, > const struct fb_image *image) > { > sys_imageblit(info, image); > + drm_fb_helper_dirty(info, image->dx, image->dy, > + image->width, image->height); > } > EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); > > @@ -919,6 +1020,8 @@ void drm_fb_helper_cfb_fillrect(struct fb_info *info, > const struct fb_fillrect *rect) > { > cfb_fillrect(info, rect); > + drm_fb_helper_dirty(info, rect->dx, rect->dy, > + rect->width, rect->height); > } > EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); > > @@ -933,6 +1036,8 @@ void drm_fb_helper_cfb_copyarea(struct fb_info *info, > const struct fb_copyarea *area) > { > cfb_copyarea(info, area); > + drm_fb_helper_dirty(info, area->dx, area->dy, > + area->width, area->height); > } > EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); > > @@ -947,6 +1052,8 @@ void drm_fb_helper_cfb_imageblit(struct fb_info *info, > const struct fb_image *image) > { > cfb_imageblit(info, image); > + drm_fb_helper_dirty(info, image->dx, image->dy, > + image->width, image->height); > } > EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); > > diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h > index 062723b..5b4aa35 100644 > --- a/include/drm/drm_fb_helper.h > +++ b/include/drm/drm_fb_helper.h > @@ -172,6 +172,10 @@ struct drm_fb_helper_connector { > * @funcs: driver callbacks for fb helper > * @fbdev: emulated fbdev device info struct > * @pseudo_palette: fake palette of 16 colors > + * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to > + * the screen buffer > + * @dirty_lock: spinlock protecting @dirty_clip > + * @dirty_work: worker used to flush the framebuffer > * > * This is the main structure used by the fbdev helpers. Drivers supporting > * fbdev emulation should embedded this into their overall driver structure. > @@ -189,6 +193,9 @@ struct drm_fb_helper { > const struct drm_fb_helper_funcs *funcs; > struct fb_info *fbdev; > u32 pseudo_palette[17]; > + struct drm_clip_rect dirty_clip; > + spinlock_t dirty_lock; > + struct work_struct dirty_work; > > /** > * @kernel_fb_list: > @@ -245,6 +252,9 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, > > void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper); > > +void drm_fb_helper_deferred_io(struct fb_info *info, > + struct list_head *pagelist); > + > 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, > @@ -368,6 +378,11 @@ static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) > { > } > > +static inline void drm_fb_helper_deferred_io(struct fb_info *info, > + struct list_head *pagelist) > +{ > +} > + > static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info, > char __user *buf, size_t count, > loff_t *ppos) > -- > 2.2.2 >
Den 27.04.2016 21:20, skrev Daniel Vetter: > On Wed, Apr 27, 2016 at 08:16:32PM +0200, Noralf Trønnes wrote: >> This adds deferred io support to drm_fb_helper. >> The fbdev framebuffer changes are flushed using the callback >> (struct drm_framebuffer *)->funcs->dirty() by a dedicated worker >> ensuring that it always runs in process context. >> >> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> >> --- >> >> Changes since v2: >> - FB_DEFERRED_IO is now always selected by DRM_KMS_FB_HELPER, ifdef removed >> - The drm_clip_rect utility functions are dropped, so open code it >> - docs: use & to denote structs >> >> Changes since v1: >> - Use a dedicated worker to run the framebuffer flushing like qxl does >> - Add parameter descriptions to drm_fb_helper_deferred_io >> >> drivers/gpu/drm/Kconfig | 1 + >> drivers/gpu/drm/drm_fb_helper.c | 109 +++++++++++++++++++++++++++++++++++++++- >> include/drm/drm_fb_helper.h | 15 ++++++ >> 3 files changed, 124 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig >> index 9e4f2f1..8e6f34b 100644 >> --- a/drivers/gpu/drm/Kconfig >> +++ b/drivers/gpu/drm/Kconfig >> @@ -52,6 +52,7 @@ config DRM_KMS_FB_HELPER >> select FB_CFB_FILLRECT >> select FB_CFB_COPYAREA >> select FB_CFB_IMAGEBLIT >> + select FB_DEFERRED_IO >> help >> FBDEV helpers for KMS drivers. >> >> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c >> index 855108e..5112b5d 100644 >> --- a/drivers/gpu/drm/drm_fb_helper.c >> +++ b/drivers/gpu/drm/drm_fb_helper.c >> @@ -48,6 +48,8 @@ MODULE_PARM_DESC(fbdev_emulation, >> >> static LIST_HEAD(kernel_fb_helper_list); >> >> +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper); > Instead of this forward decl just inline the few setup commands into > drm_fb_helper_prepare. That would mean that I have to forward declare drm_fb_helper_dirty_work() instead. Is that better? Or should I relocate the functions? >> + >> /** >> * DOC: fbdev helpers >> * >> @@ -84,6 +86,15 @@ static LIST_HEAD(kernel_fb_helper_list); >> * and set up an initial configuration using the detected hardware, drivers >> * should call drm_fb_helper_single_add_all_connectors() followed by >> * drm_fb_helper_initial_config(). >> + * >> + * If CONFIG_FB_DEFERRED_IO is enabled and &drm_framebuffer_funcs ->dirty is >> + * set, the drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} >> + * functions will accumulate changes and schedule &fb_helper .dirty_work to run >> + * right away. This worker then calls the dirty() function ensuring that it >> + * will always run in process context since the fb_*() function could be >> + * running in atomic context. If drm_fb_helper_deferred_io() is used as the >> + * deferred_io callback it will also schedule dirty_work with the damage >> + * collected from the mmap page writes. >> */ >> >> /** >> @@ -650,6 +661,7 @@ void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, >> const struct drm_fb_helper_funcs *funcs) >> { >> INIT_LIST_HEAD(&helper->kernel_fb_list); >> + drm_fb_helper_dirty_init(helper); >> helper->funcs = funcs; >> helper->dev = dev; >> } >> @@ -834,6 +846,82 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) >> } >> EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); >> >> +static void drm_fb_helper_dirty_work(struct work_struct *work) >> +{ >> + struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, >> + dirty_work); >> + struct drm_clip_rect *clip = &helper->dirty_clip; >> + struct drm_clip_rect clip_copy; >> + unsigned long flags; >> + >> + spin_lock_irqsave(&helper->dirty_lock, flags); >> + clip_copy = *clip; >> + clip->x1 = clip->y1 = ~0; >> + clip->x2 = clip->y2 = 0; >> + spin_unlock_irqrestore(&helper->dirty_lock, flags); >> + >> + helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); >> +} >> + >> +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper) >> +{ >> + spin_lock_init(&helper->dirty_lock); >> + INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); >> + helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0; >> +} >> + >> +static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, >> + u32 width, u32 height) >> +{ >> + struct drm_fb_helper *helper = info->par; >> + struct drm_clip_rect *clip = &helper->dirty_clip; >> + unsigned long flags; >> + >> + if (!helper->fb->funcs->dirty) >> + return; >> + >> + spin_lock_irqsave(&helper->dirty_lock, flags); >> + clip->x1 = min_t(u32, clip->x1, x); >> + clip->y1 = min_t(u32, clip->y1, y); >> + clip->x2 = max_t(u32, clip->x2, x + width); >> + clip->y2 = max_t(u32, clip->y2, y + height); >> + spin_unlock_irqrestore(&helper->dirty_lock, flags); >> + >> + schedule_work(&helper->dirty_work); >> +} >> + >> +/** >> + * drm_fb_helper_deferred_io() - fbdev deferred_io callback function >> + * @info: fb_info struct pointer >> + * @pagelist: list of dirty mmap framebuffer pages >> + * >> + * This function is used as the &fb_deferred_io ->deferred_io >> + * callback function for flushing the fbdev mmap writes. >> + */ >> +void drm_fb_helper_deferred_io(struct fb_info *info, >> + struct list_head *pagelist) >> +{ >> + unsigned long start, end, min, max; >> + struct page *page; >> + u32 y1, y2; >> + >> + min = ULONG_MAX; >> + max = 0; >> + list_for_each_entry(page, pagelist, lru) { >> + start = page->index << PAGE_SHIFT; >> + end = start + PAGE_SIZE - 1; >> + min = min(min, start); >> + max = max(max, end); >> + } >> + >> + if (min < max) { >> + y1 = min / info->fix.line_length; >> + y2 = min_t(u32, max / info->fix.line_length, info->var.yres); > Needs a DIV_ROUND_UP here I think. > > Besides these two nits nothing else I've spotted. > > Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > >> + drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); >> + } >> +} >> +EXPORT_SYMBOL(drm_fb_helper_deferred_io); >> + >> /** >> * drm_fb_helper_sys_read - wrapper around fb_sys_read >> * @info: fb_info struct pointer >> @@ -862,7 +950,14 @@ EXPORT_SYMBOL(drm_fb_helper_sys_read); >> ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, >> size_t count, loff_t *ppos) >> { >> - return fb_sys_write(info, buf, count, ppos); >> + ssize_t ret; >> + >> + ret = fb_sys_write(info, buf, count, ppos); >> + if (ret > 0) >> + drm_fb_helper_dirty(info, 0, 0, info->var.xres, >> + info->var.yres); >> + >> + return ret; >> } >> EXPORT_SYMBOL(drm_fb_helper_sys_write); >> >> @@ -877,6 +972,8 @@ void drm_fb_helper_sys_fillrect(struct fb_info *info, >> const struct fb_fillrect *rect) >> { >> sys_fillrect(info, rect); >> + drm_fb_helper_dirty(info, rect->dx, rect->dy, >> + rect->width, rect->height); >> } >> EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); >> >> @@ -891,6 +988,8 @@ void drm_fb_helper_sys_copyarea(struct fb_info *info, >> const struct fb_copyarea *area) >> { >> sys_copyarea(info, area); >> + drm_fb_helper_dirty(info, area->dx, area->dy, >> + area->width, area->height); >> } >> EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); >> >> @@ -905,6 +1004,8 @@ void drm_fb_helper_sys_imageblit(struct fb_info *info, >> const struct fb_image *image) >> { >> sys_imageblit(info, image); >> + drm_fb_helper_dirty(info, image->dx, image->dy, >> + image->width, image->height); >> } >> EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); >> >> @@ -919,6 +1020,8 @@ void drm_fb_helper_cfb_fillrect(struct fb_info *info, >> const struct fb_fillrect *rect) >> { >> cfb_fillrect(info, rect); >> + drm_fb_helper_dirty(info, rect->dx, rect->dy, >> + rect->width, rect->height); >> } >> EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); >> >> @@ -933,6 +1036,8 @@ void drm_fb_helper_cfb_copyarea(struct fb_info *info, >> const struct fb_copyarea *area) >> { >> cfb_copyarea(info, area); >> + drm_fb_helper_dirty(info, area->dx, area->dy, >> + area->width, area->height); >> } >> EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); >> >> @@ -947,6 +1052,8 @@ void drm_fb_helper_cfb_imageblit(struct fb_info *info, >> const struct fb_image *image) >> { >> cfb_imageblit(info, image); >> + drm_fb_helper_dirty(info, image->dx, image->dy, >> + image->width, image->height); >> } >> EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); >> >> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h >> index 062723b..5b4aa35 100644 >> --- a/include/drm/drm_fb_helper.h >> +++ b/include/drm/drm_fb_helper.h >> @@ -172,6 +172,10 @@ struct drm_fb_helper_connector { >> * @funcs: driver callbacks for fb helper >> * @fbdev: emulated fbdev device info struct >> * @pseudo_palette: fake palette of 16 colors >> + * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to >> + * the screen buffer >> + * @dirty_lock: spinlock protecting @dirty_clip >> + * @dirty_work: worker used to flush the framebuffer >> * >> * This is the main structure used by the fbdev helpers. Drivers supporting >> * fbdev emulation should embedded this into their overall driver structure. >> @@ -189,6 +193,9 @@ struct drm_fb_helper { >> const struct drm_fb_helper_funcs *funcs; >> struct fb_info *fbdev; >> u32 pseudo_palette[17]; >> + struct drm_clip_rect dirty_clip; >> + spinlock_t dirty_lock; >> + struct work_struct dirty_work; >> >> /** >> * @kernel_fb_list: >> @@ -245,6 +252,9 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, >> >> void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper); >> >> +void drm_fb_helper_deferred_io(struct fb_info *info, >> + struct list_head *pagelist); >> + >> 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, >> @@ -368,6 +378,11 @@ static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) >> { >> } >> >> +static inline void drm_fb_helper_deferred_io(struct fb_info *info, >> + struct list_head *pagelist) >> +{ >> +} >> + >> static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info, >> char __user *buf, size_t count, >> loff_t *ppos) >> -- >> 2.2.2 >>
On Wed, Apr 27, 2016 at 09:24:52PM +0200, Noralf Trønnes wrote: > > Den 27.04.2016 21:20, skrev Daniel Vetter: > >On Wed, Apr 27, 2016 at 08:16:32PM +0200, Noralf Trønnes wrote: > >>This adds deferred io support to drm_fb_helper. > >>The fbdev framebuffer changes are flushed using the callback > >>(struct drm_framebuffer *)->funcs->dirty() by a dedicated worker > >>ensuring that it always runs in process context. > >> > >>Signed-off-by: Noralf Trønnes <noralf@tronnes.org> > >>--- > >> > >>Changes since v2: > >>- FB_DEFERRED_IO is now always selected by DRM_KMS_FB_HELPER, ifdef removed > >>- The drm_clip_rect utility functions are dropped, so open code it > >>- docs: use & to denote structs > >> > >>Changes since v1: > >>- Use a dedicated worker to run the framebuffer flushing like qxl does > >>- Add parameter descriptions to drm_fb_helper_deferred_io > >> > >> drivers/gpu/drm/Kconfig | 1 + > >> drivers/gpu/drm/drm_fb_helper.c | 109 +++++++++++++++++++++++++++++++++++++++- > >> include/drm/drm_fb_helper.h | 15 ++++++ > >> 3 files changed, 124 insertions(+), 1 deletion(-) > >> > >>diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig > >>index 9e4f2f1..8e6f34b 100644 > >>--- a/drivers/gpu/drm/Kconfig > >>+++ b/drivers/gpu/drm/Kconfig > >>@@ -52,6 +52,7 @@ config DRM_KMS_FB_HELPER > >> select FB_CFB_FILLRECT > >> select FB_CFB_COPYAREA > >> select FB_CFB_IMAGEBLIT > >>+ select FB_DEFERRED_IO > >> help > >> FBDEV helpers for KMS drivers. > >> > >>diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c > >>index 855108e..5112b5d 100644 > >>--- a/drivers/gpu/drm/drm_fb_helper.c > >>+++ b/drivers/gpu/drm/drm_fb_helper.c > >>@@ -48,6 +48,8 @@ MODULE_PARM_DESC(fbdev_emulation, > >> > >> static LIST_HEAD(kernel_fb_helper_list); > >> > >>+static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper); > >Instead of this forward decl just inline the few setup commands into > >drm_fb_helper_prepare. > > That would mean that I have to forward declare drm_fb_helper_dirty_work() > instead. Is that better? > Or should I relocate the functions? Yeah, just move them all I think. This means that usually the setup function for a component is at the very bottom, and also that you have the inverted reading order with first reading leaf/helper functions, then the bigger ones that assemble things together. Personally I find that backwards, but otoh consistency is more important. And avoid forward decls for static functions is standard style in the kernel. -Daniel
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 9e4f2f1..8e6f34b 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -52,6 +52,7 @@ config DRM_KMS_FB_HELPER select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT + select FB_DEFERRED_IO help FBDEV helpers for KMS drivers. diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 855108e..5112b5d 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -48,6 +48,8 @@ MODULE_PARM_DESC(fbdev_emulation, static LIST_HEAD(kernel_fb_helper_list); +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper); + /** * DOC: fbdev helpers * @@ -84,6 +86,15 @@ static LIST_HEAD(kernel_fb_helper_list); * and set up an initial configuration using the detected hardware, drivers * should call drm_fb_helper_single_add_all_connectors() followed by * drm_fb_helper_initial_config(). + * + * If CONFIG_FB_DEFERRED_IO is enabled and &drm_framebuffer_funcs ->dirty is + * set, the drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} + * functions will accumulate changes and schedule &fb_helper .dirty_work to run + * right away. This worker then calls the dirty() function ensuring that it + * will always run in process context since the fb_*() function could be + * running in atomic context. If drm_fb_helper_deferred_io() is used as the + * deferred_io callback it will also schedule dirty_work with the damage + * collected from the mmap page writes. */ /** @@ -650,6 +661,7 @@ void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, const struct drm_fb_helper_funcs *funcs) { INIT_LIST_HEAD(&helper->kernel_fb_list); + drm_fb_helper_dirty_init(helper); helper->funcs = funcs; helper->dev = dev; } @@ -834,6 +846,82 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) } EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); +static void drm_fb_helper_dirty_work(struct work_struct *work) +{ + struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, + dirty_work); + struct drm_clip_rect *clip = &helper->dirty_clip; + struct drm_clip_rect clip_copy; + unsigned long flags; + + spin_lock_irqsave(&helper->dirty_lock, flags); + clip_copy = *clip; + clip->x1 = clip->y1 = ~0; + clip->x2 = clip->y2 = 0; + spin_unlock_irqrestore(&helper->dirty_lock, flags); + + helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); +} + +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper) +{ + spin_lock_init(&helper->dirty_lock); + INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); + helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0; +} + +static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, + u32 width, u32 height) +{ + struct drm_fb_helper *helper = info->par; + struct drm_clip_rect *clip = &helper->dirty_clip; + unsigned long flags; + + if (!helper->fb->funcs->dirty) + return; + + spin_lock_irqsave(&helper->dirty_lock, flags); + clip->x1 = min_t(u32, clip->x1, x); + clip->y1 = min_t(u32, clip->y1, y); + clip->x2 = max_t(u32, clip->x2, x + width); + clip->y2 = max_t(u32, clip->y2, y + height); + spin_unlock_irqrestore(&helper->dirty_lock, flags); + + schedule_work(&helper->dirty_work); +} + +/** + * drm_fb_helper_deferred_io() - fbdev deferred_io callback function + * @info: fb_info struct pointer + * @pagelist: list of dirty mmap framebuffer pages + * + * This function is used as the &fb_deferred_io ->deferred_io + * callback function for flushing the fbdev mmap writes. + */ +void drm_fb_helper_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ + unsigned long start, end, min, max; + struct page *page; + u32 y1, y2; + + min = ULONG_MAX; + max = 0; + list_for_each_entry(page, pagelist, lru) { + start = page->index << PAGE_SHIFT; + end = start + PAGE_SIZE - 1; + min = min(min, start); + max = max(max, end); + } + + if (min < max) { + y1 = min / info->fix.line_length; + y2 = min_t(u32, max / info->fix.line_length, info->var.yres); + drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); + } +} +EXPORT_SYMBOL(drm_fb_helper_deferred_io); + /** * drm_fb_helper_sys_read - wrapper around fb_sys_read * @info: fb_info struct pointer @@ -862,7 +950,14 @@ EXPORT_SYMBOL(drm_fb_helper_sys_read); ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, size_t count, loff_t *ppos) { - return fb_sys_write(info, buf, count, ppos); + ssize_t ret; + + ret = fb_sys_write(info, buf, count, ppos); + if (ret > 0) + drm_fb_helper_dirty(info, 0, 0, info->var.xres, + info->var.yres); + + return ret; } EXPORT_SYMBOL(drm_fb_helper_sys_write); @@ -877,6 +972,8 @@ void drm_fb_helper_sys_fillrect(struct fb_info *info, const struct fb_fillrect *rect) { sys_fillrect(info, rect); + drm_fb_helper_dirty(info, rect->dx, rect->dy, + rect->width, rect->height); } EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); @@ -891,6 +988,8 @@ void drm_fb_helper_sys_copyarea(struct fb_info *info, const struct fb_copyarea *area) { sys_copyarea(info, area); + drm_fb_helper_dirty(info, area->dx, area->dy, + area->width, area->height); } EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); @@ -905,6 +1004,8 @@ void drm_fb_helper_sys_imageblit(struct fb_info *info, const struct fb_image *image) { sys_imageblit(info, image); + drm_fb_helper_dirty(info, image->dx, image->dy, + image->width, image->height); } EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); @@ -919,6 +1020,8 @@ void drm_fb_helper_cfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) { cfb_fillrect(info, rect); + drm_fb_helper_dirty(info, rect->dx, rect->dy, + rect->width, rect->height); } EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); @@ -933,6 +1036,8 @@ void drm_fb_helper_cfb_copyarea(struct fb_info *info, const struct fb_copyarea *area) { cfb_copyarea(info, area); + drm_fb_helper_dirty(info, area->dx, area->dy, + area->width, area->height); } EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); @@ -947,6 +1052,8 @@ void drm_fb_helper_cfb_imageblit(struct fb_info *info, const struct fb_image *image) { cfb_imageblit(info, image); + drm_fb_helper_dirty(info, image->dx, image->dy, + image->width, image->height); } EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h index 062723b..5b4aa35 100644 --- a/include/drm/drm_fb_helper.h +++ b/include/drm/drm_fb_helper.h @@ -172,6 +172,10 @@ struct drm_fb_helper_connector { * @funcs: driver callbacks for fb helper * @fbdev: emulated fbdev device info struct * @pseudo_palette: fake palette of 16 colors + * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to + * the screen buffer + * @dirty_lock: spinlock protecting @dirty_clip + * @dirty_work: worker used to flush the framebuffer * * This is the main structure used by the fbdev helpers. Drivers supporting * fbdev emulation should embedded this into their overall driver structure. @@ -189,6 +193,9 @@ struct drm_fb_helper { const struct drm_fb_helper_funcs *funcs; struct fb_info *fbdev; u32 pseudo_palette[17]; + struct drm_clip_rect dirty_clip; + spinlock_t dirty_lock; + struct work_struct dirty_work; /** * @kernel_fb_list: @@ -245,6 +252,9 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper); +void drm_fb_helper_deferred_io(struct fb_info *info, + struct list_head *pagelist); + 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, @@ -368,6 +378,11 @@ static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) { } +static inline void drm_fb_helper_deferred_io(struct fb_info *info, + struct list_head *pagelist) +{ +} + static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, size_t count, loff_t *ppos)
This adds deferred io support to drm_fb_helper. The fbdev framebuffer changes are flushed using the callback (struct drm_framebuffer *)->funcs->dirty() by a dedicated worker ensuring that it always runs in process context. Signed-off-by: Noralf Trønnes <noralf@tronnes.org> --- Changes since v2: - FB_DEFERRED_IO is now always selected by DRM_KMS_FB_HELPER, ifdef removed - The drm_clip_rect utility functions are dropped, so open code it - docs: use & to denote structs Changes since v1: - Use a dedicated worker to run the framebuffer flushing like qxl does - Add parameter descriptions to drm_fb_helper_deferred_io drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/drm_fb_helper.c | 109 +++++++++++++++++++++++++++++++++++++++- include/drm/drm_fb_helper.h | 15 ++++++ 3 files changed, 124 insertions(+), 1 deletion(-) -- 2.2.2