From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= Date: Sun, 24 Apr 2016 20:48:58 +0000 Subject: [PATCH v2 4/8] drm/fb-helper: Add fb_deferred_io support Message-Id: <1461530942-22485-5-git-send-email-noralf@tronnes.org> List-Id: References: <1461530942-22485-1-git-send-email-noralf@tronnes.org> In-Reply-To: <1461530942-22485-1-git-send-email-noralf@tronnes.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org Cc: tomi.valkeinen@ti.com, laurent.pinchart@ideasonboard.com, linux-kernel@vger.kernel.org This adds deferred io support if CONFIG_FB_DEFERRED_IO is enabled. 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 Tr=C3=B8nnes --- 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/drm_fb_helper.c | 127 ++++++++++++++++++++++++++++++++++++= +++- include/drm/drm_fb_helper.h | 17 ++++++ 2 files changed, 143 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helpe= r.c index 855108e..46ee6f8 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -40,6 +40,7 @@ #include #include #include +#include static bool drm_fbdev_emulation =3D true; module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600); @@ -48,6 +49,10 @@ MODULE_PARM_DESC(fbdev_emulation, static LIST_HEAD(kernel_fb_helper_list); +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper); +static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, + u32 width, u32 height); + /** * DOC: fbdev helpers * @@ -84,6 +89,16 @@ 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 + * (struct drm_framebuffer *)->funcs->dirty is set, the + * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions + * will accumulate changes and schedule (struct fb_helper).dirty_work to r= un + * 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. */ /** @@ -401,11 +416,14 @@ backoff: static int restore_fbdev_mode(struct drm_fb_helper *fb_helper) { struct drm_device *dev =3D fb_helper->dev; + struct fb_info *info =3D fb_helper->fbdev; struct drm_plane *plane; int i; drm_warn_on_modeset_not_all_locked(dev); + drm_fb_helper_dirty(info, 0, 0, info->var.xres, info->var.yres); + if (fb_helper->atomic) return restore_fbdev_mode_atomic(fb_helper); @@ -650,6 +668,7 @@ void drm_fb_helper_prepare(struct drm_device *dev, stru= ct 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 =3D funcs; helper->dev =3D dev; } @@ -834,6 +853,93 @@ void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb= _helper) } EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); +#ifdef CONFIG_FB_DEFERRED_IO +static void drm_fb_helper_dirty_work(struct work_struct *work) +{ + struct drm_fb_helper *helper =3D container_of(work, struct drm_fb_helper, + dirty_work); + struct drm_clip_rect clip; + unsigned long flags; + + spin_lock_irqsave(&helper->dirty_lock, flags); + clip =3D helper->dirty_clip; + drm_clip_rect_reset(&helper->dirty_clip); + spin_unlock_irqrestore(&helper->dirty_lock, flags); + + helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip, 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); +} + +static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, + u32 width, u32 height) +{ + struct drm_fb_helper *helper =3D info->par; + struct drm_clip_rect clip; + unsigned long flags; + + if (!helper->fb->funcs->dirty) + return; + + clip.x1 =3D x; + clip.x2 =3D x + width; + clip.y1 =3D y; + clip.y2 =3D y + height; + + spin_lock_irqsave(&helper->dirty_lock, flags); + drm_clip_rect_merge(&helper->dirty_clip, &clip, 1, 0, 0, 0); + 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 (struct 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 =3D ULONG_MAX; + max =3D 0; + list_for_each_entry(page, pagelist, lru) { + start =3D page->index << PAGE_SHIFT; + end =3D start + PAGE_SIZE - 1; + min =3D min(min, start); + max =3D max(max, end); + } + + if (min < max) { + y1 =3D min / info->fix.line_length; + y2 =3D 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); + +#else +static void drm_fb_helper_dirty_init(struct drm_fb_helper *helper) +{ +} + +static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, + u32 width, u32 height) +{ +} +#endif /* CONFIG_FB_DEFERRED_IO */ + /** * drm_fb_helper_sys_read - wrapper around fb_sys_read * @info: fb_info struct pointer @@ -862,7 +968,14 @@ EXPORT_SYMBOL(drm_fb_helper_sys_read); ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *b= uf, size_t count, loff_t *ppos) { - return fb_sys_write(info, buf, count, ppos); + ssize_t ret; + + ret =3D 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 +990,8 @@ 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 +1006,8 @@ 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 +1022,8 @@ 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 +1038,8 @@ 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 +1054,8 @@ 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 +1070,8 @@ 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..dde825c 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 structur= e. @@ -189,6 +193,11 @@ struct drm_fb_helper { const struct drm_fb_helper_funcs *funcs; struct fb_info *fbdev; u32 pseudo_palette[17]; +#ifdef CONFIG_FB_DEFERRED_IO + struct drm_clip_rect dirty_clip; + spinlock_t dirty_lock; + struct work_struct dirty_work; +#endif /** * @kernel_fb_list: @@ -245,6 +254,9 @@ void drm_fb_helper_fill_fix(struct fb_info *info, uint3= 2_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 *b= uf, @@ -368,6 +380,11 @@ 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