drm/fb-helper: Add fb_deferred_io support

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.

For those wondering why we need to be able to handle atomic calling
contexts: Both panic paths and cursor code and fbcon blanking can run
from atomic. See

commit bcb39af4486be07e896fc374a2336bad3104ae0a
Author: Dave Airlie <airlied@redhat.com>
Date:   Thu Feb 7 11:19:15 2013 +1000

    drm/udl: make usage as a console safer

for where this was originally discovered.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
[danvet: Augment commit message with why we need to handle atomic
contexts.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1461856717-6476-4-git-send-email-noralf@tronnes.org

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index f2a74d0..414c79b 100644 (file)
--- 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..62f849f 100644 (file)
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -84,6 +84,15 @@ 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.
  */
 
 /**
@@ -637,6 +646,23 @@ static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
        kfree(helper->crtc_info);
 }
 
+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);
+}
+
 /**
  * drm_fb_helper_prepare - setup a drm_fb_helper structure
  * @dev: DRM device
@@ -650,6 +676,9 @@ 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);
+       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;
        helper->funcs = funcs;
        helper->dev = dev;
 }
@@ -834,6 +863,59 @@ 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(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, DIV_ROUND_UP(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 +944,14 @@ 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 +966,8 @@ 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 +982,8 @@ 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 +998,8 @@ 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 +1014,8 @@ 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 +1030,8 @@ 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 +1046,8 @@ 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 (file)
--- 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)