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authorNoralf Trønnes <noralf@tronnes.org>2016-04-28 17:18:33 +0200
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-05-02 16:22:03 +0200
commiteaa434defaca1781fb2932c685289b610aeb8b4b (patch)
tree718167fd30355f4366b6224320044d35f19da92c /include/drm
parentdrm/qxl: Change drm_fb_helper_sys_*() calls to sys_*() (diff)
downloadlinux-eaa434defaca1781fb2932c685289b610aeb8b4b.tar.xz
linux-eaa434defaca1781fb2932c685289b610aeb8b4b.zip
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
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_fb_helper.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
index 062723bdcabe..5b4aa35026a3 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)