Re: [rebase 1/3] drm: Add drm_vblank_work_flush_all().

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Hey,

On 2024-04-05 15:36, Lucas De Marchi wrote:
what does "rebase" instead of "PATCH" is supposed to mean here?
And then we have a "PATCH v2" as reply to this one.

Shouldn't this go to dri-devel (too)?

Lucas De Marchi
I was rebasing so no changes were originally made.

Afterwards I found out why the patch series failed,
and sent a v2 patch for that specifically.

I think this should go to dri-devel, forgot this patch required it. :)

Can send a full v2 patch series in the beginning of next week. It looks like I still missed a uaf even with this fix. :(

Cheers,
~Maarten


On Thu, Apr 04, 2024 at 12:48:11PM +0200, Maarten Lankhorst wrote:
From: Maarten Lankhorst <dev@xxxxxxxxxxxx>

In some cases we want to flush all vblank work, right before vblank_off
for example. Add a simple function to make this possible.

Signed-off-by: Maarten Lankhorst <dev@xxxxxxxxxxxx>
---
drivers/gpu/drm/drm_vblank_work.c | 22 ++++++++++++++++++++++
include/drm/drm_vblank_work.h     |  2 ++
2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/drm_vblank_work.c b/drivers/gpu/drm/drm_vblank_work.c
index 43cd5c0f4f6f..ff86f2b2e052 100644
--- a/drivers/gpu/drm/drm_vblank_work.c
+++ b/drivers/gpu/drm/drm_vblank_work.c
@@ -232,6 +232,28 @@ void drm_vblank_work_flush(struct drm_vblank_work *work)
}
EXPORT_SYMBOL(drm_vblank_work_flush);

+/**
+ * drm_vblank_work_flush_all - flush all currently pending vblank work on crtc.
+ * @crtc: crtc for which vblank work to flush
+ *
+ * Wait until all currently queued vblank work on @crtc
+ * has finished executing once.
+ */
+void drm_vblank_work_flush_all(struct drm_crtc *crtc)
+{
+    struct drm_device *dev = crtc->dev;
+    struct drm_vblank_crtc *vblank = &dev->vblank[drm_crtc_index(crtc)];
+
+    spin_lock_irq(&dev->event_lock);
+    wait_event_lock_irq(vblank->work_wait_queue,
+                waitqueue_active(&vblank->work_wait_queue),
+                dev->event_lock);
+    spin_unlock_irq(&dev->event_lock);
+
+    kthread_flush_worker(vblank->worker);
+}
+EXPORT_SYMBOL(drm_vblank_work_flush_all);
+
/**
 * drm_vblank_work_init - initialize a vblank work item
 * @work: vblank work item
diff --git a/include/drm/drm_vblank_work.h b/include/drm/drm_vblank_work.h
index eb41d0810c4f..e04d436b7297 100644
--- a/include/drm/drm_vblank_work.h
+++ b/include/drm/drm_vblank_work.h
@@ -17,6 +17,7 @@ struct drm_crtc;
 * drm_vblank_work_init()
 * drm_vblank_work_cancel_sync()
 * drm_vblank_work_flush()
+ * drm_vblank_work_flush_all()
 */
struct drm_vblank_work {
    /**
@@ -67,5 +68,6 @@ void drm_vblank_work_init(struct drm_vblank_work *work, struct drm_crtc *crtc,
              void (*func)(struct kthread_work *work));
bool drm_vblank_work_cancel_sync(struct drm_vblank_work *work);
void drm_vblank_work_flush(struct drm_vblank_work *work);
+void drm_vblank_work_flush_all(struct drm_crtc *crtc);

#endif /* !_DRM_VBLANK_WORK_H_ */
--
2.43.0




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