drm: Widen vblank count to 64-bits [v3]

This modifies the datatypes used by the vblank code to provide 64 bits
of vblank count.

The driver interfaces have been left using 32 bits of vblank count;
all of the code necessary to widen that value for the user API was
already included to handle devices returning fewer than 32-bits.

This will provide the necessary datatypes for the Vulkan API.

v2:

 * Re-write wait_vblank ioctl to ABSOLUTE sequence

    When an application uses the WAIT_VBLANK ioctl with RELATIVE
    or NEXTONMISS bits set, the target vblank interval is updated
    within the kernel. We need to write that target back to the
    ioctl buffer and update the flags bits so that if the wait is
    interrupted by a signal, when it is re-started, it will target
    precisely the same vblank count as before.

 * Leave driver API with 32-bit vblank count

v3:

 * Rebase on top of Arnd Bergmann's patch which had
   the switch to ktime_t parts.

[airlied: fix conflict with Ville vblank change].

Suggested-by:  Michel Dänzer <michel@daenzer.net>
Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit 2affbc16983e4fc90960bc7f70e7615f4228199b)

1 files changed, 7 insertions, 3 deletions

diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h
index 6a58e2e91a0f..cce53130510f 100644
--- a/include/drm/drm_vblank.h
+++ b/include/drm/drm_vblank.h
@@ -48,6 +48,10 @@ struct drm_pending_vblank_event {
 	 */
 	unsigned int pipe;
 	/**
+	 * @sequence: frame event should be triggered at
+	 */
+	u64 sequence;
+	/**
 	 * @event: Actual event which will be sent to userspace.
 	 */
 	struct drm_event_vblank event;
@@ -88,7 +92,7 @@ struct drm_vblank_crtc {
 	/**
 	 * @count: Current software vblank counter.
 	 */
-	u32 count;
+	u64 count;
 	/**
 	 * @time: Vblank timestamp corresponding to @count.
 	 */
@@ -152,8 +156,8 @@ struct drm_vblank_crtc {
 };
 
 int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
-u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
-u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
+u64 drm_crtc_vblank_count(struct drm_crtc *crtc);
+u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
 				   ktime_t *vblanktime);
 void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
 			       struct drm_pending_vblank_event *e);