[LIBDRM PATCH 2/2] Add support for crtc_id in page flip events

[Maarten Lankhorst]

Add a page_flip_handler2 member to drmEventContext and bump
DRM_EVENT_CONTEXT.

To make sure that the new api works as intended, modetest is
changed to use it.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: David Airlie <airlied at linux.ie>
Cc: Daniel Stone <daniels at collabora.com>
---
 include/drm/drm.h         |  2 +-
 tests/modetest/modetest.c | 20 ++++++++++++++++++--
 xf86drm.h                 | 16 +++++++++++++++-
 xf86drmMode.c             | 23 ++++++++++++++++-------
 4 files changed, 50 insertions(+), 11 deletions(-)

diff --git a/include/drm/drm.h b/include/drm/drm.h
index d7874c6f0d47..6da7f2a1f40b 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -844,7 +844,7 @@ struct drm_event_vblank {
 	__u32 tv_sec;
 	__u32 tv_usec;
 	__u32 sequence;
-	__u32 reserved;
+	__u32 crtc_id; /* 0 on older kernels that do not support this */
 };
 
 /* typedef area */
diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
index 21d543842c95..56ee7f2adc83 100644
--- a/tests/modetest/modetest.c
+++ b/tests/modetest/modetest.c
@@ -913,8 +913,8 @@ static void set_property(struct device *dev, struct property_arg *p)
 /* -------------------------------------------------------------------------- */
 
 static void
-page_flip_handler(int fd, unsigned int frame,
-		  unsigned int sec, unsigned int usec, void *data)
+page_flip_handler2(int fd, unsigned int crtc_id, unsigned int frame,
+		   unsigned int sec, unsigned int usec, void *data)
 {
 	struct pipe_arg *pipe;
 	unsigned int new_fb_id;
@@ -927,6 +927,8 @@ page_flip_handler(int fd, unsigned int frame,
 	else
 		new_fb_id = pipe->fb_id[0];
 
+	assert(crtc_id == pipe->crtc->crtc->crtc_id);
+
 	drmModePageFlip(fd, pipe->crtc->crtc->crtc_id, new_fb_id,
 			DRM_MODE_PAGE_FLIP_EVENT, pipe);
 	pipe->current_fb_id = new_fb_id;
@@ -941,6 +943,19 @@ page_flip_handler(int fd, unsigned int frame,
 	}
 }
 
+static void
+page_flip_handler(int fd, unsigned int frame,
+		  unsigned int sec, unsigned int usec, void *data)
+{
+	struct pipe_arg *pipe = data;
+	static int once = 0;
+
+	if (!once++)
+		fprintf(stderr, "kernel doesn't pass crtc_id, or using older libdrm\n");
+
+	page_flip_handler2(fd, pipe->crtc->crtc->crtc_id, frame, sec, usec, data);
+}
+
 static bool format_support(const drmModePlanePtr ovr, uint32_t fmt)
 {
 	unsigned int i;
@@ -1233,6 +1248,7 @@ static void test_page_flip(struct device *dev, struct pipe_arg *pipes, unsigned
 	evctx.version = DRM_EVENT_CONTEXT_VERSION;
 	evctx.vblank_handler = NULL;
 	evctx.page_flip_handler = page_flip_handler;
+	evctx.page_flip_handler2 = page_flip_handler2;
 
 	while (1) {
 #if 0
diff --git a/xf86drm.h b/xf86drm.h
index 481d882aa017..556390cdec47 100644
--- a/xf86drm.h
+++ b/xf86drm.h
@@ -728,7 +728,7 @@ extern void drmMsg(const char *format, ...) DRM_PRINTFLIKE(1, 2);
 extern int drmSetMaster(int fd);
 extern int drmDropMaster(int fd);
 
-#define DRM_EVENT_CONTEXT_VERSION 2
+#define DRM_EVENT_CONTEXT_VERSION 3
 
 typedef struct _drmEventContext {
 
@@ -748,6 +748,20 @@ typedef struct _drmEventContext {
 				  unsigned int tv_usec,
 				  void *user_data);
 
+	/*
+	 * Page flip handler used when kernel supports passing crtc_id
+	 * to userspace.
+	 *
+	 * If the kernel doesn't support passing crtc_id, the old
+	 * page_flip_handler() member will be called if set,
+	 * if it's NULL, this function will be called with crtc_id set to 0.
+	 */
+	void (*page_flip_handler2)(int fd,
+				   unsigned int crtc_id,
+				   unsigned int sequence,
+				   unsigned int tv_sec,
+				   unsigned int tv_usec,
+				   void *user_data);
 } drmEventContext, *drmEventContextPtr;
 
 extern int drmHandleEvent(int fd, drmEventContextPtr evctx);
diff --git a/xf86drmMode.c b/xf86drmMode.c
index f7b59484153e..62bfd69b1d14 100644
--- a/xf86drmMode.c
+++ b/xf86drmMode.c
@@ -902,15 +902,24 @@ int drmHandleEvent(int fd, drmEventContextPtr evctx)
 					      U642VOID (vblank->user_data));
 			break;
 		case DRM_EVENT_FLIP_COMPLETE:
-			if (evctx->version < 2 ||
-			    evctx->page_flip_handler == NULL)
+			if (evctx->version < 2)
 				break;
 			vblank = (struct drm_event_vblank *) e;
-			evctx->page_flip_handler(fd,
-						 vblank->sequence,
-						 vblank->tv_sec,
-						 vblank->tv_usec,
-						 U642VOID (vblank->user_data));
+
+			if (evctx->version >= 3 && evctx->page_flip_handler2 &&
+			    (vblank->crtc_id || !evctx->page_flip_handler))
+				evctx->page_flip_handler2(fd,
+							  vblank->crtc_id,
+							  vblank->sequence,
+							  vblank->tv_sec,
+							  vblank->tv_usec,
+							  U642VOID (vblank->user_data));
+			else if (evctx->page_flip_handler)
+				evctx->page_flip_handler(fd,
+							 vblank->sequence,
+							 vblank->tv_sec,
+							 vblank->tv_usec,
+							 U642VOID (vblank->user_data));
 			break;
 		default:
 			break;
-- 
2.7.4