Attachment 50467 Details for Bug 35930 – DDX: Implement pageflip completion event handling.

[patch] DDX: Implement pageflip completion event handling.

0001-dri2-Implement-handling-of-pageflip-completion-event.patch (text/plain), 11.39 KB, created by Mario Kleiner on 2011-08-22 17:54:18 UTC

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Creator: Mario Kleiner

Created: 2011-08-22 17:54:18 UTC

Size: 11.39 KB

patch

obsolete

>>From ca1dbb08daa5f5ed5362fda132f216b24ad2ebdc Mon Sep 17 00:00:00 2001
>From: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
>Date: Fri, 19 Aug 2011 22:43:15 +0200
>Subject: [PATCH 1/3] dri2: Implement handling of pageflip completion events.
>
>Requests pageflip completion events from the kernel.
>Implements pageflip completion handler to finalize
>and timestamp swaps.
>
>Completion handler includes a consistency check, and
>disambiguation if multiple crtc's are involved in a
>pageflip (e.g., clone mode, extendend desktop). Only
>the timestamp of the crtc whose vblank event initially
>triggered the swap is used, but handler waits for flip
>completion on all involved crtc's before completing the
>swap and releasing the old framebuffer.
>
>This code is almost identical to the code used in the
>ati/radeon ddx and intel ddx.
>
>Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
>---
> src/drmmode_display.c |  105 +++++++++++++++++++++++++++++++++++++++++++++++--
> src/nouveau_dri2.c    |   89 +++++++++++++++++++++++++++++++++++++++--
> src/nv_proto.h        |    5 ++-
> 3 files changed, 189 insertions(+), 10 deletions(-)
>
>diff --git a/src/drmmode_display.c b/src/drmmode_display.c
>index 3afef66..bcb2a94 100644
>--- a/src/drmmode_display.c
>+++ b/src/drmmode_display.c
>@@ -83,6 +83,21 @@ typedef struct {
>     drmmode_prop_ptr props;
> } drmmode_output_private_rec, *drmmode_output_private_ptr;
> 
>+typedef struct {
>+    drmmode_ptr drmmode;
>+    unsigned old_fb_id;
>+    int flip_count;
>+    void *event_data;
>+    unsigned int fe_frame;
>+    unsigned int fe_tv_sec;
>+    unsigned int fe_tv_usec;
>+} drmmode_flipdata_rec, *drmmode_flipdata_ptr;
>+
>+typedef struct {
>+    drmmode_flipdata_ptr flipdata;
>+    Bool dispatch_me;
>+} drmmode_flipevtcarrier_rec, *drmmode_flipevtcarrier_ptr;
>+
> static void drmmode_output_dpms(xf86OutputPtr output, int mode);
> 
> static drmmode_ptr
>@@ -1246,13 +1261,17 @@ drmmode_cursor_init(ScreenPtr pScreen)
> }
> 
> Bool
>-drmmode_page_flip(DrawablePtr draw, PixmapPtr back, void *priv)
>+drmmode_page_flip(DrawablePtr draw, PixmapPtr back, void *priv,
>+		  unsigned int ref_crtc_hw_id)
> {
> 	ScrnInfoPtr scrn = xf86Screens[draw->pScreen->myNum];
> 	xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
> 	drmmode_crtc_private_ptr crtc = config->crtc[0]->driver_private;
> 	drmmode_ptr mode = crtc->drmmode;
> 	int ret, i, old_fb_id;
>+	int emitted = 0;
>+	drmmode_flipdata_ptr flipdata;
>+	drmmode_flipevtcarrier_ptr flipcarrier;
> 
> 	old_fb_id = mode->fb_id;
> 	ret = drmModeAddFB(mode->fd, scrn->virtualX, scrn->virtualY,
>@@ -1265,24 +1284,64 @@ drmmode_page_flip(DrawablePtr draw, PixmapPtr back, void *priv)
> 		return FALSE;
> 	}
> 
>+	flipdata = calloc(1, sizeof(drmmode_flipdata_rec));
>+	if (!flipdata) {
>+		xf86DrvMsg(scrn->scrnIndex, X_WARNING,
>+		"flip queue: data alloc failed.\n");
>+		goto error_undo;
>+	}
>+
>+	flipdata->event_data = priv;
>+	flipdata->drmmode = mode;
>+
> 	for (i = 0; i < config->num_crtc; i++) {
> 		crtc = config->crtc[i]->driver_private;
> 
> 		if (!config->crtc[i]->enabled)
> 			continue;
> 
>+		flipdata->flip_count++;
>+
>+		flipcarrier = calloc(1, sizeof(drmmode_flipevtcarrier_rec));
>+		if (!flipcarrier) {
>+			xf86DrvMsg(scrn->scrnIndex, X_WARNING,
>+				   "flip queue: carrier alloc failed.\n");
>+			if (emitted == 0)
>+				free(flipdata);
>+			goto error_undo;
>+		}
>+
>+		/* Only the reference crtc will finally deliver its page flip
>+		 * completion event. All other crtc's events will be discarded.
>+		 */
>+		flipcarrier->dispatch_me = ((1 << i) == ref_crtc_hw_id);
>+		flipcarrier->flipdata = flipdata;
>+
> 		ret = drmModePageFlip(mode->fd, crtc->mode_crtc->crtc_id,
>-				      mode->fb_id, 0, priv);
>+				      mode->fb_id, DRM_MODE_PAGE_FLIP_EVENT,
>+				      flipcarrier);
> 		if (ret) {
> 			xf86DrvMsg(scrn->scrnIndex, X_WARNING,
> 				   "flip queue failed: %s\n", strerror(errno));
>-			return FALSE;
>+
>+			free(flipcarrier);
>+			if (emitted == 0)
>+				free(flipdata);
>+			goto error_undo;
> 		}
>+
>+		emitted++;
> 	}
> 
>-	drmModeRmFB(mode->fd, old_fb_id);
>+	/* Will release old fb after all crtc's completed flip. */
>+	flipdata->old_fb_id = old_fb_id;
> 
> 	return TRUE;
>+
>+error_undo:
>+	drmModeRmFB(mode->fd, mode->fb_id);
>+	mode->fb_id = old_fb_id;
>+	return FALSE;
> }
> 
> #ifdef HAVE_LIBUDEV
>@@ -1348,6 +1407,40 @@ drmmode_uevent_fini(ScrnInfoPtr scrn)
> }
> 
> static void
>+drmmode_flip_handler(int fd, unsigned int frame, unsigned int tv_sec,
>+		     unsigned int tv_usec, void *event_data)
>+{
>+	drmmode_flipevtcarrier_ptr flipcarrier = event_data;
>+	drmmode_flipdata_ptr flipdata = flipcarrier->flipdata;
>+	drmmode_ptr drmmode = flipdata->drmmode;
>+
>+	/* Is this the event whose info shall be delivered to higher level? */
>+	if (flipcarrier->dispatch_me) {
>+		/* Yes: Cache msc, ust for later delivery. */
>+		flipdata->fe_frame = frame;
>+		flipdata->fe_tv_sec = tv_sec;
>+		flipdata->fe_tv_usec = tv_usec;
>+	}
>+	free(flipcarrier);
>+
>+	/* Last crtc completed flip? */
>+	flipdata->flip_count--;
>+	if (flipdata->flip_count > 0)
>+		return;
>+
>+	/* Release framebuffer */
>+	drmModeRmFB(drmmode->fd, flipdata->old_fb_id);
>+
>+	if (flipdata->event_data == NULL)
>+		return;
>+
>+	/* Deliver cached msc, ust from reference crtc to flip event handler */
>+	nouveau_dri2_flip_event_handler(flipdata->fe_frame, flipdata->fe_tv_sec,
>+					flipdata->fe_tv_usec, flipdata->event_data);
>+	free(flipdata);
>+}
>+
>+static void
> drmmode_wakeup_handler(pointer data, int err, pointer p)
> {
> 	ScrnInfoPtr scrn = data;
>@@ -1377,6 +1470,10 @@ drmmode_screen_init(ScreenPtr pScreen)
> 	/* Plug in a vblank event handler */
> 	drmmode->event_context.version = DRM_EVENT_CONTEXT_VERSION;
> 	drmmode->event_context.vblank_handler = nouveau_dri2_vblank_handler;
>+
>+	/* Plug in a pageflip completion event handler */
>+	drmmode->event_context.page_flip_handler = drmmode_flip_handler;
>+
> 	AddGeneralSocket(drmmode->fd);
> 
> 	/* Register a wakeup handler to get informed on DRM events */
>diff --git a/src/nouveau_dri2.c b/src/nouveau_dri2.c
>index 1a68ed3..87eaf08 100644
>--- a/src/nouveau_dri2.c
>+++ b/src/nouveau_dri2.c
>@@ -136,6 +136,7 @@ struct nouveau_dri2_vblank_state {
> 	DRI2BufferPtr src;
> 	DRI2SwapEventPtr func;
> 	void *data;
>+	unsigned int frame;
> };
> 
> static Bool
>@@ -222,6 +223,18 @@ nouveau_dri2_finish_swap(DrawablePtr draw, unsigned int frame,
> 	REGION_INIT(0, &reg, (&(BoxRec){ 0, 0, draw->width, draw->height }), 0);
> 	REGION_TRANSLATE(0, &reg, draw->x, draw->y);
> 
>+	/* Main crtc for this drawable shall finally deliver pageflip event. */
>+	unsigned int ref_crtc_hw_id = nv_window_belongs_to_crtc(scrn, draw->x,
>+								draw->y,
>+								draw->width,
>+								draw->height);
>+
>+	/* Whenever first crtc is involved, choose it as reference, as
>+	 * its vblank event triggered this swap.
>+	 */
>+	if (ref_crtc_hw_id & 1)
>+		ref_crtc_hw_id = 1;
>+
> 	/* Throttle on the previous frame before swapping */
> 	nouveau_bo_map(dst_bo, NOUVEAU_BO_RD);
> 	nouveau_bo_unmap(dst_bo);
>@@ -246,7 +259,7 @@ nouveau_dri2_finish_swap(DrawablePtr draw, unsigned int frame,
> 
> 		if (DRI2CanFlip(draw)) {
> 			type = DRI2_FLIP_COMPLETE;
>-			ret = drmmode_page_flip(draw, src_pix, s);
>+			ret = drmmode_page_flip(draw, src_pix, s, ref_crtc_hw_id);
> 			if (!ret)
> 				goto out;
> 		}
>@@ -255,6 +268,10 @@ nouveau_dri2_finish_swap(DrawablePtr draw, unsigned int frame,
> 		SWAP(nouveau_pixmap(dst_pix)->bo, nouveau_pixmap(src_pix)->bo);
> 
> 		DamageRegionProcessPending(draw);
>+
>+		/* If it is a page flip, finish it in the flip event handler. */
>+		if (type == DRI2_FLIP_COMPLETE)
>+			return;
> 	} else {
> 		type = DRI2_BLIT_COMPLETE;
> 
>@@ -289,7 +306,7 @@ nouveau_dri2_schedule_swap(ClientPtr client, DrawablePtr draw,
> 			   DRI2SwapEventPtr func, void *data)
> {
> 	struct nouveau_dri2_vblank_state *s;
>-	CARD64 current_msc;
>+	CARD64 current_msc, expect_msc;
> 	int ret;
> 
> 	/* Initialize a swap structure */
>@@ -298,7 +315,7 @@ nouveau_dri2_schedule_swap(ClientPtr client, DrawablePtr draw,
> 		return FALSE;
> 
> 	*s = (struct nouveau_dri2_vblank_state)
>-		{ SWAP, client, draw->id, dst, src, func, data };
>+		{ SWAP, client, draw->id, dst, src, func, data, 0 };
> 
> 	if (can_sync_to_vblank(draw)) {
> 		/* Get current sequence */
>@@ -316,10 +333,10 @@ nouveau_dri2_schedule_swap(ClientPtr client, DrawablePtr draw,
> 		ret = nouveau_wait_vblank(draw, DRM_VBLANK_ABSOLUTE |
> 					  DRM_VBLANK_EVENT,
> 					  max(current_msc, *target_msc - 1),
>-					  NULL, NULL, s);
>+					  &expect_msc, NULL, s);
> 		if (ret)
> 			goto fail;
>-
>+		s->frame = (unsigned int) expect_msc & 0xffffffff;
> 	} else {
> 		/* We can't/don't want to sync to vblank, just swap. */
> 		nouveau_dri2_finish_swap(draw, 0, 0, 0, s);
>@@ -423,6 +440,68 @@ nouveau_dri2_vblank_handler(int fd, unsigned int frame,
> 	}
> }
> 
>+void
>+nouveau_dri2_flip_event_handler(unsigned int frame, unsigned int tv_sec,
>+				unsigned int tv_usec, void *event_data)
>+{
>+	struct nouveau_dri2_vblank_state *flip = event_data;
>+	DrawablePtr draw;
>+	ScreenPtr screen;
>+	ScrnInfoPtr scrn;
>+	int status;
>+	PixmapPtr pixmap;
>+
>+	status = dixLookupDrawable(&draw, flip->draw, serverClient,
>+				   M_ANY, DixWriteAccess);
>+	if (status != Success) {
>+		free(flip);
>+		return;
>+	}
>+
>+	screen = draw->pScreen;
>+	scrn = xf86Screens[screen->myNum];
>+
>+	pixmap = screen->GetScreenPixmap(screen);
>+	xf86DrvMsg(scrn->scrnIndex, X_INFO,
>+		   "%s:%d fevent[%p] width %d pitch %d (/4 %d)\n",
>+		   __func__, __LINE__, flip, pixmap->drawable.width,
>+		   pixmap->devKind, pixmap->devKind/4);
>+
>+	/* We assume our flips arrive in order, so we don't check the frame */
>+	switch (flip->action) {
>+	case SWAP:
>+		/* Check for too small vblank count of pageflip completion,
>+		 * taking wraparound into account. This usually means some
>+		 * defective kms pageflip completion, causing wrong (msc, ust)
>+		 * return values and possible visual corruption.
>+		 * Skip test for frame == 0, as this is a valid constant value
>+		 * reported by all Linux kernels at least up to Linux 3.0.
>+		 */
>+		if ((frame != 0) &&
>+		    (frame < flip->frame) && (flip->frame - frame < 5)) {
>+			xf86DrvMsg(scrn->scrnIndex, X_WARNING,
>+				   "%s: Pageflip has impossible msc %d < target_msc %d\n",
>+				   __func__, frame, flip->frame);
>+			/* All-Zero values signal failure of (msc, ust)
>+			 * timestamping to client.
>+			 */
>+			frame = tv_sec = tv_usec = 0;
>+		}
>+
>+		DRI2SwapComplete(flip->client, draw, frame, tv_sec, tv_usec,
>+				 DRI2_FLIP_COMPLETE, flip->func,
>+				 flip->data);
>+		break;
>+	default:
>+		xf86DrvMsg(scrn->scrnIndex, X_WARNING,
>+			   "%s: unknown vblank event received\n", __func__);
>+		/* Unknown type */
>+		break;
>+	}
>+
>+	free(flip);
>+}
>+
> Bool
> nouveau_dri2_init(ScreenPtr pScreen)
> {
>diff --git a/src/nv_proto.h b/src/nv_proto.h
>index 2e4fce0..2bd2ac7 100644
>--- a/src/nv_proto.h
>+++ b/src/nv_proto.h
>@@ -7,7 +7,8 @@ void drmmode_adjust_frame(ScrnInfoPtr pScrn, int x, int y, int flags);
> void drmmode_remove_fb(ScrnInfoPtr pScrn);
> Bool drmmode_cursor_init(ScreenPtr pScreen);
> void drmmode_fbcon_copy(ScreenPtr pScreen);
>-Bool drmmode_page_flip(DrawablePtr draw, PixmapPtr back, void *priv);
>+Bool drmmode_page_flip(DrawablePtr draw, PixmapPtr back, void *priv,
>+		       unsigned int ref_crtc_hw_id);
> void drmmode_screen_init(ScreenPtr pScreen);
> void drmmode_screen_fini(ScreenPtr pScreen);
> 
>@@ -26,6 +27,8 @@ Bool nouveau_allocate_surface(ScrnInfoPtr scrn, int width, int height,
> void nouveau_dri2_vblank_handler(int fd, unsigned int frame,
> 				 unsigned int tv_sec, unsigned int tv_usec,
> 				 void *event_data);
>+void nouveau_dri2_flip_event_handler(unsigned int frame, unsigned int tv_sec,
>+				     unsigned int tv_usec, void *event_data);
> Bool nouveau_dri2_init(ScreenPtr pScreen);
> void nouveau_dri2_fini(ScreenPtr pScreen);
> 
>-- 
>1.7.1
>

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