[Mesa-dev] [PATCH] st/xorg: flush after loading the cursor

[Marcin Slusarz]

On Mon, May 02, 2011 at 08:57:25AM +0200, Michel Dänzer wrote:
> On Mon, 2011-05-02 at 00:01 +0200, Marcin Slusarz wrote: 
> > We need cursor data to land in destination buffer before drmModeSetCursor.
> > It fixes "cursor lag" at least on nv50.
> > ---
> >  src/gallium/state_trackers/xorg/xorg_crtc.c |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> > 
> > diff --git a/src/gallium/state_trackers/xorg/xorg_crtc.c b/src/gallium/state_trackers/xorg/xorg_crtc.c
> > index b8d9474..e8ca631 100644
> > --- a/src/gallium/state_trackers/xorg/xorg_crtc.c
> > +++ b/src/gallium/state_trackers/xorg/xorg_crtc.c
> > @@ -247,6 +247,7 @@ crtc_load_cursor_argb_ga3d(xf86CrtcPtr crtc, CARD32 * image)
> >  		   64, 64, (void*)image, 64 * 4, 0, 0);
> >      ms->ctx->transfer_unmap(ms->ctx, transfer);
> >      ms->ctx->transfer_destroy(ms->ctx, transfer);
> > +    ms->ctx->flush(ms->ctx, NULL);
> >  
> >      if (crtc->cursor_shown)
> >  	drmModeSetCursor(ms->fd, crtcp->drm_crtc->crtc_id,
> 
> To guarantee that the data lands before drmModeSetCursor, you'd have to
> take a fence from the flush and finish that as well.
> 

Thanks!

Updated patch below.

---
From: Marcin Slusarz <marcin.slusarz at gmail.com>
Subject: [PATCH v2] st/xorg: flush after loading the cursor

We need cursor data to land in destination buffer before drmModeSetCursor.
It fixes "cursor lag" on nv50.
---
 src/gallium/state_trackers/xorg/xorg_crtc.c |   23 +++++++++++++++--------
 1 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/src/gallium/state_trackers/xorg/xorg_crtc.c b/src/gallium/state_trackers/xorg/xorg_crtc.c
index 23970d6..0499ed1 100644
--- a/src/gallium/state_trackers/xorg/xorg_crtc.c
+++ b/src/gallium/state_trackers/xorg/xorg_crtc.c
@@ -210,6 +210,9 @@ crtc_load_cursor_argb_ga3d(xf86CrtcPtr crtc, CARD32 * image)
     modesettingPtr ms = modesettingPTR(crtc->scrn);
     struct crtc_private *crtcp = crtc->driver_private;
     struct pipe_transfer *transfer;
+    struct pipe_fence_handle *fence = NULL;
+    struct pipe_context *ctx = ms->ctx;
+    struct pipe_screen *screen = ms->screen;
 
     if (!crtcp->cursor_tex) {
 	struct pipe_resource templat;
@@ -230,24 +233,28 @@ crtc_load_cursor_argb_ga3d(xf86CrtcPtr crtc, CARD32 * image)
 	memset(&whandle, 0, sizeof(whandle));
 	whandle.type = DRM_API_HANDLE_TYPE_KMS;
 
-	crtcp->cursor_tex = ms->screen->resource_create(ms->screen,
-						       &templat);
-	ms->screen->resource_get_handle(ms->screen, crtcp->cursor_tex, &whandle);
+	crtcp->cursor_tex = screen->resource_create(screen, &templat);
+	screen->resource_get_handle(screen, crtcp->cursor_tex, &whandle);
 
 	crtcp->cursor_handle = whandle.handle;
     }
 
-    transfer = pipe_get_transfer(ms->ctx, crtcp->cursor_tex,
+    transfer = pipe_get_transfer(ctx, crtcp->cursor_tex,
                                  0, 0,
                                  PIPE_TRANSFER_WRITE,
                                  0, 0, 64, 64);
-    ptr = ms->ctx->transfer_map(ms->ctx, transfer);
+    ptr = ctx->transfer_map(ctx, transfer);
     util_copy_rect(ptr, crtcp->cursor_tex->format,
 		   transfer->stride, 0, 0,
 		   64, 64, (void*)image, 64 * 4, 0, 0);
-    ms->ctx->transfer_unmap(ms->ctx, transfer);
-    ms->ctx->transfer_destroy(ms->ctx, transfer);
-    ms->ctx->flush(ms->ctx, NULL);
+    ctx->transfer_unmap(ctx, transfer);
+    ctx->transfer_destroy(ctx, transfer);
+    ctx->flush(ctx, &fence);
+
+    if (fence) {
+	screen->fence_finish(screen, fence, PIPE_TIMEOUT_INFINITE);
+	screen->fence_reference(screen, &fence, NULL);
+    }
 
     if (crtc->cursor_shown)
 	drmModeSetCursor(ms->fd, crtcp->drm_crtc->crtc_id,
-- 
1.7.4.1