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sna: Pre-emptively bind framebuffers into the GTT 

In order to avoid rendering to the bo and then stalling before we can
pin it the display plane, bind the framebuffer into the GTT (by using a
GTT mmap) during the initial allocation.

References: https://bugs.freedesktop.org/show_bug.cgi?id=77436
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-04-15 16:27:44 +01:00
parent fd0579016b
commit 83f49767f8
1 changed files with 10 additions and 0 deletions
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10
src/sna/kgem.c
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@ -4194,6 +4194,16 @@ static void __kgem_bo_make_scanout(struct kgem *kgem,
do_ioctl(kgem->fd, DRM_IOCTL_MODE_ADDFB, &arg) == 0) {
bo->scanout = true;
bo->delta = arg.fb_id;
/* Pre-emptively move the object into the mappable
* portion to avoid rebinding later when busy.
*/
if (bo->map__gtt == NULL)
bo->map__gtt = __kgem_bo_map__gtt(kgem, bo);
if (bo->map__gtt) {
*(uint32_t *)bo->map__gtt = 0;
bo->domain = DOMAIN_GTT;
}
}
}