[Intel-gfx] [PATCH] drm/i915: Update write_domains on active list after flush.

[Daniel Vetter]

On Sun, Feb 07, 2010 at 06:39:49PM +0100, Adam Lantos wrote:
> This patch seems to fix the BUG_ON in my case. However, I still have
> lots of these:

Good, thanks for testing.

> [drm:i915_gem_object_pin_and_relocate] *ERROR* Failure to install fence: -28
> [drm:i915_gem_object_pin_and_relocate] *ERROR* Failure to install fence: -28
> [drm:i915_gem_do_execbuffer] *ERROR* Failed to pin buffer 5 of 7,
> total 8519680 bytes: -28
> [drm:i915_gem_do_execbuffer] *ERROR* 369 objects [7 pinned], 91172864
> object bytes [11747328 pinned], 11780096/260308992 gtt bytes
> 
> and also visual corruption in the 'present windows' plugin (which was
> working fine w/ 2.6.32.y)

That's to be expected. Userspace is submitting batchbuffers the hw can't
handle (that's all the "Failure to install fence" noise in your dmesg
about, there are simply not enough fences available, -28 == -ENOSPC).

Furthermore there's a bug in the kernel (patch has not yet hit -stable,
iirc) that artificially limits the available fences from 8 to 5. Just
cherry pick

drm/i915: Don't reserve compatibility fence regs in KMS mode.

from drm-intel-next branch.
-Daniel
-- 
Daniel Vetter
Mail: daniel at ffwll.ch
Mobile: +41 (0)79 365 57 48