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i965/skl/gt4: Fix URB programming restriction.

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The comment in the code details the restriction. Thanks to Ken for having a very
helpful conversation with me, and spotting the blurb in the link I sent him :P.

There are still stability problems for me on GT4, but this definitely helps with
some of the failures.

v2: Comment fixes

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Ben Widawsky 2015-11-06 18:12:27 -08:00
parent c4182bb9b0
commit 55314c5be4
1 changed files with 9 additions and 0 deletions
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9
src/mesa/drivers/dri/i965/brw_device_info.c
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@ -337,6 +337,15 @@ static const struct brw_device_info brw_device_info_skl_gt3 = {
static const struct brw_device_info brw_device_info_skl_gt4 = {
GEN9_FEATURES, .gt = 4,
/* From the "L3 Allocation and Programming" documentation:
*
* "URB is limited to 1008KB due to programming restrictions. This is not a
* restriction of the L3 implementation, but of the FF and other clients.
* Therefore, in a GT4 implementation it is possible for the programmed
* allocation of the L3 data array to provide 3*384KB=1152KB for URB, but
* only 1008KB of this will be used."
*/
.urb.size = 1008 / 3,
};
static const struct brw_device_info brw_device_info_bxt = {