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.
Cc: Kenneth Graunke <kenn...@whitecape.org>
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: mesa-sta...@lists.freedesktop.org (if the original gt4 patch goes to stable)
---
Sarah, you should check this on KBL.
Cc: Sarah Sharp <sarah.a.sh...@linux.intel.com>
---
src/mesa/drivers/dri/i965/brw_device_info.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_device_info.c
b/src/mesa/drivers/dri/i965/brw_device_info.c
index 2ebc084..6117fd3 100644
--- a/src/mesa/drivers/dri/i965/brw_device_info.c
+++ b/src/mesa/drivers/dri/i965/brw_device_info.c
@@ -337,6 +337,14 @@ 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 docs:
+ * 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=1152MB [sic] for
URB,
+ * but only 1008KB of this will be used.
+ */
+ .urb.size = 1008 / 3,
};
static const struct brw_device_info brw_device_info_bxt = {
--
2.6.2
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