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authorChris Wilson <chris@chris-wilson.co.uk>2011-03-03 18:15:03 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2011-03-04 09:58:31 +0000
commit18dd7932c7fc13e230384bcab08311a5de5d6de7 (patch)
tree91a6e1e76e8034375b0493fcd63d8d3ed6d2d725 /src/mesa/drivers/dri/i965
parent1546291e5b8d3ac02f5bee38252f9d479bcf95cc (diff)
i965: Handle URB_FENCE erratum for Broadwater
There is a silicon bug which causes unpredictable behaviour if the URB_FENCE command should cross a cache-line boundary. Pad before the command to avoid such occurrences. As this command only applies to gen4/5, do the fixup unconditionally as the specs do not actually state for which chip it was fixed (and the cost is negligible)... Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'src/mesa/drivers/dri/i965')
-rw-r--r--src/mesa/drivers/dri/i965/brw_urb.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_urb.c b/src/mesa/drivers/dri/i965/brw_urb.c
index dfc1551aca..b0419d8a42 100644
--- a/src/mesa/drivers/dri/i965/brw_urb.c
+++ b/src/mesa/drivers/dri/i965/brw_urb.c
@@ -248,5 +248,13 @@ void brw_upload_urb_fence(struct brw_context *brw)
uf.bits1.sf_fence = brw->urb.cs_start;
uf.bits1.cs_fence = brw->urb.size;
+ /* erratum: URB_FENCE must not cross a 64byte cacheline */
+ if ((brw->intel.batch.used & 15) > 12) {
+ int pad = 16 - (brw->intel.batch.used & 15);
+ do
+ brw->intel.batch.map[brw->intel.batch.used++] = MI_NOOP;
+ while (--pad);
+ }
+
BRW_BATCH_STRUCT(brw, &uf);
}