Mesa (master): i965: Create new program cache bo when clearing the program cache

[Jordan Justen]

Module: Mesa
Branch: master
Commit: 83e60ce927142752c57163fcb8b30eca2370d014
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=83e60ce927142752c57163fcb8b30eca2370d014

Author: Jordan Justen <jordan.l.justen at intel.com>
Date:   Fri Feb  2 13:03:10 2018 -0800

i965: Create new program cache bo when clearing the program cache

When the disk shader cache CI testing was enabled, we started noticing
occasional failures on deqp test runs. (Mainly SNB, rarely HSW)

Before this change, when we cleared the (in memory) program cache we
reused the same bo. Since the disk shader cache quickly restores
programs, it appears that this would lead to overwrites of the older
program binaries in the in memory program cache that apparently were
still executing in some cases. If these programs were still executing,
this could cause a GPU hang.

This issue is probably not disk shader cache specific, but may have
been hidden due to the compiler taking time to recompile programs
after the cache was cleared.

v2:
 * Don't add `copy` param to brw_cache_new_bo (Ken)
 * Call from brw_program_cache_check_size (Ken)

Cc: Kenneth Graunke <kenneth at whitecape.org>
Cc: mesa-stable at lists.freedesktop.org
Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_program_cache.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mesa/drivers/dri/i965/brw_program_cache.c b/src/mesa/drivers/dri/i965/brw_program_cache.c
index 9266273b5d..14c356db32 100644
--- a/src/mesa/drivers/dri/i965/brw_program_cache.c
+++ b/src/mesa/drivers/dri/i965/brw_program_cache.c
@@ -460,6 +460,7 @@ brw_program_cache_check_size(struct brw_context *brw)
       perf_debug("Exceeded state cache size limit.  Clearing the set "
                  "of compiled programs, which will trigger recompiles\n");
       brw_clear_cache(brw, &brw->cache);
+      brw_cache_new_bo(&brw->cache, brw->cache.bo->size);
    }
 }