[PATCH 07/25] drm/i915: Trim delays for wedging

Chris Wilson
2019-02-19T12:23:57Z

CI still reports the occasional multi-second delay for resets, in
particular along the wedge+recovery paths. As the likely, and unbounded,
delay here is from sync_rcu, use the expedited variant instead.

Testcase: igt/gem_eio/unwedge-stress
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
---
drivers/gpu/drm/i915/i915_reset.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c
index 358ab1d51570..9f6da5e4b007 100644
--- a/drivers/gpu/drm/i915/i915_reset.c
+++ b/drivers/gpu/drm/i915/i915_reset.c
@@ -835,7 +835,7 @@ static void __i915_gem_set_wedged(struct drm_i915_private *i915)
* either this call here to intel_engine_write_global_seqno, or the one
* in nop_submit_request.
*/
- synchronize_rcu();
+ synchronize_rcu_expedited();

/* Mark all executing requests as skipped */
for_each_engine(engine, i915, id)