[PATCH 23/26] drm/i915/perf: Add preemption check while waiting for OA

[Timo Aaltonen]

From: Lionel Landwerlin <lionel.g.landwerlin at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1871957

While we're waiting for the OA configuration to apply, let's give a
chance to other contexts that might need to run other workloads.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Suggested-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191114140224.21818-1-lionel.g.landwerlin@intel.com
(cherry picked from commit dd590f680089af64b68282c7758177ec224f60d2)
Signed-off-by: Timo Aaltonen <timo.aaltonen at canonical.com>
---
 drivers/gpu/drm/i915/i915_perf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index bf9431552048..b9e1e49f353b 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1730,6 +1730,8 @@ static int alloc_noa_wait(struct i915_perf_stream *stream)
 	*cs++ = MI_MATH_ADD;
 	*cs++ = MI_MATH_STOREINV(MI_MATH_REG(JUMP_PREDICATE), MI_MATH_REG_CF);
 
+	*cs++ = MI_ARB_CHECK;
+
 	/*
 	 * Transfer the result into the predicate register to be used for the
 	 * predicated jump.
-- 
2.25.1