From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 5 Feb 2018 15:24:31 +0000
Subject: drm/i915: Skip post-reset request emission if the engine is not idle
Git-commit: 01b8fdc5222007bdfc905941173f82576898a7f7
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Since commit 7b6da818d86f ("drm/i915: Restore the kernel context after a
GPU reset on an idle engine") we submit a request following the engine
reset. The intent is that we don't submit a request if the engine is
busy (as it will restart active by itself) but we only checked to see if
there were remaining requests in flight on the hardware and skipped
checking to see if there were any ready requests that would be
immediately submitted on restart (the same time as our new request would
be). Having convinced the engine to appear idle in the previous patch,
we can use intel_engine_is_idle() as a better test to only submit a new
request if there are no pending requests.
As it happens, this is tripping up igt/drv_selftest/live_hangcheck in CI
as we overfill the kernel_context ringbuffer trigger an infinite
recursion from within the reset.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104786
References: 7b6da818d86f ("drm/i915: Restore the kernel context after a GPU reset on an idle engine")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180205152431.12163-4-chris@chris-wilson.co.uk
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/i915/i915_gem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3141,7 +3141,7 @@ void i915_gem_reset(struct drm_i915_priv
* an incoherent read by the CS (presumably stale TLB). An
* empty request appears sufficient to paper over the glitch.
*/
- if (list_empty(&engine->timeline->requests)) {
+ if (intel_engine_is_idle(engine)) {
struct drm_i915_gem_request *rq;
rq = i915_gem_request_alloc(engine,