From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Mon, 9 Jul 2018 13:20:43 +0100
Subject: drm/i915: Provide a timeout to i915_gem_wait_for_idle() on setup
Git-commit: 2621cefaa42b3a7455d30e78831c6b55290d40c8
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
With a broken GPU we expect it to fail during the initial
GPU setup where do a couple of context switches to record the defaults.
This is a task that takes a few milliseconds even on the slowest of
devices, but we may have to wait 60s for hangcheck to give in and
declare the machine inoperable. In this a case where any gpu hang is
unacceptable, both from a timeliness and practical standpoint.
We can therefore set a timeout on our wait-for-idle that is shorter than
the hangcheck (which may be up to 60s for a declaring a wedged driver)
and so detect the broken GPU much more quickly during driver load (and
so prevent stalling userspace for ages).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180709122044.7028-2-chris@chris-wilson.co.uk
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/i915/i915_gem.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5369,11 +5369,11 @@ static int __intel_engines_record_defaul
if (err)
goto err_active;
- err = i915_gem_wait_for_idle(i915,
- I915_WAIT_LOCKED,
- MAX_SCHEDULE_TIMEOUT);
- if (err)
+ if (i915_gem_wait_for_idle(i915, I915_WAIT_LOCKED, HZ / 5)) {
+ i915_gem_set_wedged(i915);
+ err = -EIO; /* Caller will declare us wedged */
goto err_active;
+ }
assert_kernel_context_is_current(i915);