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drm/i915: Provide a timeout to i915_gem_wait_for_idle() on setup

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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
This commit is contained in:
Chris Wilson 2018-07-09 13:20:43 +01:00
parent ec625fb932
commit 2621cefaa4
1 changed files with 4 additions and 4 deletions
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8
drivers/gpu/drm/i915/i915_gem.c
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@ -5362,11 +5362,11 @@ static int __intel_engines_record_defaults(struct drm_i915_private *i915)
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);