From 2621cefaa42b3a7455d30e78831c6b55290d40c8 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 9 Jul 2018 13:20:43 +0100 Subject: [PATCH] drm/i915: Provide a timeout to i915_gem_wait_for_idle() on setup 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 Cc: Joonas Lahtinen Cc: Mika Kuoppala Cc: Tvrtko Ursulin Reviewed-by: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20180709122044.7028-2-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 91d705a67d38..b35cbfd16c9c 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -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);