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drm/i915: Declare the driver wedged if hangcheck makes no progress

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Hangcheck is our back up in case the GPU or the driver gets stuck. It
detects when the GPU is not making any progress and issues a GPU reset.
However, if the driver is failing to make any progress, we can get
ourselves into a situation where we continually try resetting the GPU to
no avail. Employ a second timeout such that if we continue to see the
same seqno (the stalled engine has made no progress at all) over the
course of several hangchecks, declare the driver wedged and attempt to
start afresh.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180602104853.17140-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson
2018-06-02 11:48:53 +01:00
parent 5db1d4ea91
commit 1fd00c0fae
4 changed files with 23 additions and 4 deletions
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17
drivers/gpu/drm/i915/intel_hangcheck.c
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@@ -294,6 +294,7 @@ static void hangcheck_store_sample(struct intel_engine_cs *engine,
engine->hangcheck.seqno = hc->seqno;
engine->hangcheck.action = hc->action;
engine->hangcheck.stalled = hc->stalled;
engine->hangcheck.wedged = hc->wedged;
}
static enum intel_engine_hangcheck_action
@@ -368,6 +369,9 @@ static void hangcheck_accumulate_sample(struct intel_engine_cs *engine,
hc->stalled = time_after(jiffies,
engine->hangcheck.action_timestamp + timeout);
hc->wedged = time_after(jiffies,
engine->hangcheck.action_timestamp +
I915_ENGINE_WEDGED_TIMEOUT);
}
static void hangcheck_declare_hang(struct drm_i915_private *i915,
@@ -409,7 +413,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
gpu_error.hangcheck_work.work);
struct intel_engine_cs *engine;
enum intel_engine_id id;
unsigned int hung = 0, stuck = 0;
unsigned int hung = 0, stuck = 0, wedged = 0;
if (!i915_modparams.enable_hangcheck)
return;
@@ -440,6 +444,17 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
if (hc.action != ENGINE_DEAD)
stuck |= intel_engine_flag(engine);
}
if (engine->hangcheck.wedged)
wedged |= intel_engine_flag(engine);
}
if (wedged) {
dev_err(dev_priv->drm.dev,
"GPU recovery timed out,"
" cancelling all in-flight rendering.\n");
GEM_TRACE_DUMP();
i915_gem_set_wedged(dev_priv);
}
if (hung)