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drm/i915: Detect a failed GPU reset+recovery

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If we can't recover the GPU after the reset, mark it as wedged to cancel
the outstanding tasks and to prevent new users from trying to use the
broken GPU.

v2: Check the same ring is hung again before declaring the reset broken.
v3: use engine_stalled (Mika)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1484668747-9120-6-git-send-email-mika.kuoppala@intel.com
This commit is contained in:
Chris Wilson
2017-01-17 17:59:06 +02:00
parent 61da536204
commit 0e178aef8f
3 changed files with 21 additions and 4 deletions
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16
drivers/gpu/drm/i915/i915_gem.c
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@@ -2625,16 +2625,28 @@ static bool engine_stalled(struct intel_engine_cs *engine)
return true;
}
void i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
int i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
int err = 0;
/* Ensure irq handler finishes, and not run again. */
for_each_engine(engine, dev_priv, id)
for_each_engine(engine, dev_priv, id) {
struct drm_i915_gem_request *request;
tasklet_kill(&engine->irq_tasklet);
if (engine_stalled(engine)) {
request = i915_gem_find_active_request(engine);
if (request && request->fence.error == -EIO)
err = -EIO; /* Previous reset failed! */
}
}
i915_gem_revoke_fences(dev_priv);
return err;
}
static void skip_request(struct drm_i915_gem_request *request)