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drm/i915: Stop parking the signaler around reset

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We cannot call kthread_park() from softirq context, so let's avoid it
entirely during the reset. We wanted to suspend the signaler so that it
would not mark a request as complete at the same time as we marked it as
being in error. Instead of parking the signaling, stop the engine from
advancing so that the GPU doesn't emit the breadcrumb for our chosen
"guilty" request.

v2: Refactor setting STOP_RING so that we don't have the same code thrice

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Michałt Winiarski <michal.winiarski@intel.com>
CC: Michel Thierry <michel.thierry@intel.com>
Cc: Jeff McGee <jeff.mcgee@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180516183355.10553-8-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2018-05-16 19:33:55 +01:00
parent 63572937ce
commit 3f6e982230
6 changed files with 41 additions and 22 deletions
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14
drivers/gpu/drm/i915/i915_gem.c
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@@ -3015,18 +3015,6 @@ i915_gem_reset_prepare_engine(struct intel_engine_cs *engine)
*/
intel_uncore_forcewake_get(engine->i915, FORCEWAKE_ALL);
/*
* Prevent the signaler thread from updating the request
* state (by calling dma_fence_signal) as we are processing
* the reset. The write from the GPU of the seqno is
* asynchronous and the signaler thread may see a different
* value to us and declare the request complete, even though
* the reset routine have picked that request as the active
* (incomplete) request. This conflict is not handled
* gracefully!
*/
kthread_park(engine->breadcrumbs.signaler);
request = engine->reset.prepare(engine);
if (request && request->fence.error == -EIO)
request = ERR_PTR(-EIO); /* Previous reset failed! */
@@ -3229,8 +3217,6 @@ void i915_gem_reset_finish_engine(struct intel_engine_cs *engine)
{
engine->reset.finish(engine);
kthread_unpark(engine->breadcrumbs.signaler);
intel_uncore_forcewake_put(engine->i915, FORCEWAKE_ALL);
}