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drm/i915: Clear the last_retired_context following a hang/reset 

Following a hang and reset, we know that the engine is idle and all
context state has been saved or lost. Consequently, we know that the
engine is no longer referencing the last context and we can relinquish
our tracking.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Tvrtko Ursulin <tursulin@ursulin.net>
Link: http://patchwork.freedesktop.org/patch/msgid/20170212172002.23072-5-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson 2017-02-12 17:20:02 +00:00
parent fe3288b5da
commit 2ae557388d
1 changed files with 7 additions and 1 deletions
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8
drivers/gpu/drm/i915/i915_gem.c
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@ -2788,8 +2788,14 @@ void i915_gem_reset(struct drm_i915_private *dev_priv)
i915_gem_retire_requests(dev_priv);
for_each_engine(engine, dev_priv, id)
for_each_engine(engine, dev_priv, id) {
struct i915_gem_context *ctx;
i915_gem_reset_engine(engine);
ctx = fetch_and_zero(&engine->last_retired_context);
if (ctx)
engine->context_unpin(engine, ctx);
}
i915_gem_restore_fences(dev_priv);