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drm/i915/perf: Manually acquire engine-wakeref around use of kernel_context 

The engine->kernel_context is a special case for request emission. Since
it is used as the barrier within the engine's wakeref, we must acquire the
wakeref before submitting a request to the kernel_context.

Reported-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200227085723.1961649-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-02-27 08:57:06 +00:00
parent a5af081d01
commit d236e2ac53
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_perf.c
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@ -2196,7 +2196,9 @@ static int gen8_modify_self(struct intel_context *ce,
struct i915_request *rq;
int err;
intel_engine_pm_get(ce->engine);
rq = i915_request_create(ce);
intel_engine_pm_put(ce->engine);
if (IS_ERR(rq))
return PTR_ERR(rq);