drm/i915/gt: Give engine->kernel_context distinct timeline lock classes (6ad145fe) · Commits · 戴 / test

Assign a separate lockclass to the perma-pinned timelines of the kernel_context, such that we can use them from within the user timelines should we ever need to inject GPU operations to fixup faults during request construction. Signed-off-by:

Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Matthew Auld <matthew.william.auld@gmail.com> Reviewed-by:

Matthew Auld <matthew.william.auld@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191008185941.15228-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/intel_engine_cs.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -736,6 +736,7 @@ intel_engine_init_active(struct intel_engine_cs *engine, unsigned int subclass)
		static struct intel_context *
		create_kernel_context(struct intel_engine_cs *engine)
		{
		static struct lock_class_key kernel;
		struct intel_context *ce;
		int err;

		@@ -751,6 +752,14 @@ create_kernel_context(struct intel_engine_cs *engine)
		return ERR_PTR(err);
		}

		/*
		* Give our perma-pinned kernel timelines a separate lockdep class,
		* so that we can use them from within the normal user timelines
		* should we need to inject GPU operations during their request
		* construction.
		*/
		lockdep_set_class(&ce->timeline->mutex, &kernel);

		return ce;
		}

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