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drm/i915/gt: Give engine->kernel_context distinct timeline lock classes 

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
This commit is contained in:
Chris Wilson 2019-10-08 19:59:41 +01:00
parent 7c98501acb
commit 6ad145fe02
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/i915/gt/intel_engine_cs.c
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@ -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;
}