drm/i915: Remove has-kernel-context

We can no longer assume execution ordering, and in particular we cannot
assume which context will execute last. One side-effect of this is that
we cannot determine if the kernel-context is resident on the GPU, so
remove the routines that claimed to do so.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190308093657.8640-4-chris@chris-wilson.co.uk

1 files changed, 0 insertions, 31 deletions

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 18174f808fd8..8e326556499e 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1090,37 +1090,6 @@ bool intel_engines_are_idle(struct drm_i915_private *i915)
         return true;
 }
 
-/**
- * intel_engine_has_kernel_context:
- * @engine: the engine
- *
- * Returns true if the last context to be executed on this engine, or has been
- * executed if the engine is already idle, is the kernel context
- * (#i915.kernel_context).
- */
-bool intel_engine_has_kernel_context(const struct intel_engine_cs *engine)
-{
-        const struct intel_context *kernel_context =
-                to_intel_context(engine->i915->kernel_context, engine);
-        struct i915_request *rq;
-
-        lockdep_assert_held(&engine->i915->drm.struct_mutex);
-
-        if (!engine->context_size)
-                return true;
-
-        /*
-         * Check the last context seen by the engine. If active, it will be
-         * the last request that remains in the timeline. When idle, it is
-         * the last executed context as tracked by retirement.
-         */
-        rq = __i915_active_request_peek(&engine->timeline.last_request);
-        if (rq)
-                return rq->hw_context == kernel_context;
-        else
-                return engine->last_retired_context == kernel_context;
-}
-
 void intel_engines_reset_default_submission(struct drm_i915_private *i915)
 {
         struct intel_engine_cs *engine;