Before we idle, on parking, we switch to the kernel context such that we
have a scratch context loaded while the GPU idle, protecting any
precious user state. Be paranoid and assume that the idle state may have
been trashed, and reset the kernel_context image after idling.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200102131707.1463945-4-chris@chris-wilson.co.uk
{
struct intel_engine_cs *engine =
container_of(wf, typeof(*engine), wakeref);
+ struct intel_context *ce;
void *map;
ENGINE_TRACE(engine, "\n");
if (!IS_ERR_OR_NULL(map))
engine->pinned_default_state = map;
+ /* Discard stale context state from across idling */
+ ce = engine->kernel_context;
+ if (ce)
+ ce->ops->reset(ce);
+
if (engine->unpark)
engine->unpark(engine);
intel_llc_enable(>->llc);
for_each_engine(engine, gt, id) {
- struct intel_context *ce;
-
intel_engine_pm_get(engine);
- ce = engine->kernel_context;
- if (ce) {
- GEM_BUG_ON(!intel_context_is_pinned(ce));
- ce->ops->reset(ce);
- }
-
engine->serial++; /* kernel context lost */
err = engine->resume(engine);
return intel_context_active_acquire(ce);
}
+static void mock_context_reset(struct intel_context *ce)
+{
+}
+
static const struct intel_context_ops mock_context_ops = {
.alloc = mock_context_alloc,
.enter = intel_context_enter_engine,
.exit = intel_context_exit_engine,
+ .reset = mock_context_reset,
.destroy = mock_context_destroy,
};