1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/selftests/igt_reset.c b/drivers/gpu/drm/i915/selftests/igt_reset.c
new file mode 100644
index 000000000000..208a966da8ca
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/igt_reset.c
@@ -0,0 +1,44 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2018 Intel Corporation
+ */
+
+#include "igt_reset.h"
+
+#include "../i915_drv.h"
+#include "../intel_ringbuffer.h"
+
+void igt_global_reset_lock(struct drm_i915_private *i915)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+
+	pr_debug("%s: current gpu_error=%08lx\n",
+		 __func__, i915->gpu_error.flags);
+
+	while (test_and_set_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags))
+		wait_event(i915->gpu_error.reset_queue,
+			   !test_bit(I915_RESET_BACKOFF,
+				     &i915->gpu_error.flags));
+
+	for_each_engine(engine, i915, id) {
+		while (test_and_set_bit(I915_RESET_ENGINE + id,
+					&i915->gpu_error.flags))
+			wait_on_bit(&i915->gpu_error.flags,
+				    I915_RESET_ENGINE + id,
+				    TASK_UNINTERRUPTIBLE);
+	}
+}
+
+void igt_global_reset_unlock(struct drm_i915_private *i915)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+
+	for_each_engine(engine, i915, id)
+		clear_bit(I915_RESET_ENGINE + id, &i915->gpu_error.flags);
+
+	clear_bit(I915_RESET_BACKOFF, &i915->gpu_error.flags);
+	wake_up_all(&i915->gpu_error.reset_queue);
+}