[PATCH 08/12] drm/i915/guc: Add selftest for a hung GuC

[John.C.Harrison@Intel.com]

From: Rahul Kumar Singh <rahul.kumar.singh@intel.com>

Add a test to check that the hangcheck will recover from a submission
hang in the GuC.

Signed-off-by: Rahul Kumar Singh <rahul.kumar.singh@intel.com>
---
 .../gpu/drm/i915/gt/uc/intel_guc_submission.c |   1 +
 .../drm/i915/gt/uc/selftest_guc_hangcheck.c   | 159 ++++++++++++++++++
 .../drm/i915/selftests/i915_live_selftests.h  |   1 +
 3 files changed, 161 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/gt/uc/selftest_guc_hangcheck.c

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 7537459080278..72832a4f4bac7 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -4937,4 +4937,5 @@ bool intel_guc_virtual_engine_has_heartbeat(const struct intel_engine_cs *ve)
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftest_guc.c"
 #include "selftest_guc_multi_lrc.c"
+#include "selftest_guc_hangcheck.c"
 #endif
diff --git a/drivers/gpu/drm/i915/gt/uc/selftest_guc_hangcheck.c b/drivers/gpu/drm/i915/gt/uc/selftest_guc_hangcheck.c
new file mode 100644
index 0000000000000..af913c4b09d37
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/selftest_guc_hangcheck.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright �� 2019 Intel Corporation
+ */
+
+#include "selftests/igt_spinner.h"
+#include "selftests/igt_reset.h"
+#include "selftests/intel_scheduler_helpers.h"
+#include "gt/intel_engine_heartbeat.h"
+#include "gem/selftests/mock_context.h"
+
+#define BEAT_INTERVAL	100
+
+static struct i915_request *nop_request(struct intel_engine_cs *engine)
+{
+	struct i915_request *rq;
+
+	rq = intel_engine_create_kernel_request(engine);
+	if (IS_ERR(rq))
+		return rq;
+
+	i915_request_get(rq);
+	i915_request_add(rq);
+
+	return rq;
+}
+
+static int intel_hang_guc(void *arg)
+{
+	struct intel_gt *gt = arg;
+	int ret = 0;
+	struct i915_gem_context *ctx;
+	struct intel_context *ce;
+	struct igt_spinner spin;
+	struct i915_request *rq;
+	intel_wakeref_t wakeref;
+	struct i915_gpu_error *global = &gt->i915->gpu_error;
+	struct intel_engine_cs *engine;
+	unsigned int reset_count;
+	u32 guc_status;
+	u32 old_beat;
+
+	ctx = kernel_context(gt->i915, NULL);
+	if (IS_ERR(ctx)) {
+		pr_err("Failed get kernel context: %ld\n", PTR_ERR(ctx));
+		return PTR_ERR(ctx);
+	}
+
+	wakeref = intel_runtime_pm_get(gt->uncore->rpm);
+
+	ce = intel_context_create(gt->engine[BCS0]);
+	if (IS_ERR(ce)) {
+		ret = PTR_ERR(ce);
+		pr_err("Failed to create spinner request: %d\n", ret);
+		goto err;
+	}
+
+	engine = ce->engine;
+	reset_count = i915_reset_count(global);
+
+	old_beat = engine->props.heartbeat_interval_ms;
+	ret = intel_engine_set_heartbeat(engine, BEAT_INTERVAL);
+	if (ret) {
+		pr_err("Failed to boost heatbeat interval: %d\n", ret);
+		goto err;
+	}
+
+	ret = igt_spinner_init(&spin, engine->gt);
+	if (ret) {
+		pr_err("Failed to create spinner: %d\n", ret);
+		goto err;
+	}
+
+	rq = igt_spinner_create_request(&spin, ce, MI_NOOP);
+	intel_context_put(ce);
+	if (IS_ERR(rq)) {
+		ret = PTR_ERR(rq);
+		pr_err("Failed to create spinner request: %d\n", ret);
+		goto err_spin;
+	}
+
+	ret = request_add_spin(rq, &spin);
+	if (ret) {
+		i915_request_put(rq);
+		pr_err("Failed to add Spinner request: %d\n", ret);
+		goto err_spin;
+	}
+
+	ret = intel_reset_guc(gt);
+	if (ret) {
+		i915_request_put(rq);
+		pr_err("Failed to reset GuC, ret = %d\n", ret);
+		goto err_spin;
+	}
+
+	guc_status = intel_uncore_read(gt->uncore, GUC_STATUS);
+	if (!(guc_status & GS_MIA_IN_RESET)) {
+		i915_request_put(rq);
+		pr_err("GuC failed to reset: status = 0x%08X\n", guc_status);
+		ret = -EIO;
+		goto err_spin;
+	}
+
+	/* Wait for the heartbeat to cause a reset */
+	ret = intel_selftest_wait_for_rq(rq);
+	i915_request_put(rq);
+	if (ret) {
+		pr_err("Request failed to complete: %d\n", ret);
+		goto err_spin;
+	}
+
+	if (i915_reset_count(global) == reset_count) {
+		pr_err("Failed to record a GPU reset\n");
+		ret = -EINVAL;
+		goto err_spin;
+	}
+
+err_spin:
+	igt_spinner_end(&spin);
+	igt_spinner_fini(&spin);
+	intel_engine_set_heartbeat(engine, old_beat);
+
+	if (ret == 0) {
+		rq = nop_request(engine);
+		if (IS_ERR(rq)) {
+			ret = PTR_ERR(rq);
+			goto err;
+		}
+
+		ret = intel_selftest_wait_for_rq(rq);
+		i915_request_put(rq);
+		if (ret) {
+			pr_err("No-op failed to complete: %d\n", ret);
+			goto err;
+		}
+	}
+
+err:
+	intel_runtime_pm_put(gt->uncore->rpm, wakeref);
+	kernel_context_close(ctx);
+
+	return ret;
+}
+
+int intel_guc_hang_check(struct drm_i915_private *i915)
+{
+	static const struct i915_subtest tests[] = {
+		SUBTEST(intel_hang_guc),
+	};
+	struct intel_gt *gt = to_gt(i915);
+
+	if (intel_gt_is_wedged(gt))
+		return 0;
+
+	if (!intel_uc_uses_guc_submission(&gt->uc))
+		return 0;
+
+	return intel_gt_live_subtests(tests, gt);
+}
diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index bdd290f2bf3cd..aaf8a380e5c78 100644
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -49,5 +49,6 @@ selftest(perf, i915_perf_live_selftests)
 selftest(slpc, intel_slpc_live_selftests)
 selftest(guc, intel_guc_live_selftests)
 selftest(guc_multi_lrc, intel_guc_multi_lrc_live_selftests)
+selftest(guc_hang, intel_guc_hang_check)
 /* Here be dragons: keep last to run last! */
 selftest(late_gt_pm, intel_gt_pm_late_selftests)
-- 
2.36.0