+ if (req_freq < (min_freq - 50/3)) {
+ pr_err("SWReq is %d, should be at least %d\n",
req_freq,
+ min_freq - 50/3);
+ igt_spinner_end(&spin);
+ st_engine_heartbeat_enable(engine);
+ err = -EINVAL;
+ break;
+ }
+
+ act_freq = intel_rps_read_actual_frequency(rps);
+ if (act_freq > max_act_freq)
+ max_act_freq = act_freq;
+
+ igt_spinner_end(&spin);
+ st_engine_heartbeat_enable(engine);
+ }
+
+ pr_info("Max actual frequency for %s was %d\n",
+ engine->name, max_act_freq);
+
+ /* Actual frequency should rise above min */
+ if (max_act_freq == slpc_min_freq) {
+ pr_err("Actual freq did not rise above min\n");
+ err = -EINVAL;
+ }
+
+ if (err)
+ break;
+ }
+
+ /* Restore min/max frequencies */
+ slpc_set_max_freq(slpc, slpc_max_freq);
+ slpc_set_min_freq(slpc, slpc_min_freq);
+
+ if (igt_flush_test(gt->i915))
+ err = -EIO;
+
+ intel_gt_pm_put(gt);
+ igt_spinner_fini(&spin);
+ intel_gt_pm_wait_for_idle(gt);
+
+ return err;
+}
+
+int live_slpc_clamp_max(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct intel_gt *gt = &i915->gt;
+ struct intel_guc_slpc *slpc;
+ struct intel_rps *rps;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ struct igt_spinner spin;
+ int err = 0;
+ u32 slpc_min_freq, slpc_max_freq;
+
+ slpc = >->uc.guc.slpc;
+ rps = >->rps;
+
+ if (!intel_uc_uses_guc_slpc(>->uc))
+ return 0;
+
+ if (igt_spinner_init(&spin, gt))
+ return -ENOMEM;
+
+ if (intel_guc_slpc_get_max_freq(slpc, &slpc_max_freq)) {
+ pr_err("Could not get SLPC max freq\n");
+ return -EIO;
+ }
+
+ if (intel_guc_slpc_get_min_freq(slpc, &slpc_min_freq)) {
+ pr_err("Could not get SLPC min freq\n");
+ return -EIO;
+ }
+
+ if (slpc_min_freq == slpc_max_freq) {
+ pr_err("Min/Max are fused to the same value\n");
+ return -EINVAL;
+ }
+
+ intel_gt_pm_wait_for_idle(gt);
+ intel_gt_pm_get(gt);
+ for_each_engine(engine, gt, id) {
+ struct i915_request *rq;
+ u32 max_freq, req_freq;
+ u32 act_freq, max_act_freq;
+ u32 step;
+
+ if (!intel_engine_can_store_dword(engine))
+ continue;
+
+ /* Go from max to min in 5 steps */
+ step = (slpc_max_freq - slpc_min_freq) / NUM_STEPS;
+ max_act_freq = slpc_min_freq;
+ for (max_freq = slpc_max_freq; max_freq > slpc_min_freq;
+ max_freq -= step) {
+ err = slpc_set_max_freq(slpc, max_freq);
+ if (err)
+ break;
+
+ st_engine_heartbeat_disable(engine);
+
+ rq = igt_spinner_create_request(&spin,
+ engine->kernel_context,
+ MI_NOOP);
+ if (IS_ERR(rq)) {
+ st_engine_heartbeat_enable(engine);
+ err = PTR_ERR(rq);
+ break;
+ }
+
+ i915_request_add(rq);
+
+ if (!igt_wait_for_spinner(&spin, rq)) {
+ pr_err("%s: SLPC spinner did not start\n",
+ engine->name);
+ igt_spinner_end(&spin);
+ st_engine_heartbeat_enable(engine);
+ intel_gt_set_wedged(engine->gt);
+ err = -EIO;
+ break;
+ }
+
+ delay_for_h2g();
+
+ /* Verify that SWREQ indeed was set to specific value */
+ req_freq = intel_rps_read_punit_req_frequency(rps);
+
+ /* GuC requests freq in multiples of 50/3 MHz */
+ if (req_freq > (max_freq + 50/3)) {
+ pr_err("SWReq is %d, should be at most %d\n",
req_freq,
+ max_freq + 50/3);
+ igt_spinner_end(&spin);
+ st_engine_heartbeat_enable(engine);
+ err = -EINVAL;
+ break;
+ }
+
+ act_freq = intel_rps_read_actual_frequency(rps);
+ if (act_freq > max_act_freq)
+ max_act_freq = act_freq;
+
+ st_engine_heartbeat_enable(engine);
+ igt_spinner_end(&spin);
+
+ if (err)
+ break;
+ }
+
+ pr_info("Max actual frequency for %s was %d\n",
+ engine->name, max_act_freq);
+
+ /* Actual frequency should rise above min */
+ if (max_act_freq == slpc_min_freq) {
+ pr_err("Actual freq did not rise above min\n");
+ err = -EINVAL;
+ }
+
+ if (igt_flush_test(gt->i915)) {
+ err = -EIO;
+ break;
+ }
+
+ if (err)
+ break;
+ }
+
+ /* Restore min/max freq */
+ slpc_set_max_freq(slpc, slpc_max_freq);
+ slpc_set_min_freq(slpc, slpc_min_freq);
+
+ intel_gt_pm_put(gt);
+ igt_spinner_fini(&spin);
+ intel_gt_pm_wait_for_idle(gt);
+
+ return err;
+}
+
+int intel_slpc_live_selftests(struct drm_i915_private *i915)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(live_slpc_clamp_max),
+ SUBTEST(live_slpc_clamp_min),
+ };
+
+ if (intel_gt_is_wedged(&i915->gt))
+ return 0;
+
+ return i915_live_subtests(tests, i915);
+}
diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index e2fd1b61af71..1746a56dda06 100644
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -47,5 +47,6 @@ selftest(hangcheck, intel_hangcheck_live_selftests)
selftest(execlists, intel_execlists_live_selftests)
selftest(ring_submission, intel_ring_submission_live_selftests)
selftest(perf, i915_perf_live_selftests)
+selftest(slpc, intel_slpc_live_selftests)
/* Here be dragons: keep last to run last! */
selftest(late_gt_pm, intel_gt_pm_late_selftests)
--
2.25.0
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