Tests that exercise the SLPC get/set frequency interfaces.
Clamp_max will set max frequency to multiple levels and check
that SLPC requests frequency lower than or equal to it.
Clamp_min will set min frequency to different levels and check
if SLPC requests are higher or equal to those levels.
v2: Address review comments (Michal W)
v3: Checkpatch() corrections
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_rps.c | 1 +
drivers/gpu/drm/i915/gt/selftest_slpc.c | 311 ++++++++++++++++++
drivers/gpu/drm/i915/gt/selftest_slpc.h | 12 +
.../drm/i915/selftests/i915_live_selftests.h | 1 +
4 files changed, 325 insertions(+)
create mode 100644 drivers/gpu/drm/i915/gt/selftest_slpc.c
create mode 100644 drivers/gpu/drm/i915/gt/selftest_slpc.h
diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index 48d4147165a9..6237332835fe 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -2318,4 +2318,5 @@ EXPORT_SYMBOL_GPL(i915_gpu_turbo_disable);
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftest_rps.c"
+#include "selftest_slpc.c"
#endif
diff --git a/drivers/gpu/drm/i915/gt/selftest_slpc.c b/drivers/gpu/drm/i915/gt/selftest_slpc.c
new file mode 100644
index 000000000000..5018f686686f
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/selftest_slpc.c
@@ -0,0 +1,311 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021 Intel Corporation
+ */
+
+#include "selftest_slpc.h"
+
+#define NUM_STEPS 5
+#define H2G_DELAY 50000
+#define delay_for_h2g() usleep_range(H2G_DELAY, H2G_DELAY + 10000)
+
+static int set_min_freq(struct intel_guc_slpc *slpc, u32 freq)
+{
+ int ret;
+
+ ret = intel_guc_slpc_set_min_freq(slpc, freq);
+ if (ret)
+ pr_err("Could not set min frequency to [%u]\n", freq);
+ else /* Delay to ensure h2g completes */
+ delay_for_h2g();
+
+ return ret;
+}
+
+static int set_max_freq(struct intel_guc_slpc *slpc, u32 freq)
+{
+ int ret;
+
+ ret = intel_guc_slpc_set_max_freq(slpc, freq);
+ if (ret)
+ pr_err("Could not set maximum frequency [%u]\n",
+ freq);
+ else /* Delay to ensure h2g completes */
+ delay_for_h2g();
+
+ return ret;
+}
+
+int live_slpc_clamp_min(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct intel_gt *gt = &i915->gt;
+ struct intel_guc_slpc *slpc = >->uc.guc.slpc;
+ struct intel_rps *rps = >->rps;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ struct igt_spinner spin;
+ u32 slpc_min_freq, slpc_max_freq;
+ int err = 0;
+
+ 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 step, min_freq, req_freq;
+ u32 act_freq, max_act_freq;
+
+ if (!intel_engine_can_store_dword(engine))
+ continue;
+
+ /* Go from min to max in 5 steps */
+ step = (slpc_max_freq - slpc_min_freq) / NUM_STEPS;
+ max_act_freq = slpc_min_freq;
+ for (min_freq = slpc_min_freq; min_freq < slpc_max_freq;
+ min_freq += step) {
+ err = set_min_freq(slpc, min_freq);
+ if (err)
+ break;
+
+ st_engine_heartbeat_disable(engine);
+
+ rq = igt_spinner_create_request(&spin,
+ engine->kernel_context,
+ MI_NOOP);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ st_engine_heartbeat_enable(engine);
+ break;
+ }
+
+ i915_request_add(rq);
+
+ if (!igt_wait_for_spinner(&spin, rq)) {
+ pr_err("%s: 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;
+ }
+
+ /* Wait for GuC to detect business and raise
+ * requested frequency if necessary.
+ */
+ delay_for_h2g();
+
+ req_freq = intel_rps_read_punit_req_frequency(rps);
+
+ /* GuC requests freq in multiples of 50/3 MHz */
+ 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 */
+ set_max_freq(slpc, slpc_max_freq);
+ 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)
+{
