Simple tests for validating the PMU implementation for GT C6
residencies.
v2: Rename rc6-residency-* to gt-c6-residency and remove freq tests.
v3: Keep just gt-c6 tests, add frequency tests later.
v4: Review comments (Riana)
v5: Review comments (Lucas)
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Cc: Riana Tauro <riana.tauro@xxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
---
tests/intel/xe_pmu.c | 149 +++++++++++++++++++++++++++++++++++++++++++
tests/meson.build | 1 +
2 files changed, 150 insertions(+)
create mode 100644 tests/intel/xe_pmu.c
diff --git a/tests/intel/xe_pmu.c b/tests/intel/xe_pmu.c
new file mode 100644
index 000000000..44589cb86
--- /dev/null
+++ b/tests/intel/xe_pmu.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+/**
+ * TEST: Test Xe PMU functionality
+ * Category: Perf Monitoring Unit
+ * Mega feature: Perf Monitoring Unit
+ * Sub-category: Telemetry
+ * Functionality: Power/Perf
+ * Test category: Functional tests
+ */
+
+#include <fcntl.h>
+#include <limits.h>
+#include <time.h>
+#include <errno.h>
+#include <dirent.h>
+#include <string.h>
+#include <sys/time.h>
+
+#include "igt.h"
+#include "igt_device.h"
+#include "igt_power.h"
+#include "igt_sysfs.h"
+#include "igt_perf.h"
+
+#include "lib/igt_syncobj.h"
+#include "xe/xe_ioctl.h"
+#include "xe/xe_gt.h"
+#include "xe/xe_query.h"
+#include "xe/xe_spin.h"
+#include "xe/xe_util.h"
+
+#define SLEEP_DURATION 2 /* in seconds */
+const double tolerance = 0.1;
+const char *no_debug_data = "\0";
+
+static int open_pmu(int xe, uint64_t config)
+{
+ int fd;
+
+ fd = perf_xe_open(xe, config);
+ igt_skip_on(fd < 0 && errno == ENODEV);
+ igt_assert(fd >= 0);
+
+ return fd;
+}
+
+static uint64_t __pmu_read_single(int fd, uint64_t *ts)
+{
+ uint64_t data[2];
+
+ igt_assert_eq(read(fd, data, sizeof(data)), sizeof(data));
+ if (ts)
+ *ts = data[1];
+
+ return data[0];
+}
+
+static unsigned long read_idle_residency(int fd, int gt)
+{
+ unsigned long residency = 0;
+ int gt_fd;
+
+ gt_fd = xe_sysfs_gt_open(fd, gt);
+ igt_assert(gt_fd >= 0);
+ igt_assert(igt_sysfs_scanf(gt_fd, "gtidle/idle_residency_ms", "%lu", &residency) == 1);
+ close(gt_fd);
+
+ return residency;
+}
+
+static u64 get_event_config(int xe, unsigned int gt, char *event)
+{
+ int ret;
+ char xe_device[100];
+ u64 pmu_config;
+ u32 start, end;
+
+ xe_perf_device(xe, xe_device, sizeof(xe_device));
+ ret = perf_event_config(xe_device, event, &pmu_config);
+ igt_assert(ret >= 0);
+ ret = perf_event_format(xe_device, "gt", &start, &end);
+ igt_assert(ret >= 0);
+ pmu_config |= (u64) gt << start;
+
+ return pmu_config;
+}
+
+/**
+ * SUBTEST: gt-c6-idle
+ * Description: Basic residency test to validate idle residency
+ * measured over a time interval is within the tolerance
+ */
+static void test_gt_c6_idle(int xe, unsigned int gt)
+{
+ int pmu_fd;
+ u64 pmu_config;
+ char event[100];
+ uint64_t ts[2];
+ unsigned long slept, start, end;
+ uint64_t val;
+
+ /* Get the PMU config for the gt-c6 event */
+ sprintf(event, "gt-c6-residency");
+ pmu_config = get_event_config(xe, gt, event);
+
+ pmu_fd = open_pmu(xe, pmu_config);
+
+ igt_require_f(igt_wait(xe_gt_is_in_c6(xe, gt), 1000, 10), "GT %d should be in C6\n", gt);
+
+ /* While idle check full RC6. */
+ start = read_idle_residency(xe, gt);
+ val = __pmu_read_single(pmu_fd, &ts[0]);
+ slept = igt_measured_usleep(SLEEP_DURATION * USEC_PER_SEC) / 1000;
+ end = read_idle_residency(xe, gt);
+ val = __pmu_read_single(pmu_fd, &ts[1]) - val;
+
+ igt_debug("gt%u: slept=%lu, perf=%"PRIu64"\n",
+ gt, slept, val);
+
+ igt_debug("Start res: %lu, end_res: %lu", start, end);
+
+ assert_within_epsilon(val,
+ (ts[1] - ts[0])/USEC_PER_SEC,
+ tolerance);
+ close(pmu_fd);
+}
+
+igt_main
+{
+ int fd, gt;
+
+ igt_fixture {
+ fd = drm_open_driver(DRIVER_XE);
+ igt_require(!IS_PONTEVECCHIO(xe_dev_id(fd)));
+ }
+
+ igt_describe("Validate PMU gt-c6 residency counters when idle");
+ igt_subtest("gt-c6-idle")
+ xe_for_each_gt(fd, gt)
+ test_gt_c6_idle(fd, gt);
+
+ igt_fixture {
+ close(fd);
+ }
+}
diff --git a/tests/meson.build b/tests/meson.build
index 33dffad31..d20f50766 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -309,6 +309,7 @@ intel_xe_progs = [
'xe_pat',
'xe_peer2peer',
'xe_pm',
+ 'xe_pmu',
'xe_pm_residency',
'xe_prime_self_import',
'xe_query',
--
2.38.1
