[PATCH i-g-t 5/7] tests/perf_pmu: Tests for i915 PMU API

[Tvrtko Ursulin <tursulin@ursulin.net>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

A bunch of tests for the new i915 PMU feature.

Parts of the code were initialy sketched by Dmitry Rogozhkin.

v2: (Most suggestions by Chris Wilson)
 * Add new class/instance based engine list.
 * Add gem_has_engine/gem_require_engine to work with class/instance.
 * Use the above two throughout the test.
 * Shorten tests to 100ms busy batches, seems enough.
 * Add queued counter sanity checks.
 * Use igt_nsec_elapsed.
 * Skip on perf -ENODEV in some tests instead of embedding knowledge locally.
 * Fix multi ordering for busy accounting.
 * Use new guranteed_usleep when sleep time is asserted on.
 * Check for no queued when idle/busy.
 * Add queued counter init test.
 * Add queued tests.
 * Consolidate and increase multiple busy engines tests to most-busy and
   all-busy tests.
 * Guarantte interrupts by using fences.
 * Test RC6 via forcewake.

v3:
 * Tweak assert in interrupts subtest.
 * Sprinkle of comments.
 * Fix multi-client test which got broken in v2.

v4:
 * Measured instead of guaranteed sleep.
 * Missing sync in no_sema.
 * Log busyness before asserts for debug.
 * access(2) instead of open(2) to determine if cpu0 is hotpluggable.
 * Test frequency reporting via min/max setting instead assuming.
   ^^ All above suggested by Chris Wilson. ^^
 * Drop queued subtests to match i915.
 * Use long batches with fences to ensure interrupts.
 * Test render node as well.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
---
 lib/igt_gt.c           |  50 +++
 lib/igt_gt.h           |  38 ++
 lib/igt_perf.h         |   9 +-
 tests/Makefile.am      |   1 +
 tests/Makefile.sources |   1 +
 tests/perf_pmu.c       | 957 +++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 1048 insertions(+), 8 deletions(-)
 create mode 100644 tests/perf_pmu.c

diff --git a/lib/igt_gt.c b/lib/igt_gt.c
index b3f3b3809eee..4c75811fb1b3 100644
--- a/lib/igt_gt.c
+++ b/lib/igt_gt.c
@@ -568,3 +568,53 @@ bool gem_can_store_dword(int fd, unsigned int engine)
 
 	return true;
 }
+
+const struct intel_execution_engine2 intel_execution_engines2[] = {
+	{ "rcs0", I915_ENGINE_CLASS_RENDER, 0 },
+	{ "bcs0", I915_ENGINE_CLASS_COPY, 0 },
+	{ "vcs0", I915_ENGINE_CLASS_VIDEO, 0 },
+	{ "vcs1", I915_ENGINE_CLASS_VIDEO, 1 },
+	{ "vecs0", I915_ENGINE_CLASS_VIDEO_ENHANCE, 0 },
+};
+
+unsigned int
+gem_class_instance_to_eb_flags(int gem_fd,
+			       enum drm_i915_gem_engine_class class,
+			       unsigned int instance)
+{
+	if (class != I915_ENGINE_CLASS_VIDEO)
+		igt_assert(instance == 0);
+	else
+		igt_assert(instance >= 0 && instance <= 1);
+
+	switch (class) {
+	case I915_ENGINE_CLASS_RENDER:
+		return I915_EXEC_RENDER;
+	case I915_ENGINE_CLASS_COPY:
+		return I915_EXEC_BLT;
+	case I915_ENGINE_CLASS_VIDEO:
+		if (instance == 0) {
+			if (gem_has_bsd2(gem_fd))
+				return I915_EXEC_BSD | I915_EXEC_BSD_RING1;
+			else
+				return I915_EXEC_BSD;
+
+		} else {
+			return I915_EXEC_BSD | I915_EXEC_BSD_RING2;
+		}
+	case I915_ENGINE_CLASS_VIDEO_ENHANCE:
+		return I915_EXEC_VEBOX;
+	case I915_ENGINE_CLASS_OTHER:
+	default:
+		igt_assert(0);
+	};
+}
+
+bool gem_has_engine(int gem_fd,
+		    enum drm_i915_gem_engine_class class,
+		    unsigned int instance)
+{
+	return gem_has_ring(gem_fd,
+			    gem_class_instance_to_eb_flags(gem_fd, class,
+							   instance));
+}
diff --git a/lib/igt_gt.h b/lib/igt_gt.h
index 2579cbd37be7..fb67ae1a7d1f 100644
--- a/lib/igt_gt.h
+++ b/lib/igt_gt.h
@@ -25,6 +25,7 @@
 #define IGT_GT_H
 
 #include "igt_debugfs.h"
+#include "igt_core.h"
 
 void igt_require_hang_ring(int fd, int ring);
 
@@ -80,4 +81,41 @@ extern const struct intel_execution_engine {
 
 bool gem_can_store_dword(int fd, unsigned int engine);
 
+extern const struct intel_execution_engine2 {
+	const char *name;
+	int class;
+	int instance;
+} intel_execution_engines2[];
+
+#define for_each_engine_class_instance(fd__, e__) \
+	for ((e__) = intel_execution_engines2;\
+	     (e__)->name; \
+	     (e__)++)
+
+enum drm_i915_gem_engine_class {
+	I915_ENGINE_CLASS_OTHER = 0,
+	I915_ENGINE_CLASS_RENDER = 1,
+	I915_ENGINE_CLASS_COPY = 2,
+	I915_ENGINE_CLASS_VIDEO = 3,
+	I915_ENGINE_CLASS_VIDEO_ENHANCE = 4,
+	I915_ENGINE_CLASS_MAX /* non-ABI */
+};
+
+unsigned int
+gem_class_instance_to_eb_flags(int gem_fd,
+			       enum drm_i915_gem_engine_class class,
+			       unsigned int instance);
+
+bool gem_has_engine(int gem_fd,
+		    enum drm_i915_gem_engine_class class,
+		    unsigned int instance);
+
+static inline
+void gem_require_engine(int gem_fd,
+			enum drm_i915_gem_engine_class class,
+			unsigned int instance)
+{
+	igt_require(gem_has_engine(gem_fd, class, instance));
+}
+
 #endif /* IGT_GT_H */
diff --git a/lib/igt_perf.h b/lib/igt_perf.h
index e38171da5261..dc4df760f531 100644
--- a/lib/igt_perf.h
+++ b/lib/igt_perf.h
@@ -29,14 +29,7 @@
 
 #include <linux/perf_event.h>
 
-enum drm_i915_gem_engine_class {
-	I915_ENGINE_CLASS_OTHER = 0,
-	I915_ENGINE_CLASS_RENDER = 1,
-	I915_ENGINE_CLASS_COPY = 2,
-	I915_ENGINE_CLASS_VIDEO = 3,
-	I915_ENGINE_CLASS_VIDEO_ENHANCE = 4,
-	I915_ENGINE_CLASS_MAX /* non-ABI */
-};
+#include "igt_gt.h"
 
 enum drm_i915_pmu_engine_sample {
 	I915_SAMPLE_BUSY = 0,
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 1cea4036d00f..2819df381df7 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -126,6 +126,7 @@ gen7_forcewake_mt_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
 gen7_forcewake_mt_LDADD = $(LDADD) -lpthread
 gem_userptr_blits_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
 gem_userptr_blits_LDADD = $(LDADD) -lpthread
+perf_pmu_LDADD = $(LDADD) $(top_builddir)/lib/libigt_perf.la
 
 gem_wait_LDADD = $(LDADD) -lrt
 kms_flip_LDADD = $(LDADD) -lrt -lpthread
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 0adc28a014d2..7d1fdf16892d 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -217,6 +217,7 @@ TESTS_progs = \
 	kms_vblank \
 	meta_test \
 	perf \
+	perf_pmu \
 	pm_backlight \
 	pm_lpsp \
 	pm_rc6_residency \
diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
new file mode 100644
index 000000000000..70d435e953ea
--- /dev/null
+++ b/tests/perf_pmu.c
@@ -0,0 +1,957 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <time.h>
+#include <poll.h>
+
+#include "igt.h"
+#include "igt_core.h"
+#include "igt_perf.h"
+#include "igt_sysfs.h"
+
+IGT_TEST_DESCRIPTION("Test the i915 pmu perf interface");
+
+const double tolerance = 0.02f;
+const unsigned long batch_duration_ns = 100 * 1000 * 1000;
+
+static int open_pmu(uint64_t config)
+{
+	int fd;
+
+	fd = perf_i915_open(config);
+	igt_require(fd >= 0 || (fd < 0 && errno != ENODEV));
+	igt_assert(fd >= 0);
+
+	return fd;
+}
+
+static int open_group(uint64_t config, int group)
+{
+	int fd;
+
+	fd = perf_i915_open_group(config, group);
+	igt_require(fd >= 0 || (fd < 0 && errno != ENODEV));
+	igt_assert(fd >= 0);
+
+	return fd;
+}
+
+static void
+init(int gem_fd, const struct intel_execution_engine2 *e, uint8_t sample)
+{
+	int fd;
+
+	fd = open_pmu(__I915_PMU_ENGINE(e->class, e->instance, sample));
+
+	close(fd);
+}
+
+static uint64_t pmu_read_single(int fd)
+{
+	uint64_t data[2];
+
+	igt_assert_eq(read(fd, data, sizeof(data)), sizeof(data));
+
+	return data[0];
+}
+
+static void pmu_read_multi(int fd, unsigned int num, uint64_t *val)
+{
+	uint64_t buf[2 + num];
+	unsigned int i;
+
+	igt_assert_eq(read(fd, buf, sizeof(buf)), sizeof(buf));
+
+	for (i = 0; i < num; i++)
+		val[i] = buf[2 + i];
+}
+
+#define assert_within_epsilon(x, ref, tolerance) \
+	igt_assert_f((double)(x) <= (1.0 + tolerance) * (double)ref && \
+		     (double)(x) >= (1.0 - tolerance) * (double)ref, \
+		     "'%s' != '%s' (%f not within %f%% tolerance of %f)\n",\
+		     #x, #ref, (double)x, tolerance * 100.0, (double)ref)
+
+/*
+ * Helper for cases where we assert on time spent sleeping (directly or
+ * indirectly), so make it more robust by ensuring the system sleep time
+ * is within test tolerance to start with.
+ */
+static unsigned int measured_usleep(unsigned int usec)
+{
+	uint64_t slept = 0;
+
+	while (usec > 0) {
+		struct timespec start = { };
+		uint64_t this_sleep;
+
+		igt_nsec_elapsed(&start);
+		usleep(usec);
+		this_sleep = igt_nsec_elapsed(&start);
+		slept += this_sleep;
+		if (this_sleep > usec * 1000)
+			break;
+		usec -= this_sleep;
+	}
+
+	return slept;
+}
+
+static unsigned int e2ring(int gem_fd, const struct intel_execution_engine2 *e)
+{
+	return gem_class_instance_to_eb_flags(gem_fd, e->class, e->instance);
+}
+
+static void
+single(int gem_fd, const struct intel_execution_engine2 *e, bool busy)
+{
+	double ref = busy ? batch_duration_ns : 0.0f;
+	igt_spin_t *spin;
+	uint64_t val;
+	int fd;
+
+	fd = open_pmu(I915_PMU_ENGINE_BUSY(e->class, e->instance));
+
+	if (busy) {
+		spin = igt_spin_batch_new(gem_fd, 0, e2ring(gem_fd, e), 0);
+		igt_spin_batch_set_timeout(spin, batch_duration_ns);
+	} else {
+		usleep(batch_duration_ns / 1000);
+	}
+
+	if (busy)
+		gem_sync(gem_fd, spin->handle);
+
+	val = pmu_read_single(fd);
+
+	assert_within_epsilon(val, ref, tolerance);
+
+	if (busy)
+		igt_spin_batch_free(gem_fd, spin);
+	close(fd);
+}
+
+static void log_busy(int fd, unsigned int num_engines, uint64_t *val)
+{
+	char buf[1024];
+	int rem = sizeof(buf);
+	unsigned int i;
+	char *p = buf;
+
+	for (i = 0; i < num_engines; i++) {
+		int len;
+
+		len = snprintf(p, rem, "%u=%" PRIu64 "\n",  i, val[i]);
+		igt_assert(len > 0);
+		rem -= len;
+		p += len;
+	}
+
+	igt_info("%s", buf);
+}
+
+static void
+busy_check_all(int gem_fd, const struct intel_execution_engine2 *e,
+	       const unsigned int num_engines)
+{
+	const struct intel_execution_engine2 *e_;
+	uint64_t val[num_engines];
+	int fd[num_engines];
+	igt_spin_t *spin;
+	unsigned int busy_idx, i;
+
+	i = 0;
+	fd[0] = -1;
+	for_each_engine_class_instance(fd, e_) {
+		if (!gem_has_engine(gem_fd, e_->class, e_->instance))
+			continue;
+		else if (e == e_)
+			busy_idx = i;
+
+		fd[i++] = open_group(I915_PMU_ENGINE_BUSY(e_->class,
+							  e_->instance),
+				     fd[0]);
+	}
+
+	spin = igt_spin_batch_new(gem_fd, 0, e2ring(gem_fd, e), 0);
+	igt_spin_batch_set_timeout(spin, batch_duration_ns);
+
+	gem_sync(gem_fd, spin->handle);
+
+	pmu_read_multi(fd[0], num_engines, val);
+	log_busy(fd[0], num_engines, val);
+
+	assert_within_epsilon(val[busy_idx], batch_duration_ns, tolerance);
+	for (i = 0; i < num_engines; i++) {
+		if (i == busy_idx)
+			continue;
+		assert_within_epsilon(val[i], 0.0f, tolerance);
+	}
+
+	igt_spin_batch_free(gem_fd, spin);
+	close(fd[0]);
+}
+
+static void
+most_busy_check_all(int gem_fd, const struct intel_execution_engine2 *e,
+		    const unsigned int num_engines)
+{
+	const struct intel_execution_engine2 *e_;
+	uint64_t val[num_engines];
+	int fd[num_engines];
+	igt_spin_t *spin[num_engines];
+	unsigned int idle_idx, i;
+
+	gem_require_engine(gem_fd, e->class, e->instance);
+
+	i = 0;
+	fd[0] = -1;
+	for_each_engine_class_instance(fd, e_) {
+		if (!gem_has_engine(gem_fd, e_->class, e_->instance))
+			continue;
+
+		fd[i] = open_group(I915_PMU_ENGINE_BUSY(e_->class,
+							e_->instance),
+				   fd[0]);
+
+		if (e == e_) {
+			idle_idx = i;
+		} else {
+			spin[i] = igt_spin_batch_new(gem_fd, 0,
+						     e2ring(gem_fd, e_), 0);
+			igt_spin_batch_set_timeout(spin[i], batch_duration_ns);
+		}
+
+		i++;
+	}
+
+	for (i = 0; i < num_engines; i++) {
+		if (i != idle_idx)
+			gem_sync(gem_fd, spin[i]->handle);
+	}
+
+	pmu_read_multi(fd[0], num_engines, val);
+	log_busy(fd[0], num_engines, val);
+
+	for (i = 0; i < num_engines; i++) {
+		if (i == idle_idx)
+			assert_within_epsilon(val[i], 0.0f, tolerance);
+		else
+			assert_within_epsilon(val[i], batch_duration_ns,
+					      tolerance);
+	}
+
+	for (i = 0; i < num_engines; i++) {
+		if (i != idle_idx)
+			igt_spin_batch_free(gem_fd, spin[i]);
+	}
+	close(fd[0]);
+}
+
+static void
+all_busy_check_all(int gem_fd, const unsigned int num_engines)
+{
+	const struct intel_execution_engine2 *e;
+	uint64_t val[num_engines];
+	int fd[num_engines];
+	igt_spin_t *spin[num_engines];
+	unsigned int i;
+
+	i = 0;
+	fd[0] = -1;
+	for_each_engine_class_instance(fd, e) {
+		if (!gem_has_engine(gem_fd, e->class, e->instance))
+			continue;
+
+		fd[i] = open_group(I915_PMU_ENGINE_BUSY(e->class, e->instance),
+				   fd[0]);
+
+		spin[i] = igt_spin_batch_new(gem_fd, 0, e2ring(gem_fd, e), 0);
+		igt_spin_batch_set_timeout(spin[i], batch_duration_ns);
+
+		i++;
+	}
+
+	for (i = 0; i < num_engines; i++)
+		gem_sync(gem_fd, spin[i]->handle);
+
+	pmu_read_multi(fd[0], num_engines, val);
+	log_busy(fd[0], num_engines, val);
+
+	for (i = 0; i < num_engines; i++)
+		assert_within_epsilon(val[i], batch_duration_ns, tolerance);
+
+	for (i = 0; i < num_engines; i++)
+		igt_spin_batch_free(gem_fd, spin[i]);
+	close(fd[0]);
+}
+
+static void
+no_sema(int gem_fd, const struct intel_execution_engine2 *e, bool busy)
+{
+	igt_spin_t *spin;
+	uint64_t val[2];
+	int fd;
+
+	fd = open_group(I915_PMU_ENGINE_SEMA(e->class, e->instance), -1);
+	open_group(I915_PMU_ENGINE_WAIT(e->class, e->instance), fd);
+
+	if (busy) {
+		spin = igt_spin_batch_new(gem_fd, 0, e2ring(gem_fd, e), 0);
+		igt_spin_batch_set_timeout(spin, batch_duration_ns);
+	} else {
+		usleep(batch_duration_ns / 1000);
+	}
+
+	if (busy)
+		gem_sync(gem_fd, spin->handle);
+
+	pmu_read_multi(fd, 2, val);
+
+	assert_within_epsilon(val[0], 0.0f, tolerance);
+	assert_within_epsilon(val[1], 0.0f, tolerance);
+
+	if (busy)
+		igt_spin_batch_free(gem_fd, spin);
+	close(fd);
+}
+
+static void
+multi_client(int gem_fd, const struct intel_execution_engine2 *e)
+{
+	uint64_t config = I915_PMU_ENGINE_BUSY(e->class, e->instance);
+	unsigned int slept;
+	igt_spin_t *spin;
+	uint64_t val[2];
+	int fd[2];
+
+	fd[0] = open_pmu(config);
+
+	spin = igt_spin_batch_new(gem_fd, 0, e2ring(gem_fd, e), 0);
+	igt_spin_batch_set_timeout(spin, batch_duration_ns);
+
+	usleep(batch_duration_ns / 3000);
+
+	/*
+	 * Second PMU client which is initialized after the first one,
+	 * and exists before it, should not affect accounting as reported
+	 * in the first client.
+	 */
+	fd[1] = open_pmu(config);
+	slept = measured_usleep(batch_duration_ns / 3000);
+	val[1] = pmu_read_single(fd[1]);
+	close(fd[1]);
+
+	gem_sync(gem_fd, spin->handle);
+
+	val[0] = pmu_read_single(fd[0]);
+
+	assert_within_epsilon(val[0], batch_duration_ns, tolerance);
+	assert_within_epsilon(val[1], slept, tolerance);
+
+	igt_spin_batch_free(gem_fd, spin);
+	close(fd[0]);
+}
+
+/**
+ * Tests that i915 PMU corectly errors out in invalid initialization.
+ * i915 PMU is uncore PMU, thus:
+ *  - sampling period is not supported
+ *  - pid > 0 is not supported since we can't count per-process (we count
+ *    per whole system)
+ *  - cpu != 0 is not supported since i915 PMU exposes cpumask for CPU0
+ */
+static void invalid_init(void)
+{
+	struct perf_event_attr attr;
+	int pid, cpu;
+
+#define ATTR_INIT() \
+do { \
+	memset(&attr, 0, sizeof (attr)); \
+	attr.config = I915_PMU_ENGINE_BUSY(I915_ENGINE_CLASS_RENDER, 0); \
+	attr.type = i915_type_id(); \
+	igt_assert(attr.type != 0); \
+} while(0)
+
+	ATTR_INIT();
+	attr.sample_period = 100;
+	pid = -1;
+	cpu = 0;
+	igt_assert_eq(perf_event_open(&attr, pid, cpu, -1, 0), -1);
+	igt_assert_eq(errno, EINVAL);
+
+	ATTR_INIT();
+	pid = 0;
+	cpu = 0;
+	igt_assert_eq(perf_event_open(&attr, pid, cpu, -1, 0), -1);
+	igt_assert_eq(errno, EINVAL);
+
+	ATTR_INIT();
+	pid = -1;
+	cpu = 1;
+	igt_assert_eq(perf_event_open(&attr, pid, cpu, -1, 0), -1);
+	igt_assert_eq(errno, ENODEV);
+}
+
+static void init_other(unsigned int i, bool valid)
+{
+	int fd;
+
+	fd = perf_i915_open(__I915_PMU_OTHER(i));
+	igt_require(!(fd < 0 && errno == ENODEV));
+	if (valid) {
+		igt_assert(fd >= 0);
+	} else {
+		igt_assert(fd < 0);
+		return;
+	}
+
+	close(fd);
+}
+
+static void read_other(unsigned int i, bool valid)
+{
+	int fd;
+
+	fd = perf_i915_open(__I915_PMU_OTHER(i));
+	igt_require(!(fd < 0 && errno == ENODEV));
+	if (valid) {
+		igt_assert(fd >= 0);
+	} else {
+		igt_assert(fd < 0);
+		return;
+	}
+
+	(void)pmu_read_single(fd);
+
+	close(fd);
+}
+
+static bool cpu0_hotplug_support(void)
+{
+	return access("/sys/devices/system/cpu/cpu0/online", W_OK) == 0;
+}
+
+static void cpu_hotplug(int gem_fd)
+{
+	struct timespec start = { };
+	igt_spin_t *spin;
+	uint64_t val, ref;
+	int fd;
+
+	igt_require(cpu0_hotplug_support());
+
+	spin = igt_spin_batch_new(gem_fd, 0, I915_EXEC_RENDER, 0);
+	fd = perf_i915_open(I915_PMU_ENGINE_BUSY(I915_ENGINE_CLASS_RENDER, 0));
+	igt_assert(fd >= 0);
+
+	igt_nsec_elapsed(&start);
+
+	/*
+	 * Toggle online status of all the CPUs in a child process and ensure
+	 * this has not affected busyness stats in the parent.
+	 */
+	igt_fork(child, 1) {
+		int cpu = 0;
+
+		for (;;) {
+			char name[128];
+			int cpufd;
+
+			sprintf(name, "/sys/devices/system/cpu/cpu%d/online",
+				cpu);
+			cpufd = open(name, O_WRONLY);
+			if (cpufd == -1) {
+				igt_assert(cpu > 0);
+				break;
+			}
+			igt_assert_eq(write(cpufd, "0", 2), 2);
+
+			usleep(1000 * 1000);
+
+			igt_assert_eq(write(cpufd, "1", 2), 2);
+
+			close(cpufd);
+			cpu++;
+		}
+	}
+
+	igt_waitchildren();
+
+	igt_spin_batch_end(spin);
+	gem_sync(gem_fd, spin->handle);
+
+	ref = igt_nsec_elapsed(&start);
+	val = pmu_read_single(fd);
+
+	assert_within_epsilon(val, ref, tolerance);
+
+	igt_spin_batch_free(gem_fd, spin);
+	close(fd);
+}
+
+static unsigned long calibrate_nop(int fd, const unsigned int calibration_us)
+{
+	const unsigned int cal_min_us = calibration_us * 3;
+	const unsigned int tolerance_pct = 10;
+	const uint32_t bbe = 0xa << 23;
+	const unsigned int loops = 17;
+	struct drm_i915_gem_exec_object2 obj = {};
+	struct drm_i915_gem_execbuffer2 eb =
+		{ .buffer_count = 1, .buffers_ptr = (uintptr_t)&obj};
+	struct timespec t_begin = { };
+	long size, last_size;
+	unsigned long ns;
+
+	igt_nsec_elapsed(&t_begin);
+
+	size = 256 * 1024;
+	do {
+		struct timespec t_start = { };
+
+		obj.handle = gem_create(fd, size);
+		gem_write(fd, obj.handle, size - sizeof(bbe), &bbe,
+			  sizeof(bbe));
+		gem_execbuf(fd, &eb);
+		gem_sync(fd, obj.handle);
+
+		igt_nsec_elapsed(&t_start);
+
+		for (int loop = 0; loop < loops; loop++)
+			gem_execbuf(fd, &eb);
+		gem_sync(fd, obj.handle);
+
+		ns = igt_nsec_elapsed(&t_start);
+
+		gem_close(fd, obj.handle);
+
+		last_size = size;
+		size = calibration_us * 1000 * size * loops / ns;
+		size = ALIGN(size, sizeof(uint32_t));
+	} while (igt_nsec_elapsed(&t_begin) / 1000 < cal_min_us ||
+		 abs(size - last_size) > (size * tolerance_pct / 100));
+
+	return size / sizeof(uint32_t);
+}
+
+static int chain_nop(int gem_fd, unsigned long sz, int in_fence, bool sync)
+{
+	struct drm_i915_gem_exec_object2 obj = {};
+	struct drm_i915_gem_execbuffer2 eb =
+		{ .buffer_count = 1, .buffers_ptr = (uintptr_t)&obj};
+	const uint32_t bbe = 0xa << 23;
+
+	sz = ALIGN(sz, sizeof(uint32_t));
+
+	obj.handle = gem_create(gem_fd, sz);
+	gem_write(gem_fd, obj.handle, sz - sizeof(bbe), &bbe, sizeof(bbe));
+
+	eb.flags = I915_EXEC_RENDER | I915_EXEC_FENCE_OUT;
+
+	if (in_fence >= 0) {
+		eb.flags |= I915_EXEC_FENCE_IN;
+		eb.rsvd2 = in_fence;
+	}
+
+	gem_execbuf_wr(gem_fd, &eb);
+
+	if (sync)
+		gem_sync(gem_fd, obj.handle);
+
+	gem_close(gem_fd, obj.handle);
+	if (in_fence >= 0)
+		close(in_fence);
+
+	return eb.rsvd2 >> 32;
+}
+
+static void
+test_interrupts(int gem_fd)
+{
+	const unsigned int calibration_us = 250000;
+	const unsigned int batch_len_us = 100000;
+	const unsigned int batch_count = 3000000 / batch_len_us;
+	uint64_t idle, busy, prev;
+	unsigned long cal, sz;
+	int fd, fence = -1;
+	unsigned int i;
+
+	cal = calibrate_nop(gem_fd, calibration_us);
+	sz = batch_len_us * cal / calibration_us;
+
+	fd = open_pmu(I915_PMU_INTERRUPTS);
+
+	gem_quiescent_gpu(gem_fd);
+
+	/* Wait for idle state. */
+	prev = pmu_read_single(fd);
+	idle = prev + 1;
+	while (idle != prev) {
+		usleep(100000);
+		prev = idle;
+		idle = pmu_read_single(fd);
+	}
+
+	igt_assert_eq(idle - prev, 0);
+
+	/* Send some no-op batches with chained fences to ensure interrupts. */
+	for (i = 1; i <= batch_count; i++)
+		fence = chain_nop(gem_fd, sz, fence,
+				  i < batch_count ? false : true);
+
+	close(fence);
+
+	/* Check at least as many interrupts has been generated. */
+	busy = pmu_read_single(fd);
+	igt_assert(busy >= batch_count);
+
+	close(fd);
+}
+
+static void
+test_frequency(int gem_fd)
+{
+	const uint64_t duration_ns = 2000000000;
+	uint32_t min_freq, max_freq, boost_freq;
+	uint64_t min[2], max[2], start[2];
+	igt_spin_t *spin;
+	int fd, sysfs;
+
+	sysfs = igt_sysfs_open(gem_fd, NULL);
+	igt_require(sysfs >= 0);
+
+	min_freq = igt_sysfs_get_u32(sysfs, "gt_RPn_freq_mhz");
+	max_freq = igt_sysfs_get_u32(sysfs, "gt_RP0_freq_mhz");
+	boost_freq = igt_sysfs_get_u32(sysfs, "gt_boost_freq_mhz");
+	igt_require(min_freq > 0 && max_freq > 0 && boost_freq > 0);
+	igt_require(max_freq > min_freq);
+	igt_require(boost_freq > min_freq);
+
+	fd = open_group(I915_PMU_REQUESTED_FREQUENCY, -1);
+	open_group(I915_PMU_ACTUAL_FREQUENCY, fd);
+
+	/*
+	 * Set GPU to min frequency and read PMU counters.
+	 */
+	igt_require(igt_sysfs_set_u32(sysfs, "gt_max_freq_mhz", min_freq));
+	igt_require(igt_sysfs_get_u32(sysfs, "gt_max_freq_mhz") == min_freq);
+	igt_require(igt_sysfs_set_u32(sysfs, "gt_boost_freq_mhz", min_freq));
+	igt_require(igt_sysfs_get_u32(sysfs, "gt_boost_freq_mhz") == min_freq);
+
+	pmu_read_multi(fd, 2, start);
+
+	spin = igt_spin_batch_new(gem_fd, 0, I915_EXEC_RENDER, 0);
+	igt_spin_batch_set_timeout(spin, duration_ns);
+	gem_sync(gem_fd, spin->handle);
+
+	pmu_read_multi(fd, 2, min);
+	min[0] -= start[0];
+	min[1] -= start[1];
+
+	igt_spin_batch_free(gem_fd, spin);
+
+	usleep(1000000);
+
+	/*
+	 * Set GPU to max frequency and read PMU counters.
+	 */
+	igt_require(igt_sysfs_set_u32(sysfs, "gt_max_freq_mhz", max_freq));
+	igt_require(igt_sysfs_get_u32(sysfs, "gt_max_freq_mhz") == max_freq);
+	igt_require(igt_sysfs_set_u32(sysfs, "gt_boost_freq_mhz", boost_freq));
+	igt_require(igt_sysfs_get_u32(sysfs, "gt_boost_freq_mhz") == boost_freq);
+
+	igt_require(igt_sysfs_set_u32(sysfs, "gt_min_freq_mhz", max_freq));
+	igt_require(igt_sysfs_get_u32(sysfs, "gt_min_freq_mhz") == max_freq);
+
+	pmu_read_multi(fd, 2, start);
+
+	spin = igt_spin_batch_new(gem_fd, 0, I915_EXEC_RENDER, 0);
+	igt_spin_batch_set_timeout(spin, duration_ns);
+	gem_sync(gem_fd, spin->handle);
+
+	pmu_read_multi(fd, 2, max);
+	max[0] -= start[0];
+	max[1] -= start[1];
+
+	igt_spin_batch_free(gem_fd, spin);
+
+	/*
+	 * Restore min/max.
+	 */
+	igt_require(igt_sysfs_set_u32(sysfs, "gt_min_freq_mhz", min_freq));
+	igt_require(igt_sysfs_get_u32(sysfs, "gt_min_freq_mhz") == min_freq);
+
+	close(fd);
+
+	igt_assert(min[0] < max[0]);
+	igt_assert(min[1] < max[1]);
+}
+
+static void
+test_rc6(int gem_fd)
+{
+	int64_t duration_ns = 2 * 1000 * 1000 * 1000;
+	uint64_t idle, busy, prev;
+	unsigned int slept;
+	int fd, fw;
+
+	fd = open_pmu(I915_PMU_RC6_RESIDENCY);
+
+	gem_quiescent_gpu(gem_fd);
+	usleep(1000000);
+
+	/* Go idle and check full RC6. */
+	prev = pmu_read_single(fd);
+	slept = measured_usleep(duration_ns / 1000);
+	idle = pmu_read_single(fd);
+
+	assert_within_epsilon(idle - prev, slept, tolerance);
+
+	/* Wake up device and check no RC6. */
+	fw = igt_open_forcewake_handle(gem_fd);
+	igt_assert(fw >= 0);
+
+	prev = pmu_read_single(fd);
+	usleep(duration_ns / 1000);
+	busy = pmu_read_single(fd);
+
+	assert_within_epsilon(busy - prev, 0.0, tolerance);
+
+	close(fw);
+	close(fd);
+}
+
+static void
+test_rc6p(int gem_fd)
+{
+	int64_t duration_ns = 2 * 1000 * 1000 * 1000;
+	unsigned int num_pmu = 1;
+	uint64_t idle[3], busy[3], prev[3];
+	unsigned int slept, i;
+	int fd, ret, fw;
+
+	fd = open_group(I915_PMU_RC6_RESIDENCY, -1);
+	ret = perf_i915_open_group(I915_PMU_RC6p_RESIDENCY, fd);
+	if (ret > 0) {
+		num_pmu++;
+		ret = perf_i915_open_group(I915_PMU_RC6pp_RESIDENCY, fd);
+		if (ret > 0)
+			num_pmu++;
+	}
+
+	igt_require(num_pmu == 3);
+
+	gem_quiescent_gpu(gem_fd);
+	usleep(1000000);
+
+	/* Go idle and check full RC6. */
+	pmu_read_multi(fd, num_pmu, prev);
+	slept = measured_usleep(duration_ns / 1000);
+	pmu_read_multi(fd, num_pmu, idle);
+
+	for (i = 0; i < num_pmu; i++)
+		assert_within_epsilon(idle[i] - prev[i], slept, tolerance);
+
+	/* Wake up device and check no RC6. */
+	fw = igt_open_forcewake_handle(gem_fd);
+	igt_assert(fw >= 0);
+
+	pmu_read_multi(fd, num_pmu, prev);
+	usleep(duration_ns / 1000);
+	pmu_read_multi(fd, num_pmu, busy);
+
+	for (i = 0; i < num_pmu; i++)
+		assert_within_epsilon(busy[i] - prev[i], 0.0, tolerance);
+
+	close(fw);
+	close(fd);
+}
+
+igt_main
+{
+	const unsigned int num_other_metrics =
+				I915_PMU_LAST - __I915_PMU_OTHER(0) + 1;
+	unsigned int num_engines = 0;
+	int fd = -1;
+	const struct intel_execution_engine2 *e;
+	unsigned int i;
+
+	igt_fixture {
+		fd = drm_open_driver_master(DRIVER_INTEL);
+
+		igt_require_gem(fd);
+		igt_require(i915_type_id() > 0);
+
+		for_each_engine_class_instance(fd, e) {
+			if (gem_has_engine(fd, e->class, e->instance))
+				num_engines++;
+		}
+	}
+
+	/**
+	 * Test invalid access via perf API is rejected.
+	 */
+	igt_subtest("invalid-init")
+		invalid_init();
+
+	for_each_engine_class_instance(fd, e) {
+		/**
+		 * Test that a single engine metric can be initialized.
+		 */
+		igt_subtest_f("init-busy-%s", e->name)
+			init(fd, e, I915_SAMPLE_BUSY);
+
+		igt_subtest_f("init-wait-%s", e->name)
+			init(fd, e, I915_SAMPLE_WAIT);
+
+		igt_subtest_f("init-sema-%s", e->name)
+			init(fd, e, I915_SAMPLE_SEMA);
+
+		/**
+		 * Test that engines show no load when idle.
+		 */
+		igt_subtest_f("idle-%s", e->name)
+			single(fd, e, false);
+
+		/**
+		 * Test that a single engine reports load correctly.
+		 */
+		igt_subtest_f("busy-%s", e->name)
+			single(fd, e, true);
+
+		/**
+		 * Test that when one engine is loaded other report no load.
+		 */
+		igt_subtest_f("busy-check-all-%s", e->name)
+			busy_check_all(fd, e, num_engines);
+
+		/**
+		 * Test that when all except one engine are loaded all loads
+		 * are correctly reported.
+		 */
+		igt_subtest_f("most-busy-check-all-%s", e->name)
+			most_busy_check_all(fd, e, num_engines);
+
+		/**
+		 * Test that semphore counters report no activity on idle
+		 * or busy engines.
+		 */
+		igt_subtest_f("idle-no-semaphores-%s", e->name)
+			no_sema(fd, e, false);
+
+		igt_subtest_f("busy-no-semaphores-%s", e->name)
+			no_sema(fd, e, true);
+
+		/**
+		 * Check that two perf clients do not influence each others
+		 * observations.
+		 */
+		igt_subtest_f("multi-client-%s", e->name)
+			multi_client(fd, e);
+	}
+
+	/**
+	 * Test that when all engines are loaded all loads are
+	 * correctly reported.
+	 */
+	igt_subtest("all-busy-check-all")
+		all_busy_check_all(fd, num_engines);
+
+	/**
+	 * Test that non-engine counters can be initialized and read. Apart
+	 * from the invalid metric which should fail.
+	 */
+	for (i = 0; i < num_other_metrics + 1; i++) {
+		igt_subtest_f("other-init-%u", i)
+			init_other(i, i < num_other_metrics);
+
+		igt_subtest_f("other-read-%u", i)
+			read_other(i, i < num_other_metrics);
+	}
+
+	/**
+	 * Test counters are not affected by CPU offline/online events.
+	 */
+	igt_subtest("cpu-hotplug")
+		cpu_hotplug(fd);
+
+	/**
+	 * Test GPU frequency.
+	 */
+	igt_subtest("frequency")
+		test_frequency(fd);
+
+	/**
+	 * Test interrupt count reporting.
+	 */
+	igt_subtest("interrupts")
+		test_interrupts(fd);
+
+	/**
+	 * Test RC6 residency reporting.
+	 */
+	igt_subtest("rc6")
+		test_rc6(fd);
+
+	/**
+	 * Test RC6p residency reporting.
+	 */
+	igt_subtest("rc6p")
+		test_rc6p(fd);
+
+	/**
+	 * Check render nodes are counted.
+	 */
+	igt_subtest_group {
+		int render_fd;
+
+		igt_fixture {
+			render_fd = drm_open_driver_render(DRIVER_INTEL);
+			igt_require_gem(render_fd);
+
+			gem_quiescent_gpu(fd);
+		}
+
+		for_each_engine_class_instance(fd, e) {
+			igt_subtest_f("render-node-busy-%s", e->name)
+				single(fd, e, true);
+		}
+
+		igt_fixture {
+			close(render_fd);
+		}
+	}
+}
-- 
2.9.5

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