[igt-dev] [PATCH i-g-t 2/3] tests/i915/drm_fdinfo: Basic and functional tests for GPU busyness exported via fdinfo
Tvrtko Ursulin
tvrtko.ursulin at linux.intel.com
Fri Apr 1 14:11:54 UTC 2022
From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Mostly inherited from the perf_pmu, some basic tests, and some tests to
verify exported GPU busyness is as expected.
v2:
* Skip when kernel does not export drm keys in fdinfo.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
---
tests/i915/drm_fdinfo.c | 557 ++++++++++++++++++++++++++++++++++++++++
tests/meson.build | 8 +
2 files changed, 565 insertions(+)
create mode 100644 tests/i915/drm_fdinfo.c
diff --git a/tests/i915/drm_fdinfo.c b/tests/i915/drm_fdinfo.c
new file mode 100644
index 000000000000..3475d35b23b9
--- /dev/null
+++ b/tests/i915/drm_fdinfo.c
@@ -0,0 +1,557 @@
+/*
+ * Copyright © 2022 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 "igt.h"
+#include "igt_core.h"
+#include "igt_device.h"
+#include "igt_drm_fdinfo.h"
+#include "i915/gem.h"
+#include "intel_ctx.h"
+
+IGT_TEST_DESCRIPTION("Test the i915 drm fdinfo data");
+
+const double tolerance = 0.05f;
+const unsigned long batch_duration_ns = 500e6;
+
+#define __assert_within_epsilon(x, ref, tol_up, tol_down) \
+ igt_assert_f((double)(x) <= (1.0 + (tol_up)) * (double)(ref) && \
+ (double)(x) >= (1.0 - (tol_down)) * (double)(ref), \
+ "'%s' != '%s' (%f not within +%.1f%%/-%.1f%% tolerance of %f)\n",\
+ #x, #ref, (double)(x), \
+ (tol_up) * 100.0, (tol_down) * 100.0, \
+ (double)(ref))
+
+#define assert_within_epsilon(x, ref, tolerance) \
+ __assert_within_epsilon(x, ref, tolerance, tolerance)
+
+static void basics(int i915, unsigned int num_classes)
+{
+ struct drm_client_fdinfo info = { };
+ unsigned int ret;
+
+ ret = igt_parse_drm_fdinfo(i915, &info);
+ igt_assert(ret);
+
+ igt_assert(!strcmp(info.driver, "i915"));
+
+ igt_assert_eq(info.num_engines, num_classes);
+}
+
+/*
+ * 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)
+{
+ struct timespec ts = { };
+ unsigned int slept;
+
+ slept = igt_nsec_elapsed(&ts);
+ igt_assert(slept == 0);
+ do {
+ usleep(usec - slept);
+ slept = igt_nsec_elapsed(&ts) / 1000;
+ } while (slept < usec);
+
+ return igt_nsec_elapsed(&ts);
+}
+
+#define TEST_BUSY (1)
+#define FLAG_SYNC (2)
+#define TEST_TRAILING_IDLE (4)
+#define FLAG_HANG (8)
+#define TEST_ISOLATION (16)
+
+static igt_spin_t *__spin_poll(int fd, uint64_t ahnd, const intel_ctx_t *ctx,
+ const struct intel_execution_engine2 *e)
+{
+ struct igt_spin_factory opts = {
+ .ahnd = ahnd,
+ .ctx = ctx,
+ .engine = e->flags,
+ };
+
+ if (gem_class_can_store_dword(fd, e->class))
+ opts.flags |= IGT_SPIN_POLL_RUN;
+
+ return __igt_spin_factory(fd, &opts);
+}
+
+static unsigned long __spin_wait(int fd, igt_spin_t *spin)
+{
+ struct timespec start = { };
+
+ igt_nsec_elapsed(&start);
+
+ if (igt_spin_has_poll(spin)) {
+ unsigned long timeout = 0;
+
+ while (!igt_spin_has_started(spin)) {
+ unsigned long t = igt_nsec_elapsed(&start);
+
+ igt_assert(gem_bo_busy(fd, spin->handle));
+ if ((t - timeout) > 250e6) {
+ timeout = t;
+ igt_warn("Spinner not running after %.2fms\n",
+ (double)t / 1e6);
+ igt_assert(t < 2e9);
+ }
+ }
+ } else {
+ igt_debug("__spin_wait - usleep mode\n");
+ usleep(500e3); /* Better than nothing! */
+ }
+
+ igt_assert(gem_bo_busy(fd, spin->handle));
+ return igt_nsec_elapsed(&start);
+}
+
+static igt_spin_t *__spin_sync(int fd, uint64_t ahnd, const intel_ctx_t *ctx,
+ const struct intel_execution_engine2 *e)
+{
+ igt_spin_t *spin = __spin_poll(fd, ahnd, ctx, e);
+
+ __spin_wait(fd, spin);
+
+ return spin;
+}
+
+static igt_spin_t *spin_sync(int fd, uint64_t ahnd, const intel_ctx_t *ctx,
+ const struct intel_execution_engine2 *e)
+{
+ igt_require_gem(fd);
+
+ return __spin_sync(fd, ahnd, ctx, e);
+}
+
+static void end_spin(int fd, igt_spin_t *spin, unsigned int flags)
+{
+ if (!spin)
+ return;
+
+ igt_spin_end(spin);
+
+ if (flags & FLAG_SYNC)
+ gem_sync(fd, spin->handle);
+
+ if (flags & TEST_TRAILING_IDLE) {
+ unsigned long t, timeout = 0;
+ struct timespec start = { };
+
+ igt_nsec_elapsed(&start);
+
+ do {
+ t = igt_nsec_elapsed(&start);
+
+ if (gem_bo_busy(fd, spin->handle) &&
+ (t - timeout) > 10e6) {
+ timeout = t;
+ igt_warn("Spinner not idle after %.2fms\n",
+ (double)t / 1e6);
+ }
+
+ usleep(1e3);
+ } while (t < batch_duration_ns / 5);
+ }
+}
+
+static uint64_t read_busy(int i915, unsigned int class)
+{
+ struct drm_client_fdinfo info = { };
+
+ igt_assert(igt_parse_drm_fdinfo(i915, &info));
+
+ return info.busy[class];
+}
+
+static void
+single(int gem_fd, const intel_ctx_t *ctx,
+ const struct intel_execution_engine2 *e, unsigned int flags)
+{
+ unsigned long slept;
+ igt_spin_t *spin;
+ uint64_t val;
+ int spin_fd;
+ uint64_t ahnd;
+
+ if (flags & TEST_ISOLATION) {
+ spin_fd = gem_reopen_driver(gem_fd);
+ ctx = intel_ctx_create_all_physical(spin_fd);
+ } else {
+ spin_fd = gem_fd;
+ }
+
+ ahnd = get_reloc_ahnd(spin_fd, ctx->id);
+
+ if (flags & TEST_BUSY)
+ spin = spin_sync(spin_fd, ahnd, ctx, e);
+ else
+ spin = NULL;
+
+ val = read_busy(gem_fd, e->class);
+ slept = measured_usleep(batch_duration_ns / 1000);
+ if (flags & TEST_TRAILING_IDLE)
+ end_spin(spin_fd, spin, flags);
+ val = read_busy(gem_fd, e->class) - val;
+
+ if (flags & FLAG_HANG)
+ igt_force_gpu_reset(spin_fd);
+ else
+ end_spin(spin_fd, spin, FLAG_SYNC);
+
+ assert_within_epsilon(val,
+ (flags & TEST_BUSY) && !(flags & TEST_ISOLATION) ?
+ slept : 0.0f,
+ tolerance);
+
+ /* Check for idle after hang. */
+ if (flags & FLAG_HANG) {
+ gem_quiescent_gpu(spin_fd);
+ igt_assert(!gem_bo_busy(spin_fd, spin->handle));
+
+ val = read_busy(gem_fd, e->class);
+ slept = measured_usleep(batch_duration_ns / 1000);
+ val = read_busy(gem_fd, e->class) - val;
+
+ assert_within_epsilon(val, 0, tolerance);
+ }
+
+ igt_spin_free(spin_fd, spin);
+ put_ahnd(ahnd);
+
+ gem_quiescent_gpu(spin_fd);
+}
+
+static void log_busy(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 read_busy_all(int i915, uint64_t *val)
+{
+ struct drm_client_fdinfo info = { };
+
+ igt_assert(igt_parse_drm_fdinfo(i915, &info));
+
+ memcpy(val, info.busy, sizeof(info.busy));
+}
+
+static void
+busy_check_all(int gem_fd, const intel_ctx_t *ctx,
+ const struct intel_execution_engine2 *e,
+ const unsigned int num_engines,
+ const unsigned int classes[16], const unsigned int num_classes,
+ unsigned int flags)
+{
+ uint64_t ahnd = get_reloc_ahnd(gem_fd, ctx->id);
+ uint64_t tval[2][16];
+ unsigned long slept;
+ uint64_t val[16];
+ igt_spin_t *spin;
+ unsigned int i;
+
+ memset(tval, 0, sizeof(tval));
+
+ spin = spin_sync(gem_fd, ahnd, ctx, e);
+
+ read_busy_all(gem_fd, tval[0]);
+ slept = measured_usleep(batch_duration_ns / 1000);
+ if (flags & TEST_TRAILING_IDLE)
+ end_spin(gem_fd, spin, flags);
+ read_busy_all(gem_fd, tval[1]);
+
+ end_spin(gem_fd, spin, FLAG_SYNC);
+ igt_spin_free(gem_fd, spin);
+ put_ahnd(ahnd);
+
+ for (i = 0; i < num_classes; i++)
+ val[i] = tval[1][i] - tval[0][i];
+
+ log_busy(num_classes, val);
+
+ for (i = 0; i < num_classes; i++) {
+ double target = i == e->class ? slept : 0.0f;
+
+ assert_within_epsilon(val[i], target, tolerance);
+ }
+
+ gem_quiescent_gpu(gem_fd);
+}
+
+static void
+__submit_spin(int gem_fd, igt_spin_t *spin,
+ const struct intel_execution_engine2 *e,
+ int offset)
+{
+ struct drm_i915_gem_execbuffer2 eb = spin->execbuf;
+
+ eb.flags &= ~(0x3f | I915_EXEC_BSD_MASK);
+ eb.flags |= e->flags | I915_EXEC_NO_RELOC;
+ eb.batch_start_offset += offset;
+
+ gem_execbuf(gem_fd, &eb);
+}
+
+static void
+most_busy_check_all(int gem_fd, const intel_ctx_t *ctx,
+ const struct intel_execution_engine2 *e,
+ const unsigned int num_engines,
+ const unsigned int classes[16],
+ const unsigned int num_classes,
+ unsigned int flags)
+{
+ uint64_t ahnd = get_reloc_ahnd(gem_fd, ctx->id);
+ unsigned int busy_class[num_classes];
+ struct intel_execution_engine2 *e_;
+ igt_spin_t *spin = NULL;
+ uint64_t tval[2][16];
+ unsigned long slept;
+ uint64_t val[16];
+ unsigned int i;
+
+ memset(busy_class, 0, sizeof(busy_class));
+ memset(tval, 0, sizeof(tval));
+
+ for_each_ctx_engine(gem_fd, ctx, e_) {
+ if (e->class == e_->class && e->instance == e_->instance) {
+ continue;
+ } else if (spin) {
+ __submit_spin(gem_fd, spin, e_, 64);
+ busy_class[e_->class]++;
+ } else {
+ spin = __spin_poll(gem_fd, ahnd, ctx, e_);
+ busy_class[e_->class]++;
+ }
+ }
+ igt_require(spin); /* at least one busy engine */
+
+ /* Small delay to allow engines to start. */
+ usleep(__spin_wait(gem_fd, spin) * num_engines / 1e3);
+
+ read_busy_all(gem_fd, tval[0]);
+ slept = measured_usleep(batch_duration_ns / 1000);
+ if (flags & TEST_TRAILING_IDLE)
+ end_spin(gem_fd, spin, flags);
+ read_busy_all(gem_fd, tval[1]);
+
+ end_spin(gem_fd, spin, FLAG_SYNC);
+ igt_spin_free(gem_fd, spin);
+ put_ahnd(ahnd);
+
+ for (i = 0; i < num_classes; i++)
+ val[i] = tval[1][i] - tval[0][i];
+
+ log_busy(num_classes, val);
+
+ for (i = 0; i < num_classes; i++) {
+ double target = slept * busy_class[i];
+
+ assert_within_epsilon(val[i], target, tolerance);
+ }
+ gem_quiescent_gpu(gem_fd);
+}
+
+static void
+all_busy_check_all(int gem_fd, const intel_ctx_t *ctx,
+ const unsigned int num_engines,
+ const unsigned int classes[16],
+ const unsigned int num_classes,
+ unsigned int flags)
+{
+ uint64_t ahnd = get_reloc_ahnd(gem_fd, ctx->id);
+ unsigned int busy_class[num_classes];
+ struct intel_execution_engine2 *e;
+ igt_spin_t *spin = NULL;
+ uint64_t tval[2][16];
+ unsigned long slept;
+ uint64_t val[16];
+ unsigned int i;
+
+ memset(busy_class, 0, sizeof(busy_class));
+ memset(tval, 0, sizeof(tval));
+
+ for_each_ctx_engine(gem_fd, ctx, e) {
+ if (spin)
+ __submit_spin(gem_fd, spin, e, 64);
+ else
+ spin = __spin_poll(gem_fd, ahnd, ctx, e);
+ busy_class[e->class]++;
+ }
+
+ /* Small delay to allow engines to start. */
+ usleep(__spin_wait(gem_fd, spin) * num_engines / 1e3);
+
+ read_busy_all(gem_fd, tval[0]);
+ slept = measured_usleep(batch_duration_ns / 1000);
+ if (flags & TEST_TRAILING_IDLE)
+ end_spin(gem_fd, spin, flags);
+ read_busy_all(gem_fd, tval[1]);
+
+ end_spin(gem_fd, spin, FLAG_SYNC);
+ igt_spin_free(gem_fd, spin);
+ put_ahnd(ahnd);
+
+ for (i = 0; i < num_classes; i++)
+ val[i] = tval[1][i] - tval[0][i];
+
+ log_busy(num_classes, val);
+
+ for (i = 0; i < num_classes; i++) {
+ double target = slept * busy_class[i];
+
+ assert_within_epsilon(val[i], target, tolerance);
+ }
+ gem_quiescent_gpu(gem_fd);
+}
+
+#define test_each_engine(T, i915, ctx, e) \
+ igt_subtest_with_dynamic(T) for_each_ctx_engine(i915, ctx, e) \
+ igt_dynamic_f("%s", e->name)
+
+igt_main
+{
+ unsigned int num_engines = 0, num_classes = 0;
+ const struct intel_execution_engine2 *e;
+ unsigned int classes[16] = { };
+ const intel_ctx_t *ctx = NULL;
+ int i915 = -1;
+
+ igt_fixture {
+ struct drm_client_fdinfo info = { };
+ unsigned int i;
+
+ i915 = __drm_open_driver(DRIVER_INTEL);
+
+ igt_require_gem(i915);
+ igt_require(igt_parse_drm_fdinfo(i915, &info));
+
+ ctx = intel_ctx_create_all_physical(i915);
+
+ for_each_ctx_engine(i915, ctx, e) {
+ num_engines++;
+ igt_assert(e->class < ARRAY_SIZE(classes));
+ classes[e->class]++;
+ }
+ igt_require(num_engines);
+
+ for (i = 0; i < ARRAY_SIZE(classes); i++) {
+ if (classes[i])
+ num_classes++;
+ }
+ igt_assert(num_classes);
+ }
+
+ /**
+ * Test basic fdinfo content.
+ */
+ igt_subtest("basics")
+ basics(i915, num_classes);
+
+ /**
+ * Test that engines show no load when idle.
+ */
+ test_each_engine("idle", i915, ctx, e)
+ single(i915, ctx, e, 0);
+
+ /**
+ * Test that a single engine reports load correctly.
+ */
+ test_each_engine("busy", i915, ctx, e)
+ single(i915, ctx, e, TEST_BUSY);
+
+ test_each_engine("busy-idle", i915, ctx, e)
+ single(i915, ctx, e, TEST_BUSY | TEST_TRAILING_IDLE);
+
+ test_each_engine("busy-hang", i915, ctx, e) {
+ igt_hang_t hang = igt_allow_hang(i915, ctx->id, 0);
+
+ single(i915, ctx, e, TEST_BUSY | FLAG_HANG);
+
+ igt_disallow_hang(i915, hang);
+ }
+
+ /**
+ * Test that when one engine is loaded other report no
+ * load.
+ */
+ test_each_engine("busy-check-all", i915, ctx, e)
+ busy_check_all(i915, ctx, e, num_engines, classes, num_classes,
+ TEST_BUSY);
+
+ test_each_engine("busy-idle-check-all", i915, ctx, e)
+ busy_check_all(i915, ctx, e, num_engines, classes, num_classes,
+ TEST_BUSY | TEST_TRAILING_IDLE);
+
+ /**
+ * Test that when all except one engine are loaded all
+ * loads are correctly reported.
+ */
+ test_each_engine("most-busy-check-all", i915, ctx, e)
+ most_busy_check_all(i915, ctx, e, num_engines,
+ classes, num_classes,
+ TEST_BUSY);
+
+ test_each_engine("most-busy-idle-check-all", i915, ctx, e)
+ most_busy_check_all(i915, ctx, e, num_engines,
+ classes, num_classes,
+ TEST_BUSY | TEST_TRAILING_IDLE);
+
+ /**
+ * Test that when all engines are loaded all loads are
+ * correctly reported.
+ */
+ igt_subtest("all-busy-check-all")
+ all_busy_check_all(i915, ctx, num_engines, classes, num_classes,
+ TEST_BUSY);
+
+ igt_subtest("all-busy-idle-check-all")
+ all_busy_check_all(i915, ctx, num_engines, classes, num_classes,
+ TEST_BUSY | TEST_TRAILING_IDLE);
+
+ /**
+ * Test for no cross-client contamination.
+ */
+ test_each_engine("isolation", i915, ctx, e)
+ single(i915, ctx, e, TEST_BUSY | TEST_ISOLATION);
+
+ igt_fixture {
+ intel_ctx_destroy(i915, ctx);
+ close(i915);
+ }
+}
diff --git a/tests/meson.build b/tests/meson.build
index a152d2a05291..b0eab3d6c8e3 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -293,6 +293,14 @@ foreach prog : i915_progs
test_list += prog
endforeach
+test_executables += executable('drm_fdinfo',
+ join_paths('i915', 'drm_fdinfo.c'),
+ dependencies : test_deps + [ lib_igt_drm_fdinfo ],
+ install_dir : libexecdir,
+ install_rpath : libexecdir_rpathdir,
+ install : true)
+test_list += 'drm_fdinfo'
+
test_executables += executable('dumb_buffer', 'dumb_buffer.c',
dependencies : test_deps + [ libatomic ],
install_dir : libexecdir,
--
2.32.0
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