[PATCH i-g-t] tests/intel/xe_sysfs_preempt_timeout: Porting sysfs preempt test in xe
nakshtra.goyal at intel.com
nakshtra.goyal at intel.com
Wed Jul 24 18:03:50 UTC 2024
From: Nakshtra Goyal <nakshtra.goyal at intel.com>
Porting the sysfs_preempt_timeout test from i915 to xe by using two
spinner approach to check that if preemption is happening for different
given times
Signed-off-by: Nakshtra Goyal <nakshtra.goyal at intel.com>
---
tests/intel/xe_sysfs_preempt_timeout.c | 243 +++++++++++++++++++++++++
tests/meson.build | 1 +
2 files changed, 244 insertions(+)
create mode 100644 tests/intel/xe_sysfs_preempt_timeout.c
diff --git a/tests/intel/xe_sysfs_preempt_timeout.c b/tests/intel/xe_sysfs_preempt_timeout.c
new file mode 100644
index 000000000..354d688e7
--- /dev/null
+++ b/tests/intel/xe_sysfs_preempt_timeout.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+/**
+ * TEST: sysfs preempt timeout
+ * Category: Core
+ * Mega feature: SysMan
+ * Sub-category: SysMan tests
+ * Functionality: sysfs preempt timeout
+ * Feature: SMI, context
+ * Test category: SysMan
+ *
+ * SUBTEST: %s-timeout
+ * Description: Test to measure the delay from requestion the preemption to its
+ * completion. Send down some non-preemptable workloads and then
+ * request a switch to a higher priority context. The HW will not
+ * be able to respond, so the kernel will be forced to reset the hog.
+ * Test category: functionality test
+ *
+ * arg[1]:
+ *
+ * @preempt_timeout_us: preempt timeout us
+ */
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sched.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include "xe/xe_spin.h"
+#include "igt_syncobj.h"
+#include "lib/intel_reg.h"
+#include "xe_drm.h"
+#include "xe/xe_ioctl.h"
+#include "xe/xe_query.h"
+
+#include "igt.h"
+#include "igt_params.h"
+#include "drmtest.h"
+#include "igt_debugfs.h"
+#include "igt_dummyload.h"
+#include "igt_sysfs.h"
+#include "intel_allocator.h"
+#include "sw_sync.h"
+
+#define ATTR "preempt_timeout_us"
+
+static void set_preempt_timeout(int engine, unsigned int value)
+{
+ unsigned int delay;
+
+ igt_assert_lte(0, igt_sysfs_printf(engine, ATTR, "%u", value));
+ igt_sysfs_scanf(engine, ATTR, "%u", &delay);
+ igt_assert_eq(delay, value);
+}
+
+static uint64_t __test_timeout(int xe, int engine, unsigned int timeout)
+{
+ struct drm_xe_sync sync = {
+ .handle = syncobj_create(xe, 0),
+ .type = DRM_XE_SYNC_TYPE_SYNCOBJ,
+ .flags = DRM_XE_SYNC_FLAG_SIGNAL,
+ };
+
+ struct drm_xe_exec exec = {
+ .num_batch_buffer = 1,
+ .num_syncs = 1,
+ .syncs = to_user_pointer(&sync),
+ };
+/* high priority property */
+ struct drm_xe_ext_set_property ext = {
+ .base.next_extension = 0,
+ .base.name = DRM_XE_EXEC_QUEUE_EXTENSION_SET_PROPERTY,
+ .property = DRM_XE_EXEC_QUEUE_SET_PROPERTY_PRIORITY,
+ .value = 2, /* High priority */
+ };
+ struct drm_xe_engine_class_instance *hwe;
+ uint64_t ahnd = 0;
+ uint32_t exec_queues[2];
+ uint32_t vm[2];
+ uint32_t bo[2];
+ size_t bo_size;
+ struct xe_spin *spin[2];
+ struct timespec ts = {};
+ double elapsed;
+ uint64_t addr1 = 0x1a0000;
+ uint64_t addr2 = 0x100000;
+ int i, n_engines;
+
+ /* set preempt timeout*/
+ set_preempt_timeout(engine, timeout);
+
+ n_engines = 0;
+ /* select an random engine */
+ i = rand() % xe_number_engines(xe);
+ xe_for_each_engine(xe, hwe) {
+ if (i == n_engines++)
+ break;
+ }
+
+ vm[0] = xe_vm_create(xe, 0, 0);
+ vm[1] = xe_vm_create(xe, 0, 0);
+ exec_queues[0] = xe_exec_queue_create(xe, vm[0], hwe, 0);
+ exec_queues[1] = xe_exec_queue_create(xe, vm[1], hwe, to_user_pointer(&ext));
+ ahnd = intel_allocator_open(xe, 0, INTEL_ALLOCATOR_RELOC);
+ bo_size = xe_bb_size(xe, sizeof(*spin));
+ bo[0] = xe_bo_create(xe, vm[0], bo_size, vram_if_possible(xe, 0), 0);
+ spin[0] = xe_bo_map(xe, bo[0], bo_size);
+ xe_vm_bind_sync(xe, vm[0], bo[0], 0, addr1, bo_size);
+ xe_spin_init_opts(spin[0], .addr = addr1,
+ .preempt = false);
+ exec.address = addr1;
+ exec.exec_queue_id = exec_queues[0];
+ xe_exec(xe, &exec);
+ xe_spin_wait_started(spin[0]);
+
+ igt_nsec_elapsed(&ts);
+ bo[1] = xe_bo_create(xe, vm[1], bo_size, vram_if_possible(xe, 0), 0);
+ spin[1] = xe_bo_map(xe, bo[1], bo_size);
+ xe_vm_bind_sync(xe, vm[1], bo[1], 0, addr2, bo_size);
+ xe_spin_init_opts(spin[1], .addr = addr2);
+ exec.address = addr2;
+ exec.exec_queue_id = exec_queues[1];
+ xe_exec(xe, &exec);
+ xe_spin_wait_started(spin[1]);
+ elapsed = igt_nsec_elapsed(&ts);
+ xe_spin_end(spin[1]);
+
+ igt_assert(syncobj_wait(xe, &sync.handle, 1, INT64_MAX, 0, NULL));
+
+ xe_spin_end(spin[0]);
+ syncobj_destroy(xe, sync.handle);
+
+ xe_vm_unbind_sync(xe, vm[0], 0, addr1, bo_size);
+ xe_vm_unbind_sync(xe, vm[1], 0, addr2, bo_size);
+ xe_exec_queue_destroy(xe, exec_queues[0]);
+ xe_vm_destroy(xe, vm[0]);
+ xe_exec_queue_destroy(xe, exec_queues[1]);
+ xe_vm_destroy(xe, vm[1]);
+
+ put_ahnd(ahnd);
+
+ return elapsed;
+}
+
+static void test_timeout(int xe, int engine, const char **property)
+{
+ int delays[] = { 1000, 50000, 100000, 500000 };
+ unsigned int saved;
+ uint64_t elapsed;
+ int epsilon;
+
+ /*
+ * Send down some non-preemptable workloads and then request a
+ * switch to a higher priority context. The HW will not be able to
+ * respond, so the kernel will be forced to reset the hog. This
+ * timeout should match our specification, and so we can measure
+ * the delay from requesting the preemption to its completion.
+ */
+
+ igt_assert(igt_sysfs_scanf(engine, ATTR, "%u", &saved) == 1);
+ igt_debug("Initial %s:%u\n", ATTR, saved);
+
+ elapsed = __test_timeout(xe, engine, 1);
+ epsilon = 2 * elapsed / 1000;
+ if (epsilon < 50000)
+ epsilon = 50000;
+ igt_info("Minimum timeout measured as %.2fus; setting error threshold to %dus\n",
+ elapsed * 1e-3, epsilon);
+ igt_require(epsilon < 1000000);
+
+ for (int i = 0; i < ARRAY_SIZE(delays); i++) {
+ elapsed = __test_timeout(xe, engine, delays[i]);
+ igt_info("%s:%d, elapsed=%.2fus\n",
+ ATTR, delays[i], elapsed * 1e-3);
+
+ /*
+ * We need to give a couple of jiffies slack for the scheduler
+ * timeouts and then a little more slack fr the overhead in
+ * submitting and measuring. 50ms should cover all of our sins
+ * and be useful tolerance.
+ */
+ igt_assert_f(elapsed / 1000 / 1000 < delays[i] + epsilon,
+ "Forced preemption timeout exceeded request!\n");
+ }
+
+ set_preempt_timeout(engine, saved);
+}
+
+igt_main
+{
+ static const struct {
+ const char *name;
+ void (*fn)(int, int, const char **);
+ } tests[] = {
+ { "timeout", test_timeout },
+ { }
+ };
+
+ const char *property[][3] = { {"preempt_timeout_us", "preempt_timeout_min", "preempt_timeout_max"},
+ };
+ int count = sizeof(property) / sizeof(property[0]);
+ int xe = -1;
+ int sys_fd;
+ int gt;
+
+ igt_fixture {
+ xe = drm_open_driver(DRIVER_XE);
+ xe_device_get(xe);
+
+ sys_fd = igt_sysfs_open(xe);
+ igt_require(sys_fd != -1);
+ close(sys_fd);
+ }
+
+ for (int i = 0; i < count; i++) {
+ for (typeof(*tests) *t = tests; t->name; t++) {
+ igt_subtest_with_dynamic_f("%s-%s", property[i][0], t->name) {
+ xe_for_each_gt(xe, gt) {
+ int engines_fd = -1;
+ int gt_fd = -1;
+
+ gt_fd = xe_sysfs_gt_open(xe, gt);
+ igt_require(gt_fd != -1);
+ engines_fd = openat(gt_fd, "engines", O_RDONLY);
+ igt_require(engines_fd != -1);
+
+ igt_sysfs_engines(xe, engines_fd, property[i], t->fn);
+ close(engines_fd);
+ close(gt_fd);
+ }
+ }
+ }
+ }
+ igt_fixture {
+ xe_device_put(xe);
+ close(xe);
+ }
+}
diff --git a/tests/meson.build b/tests/meson.build
index e649466be..335c8b837 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -315,6 +315,7 @@ intel_xe_progs = [
'xe_spin_batch',
'xe_sysfs_defaults',
'xe_sysfs_scheduler',
+ 'xe_sysfs_preempt_timeout',
]
chamelium_progs = [
--
2.34.1
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