Check that we can run a second request even if an equal priority spinner
is hogging the engine.
Extend the testing with some undying timeslice behaviour that requires
hangcheck to intervene.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
tests/i915/gem_exec_schedule.c | 109 +++++++++++++++++++++++++++++++++
1 file changed, 109 insertions(+)
diff --git a/tests/i915/gem_exec_schedule.c b/tests/i915/gem_exec_schedule.c
index ddcb1f21a..461e8de09 100644
--- a/tests/i915/gem_exec_schedule.c
+++ b/tests/i915/gem_exec_schedule.c
@@ -1060,6 +1060,107 @@ static void preempt_queue(int fd, unsigned ring, unsigned int flags)
}
}
+static void preempt_timeslice(int i915, unsigned ring)
+{
+ const uint32_t bbe = MI_BATCH_BUFFER_END;
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = gem_create(i915, 4096)
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ .flags = ring,
+ .rsvd1 = gem_context_create(i915),
+ };
+ igt_spin_t *spin;
+
+ /*
+ * Launch a spinner to occupy the target engine, and then
+ * check we execute a ping underneath it from a second context.
+ */
+ spin = igt_spin_new(i915, .engine = ring, .flags = IGT_SPIN_POLL_RUN);
+ igt_spin_busywait_until_started(spin);
+
+ /* Both the active spinner and this are at the same priority */
+ gem_write(i915, obj.handle, 0, &bbe, sizeof(bbe));
+ gem_execbuf(i915, &execbuf);
+ gem_sync(i915, obj.handle);
+
+ igt_assert(gem_bo_busy(i915, spin->handle));
+ igt_spin_free(i915, spin);
+
+ gem_context_destroy(i915, execbuf.rsvd1);
+ gem_close(i915, obj.handle);
+}
+
+static void preempt_timeslice_undying(int i915, unsigned ring)
+{
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = gem_create(i915, 4096)
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ .flags = ring,
+ .rsvd1 = gem_context_create(i915),
+ };
+ igt_spin_t *spin;
+
+ /*
+ * We should not allow a spinner to evade hangcheck by simply
+ * being timesliced.
+ */
+ spin = igt_spin_new(i915, .engine = ring, .flags = IGT_SPIN_POLL_RUN);
+ igt_spin_busywait_until_started(spin);
+
+ for (int i = 0; i < 120; i++) {
+ const uint32_t bbe = MI_BATCH_BUFFER_END;
+
+ if (!gem_bo_busy(i915, spin->handle))
+ break;
+
+ gem_write(i915, obj.handle, 0, &bbe, sizeof(bbe));
+ gem_execbuf(i915, &execbuf);
+
+ usleep(500 * 1000); /* 0.5s */
+ }
+
+ igt_assert(!gem_bo_busy(i915, spin->handle));
+ igt_spin_free(i915, spin);
+
+ gem_context_destroy(i915, execbuf.rsvd1);
+ gem_close(i915, obj.handle);
+}
+
+static void preempt_antitimeslice(int i915, unsigned ring)
+{
+ uint32_t ctx[2] = { gem_context_create(i915), gem_context_create(i915) };
+ igt_spin_t *spin[2];
+
+ /*
+ * Launch two independent spinners to occupy an engine. Timeslicing
+ * should not allow them to bypass hangcheck and run indefinitely.
+ */
+ for (int i = 0; i < ARRAY_SIZE(spin); i++)
+ spin[i] = igt_spin_new(i915, ctx[i],
+ .engine = ring,
+ .flags = IGT_SPIN_FENCE_OUT);
+
+ /* Hangcheck should kill each spinner after about 10s */
+ for (int i = 0; i < ARRAY_SIZE(spin); i++) {
+ int64_t timeout = 60ull * NSEC_PER_SEC;
+ igt_assert_eq(gem_wait(i915, spin[i]->handle, &timeout), 0);
+ }
+
+ for (int i = 0; i < ARRAY_SIZE(spin); i++) {
+ igt_assert(!gem_bo_busy(i915, spin[i]->handle));
+ igt_assert_eq(sync_fence_status(spin[i]->out_fence), -EIO);
+
+ igt_spin_free(i915, spin[i]);
+ gem_context_destroy(i915, ctx[i]);
+ }
+}
+
static void preempt_self(int fd, unsigned ring)
{
uint32_t result = gem_create(fd, 4096);
@@ -1773,6 +1874,8 @@ igt_main
igt_subtest_f("preempt-queue-contexts-chain-%s", e->name)
preempt_queue(fd, e->exec_id | e->flags, CONTEXTS | CHAIN);
+ igt_subtest_f("preempt-timeslice-%s", e->name)
+ preempt_timeslice(fd, e->exec_id | e->flags);
igt_subtest_group {
igt_hang_t hang;
@@ -1788,6 +1891,12 @@ igt_main
igt_subtest_f("preemptive-hang-%s", e->name)
preemptive_hang(fd, e->exec_id | e->flags);
+ igt_subtest_f("preempt-timeslice-undying-%s", e->name)
+ preempt_timeslice_undying(fd, e->exec_id | e->flags);
+
+ igt_subtest_f("preempt-antitimeslice-%s", e->name)
+ preempt_antitimeslice(fd, e->exec_id | e->flags);
+
igt_fixture {
igt_disallow_hang(fd, hang);
igt_fork_hang_detector(fd);
--
2.23.0
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