[PATCH i-g-t 6/9] i915/gem_exec_schedule: Check timeslice

Chris Wilson
2019-08-13T06:20:13Z

Check that we can run a second request even if an equal priority spinner
is hogging the engine.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
tests/i915/gem_exec_schedule.c | 36 ++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)

diff --git a/tests/i915/gem_exec_schedule.c b/tests/i915/gem_exec_schedule.c
index 058102103..04cede9c9 100644
--- a/tests/i915/gem_exec_schedule.c
+++ b/tests/i915/gem_exec_schedule.c
@@ -1033,6 +1033,39 @@ static void preempt_queue(int fd, unsigned ring, unsigned int flags)
}
}

+static void preempt_timeslice(int fd, unsigned ring)
+{
+ const uint32_t bbe = MI_BATCH_BUFFER_END;
+ struct drm_i915_gem_exec_object2 obj = {
+ .handle = gem_create(fd, 4096)
+ };
+ struct drm_i915_gem_execbuffer2 execbuf = {
+ .buffers_ptr = to_user_pointer(&obj),
+ .buffer_count = 1,
+ .flags = ring,
+ .rsvd1 = gem_context_create(fd),
+ };
+ 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(fd, .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(fd, obj.handle, 0, &bbe, sizeof(bbe));
+ gem_execbuf(fd, &execbuf);
+ gem_sync(fd, obj.handle);
+
+ igt_assert(gem_bo_busy(fd, spin->handle));
+ igt_spin_free(fd, spin);
+
+ gem_context_destroy(fd, execbuf.rsvd1);
+ gem_close(fd, obj.handle);
+}
+
static void preempt_self(int fd, unsigned ring)
{
uint32_t result = gem_create(fd, 4096);
@@ -1740,6 +1773,9 @@ 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;