This patch adds a test that will trigger a preemption of a low priority
batch by a 'bad' batch buffer which will hang. The test aims at making
sure that a hanging high priority batch will not disrupt the submission
flow of low priority contexts.
-v2:
- Rename subtest (Chris)
- Use igt_hang_ctx to hang ring (Chris)
- Add comment on execution order checks (Chris)
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michal Winiarski <michal.winiarski@xxxxxxxxx>
Signed-off-by: Antonio Argenziano <antonio.argenziano@xxxxxxxxx>
---
tests/gem_exec_schedule.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/tests/gem_exec_schedule.c b/tests/gem_exec_schedule.c
index d0f85b3e..0c2efaa2 100644
--- a/tests/gem_exec_schedule.c
+++ b/tests/gem_exec_schedule.c
@@ -515,6 +515,40 @@ static void preempt_self(int fd, unsigned ring)
gem_close(fd, result);
}
+static void preemptive_hang(int fd, unsigned ring)
+{
+ igt_spin_t *spin[16];
+ igt_hang_t hang;
+ uint32_t ctx[2];
+
+ ctx[HI] = gem_context_create(fd);
+ gem_context_set_priority(fd, ctx[HI], MAX_PRIO);
+
+ for (int n = 0; n < 16; n++) {
+ ctx[LO] = gem_context_create(fd);
+ gem_context_set_priority(fd, ctx[LO], MIN_PRIO);
+
+ spin[n] = __igt_spin_batch_new(fd, ctx[LO], ring, 0);
+ igt_debug("spin[%d].handle=%d\n", n, spin[n]->handle);
+
+ gem_context_destroy(fd, ctx[LO]);
+ }
+
+ hang = igt_hang_ctx(fd, ctx[HI], ring, 0, NULL);
+ gem_wait(fd, hang.handle, NULL);
+
+ for (int n = 0; n < 16; n++) {
+ /* Current behavior is to execute requests in order of submission.
+ * This is subject to change as the scheduler evolve. The test should
+ * be updated to reflect such changes.
+ */
+ igt_assert(gem_bo_busy(fd, spin[n]->handle));
+ igt_spin_batch_free(fd, spin[n]);
+ }
+
+ gem_context_destroy(fd, ctx[HI]);
+}
+
static void deep(int fd, unsigned ring)
{
#define XS 8
@@ -1044,6 +1078,9 @@ igt_main
preempt(fd, e->exec_id | e->flags, NEW_CTX | HANG_LP);
}
+ igt_subtest_f("preemptive-hang-%s", e->name)
+ preemptive_hang(fd, e->exec_id | e->flags);
+
igt_fixture {
igt_disallow_hang(fd, hang);
igt_fork_hang_detector(fd);
--
2.14.2
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