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.
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michal Winiarski <michal.winiarski@xxxxxxxxx>
Signed-off-by: Antonio Argenziano <antonio.argenziano@xxxxxxxxx>
---
tests/gem_exec_schedule.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/tests/gem_exec_schedule.c b/tests/gem_exec_schedule.c
index ae44a6c0..5a4d63f9 100644
--- a/tests/gem_exec_schedule.c
+++ b/tests/gem_exec_schedule.c
@@ -511,6 +511,39 @@ static void preempt_self(int fd, unsigned ring)
gem_close(fd, result);
}
+static void bad_preemptive(int fd, unsigned ring)
+{
+ igt_spin_t *spin[16];
+ igt_spin_t *bad;
+ uint32_t ctx[2];
+
+ ctx[LO] = gem_context_create(fd);
+ gem_context_set_priority(fd, ctx[LO], MIN_PRIO);
+
+ ctx[HI] = gem_context_create(fd);
+ gem_context_set_priority(fd, ctx[HI], MAX_PRIO);
+
+ for (int n = 0; n < 16; n++) {
+ gem_context_destroy(fd, ctx[LO]);
+ 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, true);
+ igt_debug("spin[%d].handle=%d\n", n, spin[n]->handle);
+ }
+
+ bad = igt_spin_batch_new(fd, ctx[HI], ring, 0, false);
+ gem_wait(fd, bad->handle, NULL);
+
+ for (int n = 0; n < 16; n++) {
+ igt_assert(gem_bo_busy(fd, spin[n]->handle));
+ igt_spin_batch_free(fd, spin[n]);
+ }
+
+ gem_context_destroy(fd, ctx[LO]);
+ gem_context_destroy(fd, ctx[HI]);
+}
+
static void deep(int fd, unsigned ring)
{
#define XS 8
@@ -1033,6 +1066,12 @@ igt_main
preempt(fd, e->exec_id | e->flags, NEW_CTX | HANG_LP);
igt_fork_hang_detector(fd);
}
+
+ igt_subtest_f("bad-preemptive-%s", e->name) {
+ igt_stop_hang_detector();
+ bad_preemptive(fd, e->exec_id | e->flags);
+ igt_fork_hang_detector(fd);
+ }
}
igt_subtest_f("deep-%s", e->name)
--
2.14.2
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