Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
tests/gem_exec_latency.c | 50 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/tests/gem_exec_latency.c b/tests/gem_exec_latency.c
index c4579e55b..3327fe079 100644
--- a/tests/gem_exec_latency.c
+++ b/tests/gem_exec_latency.c
@@ -60,6 +60,51 @@
static unsigned int ring_size;
+static void
+poll_ring(int fd, unsigned ring, const char *name)
+{
+ struct timespec tv = {};
+ unsigned long cycles;
+ igt_spin_t *spin[2];
+ uint64_t elapsed;
+ uint32_t cmd;
+
+ gem_require_ring(fd, ring);
+ igt_require(gem_can_store_dword(fd, ring));
+
+ spin[0] = __igt_spin_batch_new_poll(fd, 0, ring);
+ igt_assert(spin[0]->running);
+ cmd = *spin[0]->batch;
+
+ spin[1] = __igt_spin_batch_new_poll(fd, 0, ring);
+ igt_assert(spin[1]->running);
+ igt_assert(cmd == *spin[1]->batch);
+
+ igt_spin_batch_end(spin[0]);
+ while (!READ_ONCE(*spin[1]->running))
+ ;
+ igt_assert(!gem_bo_busy(fd, spin[0]->handle));
+
+ cycles = 0;
+ while ((elapsed = igt_nsec_elapsed(&tv)) < 2ull << 30) {
+ unsigned int idx = cycles++ & 1;
+
+ *spin[idx]->batch = cmd;
+ *spin[idx]->running = 0;
+ gem_execbuf(fd, &spin[idx]->execbuf);
+
+ igt_spin_batch_end(spin[!idx]);
+ while (!READ_ONCE(*spin[idx]->running))
+ ;
+ }
+
+ igt_info("%s completed %ld cycles: %.3f us\n",
+ name, cycles, elapsed*1e-3/cycles);
+
+ igt_spin_batch_free(fd, spin[1]);
+ igt_spin_batch_free(fd, spin[0]);
+}
+
#define RCS_TIMESTAMP (0x2000 + 0x358)
static void latency_on_ring(int fd,
unsigned ring, const char *name,
@@ -591,6 +636,11 @@ igt_main
e->exec_id | e->flags,
e->name, 0);
+ igt_subtest_f("%s-poll", e->name)
+ poll_ring(device,
+ e->exec_id | e->flags,
+ e->name);
+
igt_subtest_f("%s-rtidle-submit", e->name)
rthog_latency_on_ring(device,
e->exec_id |
--
2.17.1
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