[PATCH igt 03/10] igt/gem_ctx_switch: Exercise all engines at once

Chris Wilson
2017-07-28T12:14:39Z

Just a small variant to apply a continuous context-switch load to all
engines.
---
tests/gem_ctx_switch.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 80 insertions(+)

diff --git a/tests/gem_ctx_switch.c b/tests/gem_ctx_switch.c
index b6ea71cf..df22efec 100644
--- a/tests/gem_ctx_switch.c
+++ b/tests/gem_ctx_switch.c
@@ -140,6 +140,81 @@ static void single(int fd, uint32_t handle,
gem_context_destroy(fd, contexts[n]);
}

+static void all(int fd, uint32_t handle, unsigned flags, int timeout)
+{
+ struct drm_i915_gem_execbuffer2 execbuf;
+ struct drm_i915_gem_exec_object2 obj[2];
+ unsigned int engine[16], e;
+ const char *name[16];
+ uint32_t contexts[64];
+ unsigned int nengine;
+ int n;
+
+ nengine = 0;
+ for_each_engine(fd, e) {
+ if (e == 0 || e == I915_EXEC_BSD)
+ continue;
+
+ engine[nengine] = e;
+ name[nengine] = e__->name;
+ nengine++;
+ }
+ igt_require(nengine);
+
+ igt_require(__gem_context_create(fd, &contexts[0]) == 0);
+ for (n = 1; n < 64; n++)
+ contexts[n] = gem_context_create(fd);
+
+ memset(obj, 0, sizeof(obj));
+ obj[1].handle = handle;
+
+ memset(&execbuf, 0, sizeof(execbuf));
+ execbuf.buffers_ptr = to_user_pointer(obj + 1);
+ execbuf.buffer_count = 1;
+ execbuf.rsvd1 = contexts[0];
+ execbuf.flags |= LOCAL_I915_EXEC_HANDLE_LUT;
+ execbuf.flags |= LOCAL_I915_EXEC_NO_RELOC;
+ igt_require(__gem_execbuf(fd, &execbuf) == 0);
+ if (__gem_execbuf(fd, &execbuf)) {
+ execbuf.flags = 0;
+ gem_execbuf(fd, &execbuf);
+ }
+ gem_sync(fd, handle);
+ execbuf.buffers_ptr = to_user_pointer(obj);
+ execbuf.buffer_count = 2;
+
+ igt_fork(child, nengine) {
+ struct timespec start, now;
+ unsigned int count = 0;
+
+ obj[0].handle = gem_create(fd, 4096);
+ execbuf.flags |= engine[child];
+ gem_execbuf(fd, &execbuf);
+ gem_sync(fd, obj[0].handle);
+
+ clock_gettime(CLOCK_MONOTONIC, &start);
+ do {
+ for (int loop = 0; loop < 64; loop++) {
+ execbuf.rsvd1 = contexts[loop % 64];
+ gem_execbuf(fd, &execbuf);
+ }
+ count += 64;
+ clock_gettime(CLOCK_MONOTONIC, &now);
+ } while (elapsed(&start, &now) < timeout);
+ gem_sync(fd, obj[0].handle);
+ clock_gettime(CLOCK_MONOTONIC, &now);
+ gem_close(fd, obj[0].handle);
+
+ igt_info("[%d] %s: %'u cycles: %.3fus%s\n",
+ child, name[child], count, elapsed(&start, &now)*1e6 / count,
+ flags & INTERRUPTIBLE ? " (interruptible)" : "");
+ }
+ igt_waitchildren();
+
+ for (n = 0; n < 64; n++)
+ gem_context_destroy(fd, contexts[n]);
+}
+
igt_main
{
const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
@@ -177,6 +252,11 @@ igt_main
single(fd, light, e, INTERRUPTIBLE, ncpus, 150);
}

+ igt_subtest("basic-all")
+ all(fd, light, 0, 20);
+ igt_subtest("basic-all-heavy")
+ all(fd, heavy, 0, 20);
+
igt_fixture {
igt_stop_hang_detector();
gem_close(fd, heavy);
--
2.13.3