drm/i915: Simple selftest to exercise live requests

Just create several batches of requests and expect it to not fall over!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-13-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_request.c b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
index 6fa148b..610f89e 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
@@ -22,6 +22,8 @@
  *
  */
 
+#include <linux/prime_numbers.h>
+
 #include "../i915_selftest.h"
 
 #include "mock_gem_device.h"
@@ -198,3 +200,148 @@ int i915_gem_request_mock_selftests(void)
 
        return err;
 }
+
+struct live_test {
+       struct drm_i915_private *i915;
+       const char *func;
+       const char *name;
+
+       unsigned int reset_count;
+};
+
+static int begin_live_test(struct live_test *t,
+                          struct drm_i915_private *i915,
+                          const char *func,
+                          const char *name)
+{
+       int err;
+
+       t->i915 = i915;
+       t->func = func;
+       t->name = name;
+
+       err = i915_gem_wait_for_idle(i915, I915_WAIT_LOCKED);
+       if (err) {
+               pr_err("%s(%s): failed to idle before, with err=%d!",
+                      func, name, err);
+               return err;
+       }
+
+       i915_gem_retire_requests(i915);
+
+       i915->gpu_error.missed_irq_rings = 0;
+       t->reset_count = i915_reset_count(&i915->gpu_error);
+
+       return 0;
+}
+
+static int end_live_test(struct live_test *t)
+{
+       struct drm_i915_private *i915 = t->i915;
+
+       if (wait_for(intel_execlists_idle(i915), 1)) {
+               pr_err("%s(%s): GPU not idle\n", t->func, t->name);
+               return -EIO;
+       }
+
+       if (t->reset_count != i915_reset_count(&i915->gpu_error)) {
+               pr_err("%s(%s): GPU was reset %d times!\n",
+                      t->func, t->name,
+                      i915_reset_count(&i915->gpu_error) - t->reset_count);
+               return -EIO;
+       }
+
+       if (i915->gpu_error.missed_irq_rings) {
+               pr_err("%s(%s): Missed interrupts on engines %lx\n",
+                      t->func, t->name, i915->gpu_error.missed_irq_rings);
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static int live_nop_request(void *arg)
+{
+       struct drm_i915_private *i915 = arg;
+       struct intel_engine_cs *engine;
+       struct live_test t;
+       unsigned int id;
+       int err;
+
+       /* Submit various sized batches of empty requests, to each engine
+        * (individually), and wait for the batch to complete. We can check
+        * the overhead of submitting requests to the hardware.
+        */
+
+       mutex_lock(&i915->drm.struct_mutex);
+
+       for_each_engine(engine, i915, id) {
+               IGT_TIMEOUT(end_time);
+               struct drm_i915_gem_request *request;
+               unsigned long n, prime;
+               ktime_t times[2] = {};
+
+               err = begin_live_test(&t, i915, __func__, engine->name);
+               if (err)
+                       goto out_unlock;
+
+               for_each_prime_number_from(prime, 1, 8192) {
+                       times[1] = ktime_get_raw();
+
+                       for (n = 0; n < prime; n++) {
+                               request = i915_gem_request_alloc(engine,
+                                                                i915->kernel_context);
+                               if (IS_ERR(request)) {
+                                       err = PTR_ERR(request);
+                                       goto out_unlock;
+                               }
+
+                               /* This space is left intentionally blank.
+                                *
+                                * We do not actually want to perform any
+                                * action with this request, we just want
+                                * to measure the latency in allocation
+                                * and submission of our breadcrumbs -
+                                * ensuring that the bare request is sufficient
+                                * for the system to work (i.e. proper HEAD
+                                * tracking of the rings, interrupt handling,
+                                * etc). It also gives us the lowest bounds
+                                * for latency.
+                                */
+
+                               i915_add_request(request);
+                       }
+                       i915_wait_request(request,
+                                         I915_WAIT_LOCKED,
+                                         MAX_SCHEDULE_TIMEOUT);
+
+                       times[1] = ktime_sub(ktime_get_raw(), times[1]);
+                       if (prime == 1)
+                               times[0] = times[1];
+
+                       if (__igt_timeout(end_time, NULL))
+                               break;
+               }
+
+               err = end_live_test(&t);
+               if (err)
+                       goto out_unlock;
+
+               pr_info("Request latencies on %s: 1 = %lluns, %lu = %lluns\n",
+                       engine->name,
+                       ktime_to_ns(times[0]),
+                       prime, div64_u64(ktime_to_ns(times[1]), prime));
+       }
+
+out_unlock:
+       mutex_unlock(&i915->drm.struct_mutex);
+       return err;
+}
+
+int i915_gem_request_live_selftests(struct drm_i915_private *i915)
+{
+       static const struct i915_subtest tests[] = {
+               SUBTEST(live_nop_request),
+       };
+       return i915_subtests(tests, i915);
+}

diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index f3e17cb..09bf538 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -9,3 +9,4 @@
  * Tests are executed in order by igt/drv_selftest
  */
 selftest(sanitycheck, i915_live_sanitycheck) /* keep first (igt selfcheck) */
+selftest(requests, i915_gem_request_live_selftests)