[Intel-gfx] [PATCH i-g-t 2/3] tests/gem_eio: Speed up test execution

Tvrtko Ursulin tursulin at ursulin.net
Thu Mar 22 11:17:11 UTC 2018


From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

If we stop relying on regular GPU hangs to be detected, but trigger them
manually as soon as we know our batch of interest is actually executing
on the GPU, we can dramatically speed up various subtests.

This is enabled by the pollable spin batch added in the previous patch.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Suggested-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Antonio Argenziano <antonio.argenziano at intel.com>
---
Note that the 'wait' subtest is mysteriously hanging for me in the no-op
batch send by gem_test_engines, but only on RCS engine. TBD while I am
getting some CI results.
---
 lib.tar         | Bin 0 -> 102400 bytes
 tests/gem_eio.c |  97 ++++++++++++++++++++++++++++++++++++++++----------------
 2 files changed, 70 insertions(+), 27 deletions(-)
 create mode 100644 lib.tar

diff --git a/lib.tar b/lib.tar
new file mode 100644
index 0000000000000000000000000000000000000000..ea04fad219a87f2e975852989526f8da4c9b7d6d
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diff --git a/tests/gem_eio.c b/tests/gem_eio.c
index 4bcc5937db39..93400056124b 100644
--- a/tests/gem_eio.c
+++ b/tests/gem_eio.c
@@ -71,26 +71,23 @@ static void trigger_reset(int fd)
 	gem_quiescent_gpu(fd);
 }
 
-static void wedge_gpu(int fd)
+static void manual_hang(int drm_fd)
 {
-	/* First idle the GPU then disable GPU resets before injecting a hang */
-	gem_quiescent_gpu(fd);
-
-	igt_require(i915_reset_control(false));
+	int dir = igt_debugfs_dir(drm_fd);
 
-	igt_debug("Wedging GPU by injecting hang\n");
-	igt_post_hang_ring(fd, igt_hang_ring(fd, I915_EXEC_DEFAULT));
+	igt_sysfs_set(dir, "i915_wedged", "-1");
 
-	igt_assert(i915_reset_control(true));
+	close(dir);
 }
 
-static void wedgeme(int drm_fd)
+static void wedge_gpu(int fd)
 {
-	int dir = igt_debugfs_dir(drm_fd);
-
-	igt_sysfs_set(dir, "i915_wedged", "-1");
+	/* First idle the GPU then disable GPU resets before injecting a hang */
+	gem_quiescent_gpu(fd);
 
-	close(dir);
+	igt_require(i915_reset_control(false));
+	manual_hang(fd);
+	igt_assert(i915_reset_control(true));
 }
 
 static int __gem_throttle(int fd)
@@ -149,29 +146,66 @@ static int __gem_wait(int fd, uint32_t handle, int64_t timeout)
 	return err;
 }
 
+static igt_spin_t * __spin_poll(int fd, uint32_t ctx, unsigned long flags)
+{
+	if (gem_can_store_dword(fd, flags))
+		return __igt_spin_batch_new_poll(fd, ctx, flags);
+	else
+		return __igt_spin_batch_new(fd, ctx, flags, 0);
+}
+
+static void __spin_wait(int fd, igt_spin_t *spin)
+{
+	if (spin->running) {
+		while (!*((volatile bool *)spin->running))
+			;
+	} else {
+		igt_debug("__spin_wait - usleep mode\n");
+		usleep(500e3); /* Better than nothing! */
+	}
+}
+
+/*
+ * Wedge the GPU when we know our batch is running.
+ */
+static void wedge_after_running(int fd, igt_spin_t *spin)
+{
+	__spin_wait(fd, spin);
+	manual_hang(fd);
+}
+
 static void test_wait(int fd)
 {
-	igt_hang_t hang;
+	struct timespec ts = { };
+	igt_spin_t *hang;
 
 	igt_require_gem(fd);
 
+	igt_nsec_elapsed(&ts);
+
 	/* If the request we wait on completes due to a hang (even for
 	 * that request), the user expects the return value to 0 (success).
 	 */
-	hang = igt_hang_ring(fd, I915_EXEC_DEFAULT);
-	igt_assert_eq(__gem_wait(fd, hang.handle, -1), 0);
-	igt_post_hang_ring(fd, hang);
+	igt_require(i915_reset_control(true));
+	hang = __spin_poll(fd, 0, I915_EXEC_DEFAULT);
+	wedge_after_running(fd, hang);
+	igt_assert_eq(__gem_wait(fd, hang->handle, -1), 0);
+	igt_spin_batch_free(fd, hang);
 
 	/* If the GPU is wedged during the wait, again we expect the return
 	 * value to be 0 (success).
 	 */
 	igt_require(i915_reset_control(false));
-	hang = igt_hang_ring(fd, I915_EXEC_DEFAULT);
-	igt_assert_eq(__gem_wait(fd, hang.handle, -1), 0);
-	igt_post_hang_ring(fd, hang);
+	hang = __spin_poll(fd, 0, I915_EXEC_DEFAULT);
+	wedge_after_running(fd, hang);
+	igt_assert_eq(__gem_wait(fd, hang->handle, -1), 0);
+	igt_spin_batch_free(fd, hang);
 	igt_require(i915_reset_control(true));
 
 	trigger_reset(fd);
+
+	/* HACK for CI */
+	igt_assert(igt_nsec_elapsed(&ts) < 5e9);
 }
 
 static void test_suspend(int fd, int state)
@@ -181,7 +215,7 @@ static void test_suspend(int fd, int state)
 
 	/* Check we can suspend when the driver is already wedged */
 	igt_require(i915_reset_control(false));
-	wedgeme(fd);
+	manual_hang(fd);
 
 	igt_system_suspend_autoresume(state, SUSPEND_TEST_DEVICES);
 
@@ -209,11 +243,10 @@ static void test_inflight(int fd)
 		int fence[64]; /* conservative estimate of ring size */
 
 		gem_quiescent_gpu(fd);
-
 		igt_debug("Starting %s on engine '%s'\n", __func__, e__->name);
 		igt_require(i915_reset_control(false));
 
-		hang = __igt_spin_batch_new(fd, 0, engine, 0);
+		hang = __spin_poll(fd, 0, engine);
 		obj[0].handle = hang->handle;
 
 		memset(&execbuf, 0, sizeof(execbuf));
@@ -227,6 +260,8 @@ static void test_inflight(int fd)
 			igt_assert(fence[n] != -1);
 		}
 
+		wedge_after_running(fd, hang);
+
 		igt_assert_eq(__gem_wait(fd, obj[1].handle, -1), 0);
 		for (unsigned int n = 0; n < ARRAY_SIZE(fence); n++) {
 			igt_assert_eq(sync_fence_status(fence[n]), -EIO);
@@ -256,7 +291,7 @@ static void test_inflight_suspend(int fd)
 	obj[1].handle = gem_create(fd, 4096);
 	gem_write(fd, obj[1].handle, 0, &bbe, sizeof(bbe));
 
-	hang = __igt_spin_batch_new(fd, 0, 0, 0);
+	hang = __spin_poll(fd, 0, 0);
 	obj[0].handle = hang->handle;
 
 	memset(&execbuf, 0, sizeof(execbuf));
@@ -273,6 +308,8 @@ static void test_inflight_suspend(int fd)
 	igt_set_autoresume_delay(30);
 	igt_system_suspend_autoresume(SUSPEND_STATE_MEM, SUSPEND_TEST_NONE);
 
+	wedge_after_running(fd, hang);
+
 	igt_assert_eq(__gem_wait(fd, obj[1].handle, -1), 0);
 	for (unsigned int n = 0; n < ARRAY_SIZE(fence); n++) {
 		igt_assert_eq(sync_fence_status(fence[n]), -EIO);
@@ -330,7 +367,7 @@ static void test_inflight_contexts(int fd)
 		igt_debug("Starting %s on engine '%s'\n", __func__, e__->name);
 		igt_require(i915_reset_control(false));
 
-		hang = __igt_spin_batch_new(fd, 0, engine, 0);
+		hang = __spin_poll(fd, ctx[0], engine);
 		obj[0].handle = hang->handle;
 
 		memset(&execbuf, 0, sizeof(execbuf));
@@ -345,6 +382,8 @@ static void test_inflight_contexts(int fd)
 			igt_assert(fence[n] != -1);
 		}
 
+		wedge_after_running(fd, hang);
+
 		igt_assert_eq(__gem_wait(fd, obj[1].handle, -1), 0);
 		for (unsigned int n = 0; n < ARRAY_SIZE(fence); n++) {
 			igt_assert_eq(sync_fence_status(fence[n]), -EIO);
@@ -375,7 +414,7 @@ static void test_inflight_external(int fd)
 	fence = igt_cork_plug(&cork, fd);
 
 	igt_require(i915_reset_control(false));
-	hang = __igt_spin_batch_new(fd, 0, 0, 0);
+	hang = __spin_poll(fd, 0, 0);
 
 	memset(&obj, 0, sizeof(obj));
 	obj.handle = gem_create(fd, 4096);
@@ -393,6 +432,8 @@ static void test_inflight_external(int fd)
 	fence = execbuf.rsvd2 >> 32;
 	igt_assert(fence != -1);
 
+	wedge_after_running(fd, hang);
+
 	gem_sync(fd, hang->handle); /* wedged, with an unready batch */
 	igt_assert(!gem_bo_busy(fd, hang->handle));
 	igt_assert(gem_bo_busy(fd, obj.handle));
@@ -420,7 +461,7 @@ static void test_inflight_internal(int fd)
 	igt_require(gem_has_exec_fence(fd));
 
 	igt_require(i915_reset_control(false));
-	hang = __igt_spin_batch_new(fd, 0, 0, 0);
+	hang = __spin_poll(fd, 0, 0);
 
 	memset(obj, 0, sizeof(obj));
 	obj[0].handle = hang->handle;
@@ -441,6 +482,8 @@ static void test_inflight_internal(int fd)
 		nfence++;
 	}
 
+	wedge_after_running(fd, hang);
+
 	igt_assert_eq(__gem_wait(fd, obj[1].handle, -1), 0);
 	while (nfence--) {
 		igt_assert_eq(sync_fence_status(fences[nfence]), -EIO);
-- 
2.14.1



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