[igt-dev] [PATCH i-g-t v4] tests/kms_async_flips: Add test to validate asynchronous flips

* [igt-dev] [PATCH i-g-t v4] tests/kms_async_flips: Add test to validate asynchronous flips
@ 2020-08-06 13:29 Karthik B S
  2020-08-06 14:26 ` [igt-dev] ✓ Fi.CI.BAT: success for tests/kms_async_flips: Add test to validate asynchronous flips (rev2) Patchwork
                   ` (2 more replies)
  0 siblings, 3 replies; 11+ messages in thread
From: Karthik B S @ 2020-08-06 13:29 UTC (permalink / raw)
  To: igt-dev; +Cc: michel, daniel.vetter

Asynchronous flips are issued using the page flip IOCTL.
The test consists of two subtests. The first subtest waits for
the page flip event to be received before giving the next flip,
and the second subtest doesn't wait for page flip events.

The test passes if the IOCTL is successful.

v2: -Add authors in the test file. (Paulo)
    -Reduce the run time and timeouts to suit IGT needs. (Paulo)
    -Replace igt_debug's with igt_assert's to catch slow flips. (Paulo)
    -Follow IGT coding style regarding spaces. (Paulo)
    -Make set up code part of igt_fixture. (Paulo)
    -Skip the test if async flips are not supported. (Paulo)
    -Replace suggested-by. (Paulo)
    -Added description for test and subtests.

v3: -Rename the test to kms_async_flips. (Paulo)
    -Modify the TODO comment. (Paulo)
    -Remove igt_debug in flip_handler. (Paulo)
    -Use drmIoctl() in has_async function. (Paulo)
    -Add more details in igt_assert in flip_handler. (Paulo)
    -Remove flag variable in flip_handler. (Paulo)
    -Call igt_assert in flip_handler after the warm up time.

v4: -Calculate the time stamp in flip_handler from userspace, as the
     kernel will return vbl timestamps and this cannot be used
     for async flips.
    -Add a new subtest to verify that the async flip time stamp
     lies in between the previous and next vblank time stamp. (Daniel)

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Karthik B S <karthik.b.s@intel.com>
---
 tests/Makefile.sources  |   1 +
 tests/kms_async_flips.c | 329 ++++++++++++++++++++++++++++++++++++++++
 tests/meson.build       |   1 +
 3 files changed, 331 insertions(+)
 create mode 100644 tests/kms_async_flips.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 269b506d..081ccb83 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -32,6 +32,7 @@ TESTS_progs = \
 	feature_discovery \
 	kms_3d \
 	kms_addfb_basic \
+	kms_async_flips \
 	kms_atomic \
 	kms_atomic_interruptible \
 	kms_atomic_transition \
diff --git a/tests/kms_async_flips.c b/tests/kms_async_flips.c
new file mode 100644
index 00000000..a3ee0519
--- /dev/null
+++ b/tests/kms_async_flips.c
@@ -0,0 +1,329 @@
+/*
+ * Copyright © 2020 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *  Paulo Zanoni <paulo.r.zanoni@intel.com>
+ *  Karthik B S <karthik.b.s@intel.com>
+ */
+
+#include "igt.h"
+#include "igt_aux.h"
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <poll.h>
+
+#define BUFS 4
+
+/*
+ * These constants can be tuned in case we start getting unexpected
+ * results in CI.
+ */
+
+#define WARM_UP_TIME 1
+#define RUN_TIME 2
+#define THRESHOLD 10
+
+IGT_TEST_DESCRIPTION("Test asynchrous page flips.");
+
+typedef struct {
+	int drm_fd;
+	uint32_t crtc_id;
+	struct igt_fb bufs[BUFS];
+	igt_display_t display;
+} data_t;
+
+uint32_t refresh_rate;
+bool warming_up;
+bool test_timestamp_flag;
+unsigned long flip_timestamp_us;
+
+static drmModeConnectorPtr find_connector_for_modeset(data_t *data)
+{
+	igt_output_t *output;
+	drmModeConnectorPtr ret = NULL;
+
+	for_each_connected_output(&data->display, output) {
+		if (output->config.connector->count_modes > 0) {
+			ret = output->config.connector;
+			break;
+		}
+	}
+
+	igt_assert_f(ret, "Connector NOT found\n");
+	return ret;
+}
+
+static void flip_handler(int fd_, unsigned int sequence, unsigned int tv_sec,
+			 unsigned int tv_usec, void *_data)
+{
+	static unsigned int last_ms;
+	unsigned int cur_ms, flip_interval;
+	struct timespec ts;
+
+	igt_assert(_data == NULL);
+
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+
+	if (test_timestamp_flag) {
+		flip_timestamp_us = ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
+	} else {
+		cur_ms =  ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
+		flip_interval = cur_ms - last_ms;
+
+		/* Skip the assert check during warm up period*/
+		if (!warming_up) {
+			igt_assert_f(flip_interval < 1000.0f / (refresh_rate * THRESHOLD),
+				     "Flip interval not significantly smaller than vblank interval\n"
+				     "Flip interval: %dms, Refresh Rate = %dHz, Threshold = %d\n",
+				     flip_interval, refresh_rate, THRESHOLD);
+		}
+	}
+
+	last_ms = cur_ms;
+}
+
+static void wait_flip_event(data_t *data)
+{
+	int ret;
+	drmEventContext evctx;
+	struct pollfd pfd;
+
+	evctx.version = 2;
+	evctx.vblank_handler = NULL;
+	evctx.page_flip_handler = flip_handler;
+
+	pfd.fd = data->drm_fd;
+	pfd.events = POLLIN;
+	pfd.revents = 0;
+
+	ret = poll(&pfd, 1, 2000);
+
+	switch (ret) {
+	case 0:
+		igt_assert_f(0, "Flip Timeout\n");
+		break;
+	case 1:
+		ret = drmHandleEvent(data->drm_fd, &evctx);
+		igt_assert(ret == 0);
+		break;
+	default:
+		/* unexpected */
+		igt_assert(0);
+	}
+}
+
+static void make_fb(data_t *data, struct igt_fb *fb,
+		    drmModeConnectorPtr connector, int index)
+{
+	uint32_t width, height;
+	int rec_width;
+
+	width = connector->modes[0].hdisplay;
+	height = connector->modes[0].vdisplay;
+
+	rec_width = width / (BUFS * 2);
+
+	igt_create_fb(data->drm_fd, width, height, DRM_FORMAT_ARGB8888,
+		      LOCAL_I915_FORMAT_MOD_X_TILED, fb);
+	igt_draw_fill_fb(data->drm_fd, fb, 0x88);
+	igt_draw_rect_fb(data->drm_fd, NULL, NULL, fb, IGT_DRAW_MMAP_CPU,
+			 rec_width * 2 + rec_width * index,
+			 height / 4, rec_width,
+			 height / 2, rand());
+}
+
+static void has_monotonic_timestamp(int fd)
+{
+	struct drm_get_cap cap = { .capability = DRM_CAP_TIMESTAMP_MONOTONIC };
+
+	igt_assert(drmIoctl(fd, DRM_IOCTL_GET_CAP, &cap) == 0);
+
+	igt_require_f(cap.value, "Monotonic timestamps not supported\n");
+}
+
+static void test_async_flip(data_t *data, bool wait_for_flips)
+{
+	int ret, frame, warm_end_frame;
+	long long int fps;
+	struct timeval start, end, diff;
+
+	if (wait_for_flips)
+		has_monotonic_timestamp(data->drm_fd);
+
+	warming_up = true;
+
+	gettimeofday(&start, NULL);
+	frame = 1;
+	do {
+		int flags = DRM_MODE_PAGE_FLIP_ASYNC;
+
+		if (wait_for_flips)
+			flags |= DRM_MODE_PAGE_FLIP_EVENT;
+
+		ret = drmModePageFlip(data->drm_fd, data->crtc_id,
+				      data->bufs[frame % 4].fb_id,
+				      flags, NULL);
+
+		igt_assert(ret == 0 || ret == -EBUSY);
+
+		if (wait_for_flips)
+			wait_flip_event(data);
+
+		gettimeofday(&end, NULL);
+		timersub(&end, &start, &diff);
+
+		/* 1s of warm-up time for the freq to stabilize */
+		if (warming_up && diff.tv_sec >= WARM_UP_TIME) {
+			warming_up = false;
+			warm_end_frame = frame;
+			start = end;
+		}
+
+		frame++;
+	} while (diff.tv_sec < RUN_TIME);
+
+	fps = (frame - warm_end_frame) * 1000 / RUN_TIME;
+	igt_assert_f((fps / 1000) > (refresh_rate * THRESHOLD),
+		     "FPS should be significantly higher than the refresh rate\n");
+}
+
+static void get_vbl_timestamp_us(data_t *data, unsigned long *vbl_time, unsigned int *seq)
+{
+	drmVBlank wait_vbl;
+	uint32_t pipe_id_flag;
+	int pipe;
+
+	memset(&wait_vbl, 0, sizeof(wait_vbl));
+	pipe = kmstest_get_pipe_from_crtc_id(data->drm_fd, data->crtc_id);
+	pipe_id_flag = kmstest_get_vbl_flag(pipe);
+
+	wait_vbl.request.type = DRM_VBLANK_RELATIVE | pipe_id_flag;
+	wait_vbl.request.sequence = 1;
+
+	igt_assert(drmIoctl(data->drm_fd, DRM_IOCTL_WAIT_VBLANK, &wait_vbl) == 0);
+	*vbl_time = wait_vbl.reply.tval_sec * 1000000 + wait_vbl.reply.tval_usec;
+	*seq = wait_vbl.reply.sequence;
+}
+
+static void test_timestamp(data_t *data)
+{
+	int flags = DRM_MODE_PAGE_FLIP_ASYNC | DRM_MODE_PAGE_FLIP_EVENT;
+	unsigned long vbl_time, vbl_time1;
+	unsigned int seq, seq1;
+	int ret;
+
+	has_monotonic_timestamp(data->drm_fd);
+	test_timestamp_flag = true;
+
+	get_vbl_timestamp_us(data, &vbl_time, &seq);
+
+	ret = drmModePageFlip(data->drm_fd, data->crtc_id,
+			      data->bufs[0].fb_id,
+			      flags, NULL);
+
+	igt_assert(ret == 0);
+
+	wait_flip_event(data);
+
+	get_vbl_timestamp_us(data, &vbl_time1, &seq1);
+
+	igt_assert_f(seq1 == seq + 1, "Vblank sequence is expected to be incremented by one\n");
+
+	igt_info("vbl1_timestamp = %ldus\nflip_timestamp = %ldus\nvbl2_timestamp = %ldus\n",
+		 vbl_time, flip_timestamp_us, vbl_time1);
+
+	igt_assert_f(vbl_time < flip_timestamp_us && vbl_time1 > flip_timestamp_us,
+		     "Async flip time stamp is expected to be in between 2 vblank time stamps\n");
+
+	test_timestamp_flag = false;
+}
+
+static bool has_async(int fd)
+{
+	struct drm_get_cap cap = { .capability = DRM_CAP_ASYNC_PAGE_FLIP };
+
+	igt_assert(drmIoctl(fd, DRM_IOCTL_GET_CAP, &cap) == 0);
+	return cap.value;
+}
+
+igt_main
+{
+	data_t data;
+	drmModeResPtr res;
+	drmModeConnectorPtr connector;
+	int i, ret;
+	bool async_capable;
+
+	test_timestamp_flag = false;
+
+	igt_fixture {
+		data.drm_fd = drm_open_driver_master(DRIVER_INTEL);
+		kmstest_set_vt_graphics_mode();
+		igt_display_require(&data.display, data.drm_fd);
+		igt_display_require_output(&data.display);
+
+		async_capable = has_async(data.drm_fd);
+		igt_require_f(async_capable, "Async Flip is not supported\n");
+	}
+
+	igt_describe("Make sure kernel is able to accept asynchronous flips at a fast pace.");
+	igt_subtest_group {
+		igt_fixture {
+			res = drmModeGetResources(data.drm_fd);
+			igt_assert(res);
+
+			kmstest_unset_all_crtcs(data.drm_fd, res);
+
+			connector = find_connector_for_modeset(&data);
+			data.crtc_id = kmstest_find_crtc_for_connector(data.drm_fd,
+								       res, connector, 0);
+
+			refresh_rate = connector->modes[0].vrefresh;
+
+			for (i = 0; i < BUFS; i++)
+				make_fb(&data, &data.bufs[i], connector, i);
+
+			ret = drmModeSetCrtc(data.drm_fd, data.crtc_id, data.bufs[0].fb_id, 0, 0,
+					     &connector->connector_id, 1, &connector->modes[0]);
+			igt_assert(ret == 0);
+		}
+
+		igt_describe("Wait for page flip events in between successive asynchronous flips");
+		igt_subtest("async-flip-with-page-flip-events")
+			test_async_flip(&data, true);
+		igt_describe("DO NOT wait for page flip events in between successive asynchronous flips");
+		igt_subtest("async-flip-without-page-flip-events")
+			test_async_flip(&data, false);
+
+		igt_describe("Verify that the async flip timestamp does not coincide with either previous or next vblank");
+		igt_subtest("test-time-stamp")
+			test_timestamp(&data);
+
+		igt_fixture {
+			for (i = 0; i < BUFS; i++)
+				igt_remove_fb(data.drm_fd, &data.bufs[i]);
+		}
+	}
+
+	igt_fixture
+		igt_display_fini(&data.display);
+}
diff --git a/tests/meson.build b/tests/meson.build
index 684de043..007ae30c 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -16,6 +16,7 @@ test_progs = [
 	'feature_discovery',
 	'kms_3d',
 	'kms_addfb_basic',
+	'kms_async_flips',
 	'kms_atomic',
 	'kms_atomic_interruptible',
 	'kms_atomic_transition',
-- 
2.22.0

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