[igt-dev] [PATCH i-g-t RFC v2 4/4] tests: Add VC4 load tracker tests

[Paul Kocialkowski <paul.kocialkowski@bootlin.com>]

This introduces new tests for the VC4 load tracking mechanism, that
will attempt to add "as many planes as possibles" in the mode
resolution. The associated sub-tests are the following:
- bandwidth-detection: checks that bandwidth limitation is detected;
- underrun-detection: checks that hardware underruns are detected;
- consistency: checks that bandwidth and underrun reports are consistent;

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
 tests/meson.build        |   1 +
 tests/vc4_load_tracker.c | 254 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 255 insertions(+)
 create mode 100644 tests/vc4_load_tracker.c

diff --git a/tests/meson.build b/tests/meson.build
index 0f12df26d9fb..beff2568cf78 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -86,6 +86,7 @@ test_progs = [
 	'vc4_create_bo',
 	'vc4_dmabuf_poll',
 	'vc4_label_bo',
+	'vc4_load_tracker',
 	'vc4_lookup_fail',
 	'vc4_purgeable_bo',
 	'vc4_tiling',
diff --git a/tests/vc4_load_tracker.c b/tests/vc4_load_tracker.c
new file mode 100644
index 000000000000..208279c7ee8f
--- /dev/null
+++ b/tests/vc4_load_tracker.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright © 2018 Bootlin
+ * Copyright © 2018 Broadcom
+ *
+ * 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.
+ */
+
+#include "igt.h"
+#include "igt_vc4.h"
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <poll.h>
+#include "vc4_drm.h"
+
+static igt_output_t *select_output(igt_display_t *display)
+{
+	igt_output_t *output;
+	enum pipe pipe;
+
+	for_each_pipe(display, pipe) {
+		for_each_valid_output_on_pipe(display, pipe, output) {
+			drmModeConnector *connector = output->config.connector;
+
+			if (connector->connection != DRM_MODE_CONNECTED)
+				continue;
+
+			igt_output_set_pipe(output, pipe);
+
+			return output;
+		}
+	}
+
+	return NULL;
+}
+
+static void setup_primary_plane(int drm_fd, igt_output_t *output,
+				uint32_t width, uint32_t height,
+				igt_plane_t **plane, struct igt_fb *fb)
+{
+	unsigned int fb_id;
+
+	*plane = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
+	igt_assert(*plane);
+
+	fb_id = igt_create_pattern_fb(drm_fd, width, height,
+				      DRM_FORMAT_ARGB8888,
+				      LOCAL_DRM_FORMAT_MOD_NONE, fb);
+	igt_assert(fb_id > 0);
+
+	igt_plane_set_fb(*plane, fb);
+}
+
+static void setup_overlay_plane(int drm_fd, igt_output_t *output,
+				unsigned int index, uint32_t width,
+				uint32_t height, struct igt_fb *fbs)
+{
+	unsigned int fb_id;
+	struct igt_fb *fb = &fbs[index];
+	igt_plane_t *plane =
+		igt_output_get_plane_type_index(output, DRM_PLANE_TYPE_OVERLAY,
+						index);
+	igt_assert(plane);
+
+	fb_id = igt_create_pattern_fb(drm_fd, width, height,
+				      DRM_FORMAT_ARGB8888,
+				      LOCAL_DRM_FORMAT_MOD_NONE, fb);
+	igt_assert(fb_id > 0);
+
+	igt_plane_set_fb(plane, fb);
+	igt_plane_set_position(plane, 10 * (index + 1), 10 * (index + 1));
+}
+
+static void cleanup_overlay_plane(int drm_fd, igt_output_t *output,
+				  unsigned int index, struct igt_fb *fbs,
+				  bool cleanup_fb)
+{
+	struct igt_fb *fb = &fbs[index];
+	igt_plane_t *plane =
+		igt_output_get_plane_type_index(output, DRM_PLANE_TYPE_OVERLAY,
+						index);
+	igt_assert(plane);
+
+	if (cleanup_fb)
+		igt_remove_fb(drm_fd, fb);
+	else
+		igt_plane_set_fb(plane, NULL);
+}
+
+static void load_tracker_test(int drm_fd, igt_display_t *display,
+			      bool test_consistency, bool test_bandwidth)
+{
+	igt_output_t *output;
+	drmModeModeInfo *mode;
+	struct igt_fb primary_fb;
+	igt_plane_t *primary_plane;
+	struct igt_fb *overlay_fbs;
+	uint32_t overlay_width, overlay_height;
+	unsigned int overlay_planes_count;
+	unsigned int count;
+	unsigned int index;
+	bool load_tracker_initial = false;
+	bool bandwidth_exceeded = false;
+	bool underrun_detected = false;
+	int underrun_count;
+	int debugfs;
+	int ret;
+
+	debugfs = igt_debugfs_dir(drm_fd);
+	igt_assert(debugfs >= 0);
+
+	underrun_count = igt_vc4_get_underrun_count(debugfs);
+	load_tracker_initial = igt_vc4_get_load_tracker(debugfs);
+
+	output = select_output(display);
+	igt_assert(output);
+
+	igt_debug("Selected connector %s\n",
+		  kmstest_connector_type_str(output->config.connector->connector_type));
+
+	mode = igt_output_get_mode(output);
+	igt_assert(mode);
+
+	setup_primary_plane(drm_fd, output, mode->hdisplay, mode->vdisplay,
+			    &primary_plane, &primary_fb);
+
+	overlay_planes_count =
+		igt_output_count_plane_type(output, DRM_PLANE_TYPE_OVERLAY);
+
+	overlay_fbs = calloc(sizeof(struct igt_fb), overlay_planes_count);
+
+	overlay_width = mode->hdisplay;
+	overlay_height = mode->vdisplay;
+
+	for (count = 1; count <= overlay_planes_count; count++) {
+		int underrun_update;
+
+		igt_debug("Using %d overlay planes with resolution %dx%d\n",
+			  overlay_planes_count, overlay_width, overlay_height);
+
+		for (index = 0; index < count; index++)
+			setup_overlay_plane(drm_fd, output, index,
+					    overlay_width, overlay_height,
+					    overlay_fbs);
+
+		igt_vc4_set_load_tracker(debugfs, true);
+
+		ret = igt_display_try_commit2(display, COMMIT_ATOMIC);
+		bandwidth_exceeded = (ret < 0 && errno == ENOSPC);
+
+		igt_debug("Bandwidth limitation exeeded: %s\n",
+			  bandwidth_exceeded ? "Yes" : "No");
+
+		igt_vc4_set_load_tracker(debugfs, false);
+
+		igt_display_commit2(display, COMMIT_ATOMIC);
+
+		igt_wait_for_vblank(drm_fd, output->pending_pipe);
+
+		underrun_update = igt_vc4_get_underrun_count(debugfs);
+
+		underrun_detected = (underrun_update > underrun_count);
+		underrun_count = underrun_update;
+
+		igt_debug("Underrun detected: %s\n",
+			  underrun_detected ? "Yes" : "No");
+
+		if (test_consistency)
+			igt_assert(bandwidth_exceeded == underrun_detected);
+
+		for (index = 0; index < count; index++)
+			cleanup_overlay_plane(drm_fd, output, index,
+					      overlay_fbs, false);
+
+		igt_display_commit2(display, COMMIT_ATOMIC);
+
+		for (index = 0; index < count; index++)
+			cleanup_overlay_plane(drm_fd, output, index,
+					      overlay_fbs, true);
+
+		if ((test_bandwidth && bandwidth_exceeded) ||
+		    (!test_bandwidth && underrun_detected))
+			break;
+	}
+
+	if (test_bandwidth)
+		igt_assert(bandwidth_exceeded);
+	else
+		igt_assert(underrun_detected);
+
+	free(overlay_fbs);
+
+	igt_plane_set_fb(primary_plane, NULL);
+
+	igt_display_commit2(display, COMMIT_ATOMIC);
+
+	igt_remove_fb(drm_fd, &primary_fb);
+
+	igt_vc4_set_load_tracker(debugfs, load_tracker_initial);
+	close(debugfs);
+}
+
+igt_main
+{
+	igt_display_t display;
+	int drm_fd;
+
+	igt_fixture {
+		drm_fd = drm_open_driver(DRIVER_VC4);
+
+		kmstest_set_vt_graphics_mode();
+
+		igt_display_require(&display, drm_fd);
+		igt_require(display.is_atomic);
+	}
+
+	igt_subtest("bandwidth-detection")
+		load_tracker_test(drm_fd, &display, false, true);
+
+	igt_subtest("underrun-detection")
+		load_tracker_test(drm_fd, &display, false, false);
+
+	igt_subtest("consistency")
+		load_tracker_test(drm_fd, &display, true, false);
+
+	igt_fixture {
+		igt_display_fini(&display);
+		kmstest_restore_vt_mode();
+		close(drm_fd);
+	}
+}
-- 
2.20.1

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