[igt-dev] [PATCH i-g-t v4 21/21] chamelium: Add a display test for randomized planes

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

This introduces a new test for the Chamelium, that sets up planes
with randomized properties such as the format, dimensions, position,
in-framebuffer offsets and stride. The Chamelium capture is checked
against the reference generated by cairo with either a CRC or the
checkerboard-specific comparison method.

This test also includes testing of the VC4-specific T-tiled and
SAND-tiled modes, in all formats supported by the hardware.

Since this test does not share much with previous Chamelium display
tests (especially regarding KMS configuration), most of the code is
not shared with other tests.

This test can be derived with reproducible properties for regression
testing in the future. For now, it serves as a fuzzing test

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
 tests/kms_chamelium.c | 438 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 438 insertions(+)

diff --git a/tests/kms_chamelium.c b/tests/kms_chamelium.c
index f332592b4edb..e07159501c87 100644
--- a/tests/kms_chamelium.c
+++ b/tests/kms_chamelium.c
@@ -26,6 +26,7 @@
 
 #include "config.h"
 #include "igt.h"
+#include "igt_vc4.h"
 
 #include <fcntl.h>
 #include <string.h>
@@ -703,6 +704,435 @@ test_display_frame_dump(data_t *data, struct chamelium_port *port)
 	drmModeFreeConnector(connector);
 }
 
+static void select_tiled_modifier(igt_plane_t *plane, uint32_t width,
+				  uint32_t height, uint32_t format,
+				  uint64_t *modifier)
+{
+	if (igt_plane_has_format_mod(plane, format,
+				     DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED)) {
+		igt_debug("Selecting VC4 T-tiling\n");
+
+		*modifier = DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED;
+	} else if (igt_plane_has_format_mod(plane, format,
+					    DRM_FORMAT_MOD_BROADCOM_SAND256)) {
+		/* Randomize the column height to less than twice the minimum. */
+		size_t column_height = (rand() % height) + height;
+
+		igt_debug("Selecting VC4 SAND256 tiling with column height %ld\n",
+			  column_height);
+
+		*modifier = DRM_FORMAT_MOD_BROADCOM_SAND256_COL_HEIGHT(column_height);
+	} else {
+		*modifier = DRM_FORMAT_MOD_LINEAR;
+	}
+}
+
+static void randomize_plane_format_stride(igt_plane_t *plane,
+					  uint32_t width, uint32_t height,
+					  uint32_t *format, uint64_t *modifier,
+					  size_t *stride, bool allow_yuv)
+{
+	size_t stride_min;
+	uint32_t *formats_array;
+	unsigned int formats_count;
+	unsigned int count = 0;
+	unsigned int i;
+	bool tiled;
+	int index;
+
+	igt_format_array_fill(&formats_array, &formats_count, allow_yuv);
+
+	/* First pass to count the supported formats. */
+	for (i = 0; i < formats_count; i++)
+		if (igt_plane_has_format_mod(plane, formats_array[i],
+					     DRM_FORMAT_MOD_LINEAR))
+			count++;
+
+	igt_assert(count > 0);
+
+	index = rand() % count;
+
+	/* Second pass to get the index-th supported format. */
+	for (i = 0; i < formats_count; i++) {
+		if (!igt_plane_has_format_mod(plane, formats_array[i],
+					      DRM_FORMAT_MOD_LINEAR))
+			continue;
+
+		if (!index--) {
+			*format = formats_array[i];
+			break;
+		}
+	}
+
+	free(formats_array);
+
+	igt_assert(index < 0);
+
+	stride_min = width * igt_format_plane_bpp(*format, 0) / 8;
+
+	/* Randomize the stride to less than twice the minimum. */
+	*stride = (rand() % stride_min) + stride_min;
+
+	/* Pixman requires the stride to be aligned to 32-byte words. */
+	*stride = ALIGN(*stride, sizeof(uint32_t));
+
+	/* Randomize the use of a tiled mode with a 1/4 probability. */
+	tiled = ((rand() % 4) == 0);
+
+	if (tiled)
+		select_tiled_modifier(plane, width, height, *format, modifier);
+	else
+		*modifier = DRM_FORMAT_MOD_LINEAR;
+}
+
+static void randomize_plane_dimensions(drmModeModeInfo *mode,
+				       uint32_t *width, uint32_t *height,
+				       uint32_t *src_w, uint32_t *src_h,
+				       uint32_t *src_x, uint32_t *src_y,
+				       uint32_t *crtc_w, uint32_t *crtc_h,
+				       int32_t *crtc_x, int32_t *crtc_y,
+				       bool allow_scaling)
+{
+	double ratio;
+
+	/* Randomize width and height in the mode dimensions range. */
+	*width = (rand() % mode->hdisplay) + 1;
+	*height = (rand() % mode->vdisplay) + 1;
+
+	/* Randomize source offset in the first half of the original size. */
+	*src_x = rand() % (*width / 2);
+	*src_y = rand() % (*height / 2);
+
+	/* The source size only includes the active source area. */
+	*src_w = *width - *src_x;
+	*src_h = *height - *src_y;
+
+	if (allow_scaling) {
+		*crtc_w = (rand() % mode->hdisplay) + 1;
+		*crtc_h = (rand() % mode->vdisplay) + 1;
+
+		/*
+		 * Don't bother with scaling if dimensions are quite close in
+		 * order to get non-scaling cases more frequently. Also limit
+		 * scaling to 3x to avoid agressive filtering that makes
+		 * comparison less reliable.
+		 */
+
+		ratio = ((double) *crtc_w / *src_w);
+		if (ratio > 0.8 && ratio < 1.2)
+			*crtc_w = *src_w;
+		else if (ratio > 3.0)
+			*crtc_w = *src_w * 3;
+
+		ratio = ((double) *crtc_h / *src_h);
+		if (ratio > 0.8 && ratio < 1.2)
+			*crtc_h = *src_h;
+		else if (ratio > 3.0)
+			*crtc_h = *src_h * 3;
+	} else {
+		*crtc_w = *src_w;
+		*crtc_h = *src_h;
+	}
+
+	if (*crtc_w != *src_w || *crtc_h != *src_h) {
+		/*
+		 * When scaling is involved, make sure to not go off-bounds or
+		 * scaled clipping may result in decimal dimensions, that most
+		 * drivers don't support.
+		 */
+		*crtc_x = rand() % (mode->hdisplay - *crtc_w);
+		*crtc_y = rand() % (mode->vdisplay - *crtc_h);
+	} else {
+		/*
+		 * Randomize the on-crtc position and allow the plane to go
+		 * off-display by less than half of its on-crtc dimensions.
+		 */
+		*crtc_x = (rand() % mode->hdisplay) - *crtc_w / 2;
+		*crtc_y = (rand() % mode->vdisplay) - *crtc_h / 2;
+	}
+}
+
+static void blit_plane_cairo(data_t *data, cairo_surface_t *result,
+			     uint32_t src_w, uint32_t src_h,
+			     uint32_t src_x, uint32_t src_y,
+			     uint32_t crtc_w, uint32_t crtc_h,
+			     int32_t crtc_x, int32_t crtc_y,
+			     struct igt_fb *fb)
+{
+	cairo_surface_t *surface;
+	cairo_surface_t *clipped_surface;
+	cairo_t *cr;
+
+	surface = igt_get_cairo_surface(data->drm_fd, fb);
+
+	if (src_x || src_y) {
+		clipped_surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24,
+							     src_w, src_h);
+
+		cr = cairo_create(clipped_surface);
+
+		cairo_translate(cr, -1. * src_x, -1. * src_y);
+
+		cairo_set_source_surface(cr, surface, 0, 0);
+
+		cairo_paint(cr);
+		cairo_surface_flush(clipped_surface);
+
+		cairo_destroy(cr);
+	} else {
+		clipped_surface = surface;
+	}
+
+	cr = cairo_create(result);
+
+	cairo_translate(cr, crtc_x, crtc_y);
+
+	if (src_w != crtc_w || src_h != crtc_h) {
+		cairo_scale(cr, (double) crtc_w / src_w,
+			    (double) crtc_h / src_h);
+	}
+
+	cairo_set_source_surface(cr, clipped_surface, 0, 0);
+	cairo_surface_destroy(clipped_surface);
+
+	if (src_w != crtc_w || src_h != crtc_h) {
+		cairo_pattern_set_filter(cairo_get_source(cr),
+					 CAIRO_FILTER_BILINEAR);
+		cairo_pattern_set_extend(cairo_get_source(cr),
+					 CAIRO_EXTEND_NONE);
+	}
+
+	cairo_paint(cr);
+	cairo_surface_flush(result);
+
+	cairo_destroy(cr);
+}
+
+static void configure_plane(igt_plane_t *plane, uint32_t src_w, uint32_t src_h,
+			    uint32_t src_x, uint32_t src_y, uint32_t crtc_w,
+			    uint32_t crtc_h, int32_t crtc_x, int32_t crtc_y,
+			    struct igt_fb *fb)
+{
+	igt_plane_set_fb(plane, fb);
+
+	igt_plane_set_position(plane, crtc_x, crtc_y);
+	igt_plane_set_size(plane, crtc_w, crtc_h);
+
+	igt_fb_set_position(fb, plane, src_x, src_y);
+	igt_fb_set_size(fb, plane, src_w, src_h);
+}
+
+static void prepare_randomized_plane(data_t *data,
+				     drmModeModeInfo *mode,
+				     igt_plane_t *plane,
+				     struct igt_fb *overlay_fb,
+				     unsigned int index,
+				     cairo_surface_t *result_surface,
+				     bool allow_scaling, bool allow_yuv)
+{
+	struct igt_fb pattern_fb;
+	uint32_t overlay_fb_w, overlay_fb_h;
+	uint32_t overlay_src_w, overlay_src_h;
+	uint32_t overlay_src_x, overlay_src_y;
+	int32_t overlay_crtc_x, overlay_crtc_y;
+	uint32_t overlay_crtc_w, overlay_crtc_h;
+	uint32_t format;
+	uint64_t modifier;
+	size_t stride;
+	bool tiled;
+	int fb_id;
+
+	randomize_plane_dimensions(mode, &overlay_fb_w, &overlay_fb_h,
+				   &overlay_src_w, &overlay_src_h,
+				   &overlay_src_x, &overlay_src_y,
+				   &overlay_crtc_w, &overlay_crtc_h,
+				   &overlay_crtc_x, &overlay_crtc_y,
+				   allow_scaling);
+
+	igt_debug("Plane %d: framebuffer size %dx%d\n", index,
+		  overlay_fb_w, overlay_fb_h);
+	igt_debug("Plane %d: on-crtc size %dx%d\n", index,
+		  overlay_crtc_w, overlay_crtc_h);
+	igt_debug("Plane %d: on-crtc position %dx%d\n", index,
+		  overlay_crtc_x, overlay_crtc_y);
+	igt_debug("Plane %d: in-framebuffer size %dx%d\n", index,
+		  overlay_src_w, overlay_src_h);
+	igt_debug("Plane %d: in-framebuffer position %dx%d\n", index,
+		  overlay_src_x, overlay_src_y);
+
+	/* Get a pattern framebuffer for the overlay plane. */
+	fb_id = chamelium_get_pattern_fb(data, overlay_fb_w, overlay_fb_h,
+					 DRM_FORMAT_XRGB8888, 32, &pattern_fb);
+	igt_assert(fb_id > 0);
+
+	randomize_plane_format_stride(plane, overlay_fb_w, overlay_fb_h,
+				      &format, &modifier, &stride, allow_yuv);
+
+	tiled = (modifier != LOCAL_DRM_FORMAT_MOD_NONE);
+
+	igt_debug("Plane %d: %s format (%s) with stride %ld\n", index,
+		  igt_format_str(format), tiled ? "tiled" : "linear", stride);
+
+	fb_id = igt_fb_convert_with_stride(overlay_fb, &pattern_fb, format,
+					   modifier, stride);
+	igt_assert(fb_id > 0);
+
+	blit_plane_cairo(data, result_surface, overlay_src_w, overlay_src_h,
+			 overlay_src_x, overlay_src_y,
+			 overlay_crtc_w, overlay_crtc_h,
+			 overlay_crtc_x, overlay_crtc_y, &pattern_fb);
+
+	configure_plane(plane, overlay_src_w, overlay_src_h,
+			overlay_src_x, overlay_src_y,
+			overlay_crtc_w, overlay_crtc_h,
+			overlay_crtc_x, overlay_crtc_y, overlay_fb);
+
+	/* Remove the original pattern framebuffer. */
+	igt_remove_fb(data->drm_fd, &pattern_fb);
+}
+
+static void test_display_planes_random(data_t *data,
+				       struct chamelium_port *port,
+				       enum chamelium_check check)
+{
+	igt_output_t *output;
+	drmModeModeInfo *mode;
+	igt_plane_t *primary_plane;
+	struct igt_fb primary_fb;
+	struct igt_fb result_fb;
+	struct igt_fb *overlay_fbs;
+	igt_crc_t *crc;
+	igt_crc_t *expected_crc;
+	struct chamelium_fb_crc_async_data *fb_crc;
+	unsigned int overlay_planes_max = 0;
+	unsigned int overlay_planes_count;
+	cairo_surface_t *result_surface;
+	int captured_frame_count;
+	bool allow_scaling;
+	bool allow_yuv;
+	unsigned int i;
+	unsigned int fb_id;
+
+	switch (check) {
+	case CHAMELIUM_CHECK_CRC:
+		allow_scaling = false;
+		allow_yuv = false;
+		break;
+	case CHAMELIUM_CHECK_CHECKERBOARD:
+		allow_scaling = true;
+		allow_yuv = true;
+		break;
+	default:
+		igt_assert(false);
+	}
+
+	srand(time(NULL));
+
+	reset_state(data, port);
+
+	/* Find the connector and pipe. */
+	output = prepare_output(data, port);
+
+	mode = igt_output_get_mode(output);
+
+	/* Get a framebuffer for the primary plane. */
+	primary_plane = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
+	igt_assert(primary_plane);
+
+	fb_id = chamelium_get_pattern_fb(data, mode->hdisplay, mode->vdisplay,
+					 DRM_FORMAT_XRGB8888, 64, &primary_fb);
+	igt_assert(fb_id > 0);
+
+	/* Get a framebuffer for the cairo composition result. */
+	fb_id = igt_create_fb(data->drm_fd, mode->hdisplay,
+			      mode->vdisplay, DRM_FORMAT_XRGB8888,
+			      LOCAL_DRM_FORMAT_MOD_NONE, &result_fb);
+	igt_assert(fb_id > 0);
+
+	result_surface = igt_get_cairo_surface(data->drm_fd, &result_fb);
+
+	/* Paint the primary framebuffer on the result surface. */
+	blit_plane_cairo(data, result_surface, 0, 0, 0, 0, 0, 0, 0, 0,
+			 &primary_fb);
+
+	/* Configure the primary plane. */
+	igt_plane_set_fb(primary_plane, &primary_fb);
+
+	overlay_planes_max =
+		igt_output_count_plane_type(output, DRM_PLANE_TYPE_OVERLAY);
+
+	/* Limit the number of planes to a reasonable scene. */
+	overlay_planes_max = max(overlay_planes_max, 4);
+
+	overlay_planes_count = (rand() % overlay_planes_max) + 1;
+	igt_debug("Using %d overlay planes\n", overlay_planes_count);
+
+	overlay_fbs = calloc(sizeof(struct igt_fb), overlay_planes_count);
+
+	for (i = 0; i < overlay_planes_count; i++) {
+		struct igt_fb *overlay_fb = &overlay_fbs[i];
+		igt_plane_t *plane =
+			igt_output_get_plane_type_index(output,
+							DRM_PLANE_TYPE_OVERLAY,
+							i);
+		igt_assert(plane);
+
+		prepare_randomized_plane(data, mode, plane, overlay_fb, i,
+					 result_surface, allow_scaling,
+					 allow_yuv);
+	}
+
+	cairo_surface_destroy(result_surface);
+
+	if (check == CHAMELIUM_CHECK_CRC)
+		fb_crc = chamelium_calculate_fb_crc_async_start(data->drm_fd,
+								&result_fb);
+
+	igt_display_commit2(&data->display, COMMIT_ATOMIC);
+
+	if (check == CHAMELIUM_CHECK_CRC) {
+		chamelium_capture(data->chamelium, port, 0, 0, 0, 0, 1);
+		crc = chamelium_read_captured_crcs(data->chamelium,
+						   &captured_frame_count);
+
+		igt_assert(captured_frame_count == 1);
+
+		expected_crc = chamelium_calculate_fb_crc_async_finish(fb_crc);
+
+		chamelium_assert_crc_eq_or_dump(data->chamelium,
+						expected_crc, crc,
+						&result_fb, 0);
+
+		free(expected_crc);
+		free(crc);
+	} else if (check == CHAMELIUM_CHECK_CHECKERBOARD) {
+		struct chamelium_frame_dump *dump;
+
+		dump = chamelium_port_dump_pixels(data->chamelium, port, 0, 0,
+						  0, 0);
+		chamelium_assert_frame_match_or_dump(data->chamelium, port,
+						     dump, &result_fb, check);
+		chamelium_destroy_frame_dump(dump);
+	}
+
+	for (i = 0; i < overlay_planes_count; i++) {
+		struct igt_fb *overlay_fb = &overlay_fbs[i];
+		igt_plane_t *plane;
+
+		plane = igt_output_get_plane_type_index(output,
+							DRM_PLANE_TYPE_OVERLAY,
+							i);
+		igt_assert(plane);
+
+		igt_remove_fb(data->drm_fd, overlay_fb);
+	}
+
+	free(overlay_fbs);
+
+	igt_remove_fb(data->drm_fd, &primary_fb);
+	igt_remove_fb(data->drm_fd, &result_fb);
+}
+
 static void
 test_hpd_without_ddc(data_t *data, struct chamelium_port *port)
 {
@@ -977,6 +1407,10 @@ igt_main
 			test_display_one_mode(&data, port, DRM_FORMAT_XRGB1555,
 					      CHAMELIUM_CHECK_CRC, 1);
 
+		connector_subtest("hdmi-crc-planes-random", HDMIA)
+			test_display_planes_random(&data, port,
+						   CHAMELIUM_CHECK_CRC);
+
 		connector_subtest("hdmi-cmp-nv12", HDMIA)
 			test_display_one_mode(&data, port, DRM_FORMAT_NV12,
 					      CHAMELIUM_CHECK_CHECKERBOARD, 1);
@@ -1009,6 +1443,10 @@ igt_main
 			test_display_one_mode(&data, port, DRM_FORMAT_YVU422,
 					      CHAMELIUM_CHECK_CHECKERBOARD, 1);
 
+		connector_subtest("hdmi-cmp-planes-random", HDMIA)
+			test_display_planes_random(&data, port,
+						   CHAMELIUM_CHECK_CHECKERBOARD);
+
 		connector_subtest("hdmi-frame-dump", HDMIA)
 			test_display_frame_dump(&data, port);
 	}
-- 
2.20.1

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