@@ -70,6 +70,22 @@ config DRM_DEBUG_SELFTEST
If in doubt, say "N".
+config DRM_KUNIT_TEST
+ tristate "KUnit tests for DRM" if !KUNIT_ALL_TESTS
+ depends on DRM && KUNIT=y
+ select DRM_KMS_HELPER
+ default KUNIT_ALL_TESTS
+ help
+ This builds unit tests for DRM. This option is not useful for
+ distributions or general kernels, but only for kernel
+ developers working on DRM and associated drivers.
+
+ For more information on KUnit and unit tests in general,
+ please refer to the KUnit documentation in
+ Documentation/dev-tools/kunit/.
+
+ If in doubt, say "N".
+
config DRM_KMS_HELPER
tristate
depends on DRM
@@ -76,6 +76,7 @@ obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o
#
obj-$(CONFIG_DRM_DEBUG_SELFTEST) += selftests/
+obj-$(CONFIG_DRM_KUNIT_TEST) += kunit/
obj-$(CONFIG_DRM_MIPI_DBI) += drm_mipi_dbi.o
obj-$(CONFIG_DRM_MIPI_DSI) += drm_mipi_dsi.o
new file mode 100644
@@ -0,0 +1,3 @@
+CONFIG_KUNIT=y
+CONFIG_DRM=y
+CONFIG_DRM_KUNIT_TEST=y
new file mode 100644
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_DRM_KUNIT_TEST) += drm_format_helper_test.o
new file mode 100644
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <kunit/test.h>
+
+#include <drm/drm_device.h>
+#include <drm/drm_file.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_mode.h>
+#include <drm/drm_print.h>
+#include <drm/drm_rect.h>
+
+#include "../drm_crtc_internal.h"
+
+#define TEST_BUF_SIZE 50
+
+struct xrgb8888_to_rgb332_case {
+ const char *name;
+ unsigned int pitch;
+ unsigned int dst_pitch;
+ struct drm_rect clip;
+ const u32 xrgb8888[TEST_BUF_SIZE];
+ const u8 expected[4 * TEST_BUF_SIZE];
+};
+
+static struct xrgb8888_to_rgb332_case xrgb8888_to_rgb332_cases[] = {
+ {
+ .name = "Single pixel source buffer",
+ .pitch = 1 * 4,
+ .dst_pitch = 0,
+ .clip = DRM_RECT_INIT(0, 0, 1, 1),
+ .xrgb8888 = { 0x01FF0000 },
+ .expected = { 0xE0 },
+ },
+ {
+ .name = "Single pixel clip rectangle",
+ .pitch = 2 * 4,
+ .dst_pitch = 0,
+ .clip = DRM_RECT_INIT(1, 1, 1, 1),
+ .xrgb8888 = {
+ 0x00000000, 0x00000000,
+ 0x00000000, 0x10FF0000,
+ },
+ .expected = { 0xE0 },
+ },
+ {
+ /* Well known colors, different values for the X in XRGB8888 to
+ * make sure it is ignored. Partial clip area.
+ */
+ .name = "White, black, red, green, blue, magenta, yellow, cyan",
+ .pitch = 4 * 4,
+ .dst_pitch = 0,
+ .clip = DRM_RECT_INIT(1, 1, 2, 4),
+ .xrgb8888 = {
+ 0x00000000, 0x00000000, 0x00000000, 0x00000000,
+ 0x00000000, 0x11FFFFFF, 0x22000000, 0x00000000,
+ 0x00000000, 0x33FF0000, 0x4400FF00, 0x00000000,
+ 0x00000000, 0x550000FF, 0x66FF00FF, 0x00000000,
+ 0x00000000, 0x77FFFF00, 0x8800FFFF, 0x00000000,
+ },
+ .expected = {
+ 0xFF, 0x00,
+ 0xE0, 0x1C,
+ 0x03, 0xE3,
+ 0xFC, 0x1F,
+ },
+ },
+ {
+ /* Randomly picked colors. Full buffer within the clip area. */
+ .name = "Destination pitch",
+ .pitch = 3 * 4,
+ .dst_pitch = 5,
+ .clip = DRM_RECT_INIT(0, 0, 3, 3),
+ .xrgb8888 = {
+ 0xA10E449C, 0xB1114D05, 0xC1A80303,
+ 0xD16C7073, 0xA20E449C, 0xB2114D05,
+ 0xC2A80303, 0xD26C7073, 0xA30E449C,
+ },
+ .expected = {
+ 0x0A, 0x08, 0xA0, 0x00, 0x00,
+ 0x6D, 0x0A, 0x08, 0x00, 0x00,
+ 0xA0, 0x6D, 0x0A, 0x00, 0x00,
+ },
+ },
+};
+
+/*
+ * conversion_buf_size - Return the destination buffer size required to convert
+ * between formats.
+ * @src_format: source buffer pixel format (DRM_FORMAT_*)
+ * @dst_format: destination buffer pixel format (DRM_FORMAT_*)
+ * @dst_pitch: Number of bytes between two consecutive scanlines within dst
+ * @clip: Clip rectangle area to convert
+ *
+ * Returns:
+ * The size of the destination buffer or negative value on error.
+ */
+static size_t conversion_buf_size(u32 src_format, u32 dst_format,
+ unsigned int dst_pitch,
+ const struct drm_rect *clip)
+{
+ const struct drm_format_info *src_fi = drm_format_info(src_format);
+ const struct drm_format_info *dst_fi = drm_format_info(dst_format);
+ size_t width = drm_rect_width(clip);
+ size_t src_nbytes;
+
+ if (!src_fi || !dst_fi)
+ return -EINVAL;
+
+ if (dst_pitch)
+ width = dst_pitch;
+
+ src_nbytes = width * drm_rect_height(clip) * src_fi->cpp[0];
+ if (!src_nbytes)
+ return 0;
+
+ return (src_nbytes * dst_fi->cpp[0]) / src_fi->cpp[0];
+}
+
+static void xrgb8888_to_rgb332_case_desc(struct xrgb8888_to_rgb332_case *t,
+ char *desc)
+{
+ strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(xrgb8888_to_rgb332, xrgb8888_to_rgb332_cases,
+ xrgb8888_to_rgb332_case_desc);
+
+static void xrgb8888_to_rgb332_test(struct kunit *test)
+{
+ const struct xrgb8888_to_rgb332_case *params = test->param_value;
+ size_t dst_size;
+ __u8 *dst = NULL;
+
+ struct drm_framebuffer fb = {
+ .format = drm_format_info(DRM_FORMAT_XRGB8888),
+ .pitches = { params->pitch, 0, 0 },
+ };
+
+ dst_size = conversion_buf_size(DRM_FORMAT_XRGB8888, DRM_FORMAT_RGB332,
+ params->dst_pitch, ¶ms->clip);
+ KUNIT_ASSERT_GT(test, dst_size, 0);
+
+ dst = kunit_kzalloc(test, dst_size, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dst);
+
+ drm_fb_xrgb8888_to_rgb332(dst, params->dst_pitch, params->xrgb8888,
+ &fb, ¶ms->clip);
+ KUNIT_EXPECT_EQ(test, memcmp(dst, params->expected, dst_size), 0);
+}
+
+static struct kunit_case drm_format_helper_test_cases[] = {
+ KUNIT_CASE_PARAM(xrgb8888_to_rgb332_test,
+ xrgb8888_to_rgb332_gen_params),
+ {}
+};
+
+static struct kunit_suite drm_format_helper_test_suite = {
+ .name = "drm-format-helper-test",
+ .test_cases = drm_format_helper_test_cases,
+};
+
+kunit_test_suite(drm_format_helper_test_suite);
+
+MODULE_DESCRIPTION("KUnit tests for the drm_format_helper APIs");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("José Expósito <jose.exposito89@gmail.com>");
Test the conversion from XRGB8888 to RGB332. What is tested? - Different values for the X in XRGB8888 to make sure it is ignored - Different clip values: Single pixel and full and partial buffer - Well known colors: White, black, red, green, blue, magenta, yellow and cyan - Other colors: Randomly picked - Destination pitch How to run the tests? $ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm/kunit \ --kconfig_add CONFIG_VIRTIO_UML=y \ --kconfig_add CONFIG_UML_PCI_OVER_VIRTIO=y Suggested-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Signed-off-by: José Expósito <jose.exposito89@gmail.com> --- drivers/gpu/drm/Kconfig | 16 ++ drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/kunit/.kunitconfig | 3 + drivers/gpu/drm/kunit/Makefile | 3 + .../gpu/drm/kunit/drm_format_helper_test.c | 169 ++++++++++++++++++ 5 files changed, 192 insertions(+) create mode 100644 drivers/gpu/drm/kunit/.kunitconfig create mode 100644 drivers/gpu/drm/kunit/Makefile create mode 100644 drivers/gpu/drm/kunit/drm_format_helper_test.c