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    Subject[RFC PATCH 1/1] drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to_rgb332()
    Date
    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 know colors: White, black, red, green, blue, magenta, yellow
    and cyan
    - Other colors: Randomly picked
    - Destination pitch

    Suggested-by: Javier Martinez Canillas <javierm@redhat.com>
    Signed-off-by: José Expósito <jose.exposito89@gmail.com>
    ---
    drivers/gpu/drm/Kconfig | 12 ++
    drivers/gpu/drm/Makefile | 3 +
    drivers/gpu/drm/drm_format_helper_test.c | 166 +++++++++++++++++++++++
    3 files changed, 181 insertions(+)
    create mode 100644 drivers/gpu/drm/drm_format_helper_test.c

    diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
    index e88c497fa010..d92be6faef15 100644
    --- a/drivers/gpu/drm/Kconfig
    +++ b/drivers/gpu/drm/Kconfig
    @@ -76,6 +76,18 @@ config DRM_KMS_HELPER
    help
    CRTC helpers for KMS drivers.

    +config DRM_FORMAR_HELPER_TEST
    + bool "drm_format_helper tests" if !KUNIT_ALL_TESTS
    + depends on DRM && KUNIT=y
    + select DRM_KMS_HELPER
    + default KUNIT_ALL_TESTS
    + help
    + KUnit tests for the drm_format_helper APIs. This option is not
    + useful for distributions or general kernels, but only for kernel
    + developers working on DRM and associated drivers.
    +
    + If in doubt, say "N".
    +
    config DRM_DEBUG_DP_MST_TOPOLOGY_REFS
    bool "Enable refcount backtrace history in the DP MST helpers"
    depends on STACKTRACE_SUPPORT
    diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
    index 15fe3163f822..6a7d7655d38c 100644
    --- a/drivers/gpu/drm/Makefile
    +++ b/drivers/gpu/drm/Makefile
    @@ -76,6 +76,9 @@ obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o
    #

    obj-$(CONFIG_DRM_DEBUG_SELFTEST) += selftests/
    +obj-$(CONFIG_DRM_FORMAR_HELPER_TEST) += drm_kms_helper.o \
    + drm_format_helper_test.o
    +CFLAGS_drm_format_helper_test.o += $(DISABLE_STRUCTLEAK_PLUGIN)

    obj-$(CONFIG_DRM_MIPI_DBI) += drm_mipi_dbi.o
    obj-$(CONFIG_DRM_MIPI_DSI) += drm_mipi_dsi.o
    diff --git a/drivers/gpu/drm/drm_format_helper_test.c b/drivers/gpu/drm/drm_format_helper_test.c
    new file mode 100644
    index 000000000000..9c8a3007346c
    --- /dev/null
    +++ b/drivers/gpu/drm/drm_format_helper_test.c
    @@ -0,0 +1,166 @@
    +// 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
    +#define CLIP(x, y, w, h) { (x), (y), (x) + (w), (y) + (h) }
    +
    +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",
    + .pitch = 1 * 4,
    + .dst_pitch = 0,
    + .clip = CLIP(0, 0, 1, 1),
    + .xrgb8888 = { 0x01FF0000 },
    + .expected = { 0xE0 },
    + },
    + {
    + .name = "Single pixel clip",
    + .pitch = 2 * 4,
    + .dst_pitch = 0,
    + .clip = CLIP(1, 1, 1, 1),
    + .xrgb8888 = {
    + 0x00000000, 0x00000000,
    + 0x00000000, 0x10FF0000,
    + },
    + .expected = { 0xE0 },
    + },
    + {
    + .name = "White, black, red, green, blue, magenta, yellow, cyan",
    + .pitch = 4 * 4,
    + .dst_pitch = 0,
    + .clip = CLIP(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,
    + },
    + },
    + {
    + .name = "Destination pitch",
    + .pitch = 3 * 4,
    + .dst_pitch = 5,
    + .clip = CLIP(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, &params->clip);
    + KUNIT_ASSERT_GT(test, dst_size, 0);
    +
    + dst = kzalloc(dst_size, GFP_KERNEL);
    + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dst);
    +
    + drm_fb_xrgb8888_to_rgb332(dst, params->dst_pitch, params->xrgb8888,
    + &fb, &params->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>");
    --
    2.25.1
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