Add kunit tests for drm_panic. They check that drawing the panic screen doesn't crash, but they don't check the correctness of the resulting image.
Signed-off-by: Jocelyn Falempe <jfale...@redhat.com> --- MAINTAINERS | 1 + drivers/gpu/drm/drm_panic.c | 4 + drivers/gpu/drm/tests/drm_panic_test.c | 164 +++++++++++++++++++++++++ 3 files changed, 169 insertions(+) create mode 100644 drivers/gpu/drm/tests/drm_panic_test.c diff --git a/MAINTAINERS b/MAINTAINERS index cfa28b3470ab..285d1e27734f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8465,6 +8465,7 @@ T: git https://gitlab.freedesktop.org/drm/misc/kernel.git F: drivers/gpu/drm/drm_draw.c F: drivers/gpu/drm/drm_draw_internal.h F: drivers/gpu/drm/drm_panic*.c +F: drivers/gpu/drm/tests/drm_panic_test.c F: include/drm/drm_panic* DRM PANIC QR CODE diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c index 1e06e3a18d09..d89812ff1935 100644 --- a/drivers/gpu/drm/drm_panic.c +++ b/drivers/gpu/drm/drm_panic.c @@ -986,3 +986,7 @@ void drm_panic_exit(void) { drm_panic_qr_exit(); } + +#ifdef CONFIG_DRM_KUNIT_TEST +#include "tests/drm_panic_test.c" +#endif diff --git a/drivers/gpu/drm/tests/drm_panic_test.c b/drivers/gpu/drm/tests/drm_panic_test.c new file mode 100644 index 000000000000..46ff3e5e0e5d --- /dev/null +++ b/drivers/gpu/drm/tests/drm_panic_test.c @@ -0,0 +1,164 @@ +// SPDX-License-Identifier: GPL-2.0 or MIT +/* + * Copyright (c) 2025 Red Hat. + * Author: Jocelyn Falempe <jfale...@redhat.com> + * + * KUNIT tests for drm panic + */ + +#include <drm/drm_fourcc.h> +#include <drm/drm_panic.h> + +#include <kunit/test.h> + +#include <linux/units.h> +#include <linux/vmalloc.h> + +struct drm_test_mode { + const int width; + const int height; + const u32 format; + void (*draw_screen)(struct drm_scanout_buffer *sb); + const char *fname; +}; + +/* + * Run all tests for the 3 panic screens: user, kmsg and qr_code + */ +#define DRM_TEST_MODE_LIST(func) \ + DRM_PANIC_TEST_MODE(1024, 768, DRM_FORMAT_XRGB8888, func) \ + DRM_PANIC_TEST_MODE(300, 200, DRM_FORMAT_XRGB8888, func) \ + DRM_PANIC_TEST_MODE(1920, 1080, DRM_FORMAT_XRGB8888, func) \ + DRM_PANIC_TEST_MODE(1024, 768, DRM_FORMAT_RGB565, func) \ + DRM_PANIC_TEST_MODE(1024, 768, DRM_FORMAT_RGB888, func) \ + +#define DRM_PANIC_TEST_MODE(w, h, f, name) { \ + .width = w, \ + .height = h, \ + .format = f, \ + .draw_screen = draw_panic_screen_##name, \ + .fname = #name, \ + }, \ + +static const struct drm_test_mode drm_test_modes_cases[] = { + DRM_TEST_MODE_LIST(user) + DRM_TEST_MODE_LIST(kmsg) + DRM_TEST_MODE_LIST(qr_code) +}; +#undef DRM_PANIC_TEST_MODE + +static int drm_test_panic_init(struct kunit *test) +{ + struct drm_scanout_buffer *priv; + + priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, priv); + + test->priv = priv; + + drm_panic_set_description("Kunit testing"); + + return 0; +} + +static void drm_test_panic_screen_user_map(struct kunit *test) +{ + struct drm_scanout_buffer *sb = test->priv; + const struct drm_test_mode *params = test->param_value; + void *fb; + int fb_size; + + sb->format = drm_format_info(params->format); + fb_size = params->width * params->height * sb->format->cpp[0]; + + fb = vmalloc(fb_size); + KUNIT_ASSERT_NOT_NULL(test, fb); + + iosys_map_set_vaddr(&sb->map[0], fb); + sb->width = params->width; + sb->height = params->height; + sb->pitch[0] = params->width * sb->format->cpp[0]; + + params->draw_screen(sb); + vfree(fb); +} + +static void drm_test_panic_screen_user_page(struct kunit *test) +{ + struct drm_scanout_buffer *sb = test->priv; + const struct drm_test_mode *params = test->param_value; + int fb_size; + struct page **pages; + int i; + int npages; + + sb->format = drm_format_info(params->format); + fb_size = params->width * params->height * sb->format->cpp[0]; + npages = DIV_ROUND_UP(fb_size, PAGE_SIZE); + + pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, pages); + + for (i = 0; i < npages; i++) { + pages[i] = alloc_page(GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, pages[i]); + } + sb->pages = pages; + sb->width = params->width; + sb->height = params->height; + sb->pitch[0] = params->width * sb->format->cpp[0]; + + params->draw_screen(sb); + + for (i = 0; i < npages; i++) + __free_page(pages[i]); + kfree(pages); +} + +static void drm_test_panic_set_pixel(struct drm_scanout_buffer *sb, + unsigned int x, + unsigned int y, + u32 color) +{ +} + +static void drm_test_panic_screen_user_set_pixel(struct kunit *test) +{ + struct drm_scanout_buffer *sb = test->priv; + const struct drm_test_mode *params = test->param_value; + + sb->format = drm_format_info(params->format); + sb->set_pixel = drm_test_panic_set_pixel; + sb->width = params->width; + sb->height = params->height; + + params->draw_screen(sb); +} + +static void drm_test_panic_desc(const struct drm_test_mode *t, char *desc) +{ + sprintf(desc, "Panic screen %s, mode: %d x %d \t%p4cc", + t->fname, t->width, t->height, &t->format); +} + +KUNIT_ARRAY_PARAM(drm_test_panic_screen_user_map, drm_test_modes_cases, drm_test_panic_desc); +KUNIT_ARRAY_PARAM(drm_test_panic_screen_user_page, drm_test_modes_cases, drm_test_panic_desc); +KUNIT_ARRAY_PARAM(drm_test_panic_screen_user_set_pixel, drm_test_modes_cases, drm_test_panic_desc); + +static struct kunit_case drm_panic_screen_user_test[] = { + KUNIT_CASE_PARAM(drm_test_panic_screen_user_map, + drm_test_panic_screen_user_map_gen_params), + KUNIT_CASE_PARAM(drm_test_panic_screen_user_page, + drm_test_panic_screen_user_page_gen_params), + KUNIT_CASE_PARAM(drm_test_panic_screen_user_set_pixel, + drm_test_panic_screen_user_set_pixel_gen_params), + { } +}; + +static struct kunit_suite drm_panic_suite = { + .name = "drm_panic", + .init = drm_test_panic_init, + .test_cases = drm_panic_screen_user_test, +}; + +kunit_test_suite(drm_panic_suite); -- 2.50.1
