From nobody Wed Dec 17 10:56:23 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25FDC327207 for ; Tue, 16 Dec 2025 08:25:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765873556; cv=none; b=IHzC991WLYA9Bl0Te4B+SZjfS0YpDOGJFxd5bjvhpYw1xMrxBhtwzvl2LZvivTqahryvvGdqoVi5+kmjXIzjl2L2JQ9zV5wuoz4w6ZAgYaReH3VhoVBJxtug2VDuRK0x27hoqtTrkQjiKEIVOiKPmj2zJ5cckPmsC+/pi3WLhhk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765873556; c=relaxed/simple; bh=5Dl5hNXi2ABTDA4h1upVqdOUPVNs/2K2JYxczm3DJTI=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZdLcBUAOl2YsC16B5MEdzP0kFxqGry7mMAPtfKs+epbOtVjjHGXS+/djxS2dv+jFzv91KPZiz21zwmgzfgXt2sfDA4MpYU+JmW4SBD4xWI6ByMSvp0CuyxWKX4qQDWN79xK1Coc87jUv0V5iyBmsAK0yteLLSypSAYmoAYD7BgY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=SlORRaS0; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SlORRaS0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1765873553; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LxZuDficpsxht2y5/1g+Ss0ZtX3L7w3OqfgkU4mgrZA=; b=SlORRaS0MAslzy1JqNjIzjV2UAKIAaCQDtnaK2QHn05cY/ePFjy+vruvG3v2fj7HAXLK1V dmnNjMRv271vmPVJCVYIjA0u3idsV1lr+A2mi5I4+WcXVyUx8M8czbjZZMO7Jnnr5nvvLx PWOtlAkqYj4CiSWIFZ5XIR4Xzn9vRg4= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-530-2U7Lqs-IP_eBPMFE3pjlSQ-1; Tue, 16 Dec 2025 03:25:48 -0500 X-MC-Unique: 2U7Lqs-IP_eBPMFE3pjlSQ-1 X-Mimecast-MFC-AGG-ID: 2U7Lqs-IP_eBPMFE3pjlSQ_1765873547 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id C9F6F195608E; Tue, 16 Dec 2025 08:25:46 +0000 (UTC) Received: from hydra.redhat.com (unknown [10.45.224.146]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 590AB18004D8; Tue, 16 Dec 2025 08:25:43 +0000 (UTC) From: Jocelyn Falempe To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jocelyn Falempe , Javier Martinez Canillas , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH v4 1/2] drm/panic: Rename draw_panic_static_* to draw_panic_screen_* Date: Tue, 16 Dec 2025 09:20:38 +0100 Message-ID: <20251216082524.115980-2-jfalempe@redhat.com> In-Reply-To: <20251216082524.115980-1-jfalempe@redhat.com> References: <20251216082524.115980-1-jfalempe@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Content-Type: text/plain; charset="utf-8" I called them "static" because the panic screen is drawn only once, but this can be confused with the static meaning in C. Also remove some unnecessary braces in draw_panic_dispatch(). No functionnal change. Signed-off-by: Jocelyn Falempe Reviewed-by: Javier Martinez Canillas --- drivers/gpu/drm/drm_panic.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c index f42be7f1d8c2..30c615768efe 100644 --- a/drivers/gpu/drm/drm_panic.c +++ b/drivers/gpu/drm/drm_panic.c @@ -476,7 +476,7 @@ static void drm_panic_logo_draw(struct drm_scanout_buff= er *sb, struct drm_rect * fg_color); } =20 -static void draw_panic_static_user(struct drm_scanout_buffer *sb) +static void draw_panic_screen_user(struct drm_scanout_buffer *sb) { u32 fg_color =3D drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_FOREGROUND= _COLOR, sb->format->format); @@ -545,7 +545,7 @@ static int draw_line_with_wrap(struct drm_scanout_buffe= r *sb, const struct font_ * Draw the kmsg buffer to the screen, starting from the youngest message = at the bottom, * and going up until reaching the top of the screen. */ -static void draw_panic_static_kmsg(struct drm_scanout_buffer *sb) +static void draw_panic_screen_kmsg(struct drm_scanout_buffer *sb) { u32 fg_color =3D drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_FOREGROUND= _COLOR, sb->format->format); @@ -733,7 +733,7 @@ static int drm_panic_get_qr_code(u8 **qr_image) /* * Draw the panic message at the center of the screen, with a QR Code */ -static int _draw_panic_static_qr_code(struct drm_scanout_buffer *sb) +static int _draw_panic_screen_qr_code(struct drm_scanout_buffer *sb) { u32 fg_color =3D drm_draw_color_from_xrgb8888(CONFIG_DRM_PANIC_FOREGROUND= _COLOR, sb->format->format); @@ -801,10 +801,10 @@ static int _draw_panic_static_qr_code(struct drm_scan= out_buffer *sb) return 0; } =20 -static void draw_panic_static_qr_code(struct drm_scanout_buffer *sb) +static void draw_panic_screen_qr_code(struct drm_scanout_buffer *sb) { - if (_draw_panic_static_qr_code(sb)) - draw_panic_static_user(sb); + if (_draw_panic_screen_qr_code(sb)) + draw_panic_screen_user(sb); } #else static void drm_panic_qr_init(void) {}; @@ -879,18 +879,18 @@ static void draw_panic_dispatch(struct drm_scanout_bu= ffer *sb) { switch (drm_panic_type) { case DRM_PANIC_TYPE_KMSG: - draw_panic_static_kmsg(sb); + draw_panic_screen_kmsg(sb); 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Tue, 16 Dec 2025 08:25:50 +0000 (UTC) Received: from hydra.redhat.com (unknown [10.45.224.146]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 59DB218004D8; Tue, 16 Dec 2025 08:25:47 +0000 (UTC) From: Jocelyn Falempe To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jocelyn Falempe , Javier Martinez Canillas , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH v4 2/2] drm/panic: Add kunit tests for drm_panic Date: Tue, 16 Dec 2025 09:20:39 +0100 Message-ID: <20251216082524.115980-3-jfalempe@redhat.com> In-Reply-To: <20251216082524.115980-1-jfalempe@redhat.com> References: <20251216082524.115980-1-jfalempe@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Content-Type: text/plain; charset="utf-8" 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 --- v3: * Check the framebuffer content in drm_test_panic_screen_user_page(). * Fix memory leaks, when the test fails (Maxime Ripard). v4: * Run QR code test only if QR code panic screen is built. MAINTAINERS | 1 + drivers/gpu/drm/drm_panic.c | 4 + drivers/gpu/drm/tests/drm_panic_test.c | 220 +++++++++++++++++++++++++ 3 files changed, 225 insertions(+) create mode 100644 drivers/gpu/drm/tests/drm_panic_test.c diff --git a/MAINTAINERS b/MAINTAINERS index f980623f1479..74eb8c7da2ab 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8749,6 +8749,7 @@ 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* =20 DRM PANIC QR CODE diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c index 30c615768efe..a9f54c51a522 100644 --- a/drivers/gpu/drm/drm_panic.c +++ b/drivers/gpu/drm/drm_panic.c @@ -1084,3 +1084,7 @@ 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..dfd79b12ae9b --- /dev/null +++ b/drivers/gpu/drm/tests/drm_panic_test.c @@ -0,0 +1,220 @@ +// SPDX-License-Identifier: GPL-2.0 or MIT +/* + * Copyright (c) 2025 Red Hat. + * Author: Jocelyn Falempe + * + * KUNIT tests for drm panic + */ + +#include +#include + +#include + +#include +#include + +/* Check the framebuffer color only if the panic colors are the default */ +#if (CONFIG_DRM_PANIC_BACKGROUND_COLOR =3D=3D 0 && \ + CONFIG_DRM_PANIC_FOREGROUND_COLOR =3D=3D 0xffffff) + +static void drm_panic_check_color_byte(struct kunit *test, u8 b) +{ + KUNIT_EXPECT_TRUE(test, (b =3D=3D 0 || b =3D=3D 0xff)); +} +#else +static void drm_panic_check_color_byte(struct kunit *test, u8 b) {} +#endif + +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 =3D w, \ + .height =3D h, \ + .format =3D f, \ + .draw_screen =3D draw_panic_screen_##name, \ + .fname =3D #name, \ + }, \ + +static const struct drm_test_mode drm_test_modes_cases[] =3D { + DRM_TEST_MODE_LIST(user) + DRM_TEST_MODE_LIST(kmsg) +#if IS_ENABLED(CONFIG_DRM_PANIC_SCREEN_QR_CODE) + DRM_TEST_MODE_LIST(qr_code) +#endif +}; +#undef DRM_PANIC_TEST_MODE + +static int drm_test_panic_init(struct kunit *test) +{ + struct drm_scanout_buffer *priv; + + priv =3D kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, priv); + + test->priv =3D priv; + + drm_panic_set_description("Kunit testing"); + + return 0; +} + +/* + * Test drawing the panic screen, using a memory mapped framebuffer + * Set the whole buffer to 0xa5, and then check that all pixels have been + * written. + */ +static void drm_test_panic_screen_user_map(struct kunit *test) +{ + struct drm_scanout_buffer *sb =3D test->priv; + const struct drm_test_mode *params =3D test->param_value; + char *fb; + int fb_size; + int i; + + sb->format =3D drm_format_info(params->format); + fb_size =3D params->width * params->height * sb->format->cpp[0]; + + fb =3D vmalloc(fb_size); + KUNIT_ASSERT_NOT_NULL(test, fb); + + memset(fb, 0xa5, fb_size); + + iosys_map_set_vaddr(&sb->map[0], fb); + sb->width =3D params->width; + sb->height =3D params->height; + sb->pitch[0] =3D params->width * sb->format->cpp[0]; + + params->draw_screen(sb); + + for (i =3D 0; i < fb_size; i++) + drm_panic_check_color_byte(test, fb[i]); + + vfree(fb); +} + +/* + * Test drawing the panic screen, using a list of pages framebuffer + * Set the whole buffer to 0xa5, and then check that all pixels have been + * written. + */ +static void drm_test_panic_screen_user_page(struct kunit *test) +{ + struct drm_scanout_buffer *sb =3D test->priv; + const struct drm_test_mode *params =3D test->param_value; + int fb_size, p, i, npages; + struct page **pages; + u8 *vaddr; + + sb->format =3D drm_format_info(params->format); + fb_size =3D params->width * params->height * sb->format->cpp[0]; + npages =3D DIV_ROUND_UP(fb_size, PAGE_SIZE); + + pages =3D kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, pages); + + for (p =3D 0; p < npages; p++) { + pages[p] =3D alloc_page(GFP_KERNEL); + if (!pages[p]) { + npages =3D p - 1; + KUNIT_FAIL(test, "Can't allocate page\n"); + goto free_pages; + } + vaddr =3D kmap_local_page(pages[p]); + memset(vaddr, 0xa5, PAGE_SIZE); + kunmap_local(vaddr); + } + sb->pages =3D pages; + sb->width =3D params->width; + sb->height =3D params->height; + sb->pitch[0] =3D params->width * sb->format->cpp[0]; + + params->draw_screen(sb); + + for (p =3D 0; p < npages; p++) { + int bytes_in_page =3D (p =3D=3D npages - 1) ? fb_size - p * PAGE_SIZE : = PAGE_SIZE; + + vaddr =3D kmap_local_page(pages[p]); + for (i =3D 0; i < bytes_in_page; i++) + drm_panic_check_color_byte(test, vaddr[i]); + + kunmap_local(vaddr); + } + +free_pages: + for (p =3D 0; p < npages; p++) + __free_page(pages[p]); + kfree(pages); +} + +static void drm_test_panic_set_pixel(struct drm_scanout_buffer *sb, + unsigned int x, + unsigned int y, + u32 color) +{ + struct kunit *test =3D (struct kunit *) sb->private; + + KUNIT_ASSERT_TRUE(test, x < sb->width && y < sb->height); +} + +/* + * Test drawing the panic screen, using the set_pixel callback + * Check that all calls to set_pixel() are within the framebuffer + */ +static void drm_test_panic_screen_user_set_pixel(struct kunit *test) +{ + struct drm_scanout_buffer *sb =3D test->priv; + const struct drm_test_mode *params =3D test->param_value; + + sb->format =3D drm_format_info(params->format); + sb->set_pixel =3D drm_test_panic_set_pixel; + sb->width =3D params->width; + sb->height =3D params->height; + sb->private =3D test; + + 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, dr= m_test_panic_desc); +KUNIT_ARRAY_PARAM(drm_test_panic_screen_user_page, drm_test_modes_cases, d= rm_test_panic_desc); +KUNIT_ARRAY_PARAM(drm_test_panic_screen_user_set_pixel, drm_test_modes_cas= es, drm_test_panic_desc); + +static struct kunit_case drm_panic_screen_user_test[] =3D { + 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 =3D { + .name =3D "drm_panic", + .init =3D drm_test_panic_init, + .test_cases =3D drm_panic_screen_user_test, +}; + +kunit_test_suite(drm_panic_suite); --=20 2.52.0