kernel/linux.git/drivers/gpu/drm/drm_panic.c, branch v6.12.80

drm/panic: Fix qr_code, ensure vmargin is positive

2025-10-29T13:08:59+00:00

[ Upstream commit 4fcffb5e5c8c0c8e2ad9c99a22305a0afbecc294 ] Depending on qr_code size and screen size, the vertical margin can be negative, that means there is not enough room to draw the qr_code. So abort early, to avoid a segfault by trying to draw at negative coordinates. Fixes: cb5164ac43d0f ("drm/panic: Add a QR code panic screen") Reviewed-by: Javier Martinez Canillas Link: https://lore.kernel.org/r/20251009122955.562888-4-jfalempe@redhat.com Signed-off-by: Jocelyn Falempe Signed-off-by: Sasha Levin

drm/panic: Fix drawing the logo on a small narrow screen

2025-10-29T13:08:59+00:00

[ Upstream commit 179753aa5b7890b311968c033d08f558f0a7be21 ] If the logo width is bigger than the framebuffer width, and the height is big enough to hold the logo and the message, it will draw at x coordinate that are higher than the width, and ends up in a corrupted image. Fixes: 4b570ac2eb54 ("drm/rect: Add drm_rect_overlap()") Reviewed-by: Javier Martinez Canillas Link: https://lore.kernel.org/r/20251009122955.562888-2-jfalempe@redhat.com Signed-off-by: Jocelyn Falempe Signed-off-by: Sasha Levin

drm/panic: Move drawing functions to drm_draw

2025-08-28T14:31:11+00:00

[ Upstream commit 31fa2c1ca0b239f64eaf682f1685bbbd74fc0181 ] Move the color conversions, blit and fill functions to drm_draw.c, so that they can be re-used by drm_log. drm_draw is internal to the drm subsystem, and shouldn't be used by gpu drivers. Signed-off-by: Jocelyn Falempe Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20241204160014.1171469-2-jfalempe@redhat.com Stable-dep-of: 05663d88fd0b ("drm/tests: Fix drm_test_fb_xrgb8888_to_xrgb2101010() on big-endian") Signed-off-by: Sasha Levin

drm/panic: Add ABGR2101010 support

2024-12-14T19:03:53+00:00

[ Upstream commit 04596969eea9e73b64d63be52aabfddb382e9ce6 ] Add support for ABGR2101010, used by the nouveau driver. Signed-off-by: Jocelyn Falempe Reviewed-by: Javier Martinez Canillas Link: https://patchwork.freedesktop.org/patch/msgid/20241022185553.1103384-2-jfalempe@redhat.com Signed-off-by: Sasha Levin

drm/panic: Add a QR code panic screen

2024-08-23T14:55:35+00:00

This patch adds a new panic screen, with a QR code and the kmsg data embedded. If DRM_PANIC_SCREEN_QR_CODE_URL is set, then the kmsg data will be compressed with zlib and encoded as a numerical segment, and appended to the URL as a URL parameter. This allows to save space, and put about ~7500 bytes of kmsg data, in a V40 QR code. Linux distributions can customize the URL, and put a web frontend to directly open a bug report with the kmsg data. Otherwise the kmsg data will be encoded as a binary segment (ie raw ascii) and only a maximum of 2953 bytes of kmsg data will be available in the QR code. You can also limit the QR code size with DRM_PANIC_SCREEN_QR_VERSION. Signed-off-by: Jocelyn Falempe Reviewed-by: Alice Ryhl Link: https://patchwork.freedesktop.org/patch/msgid/20240822073852.562286-5-jfalempe@redhat.com

drm/panic: Simplify logo handling

2024-08-23T14:53:08+00:00

Move logo rectangle initialisation, and logo drawing in separate functions, so they can be re-used by different panic screens. It prepares the introduction of the QR code panic screen. Signed-off-by: Jocelyn Falempe Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20240822073852.562286-4-jfalempe@redhat.com

drm/rect: Add drm_rect_overlap()

2024-08-23T14:47:56+00:00

Check if two rectangles overlap. It's a bit similar to drm_rect_intersect() but this won't modify the rectangle. Simplifies a bit drm_panic. Signed-off-by: Jocelyn Falempe Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20240822073852.562286-3-jfalempe@redhat.com

drm/panic: Add integer scaling to blit()

2024-08-23T14:47:55+00:00

Add a parameter to the blit function, to upscale the image. This is necessary to draw a QR code, otherwise, the pixels are usually too small to be readable by most QR code reader. It can also be used later for drawing fonts on high DPI display. Signed-off-by: Jocelyn Falempe Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20240822073852.562286-2-jfalempe@redhat.com

drm/panic: Add panic description

2024-08-12T08:15:45+00:00

Now that kmsg dump callback has the description parameter, use it in the user panic screen. This is the string passed to panic(), like "VFS: Unable to mount root fs on xxx" or "Attempted to kill init! exitcode=0xxxx". It gives a hint on why the panic occurred, without being too cryptic. Signed-off-by: Jocelyn Falempe Reviewed-by: Thomas Zimmermann Reviewed-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20240807134902.458669-6-jfalempe@redhat.com

drm/panic: Remove useless export symbols

2024-08-12T08:14:09+00:00

drm_panic_[un]register() are called only from the core drm, so there is no need to export them. Suggested-by: Daniel Vetter Signed-off-by: Jocelyn Falempe Reviewed-by: Daniel Vetter Reviewed-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20240807134902.458669-3-jfalempe@redhat.com