From cb5164ac43d0fc37ac6b45cabbc4d244068289ef Mon Sep 17 00:00:00 2001 From: Jocelyn Falempe Date: Thu, 22 Aug 2024 09:33:57 +0200 Subject: drm/panic: Add a QR code panic screen 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 --- drivers/gpu/drm/Kconfig | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'drivers/gpu/drm/Kconfig') diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 0387143bbb39..1cb5a4f19293 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -149,6 +149,37 @@ config DRM_PANIC_SCREEN or by writing to /sys/module/drm/parameters/panic_screen sysfs entry Default is "user" +config DRM_PANIC_SCREEN_QR_CODE + bool "Add a panic screen with a QR code" + depends on DRM_PANIC && RUST + help + This option adds a QR code generator, and a panic screen with a QR + code. The QR code will contain the last lines of kmsg and other debug + information. This should be easier for the user to report a kernel + panic, with all debug information available. + To use this panic screen, also set DRM_PANIC_SCREEN to "qr_code" + +config DRM_PANIC_SCREEN_QR_CODE_URL + string "Base URL of the QR code in the panic screen" + depends on DRM_PANIC_SCREEN_QR_CODE + help + This option sets the base URL to report the kernel panic. If it's set + the QR code will contain the URL and the kmsg compressed with zlib as + a URL parameter. If it's empty, the QR code will contain the kmsg as + uncompressed text only. + There is a demo code in javascript, to decode and uncompress the kmsg + data from the URL parameter at https://github.com/kdj0c/panic_report + +config DRM_PANIC_SCREEN_QR_VERSION + int "Maximum version (size) of the QR code." + depends on DRM_PANIC_SCREEN_QR_CODE + default 40 + help + This option limits the version (or size) of the QR code. QR code + version ranges from Version 1 (21x21) to Version 40 (177x177). + Smaller QR code are easier to read, but will contain less debugging + data. Default is 40. + config DRM_DEBUG_DP_MST_TOPOLOGY_REFS bool "Enable refcount backtrace history in the DP MST helpers" depends on STACKTRACE_SUPPORT -- cgit v1.2.3