This series adds a new panic screen, with the kmsg data embedded in a QR code. The main advantage of QR code, is that you can copy/paste the debug data to a bug report. The QR code encoder is written in rust, and is very specific to drm panic. The reason is that it is called in a panic handler, and thus can't allocate memory, or use locking. The rust code uses a few rust core API, and provides only two C entry points. There is no particular reason to do it in rust, I just wanted to learn rust, and see if it can work in the kernel. If you want to see what it looks like, I've put a few screenshots here: https://github.com/kdj0c/panic_report/issues/1 v2: * Rewrite the rust comments with Markdown (Alice Ryhl) * Mark drm_panic_qr_generate() as unsafe (Alice Ryhl) * Use CStr directly, and remove the call to as_str_unchecked() (Alice Ryhl) * Add a check for data_len <= data_size (Greg KH) v3: * Fix all rust comments (typo, punctuation) (Miguel Ojeda) * Change the wording of safety comments (Alice Ryhl) * Add a link to the javascript decoder in the Kconfig (Greg KH) * Fix data_size and tmp_size check in drm_panic_qr_generate() v4: * Fix the logic to find next line and skip the '\n' (Alic Ryhl) * Remove __LOG_PREFIX as it's not used (Alice Ryhl) v5: * Move drm_panic_[init|exit]() prototype to drm_crtc_internal.h (Daniel Vetter) v6: * rebase, and handle conflict with 5d45c01dea6f ("drm/panic: Add panic description") * Fix qr_width should be a signed int, to handle error code. Jocelyn Falempe (4): drm/panic: Add integer scaling to blit() drm/rect: Add drm_rect_overlap() drm/panic: Simplify logo handling drm/panic: Add a QR code panic screen drivers/gpu/drm/Kconfig | 31 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/drm_crtc_internal.h | 4 + drivers/gpu/drm/drm_drv.c | 3 + drivers/gpu/drm/drm_panic.c | 340 +++++++-- drivers/gpu/drm/drm_panic_qr.rs | 1003 +++++++++++++++++++++++++++ include/drm/drm_rect.h | 15 + 7 files changed, 1357 insertions(+), 40 deletions(-) create mode 100644 drivers/gpu/drm/drm_panic_qr.rs base-commit: 5d45c01dea6f9e0f2dbed3ffee02ac2e80579ad4 -- 2.46.0
