On 19/07/2024 20:50, Mitchell Levy wrote:
I am trying to test this patchset on my setup, but I cannot get it
working. In case it's relevant, I'm running under HyperV. Any
troubleshooting steps/suggestions would definitely be appreciated.
First, make sure you have this in your .config:
CONFIG_RUST=y
CONFIG_DRM_SIMPLEDRM=y
CONFIG_SYSFB_SIMPLEFB=y
CONFIG_DRM_PANIC=y
CONFIG_DRM_PANIC_FOREGROUND_COLOR=0xffffff
CONFIG_DRM_PANIC_BACKGROUND_COLOR=0x000000
CONFIG_DRM_PANIC_DEBUG=y
CONFIG_DRM_PANIC_SCREEN="qr_code"
CONFIG_DRM_PANIC_SCREEN_QR_CODE=y
drm_panic is only supported by a few drivers. The easiest way to test,
is to use the simpledrm driver, that should work on all EFI or BIOS
based system.
To check the drm driver in use, run:
sudo udevadm info -a -n /dev/dri/card0 | grep DRIVER
If it's not simpledrm, you should blacklist it, and make sure you boot
with simpledrm.
and then you can run:
echo 1 > /sys/kernel/debug/dri/0/drm_panic_plane_0
On a side note, looking at the hyperv drm driver, it should be easy to
add drm_panic support for it. I will look into that when I get some time.
Best regards,
--
Jocelyn
Thanks!
Mitchell
On 7/17/2024 7:24 AM, Jocelyn Falempe wrote:
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' (Alice Ryhl)
* Remove __LOG_PREFIX as it's not used (Alice Ryhl)
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_drv.c | 3 +
drivers/gpu/drm/drm_panic.c | 340 +++++++++--
drivers/gpu/drm/drm_panic_qr.rs | 1003 +++++++++++++++++++++++++++++++
include/drm/drm_panic.h | 4 +
include/drm/drm_rect.h | 15 +
7 files changed, 1358 insertions(+), 39 deletions(-)
create mode 100644 drivers/gpu/drm/drm_panic_qr.rs
base-commit: e1a261ba599eec97e1c5c7760d5c3698fc24e6a6
