This patchset adds a way for DRM drivers to display kernel messages during panic(). I had a Windows blue screen last year and remembered this patchset, so I did a new version that I never got around to put out. Now that panic handling came up on the ML, I'm sending it out as part of the discussion. TODO: Determine which part of the framebuffer that is actually visible. I don't know enough about KMS to do this. See drm_panic_kmsg_render_screen(). Testing: I have tested[1] using the formats and resolutions support by vc4 and modetest. I have even recorded it[2]. RG24 and BG24 gave an unexpected result, not sure what to make of it. Noralf. [1] https://gist.github.com/notro/b9fdff4c6a68a307091e970598f27ed0 [2] https://youtu.be/lZ80vL4dgpE Version 1 (Aug 2016): https://patchwork.freedesktop.org/series/10867/ Changes since version 1: - Use kernel message dumper - Add multicolumn support - Support some YUV formats - cma: vmap PRIME buffers on import to support that case Noralf Trønnes (3): drm: Add support for panic message output drm/cma-helper: Add support for panic screen drm/vc4: Support for panic screen drivers/gpu/drm/Kconfig | 3 + drivers/gpu/drm/Makefile | 2 +- drivers/gpu/drm/drm_drv.c | 3 + drivers/gpu/drm/drm_fb_cma_helper.c | 43 ++++ drivers/gpu/drm/drm_framebuffer.c | 117 +++++++++ drivers/gpu/drm/drm_gem_cma_helper.c | 3 + drivers/gpu/drm/drm_internal.h | 4 + drivers/gpu/drm/drm_panic.c | 363 +++++++++++++++++++++++++++ drivers/gpu/drm/vc4/vc4_kms.c | 3 +- include/drm/drm_fb_cma_helper.h | 4 +- include/drm/drm_framebuffer.h | 41 +++ 11 files changed, 583 insertions(+), 3 deletions(-) create mode 100644 drivers/gpu/drm/drm_panic.c -- 2.20.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
