On Mon, Mar 11, 2019 at 06:42:15PM +0100, Noralf Trønnes wrote: > 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(). drm_plane_state->src should have this, at least for all drivers using the clip helpers. Which I think is rolled out fairly well. If that happens to be all 0, then drm_plane_state->src_[xyhw] is a decent fallback. If the plane is occluded or scaled then I guess that's just bad luck. -Daniel > > 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 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
