This is a first draft of drm_panic support for i915. I've tested it on the 3 intel laptops I have at my disposal. one Haswell with 128MB of eDRAM, one Cometlake and one Alderlake. I tested panic in both fbdev console and gnome desktop. I still have an issue with Alderlake, and it doesn't work when in gnome desktop. If I disable tiling on a framebuffer using DPT, then it displays some other memory location. As DPT is enabled only for tiled framebuffer, there might be some hardware limitations? I think it can be worked around by drawing the image tiled, (like what I've done on nouveau https://patchwork.freedesktop.org/series/133963/), but maybe there is another way? Best regards, Jocelyn Falempe (5): drm/i915/fbdev: Add intel_fbdev_getvaddr() drm/i915/display/i9xx: Add a disable_tiling() for i9xx planes drm/i915/display: Add a disable_tiling() for skl planes drm/i915/gem: export i915_gem_object_map_page/pfn drm/i915: Add drm_panic support drivers/gpu/drm/i915/display/i9xx_plane.c | 24 +++++ .../gpu/drm/i915/display/intel_atomic_plane.c | 98 ++++++++++++++++++- .../drm/i915/display/intel_display_types.h | 2 + drivers/gpu/drm/i915/display/intel_fbdev.c | 5 + drivers/gpu/drm/i915/display/intel_fbdev.h | 5 + .../drm/i915/display/skl_universal_plane.c | 20 ++++ drivers/gpu/drm/i915/gem/i915_gem_object.h | 5 + drivers/gpu/drm/i915/gem/i915_gem_pages.c | 4 +- 8 files changed, 160 insertions(+), 3 deletions(-) base-commit: 44cff6c5b0b17a78bc0b30372bcd816cf6dd282a -- 2.47.0
