Hi This patch series proposes enhancement for drm_panic. While virtio-gpu currently supports drm_panic [1], it is limited to vmapped shmem BOs. IOW, it does not work in non-VT FB environments, such as GUI desktops. This limitation arises because shmem BOs require vmap, which cannot be used in a panic handler since vmap is sleepable and takes locks. To address this, drm_panic needs an atomic variant of vmap. The first patch (1/2) introduces atomic_vmap, and the second patch (2/2) updates the existing virtio drm_panic implementation to use the atomic_vmap. I've tested these changes in both Gnome and VT environments, and they work correctly. Best regards, Ryosuke [1] https://patchwork.freedesktop.org/patch/635658/ Ryosuke Yasuoka (2): vmalloc: Add atomic_vmap drm/virtio: Use atomic_vmap to work drm_panic in GUI drivers/gpu/drm/drm_gem.c | 51 ++++++++++++ drivers/gpu/drm/drm_gem_shmem_helper.c | 51 ++++++++++++ drivers/gpu/drm/virtio/virtgpu_plane.c | 14 +++- include/drm/drm_gem.h | 1 + include/drm/drm_gem_shmem_helper.h | 2 + include/linux/vmalloc.h | 2 + mm/internal.h | 5 ++ mm/vmalloc.c | 105 +++++++++++++++++++++++++ 8 files changed, 228 insertions(+), 3 deletions(-) base-commit: e21cba704714c301d04c5fd37a693734b623872a -- 2.48.1
