Several SHMEM-based drivers use the BO as shadow buffer for the real framebuffer memory. Damage handling requires a vmap of the BO memory. But vmap/vunmap can acquire the dma-buf reservation lock, which is not allowed in commit tails. This patchset introduces a set of helpers that implement vmap/vunmap in the plane's prepare_fb and cleanup_fb; and provide the mapping's address to commit-tail functions. Wrappers for simple KMS are provides, as all of the involved drivers are built upon simple-KMS helpers. All patches have been acked already. v3 only fixes a few typos in the documentation. Patch 1 adds the support for private plane state to the simple-KMS helper library. Patches 2 and 3 provide plane state for shadow-buffered planes. It's a DRM plane with BO mappings into kernel address space. The involved helpers take care of the details. The code is independent from GEM SHMEM and can be used with other shadow-buffered planes. I put all this in a new file. In a later patch, drm_gem_fb_prepare_fb() et al could be moved there as well. Patches 4 to 7 convert each involved driver to the new helpers. The vmap operations are being removed from commit-tail functions. An additional benefit is that vmap errors are now detected before the commit starts. The original commit-tail functions could not handle failed vmap operations. I smoke-tested the code by running fbdev, Xorg and weston with the converted mgag200 driver. v3: * documentation fixes v2: * export drm_gem_vmap()/_vunmap() (kernel test robot) * make duplicate_state interface compatible with struct drm_plane_funcs Thomas Zimmermann (7): drm/simple-kms: Add plane-state helpers drm/gem: Export drm_gem_vmap() and drm_gem_vunmap() drm: Add additional atomic helpers for shadow-buffered planes drm/mgag200: Move vmap out of commit tail drm/cirrus: Move vmap out of commit tail drm/gm12u320: Move vmap out of commit tail drm/udl: Move vmap out of commit tail Documentation/gpu/drm-kms-helpers.rst | 12 ++ drivers/gpu/drm/Makefile | 3 +- drivers/gpu/drm/drm_gem.c | 2 + drivers/gpu/drm/drm_gem_atomic_helper.c | 208 ++++++++++++++++++++++++ drivers/gpu/drm/drm_simple_kms_helper.c | 40 ++++- drivers/gpu/drm/mgag200/mgag200_mode.c | 23 +-- drivers/gpu/drm/tiny/cirrus.c | 43 ++--- drivers/gpu/drm/tiny/gm12u320.c | 28 ++-- drivers/gpu/drm/udl/udl_modeset.c | 34 ++-- include/drm/drm_gem_atomic_helper.h | 73 +++++++++ include/drm/drm_simple_kms_helper.h | 27 +++ 11 files changed, 412 insertions(+), 81 deletions(-) create mode 100644 drivers/gpu/drm/drm_gem_atomic_helper.c create mode 100644 include/drm/drm_gem_atomic_helper.h base-commit: efb1b1293b064512f7c47537e35ad14a05a05c84 prerequisite-patch-id: c2b2f08f0eccc9f5df0c0da49fa1d36267deb11d -- 2.30.0 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
