This patchset adds a library for shmem backed GEM objects. I'm putting out an rfc to find out if I'm on the right track with this. The shmem library is very similar to the cma library, so I have tried to pull out the common bits.
A couple of questions: - What should the default cache mode be? - Do I need locking around vmap/vunmap? See TODO in [RFC 5/7] drm: Add library for shmem backed GEM objects
Noralf.
Noralf Trønnes (7): drm/gem: Add drm_gem_dumb_map_offset() drm: Add GEM backed framebuffer library drm/fb-helper: Support shadow buffer with deferred io drm/fb-helper: Add simple init/fini functions drm: Add library for shmem backed GEM objects drm: Add kms library for shmem backed GEM drm/tinydrm: Switch from CMA to shmem buffers
drivers/gpu/drm/Kconfig | 17 + drivers/gpu/drm/Makefile | 4 +- drivers/gpu/drm/drm_fb_gem_helper.c | 248 +++++++++++ drivers/gpu/drm/drm_fb_helper.c | 229 +++++++++- drivers/gpu/drm/drm_fb_shmem_helper.c | 168 ++++++++ drivers/gpu/drm/drm_gem.c | 35 ++ drivers/gpu/drm/drm_gem_shmem_helper.c | 628 ++++++++++++++++++++++++++++ drivers/gpu/drm/tinydrm/Kconfig | 2 +- drivers/gpu/drm/tinydrm/core/tinydrm-core.c | 147 +++---- drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 4 +- drivers/gpu/drm/tinydrm/mi0283qt.c | 2 +- drivers/gpu/drm/tinydrm/mipi-dbi.c | 41 +- include/drm/drm_fb_gem_helper.h | 64 +++ include/drm/drm_fb_helper.h | 50 +++ include/drm/drm_fb_shmem_helper.h | 18 + include/drm/drm_gem.h | 2 + include/drm/drm_gem_shmem_helper.h | 131 ++++++ include/drm/tinydrm/tinydrm.h | 32 +- 18 files changed, 1683 insertions(+), 139 deletions(-) create mode 100644 drivers/gpu/drm/drm_fb_gem_helper.c create mode 100644 drivers/gpu/drm/drm_fb_shmem_helper.c create mode 100644 drivers/gpu/drm/drm_gem_shmem_helper.c create mode 100644 include/drm/drm_fb_gem_helper.h create mode 100644 include/drm/drm_fb_shmem_helper.h create mode 100644 include/drm/drm_gem_shmem_helper.h
-- 2.7.4