TTM provides global memory and a global BO that is shared by all
TTM-based drivers. The data structures are provided by struct drm_global
and its helpers. All TTM-based DRM drivers copy the initialization and
clean-up code for the global TTM state from each other; leading to code
duplication.
The new structure struct ttm_global and its helpers provide a unified
implementation. Drivers only have to initialize it and forward the
contained BO global object to ttm_bo_device_init().
The amdgpu and radeon drivers are converted to struct ttm_global as
part of this patch set. All other TTM-based drivers share exactly the
same code patterns and can be converted in the same way.
Future directions: I already have patches for converting the remaining
TTM drivers to struct ttm_global. These patches can be merged after
the structure has become available in upstream. struct ttm_global is
implemented on top of struct drm_global. The latter actually maintains
TTM state instead of DRM state. Once all drivers have been converted,
the code for struct drm_global can be merged into struct ttm_global.
(Resending this patch set, as I forgot to CC the mailing lists as first.)
Thomas Zimmermann (3):
drm/ttm: Provide struct ttm_global for referencing TTM global state
drm/amdgpu: Replace TTM initialization/release with ttm_global
drm/radeon: Replace TTM initialization/release with ttm_global
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 63 ++--------------
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 4 +-
drivers/gpu/drm/radeon/radeon.h | 4 +-
drivers/gpu/drm/radeon/radeon_ttm.c | 40 ++--------
drivers/gpu/drm/ttm/Makefile | 2 +-
drivers/gpu/drm/ttm/ttm_global.c | 98 +++++++++++++++++++++++++
include/drm/drm_global.h | 8 ++
include/drm/ttm/ttm_global.h | 79 ++++++++++++++++++++
8 files changed, 200 insertions(+), 98 deletions(-)
create mode 100644 drivers/gpu/drm/ttm/ttm_global.c
create mode 100644 include/drm/ttm/ttm_global.h
--
2.19.1
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