[PATCH 0/2] Provide init/release functions for struct ttm_bo_global

[Christian König]

Yes, please! I had it on my TODO list to clean that up for an eternity.

Actually I never understood why that should be driver work to setup TTM?

I mean can't we just have a module_init/module_exit for TTM?

Thanks,
Christian.

Am 13.08.2018 um 12:24 schrieb Thomas Zimmermann:
> TTM uses global memory and BO for backing graphics buffers. These are
> represented by struct ttm_mem_global and struct ttm_bo_global.
>
> Currently, struct ttm_bo_global can only be initialized and released through
> struct ttm_bo_global_ref. This is a workaround for passing an instance of
> ttm_mem_global to the BO global initialization code.
>
> The use of struct ttm_bo_global_ref makes driver code unnecessary hard to
> understand. At the same time drivers can use any combination of memory and
> BO for initializing the global instances. This can result in subtle bugs
> when the order of initializing and releasing drivers changes.
>
> As a first step for resolving these problems, the provided patch set
> separates initialization and release of struct ttm_bo_global from
> struct ttm_bo_global_ref.
>
> The first patch only renames ttm_bo_global_{init/release}. Hopefully this
> change can be applied at once for all drivers.
>
> Future directions: All TTM-based drivers follow the same pattern for setting
> up the TTM. In a follow-up patch, this code can be moved into a single place
> and shared among drivers.
>
> Thomas Zimmermann (2):
>    drm/ttm: Rename ttm_bo_global_{init,release}() to
>      ttm_bo_global_ref_*()
>    drm/ttm: Provide ttm_bo_global_{init/release}() for struct
>      ttm_bo_global
>
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c     |  4 +-
>   drivers/gpu/drm/ast/ast_ttm.c               |  4 +-
>   drivers/gpu/drm/bochs/bochs_mm.c            |  4 +-
>   drivers/gpu/drm/cirrus/cirrus_ttm.c         |  4 +-
>   drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c |  4 +-
>   drivers/gpu/drm/mgag200/mgag200_ttm.c       |  4 +-
>   drivers/gpu/drm/nouveau/nouveau_ttm.c       |  4 +-
>   drivers/gpu/drm/qxl/qxl_ttm.c               |  4 +-
>   drivers/gpu/drm/radeon/radeon_ttm.c         |  4 +-
>   drivers/gpu/drm/ttm/ttm_bo.c                | 12 ++---
>   drivers/gpu/drm/virtio/virtgpu_ttm.c        |  4 +-
>   drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c    |  4 +-
>   drivers/staging/vboxvideo/vbox_ttm.c        |  4 +-
>   include/drm/ttm/ttm_bo_driver.h             | 53 ++++++++++++++++-----
>   14 files changed, 70 insertions(+), 43 deletions(-)
>
> --
> 2.18.0
>