[PATCH 0/6] DRM: Unified VMA Offset Manager

[Rob Clark]

On Mon, Jul 1, 2013 at 2:32 PM, David Herrmann <dh.herrmann at gmail.com> wrote:
> Hi
>
> I picked up the initial work from Dave [1], fixed several bugs, rewrote the
> drm_mm node handling and adjusted the different drivers.
> The series tries to replace the VMA-offset managers from GEM and TTM with a
> single unified implementation. It uses the TTM RBTree idea to allow sub-mappings
> (which wouldn't be feasible with hashtables).
>
> Changes to Dave's v1:
>  * Fixed a ref-count bug in TTM during object lookup
>  * Use embedded drm_mm_node objects to avoid allocations
>  * Document drm_vma_* API
>  * Reviewed TTM locking
>  * Fixed all new drivers
>  * Use node->vm_pages instead of obj->size for GEM size calculations
>
> Notes:
>  * Tested on nouveau only! I will try to test i915 this week. However, the
>    gem changes seem pretty trivial.
>  * I couldn't even compile-test the ARM drivers. However, the omapdrm diffs
>    are the only changes that are non-trivial. Is there any ongoing work to
>    remove the arch-deps in DRM drivers?

I think most of the arm drivers should support ARCH_MULTIPLATFORM now,
so at least if you have a cross compiler it should be pretty easy to
compile-test most of the arm drm drivers..

BR,
-R

>  * _DRM_GEM is no longer used, but I guess we need to keep it for backwards
>    compat?
>  * If we replace node_list in drm_mm with an rbtree, we can drop it from
>    drm_vma_offset_manager completely. However, I wanted to avoid heavy drm_mm
>    changes and left this for follow up patches.
>  * This is currently based on linux-3.10 from today. Next series will be
>    rebased on drm-next/linux-next, but the current -next trees continously break
>    my machines..
>    But the only changes should be to fix additional drivers. I didn't see any
>    other things to fix for drm-next.
>
> Another series, which I will send later, adds "struct file" lists for each
> drm-vma-offset so we can get access control over gem objects. Also, I have an
> experimental series to remove the allocation helpers in drm_mm and let drivers
> embed drm_mm_node instead. Lets see how that works out.
>
> Comments welcome!
> Cheers
> David
>
> [1]: http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-vma-manager
>
> David Herrmann (6):
>   drm: make drm_mm_init() return void
>   drm: mm: add drm_mm_node_linked() helper
>   drm: add unified vma offset manager
>   drm: gem: convert to new unified vma manager
>   drm: ttm: convert to unified vma offset manager
>   drm: provide generic drm_vma_node_unmap() helper
>
>  drivers/gpu/drm/Makefile                   |   2 +-
>  drivers/gpu/drm/ast/ast_main.c             |   2 +-
>  drivers/gpu/drm/cirrus/cirrus_main.c       |   2 +-
>  drivers/gpu/drm/drm_gem.c                  |  93 ++----------
>  drivers/gpu/drm/drm_gem_cma_helper.c       |   9 +-
>  drivers/gpu/drm/drm_mm.c                   |   5 +-
>  drivers/gpu/drm/drm_vma_manager.c          | 224 +++++++++++++++++++++++++++++
>  drivers/gpu/drm/exynos/exynos_drm_gem.c    |   7 +-
>  drivers/gpu/drm/gma500/gem.c               |   8 +-
>  drivers/gpu/drm/i915/i915_gem.c            |  13 +-
>  drivers/gpu/drm/mgag200/mgag200_main.c     |   2 +-
>  drivers/gpu/drm/nouveau/nouveau_display.c  |   2 +-
>  drivers/gpu/drm/nouveau/nouveau_gem.c      |   2 +-
>  drivers/gpu/drm/omapdrm/omap_gem.c         |  11 +-
>  drivers/gpu/drm/omapdrm/omap_gem_helpers.c |  49 +------
>  drivers/gpu/drm/qxl/qxl_object.h           |   2 +-
>  drivers/gpu/drm/qxl/qxl_release.c          |   2 +-
>  drivers/gpu/drm/radeon/radeon_object.h     |   5 +-
>  drivers/gpu/drm/ttm/ttm_bo.c               |  82 ++---------
>  drivers/gpu/drm/ttm/ttm_bo_manager.c       |   8 +-
>  drivers/gpu/drm/ttm/ttm_bo_util.c          |   3 +-
>  drivers/gpu/drm/ttm/ttm_bo_vm.c            |  81 ++++-------
>  drivers/gpu/drm/udl/udl_gem.c              |   6 +-
>  drivers/gpu/drm/vmwgfx/vmwgfx_resource.c   |   4 +-
>  include/drm/drmP.h                         |   7 +-
>  include/drm/drm_mm.h                       |  11 +-
>  include/drm/drm_vma_manager.h              | 122 ++++++++++++++++
>  include/drm/ttm/ttm_bo_api.h               |  15 +-
>  include/drm/ttm/ttm_bo_driver.h            |   7 +-
>  include/uapi/drm/drm.h                     |   2 +-
>  30 files changed, 464 insertions(+), 324 deletions(-)
>  create mode 100644 drivers/gpu/drm/drm_vma_manager.c
>  create mode 100644 include/drm/drm_vma_manager.h
>
> --
> 1.8.3.2
>
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