[PATCH 00/15] Share TTM code among framebuffer drivers

[Thomas Zimmermann]

Several simple framebuffer drivers copy most of the TTM code from each
other. The implementation is always the same; except for the name of
some data structures.

As recently discussed, this patch set provides generic TTM memory-
management code for framebuffers with dedicated video memory. It further
converts the respective drivers to the generic code. The shared code
is basically the same implementation as the one copied among individual
drivers.

The patch set contains two major changes: first, it introduces
|struct drm_gem_ttm_object| and helpers. It's a GEM object that is
backed by TTM-managed memory. The type's purpose is somewhat similar
to |struct drm_gem_{cma, shmem}_object|. Second, the patch set
introduces |struct drm_simple_ttm| (for the lack of a better name) and
helpers. It's an implementation of a basic TTM-based memory manager.

Both, GEM TTM and Simple TTM, support VRAM and SYSTEM placements. Support
for TT could probably be added if necessary. Both can be used independedly
from each other if desired by the DRM driver.

Currently ast, bochs, mgag200, vboxvideo and hisilicon/hibmc can use
these helpers. Cirrus would also be a candidate, but as it's being
rewrtten from scratch, I didn't bother doing the conversion.

Future directions: with these changes, the respective drivers can also
share some of their mode-setting or fbdev code. GEM TTM could implement
PRIME helpers, which would allow for using the generic fbcon.

The patch set is against a recent drm-tip.

Thomas Zimmermann (15):
  drm: Add |struct drm_gem_ttm_object| and helpers
  drm: Add |struct drm_gem_ttm_object| callbacks for |struct
    ttm_bo_driver|
  drm: Add |struct drm_gem_ttm_object| callbacks for |struct drm_driver|
  drm: Add drm_gem_ttm_fill_create_dumb() to create dumb buffers
  drm: Add Simple TTM, a memory manager for dedicated VRAM
  drm/ast: Convert AST driver to |struct drm_gem_ttm_object|
  drm/ast: Convert AST driver to Simple TTM
  drm/bochs: Convert Bochs driver to |struct drm_gem_ttm_object|
  drm/bochs: Convert Bochs driver to Simple TTM
  drm/mgag200: Convert mgag200 driver to |struct drm_gem_ttm_object|
  drm/mgag200: Convert mgag200 driver to Simple TTM
  drm/vboxvideo: Convert vboxvideo driver to |struct drm_gem_ttm_object|
  drm/vboxvideo: Convert vboxvideo driver to Simple TTM
  drm/hisilicon: Convert hibmc-drm driver to |struct drm_gem_ttm_object|
  drm/hisilicon: Convert hibmc-drm driver to Simple TTM

 Documentation/gpu/drm-mm.rst                  |  23 +
 drivers/gpu/drm/Kconfig                       |  20 +
 drivers/gpu/drm/Makefile                      |   5 +
 drivers/gpu/drm/ast/Kconfig                   |   3 +-
 drivers/gpu/drm/ast/ast_drv.c                 |   4 +-
 drivers/gpu/drm/ast/ast_drv.h                 |  58 +-
 drivers/gpu/drm/ast/ast_fb.c                  |  18 +-
 drivers/gpu/drm/ast/ast_main.c                |  74 +--
 drivers/gpu/drm/ast/ast_mode.c                |  78 +--
 drivers/gpu/drm/ast/ast_ttm.c                 | 290 +---------
 drivers/gpu/drm/bochs/Kconfig                 |   2 +
 drivers/gpu/drm/bochs/bochs.h                 |  42 +-
 drivers/gpu/drm/bochs/bochs_drv.c             |   4 +-
 drivers/gpu/drm/bochs/bochs_kms.c             |  18 +-
 drivers/gpu/drm/bochs/bochs_mm.c              | 392 +-------------
 drivers/gpu/drm/drm_gem_ttm_helper.c          | 507 ++++++++++++++++++
 drivers/gpu/drm/drm_simple_ttm_helper.c       | 191 +++++++
 drivers/gpu/drm/drm_ttm_helper_common.c       |   6 +
 drivers/gpu/drm/hisilicon/hibmc/Kconfig       |   2 +
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_de.c    |  19 +-
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c   |   4 +-
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h   |  28 +-
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_fbdev.c |  30 +-
 drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c   | 328 +----------
 drivers/gpu/drm/mgag200/Kconfig               |   2 +
 drivers/gpu/drm/mgag200/mgag200_cursor.c      |  61 ++-
 drivers/gpu/drm/mgag200/mgag200_drv.c         |   4 +-
 drivers/gpu/drm/mgag200/mgag200_drv.h         |  68 +--
 drivers/gpu/drm/mgag200/mgag200_fb.c          |  18 +-
 drivers/gpu/drm/mgag200/mgag200_main.c        |  84 +--
 drivers/gpu/drm/mgag200/mgag200_mode.c        |  45 +-
 drivers/gpu/drm/mgag200/mgag200_ttm.c         | 290 +---------
 drivers/gpu/drm/vboxvideo/Kconfig             |   2 +
 drivers/gpu/drm/vboxvideo/vbox_drv.c          |   5 +-
 drivers/gpu/drm/vboxvideo/vbox_drv.h          |  64 +--
 drivers/gpu/drm/vboxvideo/vbox_fb.c           |  22 +-
 drivers/gpu/drm/vboxvideo/vbox_main.c         |  70 +--
 drivers/gpu/drm/vboxvideo/vbox_mode.c         |  36 +-
 drivers/gpu/drm/vboxvideo/vbox_ttm.c          | 344 +-----------
 include/drm/drm_gem_ttm_helper.h              | 119 ++++
 include/drm/drm_simple_ttm_helper.h           |  74 +++
 41 files changed, 1292 insertions(+), 2162 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_gem_ttm_helper.c
 create mode 100644 drivers/gpu/drm/drm_simple_ttm_helper.c
 create mode 100644 drivers/gpu/drm/drm_ttm_helper_common.c
 create mode 100644 include/drm/drm_gem_ttm_helper.h
 create mode 100644 include/drm/drm_simple_ttm_helper.h

--
2.21.0