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 memory-management code for simple 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_vram_object| and helpers (GEM VRAM). It's a GEM object that is backed by VRAM. The type's purpose is somewhat similar to |struct drm_gem_{cma, shmem}_object|: it provides an commom implementation that handles all the basic cases. Second, the patch set introduces |struct drm_vram_mm| and helpers (VRAM MM). It's an implementation of a basic memory manager for VRAM.
Both, GEM VRAM and VRAM MM, support buffer placement in VRAM and system memory. 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.
Future directions: with these changes, the respective drivers can also share some of their mode-setting or fbdev code. GEM VRAM could implement PRIME helpers, which would allow for using the generic fbcon.
The patch set is against a recent drm-tip.
v3: * share VRAM MM callback structure among drivers * move VRAM MM instances to drm_device and share rsp. code v2: * rename |struct drm_gem_ttm_object| to |struct drm_gem_vram_object| * rename |struct drm_simple_ttm| to |struct drm_vram_mm| * make drm_is_gem_ttm() an internal helper * add drm_gem_vram_kmap_at() * return is_iomem from kmap functions * redefine TTM placement flags for public interface * add drm_vram_mm_mmap() helper * replace almost all of driver's TTM code with these helpers * documentation fixes
Thomas Zimmermann (19): drm: Add |struct drm_gem_vram_object| and helpers drm: Add |struct drm_gem_vram_object| callbacks for |struct ttm_bo_driver| drm: Add |struct drm_gem_vram_object| callbacks for |struct drm_driver| drm: Add drm_gem_vram_fill_create_dumb() to create dumb buffers drm: Add VRAM MM, a simple memory manager for dedicated VRAM drm: Add default instance for VRAM MM callback functions drm: Integrate VRAM MM into struct drm_device drm/ast: Convert AST driver to |struct drm_gem_vram_object| drm/ast: Convert AST driver to VRAM MM drm/ast: Replace mapping code with drm_gem_vram_{kmap/kunmap}() drm/bochs: Convert bochs driver to |struct drm_gem_vram_object| drm/bochs: Convert bochs driver to VRAM MM drm/mgag200: Convert mgag200 driver to |struct drm_gem_vram_object| drm/mgag200: Convert mgag200 driver to VRAM MM drm/mgag200: Replace mapping code with drm_gem_vram_{kmap/kunmap}() drm/vboxvideo: Convert vboxvideo driver to |struct drm_gem_vram_object| drm/vboxvideo: Convert vboxvideo driver to VRAM MM drm/hisilicon: Convert hibmc-drm driver to |struct drm_gem_vram_object| drm/hisilicon: Convert hibmc-drm driver to VRAM MM
Documentation/gpu/drm-mm.rst | 25 +- drivers/gpu/drm/Kconfig | 20 + drivers/gpu/drm/Makefile | 5 + drivers/gpu/drm/ast/Kconfig | 3 +- drivers/gpu/drm/ast/ast_drv.c | 13 +- drivers/gpu/drm/ast/ast_drv.h | 71 +- drivers/gpu/drm/ast/ast_fb.c | 30 +- drivers/gpu/drm/ast/ast_main.c | 77 +-- drivers/gpu/drm/ast/ast_mode.c | 124 ++-- drivers/gpu/drm/ast/ast_ttm.c | 302 +-------- drivers/gpu/drm/bochs/Kconfig | 2 + drivers/gpu/drm/bochs/bochs.h | 47 +- drivers/gpu/drm/bochs/bochs_drv.c | 13 +- drivers/gpu/drm/bochs/bochs_kms.c | 18 +- drivers/gpu/drm/bochs/bochs_mm.c | 408 +----------- drivers/gpu/drm/drm_gem_vram_helper.c | 612 ++++++++++++++++++ drivers/gpu/drm/drm_vram_helper_common.c | 6 + drivers/gpu/drm/drm_vram_mm_helper.c | 278 ++++++++ drivers/gpu/drm/hisilicon/hibmc/Kconfig | 2 + .../gpu/drm/hisilicon/hibmc/hibmc_drm_de.c | 21 +- .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 13 +- .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h | 33 +- .../gpu/drm/hisilicon/hibmc/hibmc_drm_fbdev.c | 30 +- drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c | 341 +--------- drivers/gpu/drm/mgag200/Kconfig | 2 + drivers/gpu/drm/mgag200/mgag200_cursor.c | 88 +-- drivers/gpu/drm/mgag200/mgag200_drv.c | 13 +- drivers/gpu/drm/mgag200/mgag200_drv.h | 74 +-- drivers/gpu/drm/mgag200/mgag200_fb.c | 30 +- drivers/gpu/drm/mgag200/mgag200_main.c | 87 +-- drivers/gpu/drm/mgag200/mgag200_mode.c | 52 +- drivers/gpu/drm/mgag200/mgag200_ttm.c | 301 +-------- drivers/gpu/drm/vboxvideo/Kconfig | 2 + drivers/gpu/drm/vboxvideo/vbox_drv.c | 12 +- drivers/gpu/drm/vboxvideo/vbox_drv.h | 75 +-- drivers/gpu/drm/vboxvideo/vbox_fb.c | 22 +- drivers/gpu/drm/vboxvideo/vbox_main.c | 75 +-- drivers/gpu/drm/vboxvideo/vbox_mode.c | 36 +- drivers/gpu/drm/vboxvideo/vbox_ttm.c | 355 +--------- include/drm/drm_device.h | 4 + include/drm/drm_gem_vram_helper.h | 139 ++++ include/drm/drm_vram_mm_helper.h | 99 +++ 42 files changed, 1581 insertions(+), 2379 deletions(-) create mode 100644 drivers/gpu/drm/drm_gem_vram_helper.c create mode 100644 drivers/gpu/drm/drm_vram_helper_common.c create mode 100644 drivers/gpu/drm/drm_vram_mm_helper.c create mode 100644 include/drm/drm_gem_vram_helper.h create mode 100644 include/drm/drm_vram_mm_helper.h
-- 2.21.0