drm: Add shmem GEM library

Submitted by Noralf Trønnes on July 12, 2017, 1:45 p.m.

Details

Reviewer None
Submitted July 12, 2017, 1:45 p.m.
Last Updated Oct. 17, 2018, 1:05 p.m.
Revision 6

Cover Letter

This patchset adds a library for shmem backed GEM objects and makes use
of it in tinydrm.

Daniel suggested that I make a generic mmap function for GEM PRIME.
I wondered if I could make it the default for drm_driver->gem_prime_mmap
so I looked at all the drivers that don't set that callback:
- armada, i915, omap and udl has their own dmabuf implementations.
- nouveau and radeon use drm_gem_prime_export(), but don't set the
  ->gem_prime_mmap callback.

Making it default would change the behaviour of those last two so I let
it be.

I'm cc'ing intel-gfx to have the CI look at the core changes I've made.
I can't exercise all the codepaths using vc4 and tinydrm.

Noralf.

Changes since version 4:
- Add drm_gem_prime_mmap() (Daniel Vetter)
- Drop drm_gem_object_funcs->prime_mmap
- drm_gem_shmem_mmap(): Subtract drm_vma_node_start() to get the real
  vma->vm_pgoff
- drm_gem_shmem_fault(): Use vmf->pgoff now that vma->vm_pgoff is
  correct

Changes since version 3:
- Drop cache modes (Thomas Hellstrom)
- Add a GEM object attached vtable

Changes since version 2:
- Grammar (Sam Ravnborg)
- s/drm_gem_shmem_put_pages_unlocked/drm_gem_shmem_put_pages_locked/
  (Sam Ravnborg)
- Add debug ouput in error path (Sam Ravnborg)

Changes since version 1:
- Fix missing argument in docs (kbuild test robot)
- Fix: sparse: expression using sizeof(void) (kbuild test robot)
- Rebasing gave a new checkpatch warning, so I changed to bitfields:
CHECK: Avoid using bool structure members because of possible alignment
issues - see: https://lkml.org/lkml/2017/11/21/384
#834: FILE: include/drm/drm_gem_shmem_helper.h:84:
+       bool pages_mark_dirty_on_put;
#841: FILE: include/drm/drm_gem_shmem_helper.h:91:
+       bool pages_mark_accessed_on_put;

Noralf Trønnes (5):
  drm/driver: Add defaults for .gem_prime_export/import callbacks
  drm/prime: Add drm_gem_prime_mmap()
  drm/gem: Add drm_gem_object_funcs
  drm: Add library for shmem backed GEM objects
  drm/tinydrm: Switch from CMA to shmem buffers

 Documentation/gpu/drm-kms-helpers.rst          |  12 +
 Documentation/gpu/todo.rst                     |   7 +
 drivers/gpu/drm/Kconfig                        |   6 +
 drivers/gpu/drm/Makefile                       |   1 +
 drivers/gpu/drm/drm_client.c                   |  12 +-
 drivers/gpu/drm/drm_gem.c                      | 109 ++++-
 drivers/gpu/drm/drm_gem_shmem_helper.c         | 551 +++++++++++++++++++++++++
 drivers/gpu/drm/drm_prime.c                    |  79 +++-
 drivers/gpu/drm/tinydrm/Kconfig                |   2 +-
 drivers/gpu/drm/tinydrm/core/tinydrm-core.c    |  92 ++---
 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c |   5 +
 drivers/gpu/drm/tinydrm/ili9225.c              |  14 +-
 drivers/gpu/drm/tinydrm/ili9341.c              |   6 +-
 drivers/gpu/drm/tinydrm/mi0283qt.c             |   6 +-
 drivers/gpu/drm/tinydrm/mipi-dbi.c             |  38 +-
 drivers/gpu/drm/tinydrm/repaper.c              |  24 +-
 drivers/gpu/drm/tinydrm/st7586.c               |  15 +-
 drivers/gpu/drm/tinydrm/st7735r.c              |   6 +-
 include/drm/drm_drv.h                          |   4 +
 include/drm/drm_gem.h                          | 131 ++++++
 include/drm/drm_gem_shmem_helper.h             | 153 +++++++
 include/drm/drm_prime.h                        |   1 +
 include/drm/tinydrm/tinydrm.h                  |  36 +-
 23 files changed, 1122 insertions(+), 188 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_gem_shmem_helper.c
 create mode 100644 include/drm/drm_gem_shmem_helper.h
  

Revisions