[PATCH v2 0/8] drm/tinydrm: Use vmalloc BO

[Noralf Trønnes]

This patchset adds a library for vmalloc buffer objects and makes use of
it in tinydrm.

The reason I want to move away from the cma helper, is that it restricts
which drivers to PRIME import from, since cma requires the buffer to be
physically continuous. Initially I looked at udl and decided to use
shmem, but have later decided against it since shmem doesn't work with
fbdev deferred I/O, they both use page->lru and page->mapping. This
meant adding a shadow buffer for fbdev with increased complexity, so I
fell back to the KISS principle.

I'm trying to make tinydrm support drivers like simpledrm and udl, so if
using vmalloc blocks those use cases, please let me know.

I will do a follow up for the cma library which removes struct
drm_fbdev_cma and wrappers.

Noralf.

Changes since version 1:
- tinydrm: Remove dma_coerce_mask_and_coherent() calls (Matt Gattis)

Noralf Trønnes (8):
  drm/fb-helper: Handle function NULL argument
  drm: Add drm_device->fbdev pointer
  drm/fb-helper: Add simple init/fini functions
  drm/fb-helper: Add .last_close and .output_poll_changed helpers
  drm/gem-fb-helper: Add drm_gem_fb_debugfs_show()
  drm: Add vmalloc BO helper
  drm/tinydrm: Use drm_vmalloc_bo
  drm/tinydrm: Relax buffer line prefetch

 Documentation/gpu/drm-kms-helpers.rst          |  12 +
 drivers/gpu/drm/Kconfig                        |   7 +
 drivers/gpu/drm/Makefile                       |   1 +
 drivers/gpu/drm/drm_fb_helper.c                | 223 +++++++++++++++++-
 drivers/gpu/drm/drm_gem_framebuffer_helper.c   |  45 ++++
 drivers/gpu/drm/drm_vmalloc_bo_helper.c        | 305 +++++++++++++++++++++++++
 drivers/gpu/drm/tinydrm/Kconfig                |   2 +-
 drivers/gpu/drm/tinydrm/core/tinydrm-core.c    | 134 +++--------
 drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c |  56 +++--
 drivers/gpu/drm/tinydrm/mi0283qt.c             |   8 +-
 drivers/gpu/drm/tinydrm/mipi-dbi.c             |  31 +--
 drivers/gpu/drm/tinydrm/repaper.c              |  21 +-
 drivers/gpu/drm/tinydrm/st7586.c               |  14 +-
 include/drm/drm_device.h                       |   8 +
 include/drm/drm_fb_helper.h                    |  32 +++
 include/drm/drm_gem_framebuffer_helper.h       |   6 +
 include/drm/drm_vmalloc_bo_helper.h            |  88 +++++++
 include/drm/tinydrm/mipi-dbi.h                 |   2 +
 include/drm/tinydrm/tinydrm.h                  |  38 +--
 19 files changed, 811 insertions(+), 222 deletions(-)
 create mode 100644 drivers/gpu/drm/drm_vmalloc_bo_helper.c
 create mode 100644 include/drm/drm_vmalloc_bo_helper.h

-- 
2.14.2