Thanks for the updates! I was comparing between your code and and evdi code (eventually meant for usb displaylink), and it looks pretty similar in concept. They have some hard-coding around kernel versions for specific drm interfaces, and I can't find enough documentation to figure out if any differences matter, but thought I would pass it on to see if it is of any help: https://github.com/DisplayLink/evdi
On Sun, Oct 15, 2017 at 12:30 PM, Noralf Trønnes <noralf@xxxxxxxxxxx> wrote:
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
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