Hi Linus,
This isn't the drm merge, however a few projects have been working together on a buffer sharing mechanism for kernel drivers, the maim interested parties are the Linaro/ARM SoC folks, V4L, DRM, and fbdev. Sumit Semwal wrote the code, and its been reviewed on various lists a fair few times.
Now we've all agreed that the initial implementation is a good baseline for us to move forward on, but its messy working with others when the core code is out of tree. So we'd like to merge the core dma-buf code now so we can all build on top of it for 3.4. I know some people would say we shouldn't merge things with no users, but it will really make our lives easier going forward to get this baseline into the tree.
Currently I've got most of a drm inter-driver buffer sharing mechanism built on top and there is also got a v4l consumer built. The code doesn't introduce any new userspace interfaces, its purely a kernel internal layer, that the consumer/exported layers like drm/v4l will plug into to offer services.
Dave.
The following changes since commit 805a6af8dba5dfdd35ec35dc52ec0122400b2610:
Linux 3.2 (2012-01-04 15:55:44 -0800)
are available in the git repository at: git://people.freedesktop.org/~airlied/linux dma-buf-merge
Sumit Semwal (3): dma-buf: Introduce dma buffer sharing mechanism dma-buf: Documentation for buffer sharing framework dma-buf: mark EXPERIMENTAL for 1st release.
Documentation/dma-buf-sharing.txt | 224 ++++++++++++++++++++++++++++ drivers/base/Kconfig | 11 ++ drivers/base/Makefile | 1 + drivers/base/dma-buf.c | 291 +++++++++++++++++++++++++++++++++++++ include/linux/dma-buf.h | 176 ++++++++++++++++++++++ 5 files changed, 703 insertions(+), 0 deletions(-) create mode 100644 Documentation/dma-buf-sharing.txt create mode 100644 drivers/base/dma-buf.c create mode 100644 include/linux/dma-buf.h