[PATCH v4] mmap on the dma-buf directly

Tiago Vignatti tiago.vignatti at intel.com
Wed Aug 12 16:29:09 PDT 2015


The idea is to create a GEM bo in one process and pass the prime handle of the
it to another process, which in turn uses the handle only to map and write.
This could be useful for Chrome OS architecture, where the Web content
("unpriviledged process") maps and CPU-draws a buffer, which was previously
allocated in the GPU process ("priviledged process").

In v2, I've added a patch that Daniel kindly drafted to allow the
unpriviledged process flush through a prime fd. In v3, I've fixed a few
concerns and then added end_cpu_access to i915. In v4, I fixed Sumit Semwal's
concerns about dma-duf documentation and the FIXME missing in that same patch,
and also removed WARN in i915 dma-buf mmap (pointed by Chris). PTAL.

Best Regards,


Daniel Thompson (1):
  drm: prime: Honour O_RDWR during prime-handle-to-fd

Daniel Vetter (1):
  dma-buf: Add ioctls to allow userspace to flush

Tiago Vignatti (2):
  drm/i915: Implement end_cpu_access
  drm/i915: Use CPU mapping for userspace dma-buf mmap()

 Documentation/dma-buf-sharing.txt      | 12 ++++++++
 drivers/dma-buf/dma-buf.c              | 50 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/drm_prime.c            | 10 ++-----
 drivers/gpu/drm/i915/i915_gem_dmabuf.c | 28 ++++++++++++++++++-
 include/uapi/drm/drm.h                 |  1 +
 include/uapi/linux/dma-buf.h           | 43 +++++++++++++++++++++++++++++
 6 files changed, 136 insertions(+), 8 deletions(-)
 create mode 100644 include/uapi/linux/dma-buf.h


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