[PATCH v2 0/3] mmap on the dma-buf directly

Tiago Vignatti tiago.vignatti at intel.com
Wed Aug 5 15:13:08 PDT 2015


I've tested these patches (in drm-intel-nightly, but also in CrOS kernel
v3.14) and they seem just enough for what we want to do: 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. To validate it I've built a
test on top of igt's kms_pwrite_crc (which I'll be sending next for review).

Let me know your concerns.


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 (1):
  drm/i915: Use CPU mapping for userspace dma-buf mmap()

 drivers/dma-buf/dma-buf.c              | 47 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/drm_prime.c            | 10 +++-----
 drivers/gpu/drm/i915/i915_gem_dmabuf.c | 18 ++++++++++++-
 include/uapi/drm/drm.h                 |  1 +
 include/uapi/linux/dma-buf.h           | 39 ++++++++++++++++++++++++++++
 5 files changed, 107 insertions(+), 8 deletions(-)
 create mode 100644 include/uapi/linux/dma-buf.h


More information about the dri-devel mailing list