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linux/include/uapi
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Daniel Vetter 40c9d1c263 UPSTREAM: dma-buf: Add ioctls to allow userspace to flush 
The userspace might need some sort of cache coherency management e.g. when CPU
and GPU domains are being accessed through dma-buf at the same time. To
circumvent this problem there are begin/end coherency markers, that forward
directly to existing dma-buf device drivers vfunc hooks. Userspace can make use
of those markers through the DMA_BUF_IOCTL_SYNC ioctl. The sequence would be
used like following:
     - mmap dma-buf fd
     - for each drawing/upload cycle in CPU 1. SYNC_START ioctl, 2. read/write
       to mmap area 3. SYNC_END ioctl. This can be repeated as often as you
       want (with the new data being consumed by the GPU or say scanout device)
     - munmap once you don't need the buffer any more

BackPort:
  upstream kernel change dma-buf api with the commit(831e9da
  dma-buf: Remove range-based flush), avoid effect too much to
  current kernel, Just compatible dma-buf api to current version.

v2 (Tiago): Fix header file type names (u64 -> __u64)
v3 (Tiago): Add documentation. Use enum dma_buf_sync_flags to the begin/end
dma-buf functions. Check for overflows in start/length.
v4 (Tiago): use 2d regions for sync.
v5 (Tiago): forget about 2d regions (v4); use _IOW in DMA_BUF_IOCTL_SYNC and
remove range information from struct dma_buf_sync.
v6 (Tiago): use __u64 structured padded flags instead enum. Adjust
documentation about the recommendation on using sync ioctls.
v7 (Tiago): Alex' nit on flags definition and being even more wording in the
doc about sync usage.
v9 (Tiago): remove useless is_dma_buf_file check. Fix sync.flags conditionals
and its mask order check. Add <linux/types.h> include in dma-buf.h.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455228291-29640-1-git-send-email-tiago.vignatti@intel.com
(cherry picked from commit c11e391da2)

Change-Id: I92916babe7fb0ab3bf3ce9dc966408f2e05fe83d
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
2017-05-16 18:33:15 +08:00
..
asm-generic rk: revert to v3.10 2015-11-11 15:57:28 +08:00
drm FROMLIST: drm: Pass CRTC ID in userspace vblank events 2017-05-11 15:38:50 +08:00
linux UPSTREAM: dma-buf: Add ioctls to allow userspace to flush 2017-05-16 18:33:15 +08:00
misc
mtd mtd: mtd-user: remove stdint.h include 2015-10-19 18:19:06 -07:00
rdma Initial 4.4 merge window submission 2015-11-07 13:33:07 -08:00
scsi cxlflash: Fix to avoid virtual LUN failover failure 2016-09-15 08:27:49 +02:00
sound rk: revert to v3.10 2015-11-11 15:57:28 +08:00
video video: adf: ensure consistent alignment on userspace facing structs 2016-02-16 13:53:19 -08:00
xen xen/gntdev: use types from linux/types.h in userspace headers 2015-10-23 14:20:45 +01:00
Kbuild