[Intel-gfx] [PATCH v14 0/7] drm/i915/gvt: Dma-buf support for GVT-g

[Tina Zhang]

v13->v14:
1) add PROBE, DMABUF and REGION flags. (Alex)
2) return -ENXIO when gem proxy object is banned by ioctl.
   (Chris) (Daniel)
3) add some details about the float pixel format. (Daniel)
4) add F suffix to the defined name. (Daniel)
5) refine pixel format table. (Zhenyu)

v12->v13:
1) add comments to GEM proxy. (Chris)
2) don't ban GEM proxy in i915_gem_sw_finish_ioctl. (Chris)
3) check GEM proxy bar after finishing i915_gem_object_wait. (Chris)
4) remove GEM proxy bar in i915_gem_madvise_ioctl.

v11->v12:
1) add drm_format_mod back. (Gerd and Zhenyu)
2) add region_index. (Gerd)
3) refine the lifecycle of dmabuf.
4) send to dri-devel at lists.freedesktop.org. (Ville) 

v10->v11:
1) rename plane_type to drm_plane_type. (Gerd)
2) move fields of vfio_device_query_gfx_plane to
   vfio_device_gfx_plane_info. (Gerd)
3) remove drm_format_mod, start fields. (Daniel)
4) remove plane_id.

v9->v10:
1) remove dma-buf management
2) refine the ABI API VFIO_DEVICE_QUERY_GFX_PLANE
3) track the dma-buf create and release in kernel mode

v8->v9:
1) refine the dma-buf ioctl definition
2) add a lock to protect the dmabuf list
3) move drm format change to a separate patch
4) codes cleanup

v7->v8:
1) refine framebuffer decoder code
2) fix a bug in decoding primary plane

v6->v7:
1) release dma-buf related allocations in dma-buf's associated release
   function.
2) refine ioctl interface for querying plane info or create dma-buf
3) refine framebuffer decoder code
4) the patch series is based on 4.12.0-rc1

v5->v6:
1) align the dma-buf life cycle with the vfio device.
2) add the dma-buf related operations in a separate patch.
3) i915 releated changes.

v4->v5:
1) fix bug while checking whether the gem obj is gvt's dma-buf when user
   change caching mode or domains. Add a helper function to do it.
2) add definition for the query plane and create dma-buf.

v3->v4:
1) fix bug while checking whether the gem obj is gvt's dma-buf when set
   caching mode or doamins.

v2->v3:
1) add a field gvt_plane_info in the drm_i915_gem_obj structure to save
   the decoded plane information to avoid look up while need the plane info.
2) declare a new flag I915_GEM_OBJECT_IS_GVT_DMABUF in drm_i915_gem_object
   to represent the gem obj for gvt's dma-buf. The tiling mode, caching mode
   and domains can not be changed for this kind of gem object.
3) change dma-buf related information to be more generic. So other vendor
   can use the same interface.

v1->v2:
1) create a management fd for dma-buf operations.
2) alloc gem object's backing storage in gem obj's get_pages() callback.

This patch set adds the dma-buf support for intel GVT-g.
dma-buf is a uniform mechanism to share DMA buffers across different
devices and sub-systems.
dma-buf for intel GVT-g is mainly used to share the vgpu's framebuffer
to other users or sub-systems so they can use the dma-buf to show the
desktop of a VM which uses intel vgpu.

The main idea is we create a gem object and set vgpu's framebuffer as
the backing storage of this gem object. And associate this gem obj
to a dma-buf object then export this dma-buf at the meantime
generate a file descriptor for this dma-buf. Finally deliver this file
descriptor to user space. And user can use this dma-buf fd to do
rendering or other operations.

This patch set can be tried with the following example:
	https://github.com/01org/Igvtg-qemu  branch: topic/dmabuf

Tina Zhang (7):
  drm/i915/gvt: Add framebuffer decoder support
  drm: Introduce RGB 64-bit 16:16:16:16 float format
  drm/i915/gvt: Add RGB 64-bit 16:16:16:16 float format
  drm/i915/gvt: Add opregion support
  vfio: ABI for mdev display dma-buf operation
  drm/i915: Introduce GEM proxy
  drm/i915/gvt: Dmabuf support for GVT-g

 drivers/gpu/drm/i915/gvt/Makefile      |   3 +-
 drivers/gpu/drm/i915/gvt/display.c     |   2 +-
 drivers/gpu/drm/i915/gvt/display.h     |   2 +
 drivers/gpu/drm/i915/gvt/dmabuf.c      | 387 ++++++++++++++++++++++++
 drivers/gpu/drm/i915/gvt/dmabuf.h      |  58 ++++
 drivers/gpu/drm/i915/gvt/fb_decoder.c  | 521 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/gvt/fb_decoder.h  | 169 +++++++++++
 drivers/gpu/drm/i915/gvt/gvt.c         |   1 +
 drivers/gpu/drm/i915/gvt/gvt.h         |  10 +
 drivers/gpu/drm/i915/gvt/hypercall.h   |   3 +
 drivers/gpu/drm/i915/gvt/kvmgt.c       | 151 +++++++++-
 drivers/gpu/drm/i915/gvt/mpt.h         |  45 +++
 drivers/gpu/drm/i915/gvt/opregion.c    |  26 +-
 drivers/gpu/drm/i915/gvt/vgpu.c        |   6 +-
 drivers/gpu/drm/i915/i915_gem.c        |  24 +-
 drivers/gpu/drm/i915/i915_gem_object.h |   9 +
 drivers/gpu/drm/i915/i915_gem_tiling.c |   8 +
 include/uapi/drm/drm_fourcc.h          |   4 +
 include/uapi/linux/vfio.h              |  43 +++
 19 files changed, 1459 insertions(+), 13 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/gvt/dmabuf.c
 create mode 100644 drivers/gpu/drm/i915/gvt/dmabuf.h
 create mode 100644 drivers/gpu/drm/i915/gvt/fb_decoder.c
 create mode 100644 drivers/gpu/drm/i915/gvt/fb_decoder.h

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2.7.4