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@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 releated 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 render or other operations.
Tina Zhang (6): 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 support drm/i915/gvt: add opregion support vfio: ABI for mdev display dma-buf operation drm/i915: Introduce GEM proxy
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/fb_decoder.c | 440 +++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/gvt/fb_decoder.h | 175 +++++++++++++ drivers/gpu/drm/i915/gvt/gvt.h | 1 + drivers/gpu/drm/i915/gvt/hypercall.h | 1 + drivers/gpu/drm/i915/gvt/kvmgt.c | 109 +++++++- drivers/gpu/drm/i915/gvt/mpt.h | 15 ++ drivers/gpu/drm/i915/gvt/opregion.c | 26 +- drivers/gpu/drm/i915/gvt/vgpu.c | 4 + drivers/gpu/drm/i915/i915_gem.c | 26 +- drivers/gpu/drm/i915/i915_gem_object.h | 9 + drivers/gpu/drm/i915/i915_gem_tiling.c | 5 + include/uapi/drm/drm_fourcc.h | 4 + include/uapi/linux/vfio.h | 28 +++ 16 files changed, 838 insertions(+), 12 deletions(-) create mode 100644 drivers/gpu/drm/i915/gvt/fb_decoder.c create mode 100644 drivers/gpu/drm/i915/gvt/fb_decoder.h