• Tina Zhang's avatar
    drm/i915/gvt: Dmabuf support for GVT-g · e546e281
    Tina Zhang authored
    This patch introduces a guest's framebuffer sharing mechanism based on
    dma-buf subsystem. With this sharing mechanism, guest's framebuffer can
    be shared between guest VM and host.
    
    v17:
    - modify VFIO_DEVICE_GET_GFX_DMABUF interface. (Alex)
    
    v16:
    - add x_hot and y_hot. (Gerd)
    - add flag validation for VFIO_DEVICE_GET_GFX_DMABUF. (Alex)
    - rebase 4.14.0-rc6.
    
    v15:
    - add VFIO_DEVICE_GET_GFX_DMABUF ABI. (Gerd)
    - add intel_vgpu_dmabuf_cleanup() to clean up the vGPU's dmabuf. (Gerd)
    
    v14:
    - add PROBE, DMABUF and REGION flags. (Alex)
    
    v12:
    - refine the lifecycle of dmabuf.
    
    v9:
    - remove dma-buf management. (Alex)
    - track the dma-buf create and release in kernel mode. (Gerd) (Daniel)
    
    v8:
    - refine the dma-buf ioctl definition.(Alex)
    - add a lock to protect the dmabuf list. (Alex)
    
    v7:
    - release dma-buf related allocations in dma-buf's associated release
      function. (Alex)
    - refine ioctl interface for querying plane info or create dma-buf.
      (Alex)
    
    v6:
    - align the dma-buf life cycle with the vfio device. (Alex)
    - add the dma-buf related operations in a separate patch. (Gerd)
    - i915 related changes. (Chris)
    
    v5:
    - 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.
      (Xiaoguang)
    - add definition for the query plane and create dma-buf. (Xiaoguang)
    
    v4:
    - fix bug while checking whether the gem obj is gvt's dma-buf when set
      caching mode or doamins. (Xiaoguang)
    
    v3:
    - 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. (Alex)
    - change dma-buf related information to be more generic. So other vendor
      can use the same interface. (Alex)
    
    v2:
    - create a management fd for dma-buf operations. (Alex)
    - alloc gem object's backing storage in gem obj's get_pages() callback.
      (Chris)
    Signed-off-by: default avatarTina Zhang <tina.zhang@intel.com>
    Cc: Alex Williamson <alex.williamson@redhat.com>
    Cc: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: Gerd Hoffmann <kraxel@redhat.com>
    Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
    e546e281
gvt.c 11.7 KB