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Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations

From Gerd Hoffmann <kraxel@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations
Date 2017-06-19 08:40 +0200
Message-ID <tTYvT-7uN-1@gated-at.bofh.it> (permalink)
References (1 earlier) <tSy0O-8r5-27@gated-at.bofh.it> <tSEpA-3Kz-25@gated-at.bofh.it> <tSFvk-4D9-17@gated-at.bofh.it> <tSJIC-7cs-25@gated-at.bofh.it> <tSZDH-Ds-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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  Hi,

> My suggestion was to use vfio device fd for this ioctl and have
> dmabuf
> mgr fd as member in above query_plane structure, for region type it
> would be set to 0.

Region type should be DRM_PLANE_TYPE_PRIMARY

> Can't mmap that page to get surface information. There is no way to
> synchronize between QEMU reading this mmapped region and vendor
> driver
> writing it. There could be race condition in these two operations.
> Read
> on this page should be trapped and blocking, so that surface in that
> region is only updated when its asked for.

Does it make sense to have a "generation" field in the plane_info
struct (which gets increased each time the struct changes) ?

cheers,
  Gerd

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Thread

[PATCH v9 0/7] drm/i915/gvt: Dma-buf support for GVT-g Xiaoguang Chen <xiaoguang.chen@intel.com> - 2017-06-15 10:10 +0200
  [PATCH v9 6/7] drm/i915/gvt: Dmabuf support for GVT-g Xiaoguang Chen <xiaoguang.chen@intel.com> - 2017-06-15 10:10 +0200
  [PATCH v9 4/7] drm/i915/gvt: Frame buffer decoder support for GVT-g Xiaoguang Chen <xiaoguang.chen@intel.com> - 2017-06-15 10:10 +0200
  [PATCH v9 3/7] drm: Extend the drm format Xiaoguang Chen <xiaoguang.chen@intel.com> - 2017-06-15 10:10 +0200
    Re: [Intel-gfx] [PATCH v9 3/7] drm: Extend the drm format Ville Syrjälä <ville.syrjala@linux.intel.com> - 2017-06-15 12:30 +0200
  [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Xiaoguang Chen <xiaoguang.chen@intel.com> - 2017-06-15 10:10 +0200
    Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Kirti Wankhede <kwankhede@nvidia.com> - 2017-06-15 17:00 +0200
      Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Gerd Hoffmann <kraxel@redhat.com> - 2017-06-15 18:10 +0200
        Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Alex Williamson <alex.williamson@redhat.com> - 2017-06-15 22:40 +0200
          Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Gerd Hoffmann <kraxel@redhat.com> - 2017-06-16 12:30 +0200
            Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Alex Williamson <alex.williamson@redhat.com> - 2017-06-16 15:00 +0200
          Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Kirti Wankhede <kwankhede@nvidia.com> - 2017-06-16 15:40 +0200
            Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Alex Williamson <alex.williamson@redhat.com> - 2017-06-16 18:50 +0200
              Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Kirti Wankhede <kwankhede@nvidia.com> - 2017-06-16 20:30 +0200
              Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Gerd Hoffmann <kraxel@redhat.com> - 2017-06-19 08:40 +0200
                Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Alex Williamson <alex.williamson@redhat.com> - 2017-06-19 17:00 +0200
            Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Gerd Hoffmann <kraxel@redhat.com> - 2017-06-19 08:40 +0200
              Re: [PATCH v9 5/7] vfio: Define vfio based dma-buf operations Alex Williamson <alex.williamson@redhat.com> - 2017-06-19 17:00 +0200

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