Documentation/ABI/testing/sysfs-bus-vfio-mdev

   1 What:           /sys/.../<device>/mdev_supported_types/
   2 Date:           October 2016
   3 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
   4 Description:
   5                 This directory contains list of directories of currently
   6                 supported mediated device types and their details for
   7                 <device>. Supported type attributes are defined by the
   8                 vendor driver who registers with Mediated device framework.
   9                 Each supported type is a directory whose name is created
  10                 by adding the device driver string as a prefix to the
  11                 string provided by the vendor driver.
  12
  13 What:           /sys/.../<device>/mdev_supported_types/<type-id>/
  14 Date:           October 2016
  15 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  16 Description:
  17                 This directory gives details of supported type, like name,
  18                 description, available_instances, device_api etc.
  19                 'device_api' and 'available_instances' are mandatory
  20                 attributes to be provided by vendor driver. 'name',
  21                 'description' and other vendor driver specific attributes
  22                 are optional.
  23
  24 What:           /sys/.../mdev_supported_types/<type-id>/create
  25 Date:           October 2016
  26 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  27 Description:
  28                 Writing UUID to this file will create mediated device of
  29                 type <type-id> for parent device <device>. This is a
  30                 write-only file.
  31                 For example:
  32                 # echo "83b8f4f2-509f-382f-3c1e-e6bfe0fa1001" > \
  33                        /sys/devices/foo/mdev_supported_types/foo-1/create
  34
  35 What:           /sys/.../mdev_supported_types/<type-id>/devices/
  36 Date:           October 2016
  37 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  38 Description:
  39                 This directory contains symbolic links pointing to mdev
  40                 devices sysfs entries which are created of this <type-id>.
  41
  42 What:           /sys/.../mdev_supported_types/<type-id>/available_instances
  43 Date:           October 2016
  44 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  45 Description:
  46                 Reading this attribute will show the number of mediated
  47                 devices of type <type-id> that can be created. This is a
  48                 readonly file.
  49 Users:
  50                 Userspace applications interested in creating mediated
  51                 device of that type. Userspace application should check
  52                 the number of available instances could be created before
  53                 creating mediated device of this type.
  54
  55 What:           /sys/.../mdev_supported_types/<type-id>/device_api
  56 Date:           October 2016
  57 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  58 Description:
  59                 Reading this attribute will show VFIO device API supported
  60                 by this type. For example, "vfio-pci" for a PCI device,
  61                 "vfio-platform" for platform device.
  62
  63 What:           /sys/.../mdev_supported_types/<type-id>/name
  64 Date:           October 2016
  65 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  66 Description:
  67                 Reading this attribute will show human readable name of the
  68                 mediated device that will get created of type <type-id>.
  69                 This is optional attribute. For example: "Grid M60-0Q"
  70 Users:
  71                 Userspace applications interested in knowing the name of
  72                 a particular <type-id> that can help in understanding the
  73                 type of mediated device.
  74
  75 What:           /sys/.../mdev_supported_types/<type-id>/description
  76 Date:           October 2016
  77 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  78 Description:
  79                 Reading this attribute will show description of the type of
  80                 mediated device that will get created of type <type-id>.
  81                 This is optional attribute. For example:
  82                 "2 heads, 512M FB, 2560x1600 maximum resolution"
  83 Users:
  84                 Userspace applications interested in knowing the details of
  85                 a particular <type-id> that can help in understanding the
  86                 features provided by that type of mediated device.
  87
  88 What:           /sys/.../<device>/<UUID>/
  89 Date:           October 2016
  90 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  91 Description:
  92                 This directory represents device directory of mediated
  93                 device. It contains all the attributes related to mediated
  94                 device.
  95
  96 What:           /sys/.../<device>/<UUID>/mdev_type
  97 Date:           October 2016
  98 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
  99 Description:
 100                 This is symbolic link pointing to supported type, <type-id>
 101                 directory of which this mediated device is created.
 102
 103 What:           /sys/.../<device>/<UUID>/remove
 104 Date:           October 2016
 105 Contact:        Kirti Wankhede <kwankhede@nvidia.com>
 106 Description:
 107                 Writing '1' to this file destroys the mediated device. The
 108                 vendor driver can fail the remove() callback if that device
 109                 is active and the vendor driver doesn't support hot unplug.
 110                 Example:
 111                 # echo 1 > /sys/bus/mdev/devices/<UUID>/remove