[PATCH 4/6] Documentation/driver-api/vfio-mediated-device.rst: Update for vfio/mdev aggregation support

[Zhenyu Wang <zhenyuw@linux.intel.com>]

Update vfio/mdev doc on new "aggregate" create parameter, new "aggregation"
attribute and "aggregated_instances" attribute for mdev device.

Cc: Kirti Wankhede <kwankhede@nvidia.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
---
 .../driver-api/vfio-mediated-device.rst       | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Documentation/driver-api/vfio-mediated-device.rst b/Documentation/driver-api/vfio-mediated-device.rst
index 25eb7d5b834b..2881be654516 100644
--- a/Documentation/driver-api/vfio-mediated-device.rst
+++ b/Documentation/driver-api/vfio-mediated-device.rst
@@ -216,6 +216,7 @@ Directories and files under the sysfs for Each Physical Device
   |          |--- available_instances
   |          |--- device_api
   |          |--- description
+  |          |--- <aggregation>
   |          |--- [devices]
 
 * [mdev_supported_types]
@@ -260,6 +261,21 @@ Directories and files under the sysfs for Each Physical Device
   This attribute should show brief features/description of the type. This is
   optional attribute.
 
+* <aggregation>
+
+  <aggregation> is an optional attributes to show maximum number that the
+  instance resources of [<type-id>] can be aggregated to be assigned
+  for one mdev device. No <aggregation> attribute means driver doesn't
+  support to aggregate instance resoures for one mdev device.
+
+  Set number of instances by appending "aggregate=N" parameter for
+  create attribute. By default without "aggregate=N" parameter it
+  will create one instance as normal.
+
+Example::
+
+	# echo "<uuid>,aggregate=N" > create
+
 Directories and Files Under the sysfs for Each mdev Device
 ----------------------------------------------------------
 
@@ -268,6 +284,7 @@ Directories and Files Under the sysfs for Each mdev Device
   |- [parent phy device]
   |--- [$MDEV_UUID]
          |--- remove
+         |--- <aggregated_instances>
          |--- mdev_type {link to its type}
          |--- vendor-specific-attributes [optional]
 
@@ -281,6 +298,12 @@ Example::
 
 	# echo 1 > /sys/bus/mdev/devices/$mdev_UUID/remove
 
+* <aggregated_instances> (read only)
+
+For mdev created with aggregate parameter, this shows number of
+instances assigned for this mdev. For normal type this attribute will
+not exist.
+
 Mediated device Hot plug
 ------------------------
 
-- 
2.24.0.rc0