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misc: IBM Virtual Management Channel Driver (VMC)
This driver is a logical device which provides an interface between the hypervisor and a management partition. This interface is like a message passing interface. This management partition is intended to provide an alternative to HMC-based system management. VMC enables the Management LPAR to provide basic logical partition functions: - Logical Partition Configuration - Boot, start, and stop actions for individual partitions - Display of partition status - Management of virtual Ethernet - Management of virtual Storage - Basic system management This driver is to be used for the POWER Virtual Management Channel Virtual Adapter on the PowerPC platform. It provides a character device which allows for both request/response and async message support through the /dev/ibmvmc node. Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Reviewed-by: Steven Royer <seroyer@linux.vnet.ibm.com> Reviewed-by: Adam Reznechek <adreznec@linux.vnet.ibm.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Tested-by: Taylor Jakobson <tjakobs@us.ibm.com> Tested-by: Brad Warrum <bwarrum@us.ibm.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bryant G. Ly
Greg Kroah-Hartman
parent
5b7d127726
commit
0eca353e7a
@ -327,6 +327,7 @@ Code Seq#(hex) Include File Comments
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0xCA 80-BF uapi/scsi/cxlflash_ioctl.h
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0xCB 00-1F CBM serial IEC bus in development:
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<mailto:michael.klein@puffin.lb.shuttle.de>
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0xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver
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0xCD 01 linux/reiserfs_fs.h
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0xCF 02 fs/cifs/ioctl.c
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0xDB 00-0F drivers/char/mwave/mwavepub.h
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226
Documentation/misc-devices/ibmvmc.rst
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226
Documentation/misc-devices/ibmvmc.rst
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@ -0,0 +1,226 @@
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.. SPDX-License-Identifier: GPL-2.0+
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======================================================
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IBM Virtual Management Channel Kernel Driver (IBMVMC)
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======================================================
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:Authors:
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Dave Engebretsen <engebret@us.ibm.com>,
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Adam Reznechek <adreznec@linux.vnet.ibm.com>,
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Steven Royer <seroyer@linux.vnet.ibm.com>,
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Bryant G. Ly <bryantly@linux.vnet.ibm.com>,
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Introduction
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============
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Note: Knowledge of virtualization technology is required to understand
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this document.
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A good reference document would be:
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https://openpowerfoundation.org/wp-content/uploads/2016/05/LoPAPR_DRAFT_v11_24March2016_cmt1.pdf
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The Virtual Management Channel (VMC) is a logical device which provides an
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interface between the hypervisor and a management partition. This interface
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is like a message passing interface. This management partition is intended
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to provide an alternative to systems that use a Hardware Management
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Console (HMC) - based system management.
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The primary hardware management solution that is developed by IBM relies
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on an appliance server named the Hardware Management Console (HMC),
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packaged as an external tower or rack-mounted personal computer. In a
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Power Systems environment, a single HMC can manage multiple POWER
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processor-based systems.
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Management Application
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----------------------
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In the management partition, a management application exists which enables
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a system administrator to configure the system’s partitioning
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characteristics via a command line interface (CLI) or Representational
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State Transfer Application (REST API's).
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The management application runs on a Linux logical partition on a
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POWER8 or newer processor-based server that is virtualized by PowerVM.
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System configuration, maintenance, and control functions which
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traditionally require an HMC can be implemented in the management
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application using a combination of HMC to hypervisor interfaces and
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existing operating system methods. This tool provides a subset of the
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functions implemented by the HMC and enables basic partition configuration.
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The set of HMC to hypervisor messages supported by the management
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application component are passed to the hypervisor over a VMC interface,
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which is defined below.
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The VMC enables the management partition to provide basic partitioning
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functions:
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- Logical Partitioning Configuration
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- Start, and stop actions for individual partitions
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- Display of partition status
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- Management of virtual Ethernet
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- Management of virtual Storage
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- Basic system management
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Virtual Management Channel (VMC)
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--------------------------------
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A logical device, called the Virtual Management Channel (VMC), is defined
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for communicating between the management application and the hypervisor. It
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basically creates the pipes that enable virtualization management
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software. This device is presented to a designated management partition as
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a virtual device.
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This communication device uses Command/Response Queue (CRQ) and the
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Remote Direct Memory Access (RDMA) interfaces. A three-way handshake is
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defined that must take place to establish that both the hypervisor and
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management partition sides of the channel are running prior to
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sending/receiving any of the protocol messages.
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This driver also utilizes Transport Event CRQs. CRQ messages are sent
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when the hypervisor detects one of the peer partitions has abnormally
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terminated, or one side has called H_FREE_CRQ to close their CRQ.
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Two new classes of CRQ messages are introduced for the VMC device. VMC
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Administrative messages are used for each partition using the VMC to
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communicate capabilities to their partner. HMC Interface messages are used
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for the actual flow of HMC messages between the management partition and
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the hypervisor. As most HMC messages far exceed the size of a CRQ buffer,
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a virtual DMA (RMDA) of the HMC message data is done prior to each HMC
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Interface CRQ message. Only the management partition drives RDMA
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operations; hypervisors never directly cause the movement of message data.
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Terminology
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-----------
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RDMA
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Remote Direct Memory Access is DMA transfer from the server to its
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client or from the server to its partner partition. DMA refers
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to both physical I/O to and from memory operations and to memory
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to memory move operations.
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CRQ
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Command/Response Queue a facility which is used to communicate
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between partner partitions. Transport events which are signaled
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from the hypervisor to partition are also reported in this queue.
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Example Management Partition VMC Driver Interface
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=================================================
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This section provides an example for the management application
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implementation where a device driver is used to interface to the VMC
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device. This driver consists of a new device, for example /dev/ibmvmc,
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which provides interfaces to open, close, read, write, and perform
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ioctl’s against the VMC device.
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VMC Interface Initialization
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----------------------------
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The device driver is responsible for initializing the VMC when the driver
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is loaded. It first creates and initializes the CRQ. Next, an exchange of
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VMC capabilities is performed to indicate the code version and number of
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resources available in both the management partition and the hypervisor.
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Finally, the hypervisor requests that the management partition create an
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initial pool of VMC buffers, one buffer for each possible HMC connection,
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which will be used for management application session initialization.
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Prior to completion of this initialization sequence, the device returns
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EBUSY to open() calls. EIO is returned for all open() failures.
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::
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Management Partition Hypervisor
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CRQ INIT
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---------------------------------------->
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CRQ INIT COMPLETE
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<----------------------------------------
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CAPABILITIES
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---------------------------------------->
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CAPABILITIES RESPONSE
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<----------------------------------------
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ADD BUFFER (HMC IDX=0,1,..) _
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<---------------------------------------- |
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ADD BUFFER RESPONSE | - Perform # HMCs Iterations
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----------------------------------------> -
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VMC Interface Open
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------------------
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After the basic VMC channel has been initialized, an HMC session level
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connection can be established. The application layer performs an open() to
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the VMC device and executes an ioctl() against it, indicating the HMC ID
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(32 bytes of data) for this session. If the VMC device is in an invalid
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state, EIO will be returned for the ioctl(). The device driver creates a
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new HMC session value (ranging from 1 to 255) and HMC index value (starting
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at index 0 and ranging to 254) for this HMC ID. The driver then does an
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RDMA of the HMC ID to the hypervisor, and then sends an Interface Open
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message to the hypervisor to establish the session over the VMC. After the
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hypervisor receives this information, it sends Add Buffer messages to the
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management partition to seed an initial pool of buffers for the new HMC
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connection. Finally, the hypervisor sends an Interface Open Response
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message, to indicate that it is ready for normal runtime messaging. The
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following illustrates this VMC flow:
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::
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Management Partition Hypervisor
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RDMA HMC ID
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---------------------------------------->
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Interface Open
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---------------------------------------->
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Add Buffer _
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<---------------------------------------- |
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Add Buffer Response | - Perform N Iterations
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----------------------------------------> -
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Interface Open Response
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<----------------------------------------
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VMC Interface Runtime
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---------------------
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During normal runtime, the management application and the hypervisor
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exchange HMC messages via the Signal VMC message and RDMA operations. When
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sending data to the hypervisor, the management application performs a
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write() to the VMC device, and the driver RDMA’s the data to the hypervisor
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and then sends a Signal Message. If a write() is attempted before VMC
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device buffers have been made available by the hypervisor, or no buffers
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are currently available, EBUSY is returned in response to the write(). A
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write() will return EIO for all other errors, such as an invalid device
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state. When the hypervisor sends a message to the management, the data is
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put into a VMC buffer and an Signal Message is sent to the VMC driver in
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the management partition. The driver RDMA’s the buffer into the partition
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and passes the data up to the appropriate management application via a
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read() to the VMC device. The read() request blocks if there is no buffer
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available to read. The management application may use select() to wait for
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the VMC device to become ready with data to read.
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::
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Management Partition Hypervisor
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MSG RDMA
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---------------------------------------->
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SIGNAL MSG
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---------------------------------------->
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SIGNAL MSG
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<----------------------------------------
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MSG RDMA
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<----------------------------------------
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VMC Interface Close
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-------------------
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HMC session level connections are closed by the management partition when
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the application layer performs a close() against the device. This action
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results in an Interface Close message flowing to the hypervisor, which
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causes the session to be terminated. The device driver must free any
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storage allocated for buffers for this HMC connection.
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::
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Management Partition Hypervisor
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INTERFACE CLOSE
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---------------------------------------->
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INTERFACE CLOSE RESPONSE
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<----------------------------------------
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Additional Information
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======================
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For more information on the documentation for CRQ Messages, VMC Messages,
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HMC interface Buffers, and signal messages please refer to the Linux on
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Power Architecture Platform Reference. Section F.
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@ -6757,6 +6757,12 @@ L: linux-scsi@vger.kernel.org
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S: Supported
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F: drivers/scsi/ibmvscsi/ibmvfc*
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IBM Power Virtual Management Channel Driver
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M: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
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M: Steven Royer <seroyer@linux.vnet.ibm.com>
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S: Supported
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F: drivers/misc/ibmvmc.*
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IBM Power Virtual SCSI Device Drivers
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M: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
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L: linux-scsi@vger.kernel.org
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@ -279,6 +279,7 @@
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#define H_GET_MPP_X 0x314
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#define H_SET_MODE 0x31C
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#define H_CLEAR_HPT 0x358
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#define H_REQUEST_VMC 0x360
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#define H_RESIZE_HPT_PREPARE 0x36C
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#define H_RESIZE_HPT_COMMIT 0x370
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#define H_REGISTER_PROC_TBL 0x37C
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@ -113,6 +113,20 @@ config IBM_ASM
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for information on the specific driver level and support statement
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for your IBM server.
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config IBMVMC
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tristate "IBM Virtual Management Channel support"
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depends on PPC_PSERIES
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help
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This is the IBM POWER Virtual Management Channel
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This driver is to be used for the POWER Virtual
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Management Channel virtual adapter on the PowerVM
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platform. It provides both request/response and
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async message support through the /dev/ibmvmc node.
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To compile this driver as a module, choose M here: the
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module will be called ibmvmc.
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config PHANTOM
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tristate "Sensable PHANToM (PCI)"
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depends on PCI
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@ -4,6 +4,7 @@
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#
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obj-$(CONFIG_IBM_ASM) += ibmasm/
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obj-$(CONFIG_IBMVMC) += ibmvmc.o
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obj-$(CONFIG_AD525X_DPOT) += ad525x_dpot.o
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obj-$(CONFIG_AD525X_DPOT_I2C) += ad525x_dpot-i2c.o
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obj-$(CONFIG_AD525X_DPOT_SPI) += ad525x_dpot-spi.o
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2418
drivers/misc/ibmvmc.c
Normal file
2418
drivers/misc/ibmvmc.c
Normal file
File diff suppressed because it is too large
Load Diff
209
drivers/misc/ibmvmc.h
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209
drivers/misc/ibmvmc.h
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/* SPDX-License-Identifier: GPL-2.0+
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*
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* linux/drivers/misc/ibmvmc.h
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*
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* IBM Power Systems Virtual Management Channel Support.
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*
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* Copyright (c) 2004, 2018 IBM Corp.
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* Dave Engebretsen engebret@us.ibm.com
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* Steven Royer seroyer@linux.vnet.ibm.com
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* Adam Reznechek adreznec@linux.vnet.ibm.com
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* Bryant G. Ly <bryantly@linux.vnet.ibm.com>
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*/
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#ifndef IBMVMC_H
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#define IBMVMC_H
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#include <linux/types.h>
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#include <linux/cdev.h>
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#include <asm/vio.h>
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#define IBMVMC_PROTOCOL_VERSION 0x0101
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#define MIN_BUF_POOL_SIZE 16
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#define MIN_HMCS 1
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#define MIN_MTU 4096
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#define MAX_BUF_POOL_SIZE 64
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#define MAX_HMCS 2
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#define MAX_MTU (4 * 4096)
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#define DEFAULT_BUF_POOL_SIZE 32
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#define DEFAULT_HMCS 1
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#define DEFAULT_MTU 4096
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#define HMC_ID_LEN 32
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#define VMC_INVALID_BUFFER_ID 0xFFFF
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/* ioctl numbers */
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#define VMC_BASE 0xCC
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#define VMC_IOCTL_SETHMCID _IOW(VMC_BASE, 0x00, unsigned char *)
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#define VMC_IOCTL_QUERY _IOR(VMC_BASE, 0x01, struct ibmvmc_query_struct)
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#define VMC_IOCTL_REQUESTVMC _IOR(VMC_BASE, 0x02, u32)
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#define VMC_MSG_CAP 0x01
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#define VMC_MSG_CAP_RESP 0x81
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#define VMC_MSG_OPEN 0x02
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#define VMC_MSG_OPEN_RESP 0x82
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#define VMC_MSG_CLOSE 0x03
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#define VMC_MSG_CLOSE_RESP 0x83
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#define VMC_MSG_ADD_BUF 0x04
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#define VMC_MSG_ADD_BUF_RESP 0x84
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#define VMC_MSG_REM_BUF 0x05
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#define VMC_MSG_REM_BUF_RESP 0x85
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#define VMC_MSG_SIGNAL 0x06
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#define VMC_MSG_SUCCESS 0
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#define VMC_MSG_INVALID_HMC_INDEX 1
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#define VMC_MSG_INVALID_BUFFER_ID 2
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#define VMC_MSG_CLOSED_HMC 3
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#define VMC_MSG_INTERFACE_FAILURE 4
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#define VMC_MSG_NO_BUFFER 5
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#define VMC_BUF_OWNER_ALPHA 0
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#define VMC_BUF_OWNER_HV 1
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enum ibmvmc_states {
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ibmvmc_state_sched_reset = -1,
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ibmvmc_state_initial = 0,
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ibmvmc_state_crqinit = 1,
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ibmvmc_state_capabilities = 2,
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ibmvmc_state_ready = 3,
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ibmvmc_state_failed = 4,
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};
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enum ibmhmc_states {
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/* HMC connection not established */
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ibmhmc_state_free = 0,
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/* HMC connection established (open called) */
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ibmhmc_state_initial = 1,
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/* open msg sent to HV, due to ioctl(1) call */
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ibmhmc_state_opening = 2,
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/* HMC connection ready, open resp msg from HV */
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ibmhmc_state_ready = 3,
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/* HMC connection failure */
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ibmhmc_state_failed = 4,
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};
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struct ibmvmc_buffer {
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u8 valid; /* 1 when DMA storage allocated to buffer */
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u8 free; /* 1 when buffer available for the Alpha Partition */
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u8 owner;
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u16 id;
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u32 size;
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u32 msg_len;
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dma_addr_t dma_addr_local;
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dma_addr_t dma_addr_remote;
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void *real_addr_local;
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};
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struct ibmvmc_admin_crq_msg {
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u8 valid; /* RPA Defined */
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u8 type; /* ibmvmc msg type */
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u8 status; /* Response msg status. Zero is success and on failure,
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* either 1 - General Failure, or 2 - Invalid Version is
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* returned.
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*/
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u8 rsvd[2];
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u8 max_hmc; /* Max # of independent HMC connections supported */
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__be16 pool_size; /* Maximum number of buffers supported per HMC
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* connection
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*/
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__be32 max_mtu; /* Maximum message size supported (bytes) */
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__be16 crq_size; /* # of entries available in the CRQ for the
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* source partition. The target partition must
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* limit the number of outstanding messages to
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* one half or less.
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*/
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__be16 version; /* Indicates the code level of the management partition
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* or the hypervisor with the high-order byte
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* indicating a major version and the low-order byte
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* indicating a minor version.
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*/
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};
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struct ibmvmc_crq_msg {
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u8 valid; /* RPA Defined */
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u8 type; /* ibmvmc msg type */
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u8 status; /* Response msg status */
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union {
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u8 rsvd; /* Reserved */
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u8 owner;
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} var1;
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u8 hmc_session; /* Session Identifier for the current VMC connection */
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u8 hmc_index; /* A unique HMC Idx would be used if multiple management
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* applications running concurrently were desired
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*/
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union {
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__be16 rsvd;
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__be16 buffer_id;
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} var2;
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__be32 rsvd;
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union {
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__be32 rsvd;
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||||
__be32 lioba;
|
||||
__be32 msg_len;
|
||||
} var3;
|
||||
};
|
||||
|
||||
/* an RPA command/response transport queue */
|
||||
struct crq_queue {
|
||||
struct ibmvmc_crq_msg *msgs;
|
||||
int size, cur;
|
||||
dma_addr_t msg_token;
|
||||
spinlock_t lock;
|
||||
};
|
||||
|
||||
/* VMC server adapter settings */
|
||||
struct crq_server_adapter {
|
||||
struct device *dev;
|
||||
struct crq_queue queue;
|
||||
u32 liobn;
|
||||
u32 riobn;
|
||||
struct tasklet_struct work_task;
|
||||
wait_queue_head_t reset_wait_queue;
|
||||
struct task_struct *reset_task;
|
||||
};
|
||||
|
||||
/* Driver wide settings */
|
||||
struct ibmvmc_struct {
|
||||
u32 state;
|
||||
u32 max_mtu;
|
||||
u32 max_buffer_pool_size;
|
||||
u32 max_hmc_index;
|
||||
struct crq_server_adapter *adapter;
|
||||
struct cdev cdev;
|
||||
u32 vmc_drc_index;
|
||||
};
|
||||
|
||||
struct ibmvmc_file_session;
|
||||
|
||||
/* Connection specific settings */
|
||||
struct ibmvmc_hmc {
|
||||
u8 session;
|
||||
u8 index;
|
||||
u32 state;
|
||||
struct crq_server_adapter *adapter;
|
||||
spinlock_t lock;
|
||||
unsigned char hmc_id[HMC_ID_LEN];
|
||||
struct ibmvmc_buffer buffer[MAX_BUF_POOL_SIZE];
|
||||
unsigned short queue_outbound_msgs[MAX_BUF_POOL_SIZE];
|
||||
int queue_head, queue_tail;
|
||||
struct ibmvmc_file_session *file_session;
|
||||
};
|
||||
|
||||
struct ibmvmc_file_session {
|
||||
struct file *file;
|
||||
struct ibmvmc_hmc *hmc;
|
||||
bool valid;
|
||||
};
|
||||
|
||||
struct ibmvmc_query_struct {
|
||||
int have_vmc;
|
||||
int state;
|
||||
int vmc_drc_index;
|
||||
};
|
||||
|
||||
#endif /* __IBMVMC_H */
|
||||
Loading…
Reference in New Issue
Block a user