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+/*
+ * ipmi.h
+ *
+ * MontaVista IPMI interface
+ *
+ * Author: MontaVista Software, Inc.
+ * Corey Minyard <minyard@mvista.com>
+ * source@mvista.com
+ *
+ * Copyright 2002 MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __LINUX_IPMI_H
+#define __LINUX_IPMI_H
+
+#include <linux/ipmi_msgdefs.h>
+
+/*
+ * This file describes an interface to an IPMI driver. You have to
+ * have a fairly good understanding of IPMI to use this, so go read
+ * the specs first before actually trying to do anything.
+ *
+ * With that said, this driver provides a multi-user interface to the
+ * IPMI driver, and it allows multiple IPMI physical interfaces below
+ * the driver. The physical interfaces bind as a lower layer on the
+ * driver. They appear as interfaces to the application using this
+ * interface.
+ *
+ * Multi-user means that multiple applications may use the driver,
+ * send commands, receive responses, etc. The driver keeps track of
+ * commands the user sends and tracks the responses. The responses
+ * will go back to the application that send the command. If the
+ * response doesn't come back in time, the driver will return a
+ * timeout error response to the application. Asynchronous events
+ * from the BMC event queue will go to all users bound to the driver.
+ * The incoming event queue in the BMC will automatically be flushed
+ * if it becomes full and it is queried once a second to see if
+ * anything is in it. Incoming commands to the driver will get
+ * delivered as commands.
+ *
+ * This driver provides two main interfaces: one for in-kernel
+ * applications and another for userland applications. The
+ * capabilities are basically the same for both interface, although
+ * the interfaces are somewhat different. The stuff in the
+ * #ifdef KERNEL below is the in-kernel interface. The userland
+ * interface is defined later in the file. */
+
+
+
+/*
+ * This is an overlay for all the address types, so it's easy to
+ * determine the actual address type. This is kind of like addresses
+ * work for sockets.
+ */
+#define IPMI_MAX_ADDR_SIZE 32
+struct ipmi_addr
+{
+ /* Try to take these from the "Channel Medium Type" table
+ in section 6.5 of the IPMI 1.5 manual. */
+ int addr_type;
+ short channel;
+ char data[IPMI_MAX_ADDR_SIZE];
+};
+
+/*
+ * When the address is not used, the type will be set to this value.
+ * The channel is the BMC's channel number for the channel (usually
+ * 0), or IPMC_BMC_CHANNEL if communicating directly with the BMC.
+ */
+#define IPMI_SYSTEM_INTERFACE_ADDR_TYPE 0x0c
+struct ipmi_system_interface_addr
+{
+ int addr_type;
+ short channel;
+ unsigned char lun;
+};
+
+/* An IPMB Address. */
+#define IPMI_IPMB_ADDR_TYPE 0x01
+/* Used for broadcast get device id as described in section 17.9 of the
+ IPMI 1.5 manual. */
+#define IPMI_IPMB_BROADCAST_ADDR_TYPE 0x41
+struct ipmi_ipmb_addr
+{
+ int addr_type;
+ short channel;
+ unsigned char slave_addr;
+ unsigned char lun;
+};
+
+/*
+ * A LAN Address. This is an address to/from a LAN interface bridged
+ * by the BMC, not an address actually out on the LAN.
+ *
+ * A concious decision was made here to deviate slightly from the IPMI
+ * spec. We do not use rqSWID and rsSWID like it shows in the
+ * message. Instead, we use remote_SWID and local_SWID. This means
+ * that any message (a request or response) from another device will
+ * always have exactly the same address. If you didn't do this,
+ * requests and responses from the same device would have different
+ * addresses, and that's not too cool.
+ *
+ * In this address, the remote_SWID is always the SWID the remote
+ * message came from, or the SWID we are sending the message to.
+ * local_SWID is always our SWID. Note that having our SWID in the
+ * message is a little weird, but this is required.
+ */
+#define IPMI_LAN_ADDR_TYPE 0x04
+struct ipmi_lan_addr
+{
+ int addr_type;
+ short channel;
+ unsigned char privilege;
+ unsigned char session_handle;
+ unsigned char remote_SWID;
+ unsigned char local_SWID;
+ unsigned char lun;
+};
+
+
+/*
+ * Channel for talking directly with the BMC. When using this
+ * channel, This is for the system interface address type only. FIXME
+ * - is this right, or should we use -1?
+ */
+#define IPMI_BMC_CHANNEL 0xf
+#define IPMI_NUM_CHANNELS 0x10
+
+
+/*
+ * A raw IPMI message without any addressing. This covers both
+ * commands and responses. The completion code is always the first
+ * byte of data in the response (as the spec shows the messages laid
+ * out).
+ */
+struct ipmi_msg
+{
+ unsigned char netfn;
+ unsigned char cmd;
+ unsigned short data_len;
+ unsigned char __user *data;
+};
+
+struct kernel_ipmi_msg
+{
+ unsigned char netfn;
+ unsigned char cmd;
+ unsigned short data_len;
+ unsigned char *data;
+};
+
+/*
+ * Various defines that are useful for IPMI applications.
+ */
+#define IPMI_INVALID_CMD_COMPLETION_CODE 0xC1
+#define IPMI_TIMEOUT_COMPLETION_CODE 0xC3
+#define IPMI_UNKNOWN_ERR_COMPLETION_CODE 0xff
+
+
+/*
+ * Receive types for messages coming from the receive interface. This
+ * is used for the receive in-kernel interface and in the receive
+ * IOCTL.
+ *
+ * The "IPMI_RESPONSE_RESPNOSE_TYPE" is a little strange sounding, but
+ * it allows you to get the message results when you send a response
+ * message.
+ */
+#define IPMI_RESPONSE_RECV_TYPE 1 /* A response to a command */
+#define IPMI_ASYNC_EVENT_RECV_TYPE 2 /* Something from the event queue */
+#define IPMI_CMD_RECV_TYPE 3 /* A command from somewhere else */
+#define IPMI_RESPONSE_RESPONSE_TYPE 4 /* The response for
+ a sent response, giving any
+ error status for sending the
+ response. When you send a
+ response message, this will
+ be returned. */
+/* Note that async events and received commands do not have a completion
+ code as the first byte of the incoming data, unlike a response. */
+
+
+
+#ifdef __KERNEL__
+
+/*
+ * The in-kernel interface.
+ */
+#include <linux/list.h>
+#include <linux/module.h>
+
+/* Opaque type for a IPMI message user. One of these is needed to
+ send and receive messages. */
+typedef struct ipmi_user *ipmi_user_t;
+
+/*
+ * Stuff coming from the receive interface comes as one of these.
+ * They are allocated, the receiver must free them with
+ * ipmi_free_recv_msg() when done with the message. The link is not
+ * used after the message is delivered, so the upper layer may use the
+ * link to build a linked list, if it likes.
+ */
+struct ipmi_recv_msg
+{
+ struct list_head link;
+
+ /* The type of message as defined in the "Receive Types"
+ defines above. */
+ int recv_type;
+
+ ipmi_user_t user;
+ struct ipmi_addr addr;
+ long msgid;
+ struct kernel_ipmi_msg msg;
+
+ /* The user_msg_data is the data supplied when a message was
+ sent, if this is a response to a sent message. If this is
+ not a response to a sent message, then user_msg_data will
+ be NULL. */
+ void *user_msg_data;
+
+ /* Call this when done with the message. It will presumably free
+ the message and do any other necessary cleanup. */
+ void (*done)(struct ipmi_recv_msg *msg);
+
+ /* Place-holder for the data, don't make any assumptions about
+ the size or existance of this, since it may change. */
+ unsigned char msg_data[IPMI_MAX_MSG_LENGTH];
+};
+
+/* Allocate and free the receive message. */
+static inline void ipmi_free_recv_msg(struct ipmi_recv_msg *msg)
+{
+ msg->done(msg);
+}
+
+struct ipmi_user_hndl
+{
+ /* Routine type to call when a message needs to be routed to
+ the upper layer. This will be called with some locks held,
+ the only IPMI routines that can be called are ipmi_request
+ and the alloc/free operations. The handler_data is the
+ variable supplied when the receive handler was registered. */
+ void (*ipmi_recv_hndl)(struct ipmi_recv_msg *msg,
+ void *user_msg_data);
+
+ /* Called when the interface detects a watchdog pre-timeout. If
+ this is NULL, it will be ignored for the user. */
+ void (*ipmi_watchdog_pretimeout)(void *handler_data);
+};
+
+/* Create a new user of the IPMI layer on the given interface number. */
+int ipmi_create_user(unsigned int if_num,
+ struct ipmi_user_hndl *handler,
+ void *handler_data,
+ ipmi_user_t *user);
+
+/* Destroy the given user of the IPMI layer. Note that after this
+ function returns, the system is guaranteed to not call any
+ callbacks for the user. Thus as long as you destroy all the users
+ before you unload a module, you will be safe. And if you destroy
+ the users before you destroy the callback structures, it should be
+ safe, too. */
+int ipmi_destroy_user(ipmi_user_t user);
+
+/* Get the IPMI version of the BMC we are talking to. */
+void ipmi_get_version(ipmi_user_t user,
+ unsigned char *major,
+ unsigned char *minor);
+
+/* Set and get the slave address and LUN that we will use for our
+ source messages. Note that this affects the interface, not just
+ this user, so it will affect all users of this interface. This is
+ so some initialization code can come in and do the OEM-specific
+ things it takes to determine your address (if not the BMC) and set
+ it for everyone else. */
+void ipmi_set_my_address(ipmi_user_t user,
+ unsigned char address);
+unsigned char ipmi_get_my_address(ipmi_user_t user);
+void ipmi_set_my_LUN(ipmi_user_t user,
+ unsigned char LUN);
+unsigned char ipmi_get_my_LUN(ipmi_user_t user);
+
+/*
+ * Like ipmi_request, but lets you specify the number of retries and
+ * the retry time. The retries is the number of times the message
+ * will be resent if no reply is received. If set to -1, the default
+ * value will be used. The retry time is the time in milliseconds
+ * between retries. If set to zero, the default value will be
+ * used.
+ *
+ * Don't use this unless you *really* have to. It's primarily for the
+ * IPMI over LAN converter; since the LAN stuff does its own retries,
+ * it makes no sense to do it here. However, this can be used if you
+ * have unusual requirements.
+ */
+int ipmi_request_settime(ipmi_user_t user,
+ struct ipmi_addr *addr,
+ long msgid,
+ struct kernel_ipmi_msg *msg,
+ void *user_msg_data,
+ int priority,
+ int max_retries,
+ unsigned int retry_time_ms);
+
+/*
+ * Like ipmi_request, but with messages supplied. This will not
+ * allocate any memory, and the messages may be statically allocated
+ * (just make sure to do the "done" handling on them). Note that this
+ * is primarily for the watchdog timer, since it should be able to
+ * send messages even if no memory is available. This is subject to
+ * change as the system changes, so don't use it unless you REALLY
+ * have to.
+ */
+int ipmi_request_supply_msgs(ipmi_user_t user,
+ struct ipmi_addr *addr,
+ long msgid,
+ struct kernel_ipmi_msg *msg,
+ void *user_msg_data,
+ void *supplied_smi,
+ struct ipmi_recv_msg *supplied_recv,
+ int priority);
+
+/*
+ * When commands come in to the SMS, the user can register to receive
+ * them. Only one user can be listening on a specific netfn/cmd pair
+ * at a time, you will get an EBUSY error if the command is already
+ * registered. If a command is received that does not have a user
+ * registered, the driver will automatically return the proper
+ * error.
+ */
+int ipmi_register_for_cmd(ipmi_user_t user,
+ unsigned char netfn,
+ unsigned char cmd);
+int ipmi_unregister_for_cmd(ipmi_user_t user,
+ unsigned char netfn,
+ unsigned char cmd);
+
+/*
+ * Allow run-to-completion mode to be set for the interface of
+ * a specific user.
+ */
+void ipmi_user_set_run_to_completion(ipmi_user_t user, int val);
+
+/*
+ * When the user is created, it will not receive IPMI events by
+ * default. The user must set this to TRUE to get incoming events.
+ * The first user that sets this to TRUE will receive all events that
+ * have been queued while no one was waiting for events.
+ */
+int ipmi_set_gets_events(ipmi_user_t user, int val);
+
+/*
+ * Called when a new SMI is registered. This will also be called on
+ * every existing interface when a new watcher is registered with
+ * ipmi_smi_watcher_register().
+ */
+struct ipmi_smi_watcher
+{
+ struct list_head link;
+
+ /* You must set the owner to the current module, if you are in
+ a module (generally just set it to "THIS_MODULE"). */
+ struct module *owner;
+
+ /* These two are called with read locks held for the interface
+ the watcher list. So you can add and remove users from the
+ IPMI interface, send messages, etc., but you cannot add
+ or remove SMI watchers or SMI interfaces. */
+ void (*new_smi)(int if_num);
+ void (*smi_gone)(int if_num);
+};
+
+int ipmi_smi_watcher_register(struct ipmi_smi_watcher *watcher);
+int ipmi_smi_watcher_unregister(struct ipmi_smi_watcher *watcher);
+
+/* The following are various helper functions for dealing with IPMI
+ addresses. */
+
+/* Return the maximum length of an IPMI address given it's type. */
+unsigned int ipmi_addr_length(int addr_type);
+
+/* Validate that the given IPMI address is valid. */
+int ipmi_validate_addr(struct ipmi_addr *addr, int len);
+
+#endif /* __KERNEL__ */
+
+
+/*
+ * The userland interface
+ */
+
+/*
+ * The userland interface for the IPMI driver is a standard character
+ * device, with each instance of an interface registered as a minor
+ * number under the major character device.
+ *
+ * The read and write calls do not work, to get messages in and out
+ * requires ioctl calls because of the complexity of the data. select
+ * and poll do work, so you can wait for input using the file
+ * descriptor, you just can use read to get it.
+ *
+ * In general, you send a command down to the interface and receive
+ * responses back. You can use the msgid value to correlate commands
+ * and responses, the driver will take care of figuring out which
+ * incoming messages are for which command and find the proper msgid
+ * value to report. You will only receive reponses for commands you
+ * send. Asynchronous events, however, go to all open users, so you
+ * must be ready to handle these (or ignore them if you don't care).
+ *
+ * The address type depends upon the channel type. When talking
+ * directly to the BMC (IPMC_BMC_CHANNEL), the address is ignored
+ * (IPMI_UNUSED_ADDR_TYPE). When talking to an IPMB channel, you must
+ * supply a valid IPMB address with the addr_type set properly.
+ *
+ * When talking to normal channels, the driver takes care of the
+ * details of formatting and sending messages on that channel. You do
+ * not, for instance, have to format a send command, you just send
+ * whatever command you want to the channel, the driver will create
+ * the send command, automatically issue receive command and get even
+ * commands, and pass those up to the proper user.
+ */
+
+
+/* The magic IOCTL value for this interface. */
+#define IPMI_IOC_MAGIC 'i'
+
+
+/* Messages sent to the interface are this format. */
+struct ipmi_req
+{
+ unsigned char __user *addr; /* Address to send the message to. */
+ unsigned int addr_len;
+
+ long msgid; /* The sequence number for the message. This
+ exact value will be reported back in the
+ response to this request if it is a command.
+ If it is a response, this will be used as
+ the sequence value for the response. */
+
+ struct ipmi_msg msg;
+};
+/*
+ * Send a message to the interfaces. error values are:
+ * - EFAULT - an address supplied was invalid.
+ * - EINVAL - The address supplied was not valid, or the command
+ * was not allowed.
+ * - EMSGSIZE - The message to was too large.
+ * - ENOMEM - Buffers could not be allocated for the command.
+ */
+#define IPMICTL_SEND_COMMAND _IOR(IPMI_IOC_MAGIC, 13, \
+ struct ipmi_req)
+
+/* Messages sent to the interface with timing parameters are this
+ format. */
+struct ipmi_req_settime
+{
+ struct ipmi_req req;
+
+ /* See ipmi_request_settime() above for details on these
+ values. */
+ int retries;
+ unsigned int retry_time_ms;
+};
+/*
+ * Send a message to the interfaces with timing parameters. error values
+ * are:
+ * - EFAULT - an address supplied was invalid.
+ * - EINVAL - The address supplied was not valid, or the command
+ * was not allowed.
+ * - EMSGSIZE - The message to was too large.
+ * - ENOMEM - Buffers could not be allocated for the command.
+ */
+#define IPMICTL_SEND_COMMAND_SETTIME _IOR(IPMI_IOC_MAGIC, 21, \
+ struct ipmi_req_settime)
+
+/* Messages received from the interface are this format. */
+struct ipmi_recv
+{
+ int recv_type; /* Is this a command, response or an
+ asyncronous event. */
+
+ unsigned char __user *addr; /* Address the message was from is put
+ here. The caller must supply the
+ memory. */
+ unsigned int addr_len; /* The size of the address buffer.
+ The caller supplies the full buffer
+ length, this value is updated to
+ the actual message length when the
+ message is received. */
+
+ long msgid; /* The sequence number specified in the request
+ if this is a response. If this is a command,
+ this will be the sequence number from the
+ command. */
+
+ struct ipmi_msg msg; /* The data field must point to a buffer.
+ The data_size field must be set to the
+ size of the message buffer. The
+ caller supplies the full buffer
+ length, this value is updated to the
+ actual message length when the message
+ is received. */
+};
+
+/*
+ * Receive a message. error values:
+ * - EAGAIN - no messages in the queue.
+ * - EFAULT - an address supplied was invalid.
+ * - EINVAL - The address supplied was not valid.
+ * - EMSGSIZE - The message to was too large to fit into the message buffer,
+ * the message will be left in the buffer. */
+#define IPMICTL_RECEIVE_MSG _IOWR(IPMI_IOC_MAGIC, 12, \
+ struct ipmi_recv)
+
+/*
+ * Like RECEIVE_MSG, but if the message won't fit in the buffer, it
+ * will truncate the contents instead of leaving the data in the
+ * buffer.
+ */
+#define IPMICTL_RECEIVE_MSG_TRUNC _IOWR(IPMI_IOC_MAGIC, 11, \
+ struct ipmi_recv)
+
+/* Register to get commands from other entities on this interface. */
+struct ipmi_cmdspec
+{
+ unsigned char netfn;
+ unsigned char cmd;
+};
+
+/*
+ * Register to receive a specific command. error values:
+ * - EFAULT - an address supplied was invalid.
+ * - EBUSY - The netfn/cmd supplied was already in use.
+ * - ENOMEM - could not allocate memory for the entry.
+ */
+#define IPMICTL_REGISTER_FOR_CMD _IOR(IPMI_IOC_MAGIC, 14, \
+ struct ipmi_cmdspec)
+/*
+ * Unregister a regsitered command. error values:
+ * - EFAULT - an address supplied was invalid.
+ * - ENOENT - The netfn/cmd was not found registered for this user.
+ */
+#define IPMICTL_UNREGISTER_FOR_CMD _IOR(IPMI_IOC_MAGIC, 15, \
+ struct ipmi_cmdspec)
+
+/*
+ * Set whether this interface receives events. Note that the first
+ * user registered for events will get all pending events for the
+ * interface. error values:
+ * - EFAULT - an address supplied was invalid.
+ */
+#define IPMICTL_SET_GETS_EVENTS_CMD _IOR(IPMI_IOC_MAGIC, 16, int)
+
+/*
+ * Set and get the slave address and LUN that we will use for our
+ * source messages. Note that this affects the interface, not just
+ * this user, so it will affect all users of this interface. This is
+ * so some initialization code can come in and do the OEM-specific
+ * things it takes to determine your address (if not the BMC) and set
+ * it for everyone else. You should probably leave the LUN alone.
+ */
+#define IPMICTL_SET_MY_ADDRESS_CMD _IOR(IPMI_IOC_MAGIC, 17, unsigned int)
+#define IPMICTL_GET_MY_ADDRESS_CMD _IOR(IPMI_IOC_MAGIC, 18, unsigned int)
+#define IPMICTL_SET_MY_LUN_CMD _IOR(IPMI_IOC_MAGIC, 19, unsigned int)
+#define IPMICTL_GET_MY_LUN_CMD _IOR(IPMI_IOC_MAGIC, 20, unsigned int)
+
+/*
+ * Get/set the default timing values for an interface. You shouldn't
+ * generally mess with these.
+ */
+struct ipmi_timing_parms
+{
+ int retries;
+ unsigned int retry_time_ms;
+};
+#define IPMICTL_SET_TIMING_PARMS_CMD _IOR(IPMI_IOC_MAGIC, 22, \
+ struct ipmi_timing_parms)
+#define IPMICTL_GET_TIMING_PARMS_CMD _IOR(IPMI_IOC_MAGIC, 23, \
+ struct ipmi_timing_parms)
+
+#endif /* __LINUX_IPMI_H */