1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3  * ipmi.h
4  *
5  * MontaVista IPMI interface
6  *
7  * Author: MontaVista Software, Inc.
8  *         Corey Minyard <minyard@mvista.com>
9  *         source@mvista.com
10  *
11  * Copyright 2002 MontaVista Software Inc.
12  *
13  */
14 
15 #ifndef _UAPI__LINUX_IPMI_H
16 #define _UAPI__LINUX_IPMI_H
17 
18 #include <linux/ipmi_msgdefs.h>
19 #include <linux/compiler.h>
20 
21 /*
22  * This file describes an interface to an IPMI driver.  You have to
23  * have a fairly good understanding of IPMI to use this, so go read
24  * the specs first before actually trying to do anything.
25  *
26  * With that said, this driver provides a multi-user interface to the
27  * IPMI driver, and it allows multiple IPMI physical interfaces below
28  * the driver.  The physical interfaces bind as a lower layer on the
29  * driver.  They appear as interfaces to the application using this
30  * interface.
31  *
32  * Multi-user means that multiple applications may use the driver,
33  * send commands, receive responses, etc.  The driver keeps track of
34  * commands the user sends and tracks the responses.  The responses
35  * will go back to the application that send the command.  If the
36  * response doesn't come back in time, the driver will return a
37  * timeout error response to the application.  Asynchronous events
38  * from the BMC event queue will go to all users bound to the driver.
39  * The incoming event queue in the BMC will automatically be flushed
40  * if it becomes full and it is queried once a second to see if
41  * anything is in it.  Incoming commands to the driver will get
42  * delivered as commands.
43  */
44 
45 /*
46  * This is an overlay for all the address types, so it's easy to
47  * determine the actual address type.  This is kind of like addresses
48  * work for sockets.
49  */
50 #define IPMI_MAX_ADDR_SIZE 32
51 struct ipmi_addr {
52 	 /* Try to take these from the "Channel Medium Type" table
53 	    in section 6.5 of the IPMI 1.5 manual. */
54 	int   addr_type;
55 	short channel;
56 	char  data[IPMI_MAX_ADDR_SIZE];
57 };
58 
59 /*
60  * When the address is not used, the type will be set to this value.
61  * The channel is the BMC's channel number for the channel (usually
62  * 0), or IPMC_BMC_CHANNEL if communicating directly with the BMC.
63  */
64 #define IPMI_SYSTEM_INTERFACE_ADDR_TYPE	0x0c
65 struct ipmi_system_interface_addr {
66 	int           addr_type;
67 	short         channel;
68 	unsigned char lun;
69 };
70 
71 /* An IPMB Address. */
72 #define IPMI_IPMB_ADDR_TYPE		0x01
73 /* Used for broadcast get device id as described in section 17.9 of the
74    IPMI 1.5 manual. */
75 #define IPMI_IPMB_BROADCAST_ADDR_TYPE	0x41
76 struct ipmi_ipmb_addr {
77 	int           addr_type;
78 	short         channel;
79 	unsigned char slave_addr;
80 	unsigned char lun;
81 };
82 
83 /*
84  * Used for messages received directly from an IPMB that have not gone
85  * through a MC.  This is for systems that sit right on an IPMB so
86  * they can receive commands and respond to them.
87  */
88 #define IPMI_IPMB_DIRECT_ADDR_TYPE	0x81
89 struct ipmi_ipmb_direct_addr {
90 	int           addr_type;
91 	short         channel;
92 	unsigned char slave_addr;
93 	unsigned char rs_lun;
94 	unsigned char rq_lun;
95 };
96 
97 /*
98  * A LAN Address.  This is an address to/from a LAN interface bridged
99  * by the BMC, not an address actually out on the LAN.
100  *
101  * A conscious decision was made here to deviate slightly from the IPMI
102  * spec.  We do not use rqSWID and rsSWID like it shows in the
103  * message.  Instead, we use remote_SWID and local_SWID.  This means
104  * that any message (a request or response) from another device will
105  * always have exactly the same address.  If you didn't do this,
106  * requests and responses from the same device would have different
107  * addresses, and that's not too cool.
108  *
109  * In this address, the remote_SWID is always the SWID the remote
110  * message came from, or the SWID we are sending the message to.
111  * local_SWID is always our SWID.  Note that having our SWID in the
112  * message is a little weird, but this is required.
113  */
114 #define IPMI_LAN_ADDR_TYPE		0x04
115 struct ipmi_lan_addr {
116 	int           addr_type;
117 	short         channel;
118 	unsigned char privilege;
119 	unsigned char session_handle;
120 	unsigned char remote_SWID;
121 	unsigned char local_SWID;
122 	unsigned char lun;
123 };
124 
125 
126 /*
127  * Channel for talking directly with the BMC.  When using this
128  * channel, This is for the system interface address type only.  FIXME
129  * - is this right, or should we use -1?
130  */
131 #define IPMI_BMC_CHANNEL  0xf
132 #define IPMI_NUM_CHANNELS 0x10
133 
134 /*
135  * Used to signify an "all channel" bitmask.  This is more than the
136  * actual number of channels because this is used in userland and
137  * will cover us if the number of channels is extended.
138  */
139 #define IPMI_CHAN_ALL     (~0)
140 
141 
142 /*
143  * A raw IPMI message without any addressing.  This covers both
144  * commands and responses.  The completion code is always the first
145  * byte of data in the response (as the spec shows the messages laid
146  * out).
147  */
148 struct ipmi_msg {
149 	unsigned char  netfn;
150 	unsigned char  cmd;
151 	unsigned short data_len;
152 	unsigned char  __user *data;
153 };
154 
155 struct kernel_ipmi_msg {
156 	unsigned char  netfn;
157 	unsigned char  cmd;
158 	unsigned short data_len;
159 	unsigned char  *data;
160 };
161 
162 /*
163  * Various defines that are useful for IPMI applications.
164  */
165 #define IPMI_INVALID_CMD_COMPLETION_CODE	0xC1
166 #define IPMI_TIMEOUT_COMPLETION_CODE		0xC3
167 #define IPMI_UNKNOWN_ERR_COMPLETION_CODE	0xff
168 
169 
170 /*
171  * Receive types for messages coming from the receive interface.  This
172  * is used for the receive in-kernel interface and in the receive
173  * IOCTL.
174  *
175  * The "IPMI_RESPONSE_RESPONSE_TYPE" is a little strange sounding, but
176  * it allows you to get the message results when you send a response
177  * message.
178  */
179 #define IPMI_RESPONSE_RECV_TYPE		1 /* A response to a command */
180 #define IPMI_ASYNC_EVENT_RECV_TYPE	2 /* Something from the event queue */
181 #define IPMI_CMD_RECV_TYPE		3 /* A command from somewhere else */
182 #define IPMI_RESPONSE_RESPONSE_TYPE	4 /* The response for
183 					      a sent response, giving any
184 					      error status for sending the
185 					      response.  When you send a
186 					      response message, this will
187 					      be returned. */
188 #define IPMI_OEM_RECV_TYPE		5 /* The response for OEM Channels */
189 
190 /* Note that async events and received commands do not have a completion
191    code as the first byte of the incoming data, unlike a response. */
192 
193 
194 /*
195  * Modes for ipmi_set_maint_mode() and the userland IOCTL.  The AUTO
196  * setting is the default and means it will be set on certain
197  * commands.  Hard setting it on and off will override automatic
198  * operation.
199  */
200 #define IPMI_MAINTENANCE_MODE_AUTO	0
201 #define IPMI_MAINTENANCE_MODE_OFF	1
202 #define IPMI_MAINTENANCE_MODE_ON	2
203 
204 
205 
206 /*
207  * The userland interface
208  */
209 
210 /*
211  * The userland interface for the IPMI driver is a standard character
212  * device, with each instance of an interface registered as a minor
213  * number under the major character device.
214  *
215  * The read and write calls do not work, to get messages in and out
216  * requires ioctl calls because of the complexity of the data.  select
217  * and poll do work, so you can wait for input using the file
218  * descriptor, you just can use read to get it.
219  *
220  * In general, you send a command down to the interface and receive
221  * responses back.  You can use the msgid value to correlate commands
222  * and responses, the driver will take care of figuring out which
223  * incoming messages are for which command and find the proper msgid
224  * value to report.  You will only receive reponses for commands you
225  * send.  Asynchronous events, however, go to all open users, so you
226  * must be ready to handle these (or ignore them if you don't care).
227  *
228  * The address type depends upon the channel type.  When talking
229  * directly to the BMC (IPMC_BMC_CHANNEL), the address is ignored
230  * (IPMI_UNUSED_ADDR_TYPE).  When talking to an IPMB channel, you must
231  * supply a valid IPMB address with the addr_type set properly.
232  *
233  * When talking to normal channels, the driver takes care of the
234  * details of formatting and sending messages on that channel.  You do
235  * not, for instance, have to format a send command, you just send
236  * whatever command you want to the channel, the driver will create
237  * the send command, automatically issue receive command and get even
238  * commands, and pass those up to the proper user.
239  */
240 
241 
242 /* The magic IOCTL value for this interface. */
243 #define IPMI_IOC_MAGIC 'i'
244 
245 
246 /* Messages sent to the interface are this format. */
247 struct ipmi_req {
248 	unsigned char __user *addr; /* Address to send the message to. */
249 	unsigned int  addr_len;
250 
251 	long    msgid; /* The sequence number for the message.  This
252 			  exact value will be reported back in the
253 			  response to this request if it is a command.
254 			  If it is a response, this will be used as
255 			  the sequence value for the response.  */
256 
257 	struct ipmi_msg msg;
258 };
259 /*
260  * Send a message to the interfaces.  error values are:
261  *   - EFAULT - an address supplied was invalid.
262  *   - EINVAL - The address supplied was not valid, or the command
263  *              was not allowed.
264  *   - EMSGSIZE - The message to was too large.
265  *   - ENOMEM - Buffers could not be allocated for the command.
266  */
267 #define IPMICTL_SEND_COMMAND		_IOR(IPMI_IOC_MAGIC, 13,	\
268 					     struct ipmi_req)
269 
270 /* Messages sent to the interface with timing parameters are this
271    format. */
272 struct ipmi_req_settime {
273 	struct ipmi_req req;
274 
275 	/* See ipmi_request_settime() above for details on these
276 	   values. */
277 	int          retries;
278 	unsigned int retry_time_ms;
279 };
280 /*
281  * Send a message to the interfaces with timing parameters.  error values
282  * are:
283  *   - EFAULT - an address supplied was invalid.
284  *   - EINVAL - The address supplied was not valid, or the command
285  *              was not allowed.
286  *   - EMSGSIZE - The message to was too large.
287  *   - ENOMEM - Buffers could not be allocated for the command.
288  */
289 #define IPMICTL_SEND_COMMAND_SETTIME	_IOR(IPMI_IOC_MAGIC, 21,	\
290 					     struct ipmi_req_settime)
291 
292 /* Messages received from the interface are this format. */
293 struct ipmi_recv {
294 	int     recv_type; /* Is this a command, response or an
295 			      asyncronous event. */
296 
297 	unsigned char __user *addr;    /* Address the message was from is put
298 				   here.  The caller must supply the
299 				   memory. */
300 	unsigned int  addr_len; /* The size of the address buffer.
301 				   The caller supplies the full buffer
302 				   length, this value is updated to
303 				   the actual message length when the
304 				   message is received. */
305 
306 	long    msgid; /* The sequence number specified in the request
307 			  if this is a response.  If this is a command,
308 			  this will be the sequence number from the
309 			  command. */
310 
311 	struct ipmi_msg msg; /* The data field must point to a buffer.
312 				The data_size field must be set to the
313 				size of the message buffer.  The
314 				caller supplies the full buffer
315 				length, this value is updated to the
316 				actual message length when the message
317 				is received. */
318 };
319 
320 /*
321  * Receive a message.  error values:
322  *  - EAGAIN - no messages in the queue.
323  *  - EFAULT - an address supplied was invalid.
324  *  - EINVAL - The address supplied was not valid.
325  *  - EMSGSIZE - The message to was too large to fit into the message buffer,
326  *               the message will be left in the buffer. */
327 #define IPMICTL_RECEIVE_MSG		_IOWR(IPMI_IOC_MAGIC, 12,	\
328 					      struct ipmi_recv)
329 
330 /*
331  * Like RECEIVE_MSG, but if the message won't fit in the buffer, it
332  * will truncate the contents instead of leaving the data in the
333  * buffer.
334  */
335 #define IPMICTL_RECEIVE_MSG_TRUNC	_IOWR(IPMI_IOC_MAGIC, 11,	\
336 					      struct ipmi_recv)
337 
338 /* Register to get commands from other entities on this interface. */
339 struct ipmi_cmdspec {
340 	unsigned char netfn;
341 	unsigned char cmd;
342 };
343 
344 /*
345  * Register to receive a specific command.  error values:
346  *   - EFAULT - an address supplied was invalid.
347  *   - EBUSY - The netfn/cmd supplied was already in use.
348  *   - ENOMEM - could not allocate memory for the entry.
349  */
350 #define IPMICTL_REGISTER_FOR_CMD	_IOR(IPMI_IOC_MAGIC, 14,	\
351 					     struct ipmi_cmdspec)
352 /*
353  * Unregister a registered command.  error values:
354  *  - EFAULT - an address supplied was invalid.
355  *  - ENOENT - The netfn/cmd was not found registered for this user.
356  */
357 #define IPMICTL_UNREGISTER_FOR_CMD	_IOR(IPMI_IOC_MAGIC, 15,	\
358 					     struct ipmi_cmdspec)
359 
360 /*
361  * Register to get commands from other entities on specific channels.
362  * This way, you can only listen on specific channels, or have messages
363  * from some channels go to one place and other channels to someplace
364  * else.  The chans field is a bitmask, (1 << channel) for each channel.
365  * It may be IPMI_CHAN_ALL for all channels.
366  */
367 struct ipmi_cmdspec_chans {
368 	unsigned int netfn;
369 	unsigned int cmd;
370 	unsigned int chans;
371 };
372 
373 /*
374  * Register to receive a specific command on specific channels.  error values:
375  *   - EFAULT - an address supplied was invalid.
376  *   - EBUSY - One of the netfn/cmd/chans supplied was already in use.
377  *   - ENOMEM - could not allocate memory for the entry.
378  */
379 #define IPMICTL_REGISTER_FOR_CMD_CHANS	_IOR(IPMI_IOC_MAGIC, 28,	\
380 					     struct ipmi_cmdspec_chans)
381 /*
382  * Unregister some netfn/cmd/chans.  error values:
383  *  - EFAULT - an address supplied was invalid.
384  *  - ENOENT - None of the netfn/cmd/chans were found registered for this user.
385  */
386 #define IPMICTL_UNREGISTER_FOR_CMD_CHANS _IOR(IPMI_IOC_MAGIC, 29,	\
387 					     struct ipmi_cmdspec_chans)
388 
389 /*
390  * Set whether this interface receives events.  Note that the first
391  * user registered for events will get all pending events for the
392  * interface.  error values:
393  *  - EFAULT - an address supplied was invalid.
394  */
395 #define IPMICTL_SET_GETS_EVENTS_CMD	_IOR(IPMI_IOC_MAGIC, 16, int)
396 
397 /*
398  * Set and get the slave address and LUN that we will use for our
399  * source messages.  Note that this affects the interface, not just
400  * this user, so it will affect all users of this interface.  This is
401  * so some initialization code can come in and do the OEM-specific
402  * things it takes to determine your address (if not the BMC) and set
403  * it for everyone else.  You should probably leave the LUN alone.
404  */
405 struct ipmi_channel_lun_address_set {
406 	unsigned short channel;
407 	unsigned char  value;
408 };
409 #define IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD \
410 	_IOR(IPMI_IOC_MAGIC, 24, struct ipmi_channel_lun_address_set)
411 #define IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD \
412 	_IOR(IPMI_IOC_MAGIC, 25, struct ipmi_channel_lun_address_set)
413 #define IPMICTL_SET_MY_CHANNEL_LUN_CMD \
414 	_IOR(IPMI_IOC_MAGIC, 26, struct ipmi_channel_lun_address_set)
415 #define IPMICTL_GET_MY_CHANNEL_LUN_CMD \
416 	_IOR(IPMI_IOC_MAGIC, 27, struct ipmi_channel_lun_address_set)
417 /* Legacy interfaces, these only set IPMB 0. */
418 #define IPMICTL_SET_MY_ADDRESS_CMD	_IOR(IPMI_IOC_MAGIC, 17, unsigned int)
419 #define IPMICTL_GET_MY_ADDRESS_CMD	_IOR(IPMI_IOC_MAGIC, 18, unsigned int)
420 #define IPMICTL_SET_MY_LUN_CMD		_IOR(IPMI_IOC_MAGIC, 19, unsigned int)
421 #define IPMICTL_GET_MY_LUN_CMD		_IOR(IPMI_IOC_MAGIC, 20, unsigned int)
422 
423 /*
424  * Get/set the default timing values for an interface.  You shouldn't
425  * generally mess with these.
426  */
427 struct ipmi_timing_parms {
428 	int          retries;
429 	unsigned int retry_time_ms;
430 };
431 #define IPMICTL_SET_TIMING_PARMS_CMD	_IOR(IPMI_IOC_MAGIC, 22, \
432 					     struct ipmi_timing_parms)
433 #define IPMICTL_GET_TIMING_PARMS_CMD	_IOR(IPMI_IOC_MAGIC, 23, \
434 					     struct ipmi_timing_parms)
435 
436 /*
437  * Set the maintenance mode.  See ipmi_set_maintenance_mode() above
438  * for a description of what this does.
439  */
440 #define IPMICTL_GET_MAINTENANCE_MODE_CMD	_IOR(IPMI_IOC_MAGIC, 30, int)
441 #define IPMICTL_SET_MAINTENANCE_MODE_CMD	_IOW(IPMI_IOC_MAGIC, 31, int)
442 
443 #endif /* _UAPI__LINUX_IPMI_H */
444