1 /* SPDX-License-Identifier: GPL-2.0+ */
5 * MontaVista IPMI system management interface
7 * Author: MontaVista Software, Inc.
8 * Corey Minyard <minyard@mvista.com>
11 * Copyright 2002 MontaVista Software Inc.
15 #ifndef __LINUX_IPMI_SMI_H
16 #define __LINUX_IPMI_SMI_H
18 #include <linux/ipmi_msgdefs.h>
19 #include <linux/proc_fs.h>
20 #include <linux/platform_device.h>
21 #include <linux/ipmi.h>
26 * This files describes the interface for IPMI system management interface
27 * drivers to bind into the IPMI message handler.
30 /* Structure for the low-level drivers. */
31 typedef struct ipmi_smi *ipmi_smi_t;
34 * Flags for set_check_watch() below. Tells if the SMI should be
35 * waiting for watchdog timeouts, commands and/or messages. There is
36 * also an internal flag for the message handler, SMIs should ignore
39 #define IPMI_WATCH_MASK_INTERNAL (1 << 0)
40 #define IPMI_WATCH_MASK_CHECK_MESSAGES (1 << 1)
41 #define IPMI_WATCH_MASK_CHECK_WATCHDOG (1 << 2)
42 #define IPMI_WATCH_MASK_CHECK_COMMANDS (1 << 3)
45 * Messages to/from the lower layer. The smi interface will take one
46 * of these to send. After the send has occurred and a response has
47 * been received, it will report this same data structure back up to
48 * the upper layer. If an error occurs, it should fill in the
49 * response with an error code in the completion code location. When
50 * asynchronous data is received, one of these is allocated, the
51 * data_size is set to zero and the response holds the data from the
52 * get message or get event command that the interface initiated.
53 * Note that it is the interfaces responsibility to detect
54 * asynchronous data and messages and request them from the
58 struct list_head link;
64 unsigned char data[IPMI_MAX_MSG_LENGTH];
67 unsigned char rsp[IPMI_MAX_MSG_LENGTH];
70 * There should be a response message coming back in the BMC
76 * Will be called when the system is done with the message
77 * (presumably to free it).
79 void (*done)(struct ipmi_smi_msg *msg);
82 struct ipmi_smi_handlers {
86 * The low-level interface cannot start sending messages to
87 * the upper layer until this function is called. This may
88 * not be NULL, the lower layer must take the interface from
91 int (*start_processing)(void *send_info,
92 struct ipmi_smi *new_intf);
95 * When called, the low-level interface should disable all
96 * processing, it should be complete shut down when it returns.
98 void (*shutdown)(void *send_info);
101 * Get the detailed private info of the low level interface and store
102 * it into the structure of ipmi_smi_data. For example: the
103 * ACPI device handle will be returned for the pnp_acpi IPMI device.
105 int (*get_smi_info)(void *send_info, struct ipmi_smi_info *data);
108 * Called to enqueue an SMI message to be sent. This
109 * operation is not allowed to fail. If an error occurs, it
110 * should report back the error in a received message. It may
111 * do this in the current call context, since no write locks
112 * are held when this is run. Message are delivered one at
113 * a time by the message handler, a new message will not be
114 * delivered until the previous message is returned.
116 void (*sender)(void *send_info,
117 struct ipmi_smi_msg *msg);
120 * Called by the upper layer to request that we try to get
121 * events from the BMC we are attached to.
123 void (*request_events)(void *send_info);
126 * Called by the upper layer when some user requires that the
127 * interface watch for received messages and watchdog
128 * pretimeouts (basically do a "Get Flags", or not. Used by
129 * the SMI to know if it should watch for these. This may be
130 * NULL if the SMI does not implement it. watch_mask is from
131 * IPMI_WATCH_MASK_xxx above. The interface should run slower
132 * timeouts for just watchdog checking or faster timeouts when
133 * waiting for the message queue.
135 void (*set_need_watch)(void *send_info, unsigned int watch_mask);
138 * Called when flushing all pending messages.
140 void (*flush_messages)(void *send_info);
143 * Called when the interface should go into "run to
144 * completion" mode. If this call sets the value to true, the
145 * interface should make sure that all messages are flushed
146 * out and that none are pending, and any new requests are run
147 * to completion immediately.
149 void (*set_run_to_completion)(void *send_info, bool run_to_completion);
152 * Called to poll for work to do. This is so upper layers can
153 * poll for operations during things like crash dumps.
155 void (*poll)(void *send_info);
158 * Enable/disable firmware maintenance mode. Note that this
159 * is *not* the modes defined, this is simply an on/off
160 * setting. The message handler does the mode handling. Note
161 * that this is called from interrupt context, so it cannot
164 void (*set_maintenance_mode)(void *send_info, bool enable);
167 struct ipmi_device_id {
168 unsigned char device_id;
169 unsigned char device_revision;
170 unsigned char firmware_revision_1;
171 unsigned char firmware_revision_2;
172 unsigned char ipmi_version;
173 unsigned char additional_device_support;
174 unsigned int manufacturer_id;
175 unsigned int product_id;
176 unsigned char aux_firmware_revision[4];
177 unsigned int aux_firmware_revision_set : 1;
180 #define ipmi_version_major(v) ((v)->ipmi_version & 0xf)
181 #define ipmi_version_minor(v) ((v)->ipmi_version >> 4)
184 * Take a pointer to an IPMI response and extract device id information from
185 * it. @netfn is in the IPMI_NETFN_ format, so may need to be shifted from
188 static inline int ipmi_demangle_device_id(uint8_t netfn, uint8_t cmd,
189 const unsigned char *data,
190 unsigned int data_len,
191 struct ipmi_device_id *id)
195 if (netfn != IPMI_NETFN_APP_RESPONSE || cmd != IPMI_GET_DEVICE_ID_CMD)
196 /* Strange, didn't get the response we expected. */
199 /* That's odd, it shouldn't be able to fail. */
205 id->device_id = data[0];
206 id->device_revision = data[1];
207 id->firmware_revision_1 = data[2];
208 id->firmware_revision_2 = data[3];
209 id->ipmi_version = data[4];
210 id->additional_device_support = data[5];
211 if (data_len >= 11) {
212 id->manufacturer_id = (data[6] | (data[7] << 8) |
214 id->product_id = data[9] | (data[10] << 8);
216 id->manufacturer_id = 0;
219 if (data_len >= 15) {
220 memcpy(id->aux_firmware_revision, data+11, 4);
221 id->aux_firmware_revision_set = 1;
223 id->aux_firmware_revision_set = 0;
229 * Add a low-level interface to the IPMI driver. Note that if the
230 * interface doesn't know its slave address, it should pass in zero.
231 * The low-level interface should not deliver any messages to the
232 * upper layer until the start_processing() function in the handlers
233 * is called, and the lower layer must get the interface from that
236 int ipmi_add_smi(struct module *owner,
237 const struct ipmi_smi_handlers *handlers,
240 unsigned char slave_addr);
242 #define ipmi_register_smi(handlers, send_info, dev, slave_addr) \
243 ipmi_add_smi(THIS_MODULE, handlers, send_info, dev, slave_addr)
246 * Remove a low-level interface from the IPMI driver. This will
247 * return an error if the interface is still in use by a user.
249 void ipmi_unregister_smi(struct ipmi_smi *intf);
252 * The lower layer reports received messages through this interface.
253 * The data_size should be zero if this is an asynchronous message. If
254 * the lower layer gets an error sending a message, it should format
255 * an error response in the message response.
257 void ipmi_smi_msg_received(struct ipmi_smi *intf,
258 struct ipmi_smi_msg *msg);
260 /* The lower layer received a watchdog pre-timeout on interface. */
261 void ipmi_smi_watchdog_pretimeout(struct ipmi_smi *intf);
263 struct ipmi_smi_msg *ipmi_alloc_smi_msg(void);
264 static inline void ipmi_free_smi_msg(struct ipmi_smi_msg *msg)
269 #endif /* __LINUX_IPMI_SMI_H */