]>
Commit | Line | Data |
---|---|---|
e92b297c ZY |
1 | /* |
2 | * acpi_ipmi.c - ACPI IPMI opregion | |
3 | * | |
4 | * Copyright (C) 2010 Intel Corporation | |
5 | * Copyright (C) 2010 Zhao Yakui <yakui.zhao@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
22 | * | |
23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/proc_fs.h> | |
32 | #include <linux/seq_file.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/list.h> | |
35 | #include <linux/spinlock.h> | |
36 | #include <linux/io.h> | |
37 | #include <acpi/acpi_bus.h> | |
38 | #include <acpi/acpi_drivers.h> | |
39 | #include <linux/ipmi.h> | |
40 | #include <linux/device.h> | |
41 | #include <linux/pnp.h> | |
06a8566b | 42 | #include <linux/spinlock.h> |
e92b297c ZY |
43 | |
44 | MODULE_AUTHOR("Zhao Yakui"); | |
45 | MODULE_DESCRIPTION("ACPI IPMI Opregion driver"); | |
46 | MODULE_LICENSE("GPL"); | |
47 | ||
48 | #define IPMI_FLAGS_HANDLER_INSTALL 0 | |
49 | ||
50 | #define ACPI_IPMI_OK 0 | |
51 | #define ACPI_IPMI_TIMEOUT 0x10 | |
52 | #define ACPI_IPMI_UNKNOWN 0x07 | |
53 | /* the IPMI timeout is 5s */ | |
8584ec6a | 54 | #define IPMI_TIMEOUT (5000) |
6b68f03f | 55 | #define ACPI_IPMI_MAX_MSG_LENGTH 64 |
e92b297c ZY |
56 | |
57 | struct acpi_ipmi_device { | |
58 | /* the device list attached to driver_data.ipmi_devices */ | |
59 | struct list_head head; | |
60 | /* the IPMI request message list */ | |
61 | struct list_head tx_msg_list; | |
06a8566b | 62 | spinlock_t tx_msg_lock; |
e92b297c ZY |
63 | acpi_handle handle; |
64 | struct pnp_dev *pnp_dev; | |
65 | ipmi_user_t user_interface; | |
66 | int ipmi_ifnum; /* IPMI interface number */ | |
67 | long curr_msgid; | |
68 | unsigned long flags; | |
69 | struct ipmi_smi_info smi_data; | |
70 | }; | |
71 | ||
72 | struct ipmi_driver_data { | |
73 | struct list_head ipmi_devices; | |
74 | struct ipmi_smi_watcher bmc_events; | |
75 | struct ipmi_user_hndl ipmi_hndlrs; | |
76 | struct mutex ipmi_lock; | |
77 | }; | |
78 | ||
79 | struct acpi_ipmi_msg { | |
80 | struct list_head head; | |
81 | /* | |
82 | * General speaking the addr type should be SI_ADDR_TYPE. And | |
83 | * the addr channel should be BMC. | |
84 | * In fact it can also be IPMB type. But we will have to | |
85 | * parse it from the Netfn command buffer. It is so complex | |
86 | * that it is skipped. | |
87 | */ | |
88 | struct ipmi_addr addr; | |
89 | long tx_msgid; | |
90 | /* it is used to track whether the IPMI message is finished */ | |
91 | struct completion tx_complete; | |
92 | struct kernel_ipmi_msg tx_message; | |
93 | int msg_done; | |
6b68f03f LZ |
94 | /* tx/rx data . And copy it from/to ACPI object buffer */ |
95 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; | |
96 | u8 rx_len; | |
e92b297c ZY |
97 | struct acpi_ipmi_device *device; |
98 | }; | |
99 | ||
100 | /* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */ | |
101 | struct acpi_ipmi_buffer { | |
102 | u8 status; | |
103 | u8 length; | |
6b68f03f | 104 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
e92b297c ZY |
105 | }; |
106 | ||
107 | static void ipmi_register_bmc(int iface, struct device *dev); | |
108 | static void ipmi_bmc_gone(int iface); | |
109 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); | |
110 | static void acpi_add_ipmi_device(struct acpi_ipmi_device *ipmi_device); | |
111 | static void acpi_remove_ipmi_device(struct acpi_ipmi_device *ipmi_device); | |
112 | ||
113 | static struct ipmi_driver_data driver_data = { | |
114 | .ipmi_devices = LIST_HEAD_INIT(driver_data.ipmi_devices), | |
115 | .bmc_events = { | |
116 | .owner = THIS_MODULE, | |
117 | .new_smi = ipmi_register_bmc, | |
118 | .smi_gone = ipmi_bmc_gone, | |
119 | }, | |
120 | .ipmi_hndlrs = { | |
121 | .ipmi_recv_hndl = ipmi_msg_handler, | |
122 | }, | |
123 | }; | |
124 | ||
125 | static struct acpi_ipmi_msg *acpi_alloc_ipmi_msg(struct acpi_ipmi_device *ipmi) | |
126 | { | |
127 | struct acpi_ipmi_msg *ipmi_msg; | |
128 | struct pnp_dev *pnp_dev = ipmi->pnp_dev; | |
129 | ||
130 | ipmi_msg = kzalloc(sizeof(struct acpi_ipmi_msg), GFP_KERNEL); | |
131 | if (!ipmi_msg) { | |
132 | dev_warn(&pnp_dev->dev, "Can't allocate memory for ipmi_msg\n"); | |
133 | return NULL; | |
134 | } | |
135 | init_completion(&ipmi_msg->tx_complete); | |
136 | INIT_LIST_HEAD(&ipmi_msg->head); | |
137 | ipmi_msg->device = ipmi; | |
8584ec6a | 138 | ipmi_msg->msg_done = ACPI_IPMI_UNKNOWN; |
e92b297c ZY |
139 | return ipmi_msg; |
140 | } | |
141 | ||
142 | #define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff) | |
143 | #define IPMI_OP_RGN_CMD(offset) (offset & 0xff) | |
6b68f03f | 144 | static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg, |
e92b297c ZY |
145 | acpi_physical_address address, |
146 | acpi_integer *value) | |
147 | { | |
148 | struct kernel_ipmi_msg *msg; | |
149 | struct acpi_ipmi_buffer *buffer; | |
150 | struct acpi_ipmi_device *device; | |
06a8566b | 151 | unsigned long flags; |
e92b297c ZY |
152 | |
153 | msg = &tx_msg->tx_message; | |
154 | /* | |
155 | * IPMI network function and command are encoded in the address | |
156 | * within the IPMI OpRegion; see ACPI 4.0, sec 5.5.2.4.3. | |
157 | */ | |
158 | msg->netfn = IPMI_OP_RGN_NETFN(address); | |
159 | msg->cmd = IPMI_OP_RGN_CMD(address); | |
6b68f03f | 160 | msg->data = tx_msg->data; |
e92b297c ZY |
161 | /* |
162 | * value is the parameter passed by the IPMI opregion space handler. | |
163 | * It points to the IPMI request message buffer | |
164 | */ | |
165 | buffer = (struct acpi_ipmi_buffer *)value; | |
166 | /* copy the tx message data */ | |
6b68f03f LZ |
167 | if (buffer->length > ACPI_IPMI_MAX_MSG_LENGTH) { |
168 | dev_WARN_ONCE(&tx_msg->device->pnp_dev->dev, true, | |
169 | "Unexpected request (msg len %d).\n", | |
170 | buffer->length); | |
171 | return -EINVAL; | |
172 | } | |
e92b297c | 173 | msg->data_len = buffer->length; |
6b68f03f | 174 | memcpy(tx_msg->data, buffer->data, msg->data_len); |
e92b297c ZY |
175 | /* |
176 | * now the default type is SYSTEM_INTERFACE and channel type is BMC. | |
177 | * If the netfn is APP_REQUEST and the cmd is SEND_MESSAGE, | |
178 | * the addr type should be changed to IPMB. Then we will have to parse | |
179 | * the IPMI request message buffer to get the IPMB address. | |
180 | * If so, please fix me. | |
181 | */ | |
182 | tx_msg->addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
183 | tx_msg->addr.channel = IPMI_BMC_CHANNEL; | |
184 | tx_msg->addr.data[0] = 0; | |
185 | ||
186 | /* Get the msgid */ | |
187 | device = tx_msg->device; | |
06a8566b | 188 | spin_lock_irqsave(&device->tx_msg_lock, flags); |
e92b297c ZY |
189 | device->curr_msgid++; |
190 | tx_msg->tx_msgid = device->curr_msgid; | |
06a8566b | 191 | spin_unlock_irqrestore(&device->tx_msg_lock, flags); |
6b68f03f | 192 | return 0; |
e92b297c ZY |
193 | } |
194 | ||
195 | static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg, | |
8584ec6a | 196 | acpi_integer *value) |
e92b297c ZY |
197 | { |
198 | struct acpi_ipmi_buffer *buffer; | |
199 | ||
200 | /* | |
201 | * value is also used as output parameter. It represents the response | |
202 | * IPMI message returned by IPMI command. | |
203 | */ | |
204 | buffer = (struct acpi_ipmi_buffer *)value; | |
e92b297c | 205 | /* |
8584ec6a LZ |
206 | * If the flag of msg_done is not set, it means that the IPMI command is |
207 | * not executed correctly. | |
e92b297c | 208 | */ |
8584ec6a LZ |
209 | buffer->status = msg->msg_done; |
210 | if (msg->msg_done != ACPI_IPMI_OK) | |
e92b297c | 211 | return; |
e92b297c ZY |
212 | /* |
213 | * If the IPMI response message is obtained correctly, the status code | |
214 | * will be ACPI_IPMI_OK | |
215 | */ | |
e92b297c | 216 | buffer->length = msg->rx_len; |
6b68f03f | 217 | memcpy(buffer->data, msg->data, msg->rx_len); |
e92b297c ZY |
218 | } |
219 | ||
220 | static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi) | |
221 | { | |
222 | struct acpi_ipmi_msg *tx_msg, *temp; | |
223 | int count = HZ / 10; | |
224 | struct pnp_dev *pnp_dev = ipmi->pnp_dev; | |
5ac557ef | 225 | unsigned long flags; |
e92b297c | 226 | |
5ac557ef | 227 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
e92b297c ZY |
228 | list_for_each_entry_safe(tx_msg, temp, &ipmi->tx_msg_list, head) { |
229 | /* wake up the sleep thread on the Tx msg */ | |
230 | complete(&tx_msg->tx_complete); | |
231 | } | |
5ac557ef | 232 | spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); |
e92b297c ZY |
233 | |
234 | /* wait for about 100ms to flush the tx message list */ | |
235 | while (count--) { | |
236 | if (list_empty(&ipmi->tx_msg_list)) | |
237 | break; | |
238 | schedule_timeout(1); | |
239 | } | |
240 | if (!list_empty(&ipmi->tx_msg_list)) | |
241 | dev_warn(&pnp_dev->dev, "tx msg list is not NULL\n"); | |
242 | } | |
243 | ||
244 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) | |
245 | { | |
246 | struct acpi_ipmi_device *ipmi_device = user_msg_data; | |
247 | int msg_found = 0; | |
248 | struct acpi_ipmi_msg *tx_msg; | |
249 | struct pnp_dev *pnp_dev = ipmi_device->pnp_dev; | |
06a8566b | 250 | unsigned long flags; |
e92b297c ZY |
251 | |
252 | if (msg->user != ipmi_device->user_interface) { | |
253 | dev_warn(&pnp_dev->dev, "Unexpected response is returned. " | |
254 | "returned user %p, expected user %p\n", | |
255 | msg->user, ipmi_device->user_interface); | |
6b68f03f | 256 | goto out_msg; |
e92b297c | 257 | } |
06a8566b | 258 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
e92b297c ZY |
259 | list_for_each_entry(tx_msg, &ipmi_device->tx_msg_list, head) { |
260 | if (msg->msgid == tx_msg->tx_msgid) { | |
261 | msg_found = 1; | |
262 | break; | |
263 | } | |
264 | } | |
265 | ||
e92b297c ZY |
266 | if (!msg_found) { |
267 | dev_warn(&pnp_dev->dev, "Unexpected response (msg id %ld) is " | |
268 | "returned.\n", msg->msgid); | |
5ac557ef | 269 | goto out_lock; |
e92b297c ZY |
270 | } |
271 | ||
6b68f03f LZ |
272 | /* copy the response data to Rx_data buffer */ |
273 | if (msg->msg.data_len > ACPI_IPMI_MAX_MSG_LENGTH) { | |
274 | dev_WARN_ONCE(&pnp_dev->dev, true, | |
275 | "Unexpected response (msg len %d).\n", | |
276 | msg->msg.data_len); | |
8584ec6a | 277 | goto out_comp; |
e92b297c | 278 | } |
8584ec6a LZ |
279 | /* response msg is an error msg */ |
280 | msg->recv_type = IPMI_RESPONSE_RECV_TYPE; | |
281 | if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE && | |
282 | msg->msg.data_len == 1) { | |
283 | if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) { | |
284 | dev_WARN_ONCE(&pnp_dev->dev, true, | |
285 | "Unexpected response (timeout).\n"); | |
286 | tx_msg->msg_done = ACPI_IPMI_TIMEOUT; | |
287 | } | |
288 | goto out_comp; | |
289 | } | |
290 | tx_msg->rx_len = msg->msg.data_len; | |
291 | memcpy(tx_msg->data, msg->msg.data, tx_msg->rx_len); | |
292 | tx_msg->msg_done = ACPI_IPMI_OK; | |
293 | out_comp: | |
e92b297c | 294 | complete(&tx_msg->tx_complete); |
5ac557ef LZ |
295 | out_lock: |
296 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); | |
6b68f03f | 297 | out_msg: |
e92b297c ZY |
298 | ipmi_free_recv_msg(msg); |
299 | }; | |
300 | ||
301 | static void ipmi_register_bmc(int iface, struct device *dev) | |
302 | { | |
303 | struct acpi_ipmi_device *ipmi_device, *temp; | |
304 | struct pnp_dev *pnp_dev; | |
305 | ipmi_user_t user; | |
306 | int err; | |
307 | struct ipmi_smi_info smi_data; | |
308 | acpi_handle handle; | |
309 | ||
310 | err = ipmi_get_smi_info(iface, &smi_data); | |
311 | ||
312 | if (err) | |
313 | return; | |
314 | ||
315 | if (smi_data.addr_src != SI_ACPI) { | |
316 | put_device(smi_data.dev); | |
317 | return; | |
318 | } | |
319 | ||
320 | handle = smi_data.addr_info.acpi_info.acpi_handle; | |
321 | ||
322 | mutex_lock(&driver_data.ipmi_lock); | |
323 | list_for_each_entry(temp, &driver_data.ipmi_devices, head) { | |
324 | /* | |
325 | * if the corresponding ACPI handle is already added | |
326 | * to the device list, don't add it again. | |
327 | */ | |
328 | if (temp->handle == handle) | |
329 | goto out; | |
330 | } | |
331 | ||
332 | ipmi_device = kzalloc(sizeof(*ipmi_device), GFP_KERNEL); | |
333 | ||
334 | if (!ipmi_device) | |
335 | goto out; | |
336 | ||
337 | pnp_dev = to_pnp_dev(smi_data.dev); | |
338 | ipmi_device->handle = handle; | |
339 | ipmi_device->pnp_dev = pnp_dev; | |
340 | ||
341 | err = ipmi_create_user(iface, &driver_data.ipmi_hndlrs, | |
342 | ipmi_device, &user); | |
343 | if (err) { | |
344 | dev_warn(&pnp_dev->dev, "Can't create IPMI user interface\n"); | |
345 | kfree(ipmi_device); | |
346 | goto out; | |
347 | } | |
348 | acpi_add_ipmi_device(ipmi_device); | |
349 | ipmi_device->user_interface = user; | |
350 | ipmi_device->ipmi_ifnum = iface; | |
351 | mutex_unlock(&driver_data.ipmi_lock); | |
352 | memcpy(&ipmi_device->smi_data, &smi_data, sizeof(struct ipmi_smi_info)); | |
353 | return; | |
354 | ||
355 | out: | |
356 | mutex_unlock(&driver_data.ipmi_lock); | |
357 | put_device(smi_data.dev); | |
358 | return; | |
359 | } | |
360 | ||
361 | static void ipmi_bmc_gone(int iface) | |
362 | { | |
363 | struct acpi_ipmi_device *ipmi_device, *temp; | |
364 | ||
365 | mutex_lock(&driver_data.ipmi_lock); | |
366 | list_for_each_entry_safe(ipmi_device, temp, | |
367 | &driver_data.ipmi_devices, head) { | |
368 | if (ipmi_device->ipmi_ifnum != iface) | |
369 | continue; | |
370 | ||
371 | acpi_remove_ipmi_device(ipmi_device); | |
372 | put_device(ipmi_device->smi_data.dev); | |
373 | kfree(ipmi_device); | |
374 | break; | |
375 | } | |
376 | mutex_unlock(&driver_data.ipmi_lock); | |
377 | } | |
378 | /* -------------------------------------------------------------------------- | |
379 | * Address Space Management | |
380 | * -------------------------------------------------------------------------- */ | |
381 | /* | |
382 | * This is the IPMI opregion space handler. | |
383 | * @function: indicates the read/write. In fact as the IPMI message is driven | |
384 | * by command, only write is meaningful. | |
385 | * @address: This contains the netfn/command of IPMI request message. | |
386 | * @bits : not used. | |
387 | * @value : it is an in/out parameter. It points to the IPMI message buffer. | |
388 | * Before the IPMI message is sent, it represents the actual request | |
389 | * IPMI message. After the IPMI message is finished, it represents | |
390 | * the response IPMI message returned by IPMI command. | |
391 | * @handler_context: IPMI device context. | |
392 | */ | |
393 | ||
394 | static acpi_status | |
395 | acpi_ipmi_space_handler(u32 function, acpi_physical_address address, | |
396 | u32 bits, acpi_integer *value, | |
397 | void *handler_context, void *region_context) | |
398 | { | |
399 | struct acpi_ipmi_msg *tx_msg; | |
400 | struct acpi_ipmi_device *ipmi_device = handler_context; | |
8584ec6a | 401 | int err; |
e92b297c | 402 | acpi_status status; |
06a8566b | 403 | unsigned long flags; |
e92b297c ZY |
404 | /* |
405 | * IPMI opregion message. | |
406 | * IPMI message is firstly written to the BMC and system software | |
407 | * can get the respsonse. So it is unmeaningful for the read access | |
408 | * of IPMI opregion. | |
409 | */ | |
410 | if ((function & ACPI_IO_MASK) == ACPI_READ) | |
411 | return AE_TYPE; | |
412 | ||
413 | if (!ipmi_device->user_interface) | |
414 | return AE_NOT_EXIST; | |
415 | ||
416 | tx_msg = acpi_alloc_ipmi_msg(ipmi_device); | |
417 | if (!tx_msg) | |
418 | return AE_NO_MEMORY; | |
419 | ||
6b68f03f LZ |
420 | if (acpi_format_ipmi_request(tx_msg, address, value) != 0) { |
421 | status = AE_TYPE; | |
422 | goto out_msg; | |
423 | } | |
06a8566b | 424 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
e92b297c | 425 | list_add_tail(&tx_msg->head, &ipmi_device->tx_msg_list); |
06a8566b | 426 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
e92b297c ZY |
427 | err = ipmi_request_settime(ipmi_device->user_interface, |
428 | &tx_msg->addr, | |
429 | tx_msg->tx_msgid, | |
430 | &tx_msg->tx_message, | |
8584ec6a | 431 | NULL, 0, 0, IPMI_TIMEOUT); |
e92b297c ZY |
432 | if (err) { |
433 | status = AE_ERROR; | |
6b68f03f | 434 | goto out_list; |
e92b297c | 435 | } |
8584ec6a LZ |
436 | wait_for_completion(&tx_msg->tx_complete); |
437 | acpi_format_ipmi_response(tx_msg, value); | |
e92b297c ZY |
438 | status = AE_OK; |
439 | ||
6b68f03f | 440 | out_list: |
06a8566b | 441 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
e92b297c | 442 | list_del(&tx_msg->head); |
06a8566b | 443 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
6b68f03f | 444 | out_msg: |
e92b297c ZY |
445 | kfree(tx_msg); |
446 | return status; | |
447 | } | |
448 | ||
449 | static void ipmi_remove_space_handler(struct acpi_ipmi_device *ipmi) | |
450 | { | |
451 | if (!test_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags)) | |
452 | return; | |
453 | ||
454 | acpi_remove_address_space_handler(ipmi->handle, | |
455 | ACPI_ADR_SPACE_IPMI, &acpi_ipmi_space_handler); | |
456 | ||
457 | clear_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags); | |
458 | } | |
459 | ||
460 | static int ipmi_install_space_handler(struct acpi_ipmi_device *ipmi) | |
461 | { | |
462 | acpi_status status; | |
463 | ||
464 | if (test_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags)) | |
465 | return 0; | |
466 | ||
467 | status = acpi_install_address_space_handler(ipmi->handle, | |
468 | ACPI_ADR_SPACE_IPMI, | |
469 | &acpi_ipmi_space_handler, | |
470 | NULL, ipmi); | |
471 | if (ACPI_FAILURE(status)) { | |
472 | struct pnp_dev *pnp_dev = ipmi->pnp_dev; | |
473 | dev_warn(&pnp_dev->dev, "Can't register IPMI opregion space " | |
474 | "handle\n"); | |
475 | return -EINVAL; | |
476 | } | |
477 | set_bit(IPMI_FLAGS_HANDLER_INSTALL, &ipmi->flags); | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static void acpi_add_ipmi_device(struct acpi_ipmi_device *ipmi_device) | |
482 | { | |
483 | ||
484 | INIT_LIST_HEAD(&ipmi_device->head); | |
485 | ||
06a8566b | 486 | spin_lock_init(&ipmi_device->tx_msg_lock); |
e92b297c ZY |
487 | INIT_LIST_HEAD(&ipmi_device->tx_msg_list); |
488 | ipmi_install_space_handler(ipmi_device); | |
489 | ||
490 | list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices); | |
491 | } | |
492 | ||
493 | static void acpi_remove_ipmi_device(struct acpi_ipmi_device *ipmi_device) | |
494 | { | |
495 | /* | |
496 | * If the IPMI user interface is created, it should be | |
497 | * destroyed. | |
498 | */ | |
499 | if (ipmi_device->user_interface) { | |
500 | ipmi_destroy_user(ipmi_device->user_interface); | |
501 | ipmi_device->user_interface = NULL; | |
502 | } | |
503 | /* flush the Tx_msg list */ | |
504 | if (!list_empty(&ipmi_device->tx_msg_list)) | |
505 | ipmi_flush_tx_msg(ipmi_device); | |
506 | ||
507 | list_del(&ipmi_device->head); | |
508 | ipmi_remove_space_handler(ipmi_device); | |
509 | } | |
510 | ||
511 | static int __init acpi_ipmi_init(void) | |
512 | { | |
513 | int result = 0; | |
514 | ||
515 | if (acpi_disabled) | |
516 | return result; | |
517 | ||
518 | mutex_init(&driver_data.ipmi_lock); | |
519 | ||
520 | result = ipmi_smi_watcher_register(&driver_data.bmc_events); | |
521 | ||
522 | return result; | |
523 | } | |
524 | ||
525 | static void __exit acpi_ipmi_exit(void) | |
526 | { | |
527 | struct acpi_ipmi_device *ipmi_device, *temp; | |
528 | ||
529 | if (acpi_disabled) | |
530 | return; | |
531 | ||
532 | ipmi_smi_watcher_unregister(&driver_data.bmc_events); | |
533 | ||
534 | /* | |
535 | * When one smi_watcher is unregistered, it is only deleted | |
536 | * from the smi_watcher list. But the smi_gone callback function | |
537 | * is not called. So explicitly uninstall the ACPI IPMI oregion | |
538 | * handler and free it. | |
539 | */ | |
540 | mutex_lock(&driver_data.ipmi_lock); | |
541 | list_for_each_entry_safe(ipmi_device, temp, | |
542 | &driver_data.ipmi_devices, head) { | |
543 | acpi_remove_ipmi_device(ipmi_device); | |
544 | put_device(ipmi_device->smi_data.dev); | |
545 | kfree(ipmi_device); | |
546 | } | |
547 | mutex_unlock(&driver_data.ipmi_lock); | |
548 | } | |
549 | ||
550 | module_init(acpi_ipmi_init); | |
551 | module_exit(acpi_ipmi_exit); |