1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * acpi_ipmi.c - ACPI IPMI opregion |
4 | * |
5 | * Copyright (C) 2010, 2013 Intel Corporation |
6 | * Author: Zhao Yakui <yakui.zhao@intel.com> |
7 | * Lv Zheng <lv.zheng@intel.com> |
8 | */ |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/acpi.h> |
12 | #include <linux/ipmi.h> |
13 | #include <linux/spinlock.h> |
14 | |
15 | MODULE_AUTHOR("Zhao Yakui" ); |
16 | MODULE_DESCRIPTION("ACPI IPMI Opregion driver" ); |
17 | MODULE_LICENSE("GPL" ); |
18 | |
19 | #define ACPI_IPMI_OK 0 |
20 | #define ACPI_IPMI_TIMEOUT 0x10 |
21 | #define ACPI_IPMI_UNKNOWN 0x07 |
22 | /* the IPMI timeout is 5s */ |
23 | #define IPMI_TIMEOUT (5000) |
24 | #define ACPI_IPMI_MAX_MSG_LENGTH 64 |
25 | |
26 | struct acpi_ipmi_device { |
27 | /* the device list attached to driver_data.ipmi_devices */ |
28 | struct list_head head; |
29 | |
30 | /* the IPMI request message list */ |
31 | struct list_head tx_msg_list; |
32 | |
33 | spinlock_t tx_msg_lock; |
34 | acpi_handle handle; |
35 | struct device *dev; |
36 | struct ipmi_user *user_interface; |
37 | int ipmi_ifnum; /* IPMI interface number */ |
38 | long curr_msgid; |
39 | bool dead; |
40 | struct kref kref; |
41 | }; |
42 | |
43 | struct ipmi_driver_data { |
44 | struct list_head ipmi_devices; |
45 | struct ipmi_smi_watcher bmc_events; |
46 | const struct ipmi_user_hndl ipmi_hndlrs; |
47 | struct mutex ipmi_lock; |
48 | |
49 | /* |
50 | * NOTE: IPMI System Interface Selection |
51 | * There is no system interface specified by the IPMI operation |
52 | * region access. We try to select one system interface with ACPI |
53 | * handle set. IPMI messages passed from the ACPI codes are sent |
54 | * to this selected global IPMI system interface. |
55 | */ |
56 | struct acpi_ipmi_device *selected_smi; |
57 | }; |
58 | |
59 | struct acpi_ipmi_msg { |
60 | struct list_head head; |
61 | |
62 | /* |
63 | * General speaking the addr type should be SI_ADDR_TYPE. And |
64 | * the addr channel should be BMC. |
65 | * In fact it can also be IPMB type. But we will have to |
66 | * parse it from the Netfn command buffer. It is so complex |
67 | * that it is skipped. |
68 | */ |
69 | struct ipmi_addr addr; |
70 | long tx_msgid; |
71 | |
72 | /* it is used to track whether the IPMI message is finished */ |
73 | struct completion tx_complete; |
74 | |
75 | struct kernel_ipmi_msg tx_message; |
76 | int msg_done; |
77 | |
78 | /* tx/rx data . And copy it from/to ACPI object buffer */ |
79 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
80 | u8 rx_len; |
81 | |
82 | struct acpi_ipmi_device *device; |
83 | struct kref kref; |
84 | }; |
85 | |
86 | /* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */ |
87 | struct acpi_ipmi_buffer { |
88 | u8 status; |
89 | u8 length; |
90 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
91 | }; |
92 | |
93 | static void ipmi_register_bmc(int iface, struct device *dev); |
94 | static void ipmi_bmc_gone(int iface); |
95 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); |
96 | |
97 | static struct ipmi_driver_data driver_data = { |
98 | .ipmi_devices = LIST_HEAD_INIT(driver_data.ipmi_devices), |
99 | .bmc_events = { |
100 | .owner = THIS_MODULE, |
101 | .new_smi = ipmi_register_bmc, |
102 | .smi_gone = ipmi_bmc_gone, |
103 | }, |
104 | .ipmi_hndlrs = { |
105 | .ipmi_recv_hndl = ipmi_msg_handler, |
106 | }, |
107 | .ipmi_lock = __MUTEX_INITIALIZER(driver_data.ipmi_lock) |
108 | }; |
109 | |
110 | static struct acpi_ipmi_device * |
111 | ipmi_dev_alloc(int iface, struct device *dev, acpi_handle handle) |
112 | { |
113 | struct acpi_ipmi_device *ipmi_device; |
114 | int err; |
115 | struct ipmi_user *user; |
116 | |
117 | ipmi_device = kzalloc(size: sizeof(*ipmi_device), GFP_KERNEL); |
118 | if (!ipmi_device) |
119 | return NULL; |
120 | |
121 | kref_init(kref: &ipmi_device->kref); |
122 | INIT_LIST_HEAD(list: &ipmi_device->head); |
123 | INIT_LIST_HEAD(list: &ipmi_device->tx_msg_list); |
124 | spin_lock_init(&ipmi_device->tx_msg_lock); |
125 | ipmi_device->handle = handle; |
126 | ipmi_device->dev = get_device(dev); |
127 | ipmi_device->ipmi_ifnum = iface; |
128 | |
129 | err = ipmi_create_user(if_num: iface, handler: &driver_data.ipmi_hndlrs, |
130 | handler_data: ipmi_device, user: &user); |
131 | if (err) { |
132 | put_device(dev); |
133 | kfree(objp: ipmi_device); |
134 | return NULL; |
135 | } |
136 | ipmi_device->user_interface = user; |
137 | |
138 | return ipmi_device; |
139 | } |
140 | |
141 | static void ipmi_dev_release(struct acpi_ipmi_device *ipmi_device) |
142 | { |
143 | ipmi_destroy_user(user: ipmi_device->user_interface); |
144 | put_device(dev: ipmi_device->dev); |
145 | kfree(objp: ipmi_device); |
146 | } |
147 | |
148 | static void ipmi_dev_release_kref(struct kref *kref) |
149 | { |
150 | struct acpi_ipmi_device *ipmi = |
151 | container_of(kref, struct acpi_ipmi_device, kref); |
152 | |
153 | ipmi_dev_release(ipmi_device: ipmi); |
154 | } |
155 | |
156 | static void __ipmi_dev_kill(struct acpi_ipmi_device *ipmi_device) |
157 | { |
158 | list_del(entry: &ipmi_device->head); |
159 | if (driver_data.selected_smi == ipmi_device) |
160 | driver_data.selected_smi = NULL; |
161 | |
162 | /* |
163 | * Always setting dead flag after deleting from the list or |
164 | * list_for_each_entry() codes must get changed. |
165 | */ |
166 | ipmi_device->dead = true; |
167 | } |
168 | |
169 | static struct acpi_ipmi_device *acpi_ipmi_dev_get(void) |
170 | { |
171 | struct acpi_ipmi_device *ipmi_device = NULL; |
172 | |
173 | mutex_lock(&driver_data.ipmi_lock); |
174 | if (driver_data.selected_smi) { |
175 | ipmi_device = driver_data.selected_smi; |
176 | kref_get(kref: &ipmi_device->kref); |
177 | } |
178 | mutex_unlock(lock: &driver_data.ipmi_lock); |
179 | |
180 | return ipmi_device; |
181 | } |
182 | |
183 | static void acpi_ipmi_dev_put(struct acpi_ipmi_device *ipmi_device) |
184 | { |
185 | kref_put(kref: &ipmi_device->kref, release: ipmi_dev_release_kref); |
186 | } |
187 | |
188 | static struct acpi_ipmi_msg *ipmi_msg_alloc(void) |
189 | { |
190 | struct acpi_ipmi_device *ipmi; |
191 | struct acpi_ipmi_msg *ipmi_msg; |
192 | |
193 | ipmi = acpi_ipmi_dev_get(); |
194 | if (!ipmi) |
195 | return NULL; |
196 | |
197 | ipmi_msg = kzalloc(size: sizeof(struct acpi_ipmi_msg), GFP_KERNEL); |
198 | if (!ipmi_msg) { |
199 | acpi_ipmi_dev_put(ipmi_device: ipmi); |
200 | return NULL; |
201 | } |
202 | |
203 | kref_init(kref: &ipmi_msg->kref); |
204 | init_completion(x: &ipmi_msg->tx_complete); |
205 | INIT_LIST_HEAD(list: &ipmi_msg->head); |
206 | ipmi_msg->device = ipmi; |
207 | ipmi_msg->msg_done = ACPI_IPMI_UNKNOWN; |
208 | |
209 | return ipmi_msg; |
210 | } |
211 | |
212 | static void ipmi_msg_release(struct acpi_ipmi_msg *tx_msg) |
213 | { |
214 | acpi_ipmi_dev_put(ipmi_device: tx_msg->device); |
215 | kfree(objp: tx_msg); |
216 | } |
217 | |
218 | static void ipmi_msg_release_kref(struct kref *kref) |
219 | { |
220 | struct acpi_ipmi_msg *tx_msg = |
221 | container_of(kref, struct acpi_ipmi_msg, kref); |
222 | |
223 | ipmi_msg_release(tx_msg); |
224 | } |
225 | |
226 | static struct acpi_ipmi_msg *acpi_ipmi_msg_get(struct acpi_ipmi_msg *tx_msg) |
227 | { |
228 | kref_get(kref: &tx_msg->kref); |
229 | |
230 | return tx_msg; |
231 | } |
232 | |
233 | static void acpi_ipmi_msg_put(struct acpi_ipmi_msg *tx_msg) |
234 | { |
235 | kref_put(kref: &tx_msg->kref, release: ipmi_msg_release_kref); |
236 | } |
237 | |
238 | #define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff) |
239 | #define IPMI_OP_RGN_CMD(offset) (offset & 0xff) |
240 | static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg, |
241 | acpi_physical_address address, |
242 | acpi_integer *value) |
243 | { |
244 | struct kernel_ipmi_msg *msg; |
245 | struct acpi_ipmi_buffer *buffer; |
246 | struct acpi_ipmi_device *device; |
247 | unsigned long flags; |
248 | |
249 | msg = &tx_msg->tx_message; |
250 | |
251 | /* |
252 | * IPMI network function and command are encoded in the address |
253 | * within the IPMI OpRegion; see ACPI 4.0, sec 5.5.2.4.3. |
254 | */ |
255 | msg->netfn = IPMI_OP_RGN_NETFN(address); |
256 | msg->cmd = IPMI_OP_RGN_CMD(address); |
257 | msg->data = tx_msg->data; |
258 | |
259 | /* |
260 | * value is the parameter passed by the IPMI opregion space handler. |
261 | * It points to the IPMI request message buffer |
262 | */ |
263 | buffer = (struct acpi_ipmi_buffer *)value; |
264 | |
265 | /* copy the tx message data */ |
266 | if (buffer->length > ACPI_IPMI_MAX_MSG_LENGTH) { |
267 | dev_WARN_ONCE(tx_msg->device->dev, true, |
268 | "Unexpected request (msg len %d).\n" , |
269 | buffer->length); |
270 | return -EINVAL; |
271 | } |
272 | msg->data_len = buffer->length; |
273 | memcpy(tx_msg->data, buffer->data, msg->data_len); |
274 | |
275 | /* |
276 | * now the default type is SYSTEM_INTERFACE and channel type is BMC. |
277 | * If the netfn is APP_REQUEST and the cmd is SEND_MESSAGE, |
278 | * the addr type should be changed to IPMB. Then we will have to parse |
279 | * the IPMI request message buffer to get the IPMB address. |
280 | * If so, please fix me. |
281 | */ |
282 | tx_msg->addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
283 | tx_msg->addr.channel = IPMI_BMC_CHANNEL; |
284 | tx_msg->addr.data[0] = 0; |
285 | |
286 | /* Get the msgid */ |
287 | device = tx_msg->device; |
288 | |
289 | spin_lock_irqsave(&device->tx_msg_lock, flags); |
290 | device->curr_msgid++; |
291 | tx_msg->tx_msgid = device->curr_msgid; |
292 | spin_unlock_irqrestore(lock: &device->tx_msg_lock, flags); |
293 | |
294 | return 0; |
295 | } |
296 | |
297 | static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg, |
298 | acpi_integer *value) |
299 | { |
300 | struct acpi_ipmi_buffer *buffer; |
301 | |
302 | /* |
303 | * value is also used as output parameter. It represents the response |
304 | * IPMI message returned by IPMI command. |
305 | */ |
306 | buffer = (struct acpi_ipmi_buffer *)value; |
307 | |
308 | /* |
309 | * If the flag of msg_done is not set, it means that the IPMI command is |
310 | * not executed correctly. |
311 | */ |
312 | buffer->status = msg->msg_done; |
313 | if (msg->msg_done != ACPI_IPMI_OK) |
314 | return; |
315 | |
316 | /* |
317 | * If the IPMI response message is obtained correctly, the status code |
318 | * will be ACPI_IPMI_OK |
319 | */ |
320 | buffer->length = msg->rx_len; |
321 | memcpy(buffer->data, msg->data, msg->rx_len); |
322 | } |
323 | |
324 | static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi) |
325 | { |
326 | struct acpi_ipmi_msg *tx_msg; |
327 | unsigned long flags; |
328 | |
329 | /* |
330 | * NOTE: On-going ipmi_recv_msg |
331 | * ipmi_msg_handler() may still be invoked by ipmi_si after |
332 | * flushing. But it is safe to do a fast flushing on module_exit() |
333 | * without waiting for all ipmi_recv_msg(s) to complete from |
334 | * ipmi_msg_handler() as it is ensured by ipmi_si that all |
335 | * ipmi_recv_msg(s) are freed after invoking ipmi_destroy_user(). |
336 | */ |
337 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
338 | while (!list_empty(head: &ipmi->tx_msg_list)) { |
339 | tx_msg = list_first_entry(&ipmi->tx_msg_list, |
340 | struct acpi_ipmi_msg, |
341 | head); |
342 | list_del(entry: &tx_msg->head); |
343 | spin_unlock_irqrestore(lock: &ipmi->tx_msg_lock, flags); |
344 | |
345 | /* wake up the sleep thread on the Tx msg */ |
346 | complete(&tx_msg->tx_complete); |
347 | acpi_ipmi_msg_put(tx_msg); |
348 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
349 | } |
350 | spin_unlock_irqrestore(lock: &ipmi->tx_msg_lock, flags); |
351 | } |
352 | |
353 | static void ipmi_cancel_tx_msg(struct acpi_ipmi_device *ipmi, |
354 | struct acpi_ipmi_msg *msg) |
355 | { |
356 | struct acpi_ipmi_msg *tx_msg = NULL, *iter, *temp; |
357 | unsigned long flags; |
358 | |
359 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
360 | list_for_each_entry_safe(iter, temp, &ipmi->tx_msg_list, head) { |
361 | if (msg == iter) { |
362 | tx_msg = iter; |
363 | list_del(entry: &iter->head); |
364 | break; |
365 | } |
366 | } |
367 | spin_unlock_irqrestore(lock: &ipmi->tx_msg_lock, flags); |
368 | |
369 | if (tx_msg) |
370 | acpi_ipmi_msg_put(tx_msg); |
371 | } |
372 | |
373 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) |
374 | { |
375 | struct acpi_ipmi_device *ipmi_device = user_msg_data; |
376 | struct acpi_ipmi_msg *tx_msg = NULL, *iter, *temp; |
377 | struct device *dev = ipmi_device->dev; |
378 | unsigned long flags; |
379 | |
380 | if (msg->user != ipmi_device->user_interface) { |
381 | dev_warn(dev, |
382 | "Unexpected response is returned. returned user %p, expected user %p\n" , |
383 | msg->user, ipmi_device->user_interface); |
384 | goto out_msg; |
385 | } |
386 | |
387 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
388 | list_for_each_entry_safe(iter, temp, &ipmi_device->tx_msg_list, head) { |
389 | if (msg->msgid == iter->tx_msgid) { |
390 | tx_msg = iter; |
391 | list_del(entry: &iter->head); |
392 | break; |
393 | } |
394 | } |
395 | spin_unlock_irqrestore(lock: &ipmi_device->tx_msg_lock, flags); |
396 | |
397 | if (!tx_msg) { |
398 | dev_warn(dev, |
399 | "Unexpected response (msg id %ld) is returned.\n" , |
400 | msg->msgid); |
401 | goto out_msg; |
402 | } |
403 | |
404 | /* copy the response data to Rx_data buffer */ |
405 | if (msg->msg.data_len > ACPI_IPMI_MAX_MSG_LENGTH) { |
406 | dev_WARN_ONCE(dev, true, |
407 | "Unexpected response (msg len %d).\n" , |
408 | msg->msg.data_len); |
409 | goto out_comp; |
410 | } |
411 | |
412 | /* response msg is an error msg */ |
413 | msg->recv_type = IPMI_RESPONSE_RECV_TYPE; |
414 | if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE && |
415 | msg->msg.data_len == 1) { |
416 | if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) { |
417 | dev_dbg_once(dev, "Unexpected response (timeout).\n" ); |
418 | tx_msg->msg_done = ACPI_IPMI_TIMEOUT; |
419 | } |
420 | goto out_comp; |
421 | } |
422 | |
423 | tx_msg->rx_len = msg->msg.data_len; |
424 | memcpy(tx_msg->data, msg->msg.data, tx_msg->rx_len); |
425 | tx_msg->msg_done = ACPI_IPMI_OK; |
426 | |
427 | out_comp: |
428 | complete(&tx_msg->tx_complete); |
429 | acpi_ipmi_msg_put(tx_msg); |
430 | out_msg: |
431 | ipmi_free_recv_msg(msg); |
432 | } |
433 | |
434 | static void ipmi_register_bmc(int iface, struct device *dev) |
435 | { |
436 | struct acpi_ipmi_device *ipmi_device, *temp; |
437 | int err; |
438 | struct ipmi_smi_info smi_data; |
439 | acpi_handle handle; |
440 | |
441 | err = ipmi_get_smi_info(if_num: iface, data: &smi_data); |
442 | if (err) |
443 | return; |
444 | |
445 | if (smi_data.addr_src != SI_ACPI) |
446 | goto err_ref; |
447 | handle = smi_data.addr_info.acpi_info.acpi_handle; |
448 | if (!handle) |
449 | goto err_ref; |
450 | |
451 | ipmi_device = ipmi_dev_alloc(iface, dev: smi_data.dev, handle); |
452 | if (!ipmi_device) { |
453 | dev_warn(smi_data.dev, "Can't create IPMI user interface\n" ); |
454 | goto err_ref; |
455 | } |
456 | |
457 | mutex_lock(&driver_data.ipmi_lock); |
458 | list_for_each_entry(temp, &driver_data.ipmi_devices, head) { |
459 | /* |
460 | * if the corresponding ACPI handle is already added |
461 | * to the device list, don't add it again. |
462 | */ |
463 | if (temp->handle == handle) |
464 | goto err_lock; |
465 | } |
466 | if (!driver_data.selected_smi) |
467 | driver_data.selected_smi = ipmi_device; |
468 | list_add_tail(new: &ipmi_device->head, head: &driver_data.ipmi_devices); |
469 | mutex_unlock(lock: &driver_data.ipmi_lock); |
470 | |
471 | put_device(dev: smi_data.dev); |
472 | return; |
473 | |
474 | err_lock: |
475 | mutex_unlock(lock: &driver_data.ipmi_lock); |
476 | ipmi_dev_release(ipmi_device); |
477 | err_ref: |
478 | put_device(dev: smi_data.dev); |
479 | } |
480 | |
481 | static void ipmi_bmc_gone(int iface) |
482 | { |
483 | struct acpi_ipmi_device *ipmi_device = NULL, *iter, *temp; |
484 | |
485 | mutex_lock(&driver_data.ipmi_lock); |
486 | list_for_each_entry_safe(iter, temp, |
487 | &driver_data.ipmi_devices, head) { |
488 | if (iter->ipmi_ifnum != iface) { |
489 | ipmi_device = iter; |
490 | __ipmi_dev_kill(ipmi_device: iter); |
491 | break; |
492 | } |
493 | } |
494 | if (!driver_data.selected_smi) |
495 | driver_data.selected_smi = list_first_entry_or_null( |
496 | &driver_data.ipmi_devices, |
497 | struct acpi_ipmi_device, head); |
498 | mutex_unlock(lock: &driver_data.ipmi_lock); |
499 | |
500 | if (ipmi_device) { |
501 | ipmi_flush_tx_msg(ipmi: ipmi_device); |
502 | acpi_ipmi_dev_put(ipmi_device); |
503 | } |
504 | } |
505 | |
506 | /* |
507 | * This is the IPMI opregion space handler. |
508 | * @function: indicates the read/write. In fact as the IPMI message is driven |
509 | * by command, only write is meaningful. |
510 | * @address: This contains the netfn/command of IPMI request message. |
511 | * @bits : not used. |
512 | * @value : it is an in/out parameter. It points to the IPMI message buffer. |
513 | * Before the IPMI message is sent, it represents the actual request |
514 | * IPMI message. After the IPMI message is finished, it represents |
515 | * the response IPMI message returned by IPMI command. |
516 | * @handler_context: IPMI device context. |
517 | */ |
518 | static acpi_status |
519 | acpi_ipmi_space_handler(u32 function, acpi_physical_address address, |
520 | u32 bits, acpi_integer *value, |
521 | void *handler_context, void *region_context) |
522 | { |
523 | struct acpi_ipmi_msg *tx_msg; |
524 | struct acpi_ipmi_device *ipmi_device; |
525 | int err; |
526 | acpi_status status; |
527 | unsigned long flags; |
528 | |
529 | /* |
530 | * IPMI opregion message. |
531 | * IPMI message is firstly written to the BMC and system software |
532 | * can get the respsonse. So it is unmeaningful for the read access |
533 | * of IPMI opregion. |
534 | */ |
535 | if ((function & ACPI_IO_MASK) == ACPI_READ) |
536 | return AE_TYPE; |
537 | |
538 | tx_msg = ipmi_msg_alloc(); |
539 | if (!tx_msg) |
540 | return AE_NOT_EXIST; |
541 | ipmi_device = tx_msg->device; |
542 | |
543 | if (acpi_format_ipmi_request(tx_msg, address, value) != 0) { |
544 | ipmi_msg_release(tx_msg); |
545 | return AE_TYPE; |
546 | } |
547 | |
548 | acpi_ipmi_msg_get(tx_msg); |
549 | mutex_lock(&driver_data.ipmi_lock); |
550 | /* Do not add a tx_msg that can not be flushed. */ |
551 | if (ipmi_device->dead) { |
552 | mutex_unlock(lock: &driver_data.ipmi_lock); |
553 | ipmi_msg_release(tx_msg); |
554 | return AE_NOT_EXIST; |
555 | } |
556 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
557 | list_add_tail(new: &tx_msg->head, head: &ipmi_device->tx_msg_list); |
558 | spin_unlock_irqrestore(lock: &ipmi_device->tx_msg_lock, flags); |
559 | mutex_unlock(lock: &driver_data.ipmi_lock); |
560 | |
561 | err = ipmi_request_settime(user: ipmi_device->user_interface, |
562 | addr: &tx_msg->addr, |
563 | msgid: tx_msg->tx_msgid, |
564 | msg: &tx_msg->tx_message, |
565 | NULL, priority: 0, max_retries: 0, IPMI_TIMEOUT); |
566 | if (err) { |
567 | status = AE_ERROR; |
568 | goto out_msg; |
569 | } |
570 | wait_for_completion(&tx_msg->tx_complete); |
571 | |
572 | acpi_format_ipmi_response(msg: tx_msg, value); |
573 | status = AE_OK; |
574 | |
575 | out_msg: |
576 | ipmi_cancel_tx_msg(ipmi: ipmi_device, msg: tx_msg); |
577 | acpi_ipmi_msg_put(tx_msg); |
578 | return status; |
579 | } |
580 | |
581 | static int __init acpi_ipmi_init(void) |
582 | { |
583 | int result; |
584 | acpi_status status; |
585 | |
586 | if (acpi_disabled) |
587 | return 0; |
588 | |
589 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, |
590 | ACPI_ADR_SPACE_IPMI, |
591 | handler: &acpi_ipmi_space_handler, |
592 | NULL, NULL); |
593 | if (ACPI_FAILURE(status)) { |
594 | pr_warn("Can't register IPMI opregion space handle\n" ); |
595 | return -EINVAL; |
596 | } |
597 | |
598 | result = ipmi_smi_watcher_register(watcher: &driver_data.bmc_events); |
599 | if (result) { |
600 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
601 | ACPI_ADR_SPACE_IPMI, |
602 | handler: &acpi_ipmi_space_handler); |
603 | pr_err("Can't register IPMI system interface watcher\n" ); |
604 | } |
605 | |
606 | return result; |
607 | } |
608 | |
609 | static void __exit acpi_ipmi_exit(void) |
610 | { |
611 | struct acpi_ipmi_device *ipmi_device; |
612 | |
613 | if (acpi_disabled) |
614 | return; |
615 | |
616 | ipmi_smi_watcher_unregister(watcher: &driver_data.bmc_events); |
617 | |
618 | /* |
619 | * When one smi_watcher is unregistered, it is only deleted |
620 | * from the smi_watcher list. But the smi_gone callback function |
621 | * is not called. So explicitly uninstall the ACPI IPMI oregion |
622 | * handler and free it. |
623 | */ |
624 | mutex_lock(&driver_data.ipmi_lock); |
625 | while (!list_empty(head: &driver_data.ipmi_devices)) { |
626 | ipmi_device = list_first_entry(&driver_data.ipmi_devices, |
627 | struct acpi_ipmi_device, |
628 | head); |
629 | __ipmi_dev_kill(ipmi_device); |
630 | mutex_unlock(lock: &driver_data.ipmi_lock); |
631 | |
632 | ipmi_flush_tx_msg(ipmi: ipmi_device); |
633 | acpi_ipmi_dev_put(ipmi_device); |
634 | |
635 | mutex_lock(&driver_data.ipmi_lock); |
636 | } |
637 | mutex_unlock(lock: &driver_data.ipmi_lock); |
638 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
639 | ACPI_ADR_SPACE_IPMI, |
640 | handler: &acpi_ipmi_space_handler); |
641 | } |
642 | |
643 | module_init(acpi_ipmi_init); |
644 | module_exit(acpi_ipmi_exit); |
645 | |