Commit | Line | Data |
---|---|---|
c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
e92b297c ZY |
2 | /* |
3 | * acpi_ipmi.c - ACPI IPMI opregion | |
4 | * | |
a1a69b29 LZ |
5 | * Copyright (C) 2010, 2013 Intel Corporation |
6 | * Author: Zhao Yakui <yakui.zhao@intel.com> | |
7 | * Lv Zheng <lv.zheng@intel.com> | |
e92b297c ZY |
8 | */ |
9 | ||
e92b297c | 10 | #include <linux/module.h> |
935a9e3f | 11 | #include <linux/acpi.h> |
e92b297c | 12 | #include <linux/ipmi.h> |
06a8566b | 13 | #include <linux/spinlock.h> |
e92b297c ZY |
14 | |
15 | MODULE_AUTHOR("Zhao Yakui"); | |
16 | MODULE_DESCRIPTION("ACPI IPMI Opregion driver"); | |
17 | MODULE_LICENSE("GPL"); | |
18 | ||
e92b297c ZY |
19 | #define ACPI_IPMI_OK 0 |
20 | #define ACPI_IPMI_TIMEOUT 0x10 | |
21 | #define ACPI_IPMI_UNKNOWN 0x07 | |
22 | /* the IPMI timeout is 5s */ | |
8584ec6a | 23 | #define IPMI_TIMEOUT (5000) |
6b68f03f | 24 | #define ACPI_IPMI_MAX_MSG_LENGTH 64 |
e92b297c ZY |
25 | |
26 | struct acpi_ipmi_device { | |
27 | /* the device list attached to driver_data.ipmi_devices */ | |
28 | struct list_head head; | |
50065300 | 29 | |
e92b297c ZY |
30 | /* the IPMI request message list */ |
31 | struct list_head tx_msg_list; | |
50065300 LZ |
32 | |
33 | spinlock_t tx_msg_lock; | |
e92b297c | 34 | acpi_handle handle; |
2fb037b8 | 35 | struct device *dev; |
ebba75fd | 36 | struct ipmi_user *user_interface; |
e92b297c ZY |
37 | int ipmi_ifnum; /* IPMI interface number */ |
38 | long curr_msgid; | |
a1a69b29 LZ |
39 | bool dead; |
40 | struct kref kref; | |
e92b297c ZY |
41 | }; |
42 | ||
43 | struct ipmi_driver_data { | |
50065300 LZ |
44 | struct list_head ipmi_devices; |
45 | struct ipmi_smi_watcher bmc_events; | |
c690d141 | 46 | const struct ipmi_user_hndl ipmi_hndlrs; |
50065300 LZ |
47 | struct mutex ipmi_lock; |
48 | ||
e96a94ed LZ |
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; | |
e92b297c ZY |
57 | }; |
58 | ||
59 | struct acpi_ipmi_msg { | |
60 | struct list_head head; | |
50065300 | 61 | |
e92b297c ZY |
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; | |
50065300 | 71 | |
e92b297c ZY |
72 | /* it is used to track whether the IPMI message is finished */ |
73 | struct completion tx_complete; | |
50065300 | 74 | |
e92b297c | 75 | struct kernel_ipmi_msg tx_message; |
50065300 LZ |
76 | int msg_done; |
77 | ||
6b68f03f | 78 | /* tx/rx data . And copy it from/to ACPI object buffer */ |
50065300 LZ |
79 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
80 | u8 rx_len; | |
81 | ||
e92b297c | 82 | struct acpi_ipmi_device *device; |
50065300 | 83 | struct kref kref; |
e92b297c ZY |
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; | |
6b68f03f | 90 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
e92b297c ZY |
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); | |
e92b297c ZY |
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 | }, | |
a194aa43 | 107 | .ipmi_lock = __MUTEX_INITIALIZER(driver_data.ipmi_lock) |
e92b297c ZY |
108 | }; |
109 | ||
a1a69b29 | 110 | static struct acpi_ipmi_device * |
2fb037b8 | 111 | ipmi_dev_alloc(int iface, struct device *dev, acpi_handle handle) |
a1a69b29 LZ |
112 | { |
113 | struct acpi_ipmi_device *ipmi_device; | |
114 | int err; | |
ebba75fd | 115 | struct ipmi_user *user; |
a1a69b29 LZ |
116 | |
117 | ipmi_device = kzalloc(sizeof(*ipmi_device), GFP_KERNEL); | |
118 | if (!ipmi_device) | |
119 | return NULL; | |
120 | ||
121 | kref_init(&ipmi_device->kref); | |
122 | INIT_LIST_HEAD(&ipmi_device->head); | |
123 | INIT_LIST_HEAD(&ipmi_device->tx_msg_list); | |
124 | spin_lock_init(&ipmi_device->tx_msg_lock); | |
a1a69b29 | 125 | ipmi_device->handle = handle; |
2fb037b8 | 126 | ipmi_device->dev = get_device(dev); |
a1a69b29 LZ |
127 | ipmi_device->ipmi_ifnum = iface; |
128 | ||
129 | err = ipmi_create_user(iface, &driver_data.ipmi_hndlrs, | |
130 | ipmi_device, &user); | |
131 | if (err) { | |
2fb037b8 | 132 | put_device(dev); |
a1a69b29 LZ |
133 | kfree(ipmi_device); |
134 | return NULL; | |
135 | } | |
136 | ipmi_device->user_interface = user; | |
a1a69b29 LZ |
137 | |
138 | return ipmi_device; | |
139 | } | |
140 | ||
141 | static void ipmi_dev_release(struct acpi_ipmi_device *ipmi_device) | |
142 | { | |
a1a69b29 | 143 | ipmi_destroy_user(ipmi_device->user_interface); |
2fb037b8 | 144 | put_device(ipmi_device->dev); |
a1a69b29 LZ |
145 | kfree(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); | |
154 | } | |
155 | ||
156 | static void __ipmi_dev_kill(struct acpi_ipmi_device *ipmi_device) | |
157 | { | |
158 | list_del(&ipmi_device->head); | |
e96a94ed LZ |
159 | if (driver_data.selected_smi == ipmi_device) |
160 | driver_data.selected_smi = NULL; | |
50065300 | 161 | |
a1a69b29 LZ |
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 | ||
e96a94ed | 169 | static struct acpi_ipmi_device *acpi_ipmi_dev_get(void) |
a1a69b29 | 170 | { |
e96a94ed | 171 | struct acpi_ipmi_device *ipmi_device = NULL; |
a1a69b29 LZ |
172 | |
173 | mutex_lock(&driver_data.ipmi_lock); | |
e96a94ed LZ |
174 | if (driver_data.selected_smi) { |
175 | ipmi_device = driver_data.selected_smi; | |
176 | kref_get(&ipmi_device->kref); | |
a1a69b29 LZ |
177 | } |
178 | mutex_unlock(&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(&ipmi_device->kref, ipmi_dev_release_kref); | |
186 | } | |
187 | ||
7b984477 | 188 | static struct acpi_ipmi_msg *ipmi_msg_alloc(void) |
e92b297c | 189 | { |
7b984477 | 190 | struct acpi_ipmi_device *ipmi; |
e92b297c | 191 | struct acpi_ipmi_msg *ipmi_msg; |
e92b297c | 192 | |
7b984477 LZ |
193 | ipmi = acpi_ipmi_dev_get(); |
194 | if (!ipmi) | |
195 | return NULL; | |
50065300 | 196 | |
e92b297c | 197 | ipmi_msg = kzalloc(sizeof(struct acpi_ipmi_msg), GFP_KERNEL); |
7b984477 LZ |
198 | if (!ipmi_msg) { |
199 | acpi_ipmi_dev_put(ipmi); | |
e92b297c ZY |
200 | return NULL; |
201 | } | |
50065300 | 202 | |
7b984477 | 203 | kref_init(&ipmi_msg->kref); |
e92b297c ZY |
204 | init_completion(&ipmi_msg->tx_complete); |
205 | INIT_LIST_HEAD(&ipmi_msg->head); | |
206 | ipmi_msg->device = ipmi; | |
8584ec6a | 207 | ipmi_msg->msg_done = ACPI_IPMI_UNKNOWN; |
50065300 | 208 | |
e92b297c ZY |
209 | return ipmi_msg; |
210 | } | |
211 | ||
7b984477 LZ |
212 | static void ipmi_msg_release(struct acpi_ipmi_msg *tx_msg) |
213 | { | |
214 | acpi_ipmi_dev_put(tx_msg->device); | |
215 | kfree(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(&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(&tx_msg->kref, ipmi_msg_release_kref); | |
236 | } | |
237 | ||
50065300 LZ |
238 | #define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff) |
239 | #define IPMI_OP_RGN_CMD(offset) (offset & 0xff) | |
6b68f03f | 240 | static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg, |
50065300 LZ |
241 | acpi_physical_address address, |
242 | acpi_integer *value) | |
e92b297c ZY |
243 | { |
244 | struct kernel_ipmi_msg *msg; | |
245 | struct acpi_ipmi_buffer *buffer; | |
246 | struct acpi_ipmi_device *device; | |
06a8566b | 247 | unsigned long flags; |
e92b297c ZY |
248 | |
249 | msg = &tx_msg->tx_message; | |
50065300 | 250 | |
e92b297c ZY |
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); | |
6b68f03f | 257 | msg->data = tx_msg->data; |
50065300 | 258 | |
e92b297c ZY |
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; | |
50065300 | 264 | |
e92b297c | 265 | /* copy the tx message data */ |
6b68f03f | 266 | if (buffer->length > ACPI_IPMI_MAX_MSG_LENGTH) { |
2fb037b8 | 267 | dev_WARN_ONCE(tx_msg->device->dev, true, |
6b68f03f LZ |
268 | "Unexpected request (msg len %d).\n", |
269 | buffer->length); | |
270 | return -EINVAL; | |
271 | } | |
e92b297c | 272 | msg->data_len = buffer->length; |
6b68f03f | 273 | memcpy(tx_msg->data, buffer->data, msg->data_len); |
50065300 | 274 | |
e92b297c ZY |
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; | |
50065300 | 288 | |
06a8566b | 289 | spin_lock_irqsave(&device->tx_msg_lock, flags); |
e92b297c ZY |
290 | device->curr_msgid++; |
291 | tx_msg->tx_msgid = device->curr_msgid; | |
06a8566b | 292 | spin_unlock_irqrestore(&device->tx_msg_lock, flags); |
50065300 | 293 | |
6b68f03f | 294 | return 0; |
e92b297c ZY |
295 | } |
296 | ||
297 | static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg, | |
50065300 | 298 | acpi_integer *value) |
e92b297c ZY |
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; | |
50065300 | 307 | |
e92b297c | 308 | /* |
8584ec6a LZ |
309 | * If the flag of msg_done is not set, it means that the IPMI command is |
310 | * not executed correctly. | |
e92b297c | 311 | */ |
8584ec6a LZ |
312 | buffer->status = msg->msg_done; |
313 | if (msg->msg_done != ACPI_IPMI_OK) | |
e92b297c | 314 | return; |
50065300 | 315 | |
e92b297c ZY |
316 | /* |
317 | * If the IPMI response message is obtained correctly, the status code | |
318 | * will be ACPI_IPMI_OK | |
319 | */ | |
e92b297c | 320 | buffer->length = msg->rx_len; |
6b68f03f | 321 | memcpy(buffer->data, msg->data, msg->rx_len); |
e92b297c ZY |
322 | } |
323 | ||
324 | static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi) | |
325 | { | |
7b984477 | 326 | struct acpi_ipmi_msg *tx_msg; |
5ac557ef | 327 | unsigned long flags; |
e92b297c | 328 | |
a1a69b29 LZ |
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 | */ | |
5ac557ef | 337 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
7b984477 LZ |
338 | while (!list_empty(&ipmi->tx_msg_list)) { |
339 | tx_msg = list_first_entry(&ipmi->tx_msg_list, | |
340 | struct acpi_ipmi_msg, | |
341 | head); | |
342 | list_del(&tx_msg->head); | |
343 | spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); | |
344 | ||
e92b297c ZY |
345 | /* wake up the sleep thread on the Tx msg */ |
346 | complete(&tx_msg->tx_complete); | |
7b984477 LZ |
347 | acpi_ipmi_msg_put(tx_msg); |
348 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); | |
349 | } | |
350 | spin_unlock_irqrestore(&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, *temp; | |
357 | bool msg_found = false; | |
358 | unsigned long flags; | |
359 | ||
360 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); | |
361 | list_for_each_entry_safe(tx_msg, temp, &ipmi->tx_msg_list, head) { | |
362 | if (msg == tx_msg) { | |
363 | msg_found = true; | |
364 | list_del(&tx_msg->head); | |
365 | break; | |
366 | } | |
e92b297c | 367 | } |
5ac557ef | 368 | spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); |
7b984477 LZ |
369 | |
370 | if (msg_found) | |
371 | acpi_ipmi_msg_put(tx_msg); | |
e92b297c ZY |
372 | } |
373 | ||
374 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) | |
375 | { | |
376 | struct acpi_ipmi_device *ipmi_device = user_msg_data; | |
7b984477 LZ |
377 | bool msg_found = false; |
378 | struct acpi_ipmi_msg *tx_msg, *temp; | |
2fb037b8 | 379 | struct device *dev = ipmi_device->dev; |
06a8566b | 380 | unsigned long flags; |
e92b297c ZY |
381 | |
382 | if (msg->user != ipmi_device->user_interface) { | |
50065300 LZ |
383 | dev_warn(dev, |
384 | "Unexpected response is returned. returned user %p, expected user %p\n", | |
385 | msg->user, ipmi_device->user_interface); | |
6b68f03f | 386 | goto out_msg; |
e92b297c | 387 | } |
50065300 | 388 | |
06a8566b | 389 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
7b984477 | 390 | list_for_each_entry_safe(tx_msg, temp, &ipmi_device->tx_msg_list, head) { |
e92b297c | 391 | if (msg->msgid == tx_msg->tx_msgid) { |
7b984477 LZ |
392 | msg_found = true; |
393 | list_del(&tx_msg->head); | |
e92b297c ZY |
394 | break; |
395 | } | |
396 | } | |
7b984477 | 397 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
e92b297c | 398 | |
e92b297c | 399 | if (!msg_found) { |
50065300 LZ |
400 | dev_warn(dev, |
401 | "Unexpected response (msg id %ld) is returned.\n", | |
402 | msg->msgid); | |
7b984477 | 403 | goto out_msg; |
e92b297c ZY |
404 | } |
405 | ||
6b68f03f LZ |
406 | /* copy the response data to Rx_data buffer */ |
407 | if (msg->msg.data_len > ACPI_IPMI_MAX_MSG_LENGTH) { | |
2fb037b8 | 408 | dev_WARN_ONCE(dev, true, |
6b68f03f LZ |
409 | "Unexpected response (msg len %d).\n", |
410 | msg->msg.data_len); | |
8584ec6a | 411 | goto out_comp; |
e92b297c | 412 | } |
50065300 | 413 | |
8584ec6a LZ |
414 | /* response msg is an error msg */ |
415 | msg->recv_type = IPMI_RESPONSE_RECV_TYPE; | |
416 | if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE && | |
417 | msg->msg.data_len == 1) { | |
418 | if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) { | |
f5135614 | 419 | dev_dbg_once(dev, "Unexpected response (timeout).\n"); |
8584ec6a LZ |
420 | tx_msg->msg_done = ACPI_IPMI_TIMEOUT; |
421 | } | |
422 | goto out_comp; | |
423 | } | |
50065300 | 424 | |
8584ec6a LZ |
425 | tx_msg->rx_len = msg->msg.data_len; |
426 | memcpy(tx_msg->data, msg->msg.data, tx_msg->rx_len); | |
427 | tx_msg->msg_done = ACPI_IPMI_OK; | |
50065300 | 428 | |
8584ec6a | 429 | out_comp: |
e92b297c | 430 | complete(&tx_msg->tx_complete); |
7b984477 | 431 | acpi_ipmi_msg_put(tx_msg); |
6b68f03f | 432 | out_msg: |
e92b297c | 433 | ipmi_free_recv_msg(msg); |
50065300 | 434 | } |
e92b297c ZY |
435 | |
436 | static void ipmi_register_bmc(int iface, struct device *dev) | |
437 | { | |
438 | struct acpi_ipmi_device *ipmi_device, *temp; | |
e92b297c ZY |
439 | int err; |
440 | struct ipmi_smi_info smi_data; | |
441 | acpi_handle handle; | |
442 | ||
443 | err = ipmi_get_smi_info(iface, &smi_data); | |
e92b297c ZY |
444 | if (err) |
445 | return; | |
446 | ||
a1a69b29 LZ |
447 | if (smi_data.addr_src != SI_ACPI) |
448 | goto err_ref; | |
e92b297c | 449 | handle = smi_data.addr_info.acpi_info.acpi_handle; |
a1a69b29 LZ |
450 | if (!handle) |
451 | goto err_ref; | |
a1a69b29 | 452 | |
2fb037b8 | 453 | ipmi_device = ipmi_dev_alloc(iface, smi_data.dev, handle); |
a1a69b29 | 454 | if (!ipmi_device) { |
2fb037b8 | 455 | dev_warn(smi_data.dev, "Can't create IPMI user interface\n"); |
a1a69b29 LZ |
456 | goto err_ref; |
457 | } | |
e92b297c ZY |
458 | |
459 | mutex_lock(&driver_data.ipmi_lock); | |
460 | list_for_each_entry(temp, &driver_data.ipmi_devices, head) { | |
461 | /* | |
462 | * if the corresponding ACPI handle is already added | |
463 | * to the device list, don't add it again. | |
464 | */ | |
465 | if (temp->handle == handle) | |
a1a69b29 | 466 | goto err_lock; |
e92b297c | 467 | } |
e96a94ed LZ |
468 | if (!driver_data.selected_smi) |
469 | driver_data.selected_smi = ipmi_device; | |
a1a69b29 | 470 | list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices); |
e92b297c | 471 | mutex_unlock(&driver_data.ipmi_lock); |
50065300 | 472 | |
a1a69b29 | 473 | put_device(smi_data.dev); |
e92b297c ZY |
474 | return; |
475 | ||
a1a69b29 | 476 | err_lock: |
e92b297c | 477 | mutex_unlock(&driver_data.ipmi_lock); |
a1a69b29 LZ |
478 | ipmi_dev_release(ipmi_device); |
479 | err_ref: | |
e92b297c | 480 | put_device(smi_data.dev); |
e92b297c ZY |
481 | } |
482 | ||
483 | static void ipmi_bmc_gone(int iface) | |
484 | { | |
485 | struct acpi_ipmi_device *ipmi_device, *temp; | |
a1a69b29 | 486 | bool dev_found = false; |
e92b297c ZY |
487 | |
488 | mutex_lock(&driver_data.ipmi_lock); | |
489 | list_for_each_entry_safe(ipmi_device, temp, | |
50065300 | 490 | &driver_data.ipmi_devices, head) { |
a1a69b29 LZ |
491 | if (ipmi_device->ipmi_ifnum != iface) { |
492 | dev_found = true; | |
493 | __ipmi_dev_kill(ipmi_device); | |
494 | break; | |
495 | } | |
e92b297c | 496 | } |
e96a94ed LZ |
497 | if (!driver_data.selected_smi) |
498 | driver_data.selected_smi = list_first_entry_or_null( | |
499 | &driver_data.ipmi_devices, | |
500 | struct acpi_ipmi_device, head); | |
e92b297c | 501 | mutex_unlock(&driver_data.ipmi_lock); |
50065300 | 502 | |
a1a69b29 LZ |
503 | if (dev_found) { |
504 | ipmi_flush_tx_msg(ipmi_device); | |
505 | acpi_ipmi_dev_put(ipmi_device); | |
506 | } | |
e92b297c | 507 | } |
50065300 | 508 | |
e92b297c ZY |
509 | /* |
510 | * This is the IPMI opregion space handler. | |
511 | * @function: indicates the read/write. In fact as the IPMI message is driven | |
512 | * by command, only write is meaningful. | |
513 | * @address: This contains the netfn/command of IPMI request message. | |
514 | * @bits : not used. | |
515 | * @value : it is an in/out parameter. It points to the IPMI message buffer. | |
516 | * Before the IPMI message is sent, it represents the actual request | |
517 | * IPMI message. After the IPMI message is finished, it represents | |
518 | * the response IPMI message returned by IPMI command. | |
519 | * @handler_context: IPMI device context. | |
520 | */ | |
e92b297c ZY |
521 | static acpi_status |
522 | acpi_ipmi_space_handler(u32 function, acpi_physical_address address, | |
50065300 LZ |
523 | u32 bits, acpi_integer *value, |
524 | void *handler_context, void *region_context) | |
e92b297c ZY |
525 | { |
526 | struct acpi_ipmi_msg *tx_msg; | |
a1a69b29 | 527 | struct acpi_ipmi_device *ipmi_device; |
8584ec6a | 528 | int err; |
e92b297c | 529 | acpi_status status; |
06a8566b | 530 | unsigned long flags; |
50065300 | 531 | |
e92b297c ZY |
532 | /* |
533 | * IPMI opregion message. | |
534 | * IPMI message is firstly written to the BMC and system software | |
535 | * can get the respsonse. So it is unmeaningful for the read access | |
536 | * of IPMI opregion. | |
537 | */ | |
538 | if ((function & ACPI_IO_MASK) == ACPI_READ) | |
539 | return AE_TYPE; | |
540 | ||
7b984477 LZ |
541 | tx_msg = ipmi_msg_alloc(); |
542 | if (!tx_msg) | |
e92b297c | 543 | return AE_NOT_EXIST; |
7b984477 | 544 | ipmi_device = tx_msg->device; |
e92b297c | 545 | |
6b68f03f | 546 | if (acpi_format_ipmi_request(tx_msg, address, value) != 0) { |
7b984477 LZ |
547 | ipmi_msg_release(tx_msg); |
548 | return AE_TYPE; | |
6b68f03f | 549 | } |
50065300 | 550 | |
7b984477 | 551 | acpi_ipmi_msg_get(tx_msg); |
a1a69b29 LZ |
552 | mutex_lock(&driver_data.ipmi_lock); |
553 | /* Do not add a tx_msg that can not be flushed. */ | |
554 | if (ipmi_device->dead) { | |
a1a69b29 | 555 | mutex_unlock(&driver_data.ipmi_lock); |
7b984477 LZ |
556 | ipmi_msg_release(tx_msg); |
557 | return AE_NOT_EXIST; | |
a1a69b29 | 558 | } |
06a8566b | 559 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
e92b297c | 560 | list_add_tail(&tx_msg->head, &ipmi_device->tx_msg_list); |
06a8566b | 561 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
a1a69b29 | 562 | mutex_unlock(&driver_data.ipmi_lock); |
50065300 | 563 | |
e92b297c | 564 | err = ipmi_request_settime(ipmi_device->user_interface, |
50065300 LZ |
565 | &tx_msg->addr, |
566 | tx_msg->tx_msgid, | |
567 | &tx_msg->tx_message, | |
568 | NULL, 0, 0, IPMI_TIMEOUT); | |
e92b297c ZY |
569 | if (err) { |
570 | status = AE_ERROR; | |
7b984477 | 571 | goto out_msg; |
e92b297c | 572 | } |
8584ec6a | 573 | wait_for_completion(&tx_msg->tx_complete); |
50065300 | 574 | |
8584ec6a | 575 | acpi_format_ipmi_response(tx_msg, value); |
e92b297c ZY |
576 | status = AE_OK; |
577 | ||
6b68f03f | 578 | out_msg: |
7b984477 LZ |
579 | ipmi_cancel_tx_msg(ipmi_device, tx_msg); |
580 | acpi_ipmi_msg_put(tx_msg); | |
e92b297c ZY |
581 | return status; |
582 | } | |
583 | ||
e92b297c ZY |
584 | static int __init acpi_ipmi_init(void) |
585 | { | |
a194aa43 | 586 | int result; |
e96a94ed | 587 | acpi_status status; |
e92b297c ZY |
588 | |
589 | if (acpi_disabled) | |
a194aa43 | 590 | return 0; |
e92b297c | 591 | |
e96a94ed | 592 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, |
50065300 LZ |
593 | ACPI_ADR_SPACE_IPMI, |
594 | &acpi_ipmi_space_handler, | |
595 | NULL, NULL); | |
e96a94ed LZ |
596 | if (ACPI_FAILURE(status)) { |
597 | pr_warn("Can't register IPMI opregion space handle\n"); | |
598 | return -EINVAL; | |
599 | } | |
64887bbd | 600 | |
e92b297c | 601 | result = ipmi_smi_watcher_register(&driver_data.bmc_events); |
64887bbd HG |
602 | if (result) { |
603 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, | |
604 | ACPI_ADR_SPACE_IPMI, | |
605 | &acpi_ipmi_space_handler); | |
e96a94ed | 606 | pr_err("Can't register IPMI system interface watcher\n"); |
64887bbd | 607 | } |
e92b297c ZY |
608 | |
609 | return result; | |
610 | } | |
611 | ||
612 | static void __exit acpi_ipmi_exit(void) | |
613 | { | |
a1a69b29 | 614 | struct acpi_ipmi_device *ipmi_device; |
e92b297c ZY |
615 | |
616 | if (acpi_disabled) | |
617 | return; | |
618 | ||
619 | ipmi_smi_watcher_unregister(&driver_data.bmc_events); | |
620 | ||
621 | /* | |
622 | * When one smi_watcher is unregistered, it is only deleted | |
623 | * from the smi_watcher list. But the smi_gone callback function | |
624 | * is not called. So explicitly uninstall the ACPI IPMI oregion | |
625 | * handler and free it. | |
626 | */ | |
627 | mutex_lock(&driver_data.ipmi_lock); | |
a1a69b29 LZ |
628 | while (!list_empty(&driver_data.ipmi_devices)) { |
629 | ipmi_device = list_first_entry(&driver_data.ipmi_devices, | |
630 | struct acpi_ipmi_device, | |
631 | head); | |
632 | __ipmi_dev_kill(ipmi_device); | |
633 | mutex_unlock(&driver_data.ipmi_lock); | |
634 | ||
635 | ipmi_flush_tx_msg(ipmi_device); | |
636 | acpi_ipmi_dev_put(ipmi_device); | |
637 | ||
638 | mutex_lock(&driver_data.ipmi_lock); | |
e92b297c ZY |
639 | } |
640 | mutex_unlock(&driver_data.ipmi_lock); | |
e96a94ed | 641 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50065300 LZ |
642 | ACPI_ADR_SPACE_IPMI, |
643 | &acpi_ipmi_space_handler); | |
e92b297c ZY |
644 | } |
645 | ||
646 | module_init(acpi_ipmi_init); | |
647 | module_exit(acpi_ipmi_exit); |