Commit | Line | Data |
---|---|---|
e92b297c ZY |
1 | /* |
2 | * acpi_ipmi.c - ACPI IPMI opregion | |
3 | * | |
a1a69b29 LZ |
4 | * Copyright (C) 2010, 2013 Intel Corporation |
5 | * Author: Zhao Yakui <yakui.zhao@intel.com> | |
6 | * Lv Zheng <lv.zheng@intel.com> | |
e92b297c ZY |
7 | * |
8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or (at | |
13 | * your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License along | |
21 | * with this program; if not, write to the Free Software Foundation, Inc., | |
22 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
23 | * | |
24 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
25 | */ | |
26 | ||
e92b297c | 27 | #include <linux/module.h> |
935a9e3f | 28 | #include <linux/acpi.h> |
e92b297c | 29 | #include <linux/ipmi.h> |
06a8566b | 30 | #include <linux/spinlock.h> |
e92b297c ZY |
31 | |
32 | MODULE_AUTHOR("Zhao Yakui"); | |
33 | MODULE_DESCRIPTION("ACPI IPMI Opregion driver"); | |
34 | MODULE_LICENSE("GPL"); | |
35 | ||
e92b297c ZY |
36 | #define ACPI_IPMI_OK 0 |
37 | #define ACPI_IPMI_TIMEOUT 0x10 | |
38 | #define ACPI_IPMI_UNKNOWN 0x07 | |
39 | /* the IPMI timeout is 5s */ | |
8584ec6a | 40 | #define IPMI_TIMEOUT (5000) |
6b68f03f | 41 | #define ACPI_IPMI_MAX_MSG_LENGTH 64 |
e92b297c ZY |
42 | |
43 | struct acpi_ipmi_device { | |
44 | /* the device list attached to driver_data.ipmi_devices */ | |
45 | struct list_head head; | |
50065300 | 46 | |
e92b297c ZY |
47 | /* the IPMI request message list */ |
48 | struct list_head tx_msg_list; | |
50065300 LZ |
49 | |
50 | spinlock_t tx_msg_lock; | |
e92b297c | 51 | acpi_handle handle; |
2fb037b8 | 52 | struct device *dev; |
50065300 | 53 | ipmi_user_t user_interface; |
e92b297c ZY |
54 | int ipmi_ifnum; /* IPMI interface number */ |
55 | long curr_msgid; | |
a1a69b29 LZ |
56 | bool dead; |
57 | struct kref kref; | |
e92b297c ZY |
58 | }; |
59 | ||
60 | struct ipmi_driver_data { | |
50065300 LZ |
61 | struct list_head ipmi_devices; |
62 | struct ipmi_smi_watcher bmc_events; | |
63 | struct ipmi_user_hndl ipmi_hndlrs; | |
64 | struct mutex ipmi_lock; | |
65 | ||
e96a94ed LZ |
66 | /* |
67 | * NOTE: IPMI System Interface Selection | |
68 | * There is no system interface specified by the IPMI operation | |
69 | * region access. We try to select one system interface with ACPI | |
70 | * handle set. IPMI messages passed from the ACPI codes are sent | |
71 | * to this selected global IPMI system interface. | |
72 | */ | |
73 | struct acpi_ipmi_device *selected_smi; | |
e92b297c ZY |
74 | }; |
75 | ||
76 | struct acpi_ipmi_msg { | |
77 | struct list_head head; | |
50065300 | 78 | |
e92b297c ZY |
79 | /* |
80 | * General speaking the addr type should be SI_ADDR_TYPE. And | |
81 | * the addr channel should be BMC. | |
82 | * In fact it can also be IPMB type. But we will have to | |
83 | * parse it from the Netfn command buffer. It is so complex | |
84 | * that it is skipped. | |
85 | */ | |
86 | struct ipmi_addr addr; | |
87 | long tx_msgid; | |
50065300 | 88 | |
e92b297c ZY |
89 | /* it is used to track whether the IPMI message is finished */ |
90 | struct completion tx_complete; | |
50065300 | 91 | |
e92b297c | 92 | struct kernel_ipmi_msg tx_message; |
50065300 LZ |
93 | int msg_done; |
94 | ||
6b68f03f | 95 | /* tx/rx data . And copy it from/to ACPI object buffer */ |
50065300 LZ |
96 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
97 | u8 rx_len; | |
98 | ||
e92b297c | 99 | struct acpi_ipmi_device *device; |
50065300 | 100 | struct kref kref; |
e92b297c ZY |
101 | }; |
102 | ||
103 | /* IPMI request/response buffer per ACPI 4.0, sec 5.5.2.4.3.2 */ | |
104 | struct acpi_ipmi_buffer { | |
105 | u8 status; | |
106 | u8 length; | |
6b68f03f | 107 | u8 data[ACPI_IPMI_MAX_MSG_LENGTH]; |
e92b297c ZY |
108 | }; |
109 | ||
110 | static void ipmi_register_bmc(int iface, struct device *dev); | |
111 | static void ipmi_bmc_gone(int iface); | |
112 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); | |
e92b297c ZY |
113 | |
114 | static struct ipmi_driver_data driver_data = { | |
115 | .ipmi_devices = LIST_HEAD_INIT(driver_data.ipmi_devices), | |
116 | .bmc_events = { | |
117 | .owner = THIS_MODULE, | |
118 | .new_smi = ipmi_register_bmc, | |
119 | .smi_gone = ipmi_bmc_gone, | |
120 | }, | |
121 | .ipmi_hndlrs = { | |
122 | .ipmi_recv_hndl = ipmi_msg_handler, | |
123 | }, | |
a194aa43 | 124 | .ipmi_lock = __MUTEX_INITIALIZER(driver_data.ipmi_lock) |
e92b297c ZY |
125 | }; |
126 | ||
a1a69b29 | 127 | static struct acpi_ipmi_device * |
2fb037b8 | 128 | ipmi_dev_alloc(int iface, struct device *dev, acpi_handle handle) |
a1a69b29 LZ |
129 | { |
130 | struct acpi_ipmi_device *ipmi_device; | |
131 | int err; | |
132 | ipmi_user_t user; | |
133 | ||
134 | ipmi_device = kzalloc(sizeof(*ipmi_device), GFP_KERNEL); | |
135 | if (!ipmi_device) | |
136 | return NULL; | |
137 | ||
138 | kref_init(&ipmi_device->kref); | |
139 | INIT_LIST_HEAD(&ipmi_device->head); | |
140 | INIT_LIST_HEAD(&ipmi_device->tx_msg_list); | |
141 | spin_lock_init(&ipmi_device->tx_msg_lock); | |
a1a69b29 | 142 | ipmi_device->handle = handle; |
2fb037b8 | 143 | ipmi_device->dev = get_device(dev); |
a1a69b29 LZ |
144 | ipmi_device->ipmi_ifnum = iface; |
145 | ||
146 | err = ipmi_create_user(iface, &driver_data.ipmi_hndlrs, | |
147 | ipmi_device, &user); | |
148 | if (err) { | |
2fb037b8 | 149 | put_device(dev); |
a1a69b29 LZ |
150 | kfree(ipmi_device); |
151 | return NULL; | |
152 | } | |
153 | ipmi_device->user_interface = user; | |
a1a69b29 LZ |
154 | |
155 | return ipmi_device; | |
156 | } | |
157 | ||
158 | static void ipmi_dev_release(struct acpi_ipmi_device *ipmi_device) | |
159 | { | |
a1a69b29 | 160 | ipmi_destroy_user(ipmi_device->user_interface); |
2fb037b8 | 161 | put_device(ipmi_device->dev); |
a1a69b29 LZ |
162 | kfree(ipmi_device); |
163 | } | |
164 | ||
165 | static void ipmi_dev_release_kref(struct kref *kref) | |
166 | { | |
167 | struct acpi_ipmi_device *ipmi = | |
168 | container_of(kref, struct acpi_ipmi_device, kref); | |
169 | ||
170 | ipmi_dev_release(ipmi); | |
171 | } | |
172 | ||
173 | static void __ipmi_dev_kill(struct acpi_ipmi_device *ipmi_device) | |
174 | { | |
175 | list_del(&ipmi_device->head); | |
e96a94ed LZ |
176 | if (driver_data.selected_smi == ipmi_device) |
177 | driver_data.selected_smi = NULL; | |
50065300 | 178 | |
a1a69b29 LZ |
179 | /* |
180 | * Always setting dead flag after deleting from the list or | |
181 | * list_for_each_entry() codes must get changed. | |
182 | */ | |
183 | ipmi_device->dead = true; | |
184 | } | |
185 | ||
e96a94ed | 186 | static struct acpi_ipmi_device *acpi_ipmi_dev_get(void) |
a1a69b29 | 187 | { |
e96a94ed | 188 | struct acpi_ipmi_device *ipmi_device = NULL; |
a1a69b29 LZ |
189 | |
190 | mutex_lock(&driver_data.ipmi_lock); | |
e96a94ed LZ |
191 | if (driver_data.selected_smi) { |
192 | ipmi_device = driver_data.selected_smi; | |
193 | kref_get(&ipmi_device->kref); | |
a1a69b29 LZ |
194 | } |
195 | mutex_unlock(&driver_data.ipmi_lock); | |
196 | ||
197 | return ipmi_device; | |
198 | } | |
199 | ||
200 | static void acpi_ipmi_dev_put(struct acpi_ipmi_device *ipmi_device) | |
201 | { | |
202 | kref_put(&ipmi_device->kref, ipmi_dev_release_kref); | |
203 | } | |
204 | ||
7b984477 | 205 | static struct acpi_ipmi_msg *ipmi_msg_alloc(void) |
e92b297c | 206 | { |
7b984477 | 207 | struct acpi_ipmi_device *ipmi; |
e92b297c | 208 | struct acpi_ipmi_msg *ipmi_msg; |
e92b297c | 209 | |
7b984477 LZ |
210 | ipmi = acpi_ipmi_dev_get(); |
211 | if (!ipmi) | |
212 | return NULL; | |
50065300 | 213 | |
e92b297c | 214 | ipmi_msg = kzalloc(sizeof(struct acpi_ipmi_msg), GFP_KERNEL); |
7b984477 LZ |
215 | if (!ipmi_msg) { |
216 | acpi_ipmi_dev_put(ipmi); | |
e92b297c ZY |
217 | return NULL; |
218 | } | |
50065300 | 219 | |
7b984477 | 220 | kref_init(&ipmi_msg->kref); |
e92b297c ZY |
221 | init_completion(&ipmi_msg->tx_complete); |
222 | INIT_LIST_HEAD(&ipmi_msg->head); | |
223 | ipmi_msg->device = ipmi; | |
8584ec6a | 224 | ipmi_msg->msg_done = ACPI_IPMI_UNKNOWN; |
50065300 | 225 | |
e92b297c ZY |
226 | return ipmi_msg; |
227 | } | |
228 | ||
7b984477 LZ |
229 | static void ipmi_msg_release(struct acpi_ipmi_msg *tx_msg) |
230 | { | |
231 | acpi_ipmi_dev_put(tx_msg->device); | |
232 | kfree(tx_msg); | |
233 | } | |
234 | ||
235 | static void ipmi_msg_release_kref(struct kref *kref) | |
236 | { | |
237 | struct acpi_ipmi_msg *tx_msg = | |
238 | container_of(kref, struct acpi_ipmi_msg, kref); | |
239 | ||
240 | ipmi_msg_release(tx_msg); | |
241 | } | |
242 | ||
243 | static struct acpi_ipmi_msg *acpi_ipmi_msg_get(struct acpi_ipmi_msg *tx_msg) | |
244 | { | |
245 | kref_get(&tx_msg->kref); | |
246 | ||
247 | return tx_msg; | |
248 | } | |
249 | ||
250 | static void acpi_ipmi_msg_put(struct acpi_ipmi_msg *tx_msg) | |
251 | { | |
252 | kref_put(&tx_msg->kref, ipmi_msg_release_kref); | |
253 | } | |
254 | ||
50065300 LZ |
255 | #define IPMI_OP_RGN_NETFN(offset) ((offset >> 8) & 0xff) |
256 | #define IPMI_OP_RGN_CMD(offset) (offset & 0xff) | |
6b68f03f | 257 | static int acpi_format_ipmi_request(struct acpi_ipmi_msg *tx_msg, |
50065300 LZ |
258 | acpi_physical_address address, |
259 | acpi_integer *value) | |
e92b297c ZY |
260 | { |
261 | struct kernel_ipmi_msg *msg; | |
262 | struct acpi_ipmi_buffer *buffer; | |
263 | struct acpi_ipmi_device *device; | |
06a8566b | 264 | unsigned long flags; |
e92b297c ZY |
265 | |
266 | msg = &tx_msg->tx_message; | |
50065300 | 267 | |
e92b297c ZY |
268 | /* |
269 | * IPMI network function and command are encoded in the address | |
270 | * within the IPMI OpRegion; see ACPI 4.0, sec 5.5.2.4.3. | |
271 | */ | |
272 | msg->netfn = IPMI_OP_RGN_NETFN(address); | |
273 | msg->cmd = IPMI_OP_RGN_CMD(address); | |
6b68f03f | 274 | msg->data = tx_msg->data; |
50065300 | 275 | |
e92b297c ZY |
276 | /* |
277 | * value is the parameter passed by the IPMI opregion space handler. | |
278 | * It points to the IPMI request message buffer | |
279 | */ | |
280 | buffer = (struct acpi_ipmi_buffer *)value; | |
50065300 | 281 | |
e92b297c | 282 | /* copy the tx message data */ |
6b68f03f | 283 | if (buffer->length > ACPI_IPMI_MAX_MSG_LENGTH) { |
2fb037b8 | 284 | dev_WARN_ONCE(tx_msg->device->dev, true, |
6b68f03f LZ |
285 | "Unexpected request (msg len %d).\n", |
286 | buffer->length); | |
287 | return -EINVAL; | |
288 | } | |
e92b297c | 289 | msg->data_len = buffer->length; |
6b68f03f | 290 | memcpy(tx_msg->data, buffer->data, msg->data_len); |
50065300 | 291 | |
e92b297c ZY |
292 | /* |
293 | * now the default type is SYSTEM_INTERFACE and channel type is BMC. | |
294 | * If the netfn is APP_REQUEST and the cmd is SEND_MESSAGE, | |
295 | * the addr type should be changed to IPMB. Then we will have to parse | |
296 | * the IPMI request message buffer to get the IPMB address. | |
297 | * If so, please fix me. | |
298 | */ | |
299 | tx_msg->addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
300 | tx_msg->addr.channel = IPMI_BMC_CHANNEL; | |
301 | tx_msg->addr.data[0] = 0; | |
302 | ||
303 | /* Get the msgid */ | |
304 | device = tx_msg->device; | |
50065300 | 305 | |
06a8566b | 306 | spin_lock_irqsave(&device->tx_msg_lock, flags); |
e92b297c ZY |
307 | device->curr_msgid++; |
308 | tx_msg->tx_msgid = device->curr_msgid; | |
06a8566b | 309 | spin_unlock_irqrestore(&device->tx_msg_lock, flags); |
50065300 | 310 | |
6b68f03f | 311 | return 0; |
e92b297c ZY |
312 | } |
313 | ||
314 | static void acpi_format_ipmi_response(struct acpi_ipmi_msg *msg, | |
50065300 | 315 | acpi_integer *value) |
e92b297c ZY |
316 | { |
317 | struct acpi_ipmi_buffer *buffer; | |
318 | ||
319 | /* | |
320 | * value is also used as output parameter. It represents the response | |
321 | * IPMI message returned by IPMI command. | |
322 | */ | |
323 | buffer = (struct acpi_ipmi_buffer *)value; | |
50065300 | 324 | |
e92b297c | 325 | /* |
8584ec6a LZ |
326 | * If the flag of msg_done is not set, it means that the IPMI command is |
327 | * not executed correctly. | |
e92b297c | 328 | */ |
8584ec6a LZ |
329 | buffer->status = msg->msg_done; |
330 | if (msg->msg_done != ACPI_IPMI_OK) | |
e92b297c | 331 | return; |
50065300 | 332 | |
e92b297c ZY |
333 | /* |
334 | * If the IPMI response message is obtained correctly, the status code | |
335 | * will be ACPI_IPMI_OK | |
336 | */ | |
e92b297c | 337 | buffer->length = msg->rx_len; |
6b68f03f | 338 | memcpy(buffer->data, msg->data, msg->rx_len); |
e92b297c ZY |
339 | } |
340 | ||
341 | static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi) | |
342 | { | |
7b984477 | 343 | struct acpi_ipmi_msg *tx_msg; |
5ac557ef | 344 | unsigned long flags; |
e92b297c | 345 | |
a1a69b29 LZ |
346 | /* |
347 | * NOTE: On-going ipmi_recv_msg | |
348 | * ipmi_msg_handler() may still be invoked by ipmi_si after | |
349 | * flushing. But it is safe to do a fast flushing on module_exit() | |
350 | * without waiting for all ipmi_recv_msg(s) to complete from | |
351 | * ipmi_msg_handler() as it is ensured by ipmi_si that all | |
352 | * ipmi_recv_msg(s) are freed after invoking ipmi_destroy_user(). | |
353 | */ | |
5ac557ef | 354 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); |
7b984477 LZ |
355 | while (!list_empty(&ipmi->tx_msg_list)) { |
356 | tx_msg = list_first_entry(&ipmi->tx_msg_list, | |
357 | struct acpi_ipmi_msg, | |
358 | head); | |
359 | list_del(&tx_msg->head); | |
360 | spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); | |
361 | ||
e92b297c ZY |
362 | /* wake up the sleep thread on the Tx msg */ |
363 | complete(&tx_msg->tx_complete); | |
7b984477 LZ |
364 | acpi_ipmi_msg_put(tx_msg); |
365 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); | |
366 | } | |
367 | spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); | |
368 | } | |
369 | ||
370 | static void ipmi_cancel_tx_msg(struct acpi_ipmi_device *ipmi, | |
371 | struct acpi_ipmi_msg *msg) | |
372 | { | |
373 | struct acpi_ipmi_msg *tx_msg, *temp; | |
374 | bool msg_found = false; | |
375 | unsigned long flags; | |
376 | ||
377 | spin_lock_irqsave(&ipmi->tx_msg_lock, flags); | |
378 | list_for_each_entry_safe(tx_msg, temp, &ipmi->tx_msg_list, head) { | |
379 | if (msg == tx_msg) { | |
380 | msg_found = true; | |
381 | list_del(&tx_msg->head); | |
382 | break; | |
383 | } | |
e92b297c | 384 | } |
5ac557ef | 385 | spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags); |
7b984477 LZ |
386 | |
387 | if (msg_found) | |
388 | acpi_ipmi_msg_put(tx_msg); | |
e92b297c ZY |
389 | } |
390 | ||
391 | static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) | |
392 | { | |
393 | struct acpi_ipmi_device *ipmi_device = user_msg_data; | |
7b984477 LZ |
394 | bool msg_found = false; |
395 | struct acpi_ipmi_msg *tx_msg, *temp; | |
2fb037b8 | 396 | struct device *dev = ipmi_device->dev; |
06a8566b | 397 | unsigned long flags; |
e92b297c ZY |
398 | |
399 | if (msg->user != ipmi_device->user_interface) { | |
50065300 LZ |
400 | dev_warn(dev, |
401 | "Unexpected response is returned. returned user %p, expected user %p\n", | |
402 | msg->user, ipmi_device->user_interface); | |
6b68f03f | 403 | goto out_msg; |
e92b297c | 404 | } |
50065300 | 405 | |
06a8566b | 406 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
7b984477 | 407 | list_for_each_entry_safe(tx_msg, temp, &ipmi_device->tx_msg_list, head) { |
e92b297c | 408 | if (msg->msgid == tx_msg->tx_msgid) { |
7b984477 LZ |
409 | msg_found = true; |
410 | list_del(&tx_msg->head); | |
e92b297c ZY |
411 | break; |
412 | } | |
413 | } | |
7b984477 | 414 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
e92b297c | 415 | |
e92b297c | 416 | if (!msg_found) { |
50065300 LZ |
417 | dev_warn(dev, |
418 | "Unexpected response (msg id %ld) is returned.\n", | |
419 | msg->msgid); | |
7b984477 | 420 | goto out_msg; |
e92b297c ZY |
421 | } |
422 | ||
6b68f03f LZ |
423 | /* copy the response data to Rx_data buffer */ |
424 | if (msg->msg.data_len > ACPI_IPMI_MAX_MSG_LENGTH) { | |
2fb037b8 | 425 | dev_WARN_ONCE(dev, true, |
6b68f03f LZ |
426 | "Unexpected response (msg len %d).\n", |
427 | msg->msg.data_len); | |
8584ec6a | 428 | goto out_comp; |
e92b297c | 429 | } |
50065300 | 430 | |
8584ec6a LZ |
431 | /* response msg is an error msg */ |
432 | msg->recv_type = IPMI_RESPONSE_RECV_TYPE; | |
433 | if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE && | |
434 | msg->msg.data_len == 1) { | |
435 | if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) { | |
2fb037b8 | 436 | dev_WARN_ONCE(dev, true, |
8584ec6a LZ |
437 | "Unexpected response (timeout).\n"); |
438 | tx_msg->msg_done = ACPI_IPMI_TIMEOUT; | |
439 | } | |
440 | goto out_comp; | |
441 | } | |
50065300 | 442 | |
8584ec6a LZ |
443 | tx_msg->rx_len = msg->msg.data_len; |
444 | memcpy(tx_msg->data, msg->msg.data, tx_msg->rx_len); | |
445 | tx_msg->msg_done = ACPI_IPMI_OK; | |
50065300 | 446 | |
8584ec6a | 447 | out_comp: |
e92b297c | 448 | complete(&tx_msg->tx_complete); |
7b984477 | 449 | acpi_ipmi_msg_put(tx_msg); |
6b68f03f | 450 | out_msg: |
e92b297c | 451 | ipmi_free_recv_msg(msg); |
50065300 | 452 | } |
e92b297c ZY |
453 | |
454 | static void ipmi_register_bmc(int iface, struct device *dev) | |
455 | { | |
456 | struct acpi_ipmi_device *ipmi_device, *temp; | |
e92b297c ZY |
457 | int err; |
458 | struct ipmi_smi_info smi_data; | |
459 | acpi_handle handle; | |
460 | ||
461 | err = ipmi_get_smi_info(iface, &smi_data); | |
e92b297c ZY |
462 | if (err) |
463 | return; | |
464 | ||
a1a69b29 LZ |
465 | if (smi_data.addr_src != SI_ACPI) |
466 | goto err_ref; | |
e92b297c | 467 | handle = smi_data.addr_info.acpi_info.acpi_handle; |
a1a69b29 LZ |
468 | if (!handle) |
469 | goto err_ref; | |
a1a69b29 | 470 | |
2fb037b8 | 471 | ipmi_device = ipmi_dev_alloc(iface, smi_data.dev, handle); |
a1a69b29 | 472 | if (!ipmi_device) { |
2fb037b8 | 473 | dev_warn(smi_data.dev, "Can't create IPMI user interface\n"); |
a1a69b29 LZ |
474 | goto err_ref; |
475 | } | |
e92b297c ZY |
476 | |
477 | mutex_lock(&driver_data.ipmi_lock); | |
478 | list_for_each_entry(temp, &driver_data.ipmi_devices, head) { | |
479 | /* | |
480 | * if the corresponding ACPI handle is already added | |
481 | * to the device list, don't add it again. | |
482 | */ | |
483 | if (temp->handle == handle) | |
a1a69b29 | 484 | goto err_lock; |
e92b297c | 485 | } |
e96a94ed LZ |
486 | if (!driver_data.selected_smi) |
487 | driver_data.selected_smi = ipmi_device; | |
a1a69b29 | 488 | list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices); |
e92b297c | 489 | mutex_unlock(&driver_data.ipmi_lock); |
50065300 | 490 | |
a1a69b29 | 491 | put_device(smi_data.dev); |
e92b297c ZY |
492 | return; |
493 | ||
a1a69b29 | 494 | err_lock: |
e92b297c | 495 | mutex_unlock(&driver_data.ipmi_lock); |
a1a69b29 LZ |
496 | ipmi_dev_release(ipmi_device); |
497 | err_ref: | |
e92b297c ZY |
498 | put_device(smi_data.dev); |
499 | return; | |
500 | } | |
501 | ||
502 | static void ipmi_bmc_gone(int iface) | |
503 | { | |
504 | struct acpi_ipmi_device *ipmi_device, *temp; | |
a1a69b29 | 505 | bool dev_found = false; |
e92b297c ZY |
506 | |
507 | mutex_lock(&driver_data.ipmi_lock); | |
508 | list_for_each_entry_safe(ipmi_device, temp, | |
50065300 | 509 | &driver_data.ipmi_devices, head) { |
a1a69b29 LZ |
510 | if (ipmi_device->ipmi_ifnum != iface) { |
511 | dev_found = true; | |
512 | __ipmi_dev_kill(ipmi_device); | |
513 | break; | |
514 | } | |
e92b297c | 515 | } |
e96a94ed LZ |
516 | if (!driver_data.selected_smi) |
517 | driver_data.selected_smi = list_first_entry_or_null( | |
518 | &driver_data.ipmi_devices, | |
519 | struct acpi_ipmi_device, head); | |
e92b297c | 520 | mutex_unlock(&driver_data.ipmi_lock); |
50065300 | 521 | |
a1a69b29 LZ |
522 | if (dev_found) { |
523 | ipmi_flush_tx_msg(ipmi_device); | |
524 | acpi_ipmi_dev_put(ipmi_device); | |
525 | } | |
e92b297c | 526 | } |
50065300 | 527 | |
e92b297c ZY |
528 | /* |
529 | * This is the IPMI opregion space handler. | |
530 | * @function: indicates the read/write. In fact as the IPMI message is driven | |
531 | * by command, only write is meaningful. | |
532 | * @address: This contains the netfn/command of IPMI request message. | |
533 | * @bits : not used. | |
534 | * @value : it is an in/out parameter. It points to the IPMI message buffer. | |
535 | * Before the IPMI message is sent, it represents the actual request | |
536 | * IPMI message. After the IPMI message is finished, it represents | |
537 | * the response IPMI message returned by IPMI command. | |
538 | * @handler_context: IPMI device context. | |
539 | */ | |
e92b297c ZY |
540 | static acpi_status |
541 | acpi_ipmi_space_handler(u32 function, acpi_physical_address address, | |
50065300 LZ |
542 | u32 bits, acpi_integer *value, |
543 | void *handler_context, void *region_context) | |
e92b297c ZY |
544 | { |
545 | struct acpi_ipmi_msg *tx_msg; | |
a1a69b29 | 546 | struct acpi_ipmi_device *ipmi_device; |
8584ec6a | 547 | int err; |
e92b297c | 548 | acpi_status status; |
06a8566b | 549 | unsigned long flags; |
50065300 | 550 | |
e92b297c ZY |
551 | /* |
552 | * IPMI opregion message. | |
553 | * IPMI message is firstly written to the BMC and system software | |
554 | * can get the respsonse. So it is unmeaningful for the read access | |
555 | * of IPMI opregion. | |
556 | */ | |
557 | if ((function & ACPI_IO_MASK) == ACPI_READ) | |
558 | return AE_TYPE; | |
559 | ||
7b984477 LZ |
560 | tx_msg = ipmi_msg_alloc(); |
561 | if (!tx_msg) | |
e92b297c | 562 | return AE_NOT_EXIST; |
7b984477 | 563 | ipmi_device = tx_msg->device; |
e92b297c | 564 | |
6b68f03f | 565 | if (acpi_format_ipmi_request(tx_msg, address, value) != 0) { |
7b984477 LZ |
566 | ipmi_msg_release(tx_msg); |
567 | return AE_TYPE; | |
6b68f03f | 568 | } |
50065300 | 569 | |
7b984477 | 570 | acpi_ipmi_msg_get(tx_msg); |
a1a69b29 LZ |
571 | mutex_lock(&driver_data.ipmi_lock); |
572 | /* Do not add a tx_msg that can not be flushed. */ | |
573 | if (ipmi_device->dead) { | |
a1a69b29 | 574 | mutex_unlock(&driver_data.ipmi_lock); |
7b984477 LZ |
575 | ipmi_msg_release(tx_msg); |
576 | return AE_NOT_EXIST; | |
a1a69b29 | 577 | } |
06a8566b | 578 | spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags); |
e92b297c | 579 | list_add_tail(&tx_msg->head, &ipmi_device->tx_msg_list); |
06a8566b | 580 | spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags); |
a1a69b29 | 581 | mutex_unlock(&driver_data.ipmi_lock); |
50065300 | 582 | |
e92b297c | 583 | err = ipmi_request_settime(ipmi_device->user_interface, |
50065300 LZ |
584 | &tx_msg->addr, |
585 | tx_msg->tx_msgid, | |
586 | &tx_msg->tx_message, | |
587 | NULL, 0, 0, IPMI_TIMEOUT); | |
e92b297c ZY |
588 | if (err) { |
589 | status = AE_ERROR; | |
7b984477 | 590 | goto out_msg; |
e92b297c | 591 | } |
8584ec6a | 592 | wait_for_completion(&tx_msg->tx_complete); |
50065300 | 593 | |
8584ec6a | 594 | acpi_format_ipmi_response(tx_msg, value); |
e92b297c ZY |
595 | status = AE_OK; |
596 | ||
6b68f03f | 597 | out_msg: |
7b984477 LZ |
598 | ipmi_cancel_tx_msg(ipmi_device, tx_msg); |
599 | acpi_ipmi_msg_put(tx_msg); | |
e92b297c ZY |
600 | return status; |
601 | } | |
602 | ||
e92b297c ZY |
603 | static int __init acpi_ipmi_init(void) |
604 | { | |
a194aa43 | 605 | int result; |
e96a94ed | 606 | acpi_status status; |
e92b297c ZY |
607 | |
608 | if (acpi_disabled) | |
a194aa43 | 609 | return 0; |
e92b297c | 610 | |
e96a94ed | 611 | status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT, |
50065300 LZ |
612 | ACPI_ADR_SPACE_IPMI, |
613 | &acpi_ipmi_space_handler, | |
614 | NULL, NULL); | |
e96a94ed LZ |
615 | if (ACPI_FAILURE(status)) { |
616 | pr_warn("Can't register IPMI opregion space handle\n"); | |
617 | return -EINVAL; | |
618 | } | |
e92b297c | 619 | result = ipmi_smi_watcher_register(&driver_data.bmc_events); |
e96a94ed LZ |
620 | if (result) |
621 | pr_err("Can't register IPMI system interface watcher\n"); | |
e92b297c ZY |
622 | |
623 | return result; | |
624 | } | |
625 | ||
626 | static void __exit acpi_ipmi_exit(void) | |
627 | { | |
a1a69b29 | 628 | struct acpi_ipmi_device *ipmi_device; |
e92b297c ZY |
629 | |
630 | if (acpi_disabled) | |
631 | return; | |
632 | ||
633 | ipmi_smi_watcher_unregister(&driver_data.bmc_events); | |
634 | ||
635 | /* | |
636 | * When one smi_watcher is unregistered, it is only deleted | |
637 | * from the smi_watcher list. But the smi_gone callback function | |
638 | * is not called. So explicitly uninstall the ACPI IPMI oregion | |
639 | * handler and free it. | |
640 | */ | |
641 | mutex_lock(&driver_data.ipmi_lock); | |
a1a69b29 LZ |
642 | while (!list_empty(&driver_data.ipmi_devices)) { |
643 | ipmi_device = list_first_entry(&driver_data.ipmi_devices, | |
644 | struct acpi_ipmi_device, | |
645 | head); | |
646 | __ipmi_dev_kill(ipmi_device); | |
647 | mutex_unlock(&driver_data.ipmi_lock); | |
648 | ||
649 | ipmi_flush_tx_msg(ipmi_device); | |
650 | acpi_ipmi_dev_put(ipmi_device); | |
651 | ||
652 | mutex_lock(&driver_data.ipmi_lock); | |
e92b297c ZY |
653 | } |
654 | mutex_unlock(&driver_data.ipmi_lock); | |
e96a94ed | 655 | acpi_remove_address_space_handler(ACPI_ROOT_OBJECT, |
50065300 LZ |
656 | ACPI_ADR_SPACE_IPMI, |
657 | &acpi_ipmi_space_handler); | |
e92b297c ZY |
658 | } |
659 | ||
660 | module_init(acpi_ipmi_init); | |
661 | module_exit(acpi_ipmi_exit); |