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