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