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