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1 | /* | |
2 | * A hwmon driver for the IBM System Director Active Energy Manager (AEM) | |
3 | * temperature/power/energy sensors and capping functionality. | |
4 | * Copyright (C) 2008 IBM | |
5 | * | |
6 | * Author: Darrick J. Wong <darrick.wong@oracle.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
24 | ||
25 | #include <linux/ipmi.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/hwmon.h> | |
28 | #include <linux/hwmon-sysfs.h> | |
29 | #include <linux/jiffies.h> | |
30 | #include <linux/mutex.h> | |
31 | #include <linux/kdev_t.h> | |
32 | #include <linux/spinlock.h> | |
33 | #include <linux/idr.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/platform_device.h> | |
37 | #include <linux/math64.h> | |
38 | #include <linux/time.h> | |
39 | #include <linux/err.h> | |
40 | ||
41 | #define REFRESH_INTERVAL (HZ) | |
42 | #define IPMI_TIMEOUT (30 * HZ) | |
43 | #define DRVNAME "aem" | |
44 | ||
45 | #define AEM_NETFN 0x2E | |
46 | ||
47 | #define AEM_FIND_FW_CMD 0x80 | |
48 | #define AEM_ELEMENT_CMD 0x81 | |
49 | #define AEM_FW_INSTANCE_CMD 0x82 | |
50 | ||
51 | #define AEM_READ_ELEMENT_CFG 0x80 | |
52 | #define AEM_READ_BUFFER 0x81 | |
53 | #define AEM_READ_REGISTER 0x82 | |
54 | #define AEM_WRITE_REGISTER 0x83 | |
55 | #define AEM_SET_REG_MASK 0x84 | |
56 | #define AEM_CLEAR_REG_MASK 0x85 | |
57 | #define AEM_READ_ELEMENT_CFG2 0x86 | |
58 | ||
59 | #define AEM_CONTROL_ELEMENT 0 | |
60 | #define AEM_ENERGY_ELEMENT 1 | |
61 | #define AEM_CLOCK_ELEMENT 4 | |
62 | #define AEM_POWER_CAP_ELEMENT 7 | |
63 | #define AEM_EXHAUST_ELEMENT 9 | |
64 | #define AEM_POWER_ELEMENT 10 | |
65 | ||
66 | #define AEM_MODULE_TYPE_ID 0x0001 | |
67 | ||
68 | #define AEM2_NUM_ENERGY_REGS 2 | |
69 | #define AEM2_NUM_PCAP_REGS 6 | |
70 | #define AEM2_NUM_TEMP_REGS 2 | |
71 | #define AEM2_NUM_SENSORS 14 | |
72 | ||
73 | #define AEM1_NUM_ENERGY_REGS 1 | |
74 | #define AEM1_NUM_SENSORS 3 | |
75 | ||
76 | /* AEM 2.x has more energy registers */ | |
77 | #define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS | |
78 | /* AEM 2.x needs more sensor files */ | |
79 | #define AEM_NUM_SENSORS AEM2_NUM_SENSORS | |
80 | ||
81 | #define POWER_CAP 0 | |
82 | #define POWER_CAP_MAX_HOTPLUG 1 | |
83 | #define POWER_CAP_MAX 2 | |
84 | #define POWER_CAP_MIN_WARNING 3 | |
85 | #define POWER_CAP_MIN 4 | |
86 | #define POWER_AUX 5 | |
87 | ||
88 | #define AEM_DEFAULT_POWER_INTERVAL 1000 | |
89 | #define AEM_MIN_POWER_INTERVAL 200 | |
90 | #define UJ_PER_MJ 1000L | |
91 | ||
92 | static DEFINE_IDA(aem_ida); | |
93 | ||
94 | static struct platform_driver aem_driver = { | |
95 | .driver = { | |
96 | .name = DRVNAME, | |
97 | .bus = &platform_bus_type, | |
98 | } | |
99 | }; | |
100 | ||
101 | struct aem_ipmi_data { | |
102 | struct completion read_complete; | |
103 | struct ipmi_addr address; | |
104 | ipmi_user_t user; | |
105 | int interface; | |
106 | ||
107 | struct kernel_ipmi_msg tx_message; | |
108 | long tx_msgid; | |
109 | ||
110 | void *rx_msg_data; | |
111 | unsigned short rx_msg_len; | |
112 | unsigned char rx_result; | |
113 | int rx_recv_type; | |
114 | ||
115 | struct device *bmc_device; | |
116 | }; | |
117 | ||
118 | struct aem_ro_sensor_template { | |
119 | char *label; | |
120 | ssize_t (*show)(struct device *dev, | |
121 | struct device_attribute *devattr, | |
122 | char *buf); | |
123 | int index; | |
124 | }; | |
125 | ||
126 | struct aem_rw_sensor_template { | |
127 | char *label; | |
128 | ssize_t (*show)(struct device *dev, | |
129 | struct device_attribute *devattr, | |
130 | char *buf); | |
131 | ssize_t (*set)(struct device *dev, | |
132 | struct device_attribute *devattr, | |
133 | const char *buf, size_t count); | |
134 | int index; | |
135 | }; | |
136 | ||
137 | struct aem_data { | |
138 | struct list_head list; | |
139 | ||
140 | struct device *hwmon_dev; | |
141 | struct platform_device *pdev; | |
142 | struct mutex lock; | |
143 | char valid; | |
144 | unsigned long last_updated; /* In jiffies */ | |
145 | u8 ver_major; | |
146 | u8 ver_minor; | |
147 | u8 module_handle; | |
148 | int id; | |
149 | struct aem_ipmi_data ipmi; | |
150 | ||
151 | /* Function and buffer to update sensors */ | |
152 | void (*update)(struct aem_data *data); | |
153 | struct aem_read_sensor_resp *rs_resp; | |
154 | ||
155 | /* | |
156 | * AEM 1.x sensors: | |
157 | * Available sensors: | |
158 | * Energy meter | |
159 | * Power meter | |
160 | * | |
161 | * AEM 2.x sensors: | |
162 | * Two energy meters | |
163 | * Two power meters | |
164 | * Two temperature sensors | |
165 | * Six power cap registers | |
166 | */ | |
167 | ||
168 | /* sysfs attrs */ | |
169 | struct sensor_device_attribute sensors[AEM_NUM_SENSORS]; | |
170 | ||
171 | /* energy use in mJ */ | |
172 | u64 energy[AEM_NUM_ENERGY_REGS]; | |
173 | ||
174 | /* power sampling interval in ms */ | |
175 | unsigned long power_period[AEM_NUM_ENERGY_REGS]; | |
176 | ||
177 | /* Everything past here is for AEM2 only */ | |
178 | ||
179 | /* power caps in dW */ | |
180 | u16 pcap[AEM2_NUM_PCAP_REGS]; | |
181 | ||
182 | /* exhaust temperature in C */ | |
183 | u8 temp[AEM2_NUM_TEMP_REGS]; | |
184 | }; | |
185 | ||
186 | /* Data structures returned by the AEM firmware */ | |
187 | struct aem_iana_id { | |
188 | u8 bytes[3]; | |
189 | }; | |
190 | static struct aem_iana_id system_x_id = { | |
191 | .bytes = {0x4D, 0x4F, 0x00} | |
192 | }; | |
193 | ||
194 | /* These are used to find AEM1 instances */ | |
195 | struct aem_find_firmware_req { | |
196 | struct aem_iana_id id; | |
197 | u8 rsvd; | |
198 | __be16 index; | |
199 | __be16 module_type_id; | |
200 | } __packed; | |
201 | ||
202 | struct aem_find_firmware_resp { | |
203 | struct aem_iana_id id; | |
204 | u8 num_instances; | |
205 | } __packed; | |
206 | ||
207 | /* These are used to find AEM2 instances */ | |
208 | struct aem_find_instance_req { | |
209 | struct aem_iana_id id; | |
210 | u8 instance_number; | |
211 | __be16 module_type_id; | |
212 | } __packed; | |
213 | ||
214 | struct aem_find_instance_resp { | |
215 | struct aem_iana_id id; | |
216 | u8 num_instances; | |
217 | u8 major; | |
218 | u8 minor; | |
219 | u8 module_handle; | |
220 | u16 record_id; | |
221 | } __packed; | |
222 | ||
223 | /* These are used to query sensors */ | |
224 | struct aem_read_sensor_req { | |
225 | struct aem_iana_id id; | |
226 | u8 module_handle; | |
227 | u8 element; | |
228 | u8 subcommand; | |
229 | u8 reg; | |
230 | u8 rx_buf_size; | |
231 | } __packed; | |
232 | ||
233 | struct aem_read_sensor_resp { | |
234 | struct aem_iana_id id; | |
235 | u8 bytes[0]; | |
236 | } __packed; | |
237 | ||
238 | /* Data structures to talk to the IPMI layer */ | |
239 | struct aem_driver_data { | |
240 | struct list_head aem_devices; | |
241 | struct ipmi_smi_watcher bmc_events; | |
242 | struct ipmi_user_hndl ipmi_hndlrs; | |
243 | }; | |
244 | ||
245 | static void aem_register_bmc(int iface, struct device *dev); | |
246 | static void aem_bmc_gone(int iface); | |
247 | static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); | |
248 | ||
249 | static void aem_remove_sensors(struct aem_data *data); | |
250 | static int aem1_find_sensors(struct aem_data *data); | |
251 | static int aem2_find_sensors(struct aem_data *data); | |
252 | static void update_aem1_sensors(struct aem_data *data); | |
253 | static void update_aem2_sensors(struct aem_data *data); | |
254 | ||
255 | static struct aem_driver_data driver_data = { | |
256 | .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices), | |
257 | .bmc_events = { | |
258 | .owner = THIS_MODULE, | |
259 | .new_smi = aem_register_bmc, | |
260 | .smi_gone = aem_bmc_gone, | |
261 | }, | |
262 | .ipmi_hndlrs = { | |
263 | .ipmi_recv_hndl = aem_msg_handler, | |
264 | }, | |
265 | }; | |
266 | ||
267 | /* Functions to talk to the IPMI layer */ | |
268 | ||
269 | /* Initialize IPMI address, message buffers and user data */ | |
270 | static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface, | |
271 | struct device *bmc) | |
272 | { | |
273 | int err; | |
274 | ||
275 | init_completion(&data->read_complete); | |
276 | data->bmc_device = bmc; | |
277 | ||
278 | /* Initialize IPMI address */ | |
279 | data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
280 | data->address.channel = IPMI_BMC_CHANNEL; | |
281 | data->address.data[0] = 0; | |
282 | data->interface = iface; | |
283 | ||
284 | /* Initialize message buffers */ | |
285 | data->tx_msgid = 0; | |
286 | data->tx_message.netfn = AEM_NETFN; | |
287 | ||
288 | /* Create IPMI messaging interface user */ | |
289 | err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs, | |
290 | data, &data->user); | |
291 | if (err < 0) { | |
292 | dev_err(bmc, | |
293 | "Unable to register user with IPMI interface %d\n", | |
294 | data->interface); | |
295 | return err; | |
296 | } | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | /* Send an IPMI command */ | |
302 | static int aem_send_message(struct aem_ipmi_data *data) | |
303 | { | |
304 | int err; | |
305 | ||
306 | err = ipmi_validate_addr(&data->address, sizeof(data->address)); | |
307 | if (err) | |
308 | goto out; | |
309 | ||
310 | data->tx_msgid++; | |
311 | err = ipmi_request_settime(data->user, &data->address, data->tx_msgid, | |
312 | &data->tx_message, data, 0, 0, 0); | |
313 | if (err) | |
314 | goto out1; | |
315 | ||
316 | return 0; | |
317 | out1: | |
318 | dev_err(data->bmc_device, "request_settime=%x\n", err); | |
319 | return err; | |
320 | out: | |
321 | dev_err(data->bmc_device, "validate_addr=%x\n", err); | |
322 | return err; | |
323 | } | |
324 | ||
325 | /* Dispatch IPMI messages to callers */ | |
326 | static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) | |
327 | { | |
328 | unsigned short rx_len; | |
329 | struct aem_ipmi_data *data = user_msg_data; | |
330 | ||
331 | if (msg->msgid != data->tx_msgid) { | |
332 | dev_err(data->bmc_device, | |
333 | "Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n", | |
334 | (int)msg->msgid, | |
335 | (int)data->tx_msgid); | |
336 | ipmi_free_recv_msg(msg); | |
337 | return; | |
338 | } | |
339 | ||
340 | data->rx_recv_type = msg->recv_type; | |
341 | if (msg->msg.data_len > 0) | |
342 | data->rx_result = msg->msg.data[0]; | |
343 | else | |
344 | data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE; | |
345 | ||
346 | if (msg->msg.data_len > 1) { | |
347 | rx_len = msg->msg.data_len - 1; | |
348 | if (data->rx_msg_len < rx_len) | |
349 | rx_len = data->rx_msg_len; | |
350 | data->rx_msg_len = rx_len; | |
351 | memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len); | |
352 | } else | |
353 | data->rx_msg_len = 0; | |
354 | ||
355 | ipmi_free_recv_msg(msg); | |
356 | complete(&data->read_complete); | |
357 | } | |
358 | ||
359 | /* Sensor support functions */ | |
360 | ||
361 | /* Read a sensor value; must be called with data->lock held */ | |
362 | static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg, | |
363 | void *buf, size_t size) | |
364 | { | |
365 | int rs_size, res; | |
366 | struct aem_read_sensor_req rs_req; | |
367 | /* Use preallocated rx buffer */ | |
368 | struct aem_read_sensor_resp *rs_resp = data->rs_resp; | |
369 | struct aem_ipmi_data *ipmi = &data->ipmi; | |
370 | ||
371 | /* AEM registers are 1, 2, 4 or 8 bytes */ | |
372 | switch (size) { | |
373 | case 1: | |
374 | case 2: | |
375 | case 4: | |
376 | case 8: | |
377 | break; | |
378 | default: | |
379 | return -EINVAL; | |
380 | } | |
381 | ||
382 | rs_req.id = system_x_id; | |
383 | rs_req.module_handle = data->module_handle; | |
384 | rs_req.element = elt; | |
385 | rs_req.subcommand = AEM_READ_REGISTER; | |
386 | rs_req.reg = reg; | |
387 | rs_req.rx_buf_size = size; | |
388 | ||
389 | ipmi->tx_message.cmd = AEM_ELEMENT_CMD; | |
390 | ipmi->tx_message.data = (char *)&rs_req; | |
391 | ipmi->tx_message.data_len = sizeof(rs_req); | |
392 | ||
393 | rs_size = sizeof(*rs_resp) + size; | |
394 | ipmi->rx_msg_data = rs_resp; | |
395 | ipmi->rx_msg_len = rs_size; | |
396 | ||
397 | aem_send_message(ipmi); | |
398 | ||
399 | res = wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT); | |
400 | if (!res) { | |
401 | res = -ETIMEDOUT; | |
402 | goto out; | |
403 | } | |
404 | ||
405 | if (ipmi->rx_result || ipmi->rx_msg_len != rs_size || | |
406 | memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) { | |
407 | res = -ENOENT; | |
408 | goto out; | |
409 | } | |
410 | ||
411 | switch (size) { | |
412 | case 1: { | |
413 | u8 *x = buf; | |
414 | *x = rs_resp->bytes[0]; | |
415 | break; | |
416 | } | |
417 | case 2: { | |
418 | u16 *x = buf; | |
419 | *x = be16_to_cpup((__be16 *)rs_resp->bytes); | |
420 | break; | |
421 | } | |
422 | case 4: { | |
423 | u32 *x = buf; | |
424 | *x = be32_to_cpup((__be32 *)rs_resp->bytes); | |
425 | break; | |
426 | } | |
427 | case 8: { | |
428 | u64 *x = buf; | |
429 | *x = be64_to_cpup((__be64 *)rs_resp->bytes); | |
430 | break; | |
431 | } | |
432 | } | |
433 | res = 0; | |
434 | ||
435 | out: | |
436 | return res; | |
437 | } | |
438 | ||
439 | /* Update AEM energy registers */ | |
440 | static void update_aem_energy_one(struct aem_data *data, int which) | |
441 | { | |
442 | aem_read_sensor(data, AEM_ENERGY_ELEMENT, which, | |
443 | &data->energy[which], 8); | |
444 | } | |
445 | ||
446 | static void update_aem_energy(struct aem_data *data) | |
447 | { | |
448 | update_aem_energy_one(data, 0); | |
449 | if (data->ver_major < 2) | |
450 | return; | |
451 | update_aem_energy_one(data, 1); | |
452 | } | |
453 | ||
454 | /* Update all AEM1 sensors */ | |
455 | static void update_aem1_sensors(struct aem_data *data) | |
456 | { | |
457 | mutex_lock(&data->lock); | |
458 | if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && | |
459 | data->valid) | |
460 | goto out; | |
461 | ||
462 | update_aem_energy(data); | |
463 | out: | |
464 | mutex_unlock(&data->lock); | |
465 | } | |
466 | ||
467 | /* Update all AEM2 sensors */ | |
468 | static void update_aem2_sensors(struct aem_data *data) | |
469 | { | |
470 | int i; | |
471 | ||
472 | mutex_lock(&data->lock); | |
473 | if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && | |
474 | data->valid) | |
475 | goto out; | |
476 | ||
477 | update_aem_energy(data); | |
478 | aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1); | |
479 | aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1); | |
480 | ||
481 | for (i = POWER_CAP; i <= POWER_AUX; i++) | |
482 | aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i, | |
483 | &data->pcap[i], 2); | |
484 | out: | |
485 | mutex_unlock(&data->lock); | |
486 | } | |
487 | ||
488 | /* Delete an AEM instance */ | |
489 | static void aem_delete(struct aem_data *data) | |
490 | { | |
491 | list_del(&data->list); | |
492 | aem_remove_sensors(data); | |
493 | kfree(data->rs_resp); | |
494 | hwmon_device_unregister(data->hwmon_dev); | |
495 | ipmi_destroy_user(data->ipmi.user); | |
496 | platform_set_drvdata(data->pdev, NULL); | |
497 | platform_device_unregister(data->pdev); | |
498 | ida_simple_remove(&aem_ida, data->id); | |
499 | kfree(data); | |
500 | } | |
501 | ||
502 | /* Probe functions for AEM1 devices */ | |
503 | ||
504 | /* Retrieve version and module handle for an AEM1 instance */ | |
505 | static int aem_find_aem1_count(struct aem_ipmi_data *data) | |
506 | { | |
507 | int res; | |
508 | struct aem_find_firmware_req ff_req; | |
509 | struct aem_find_firmware_resp ff_resp; | |
510 | ||
511 | ff_req.id = system_x_id; | |
512 | ff_req.index = 0; | |
513 | ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); | |
514 | ||
515 | data->tx_message.cmd = AEM_FIND_FW_CMD; | |
516 | data->tx_message.data = (char *)&ff_req; | |
517 | data->tx_message.data_len = sizeof(ff_req); | |
518 | ||
519 | data->rx_msg_data = &ff_resp; | |
520 | data->rx_msg_len = sizeof(ff_resp); | |
521 | ||
522 | aem_send_message(data); | |
523 | ||
524 | res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); | |
525 | if (!res) | |
526 | return -ETIMEDOUT; | |
527 | ||
528 | if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) || | |
529 | memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id))) | |
530 | return -ENOENT; | |
531 | ||
532 | return ff_resp.num_instances; | |
533 | } | |
534 | ||
535 | /* Find and initialize one AEM1 instance */ | |
536 | static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle) | |
537 | { | |
538 | struct aem_data *data; | |
539 | int i; | |
540 | int res = -ENOMEM; | |
541 | ||
542 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
543 | if (!data) | |
544 | return res; | |
545 | mutex_init(&data->lock); | |
546 | ||
547 | /* Copy instance data */ | |
548 | data->ver_major = 1; | |
549 | data->ver_minor = 0; | |
550 | data->module_handle = module_handle; | |
551 | for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++) | |
552 | data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; | |
553 | ||
554 | /* Create sub-device for this fw instance */ | |
555 | data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL); | |
556 | if (data->id < 0) | |
557 | goto id_err; | |
558 | ||
559 | data->pdev = platform_device_alloc(DRVNAME, data->id); | |
560 | if (!data->pdev) | |
561 | goto dev_err; | |
562 | data->pdev->dev.driver = &aem_driver.driver; | |
563 | ||
564 | res = platform_device_add(data->pdev); | |
565 | if (res) | |
566 | goto ipmi_err; | |
567 | ||
568 | platform_set_drvdata(data->pdev, data); | |
569 | ||
570 | /* Set up IPMI interface */ | |
571 | res = aem_init_ipmi_data(&data->ipmi, probe->interface, | |
572 | probe->bmc_device); | |
573 | if (res) | |
574 | goto ipmi_err; | |
575 | ||
576 | /* Register with hwmon */ | |
577 | data->hwmon_dev = hwmon_device_register(&data->pdev->dev); | |
578 | if (IS_ERR(data->hwmon_dev)) { | |
579 | dev_err(&data->pdev->dev, | |
580 | "Unable to register hwmon device for IPMI interface %d\n", | |
581 | probe->interface); | |
582 | res = PTR_ERR(data->hwmon_dev); | |
583 | goto hwmon_reg_err; | |
584 | } | |
585 | ||
586 | data->update = update_aem1_sensors; | |
587 | data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL); | |
588 | if (!data->rs_resp) { | |
589 | res = -ENOMEM; | |
590 | goto alloc_resp_err; | |
591 | } | |
592 | ||
593 | /* Find sensors */ | |
594 | res = aem1_find_sensors(data); | |
595 | if (res) | |
596 | goto sensor_err; | |
597 | ||
598 | /* Add to our list of AEM devices */ | |
599 | list_add_tail(&data->list, &driver_data.aem_devices); | |
600 | ||
601 | dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", | |
602 | data->ver_major, data->ver_minor, | |
603 | data->module_handle); | |
604 | return 0; | |
605 | ||
606 | sensor_err: | |
607 | kfree(data->rs_resp); | |
608 | alloc_resp_err: | |
609 | hwmon_device_unregister(data->hwmon_dev); | |
610 | hwmon_reg_err: | |
611 | ipmi_destroy_user(data->ipmi.user); | |
612 | ipmi_err: | |
613 | platform_set_drvdata(data->pdev, NULL); | |
614 | platform_device_unregister(data->pdev); | |
615 | dev_err: | |
616 | ida_simple_remove(&aem_ida, data->id); | |
617 | id_err: | |
618 | kfree(data); | |
619 | ||
620 | return res; | |
621 | } | |
622 | ||
623 | /* Find and initialize all AEM1 instances */ | |
624 | static void aem_init_aem1(struct aem_ipmi_data *probe) | |
625 | { | |
626 | int num, i, err; | |
627 | ||
628 | num = aem_find_aem1_count(probe); | |
629 | for (i = 0; i < num; i++) { | |
630 | err = aem_init_aem1_inst(probe, i); | |
631 | if (err) { | |
632 | dev_err(probe->bmc_device, | |
633 | "Error %d initializing AEM1 0x%X\n", | |
634 | err, i); | |
635 | } | |
636 | } | |
637 | } | |
638 | ||
639 | /* Probe functions for AEM2 devices */ | |
640 | ||
641 | /* Retrieve version and module handle for an AEM2 instance */ | |
642 | static int aem_find_aem2(struct aem_ipmi_data *data, | |
643 | struct aem_find_instance_resp *fi_resp, | |
644 | int instance_num) | |
645 | { | |
646 | int res; | |
647 | struct aem_find_instance_req fi_req; | |
648 | ||
649 | fi_req.id = system_x_id; | |
650 | fi_req.instance_number = instance_num; | |
651 | fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); | |
652 | ||
653 | data->tx_message.cmd = AEM_FW_INSTANCE_CMD; | |
654 | data->tx_message.data = (char *)&fi_req; | |
655 | data->tx_message.data_len = sizeof(fi_req); | |
656 | ||
657 | data->rx_msg_data = fi_resp; | |
658 | data->rx_msg_len = sizeof(*fi_resp); | |
659 | ||
660 | aem_send_message(data); | |
661 | ||
662 | res = wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT); | |
663 | if (!res) | |
664 | return -ETIMEDOUT; | |
665 | ||
666 | if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) || | |
667 | memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) || | |
668 | fi_resp->num_instances <= instance_num) | |
669 | return -ENOENT; | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | /* Find and initialize one AEM2 instance */ | |
675 | static int aem_init_aem2_inst(struct aem_ipmi_data *probe, | |
676 | struct aem_find_instance_resp *fi_resp) | |
677 | { | |
678 | struct aem_data *data; | |
679 | int i; | |
680 | int res = -ENOMEM; | |
681 | ||
682 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
683 | if (!data) | |
684 | return res; | |
685 | mutex_init(&data->lock); | |
686 | ||
687 | /* Copy instance data */ | |
688 | data->ver_major = fi_resp->major; | |
689 | data->ver_minor = fi_resp->minor; | |
690 | data->module_handle = fi_resp->module_handle; | |
691 | for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++) | |
692 | data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; | |
693 | ||
694 | /* Create sub-device for this fw instance */ | |
695 | data->id = ida_simple_get(&aem_ida, 0, 0, GFP_KERNEL); | |
696 | if (data->id < 0) | |
697 | goto id_err; | |
698 | ||
699 | data->pdev = platform_device_alloc(DRVNAME, data->id); | |
700 | if (!data->pdev) | |
701 | goto dev_err; | |
702 | data->pdev->dev.driver = &aem_driver.driver; | |
703 | ||
704 | res = platform_device_add(data->pdev); | |
705 | if (res) | |
706 | goto ipmi_err; | |
707 | ||
708 | platform_set_drvdata(data->pdev, data); | |
709 | ||
710 | /* Set up IPMI interface */ | |
711 | res = aem_init_ipmi_data(&data->ipmi, probe->interface, | |
712 | probe->bmc_device); | |
713 | if (res) | |
714 | goto ipmi_err; | |
715 | ||
716 | /* Register with hwmon */ | |
717 | data->hwmon_dev = hwmon_device_register(&data->pdev->dev); | |
718 | if (IS_ERR(data->hwmon_dev)) { | |
719 | dev_err(&data->pdev->dev, | |
720 | "Unable to register hwmon device for IPMI interface %d\n", | |
721 | probe->interface); | |
722 | res = PTR_ERR(data->hwmon_dev); | |
723 | goto hwmon_reg_err; | |
724 | } | |
725 | ||
726 | data->update = update_aem2_sensors; | |
727 | data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL); | |
728 | if (!data->rs_resp) { | |
729 | res = -ENOMEM; | |
730 | goto alloc_resp_err; | |
731 | } | |
732 | ||
733 | /* Find sensors */ | |
734 | res = aem2_find_sensors(data); | |
735 | if (res) | |
736 | goto sensor_err; | |
737 | ||
738 | /* Add to our list of AEM devices */ | |
739 | list_add_tail(&data->list, &driver_data.aem_devices); | |
740 | ||
741 | dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", | |
742 | data->ver_major, data->ver_minor, | |
743 | data->module_handle); | |
744 | return 0; | |
745 | ||
746 | sensor_err: | |
747 | kfree(data->rs_resp); | |
748 | alloc_resp_err: | |
749 | hwmon_device_unregister(data->hwmon_dev); | |
750 | hwmon_reg_err: | |
751 | ipmi_destroy_user(data->ipmi.user); | |
752 | ipmi_err: | |
753 | platform_set_drvdata(data->pdev, NULL); | |
754 | platform_device_unregister(data->pdev); | |
755 | dev_err: | |
756 | ida_simple_remove(&aem_ida, data->id); | |
757 | id_err: | |
758 | kfree(data); | |
759 | ||
760 | return res; | |
761 | } | |
762 | ||
763 | /* Find and initialize all AEM2 instances */ | |
764 | static void aem_init_aem2(struct aem_ipmi_data *probe) | |
765 | { | |
766 | struct aem_find_instance_resp fi_resp; | |
767 | int err; | |
768 | int i = 0; | |
769 | ||
770 | while (!aem_find_aem2(probe, &fi_resp, i)) { | |
771 | if (fi_resp.major != 2) { | |
772 | dev_err(probe->bmc_device, | |
773 | "Unknown AEM v%d; please report this to the maintainer.\n", | |
774 | fi_resp.major); | |
775 | i++; | |
776 | continue; | |
777 | } | |
778 | err = aem_init_aem2_inst(probe, &fi_resp); | |
779 | if (err) { | |
780 | dev_err(probe->bmc_device, | |
781 | "Error %d initializing AEM2 0x%X\n", | |
782 | err, fi_resp.module_handle); | |
783 | } | |
784 | i++; | |
785 | } | |
786 | } | |
787 | ||
788 | /* Probe a BMC for AEM firmware instances */ | |
789 | static void aem_register_bmc(int iface, struct device *dev) | |
790 | { | |
791 | struct aem_ipmi_data probe; | |
792 | ||
793 | if (aem_init_ipmi_data(&probe, iface, dev)) | |
794 | return; | |
795 | ||
796 | /* Ignore probe errors; they won't cause problems */ | |
797 | aem_init_aem1(&probe); | |
798 | aem_init_aem2(&probe); | |
799 | ||
800 | ipmi_destroy_user(probe.user); | |
801 | } | |
802 | ||
803 | /* Handle BMC deletion */ | |
804 | static void aem_bmc_gone(int iface) | |
805 | { | |
806 | struct aem_data *p1, *next1; | |
807 | ||
808 | list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) | |
809 | if (p1->ipmi.interface == iface) | |
810 | aem_delete(p1); | |
811 | } | |
812 | ||
813 | /* sysfs support functions */ | |
814 | ||
815 | /* AEM device name */ | |
816 | static ssize_t show_name(struct device *dev, struct device_attribute *devattr, | |
817 | char *buf) | |
818 | { | |
819 | struct aem_data *data = dev_get_drvdata(dev); | |
820 | ||
821 | return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major); | |
822 | } | |
823 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0); | |
824 | ||
825 | /* AEM device version */ | |
826 | static ssize_t show_version(struct device *dev, | |
827 | struct device_attribute *devattr, | |
828 | char *buf) | |
829 | { | |
830 | struct aem_data *data = dev_get_drvdata(dev); | |
831 | ||
832 | return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor); | |
833 | } | |
834 | static SENSOR_DEVICE_ATTR(version, S_IRUGO, show_version, NULL, 0); | |
835 | ||
836 | /* Display power use */ | |
837 | static ssize_t aem_show_power(struct device *dev, | |
838 | struct device_attribute *devattr, | |
839 | char *buf) | |
840 | { | |
841 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
842 | struct aem_data *data = dev_get_drvdata(dev); | |
843 | u64 before, after, delta, time; | |
844 | signed long leftover; | |
845 | ||
846 | mutex_lock(&data->lock); | |
847 | update_aem_energy_one(data, attr->index); | |
848 | time = ktime_get_ns(); | |
849 | before = data->energy[attr->index]; | |
850 | ||
851 | leftover = schedule_timeout_interruptible( | |
852 | msecs_to_jiffies(data->power_period[attr->index]) | |
853 | ); | |
854 | if (leftover) { | |
855 | mutex_unlock(&data->lock); | |
856 | return 0; | |
857 | } | |
858 | ||
859 | update_aem_energy_one(data, attr->index); | |
860 | time = ktime_get_ns() - time; | |
861 | after = data->energy[attr->index]; | |
862 | mutex_unlock(&data->lock); | |
863 | ||
864 | delta = (after - before) * UJ_PER_MJ; | |
865 | ||
866 | return sprintf(buf, "%llu\n", | |
867 | (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time)); | |
868 | } | |
869 | ||
870 | /* Display energy use */ | |
871 | static ssize_t aem_show_energy(struct device *dev, | |
872 | struct device_attribute *devattr, | |
873 | char *buf) | |
874 | { | |
875 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
876 | struct aem_data *a = dev_get_drvdata(dev); | |
877 | mutex_lock(&a->lock); | |
878 | update_aem_energy_one(a, attr->index); | |
879 | mutex_unlock(&a->lock); | |
880 | ||
881 | return sprintf(buf, "%llu\n", | |
882 | (unsigned long long)a->energy[attr->index] * 1000); | |
883 | } | |
884 | ||
885 | /* Display power interval registers */ | |
886 | static ssize_t aem_show_power_period(struct device *dev, | |
887 | struct device_attribute *devattr, | |
888 | char *buf) | |
889 | { | |
890 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
891 | struct aem_data *a = dev_get_drvdata(dev); | |
892 | a->update(a); | |
893 | ||
894 | return sprintf(buf, "%lu\n", a->power_period[attr->index]); | |
895 | } | |
896 | ||
897 | /* Set power interval registers */ | |
898 | static ssize_t aem_set_power_period(struct device *dev, | |
899 | struct device_attribute *devattr, | |
900 | const char *buf, size_t count) | |
901 | { | |
902 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
903 | struct aem_data *a = dev_get_drvdata(dev); | |
904 | unsigned long temp; | |
905 | int res; | |
906 | ||
907 | res = kstrtoul(buf, 10, &temp); | |
908 | if (res) | |
909 | return res; | |
910 | ||
911 | if (temp < AEM_MIN_POWER_INTERVAL) | |
912 | return -EINVAL; | |
913 | ||
914 | mutex_lock(&a->lock); | |
915 | a->power_period[attr->index] = temp; | |
916 | mutex_unlock(&a->lock); | |
917 | ||
918 | return count; | |
919 | } | |
920 | ||
921 | /* Discover sensors on an AEM device */ | |
922 | static int aem_register_sensors(struct aem_data *data, | |
923 | struct aem_ro_sensor_template *ro, | |
924 | struct aem_rw_sensor_template *rw) | |
925 | { | |
926 | struct device *dev = &data->pdev->dev; | |
927 | struct sensor_device_attribute *sensors = data->sensors; | |
928 | int err; | |
929 | ||
930 | /* Set up read-only sensors */ | |
931 | while (ro->label) { | |
932 | sysfs_attr_init(&sensors->dev_attr.attr); | |
933 | sensors->dev_attr.attr.name = ro->label; | |
934 | sensors->dev_attr.attr.mode = S_IRUGO; | |
935 | sensors->dev_attr.show = ro->show; | |
936 | sensors->index = ro->index; | |
937 | ||
938 | err = device_create_file(dev, &sensors->dev_attr); | |
939 | if (err) { | |
940 | sensors->dev_attr.attr.name = NULL; | |
941 | goto error; | |
942 | } | |
943 | sensors++; | |
944 | ro++; | |
945 | } | |
946 | ||
947 | /* Set up read-write sensors */ | |
948 | while (rw->label) { | |
949 | sysfs_attr_init(&sensors->dev_attr.attr); | |
950 | sensors->dev_attr.attr.name = rw->label; | |
951 | sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; | |
952 | sensors->dev_attr.show = rw->show; | |
953 | sensors->dev_attr.store = rw->set; | |
954 | sensors->index = rw->index; | |
955 | ||
956 | err = device_create_file(dev, &sensors->dev_attr); | |
957 | if (err) { | |
958 | sensors->dev_attr.attr.name = NULL; | |
959 | goto error; | |
960 | } | |
961 | sensors++; | |
962 | rw++; | |
963 | } | |
964 | ||
965 | err = device_create_file(dev, &sensor_dev_attr_name.dev_attr); | |
966 | if (err) | |
967 | goto error; | |
968 | err = device_create_file(dev, &sensor_dev_attr_version.dev_attr); | |
969 | return err; | |
970 | ||
971 | error: | |
972 | aem_remove_sensors(data); | |
973 | return err; | |
974 | } | |
975 | ||
976 | /* sysfs support functions for AEM2 sensors */ | |
977 | ||
978 | /* Display temperature use */ | |
979 | static ssize_t aem2_show_temp(struct device *dev, | |
980 | struct device_attribute *devattr, | |
981 | char *buf) | |
982 | { | |
983 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
984 | struct aem_data *a = dev_get_drvdata(dev); | |
985 | a->update(a); | |
986 | ||
987 | return sprintf(buf, "%u\n", a->temp[attr->index] * 1000); | |
988 | } | |
989 | ||
990 | /* Display power-capping registers */ | |
991 | static ssize_t aem2_show_pcap_value(struct device *dev, | |
992 | struct device_attribute *devattr, | |
993 | char *buf) | |
994 | { | |
995 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
996 | struct aem_data *a = dev_get_drvdata(dev); | |
997 | a->update(a); | |
998 | ||
999 | return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000); | |
1000 | } | |
1001 | ||
1002 | /* Remove sensors attached to an AEM device */ | |
1003 | static void aem_remove_sensors(struct aem_data *data) | |
1004 | { | |
1005 | int i; | |
1006 | ||
1007 | for (i = 0; i < AEM_NUM_SENSORS; i++) { | |
1008 | if (!data->sensors[i].dev_attr.attr.name) | |
1009 | continue; | |
1010 | device_remove_file(&data->pdev->dev, | |
1011 | &data->sensors[i].dev_attr); | |
1012 | } | |
1013 | ||
1014 | device_remove_file(&data->pdev->dev, | |
1015 | &sensor_dev_attr_name.dev_attr); | |
1016 | device_remove_file(&data->pdev->dev, | |
1017 | &sensor_dev_attr_version.dev_attr); | |
1018 | } | |
1019 | ||
1020 | /* Sensor probe functions */ | |
1021 | ||
1022 | /* Description of AEM1 sensors */ | |
1023 | static struct aem_ro_sensor_template aem1_ro_sensors[] = { | |
1024 | {"energy1_input", aem_show_energy, 0}, | |
1025 | {"power1_average", aem_show_power, 0}, | |
1026 | {NULL, NULL, 0}, | |
1027 | }; | |
1028 | ||
1029 | static struct aem_rw_sensor_template aem1_rw_sensors[] = { | |
1030 | {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, | |
1031 | {NULL, NULL, NULL, 0}, | |
1032 | }; | |
1033 | ||
1034 | /* Description of AEM2 sensors */ | |
1035 | static struct aem_ro_sensor_template aem2_ro_sensors[] = { | |
1036 | {"energy1_input", aem_show_energy, 0}, | |
1037 | {"energy2_input", aem_show_energy, 1}, | |
1038 | {"power1_average", aem_show_power, 0}, | |
1039 | {"power2_average", aem_show_power, 1}, | |
1040 | {"temp1_input", aem2_show_temp, 0}, | |
1041 | {"temp2_input", aem2_show_temp, 1}, | |
1042 | ||
1043 | {"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG}, | |
1044 | {"power5_average", aem2_show_pcap_value, POWER_CAP_MAX}, | |
1045 | {"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING}, | |
1046 | {"power7_average", aem2_show_pcap_value, POWER_CAP_MIN}, | |
1047 | ||
1048 | {"power3_average", aem2_show_pcap_value, POWER_AUX}, | |
1049 | {"power_cap", aem2_show_pcap_value, POWER_CAP}, | |
1050 | {NULL, NULL, 0}, | |
1051 | }; | |
1052 | ||
1053 | static struct aem_rw_sensor_template aem2_rw_sensors[] = { | |
1054 | {"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, | |
1055 | {"power2_average_interval", aem_show_power_period, aem_set_power_period, 1}, | |
1056 | {NULL, NULL, NULL, 0}, | |
1057 | }; | |
1058 | ||
1059 | /* Set up AEM1 sensor attrs */ | |
1060 | static int aem1_find_sensors(struct aem_data *data) | |
1061 | { | |
1062 | return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors); | |
1063 | } | |
1064 | ||
1065 | /* Set up AEM2 sensor attrs */ | |
1066 | static int aem2_find_sensors(struct aem_data *data) | |
1067 | { | |
1068 | return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors); | |
1069 | } | |
1070 | ||
1071 | /* Module init/exit routines */ | |
1072 | ||
1073 | static int __init aem_init(void) | |
1074 | { | |
1075 | int res; | |
1076 | ||
1077 | res = driver_register(&aem_driver.driver); | |
1078 | if (res) { | |
1079 | pr_err("Can't register aem driver\n"); | |
1080 | return res; | |
1081 | } | |
1082 | ||
1083 | res = ipmi_smi_watcher_register(&driver_data.bmc_events); | |
1084 | if (res) | |
1085 | goto ipmi_reg_err; | |
1086 | return 0; | |
1087 | ||
1088 | ipmi_reg_err: | |
1089 | driver_unregister(&aem_driver.driver); | |
1090 | return res; | |
1091 | ||
1092 | } | |
1093 | ||
1094 | static void __exit aem_exit(void) | |
1095 | { | |
1096 | struct aem_data *p1, *next1; | |
1097 | ||
1098 | ipmi_smi_watcher_unregister(&driver_data.bmc_events); | |
1099 | driver_unregister(&aem_driver.driver); | |
1100 | list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) | |
1101 | aem_delete(p1); | |
1102 | } | |
1103 | ||
1104 | MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); | |
1105 | MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver"); | |
1106 | MODULE_LICENSE("GPL"); | |
1107 | ||
1108 | module_init(aem_init); | |
1109 | module_exit(aem_exit); | |
1110 | ||
1111 | MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*"); | |
1112 | MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*"); | |
1113 | MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*"); | |
1114 | MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*"); | |
1115 | MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*"); | |
1116 | MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*"); | |
1117 | MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*"); |