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ibmaem.c
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linux-6.19.14/drivers/hwmon/ibmaem.c
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * A hwmon driver for the IBM System Director Active Energy Manager (AEM) 4 * temperature/power/energy sensors and capping functionality. 5 * Copyright (C) 2008 IBM 6 * 7 * Author: Darrick J. Wong <darrick.wong@oracle.com> 8 */ 9 10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12#include <linux/ipmi.h> 13#include <linux/module.h> 14#include <linux/hwmon.h> 15#include <linux/hwmon-sysfs.h> 16#include <linux/jiffies.h> 17#include <linux/mutex.h> 18#include <linux/kdev_t.h> 19#include <linux/spinlock.h> 20#include <linux/idr.h> 21#include <linux/slab.h> 22#include <linux/sched.h> 23#include <linux/platform_device.h> 24#include <linux/math64.h> 25#include <linux/time.h> 26#include <linux/err.h> 27 28#define REFRESH_INTERVAL (HZ) 29#define IPMI_TIMEOUT (30 * HZ) 30#define DRVNAME "aem" 31 32#define AEM_NETFN 0x2E 33 34#define AEM_FIND_FW_CMD 0x80 35#define AEM_ELEMENT_CMD 0x81 36#define AEM_FW_INSTANCE_CMD 0x82 37 38#define AEM_READ_ELEMENT_CFG 0x80 39#define AEM_READ_BUFFER 0x81 40#define AEM_READ_REGISTER 0x82 41#define AEM_WRITE_REGISTER 0x83 42#define AEM_SET_REG_MASK 0x84 43#define AEM_CLEAR_REG_MASK 0x85 44#define AEM_READ_ELEMENT_CFG2 0x86 45 46#define AEM_CONTROL_ELEMENT 0 47#define AEM_ENERGY_ELEMENT 1 48#define AEM_CLOCK_ELEMENT 4 49#define AEM_POWER_CAP_ELEMENT 7 50#define AEM_EXHAUST_ELEMENT 9 51#define AEM_POWER_ELEMENT 10 52 53#define AEM_MODULE_TYPE_ID 0x0001 54 55#define AEM2_NUM_ENERGY_REGS 2 56#define AEM2_NUM_PCAP_REGS 6 57#define AEM2_NUM_TEMP_REGS 2 58#define AEM2_NUM_SENSORS 14 59 60#define AEM1_NUM_ENERGY_REGS 1 61#define AEM1_NUM_SENSORS 3 62 63/* AEM 2.x has more energy registers */ 64#define AEM_NUM_ENERGY_REGS AEM2_NUM_ENERGY_REGS 65/* AEM 2.x needs more sensor files */ 66#define AEM_NUM_SENSORS AEM2_NUM_SENSORS 67 68#define POWER_CAP 0 69#define POWER_CAP_MAX_HOTPLUG 1 70#define POWER_CAP_MAX 2 71#define POWER_CAP_MIN_WARNING 3 72#define POWER_CAP_MIN 4 73#define POWER_AUX 5 74 75#define AEM_DEFAULT_POWER_INTERVAL 1000 76#define AEM_MIN_POWER_INTERVAL 200 77#define UJ_PER_MJ 1000L 78 79static DEFINE_IDA(aem_ida); 80 81static struct platform_driver aem_driver = { 82 .driver = { 83 .name = DRVNAME, 84 .bus = &platform_bus_type, 85 } 86}; 87 88struct aem_ipmi_data { 89 struct completion read_complete; 90 struct ipmi_addr address; 91 struct ipmi_user *user; 92 int interface; 93 94 struct kernel_ipmi_msg tx_message; 95 long tx_msgid; 96 97 void *rx_msg_data; 98 unsigned short rx_msg_len; 99 unsigned char rx_result; 100 int rx_recv_type; 101 102 struct device *bmc_device; 103}; 104 105struct aem_ro_sensor_template { 106 char *label; 107 ssize_t (*show)(struct device *dev, 108 struct device_attribute *devattr, 109 char *buf); 110 int index; 111}; 112 113struct aem_rw_sensor_template { 114 char *label; 115 ssize_t (*show)(struct device *dev, 116 struct device_attribute *devattr, 117 char *buf); 118 ssize_t (*set)(struct device *dev, 119 struct device_attribute *devattr, 120 const char *buf, size_t count); 121 int index; 122}; 123 124struct aem_data { 125 struct list_head list; 126 127 struct device *hwmon_dev; 128 struct platform_device *pdev; 129 struct mutex lock; 130 bool valid; 131 unsigned long last_updated; /* In jiffies */ 132 u8 ver_major; 133 u8 ver_minor; 134 u8 module_handle; 135 int id; 136 struct aem_ipmi_data ipmi; 137 138 /* Function and buffer to update sensors */ 139 void (*update)(struct aem_data *data); 140 struct aem_read_sensor_resp *rs_resp; 141 142 /* 143 * AEM 1.x sensors: 144 * Available sensors: 145 * Energy meter 146 * Power meter 147 * 148 * AEM 2.x sensors: 149 * Two energy meters 150 * Two power meters 151 * Two temperature sensors 152 * Six power cap registers 153 */ 154 155 /* sysfs attrs */ 156 struct sensor_device_attribute sensors[AEM_NUM_SENSORS]; 157 158 /* energy use in mJ */ 159 u64 energy[AEM_NUM_ENERGY_REGS]; 160 161 /* power sampling interval in ms */ 162 unsigned long power_period[AEM_NUM_ENERGY_REGS]; 163 164 /* Everything past here is for AEM2 only */ 165 166 /* power caps in dW */ 167 u16 pcap[AEM2_NUM_PCAP_REGS]; 168 169 /* exhaust temperature in C */ 170 u8 temp[AEM2_NUM_TEMP_REGS]; 171}; 172 173/* Data structures returned by the AEM firmware */ 174struct aem_iana_id { 175 u8 bytes[3]; 176}; 177static struct aem_iana_id system_x_id = { 178 .bytes = {0x4D, 0x4F, 0x00} 179}; 180 181/* These are used to find AEM1 instances */ 182struct aem_find_firmware_req { 183 struct aem_iana_id id; 184 u8 rsvd; 185 __be16 index; 186 __be16 module_type_id; 187} __packed; 188 189struct aem_find_firmware_resp { 190 struct aem_iana_id id; 191 u8 num_instances; 192} __packed; 193 194/* These are used to find AEM2 instances */ 195struct aem_find_instance_req { 196 struct aem_iana_id id; 197 u8 instance_number; 198 __be16 module_type_id; 199} __packed; 200 201struct aem_find_instance_resp { 202 struct aem_iana_id id; 203 u8 num_instances; 204 u8 major; 205 u8 minor; 206 u8 module_handle; 207 u16 record_id; 208} __packed; 209 210/* These are used to query sensors */ 211struct aem_read_sensor_req { 212 struct aem_iana_id id; 213 u8 module_handle; 214 u8 element; 215 u8 subcommand; 216 u8 reg; 217 u8 rx_buf_size; 218} __packed; 219 220struct aem_read_sensor_resp { 221 struct aem_iana_id id; 222 u8 bytes[]; 223} __packed; 224 225/* Data structures to talk to the IPMI layer */ 226struct aem_driver_data { 227 struct list_head aem_devices; 228 struct ipmi_smi_watcher bmc_events; 229 struct ipmi_user_hndl ipmi_hndlrs; 230}; 231 232static void aem_register_bmc(int iface, struct device *dev); 233static void aem_bmc_gone(int iface); 234static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data); 235 236static void aem_remove_sensors(struct aem_data *data); 237static int aem1_find_sensors(struct aem_data *data); 238static int aem2_find_sensors(struct aem_data *data); 239static void update_aem1_sensors(struct aem_data *data); 240static void update_aem2_sensors(struct aem_data *data); 241 242static struct aem_driver_data driver_data = { 243 .aem_devices = LIST_HEAD_INIT(driver_data.aem_devices), 244 .bmc_events = { 245 .owner = THIS_MODULE, 246 .new_smi = aem_register_bmc, 247 .smi_gone = aem_bmc_gone, 248 }, 249 .ipmi_hndlrs = { 250 .ipmi_recv_hndl = aem_msg_handler, 251 }, 252}; 253 254/* Functions to talk to the IPMI layer */ 255 256/* Initialize IPMI address, message buffers and user data */ 257static int aem_init_ipmi_data(struct aem_ipmi_data *data, int iface, 258 struct device *bmc) 259{ 260 int err; 261 262 init_completion(&data->read_complete); 263 data->bmc_device = bmc; 264 265 /* Initialize IPMI address */ 266 data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; 267 data->address.channel = IPMI_BMC_CHANNEL; 268 data->address.data[0] = 0; 269 data->interface = iface; 270 271 /* Initialize message buffers */ 272 data->tx_msgid = 0; 273 data->tx_message.netfn = AEM_NETFN; 274 275 /* Create IPMI messaging interface user */ 276 err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs, 277 data, &data->user); 278 if (err < 0) { 279 dev_err(bmc, 280 "Unable to register user with IPMI interface %d\n", 281 data->interface); 282 return err; 283 } 284 285 return 0; 286} 287 288/* Send an IPMI command */ 289static int aem_send_message(struct aem_ipmi_data *data) 290{ 291 int err; 292 293 err = ipmi_validate_addr(&data->address, sizeof(data->address)); 294 if (err) 295 goto out; 296 297 data->tx_msgid++; 298 err = ipmi_request_settime(data->user, &data->address, data->tx_msgid, 299 &data->tx_message, data, 0, 0, 0); 300 if (err) 301 goto out1; 302 303 return 0; 304out1: 305 dev_err(data->bmc_device, "request_settime=%x\n", err); 306 return err; 307out: 308 dev_err(data->bmc_device, "validate_addr=%x\n", err); 309 return err; 310} 311 312/* Dispatch IPMI messages to callers */ 313static void aem_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data) 314{ 315 unsigned short rx_len; 316 struct aem_ipmi_data *data = user_msg_data; 317 318 if (msg->msgid != data->tx_msgid) { 319 dev_err(data->bmc_device, 320 "Mismatch between received msgid (%02x) and transmitted msgid (%02x)!\n", 321 (int)msg->msgid, 322 (int)data->tx_msgid); 323 ipmi_free_recv_msg(msg); 324 return; 325 } 326 327 data->rx_recv_type = msg->recv_type; 328 if (msg->msg.data_len > 0) 329 data->rx_result = msg->msg.data[0]; 330 else 331 data->rx_result = IPMI_UNKNOWN_ERR_COMPLETION_CODE; 332 333 if (msg->msg.data_len > 1) { 334 rx_len = msg->msg.data_len - 1; 335 if (data->rx_msg_len < rx_len) 336 rx_len = data->rx_msg_len; 337 data->rx_msg_len = rx_len; 338 memcpy(data->rx_msg_data, msg->msg.data + 1, data->rx_msg_len); 339 } else 340 data->rx_msg_len = 0; 341 342 ipmi_free_recv_msg(msg); 343 complete(&data->read_complete); 344} 345 346/* Sensor support functions */ 347 348/* Read a sensor value; must be called with data->lock held */ 349static int aem_read_sensor(struct aem_data *data, u8 elt, u8 reg, 350 void *buf, size_t size) 351{ 352 int rs_size; 353 struct aem_read_sensor_req rs_req; 354 /* Use preallocated rx buffer */ 355 struct aem_read_sensor_resp *rs_resp = data->rs_resp; 356 struct aem_ipmi_data *ipmi = &data->ipmi; 357 358 /* AEM registers are 1, 2, 4 or 8 bytes */ 359 switch (size) { 360 case 1: 361 case 2: 362 case 4: 363 case 8: 364 break; 365 default: 366 return -EINVAL; 367 } 368 369 rs_req.id = system_x_id; 370 rs_req.module_handle = data->module_handle; 371 rs_req.element = elt; 372 rs_req.subcommand = AEM_READ_REGISTER; 373 rs_req.reg = reg; 374 rs_req.rx_buf_size = size; 375 376 ipmi->tx_message.cmd = AEM_ELEMENT_CMD; 377 ipmi->tx_message.data = (char *)&rs_req; 378 ipmi->tx_message.data_len = sizeof(rs_req); 379 380 rs_size = sizeof(*rs_resp) + size; 381 ipmi->rx_msg_data = rs_resp; 382 ipmi->rx_msg_len = rs_size; 383 384 aem_send_message(ipmi); 385 386 if (!wait_for_completion_timeout(&ipmi->read_complete, IPMI_TIMEOUT)) 387 return -ETIMEDOUT; 388 389 if (ipmi->rx_result || ipmi->rx_msg_len != rs_size || 390 memcmp(&rs_resp->id, &system_x_id, sizeof(system_x_id))) 391 return -ENOENT; 392 393 switch (size) { 394 case 1: { 395 u8 *x = buf; 396 *x = rs_resp->bytes[0]; 397 break; 398 } 399 case 2: { 400 u16 *x = buf; 401 *x = be16_to_cpup((__be16 *)rs_resp->bytes); 402 break; 403 } 404 case 4: { 405 u32 *x = buf; 406 *x = be32_to_cpup((__be32 *)rs_resp->bytes); 407 break; 408 } 409 case 8: { 410 u64 *x = buf; 411 *x = be64_to_cpup((__be64 *)rs_resp->bytes); 412 break; 413 } 414 } 415 416 return 0; 417} 418 419/* Update AEM energy registers */ 420static void update_aem_energy_one(struct aem_data *data, int which) 421{ 422 aem_read_sensor(data, AEM_ENERGY_ELEMENT, which, 423 &data->energy[which], 8); 424} 425 426static void update_aem_energy(struct aem_data *data) 427{ 428 update_aem_energy_one(data, 0); 429 if (data->ver_major < 2) 430 return; 431 update_aem_energy_one(data, 1); 432} 433 434/* Update all AEM1 sensors */ 435static void update_aem1_sensors(struct aem_data *data) 436{ 437 mutex_lock(&data->lock); 438 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && 439 data->valid) 440 goto out; 441 442 update_aem_energy(data); 443out: 444 mutex_unlock(&data->lock); 445} 446 447/* Update all AEM2 sensors */ 448static void update_aem2_sensors(struct aem_data *data) 449{ 450 int i; 451 452 mutex_lock(&data->lock); 453 if (time_before(jiffies, data->last_updated + REFRESH_INTERVAL) && 454 data->valid) 455 goto out; 456 457 update_aem_energy(data); 458 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 0, &data->temp[0], 1); 459 aem_read_sensor(data, AEM_EXHAUST_ELEMENT, 1, &data->temp[1], 1); 460 461 for (i = POWER_CAP; i <= POWER_AUX; i++) 462 aem_read_sensor(data, AEM_POWER_CAP_ELEMENT, i, 463 &data->pcap[i], 2); 464out: 465 mutex_unlock(&data->lock); 466} 467 468/* Delete an AEM instance */ 469static void aem_delete(struct aem_data *data) 470{ 471 list_del(&data->list); 472 aem_remove_sensors(data); 473 kfree(data->rs_resp); 474 hwmon_device_unregister(data->hwmon_dev); 475 ipmi_destroy_user(data->ipmi.user); 476 platform_set_drvdata(data->pdev, NULL); 477 platform_device_unregister(data->pdev); 478 ida_free(&aem_ida, data->id); 479 kfree(data); 480} 481 482/* Probe functions for AEM1 devices */ 483 484/* Retrieve version and module handle for an AEM1 instance */ 485static int aem_find_aem1_count(struct aem_ipmi_data *data) 486{ 487 struct aem_find_firmware_req ff_req; 488 struct aem_find_firmware_resp ff_resp; 489 490 ff_req.id = system_x_id; 491 ff_req.index = 0; 492 ff_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); 493 494 data->tx_message.cmd = AEM_FIND_FW_CMD; 495 data->tx_message.data = (char *)&ff_req; 496 data->tx_message.data_len = sizeof(ff_req); 497 498 data->rx_msg_data = &ff_resp; 499 data->rx_msg_len = sizeof(ff_resp); 500 501 aem_send_message(data); 502 503 if (!wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT)) 504 return -ETIMEDOUT; 505 506 if (data->rx_result || data->rx_msg_len != sizeof(ff_resp) || 507 memcmp(&ff_resp.id, &system_x_id, sizeof(system_x_id))) 508 return -ENOENT; 509 510 return ff_resp.num_instances; 511} 512 513/* Find and initialize one AEM1 instance */ 514static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle) 515{ 516 struct aem_data *data; 517 int i; 518 int res = -ENOMEM; 519 520 data = kzalloc(sizeof(*data), GFP_KERNEL); 521 if (!data) 522 return res; 523 mutex_init(&data->lock); 524 525 /* Copy instance data */ 526 data->ver_major = 1; 527 data->ver_minor = 0; 528 data->module_handle = module_handle; 529 for (i = 0; i < AEM1_NUM_ENERGY_REGS; i++) 530 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; 531 532 /* Create sub-device for this fw instance */ 533 data->id = ida_alloc(&aem_ida, GFP_KERNEL); 534 if (data->id < 0) 535 goto id_err; 536 537 data->pdev = platform_device_alloc(DRVNAME, data->id); 538 if (!data->pdev) 539 goto dev_err; 540 data->pdev->dev.driver = &aem_driver.driver; 541 542 res = platform_device_add(data->pdev); 543 if (res) 544 goto dev_add_err; 545 546 platform_set_drvdata(data->pdev, data); 547 548 /* Set up IPMI interface */ 549 res = aem_init_ipmi_data(&data->ipmi, probe->interface, 550 probe->bmc_device); 551 if (res) 552 goto ipmi_err; 553 554 /* Register with hwmon */ 555 data->hwmon_dev = hwmon_device_register(&data->pdev->dev); 556 if (IS_ERR(data->hwmon_dev)) { 557 dev_err(&data->pdev->dev, 558 "Unable to register hwmon device for IPMI interface %d\n", 559 probe->interface); 560 res = PTR_ERR(data->hwmon_dev); 561 goto hwmon_reg_err; 562 } 563 564 data->update = update_aem1_sensors; 565 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL); 566 if (!data->rs_resp) { 567 res = -ENOMEM; 568 goto alloc_resp_err; 569 } 570 571 /* Find sensors */ 572 res = aem1_find_sensors(data); 573 if (res) 574 goto sensor_err; 575 576 /* Add to our list of AEM devices */ 577 list_add_tail(&data->list, &driver_data.aem_devices); 578 579 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", 580 data->ver_major, data->ver_minor, 581 data->module_handle); 582 return 0; 583 584sensor_err: 585 kfree(data->rs_resp); 586alloc_resp_err: 587 hwmon_device_unregister(data->hwmon_dev); 588hwmon_reg_err: 589 ipmi_destroy_user(data->ipmi.user); 590ipmi_err: 591 platform_set_drvdata(data->pdev, NULL); 592 platform_device_del(data->pdev); 593dev_add_err: 594 platform_device_put(data->pdev); 595dev_err: 596 ida_free(&aem_ida, data->id); 597id_err: 598 kfree(data); 599 600 return res; 601} 602 603/* Find and initialize all AEM1 instances */ 604static void aem_init_aem1(struct aem_ipmi_data *probe) 605{ 606 int num, i, err; 607 608 num = aem_find_aem1_count(probe); 609 for (i = 0; i < num; i++) { 610 err = aem_init_aem1_inst(probe, i); 611 if (err) { 612 dev_err(probe->bmc_device, 613 "Error %d initializing AEM1 0x%X\n", 614 err, i); 615 } 616 } 617} 618 619/* Probe functions for AEM2 devices */ 620 621/* Retrieve version and module handle for an AEM2 instance */ 622static int aem_find_aem2(struct aem_ipmi_data *data, 623 struct aem_find_instance_resp *fi_resp, 624 int instance_num) 625{ 626 struct aem_find_instance_req fi_req; 627 628 fi_req.id = system_x_id; 629 fi_req.instance_number = instance_num; 630 fi_req.module_type_id = cpu_to_be16(AEM_MODULE_TYPE_ID); 631 632 data->tx_message.cmd = AEM_FW_INSTANCE_CMD; 633 data->tx_message.data = (char *)&fi_req; 634 data->tx_message.data_len = sizeof(fi_req); 635 636 data->rx_msg_data = fi_resp; 637 data->rx_msg_len = sizeof(*fi_resp); 638 639 aem_send_message(data); 640 641 if (!wait_for_completion_timeout(&data->read_complete, IPMI_TIMEOUT)) 642 return -ETIMEDOUT; 643 644 if (data->rx_result || data->rx_msg_len != sizeof(*fi_resp) || 645 memcmp(&fi_resp->id, &system_x_id, sizeof(system_x_id)) || 646 fi_resp->num_instances <= instance_num) 647 return -ENOENT; 648 649 return 0; 650} 651 652/* Find and initialize one AEM2 instance */ 653static int aem_init_aem2_inst(struct aem_ipmi_data *probe, 654 struct aem_find_instance_resp *fi_resp) 655{ 656 struct aem_data *data; 657 int i; 658 int res = -ENOMEM; 659 660 data = kzalloc(sizeof(*data), GFP_KERNEL); 661 if (!data) 662 return res; 663 mutex_init(&data->lock); 664 665 /* Copy instance data */ 666 data->ver_major = fi_resp->major; 667 data->ver_minor = fi_resp->minor; 668 data->module_handle = fi_resp->module_handle; 669 for (i = 0; i < AEM2_NUM_ENERGY_REGS; i++) 670 data->power_period[i] = AEM_DEFAULT_POWER_INTERVAL; 671 672 /* Create sub-device for this fw instance */ 673 data->id = ida_alloc(&aem_ida, GFP_KERNEL); 674 if (data->id < 0) 675 goto id_err; 676 677 data->pdev = platform_device_alloc(DRVNAME, data->id); 678 if (!data->pdev) 679 goto dev_err; 680 data->pdev->dev.driver = &aem_driver.driver; 681 682 res = platform_device_add(data->pdev); 683 if (res) 684 goto dev_add_err; 685 686 platform_set_drvdata(data->pdev, data); 687 688 /* Set up IPMI interface */ 689 res = aem_init_ipmi_data(&data->ipmi, probe->interface, 690 probe->bmc_device); 691 if (res) 692 goto ipmi_err; 693 694 /* Register with hwmon */ 695 data->hwmon_dev = hwmon_device_register(&data->pdev->dev); 696 if (IS_ERR(data->hwmon_dev)) { 697 dev_err(&data->pdev->dev, 698 "Unable to register hwmon device for IPMI interface %d\n", 699 probe->interface); 700 res = PTR_ERR(data->hwmon_dev); 701 goto hwmon_reg_err; 702 } 703 704 data->update = update_aem2_sensors; 705 data->rs_resp = kzalloc(sizeof(*(data->rs_resp)) + 8, GFP_KERNEL); 706 if (!data->rs_resp) { 707 res = -ENOMEM; 708 goto alloc_resp_err; 709 } 710 711 /* Find sensors */ 712 res = aem2_find_sensors(data); 713 if (res) 714 goto sensor_err; 715 716 /* Add to our list of AEM devices */ 717 list_add_tail(&data->list, &driver_data.aem_devices); 718 719 dev_info(data->ipmi.bmc_device, "Found AEM v%d.%d at 0x%X\n", 720 data->ver_major, data->ver_minor, 721 data->module_handle); 722 return 0; 723 724sensor_err: 725 kfree(data->rs_resp); 726alloc_resp_err: 727 hwmon_device_unregister(data->hwmon_dev); 728hwmon_reg_err: 729 ipmi_destroy_user(data->ipmi.user); 730ipmi_err: 731 platform_set_drvdata(data->pdev, NULL); 732 platform_device_del(data->pdev); 733dev_add_err: 734 platform_device_put(data->pdev); 735dev_err: 736 ida_free(&aem_ida, data->id); 737id_err: 738 kfree(data); 739 740 return res; 741} 742 743/* Find and initialize all AEM2 instances */ 744static void aem_init_aem2(struct aem_ipmi_data *probe) 745{ 746 struct aem_find_instance_resp fi_resp; 747 int err; 748 int i = 0; 749 750 while (!aem_find_aem2(probe, &fi_resp, i)) { 751 if (fi_resp.major != 2) { 752 dev_err(probe->bmc_device, 753 "Unknown AEM v%d; please report this to the maintainer.\n", 754 fi_resp.major); 755 i++; 756 continue; 757 } 758 err = aem_init_aem2_inst(probe, &fi_resp); 759 if (err) { 760 dev_err(probe->bmc_device, 761 "Error %d initializing AEM2 0x%X\n", 762 err, fi_resp.module_handle); 763 } 764 i++; 765 } 766} 767 768/* Probe a BMC for AEM firmware instances */ 769static void aem_register_bmc(int iface, struct device *dev) 770{ 771 struct aem_ipmi_data probe; 772 773 if (aem_init_ipmi_data(&probe, iface, dev)) 774 return; 775 776 /* Ignore probe errors; they won't cause problems */ 777 aem_init_aem1(&probe); 778 aem_init_aem2(&probe); 779 780 ipmi_destroy_user(probe.user); 781} 782 783/* Handle BMC deletion */ 784static void aem_bmc_gone(int iface) 785{ 786 struct aem_data *p1, *next1; 787 788 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) 789 if (p1->ipmi.interface == iface) 790 aem_delete(p1); 791} 792 793/* sysfs support functions */ 794 795/* AEM device name */ 796static ssize_t name_show(struct device *dev, struct device_attribute *devattr, 797 char *buf) 798{ 799 struct aem_data *data = dev_get_drvdata(dev); 800 801 return sprintf(buf, "%s%d\n", DRVNAME, data->ver_major); 802} 803static SENSOR_DEVICE_ATTR_RO(name, name, 0); 804 805/* AEM device version */ 806static ssize_t version_show(struct device *dev, 807 struct device_attribute *devattr, char *buf) 808{ 809 struct aem_data *data = dev_get_drvdata(dev); 810 811 return sprintf(buf, "%d.%d\n", data->ver_major, data->ver_minor); 812} 813static SENSOR_DEVICE_ATTR_RO(version, version, 0); 814 815/* Display power use */ 816static ssize_t aem_show_power(struct device *dev, 817 struct device_attribute *devattr, 818 char *buf) 819{ 820 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 821 struct aem_data *data = dev_get_drvdata(dev); 822 u64 before, after, delta, time; 823 signed long leftover; 824 825 mutex_lock(&data->lock); 826 update_aem_energy_one(data, attr->index); 827 time = ktime_get_ns(); 828 before = data->energy[attr->index]; 829 830 leftover = schedule_timeout_interruptible( 831 msecs_to_jiffies(data->power_period[attr->index]) 832 ); 833 if (leftover) { 834 mutex_unlock(&data->lock); 835 return 0; 836 } 837 838 update_aem_energy_one(data, attr->index); 839 time = ktime_get_ns() - time; 840 after = data->energy[attr->index]; 841 mutex_unlock(&data->lock); 842 843 delta = (after - before) * UJ_PER_MJ; 844 845 return sprintf(buf, "%llu\n", 846 (unsigned long long)div64_u64(delta * NSEC_PER_SEC, time)); 847} 848 849/* Display energy use */ 850static ssize_t aem_show_energy(struct device *dev, 851 struct device_attribute *devattr, 852 char *buf) 853{ 854 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 855 struct aem_data *a = dev_get_drvdata(dev); 856 mutex_lock(&a->lock); 857 update_aem_energy_one(a, attr->index); 858 mutex_unlock(&a->lock); 859 860 return sprintf(buf, "%llu\n", 861 (unsigned long long)a->energy[attr->index] * 1000); 862} 863 864/* Display power interval registers */ 865static ssize_t aem_show_power_period(struct device *dev, 866 struct device_attribute *devattr, 867 char *buf) 868{ 869 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 870 struct aem_data *a = dev_get_drvdata(dev); 871 a->update(a); 872 873 return sprintf(buf, "%lu\n", a->power_period[attr->index]); 874} 875 876/* Set power interval registers */ 877static ssize_t aem_set_power_period(struct device *dev, 878 struct device_attribute *devattr, 879 const char *buf, size_t count) 880{ 881 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 882 struct aem_data *a = dev_get_drvdata(dev); 883 unsigned long temp; 884 int res; 885 886 res = kstrtoul(buf, 10, &temp); 887 if (res) 888 return res; 889 890 if (temp < AEM_MIN_POWER_INTERVAL) 891 return -EINVAL; 892 893 mutex_lock(&a->lock); 894 a->power_period[attr->index] = temp; 895 mutex_unlock(&a->lock); 896 897 return count; 898} 899 900/* Discover sensors on an AEM device */ 901static int aem_register_sensors(struct aem_data *data, 902 const struct aem_ro_sensor_template *ro, 903 const struct aem_rw_sensor_template *rw) 904{ 905 struct device *dev = &data->pdev->dev; 906 struct sensor_device_attribute *sensors = data->sensors; 907 int err; 908 909 /* Set up read-only sensors */ 910 while (ro->label) { 911 sysfs_attr_init(&sensors->dev_attr.attr); 912 sensors->dev_attr.attr.name = ro->label; 913 sensors->dev_attr.attr.mode = 0444; 914 sensors->dev_attr.show = ro->show; 915 sensors->index = ro->index; 916 917 err = device_create_file(dev, &sensors->dev_attr); 918 if (err) { 919 sensors->dev_attr.attr.name = NULL; 920 goto error; 921 } 922 sensors++; 923 ro++; 924 } 925 926 /* Set up read-write sensors */ 927 while (rw->label) { 928 sysfs_attr_init(&sensors->dev_attr.attr); 929 sensors->dev_attr.attr.name = rw->label; 930 sensors->dev_attr.attr.mode = 0644; 931 sensors->dev_attr.show = rw->show; 932 sensors->dev_attr.store = rw->set; 933 sensors->index = rw->index; 934 935 err = device_create_file(dev, &sensors->dev_attr); 936 if (err) { 937 sensors->dev_attr.attr.name = NULL; 938 goto error; 939 } 940 sensors++; 941 rw++; 942 } 943 944 err = device_create_file(dev, &sensor_dev_attr_name.dev_attr); 945 if (err) 946 goto error; 947 err = device_create_file(dev, &sensor_dev_attr_version.dev_attr); 948 return err; 949 950error: 951 aem_remove_sensors(data); 952 return err; 953} 954 955/* sysfs support functions for AEM2 sensors */ 956 957/* Display temperature use */ 958static ssize_t aem2_show_temp(struct device *dev, 959 struct device_attribute *devattr, 960 char *buf) 961{ 962 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 963 struct aem_data *a = dev_get_drvdata(dev); 964 a->update(a); 965 966 return sprintf(buf, "%u\n", a->temp[attr->index] * 1000); 967} 968 969/* Display power-capping registers */ 970static ssize_t aem2_show_pcap_value(struct device *dev, 971 struct device_attribute *devattr, 972 char *buf) 973{ 974 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 975 struct aem_data *a = dev_get_drvdata(dev); 976 a->update(a); 977 978 return sprintf(buf, "%u\n", a->pcap[attr->index] * 100000); 979} 980 981/* Remove sensors attached to an AEM device */ 982static void aem_remove_sensors(struct aem_data *data) 983{ 984 int i; 985 986 for (i = 0; i < AEM_NUM_SENSORS; i++) { 987 if (!data->sensors[i].dev_attr.attr.name) 988 continue; 989 device_remove_file(&data->pdev->dev, 990 &data->sensors[i].dev_attr); 991 } 992 993 device_remove_file(&data->pdev->dev, 994 &sensor_dev_attr_name.dev_attr); 995 device_remove_file(&data->pdev->dev, 996 &sensor_dev_attr_version.dev_attr); 997} 998 999/* Sensor probe functions */ 1000 1001/* Description of AEM1 sensors */ 1002static const struct aem_ro_sensor_template aem1_ro_sensors[] = { 1003{"energy1_input", aem_show_energy, 0}, 1004{"power1_average", aem_show_power, 0}, 1005{NULL, NULL, 0}, 1006}; 1007 1008static const struct aem_rw_sensor_template aem1_rw_sensors[] = { 1009{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, 1010{NULL, NULL, NULL, 0}, 1011}; 1012 1013/* Description of AEM2 sensors */ 1014static const struct aem_ro_sensor_template aem2_ro_sensors[] = { 1015{"energy1_input", aem_show_energy, 0}, 1016{"energy2_input", aem_show_energy, 1}, 1017{"power1_average", aem_show_power, 0}, 1018{"power2_average", aem_show_power, 1}, 1019{"temp1_input", aem2_show_temp, 0}, 1020{"temp2_input", aem2_show_temp, 1}, 1021 1022{"power4_average", aem2_show_pcap_value, POWER_CAP_MAX_HOTPLUG}, 1023{"power5_average", aem2_show_pcap_value, POWER_CAP_MAX}, 1024{"power6_average", aem2_show_pcap_value, POWER_CAP_MIN_WARNING}, 1025{"power7_average", aem2_show_pcap_value, POWER_CAP_MIN}, 1026 1027{"power3_average", aem2_show_pcap_value, POWER_AUX}, 1028{"power_cap", aem2_show_pcap_value, POWER_CAP}, 1029{NULL, NULL, 0}, 1030}; 1031 1032static const struct aem_rw_sensor_template aem2_rw_sensors[] = { 1033{"power1_average_interval", aem_show_power_period, aem_set_power_period, 0}, 1034{"power2_average_interval", aem_show_power_period, aem_set_power_period, 1}, 1035{NULL, NULL, NULL, 0}, 1036}; 1037 1038/* Set up AEM1 sensor attrs */ 1039static int aem1_find_sensors(struct aem_data *data) 1040{ 1041 return aem_register_sensors(data, aem1_ro_sensors, aem1_rw_sensors); 1042} 1043 1044/* Set up AEM2 sensor attrs */ 1045static int aem2_find_sensors(struct aem_data *data) 1046{ 1047 return aem_register_sensors(data, aem2_ro_sensors, aem2_rw_sensors); 1048} 1049 1050/* Module init/exit routines */ 1051 1052static int __init aem_init(void) 1053{ 1054 int res; 1055 1056 res = driver_register(&aem_driver.driver); 1057 if (res) { 1058 pr_err("Can't register aem driver\n"); 1059 return res; 1060 } 1061 1062 res = ipmi_smi_watcher_register(&driver_data.bmc_events); 1063 if (res) 1064 goto ipmi_reg_err; 1065 return 0; 1066 1067ipmi_reg_err: 1068 driver_unregister(&aem_driver.driver); 1069 return res; 1070 1071} 1072 1073static void __exit aem_exit(void) 1074{ 1075 struct aem_data *p1, *next1; 1076 1077 ipmi_smi_watcher_unregister(&driver_data.bmc_events); 1078 driver_unregister(&aem_driver.driver); 1079 list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list) 1080 aem_delete(p1); 1081} 1082 1083MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); 1084MODULE_DESCRIPTION("IBM AEM power/temp/energy sensor driver"); 1085MODULE_LICENSE("GPL"); 1086 1087module_init(aem_init); 1088module_exit(aem_exit); 1089 1090MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3350-*"); 1091MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3550-*"); 1092MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3650-*"); 1093MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3655-*"); 1094MODULE_ALIAS("dmi:bvnIBM:*:pnIBMSystemx3755-*"); 1095MODULE_ALIAS("dmi:bvnIBM:*:pnIBM3850M2/x3950M2-*"); 1096MODULE_ALIAS("dmi:bvnIBM:*:pnIBMBladeHC10-*");
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