1 /* 2 * processor_thermal_device.c 3 * Copyright (c) 2014, Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 */ 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/pci.h> 19 #include <linux/interrupt.h> 20 #include <linux/platform_device.h> 21 #include <linux/acpi.h> 22 #include <linux/thermal.h> 23 #include "int340x_thermal_zone.h" 24 #include "../intel_soc_dts_iosf.h" 25 26 /* Broadwell-U/HSB thermal reporting device */ 27 #define PCI_DEVICE_ID_PROC_BDW_THERMAL 0x1603 28 #define PCI_DEVICE_ID_PROC_HSB_THERMAL 0x0A03 29 30 /* Skylake thermal reporting device */ 31 #define PCI_DEVICE_ID_PROC_SKL_THERMAL 0x1903 32 33 /* CannonLake thermal reporting device */ 34 #define PCI_DEVICE_ID_PROC_CNL_THERMAL 0x5a03 35 #define PCI_DEVICE_ID_PROC_CFL_THERMAL 0x3E83 36 37 /* Braswell thermal reporting device */ 38 #define PCI_DEVICE_ID_PROC_BSW_THERMAL 0x22DC 39 40 /* Broxton thermal reporting device */ 41 #define PCI_DEVICE_ID_PROC_BXT0_THERMAL 0x0A8C 42 #define PCI_DEVICE_ID_PROC_BXT1_THERMAL 0x1A8C 43 #define PCI_DEVICE_ID_PROC_BXTX_THERMAL 0x4A8C 44 #define PCI_DEVICE_ID_PROC_BXTP_THERMAL 0x5A8C 45 46 /* GeminiLake thermal reporting device */ 47 #define PCI_DEVICE_ID_PROC_GLK_THERMAL 0x318C 48 49 struct power_config { 50 u32 index; 51 u32 min_uw; 52 u32 max_uw; 53 u32 tmin_us; 54 u32 tmax_us; 55 u32 step_uw; 56 }; 57 58 struct proc_thermal_device { 59 struct device *dev; 60 struct acpi_device *adev; 61 struct power_config power_limits[2]; 62 struct int34x_thermal_zone *int340x_zone; 63 struct intel_soc_dts_sensors *soc_dts; 64 }; 65 66 enum proc_thermal_emum_mode_type { 67 PROC_THERMAL_NONE, 68 PROC_THERMAL_PCI, 69 PROC_THERMAL_PLATFORM_DEV 70 }; 71 72 /* 73 * We can have only one type of enumeration, PCI or Platform, 74 * not both. So we don't need instance specific data. 75 */ 76 static enum proc_thermal_emum_mode_type proc_thermal_emum_mode = 77 PROC_THERMAL_NONE; 78 79 #define POWER_LIMIT_SHOW(index, suffix) \ 80 static ssize_t power_limit_##index##_##suffix##_show(struct device *dev, \ 81 struct device_attribute *attr, \ 82 char *buf) \ 83 { \ 84 struct proc_thermal_device *proc_dev = dev_get_drvdata(dev); \ 85 \ 86 if (proc_thermal_emum_mode == PROC_THERMAL_NONE) { \ 87 dev_warn(dev, "Attempted to get power limit before device was initialized!\n"); \ 88 return 0; \ 89 } \ 90 \ 91 return sprintf(buf, "%lu\n",\ 92 (unsigned long)proc_dev->power_limits[index].suffix * 1000); \ 93 } 94 95 POWER_LIMIT_SHOW(0, min_uw) 96 POWER_LIMIT_SHOW(0, max_uw) 97 POWER_LIMIT_SHOW(0, step_uw) 98 POWER_LIMIT_SHOW(0, tmin_us) 99 POWER_LIMIT_SHOW(0, tmax_us) 100 101 POWER_LIMIT_SHOW(1, min_uw) 102 POWER_LIMIT_SHOW(1, max_uw) 103 POWER_LIMIT_SHOW(1, step_uw) 104 POWER_LIMIT_SHOW(1, tmin_us) 105 POWER_LIMIT_SHOW(1, tmax_us) 106 107 static DEVICE_ATTR_RO(power_limit_0_min_uw); 108 static DEVICE_ATTR_RO(power_limit_0_max_uw); 109 static DEVICE_ATTR_RO(power_limit_0_step_uw); 110 static DEVICE_ATTR_RO(power_limit_0_tmin_us); 111 static DEVICE_ATTR_RO(power_limit_0_tmax_us); 112 113 static DEVICE_ATTR_RO(power_limit_1_min_uw); 114 static DEVICE_ATTR_RO(power_limit_1_max_uw); 115 static DEVICE_ATTR_RO(power_limit_1_step_uw); 116 static DEVICE_ATTR_RO(power_limit_1_tmin_us); 117 static DEVICE_ATTR_RO(power_limit_1_tmax_us); 118 119 static struct attribute *power_limit_attrs[] = { 120 &dev_attr_power_limit_0_min_uw.attr, 121 &dev_attr_power_limit_1_min_uw.attr, 122 &dev_attr_power_limit_0_max_uw.attr, 123 &dev_attr_power_limit_1_max_uw.attr, 124 &dev_attr_power_limit_0_step_uw.attr, 125 &dev_attr_power_limit_1_step_uw.attr, 126 &dev_attr_power_limit_0_tmin_us.attr, 127 &dev_attr_power_limit_1_tmin_us.attr, 128 &dev_attr_power_limit_0_tmax_us.attr, 129 &dev_attr_power_limit_1_tmax_us.attr, 130 NULL 131 }; 132 133 static const struct attribute_group power_limit_attribute_group = { 134 .attrs = power_limit_attrs, 135 .name = "power_limits" 136 }; 137 138 static int stored_tjmax; /* since it is fixed, we can have local storage */ 139 140 static int get_tjmax(void) 141 { 142 u32 eax, edx; 143 u32 val; 144 int err; 145 146 err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); 147 if (err) 148 return err; 149 150 val = (eax >> 16) & 0xff; 151 if (val) 152 return val; 153 154 return -EINVAL; 155 } 156 157 static int read_temp_msr(int *temp) 158 { 159 int cpu; 160 u32 eax, edx; 161 int err; 162 unsigned long curr_temp_off = 0; 163 164 *temp = 0; 165 166 for_each_online_cpu(cpu) { 167 err = rdmsr_safe_on_cpu(cpu, MSR_IA32_THERM_STATUS, &eax, 168 &edx); 169 if (err) 170 goto err_ret; 171 else { 172 if (eax & 0x80000000) { 173 curr_temp_off = (eax >> 16) & 0x7f; 174 if (!*temp || curr_temp_off < *temp) 175 *temp = curr_temp_off; 176 } else { 177 err = -EINVAL; 178 goto err_ret; 179 } 180 } 181 } 182 183 return 0; 184 err_ret: 185 return err; 186 } 187 188 static int proc_thermal_get_zone_temp(struct thermal_zone_device *zone, 189 int *temp) 190 { 191 int ret; 192 193 ret = read_temp_msr(temp); 194 if (!ret) 195 *temp = (stored_tjmax - *temp) * 1000; 196 197 return ret; 198 } 199 200 static struct thermal_zone_device_ops proc_thermal_local_ops = { 201 .get_temp = proc_thermal_get_zone_temp, 202 }; 203 204 static int proc_thermal_read_ppcc(struct proc_thermal_device *proc_priv) 205 { 206 int i; 207 acpi_status status; 208 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; 209 union acpi_object *elements, *ppcc; 210 union acpi_object *p; 211 int ret = 0; 212 213 status = acpi_evaluate_object(proc_priv->adev->handle, "PPCC", 214 NULL, &buf); 215 if (ACPI_FAILURE(status)) 216 return -ENODEV; 217 218 p = buf.pointer; 219 if (!p || (p->type != ACPI_TYPE_PACKAGE)) { 220 dev_err(proc_priv->dev, "Invalid PPCC data\n"); 221 ret = -EFAULT; 222 goto free_buffer; 223 } 224 225 if (!p->package.count) { 226 dev_err(proc_priv->dev, "Invalid PPCC package size\n"); 227 ret = -EFAULT; 228 goto free_buffer; 229 } 230 231 for (i = 0; i < min((int)p->package.count - 1, 2); ++i) { 232 elements = &(p->package.elements[i+1]); 233 if (elements->type != ACPI_TYPE_PACKAGE || 234 elements->package.count != 6) { 235 ret = -EFAULT; 236 goto free_buffer; 237 } 238 ppcc = elements->package.elements; 239 proc_priv->power_limits[i].index = ppcc[0].integer.value; 240 proc_priv->power_limits[i].min_uw = ppcc[1].integer.value; 241 proc_priv->power_limits[i].max_uw = ppcc[2].integer.value; 242 proc_priv->power_limits[i].tmin_us = ppcc[3].integer.value; 243 proc_priv->power_limits[i].tmax_us = ppcc[4].integer.value; 244 proc_priv->power_limits[i].step_uw = ppcc[5].integer.value; 245 } 246 247 free_buffer: 248 kfree(buf.pointer); 249 250 return ret; 251 } 252 253 #define PROC_POWER_CAPABILITY_CHANGED 0x83 254 static void proc_thermal_notify(acpi_handle handle, u32 event, void *data) 255 { 256 struct proc_thermal_device *proc_priv = data; 257 258 if (!proc_priv) 259 return; 260 261 switch (event) { 262 case PROC_POWER_CAPABILITY_CHANGED: 263 proc_thermal_read_ppcc(proc_priv); 264 int340x_thermal_zone_device_update(proc_priv->int340x_zone, 265 THERMAL_DEVICE_POWER_CAPABILITY_CHANGED); 266 break; 267 default: 268 dev_dbg(proc_priv->dev, "Unsupported event [0x%x]\n", event); 269 break; 270 } 271 } 272 273 274 static int proc_thermal_add(struct device *dev, 275 struct proc_thermal_device **priv) 276 { 277 struct proc_thermal_device *proc_priv; 278 struct acpi_device *adev; 279 acpi_status status; 280 unsigned long long tmp; 281 struct thermal_zone_device_ops *ops = NULL; 282 int ret; 283 284 adev = ACPI_COMPANION(dev); 285 if (!adev) 286 return -ENODEV; 287 288 proc_priv = devm_kzalloc(dev, sizeof(*proc_priv), GFP_KERNEL); 289 if (!proc_priv) 290 return -ENOMEM; 291 292 proc_priv->dev = dev; 293 proc_priv->adev = adev; 294 *priv = proc_priv; 295 296 ret = proc_thermal_read_ppcc(proc_priv); 297 if (ret) 298 return ret; 299 300 status = acpi_evaluate_integer(adev->handle, "_TMP", NULL, &tmp); 301 if (ACPI_FAILURE(status)) { 302 /* there is no _TMP method, add local method */ 303 stored_tjmax = get_tjmax(); 304 if (stored_tjmax > 0) 305 ops = &proc_thermal_local_ops; 306 } 307 308 proc_priv->int340x_zone = int340x_thermal_zone_add(adev, ops); 309 if (IS_ERR(proc_priv->int340x_zone)) { 310 return PTR_ERR(proc_priv->int340x_zone); 311 } else 312 ret = 0; 313 314 ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 315 proc_thermal_notify, 316 (void *)proc_priv); 317 if (ret) 318 goto remove_zone; 319 320 return 0; 321 322 remove_zone: 323 int340x_thermal_zone_remove(proc_priv->int340x_zone); 324 325 return ret; 326 } 327 328 static void proc_thermal_remove(struct proc_thermal_device *proc_priv) 329 { 330 acpi_remove_notify_handler(proc_priv->adev->handle, 331 ACPI_DEVICE_NOTIFY, proc_thermal_notify); 332 int340x_thermal_zone_remove(proc_priv->int340x_zone); 333 sysfs_remove_group(&proc_priv->dev->kobj, 334 &power_limit_attribute_group); 335 } 336 337 static int int3401_add(struct platform_device *pdev) 338 { 339 struct proc_thermal_device *proc_priv; 340 int ret; 341 342 if (proc_thermal_emum_mode == PROC_THERMAL_PCI) { 343 dev_err(&pdev->dev, "error: enumerated as PCI dev\n"); 344 return -ENODEV; 345 } 346 347 ret = proc_thermal_add(&pdev->dev, &proc_priv); 348 if (ret) 349 return ret; 350 351 platform_set_drvdata(pdev, proc_priv); 352 proc_thermal_emum_mode = PROC_THERMAL_PLATFORM_DEV; 353 354 dev_info(&pdev->dev, "Creating sysfs group for PROC_THERMAL_PLATFORM_DEV\n"); 355 356 return sysfs_create_group(&pdev->dev.kobj, 357 &power_limit_attribute_group); 358 } 359 360 static int int3401_remove(struct platform_device *pdev) 361 { 362 proc_thermal_remove(platform_get_drvdata(pdev)); 363 364 return 0; 365 } 366 367 static irqreturn_t proc_thermal_pci_msi_irq(int irq, void *devid) 368 { 369 struct proc_thermal_device *proc_priv; 370 struct pci_dev *pdev = devid; 371 372 proc_priv = pci_get_drvdata(pdev); 373 374 intel_soc_dts_iosf_interrupt_handler(proc_priv->soc_dts); 375 376 return IRQ_HANDLED; 377 } 378 379 static int proc_thermal_pci_probe(struct pci_dev *pdev, 380 const struct pci_device_id *unused) 381 { 382 struct proc_thermal_device *proc_priv; 383 int ret; 384 385 if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) { 386 dev_err(&pdev->dev, "error: enumerated as platform dev\n"); 387 return -ENODEV; 388 } 389 390 ret = pci_enable_device(pdev); 391 if (ret < 0) { 392 dev_err(&pdev->dev, "error: could not enable device\n"); 393 return ret; 394 } 395 396 ret = proc_thermal_add(&pdev->dev, &proc_priv); 397 if (ret) { 398 pci_disable_device(pdev); 399 return ret; 400 } 401 402 pci_set_drvdata(pdev, proc_priv); 403 proc_thermal_emum_mode = PROC_THERMAL_PCI; 404 405 if (pdev->device == PCI_DEVICE_ID_PROC_BSW_THERMAL) { 406 /* 407 * Enumerate additional DTS sensors available via IOSF. 408 * But we are not treating as a failure condition, if 409 * there are no aux DTSs enabled or fails. This driver 410 * already exposes sensors, which can be accessed via 411 * ACPI/MSR. So we don't want to fail for auxiliary DTSs. 412 */ 413 proc_priv->soc_dts = intel_soc_dts_iosf_init( 414 INTEL_SOC_DTS_INTERRUPT_MSI, 2, 0); 415 416 if (!IS_ERR(proc_priv->soc_dts) && pdev->irq) { 417 ret = pci_enable_msi(pdev); 418 if (!ret) { 419 ret = request_threaded_irq(pdev->irq, NULL, 420 proc_thermal_pci_msi_irq, 421 IRQF_ONESHOT, "proc_thermal", 422 pdev); 423 if (ret) { 424 intel_soc_dts_iosf_exit( 425 proc_priv->soc_dts); 426 pci_disable_msi(pdev); 427 proc_priv->soc_dts = NULL; 428 } 429 } 430 } else 431 dev_err(&pdev->dev, "No auxiliary DTSs enabled\n"); 432 } 433 434 dev_info(&pdev->dev, "Creating sysfs group for PROC_THERMAL_PCI\n"); 435 436 return sysfs_create_group(&pdev->dev.kobj, 437 &power_limit_attribute_group); 438 } 439 440 static void proc_thermal_pci_remove(struct pci_dev *pdev) 441 { 442 struct proc_thermal_device *proc_priv = pci_get_drvdata(pdev); 443 444 if (proc_priv->soc_dts) { 445 intel_soc_dts_iosf_exit(proc_priv->soc_dts); 446 if (pdev->irq) { 447 free_irq(pdev->irq, pdev); 448 pci_disable_msi(pdev); 449 } 450 } 451 proc_thermal_remove(proc_priv); 452 pci_disable_device(pdev); 453 } 454 455 static const struct pci_device_id proc_thermal_pci_ids[] = { 456 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BDW_THERMAL)}, 457 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_HSB_THERMAL)}, 458 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_SKL_THERMAL)}, 459 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BSW_THERMAL)}, 460 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT0_THERMAL)}, 461 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT1_THERMAL)}, 462 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXTX_THERMAL)}, 463 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXTP_THERMAL)}, 464 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_CNL_THERMAL)}, 465 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_CFL_THERMAL)}, 466 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_GLK_THERMAL)}, 467 { 0, }, 468 }; 469 470 MODULE_DEVICE_TABLE(pci, proc_thermal_pci_ids); 471 472 static struct pci_driver proc_thermal_pci_driver = { 473 .name = "proc_thermal", 474 .probe = proc_thermal_pci_probe, 475 .remove = proc_thermal_pci_remove, 476 .id_table = proc_thermal_pci_ids, 477 }; 478 479 static const struct acpi_device_id int3401_device_ids[] = { 480 {"INT3401", 0}, 481 {"", 0}, 482 }; 483 MODULE_DEVICE_TABLE(acpi, int3401_device_ids); 484 485 static struct platform_driver int3401_driver = { 486 .probe = int3401_add, 487 .remove = int3401_remove, 488 .driver = { 489 .name = "int3401 thermal", 490 .acpi_match_table = int3401_device_ids, 491 }, 492 }; 493 494 static int __init proc_thermal_init(void) 495 { 496 int ret; 497 498 ret = platform_driver_register(&int3401_driver); 499 if (ret) 500 return ret; 501 502 ret = pci_register_driver(&proc_thermal_pci_driver); 503 504 return ret; 505 } 506 507 static void __exit proc_thermal_exit(void) 508 { 509 platform_driver_unregister(&int3401_driver); 510 pci_unregister_driver(&proc_thermal_pci_driver); 511 } 512 513 module_init(proc_thermal_init); 514 module_exit(proc_thermal_exit); 515 516 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 517 MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver"); 518 MODULE_LICENSE("GPL v2"); 519