1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * processor_thermal_device.c 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 #include <linux/acpi.h> 7 #include <linux/intel_tcc.h> 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/pci.h> 11 #include <linux/thermal.h> 12 #include "int340x_thermal_zone.h" 13 #include "processor_thermal_device.h" 14 #include "../intel_soc_dts_iosf.h" 15 16 #define DRV_NAME "proc_thermal" 17 18 #define POWER_LIMIT_SHOW(index, suffix) \ 19 static ssize_t power_limit_##index##_##suffix##_show(struct device *dev, \ 20 struct device_attribute *attr, \ 21 char *buf) \ 22 { \ 23 struct proc_thermal_device *proc_dev = dev_get_drvdata(dev); \ 24 \ 25 return sprintf(buf, "%lu\n",\ 26 (unsigned long)proc_dev->power_limits[index].suffix * 1000); \ 27 } 28 29 static ssize_t power_floor_status_show(struct device *dev, 30 struct device_attribute *attr, 31 char *buf) 32 { 33 struct proc_thermal_device *proc_dev = dev_get_drvdata(dev); 34 int ret; 35 36 ret = proc_thermal_read_power_floor_status(proc_dev); 37 38 return sysfs_emit(buf, "%d\n", ret); 39 } 40 41 static ssize_t power_floor_enable_show(struct device *dev, 42 struct device_attribute *attr, 43 char *buf) 44 { 45 struct proc_thermal_device *proc_dev = dev_get_drvdata(dev); 46 bool ret; 47 48 ret = proc_thermal_power_floor_get_state(proc_dev); 49 50 return sysfs_emit(buf, "%d\n", ret); 51 } 52 53 static ssize_t power_floor_enable_store(struct device *dev, 54 struct device_attribute *attr, 55 const char *buf, size_t count) 56 { 57 struct proc_thermal_device *proc_dev = dev_get_drvdata(dev); 58 u8 state; 59 int ret; 60 61 if (kstrtou8(buf, 0, &state)) 62 return -EINVAL; 63 64 ret = proc_thermal_power_floor_set_state(proc_dev, !!state); 65 if (ret) 66 return ret; 67 68 return count; 69 } 70 71 POWER_LIMIT_SHOW(0, min_uw) 72 POWER_LIMIT_SHOW(0, max_uw) 73 POWER_LIMIT_SHOW(0, step_uw) 74 POWER_LIMIT_SHOW(0, tmin_us) 75 POWER_LIMIT_SHOW(0, tmax_us) 76 77 POWER_LIMIT_SHOW(1, min_uw) 78 POWER_LIMIT_SHOW(1, max_uw) 79 POWER_LIMIT_SHOW(1, step_uw) 80 POWER_LIMIT_SHOW(1, tmin_us) 81 POWER_LIMIT_SHOW(1, tmax_us) 82 83 static DEVICE_ATTR_RO(power_limit_0_min_uw); 84 static DEVICE_ATTR_RO(power_limit_0_max_uw); 85 static DEVICE_ATTR_RO(power_limit_0_step_uw); 86 static DEVICE_ATTR_RO(power_limit_0_tmin_us); 87 static DEVICE_ATTR_RO(power_limit_0_tmax_us); 88 89 static DEVICE_ATTR_RO(power_limit_1_min_uw); 90 static DEVICE_ATTR_RO(power_limit_1_max_uw); 91 static DEVICE_ATTR_RO(power_limit_1_step_uw); 92 static DEVICE_ATTR_RO(power_limit_1_tmin_us); 93 static DEVICE_ATTR_RO(power_limit_1_tmax_us); 94 95 static DEVICE_ATTR_RO(power_floor_status); 96 static DEVICE_ATTR_RW(power_floor_enable); 97 98 static struct attribute *power_limit_attrs[] = { 99 &dev_attr_power_limit_0_min_uw.attr, 100 &dev_attr_power_limit_1_min_uw.attr, 101 &dev_attr_power_limit_0_max_uw.attr, 102 &dev_attr_power_limit_1_max_uw.attr, 103 &dev_attr_power_limit_0_step_uw.attr, 104 &dev_attr_power_limit_1_step_uw.attr, 105 &dev_attr_power_limit_0_tmin_us.attr, 106 &dev_attr_power_limit_1_tmin_us.attr, 107 &dev_attr_power_limit_0_tmax_us.attr, 108 &dev_attr_power_limit_1_tmax_us.attr, 109 &dev_attr_power_floor_status.attr, 110 &dev_attr_power_floor_enable.attr, 111 NULL 112 }; 113 114 static umode_t power_limit_attr_visible(struct kobject *kobj, struct attribute *attr, int unused) 115 { 116 struct device *dev = kobj_to_dev(kobj); 117 struct proc_thermal_device *proc_dev; 118 119 if (attr != &dev_attr_power_floor_status.attr && attr != &dev_attr_power_floor_enable.attr) 120 return attr->mode; 121 122 proc_dev = dev_get_drvdata(dev); 123 if (!proc_dev || !(proc_dev->mmio_feature_mask & PROC_THERMAL_FEATURE_POWER_FLOOR)) 124 return 0; 125 126 return attr->mode; 127 } 128 129 static const struct attribute_group power_limit_attribute_group = { 130 .attrs = power_limit_attrs, 131 .name = "power_limits", 132 .is_visible = power_limit_attr_visible, 133 }; 134 135 static ssize_t tcc_offset_degree_celsius_show(struct device *dev, 136 struct device_attribute *attr, 137 char *buf) 138 { 139 int offset; 140 141 offset = intel_tcc_get_offset(-1); 142 if (offset < 0) 143 return offset; 144 145 return sprintf(buf, "%d\n", offset); 146 } 147 148 static ssize_t tcc_offset_degree_celsius_store(struct device *dev, 149 struct device_attribute *attr, const char *buf, 150 size_t count) 151 { 152 unsigned int tcc; 153 u64 val; 154 int err; 155 156 err = rdmsrl_safe(MSR_PLATFORM_INFO, &val); 157 if (err) 158 return err; 159 160 if (!(val & BIT(30))) 161 return -EACCES; 162 163 if (kstrtouint(buf, 0, &tcc)) 164 return -EINVAL; 165 166 err = intel_tcc_set_offset(-1, tcc); 167 if (err) 168 return err; 169 170 return count; 171 } 172 173 static DEVICE_ATTR_RW(tcc_offset_degree_celsius); 174 175 static int proc_thermal_get_zone_temp(struct thermal_zone_device *zone, 176 int *temp) 177 { 178 int cpu; 179 int curr_temp, ret; 180 181 *temp = 0; 182 183 for_each_online_cpu(cpu) { 184 ret = intel_tcc_get_temp(cpu, &curr_temp, false); 185 if (ret < 0) 186 return ret; 187 if (!*temp || curr_temp > *temp) 188 *temp = curr_temp; 189 } 190 191 *temp *= 1000; 192 193 return 0; 194 } 195 196 static int proc_thermal_read_ppcc(struct proc_thermal_device *proc_priv) 197 { 198 int i; 199 acpi_status status; 200 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; 201 union acpi_object *elements, *ppcc; 202 union acpi_object *p; 203 int ret = 0; 204 205 status = acpi_evaluate_object(proc_priv->adev->handle, "PPCC", 206 NULL, &buf); 207 if (ACPI_FAILURE(status)) 208 return -ENODEV; 209 210 p = buf.pointer; 211 if (!p || (p->type != ACPI_TYPE_PACKAGE)) { 212 dev_err(proc_priv->dev, "Invalid PPCC data\n"); 213 ret = -EFAULT; 214 goto free_buffer; 215 } 216 217 if (!p->package.count) { 218 dev_err(proc_priv->dev, "Invalid PPCC package size\n"); 219 ret = -EFAULT; 220 goto free_buffer; 221 } 222 223 for (i = 0; i < min((int)p->package.count - 1, 2); ++i) { 224 elements = &(p->package.elements[i+1]); 225 if (elements->type != ACPI_TYPE_PACKAGE || 226 elements->package.count != 6) { 227 ret = -EFAULT; 228 goto free_buffer; 229 } 230 ppcc = elements->package.elements; 231 proc_priv->power_limits[i].index = ppcc[0].integer.value; 232 proc_priv->power_limits[i].min_uw = ppcc[1].integer.value; 233 proc_priv->power_limits[i].max_uw = ppcc[2].integer.value; 234 proc_priv->power_limits[i].tmin_us = ppcc[3].integer.value; 235 proc_priv->power_limits[i].tmax_us = ppcc[4].integer.value; 236 proc_priv->power_limits[i].step_uw = ppcc[5].integer.value; 237 } 238 239 free_buffer: 240 kfree(buf.pointer); 241 242 return ret; 243 } 244 245 #define PROC_POWER_CAPABILITY_CHANGED 0x83 246 static void proc_thermal_notify(acpi_handle handle, u32 event, void *data) 247 { 248 struct proc_thermal_device *proc_priv = data; 249 250 if (!proc_priv) 251 return; 252 253 switch (event) { 254 case PROC_POWER_CAPABILITY_CHANGED: 255 proc_thermal_read_ppcc(proc_priv); 256 int340x_thermal_zone_device_update(proc_priv->int340x_zone, 257 THERMAL_DEVICE_POWER_CAPABILITY_CHANGED); 258 break; 259 default: 260 dev_dbg(proc_priv->dev, "Unsupported event [0x%x]\n", event); 261 break; 262 } 263 } 264 265 int proc_thermal_add(struct device *dev, struct proc_thermal_device *proc_priv) 266 { 267 struct acpi_device *adev; 268 acpi_status status; 269 unsigned long long tmp; 270 int (*get_temp) (struct thermal_zone_device *, int *) = NULL; 271 int ret; 272 273 adev = ACPI_COMPANION(dev); 274 if (!adev) 275 return -ENODEV; 276 277 proc_priv->dev = dev; 278 proc_priv->adev = adev; 279 280 ret = proc_thermal_read_ppcc(proc_priv); 281 if (ret) 282 return ret; 283 284 status = acpi_evaluate_integer(adev->handle, "_TMP", NULL, &tmp); 285 if (ACPI_FAILURE(status)) { 286 /* there is no _TMP method, add local method */ 287 if (intel_tcc_get_tjmax(-1) > 0) 288 get_temp = proc_thermal_get_zone_temp; 289 } 290 291 proc_priv->int340x_zone = int340x_thermal_zone_add(adev, get_temp); 292 if (IS_ERR(proc_priv->int340x_zone)) { 293 return PTR_ERR(proc_priv->int340x_zone); 294 } else 295 ret = 0; 296 297 ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 298 proc_thermal_notify, 299 (void *)proc_priv); 300 if (ret) 301 goto remove_zone; 302 303 ret = sysfs_create_file(&dev->kobj, &dev_attr_tcc_offset_degree_celsius.attr); 304 if (ret) 305 goto remove_notify; 306 307 ret = sysfs_create_group(&dev->kobj, &power_limit_attribute_group); 308 if (ret) { 309 sysfs_remove_file(&dev->kobj, &dev_attr_tcc_offset_degree_celsius.attr); 310 goto remove_notify; 311 } 312 313 return 0; 314 315 remove_notify: 316 acpi_remove_notify_handler(adev->handle, 317 ACPI_DEVICE_NOTIFY, proc_thermal_notify); 318 remove_zone: 319 int340x_thermal_zone_remove(proc_priv->int340x_zone); 320 321 return ret; 322 } 323 EXPORT_SYMBOL_GPL(proc_thermal_add); 324 325 void proc_thermal_remove(struct proc_thermal_device *proc_priv) 326 { 327 acpi_remove_notify_handler(proc_priv->adev->handle, 328 ACPI_DEVICE_NOTIFY, proc_thermal_notify); 329 int340x_thermal_zone_remove(proc_priv->int340x_zone); 330 sysfs_remove_file(&proc_priv->dev->kobj, &dev_attr_tcc_offset_degree_celsius.attr); 331 sysfs_remove_group(&proc_priv->dev->kobj, 332 &power_limit_attribute_group); 333 } 334 EXPORT_SYMBOL_GPL(proc_thermal_remove); 335 336 static int tcc_offset_save = -1; 337 338 int proc_thermal_suspend(struct device *dev) 339 { 340 tcc_offset_save = intel_tcc_get_offset(-1); 341 if (tcc_offset_save < 0) 342 dev_warn(dev, "failed to save offset (%d)\n", tcc_offset_save); 343 344 return 0; 345 } 346 EXPORT_SYMBOL_GPL(proc_thermal_suspend); 347 348 int proc_thermal_resume(struct device *dev) 349 { 350 struct proc_thermal_device *proc_dev; 351 352 proc_dev = dev_get_drvdata(dev); 353 proc_thermal_read_ppcc(proc_dev); 354 355 /* Do not update if saving failed */ 356 if (tcc_offset_save >= 0) 357 intel_tcc_set_offset(-1, tcc_offset_save); 358 359 return 0; 360 } 361 EXPORT_SYMBOL_GPL(proc_thermal_resume); 362 363 #define MCHBAR 0 364 365 static int proc_thermal_set_mmio_base(struct pci_dev *pdev, struct proc_thermal_device *proc_priv) 366 { 367 int ret; 368 369 ret = pcim_iomap_regions(pdev, 1 << MCHBAR, DRV_NAME); 370 if (ret) { 371 dev_err(&pdev->dev, "cannot reserve PCI memory region\n"); 372 return -ENOMEM; 373 } 374 375 proc_priv->mmio_base = pcim_iomap_table(pdev)[MCHBAR]; 376 377 return 0; 378 } 379 380 int proc_thermal_mmio_add(struct pci_dev *pdev, 381 struct proc_thermal_device *proc_priv, 382 kernel_ulong_t feature_mask) 383 { 384 int ret; 385 386 proc_priv->mmio_feature_mask = feature_mask; 387 388 if (feature_mask) { 389 ret = proc_thermal_set_mmio_base(pdev, proc_priv); 390 if (ret) 391 return ret; 392 } 393 394 if (feature_mask & PROC_THERMAL_FEATURE_RAPL) { 395 ret = proc_thermal_rapl_add(pdev, proc_priv); 396 if (ret) { 397 dev_err(&pdev->dev, "failed to add RAPL MMIO interface\n"); 398 return ret; 399 } 400 } 401 402 if (feature_mask & PROC_THERMAL_FEATURE_FIVR || 403 feature_mask & PROC_THERMAL_FEATURE_DVFS || 404 feature_mask & PROC_THERMAL_FEATURE_DLVR) { 405 ret = proc_thermal_rfim_add(pdev, proc_priv); 406 if (ret) { 407 dev_err(&pdev->dev, "failed to add RFIM interface\n"); 408 goto err_rem_rapl; 409 } 410 } 411 412 if (feature_mask & PROC_THERMAL_FEATURE_WT_REQ) { 413 ret = proc_thermal_wt_req_add(pdev, proc_priv); 414 if (ret) { 415 dev_err(&pdev->dev, "failed to add MBOX interface\n"); 416 goto err_rem_rfim; 417 } 418 } else if (feature_mask & PROC_THERMAL_FEATURE_WT_HINT) { 419 ret = proc_thermal_wt_hint_add(pdev, proc_priv); 420 if (ret) { 421 dev_err(&pdev->dev, "failed to add WT Hint\n"); 422 goto err_rem_rfim; 423 } 424 } 425 426 return 0; 427 428 err_rem_rfim: 429 proc_thermal_rfim_remove(pdev); 430 err_rem_rapl: 431 proc_thermal_rapl_remove(); 432 433 return ret; 434 } 435 EXPORT_SYMBOL_GPL(proc_thermal_mmio_add); 436 437 void proc_thermal_mmio_remove(struct pci_dev *pdev, struct proc_thermal_device *proc_priv) 438 { 439 if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_RAPL) 440 proc_thermal_rapl_remove(); 441 442 if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_FIVR || 443 proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_DVFS || 444 proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_DLVR) 445 proc_thermal_rfim_remove(pdev); 446 447 if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_POWER_FLOOR) 448 proc_thermal_power_floor_set_state(proc_priv, false); 449 450 if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_WT_REQ) 451 proc_thermal_wt_req_remove(pdev); 452 else if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_WT_HINT) 453 proc_thermal_wt_hint_remove(pdev); 454 } 455 EXPORT_SYMBOL_GPL(proc_thermal_mmio_remove); 456 457 MODULE_IMPORT_NS(INTEL_TCC); 458 MODULE_IMPORT_NS(INT340X_THERMAL); 459 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 460 MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver"); 461 MODULE_LICENSE("GPL v2"); 462