drivers/thermal/intel/int340x_thermal/processor_thermal_device.c

   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");