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 POWER_LIMIT_SHOW(0, min_uw) 30 POWER_LIMIT_SHOW(0, max_uw) 31 POWER_LIMIT_SHOW(0, step_uw) 32 POWER_LIMIT_SHOW(0, tmin_us) 33 POWER_LIMIT_SHOW(0, tmax_us) 34 35 POWER_LIMIT_SHOW(1, min_uw) 36 POWER_LIMIT_SHOW(1, max_uw) 37 POWER_LIMIT_SHOW(1, step_uw) 38 POWER_LIMIT_SHOW(1, tmin_us) 39 POWER_LIMIT_SHOW(1, tmax_us) 40 41 static DEVICE_ATTR_RO(power_limit_0_min_uw); 42 static DEVICE_ATTR_RO(power_limit_0_max_uw); 43 static DEVICE_ATTR_RO(power_limit_0_step_uw); 44 static DEVICE_ATTR_RO(power_limit_0_tmin_us); 45 static DEVICE_ATTR_RO(power_limit_0_tmax_us); 46 47 static DEVICE_ATTR_RO(power_limit_1_min_uw); 48 static DEVICE_ATTR_RO(power_limit_1_max_uw); 49 static DEVICE_ATTR_RO(power_limit_1_step_uw); 50 static DEVICE_ATTR_RO(power_limit_1_tmin_us); 51 static DEVICE_ATTR_RO(power_limit_1_tmax_us); 52 53 static struct attribute *power_limit_attrs[] = { 54 &dev_attr_power_limit_0_min_uw.attr, 55 &dev_attr_power_limit_1_min_uw.attr, 56 &dev_attr_power_limit_0_max_uw.attr, 57 &dev_attr_power_limit_1_max_uw.attr, 58 &dev_attr_power_limit_0_step_uw.attr, 59 &dev_attr_power_limit_1_step_uw.attr, 60 &dev_attr_power_limit_0_tmin_us.attr, 61 &dev_attr_power_limit_1_tmin_us.attr, 62 &dev_attr_power_limit_0_tmax_us.attr, 63 &dev_attr_power_limit_1_tmax_us.attr, 64 NULL 65 }; 66 67 static const struct attribute_group power_limit_attribute_group = { 68 .attrs = power_limit_attrs, 69 .name = "power_limits" 70 }; 71 72 static ssize_t tcc_offset_degree_celsius_show(struct device *dev, 73 struct device_attribute *attr, 74 char *buf) 75 { 76 int offset; 77 78 offset = intel_tcc_get_offset(-1); 79 if (offset < 0) 80 return offset; 81 82 return sprintf(buf, "%d\n", offset); 83 } 84 85 static ssize_t tcc_offset_degree_celsius_store(struct device *dev, 86 struct device_attribute *attr, const char *buf, 87 size_t count) 88 { 89 unsigned int tcc; 90 u64 val; 91 int err; 92 93 err = rdmsrl_safe(MSR_PLATFORM_INFO, &val); 94 if (err) 95 return err; 96 97 if (!(val & BIT(30))) 98 return -EACCES; 99 100 if (kstrtouint(buf, 0, &tcc)) 101 return -EINVAL; 102 103 err = intel_tcc_set_offset(-1, tcc); 104 if (err) 105 return err; 106 107 return count; 108 } 109 110 static DEVICE_ATTR_RW(tcc_offset_degree_celsius); 111 112 static int proc_thermal_get_zone_temp(struct thermal_zone_device *zone, 113 int *temp) 114 { 115 int cpu; 116 int curr_temp; 117 118 *temp = 0; 119 120 for_each_online_cpu(cpu) { 121 curr_temp = intel_tcc_get_temp(cpu, false); 122 if (curr_temp < 0) 123 return curr_temp; 124 if (!*temp || curr_temp > *temp) 125 *temp = curr_temp; 126 } 127 128 *temp *= 1000; 129 130 return 0; 131 } 132 133 static int proc_thermal_read_ppcc(struct proc_thermal_device *proc_priv) 134 { 135 int i; 136 acpi_status status; 137 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; 138 union acpi_object *elements, *ppcc; 139 union acpi_object *p; 140 int ret = 0; 141 142 status = acpi_evaluate_object(proc_priv->adev->handle, "PPCC", 143 NULL, &buf); 144 if (ACPI_FAILURE(status)) 145 return -ENODEV; 146 147 p = buf.pointer; 148 if (!p || (p->type != ACPI_TYPE_PACKAGE)) { 149 dev_err(proc_priv->dev, "Invalid PPCC data\n"); 150 ret = -EFAULT; 151 goto free_buffer; 152 } 153 154 if (!p->package.count) { 155 dev_err(proc_priv->dev, "Invalid PPCC package size\n"); 156 ret = -EFAULT; 157 goto free_buffer; 158 } 159 160 for (i = 0; i < min((int)p->package.count - 1, 2); ++i) { 161 elements = &(p->package.elements[i+1]); 162 if (elements->type != ACPI_TYPE_PACKAGE || 163 elements->package.count != 6) { 164 ret = -EFAULT; 165 goto free_buffer; 166 } 167 ppcc = elements->package.elements; 168 proc_priv->power_limits[i].index = ppcc[0].integer.value; 169 proc_priv->power_limits[i].min_uw = ppcc[1].integer.value; 170 proc_priv->power_limits[i].max_uw = ppcc[2].integer.value; 171 proc_priv->power_limits[i].tmin_us = ppcc[3].integer.value; 172 proc_priv->power_limits[i].tmax_us = ppcc[4].integer.value; 173 proc_priv->power_limits[i].step_uw = ppcc[5].integer.value; 174 } 175 176 free_buffer: 177 kfree(buf.pointer); 178 179 return ret; 180 } 181 182 #define PROC_POWER_CAPABILITY_CHANGED 0x83 183 static void proc_thermal_notify(acpi_handle handle, u32 event, void *data) 184 { 185 struct proc_thermal_device *proc_priv = data; 186 187 if (!proc_priv) 188 return; 189 190 switch (event) { 191 case PROC_POWER_CAPABILITY_CHANGED: 192 proc_thermal_read_ppcc(proc_priv); 193 int340x_thermal_zone_device_update(proc_priv->int340x_zone, 194 THERMAL_DEVICE_POWER_CAPABILITY_CHANGED); 195 break; 196 default: 197 dev_dbg(proc_priv->dev, "Unsupported event [0x%x]\n", event); 198 break; 199 } 200 } 201 202 int proc_thermal_add(struct device *dev, struct proc_thermal_device *proc_priv) 203 { 204 struct acpi_device *adev; 205 acpi_status status; 206 unsigned long long tmp; 207 int (*get_temp) (struct thermal_zone_device *, int *) = NULL; 208 int ret; 209 210 adev = ACPI_COMPANION(dev); 211 if (!adev) 212 return -ENODEV; 213 214 proc_priv->dev = dev; 215 proc_priv->adev = adev; 216 217 ret = proc_thermal_read_ppcc(proc_priv); 218 if (ret) 219 return ret; 220 221 status = acpi_evaluate_integer(adev->handle, "_TMP", NULL, &tmp); 222 if (ACPI_FAILURE(status)) { 223 /* there is no _TMP method, add local method */ 224 if (intel_tcc_get_tjmax(-1) > 0) 225 get_temp = proc_thermal_get_zone_temp; 226 } 227 228 proc_priv->int340x_zone = int340x_thermal_zone_add(adev, get_temp); 229 if (IS_ERR(proc_priv->int340x_zone)) { 230 return PTR_ERR(proc_priv->int340x_zone); 231 } else 232 ret = 0; 233 234 ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, 235 proc_thermal_notify, 236 (void *)proc_priv); 237 if (ret) 238 goto remove_zone; 239 240 ret = sysfs_create_file(&dev->kobj, &dev_attr_tcc_offset_degree_celsius.attr); 241 if (ret) 242 goto remove_notify; 243 244 ret = sysfs_create_group(&dev->kobj, &power_limit_attribute_group); 245 if (ret) { 246 sysfs_remove_file(&dev->kobj, &dev_attr_tcc_offset_degree_celsius.attr); 247 goto remove_notify; 248 } 249 250 return 0; 251 252 remove_notify: 253 acpi_remove_notify_handler(adev->handle, 254 ACPI_DEVICE_NOTIFY, proc_thermal_notify); 255 remove_zone: 256 int340x_thermal_zone_remove(proc_priv->int340x_zone); 257 258 return ret; 259 } 260 EXPORT_SYMBOL_GPL(proc_thermal_add); 261 262 void proc_thermal_remove(struct proc_thermal_device *proc_priv) 263 { 264 acpi_remove_notify_handler(proc_priv->adev->handle, 265 ACPI_DEVICE_NOTIFY, proc_thermal_notify); 266 int340x_thermal_zone_remove(proc_priv->int340x_zone); 267 sysfs_remove_file(&proc_priv->dev->kobj, &dev_attr_tcc_offset_degree_celsius.attr); 268 sysfs_remove_group(&proc_priv->dev->kobj, 269 &power_limit_attribute_group); 270 } 271 EXPORT_SYMBOL_GPL(proc_thermal_remove); 272 273 static int tcc_offset_save = -1; 274 275 int proc_thermal_suspend(struct device *dev) 276 { 277 tcc_offset_save = intel_tcc_get_offset(-1); 278 if (tcc_offset_save < 0) 279 dev_warn(dev, "failed to save offset (%d)\n", tcc_offset_save); 280 281 return 0; 282 } 283 EXPORT_SYMBOL_GPL(proc_thermal_suspend); 284 285 int proc_thermal_resume(struct device *dev) 286 { 287 struct proc_thermal_device *proc_dev; 288 289 proc_dev = dev_get_drvdata(dev); 290 proc_thermal_read_ppcc(proc_dev); 291 292 /* Do not update if saving failed */ 293 if (tcc_offset_save >= 0) 294 intel_tcc_set_offset(-1, tcc_offset_save); 295 296 return 0; 297 } 298 EXPORT_SYMBOL_GPL(proc_thermal_resume); 299 300 #define MCHBAR 0 301 302 static int proc_thermal_set_mmio_base(struct pci_dev *pdev, struct proc_thermal_device *proc_priv) 303 { 304 int ret; 305 306 ret = pcim_iomap_regions(pdev, 1 << MCHBAR, DRV_NAME); 307 if (ret) { 308 dev_err(&pdev->dev, "cannot reserve PCI memory region\n"); 309 return -ENOMEM; 310 } 311 312 proc_priv->mmio_base = pcim_iomap_table(pdev)[MCHBAR]; 313 314 return 0; 315 } 316 317 int proc_thermal_mmio_add(struct pci_dev *pdev, 318 struct proc_thermal_device *proc_priv, 319 kernel_ulong_t feature_mask) 320 { 321 int ret; 322 323 proc_priv->mmio_feature_mask = feature_mask; 324 325 if (feature_mask) { 326 ret = proc_thermal_set_mmio_base(pdev, proc_priv); 327 if (ret) 328 return ret; 329 } 330 331 if (feature_mask & PROC_THERMAL_FEATURE_RAPL) { 332 ret = proc_thermal_rapl_add(pdev, proc_priv); 333 if (ret) { 334 dev_err(&pdev->dev, "failed to add RAPL MMIO interface\n"); 335 return ret; 336 } 337 } 338 339 if (feature_mask & PROC_THERMAL_FEATURE_FIVR || 340 feature_mask & PROC_THERMAL_FEATURE_DVFS || 341 feature_mask & PROC_THERMAL_FEATURE_DLVR) { 342 ret = proc_thermal_rfim_add(pdev, proc_priv); 343 if (ret) { 344 dev_err(&pdev->dev, "failed to add RFIM interface\n"); 345 goto err_rem_rapl; 346 } 347 } 348 349 if (feature_mask & PROC_THERMAL_FEATURE_MBOX) { 350 ret = proc_thermal_mbox_add(pdev, proc_priv); 351 if (ret) { 352 dev_err(&pdev->dev, "failed to add MBOX interface\n"); 353 goto err_rem_rfim; 354 } 355 } 356 357 return 0; 358 359 err_rem_rfim: 360 proc_thermal_rfim_remove(pdev); 361 err_rem_rapl: 362 proc_thermal_rapl_remove(); 363 364 return ret; 365 } 366 EXPORT_SYMBOL_GPL(proc_thermal_mmio_add); 367 368 void proc_thermal_mmio_remove(struct pci_dev *pdev, struct proc_thermal_device *proc_priv) 369 { 370 if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_RAPL) 371 proc_thermal_rapl_remove(); 372 373 if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_FIVR || 374 proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_DVFS) 375 proc_thermal_rfim_remove(pdev); 376 377 if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_MBOX) 378 proc_thermal_mbox_remove(pdev); 379 } 380 EXPORT_SYMBOL_GPL(proc_thermal_mmio_remove); 381 382 MODULE_IMPORT_NS(INTEL_TCC); 383 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 384 MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver"); 385 MODULE_LICENSE("GPL v2"); 386