1 /* 2 * k10temp.c - AMD Family 10h/11h/12h/14h/15h/16h processor hardware monitoring 3 * 4 * Copyright (c) 2009 Clemens Ladisch <clemens@ladisch.de> 5 * 6 * 7 * This driver is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This driver is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 14 * See the GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this driver; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include <linux/err.h> 21 #include <linux/hwmon.h> 22 #include <linux/hwmon-sysfs.h> 23 #include <linux/init.h> 24 #include <linux/module.h> 25 #include <linux/pci.h> 26 #include <asm/processor.h> 27 28 MODULE_DESCRIPTION("AMD Family 10h+ CPU core temperature monitor"); 29 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>"); 30 MODULE_LICENSE("GPL"); 31 32 static bool force; 33 module_param(force, bool, 0444); 34 MODULE_PARM_DESC(force, "force loading on processors with erratum 319"); 35 36 /* Provide lock for writing to NB_SMU_IND_ADDR */ 37 static DEFINE_MUTEX(nb_smu_ind_mutex); 38 39 #ifndef PCI_DEVICE_ID_AMD_17H_DF_F3 40 #define PCI_DEVICE_ID_AMD_17H_DF_F3 0x1463 41 #endif 42 43 /* CPUID function 0x80000001, ebx */ 44 #define CPUID_PKGTYPE_MASK 0xf0000000 45 #define CPUID_PKGTYPE_F 0x00000000 46 #define CPUID_PKGTYPE_AM2R2_AM3 0x10000000 47 48 /* DRAM controller (PCI function 2) */ 49 #define REG_DCT0_CONFIG_HIGH 0x094 50 #define DDR3_MODE 0x00000100 51 52 /* miscellaneous (PCI function 3) */ 53 #define REG_HARDWARE_THERMAL_CONTROL 0x64 54 #define HTC_ENABLE 0x00000001 55 56 #define REG_REPORTED_TEMPERATURE 0xa4 57 58 #define REG_NORTHBRIDGE_CAPABILITIES 0xe8 59 #define NB_CAP_HTC 0x00000400 60 61 /* 62 * For F15h M60h, functionality of REG_REPORTED_TEMPERATURE 63 * has been moved to D0F0xBC_xD820_0CA4 [Reported Temperature 64 * Control] 65 */ 66 #define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET 0xd8200ca4 67 68 /* F17h M01h Access througn SMN */ 69 #define F17H_M01H_REPORTED_TEMP_CTRL_OFFSET 0x00059800 70 71 struct k10temp_data { 72 struct pci_dev *pdev; 73 void (*read_tempreg)(struct pci_dev *pdev, u32 *regval); 74 int temp_offset; 75 }; 76 77 struct tctl_offset { 78 u8 model; 79 char const *id; 80 int offset; 81 }; 82 83 static const struct tctl_offset tctl_offset_table[] = { 84 { 0x17, "AMD Ryzen 5 1600X", 20000 }, 85 { 0x17, "AMD Ryzen 7 1700X", 20000 }, 86 { 0x17, "AMD Ryzen 7 1800X", 20000 }, 87 { 0x17, "AMD Ryzen Threadripper 1950X", 27000 }, 88 { 0x17, "AMD Ryzen Threadripper 1920X", 27000 }, 89 { 0x17, "AMD Ryzen Threadripper 1900X", 27000 }, 90 { 0x17, "AMD Ryzen Threadripper 1950", 10000 }, 91 { 0x17, "AMD Ryzen Threadripper 1920", 10000 }, 92 { 0x17, "AMD Ryzen Threadripper 1910", 10000 }, 93 }; 94 95 static void read_tempreg_pci(struct pci_dev *pdev, u32 *regval) 96 { 97 pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval); 98 } 99 100 static void amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn, 101 unsigned int base, int offset, u32 *val) 102 { 103 mutex_lock(&nb_smu_ind_mutex); 104 pci_bus_write_config_dword(pdev->bus, devfn, 105 base, offset); 106 pci_bus_read_config_dword(pdev->bus, devfn, 107 base + 4, val); 108 mutex_unlock(&nb_smu_ind_mutex); 109 } 110 111 static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval) 112 { 113 amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8, 114 F15H_M60H_REPORTED_TEMP_CTRL_OFFSET, regval); 115 } 116 117 static void read_tempreg_nb_f17(struct pci_dev *pdev, u32 *regval) 118 { 119 amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0x60, 120 F17H_M01H_REPORTED_TEMP_CTRL_OFFSET, regval); 121 } 122 123 static ssize_t temp1_input_show(struct device *dev, 124 struct device_attribute *attr, char *buf) 125 { 126 struct k10temp_data *data = dev_get_drvdata(dev); 127 u32 regval; 128 unsigned int temp; 129 130 data->read_tempreg(data->pdev, ®val); 131 temp = (regval >> 21) * 125; 132 if (temp > data->temp_offset) 133 temp -= data->temp_offset; 134 else 135 temp = 0; 136 137 return sprintf(buf, "%u\n", temp); 138 } 139 140 static ssize_t temp1_max_show(struct device *dev, 141 struct device_attribute *attr, char *buf) 142 { 143 return sprintf(buf, "%d\n", 70 * 1000); 144 } 145 146 static ssize_t show_temp_crit(struct device *dev, 147 struct device_attribute *devattr, char *buf) 148 { 149 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 150 struct k10temp_data *data = dev_get_drvdata(dev); 151 int show_hyst = attr->index; 152 u32 regval; 153 int value; 154 155 pci_read_config_dword(data->pdev, 156 REG_HARDWARE_THERMAL_CONTROL, ®val); 157 value = ((regval >> 16) & 0x7f) * 500 + 52000; 158 if (show_hyst) 159 value -= ((regval >> 24) & 0xf) * 500; 160 return sprintf(buf, "%d\n", value); 161 } 162 163 static DEVICE_ATTR_RO(temp1_input); 164 static DEVICE_ATTR_RO(temp1_max); 165 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0); 166 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1); 167 168 static umode_t k10temp_is_visible(struct kobject *kobj, 169 struct attribute *attr, int index) 170 { 171 struct device *dev = container_of(kobj, struct device, kobj); 172 struct k10temp_data *data = dev_get_drvdata(dev); 173 struct pci_dev *pdev = data->pdev; 174 175 if (index >= 2) { 176 u32 reg_caps, reg_htc; 177 178 pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, 179 ®_caps); 180 pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, 181 ®_htc); 182 if (!(reg_caps & NB_CAP_HTC) || !(reg_htc & HTC_ENABLE)) 183 return 0; 184 } 185 return attr->mode; 186 } 187 188 static struct attribute *k10temp_attrs[] = { 189 &dev_attr_temp1_input.attr, 190 &dev_attr_temp1_max.attr, 191 &sensor_dev_attr_temp1_crit.dev_attr.attr, 192 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, 193 NULL 194 }; 195 196 static const struct attribute_group k10temp_group = { 197 .attrs = k10temp_attrs, 198 .is_visible = k10temp_is_visible, 199 }; 200 __ATTRIBUTE_GROUPS(k10temp); 201 202 static bool has_erratum_319(struct pci_dev *pdev) 203 { 204 u32 pkg_type, reg_dram_cfg; 205 206 if (boot_cpu_data.x86 != 0x10) 207 return false; 208 209 /* 210 * Erratum 319: The thermal sensor of Socket F/AM2+ processors 211 * may be unreliable. 212 */ 213 pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK; 214 if (pkg_type == CPUID_PKGTYPE_F) 215 return true; 216 if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3) 217 return false; 218 219 /* DDR3 memory implies socket AM3, which is good */ 220 pci_bus_read_config_dword(pdev->bus, 221 PCI_DEVFN(PCI_SLOT(pdev->devfn), 2), 222 REG_DCT0_CONFIG_HIGH, ®_dram_cfg); 223 if (reg_dram_cfg & DDR3_MODE) 224 return false; 225 226 /* 227 * Unfortunately it is possible to run a socket AM3 CPU with DDR2 228 * memory. We blacklist all the cores which do exist in socket AM2+ 229 * format. It still isn't perfect, as RB-C2 cores exist in both AM2+ 230 * and AM3 formats, but that's the best we can do. 231 */ 232 return boot_cpu_data.x86_model < 4 || 233 (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_stepping <= 2); 234 } 235 236 static int k10temp_probe(struct pci_dev *pdev, 237 const struct pci_device_id *id) 238 { 239 int unreliable = has_erratum_319(pdev); 240 struct device *dev = &pdev->dev; 241 struct k10temp_data *data; 242 struct device *hwmon_dev; 243 int i; 244 245 if (unreliable) { 246 if (!force) { 247 dev_err(dev, 248 "unreliable CPU thermal sensor; monitoring disabled\n"); 249 return -ENODEV; 250 } 251 dev_warn(dev, 252 "unreliable CPU thermal sensor; check erratum 319\n"); 253 } 254 255 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 256 if (!data) 257 return -ENOMEM; 258 259 data->pdev = pdev; 260 261 if (boot_cpu_data.x86 == 0x15 && (boot_cpu_data.x86_model == 0x60 || 262 boot_cpu_data.x86_model == 0x70)) 263 data->read_tempreg = read_tempreg_nb_f15; 264 else if (boot_cpu_data.x86 == 0x17) 265 data->read_tempreg = read_tempreg_nb_f17; 266 else 267 data->read_tempreg = read_tempreg_pci; 268 269 for (i = 0; i < ARRAY_SIZE(tctl_offset_table); i++) { 270 const struct tctl_offset *entry = &tctl_offset_table[i]; 271 272 if (boot_cpu_data.x86 == entry->model && 273 strstr(boot_cpu_data.x86_model_id, entry->id)) { 274 data->temp_offset = entry->offset; 275 break; 276 } 277 } 278 279 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "k10temp", data, 280 k10temp_groups); 281 return PTR_ERR_OR_ZERO(hwmon_dev); 282 } 283 284 static const struct pci_device_id k10temp_id_table[] = { 285 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) }, 286 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) }, 287 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) }, 288 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) }, 289 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) }, 290 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) }, 291 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) }, 292 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) }, 293 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) }, 294 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_17H_DF_F3) }, 295 {} 296 }; 297 MODULE_DEVICE_TABLE(pci, k10temp_id_table); 298 299 static struct pci_driver k10temp_driver = { 300 .name = "k10temp", 301 .id_table = k10temp_id_table, 302 .probe = k10temp_probe, 303 }; 304 305 module_pci_driver(k10temp_driver); 306