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 /* CPUID function 0x80000001, ebx */ 37 #define CPUID_PKGTYPE_MASK 0xf0000000 38 #define CPUID_PKGTYPE_F 0x00000000 39 #define CPUID_PKGTYPE_AM2R2_AM3 0x10000000 40 41 /* DRAM controller (PCI function 2) */ 42 #define REG_DCT0_CONFIG_HIGH 0x094 43 #define DDR3_MODE 0x00000100 44 45 /* miscellaneous (PCI function 3) */ 46 #define REG_HARDWARE_THERMAL_CONTROL 0x64 47 #define HTC_ENABLE 0x00000001 48 49 #define REG_REPORTED_TEMPERATURE 0xa4 50 51 #define REG_NORTHBRIDGE_CAPABILITIES 0xe8 52 #define NB_CAP_HTC 0x00000400 53 54 static ssize_t show_temp(struct device *dev, 55 struct device_attribute *attr, char *buf) 56 { 57 u32 regval; 58 59 pci_read_config_dword(to_pci_dev(dev), 60 REG_REPORTED_TEMPERATURE, ®val); 61 return sprintf(buf, "%u\n", (regval >> 21) * 125); 62 } 63 64 static ssize_t show_temp_max(struct device *dev, 65 struct device_attribute *attr, char *buf) 66 { 67 return sprintf(buf, "%d\n", 70 * 1000); 68 } 69 70 static ssize_t show_temp_crit(struct device *dev, 71 struct device_attribute *devattr, char *buf) 72 { 73 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 74 int show_hyst = attr->index; 75 u32 regval; 76 int value; 77 78 pci_read_config_dword(to_pci_dev(dev), 79 REG_HARDWARE_THERMAL_CONTROL, ®val); 80 value = ((regval >> 16) & 0x7f) * 500 + 52000; 81 if (show_hyst) 82 value -= ((regval >> 24) & 0xf) * 500; 83 return sprintf(buf, "%d\n", value); 84 } 85 86 static ssize_t show_name(struct device *dev, 87 struct device_attribute *attr, char *buf) 88 { 89 return sprintf(buf, "k10temp\n"); 90 } 91 92 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); 93 static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL); 94 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0); 95 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1); 96 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 97 98 static bool has_erratum_319(struct pci_dev *pdev) 99 { 100 u32 pkg_type, reg_dram_cfg; 101 102 if (boot_cpu_data.x86 != 0x10) 103 return false; 104 105 /* 106 * Erratum 319: The thermal sensor of Socket F/AM2+ processors 107 * may be unreliable. 108 */ 109 pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK; 110 if (pkg_type == CPUID_PKGTYPE_F) 111 return true; 112 if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3) 113 return false; 114 115 /* DDR3 memory implies socket AM3, which is good */ 116 pci_bus_read_config_dword(pdev->bus, 117 PCI_DEVFN(PCI_SLOT(pdev->devfn), 2), 118 REG_DCT0_CONFIG_HIGH, ®_dram_cfg); 119 if (reg_dram_cfg & DDR3_MODE) 120 return false; 121 122 /* 123 * Unfortunately it is possible to run a socket AM3 CPU with DDR2 124 * memory. We blacklist all the cores which do exist in socket AM2+ 125 * format. It still isn't perfect, as RB-C2 cores exist in both AM2+ 126 * and AM3 formats, but that's the best we can do. 127 */ 128 return boot_cpu_data.x86_model < 4 || 129 (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2); 130 } 131 132 static int k10temp_probe(struct pci_dev *pdev, 133 const struct pci_device_id *id) 134 { 135 struct device *hwmon_dev; 136 u32 reg_caps, reg_htc; 137 int unreliable = has_erratum_319(pdev); 138 int err; 139 140 if (unreliable && !force) { 141 dev_err(&pdev->dev, 142 "unreliable CPU thermal sensor; monitoring disabled\n"); 143 err = -ENODEV; 144 goto exit; 145 } 146 147 err = device_create_file(&pdev->dev, &dev_attr_temp1_input); 148 if (err) 149 goto exit; 150 err = device_create_file(&pdev->dev, &dev_attr_temp1_max); 151 if (err) 152 goto exit_remove; 153 154 pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, ®_caps); 155 pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, ®_htc); 156 if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) { 157 err = device_create_file(&pdev->dev, 158 &sensor_dev_attr_temp1_crit.dev_attr); 159 if (err) 160 goto exit_remove; 161 err = device_create_file(&pdev->dev, 162 &sensor_dev_attr_temp1_crit_hyst.dev_attr); 163 if (err) 164 goto exit_remove; 165 } 166 167 err = device_create_file(&pdev->dev, &dev_attr_name); 168 if (err) 169 goto exit_remove; 170 171 hwmon_dev = hwmon_device_register(&pdev->dev); 172 if (IS_ERR(hwmon_dev)) { 173 err = PTR_ERR(hwmon_dev); 174 goto exit_remove; 175 } 176 pci_set_drvdata(pdev, hwmon_dev); 177 178 if (unreliable && force) 179 dev_warn(&pdev->dev, 180 "unreliable CPU thermal sensor; check erratum 319\n"); 181 return 0; 182 183 exit_remove: 184 device_remove_file(&pdev->dev, &dev_attr_name); 185 device_remove_file(&pdev->dev, &dev_attr_temp1_input); 186 device_remove_file(&pdev->dev, &dev_attr_temp1_max); 187 device_remove_file(&pdev->dev, 188 &sensor_dev_attr_temp1_crit.dev_attr); 189 device_remove_file(&pdev->dev, 190 &sensor_dev_attr_temp1_crit_hyst.dev_attr); 191 exit: 192 return err; 193 } 194 195 static void k10temp_remove(struct pci_dev *pdev) 196 { 197 hwmon_device_unregister(pci_get_drvdata(pdev)); 198 device_remove_file(&pdev->dev, &dev_attr_name); 199 device_remove_file(&pdev->dev, &dev_attr_temp1_input); 200 device_remove_file(&pdev->dev, &dev_attr_temp1_max); 201 device_remove_file(&pdev->dev, 202 &sensor_dev_attr_temp1_crit.dev_attr); 203 device_remove_file(&pdev->dev, 204 &sensor_dev_attr_temp1_crit_hyst.dev_attr); 205 } 206 207 static DEFINE_PCI_DEVICE_TABLE(k10temp_id_table) = { 208 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) }, 209 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) }, 210 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) }, 211 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) }, 212 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) }, 213 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) }, 214 {} 215 }; 216 MODULE_DEVICE_TABLE(pci, k10temp_id_table); 217 218 static struct pci_driver k10temp_driver = { 219 .name = "k10temp", 220 .id_table = k10temp_id_table, 221 .probe = k10temp_probe, 222 .remove = k10temp_remove, 223 }; 224 225 module_pci_driver(k10temp_driver); 226