Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 1 | /* |
| 2 | * coretemp.c - Linux kernel module for hardware monitoring |
| 3 | * |
| 4 | * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> |
| 5 | * |
| 6 | * Inspired from many hwmon drivers |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; version 2 of the License. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 20 | * 02110-1301 USA. |
| 21 | */ |
| 22 | |
Joe Perches | f8bb892 | 2010-10-20 06:51:31 +0000 | [diff] [blame] | 23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 24 | |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 25 | #include <linux/module.h> |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 26 | #include <linux/init.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/jiffies.h> |
| 29 | #include <linux/hwmon.h> |
| 30 | #include <linux/sysfs.h> |
| 31 | #include <linux/hwmon-sysfs.h> |
| 32 | #include <linux/err.h> |
| 33 | #include <linux/mutex.h> |
| 34 | #include <linux/list.h> |
| 35 | #include <linux/platform_device.h> |
| 36 | #include <linux/cpu.h> |
Yong Wang | 1fe63ab | 2010-01-10 20:52:34 +0100 | [diff] [blame] | 37 | #include <linux/pci.h> |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 38 | #include <linux/smp.h> |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 39 | #include <asm/msr.h> |
| 40 | #include <asm/processor.h> |
| 41 | |
| 42 | #define DRVNAME "coretemp" |
| 43 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 44 | #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */ |
| 45 | #define NUM_REAL_CORES 16 /* Number of Real cores per cpu */ |
| 46 | #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */ |
| 47 | #define MAX_ATTRS 5 /* Maximum no of per-core attrs */ |
| 48 | #define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO) |
| 49 | |
| 50 | #ifdef CONFIG_SMP |
| 51 | #define TO_PHYS_ID(cpu) cpu_data(cpu).phys_proc_id |
| 52 | #define TO_CORE_ID(cpu) cpu_data(cpu).cpu_core_id |
| 53 | #define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO) |
Guenter Roeck | bb74e8c | 2011-05-23 12:06:41 -0700 | [diff] [blame] | 54 | #define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu)) |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 55 | #else |
| 56 | #define TO_PHYS_ID(cpu) (cpu) |
| 57 | #define TO_CORE_ID(cpu) (cpu) |
| 58 | #define TO_ATTR_NO(cpu) (cpu) |
Guenter Roeck | bb74e8c | 2011-05-23 12:06:41 -0700 | [diff] [blame] | 59 | #define for_each_sibling(i, cpu) for (i = 0; false; ) |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 60 | #endif |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 61 | |
| 62 | /* |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 63 | * Per-Core Temperature Data |
| 64 | * @last_updated: The time when the current temperature value was updated |
| 65 | * earlier (in jiffies). |
| 66 | * @cpu_core_id: The CPU Core from which temperature values should be read |
| 67 | * This value is passed as "id" field to rdmsr/wrmsr functions. |
| 68 | * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS, |
| 69 | * from where the temperature values should be read. |
| 70 | * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data. |
| 71 | * Otherwise, temp_data holds coretemp data. |
| 72 | * @valid: If this is 1, the current temperature is valid. |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 73 | */ |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 74 | struct temp_data { |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 75 | int temp; |
Rudolf Marek | 6369a288 | 2008-01-18 00:42:54 +0100 | [diff] [blame] | 76 | int ttarget; |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 77 | int tjmax; |
| 78 | unsigned long last_updated; |
| 79 | unsigned int cpu; |
| 80 | u32 cpu_core_id; |
| 81 | u32 status_reg; |
| 82 | bool is_pkg_data; |
| 83 | bool valid; |
| 84 | struct sensor_device_attribute sd_attrs[MAX_ATTRS]; |
| 85 | char attr_name[MAX_ATTRS][CORETEMP_NAME_LENGTH]; |
| 86 | struct mutex update_lock; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 87 | }; |
| 88 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 89 | /* Platform Data per Physical CPU */ |
| 90 | struct platform_data { |
| 91 | struct device *hwmon_dev; |
| 92 | u16 phys_proc_id; |
| 93 | struct temp_data *core_data[MAX_CORE_DATA]; |
| 94 | struct device_attribute name_attr; |
| 95 | }; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 96 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 97 | struct pdev_entry { |
| 98 | struct list_head list; |
| 99 | struct platform_device *pdev; |
| 100 | unsigned int cpu; |
| 101 | u16 phys_proc_id; |
| 102 | u16 cpu_core_id; |
| 103 | }; |
| 104 | |
| 105 | static LIST_HEAD(pdev_list); |
| 106 | static DEFINE_MUTEX(pdev_list_mutex); |
| 107 | |
| 108 | static ssize_t show_name(struct device *dev, |
| 109 | struct device_attribute *devattr, char *buf) |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 110 | { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 111 | return sprintf(buf, "%s\n", DRVNAME); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 112 | } |
| 113 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 114 | static ssize_t show_label(struct device *dev, |
| 115 | struct device_attribute *devattr, char *buf) |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 116 | { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 117 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 118 | struct platform_data *pdata = dev_get_drvdata(dev); |
| 119 | struct temp_data *tdata = pdata->core_data[attr->index]; |
| 120 | |
| 121 | if (tdata->is_pkg_data) |
| 122 | return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id); |
| 123 | |
| 124 | return sprintf(buf, "Core %u\n", tdata->cpu_core_id); |
| 125 | } |
| 126 | |
| 127 | static ssize_t show_crit_alarm(struct device *dev, |
| 128 | struct device_attribute *devattr, char *buf) |
| 129 | { |
| 130 | u32 eax, edx; |
| 131 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 132 | struct platform_data *pdata = dev_get_drvdata(dev); |
| 133 | struct temp_data *tdata = pdata->core_data[attr->index]; |
| 134 | |
| 135 | rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx); |
| 136 | |
| 137 | return sprintf(buf, "%d\n", (eax >> 5) & 1); |
| 138 | } |
| 139 | |
| 140 | static ssize_t show_tjmax(struct device *dev, |
| 141 | struct device_attribute *devattr, char *buf) |
| 142 | { |
| 143 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 144 | struct platform_data *pdata = dev_get_drvdata(dev); |
| 145 | |
| 146 | return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax); |
| 147 | } |
| 148 | |
| 149 | static ssize_t show_ttarget(struct device *dev, |
| 150 | struct device_attribute *devattr, char *buf) |
| 151 | { |
| 152 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
| 153 | struct platform_data *pdata = dev_get_drvdata(dev); |
| 154 | |
| 155 | return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | static ssize_t show_temp(struct device *dev, |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 159 | struct device_attribute *devattr, char *buf) |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 160 | { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 161 | u32 eax, edx; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 162 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 163 | struct platform_data *pdata = dev_get_drvdata(dev); |
| 164 | struct temp_data *tdata = pdata->core_data[attr->index]; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 165 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 166 | mutex_lock(&tdata->update_lock); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 167 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 168 | /* Check whether the time interval has elapsed */ |
| 169 | if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) { |
| 170 | rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx); |
| 171 | tdata->valid = 0; |
| 172 | /* Check whether the data is valid */ |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 173 | if (eax & 0x80000000) { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 174 | tdata->temp = tdata->tjmax - |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 175 | ((eax >> 16) & 0x7f) * 1000; |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 176 | tdata->valid = 1; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 177 | } |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 178 | tdata->last_updated = jiffies; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 179 | } |
| 180 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 181 | mutex_unlock(&tdata->update_lock); |
| 182 | return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 183 | } |
| 184 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 185 | static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 186 | { |
| 187 | /* The 100C is default for both mobile and non mobile CPUs */ |
| 188 | |
| 189 | int tjmax = 100000; |
Rudolf Marek | eccfed4 | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 190 | int tjmax_ee = 85000; |
Rudolf Marek | 708a62b | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 191 | int usemsr_ee = 1; |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 192 | int err; |
| 193 | u32 eax, edx; |
Yong Wang | 1fe63ab | 2010-01-10 20:52:34 +0100 | [diff] [blame] | 194 | struct pci_dev *host_bridge; |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 195 | |
| 196 | /* Early chips have no MSR for TjMax */ |
| 197 | |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 198 | if (c->x86_model == 0xf && c->x86_mask < 4) |
Rudolf Marek | 708a62b | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 199 | usemsr_ee = 0; |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 200 | |
Yong Wang | 1fe63ab | 2010-01-10 20:52:34 +0100 | [diff] [blame] | 201 | /* Atom CPUs */ |
Rudolf Marek | 708a62b | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 202 | |
| 203 | if (c->x86_model == 0x1c) { |
| 204 | usemsr_ee = 0; |
Yong Wang | 1fe63ab | 2010-01-10 20:52:34 +0100 | [diff] [blame] | 205 | |
| 206 | host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0)); |
| 207 | |
| 208 | if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL |
| 209 | && (host_bridge->device == 0xa000 /* NM10 based nettop */ |
| 210 | || host_bridge->device == 0xa010)) /* NM10 based netbook */ |
| 211 | tjmax = 100000; |
| 212 | else |
| 213 | tjmax = 90000; |
| 214 | |
| 215 | pci_dev_put(host_bridge); |
Rudolf Marek | 708a62b | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 216 | } |
| 217 | |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 218 | if (c->x86_model > 0xe && usemsr_ee) { |
Rudolf Marek | eccfed4 | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 219 | u8 platform_id; |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 220 | |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 221 | /* |
| 222 | * Now we can detect the mobile CPU using Intel provided table |
| 223 | * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm |
| 224 | * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU |
| 225 | */ |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 226 | err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx); |
| 227 | if (err) { |
| 228 | dev_warn(dev, |
| 229 | "Unable to access MSR 0x17, assuming desktop" |
| 230 | " CPU\n"); |
Rudolf Marek | 708a62b | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 231 | usemsr_ee = 0; |
Rudolf Marek | eccfed4 | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 232 | } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) { |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 233 | /* |
| 234 | * Trust bit 28 up to Penryn, I could not find any |
| 235 | * documentation on that; if you happen to know |
| 236 | * someone at Intel please ask |
| 237 | */ |
Rudolf Marek | 708a62b | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 238 | usemsr_ee = 0; |
Rudolf Marek | eccfed4 | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 239 | } else { |
| 240 | /* Platform ID bits 52:50 (EDX starts at bit 32) */ |
| 241 | platform_id = (edx >> 18) & 0x7; |
| 242 | |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 243 | /* |
| 244 | * Mobile Penryn CPU seems to be platform ID 7 or 5 |
| 245 | * (guesswork) |
| 246 | */ |
| 247 | if (c->x86_model == 0x17 && |
| 248 | (platform_id == 5 || platform_id == 7)) { |
| 249 | /* |
| 250 | * If MSR EE bit is set, set it to 90 degrees C, |
| 251 | * otherwise 105 degrees C |
| 252 | */ |
Rudolf Marek | eccfed4 | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 253 | tjmax_ee = 90000; |
| 254 | tjmax = 105000; |
| 255 | } |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 256 | } |
| 257 | } |
| 258 | |
Rudolf Marek | 708a62b | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 259 | if (usemsr_ee) { |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 260 | err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx); |
| 261 | if (err) { |
| 262 | dev_warn(dev, |
| 263 | "Unable to access MSR 0xEE, for Tjmax, left" |
Dean Nelson | 4d7a564 | 2010-03-29 22:03:00 +0200 | [diff] [blame] | 264 | " at default\n"); |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 265 | } else if (eax & 0x40000000) { |
Rudolf Marek | eccfed4 | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 266 | tjmax = tjmax_ee; |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 267 | } |
Rudolf Marek | 708a62b | 2009-09-23 22:59:42 +0200 | [diff] [blame] | 268 | } else if (tjmax == 100000) { |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 269 | /* |
| 270 | * If we don't use msr EE it means we are desktop CPU |
| 271 | * (with exeception of Atom) |
| 272 | */ |
Rudolf Marek | 118a887 | 2008-02-17 22:59:39 +0100 | [diff] [blame] | 273 | dev_warn(dev, "Using relative temperature scale!\n"); |
| 274 | } |
| 275 | |
| 276 | return tjmax; |
| 277 | } |
| 278 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 279 | static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) |
Carsten Emde | a321ced | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 280 | { |
| 281 | /* The 100C is default for both mobile and non mobile CPUs */ |
| 282 | int err; |
| 283 | u32 eax, edx; |
| 284 | u32 val; |
| 285 | |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 286 | /* |
| 287 | * A new feature of current Intel(R) processors, the |
| 288 | * IA32_TEMPERATURE_TARGET contains the TjMax value |
| 289 | */ |
Carsten Emde | a321ced | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 290 | err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); |
| 291 | if (err) { |
| 292 | dev_warn(dev, "Unable to read TjMax from CPU.\n"); |
| 293 | } else { |
| 294 | val = (eax >> 16) & 0xff; |
| 295 | /* |
| 296 | * If the TjMax is not plausible, an assumption |
| 297 | * will be used |
| 298 | */ |
Guenter Roeck | bb9973e | 2011-06-01 11:03:41 -0700 | [diff] [blame] | 299 | if (val) { |
Carsten Emde | a321ced | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 300 | dev_info(dev, "TjMax is %d C.\n", val); |
| 301 | return val * 1000; |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * An assumption is made for early CPUs and unreadable MSR. |
Guenter Roeck | 4f5f71a | 2011-05-31 06:54:21 -0700 | [diff] [blame] | 307 | * NOTE: the calculated value may not be correct. |
Carsten Emde | a321ced | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 308 | */ |
Guenter Roeck | 4f5f71a | 2011-05-31 06:54:21 -0700 | [diff] [blame] | 309 | return adjust_tjmax(c, id, dev); |
Carsten Emde | a321ced | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Jan Beulich | 3247800 | 2010-10-08 04:59:38 -0400 | [diff] [blame] | 312 | static void __devinit get_ucode_rev_on_cpu(void *edx) |
| 313 | { |
| 314 | u32 eax; |
| 315 | |
| 316 | wrmsr(MSR_IA32_UCODE_REV, 0, 0); |
| 317 | sync_core(); |
| 318 | rdmsr(MSR_IA32_UCODE_REV, eax, *(u32 *)edx); |
| 319 | } |
| 320 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 321 | static int get_pkg_tjmax(unsigned int cpu, struct device *dev) |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 322 | { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 323 | int err; |
| 324 | u32 eax, edx, val; |
| 325 | |
| 326 | err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); |
| 327 | if (!err) { |
| 328 | val = (eax >> 16) & 0xff; |
Guenter Roeck | bb9973e | 2011-06-01 11:03:41 -0700 | [diff] [blame] | 329 | if (val) |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 330 | return val * 1000; |
| 331 | } |
| 332 | dev_warn(dev, "Unable to read Pkg-TjMax from CPU:%u\n", cpu); |
| 333 | return 100000; /* Default TjMax: 100 degree celsius */ |
| 334 | } |
| 335 | |
| 336 | static int create_name_attr(struct platform_data *pdata, struct device *dev) |
| 337 | { |
Sergey Senozhatsky | 4258781 | 2011-05-24 07:28:31 -0400 | [diff] [blame] | 338 | sysfs_attr_init(&pdata->name_attr.attr); |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 339 | pdata->name_attr.attr.name = "name"; |
| 340 | pdata->name_attr.attr.mode = S_IRUGO; |
| 341 | pdata->name_attr.show = show_name; |
| 342 | return device_create_file(dev, &pdata->name_attr); |
| 343 | } |
| 344 | |
| 345 | static int create_core_attrs(struct temp_data *tdata, struct device *dev, |
| 346 | int attr_no) |
| 347 | { |
| 348 | int err, i; |
| 349 | static ssize_t (*rd_ptr[MAX_ATTRS]) (struct device *dev, |
| 350 | struct device_attribute *devattr, char *buf) = { |
| 351 | show_label, show_crit_alarm, show_ttarget, |
| 352 | show_temp, show_tjmax }; |
| 353 | static const char *names[MAX_ATTRS] = { |
| 354 | "temp%d_label", "temp%d_crit_alarm", |
| 355 | "temp%d_max", "temp%d_input", |
| 356 | "temp%d_crit" }; |
| 357 | |
| 358 | for (i = 0; i < MAX_ATTRS; i++) { |
| 359 | snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i], |
| 360 | attr_no); |
Sergey Senozhatsky | 4258781 | 2011-05-24 07:28:31 -0400 | [diff] [blame] | 361 | sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr); |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 362 | tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i]; |
| 363 | tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO; |
| 364 | tdata->sd_attrs[i].dev_attr.show = rd_ptr[i]; |
| 365 | tdata->sd_attrs[i].dev_attr.store = NULL; |
| 366 | tdata->sd_attrs[i].index = attr_no; |
| 367 | err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr); |
| 368 | if (err) |
| 369 | goto exit_free; |
| 370 | } |
| 371 | return 0; |
| 372 | |
| 373 | exit_free: |
| 374 | while (--i >= 0) |
| 375 | device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); |
| 376 | return err; |
| 377 | } |
| 378 | |
| 379 | static void update_ttarget(__u8 cpu_model, struct temp_data *tdata, |
| 380 | struct device *dev) |
| 381 | { |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 382 | int err; |
| 383 | u32 eax, edx; |
| 384 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 385 | /* |
| 386 | * Initialize ttarget value. Eventually this will be |
| 387 | * initialized with the value from MSR_IA32_THERM_INTERRUPT |
| 388 | * register. If IA32_TEMPERATURE_TARGET is supported, this |
| 389 | * value will be over written below. |
| 390 | * To Do: Patch to initialize ttarget from MSR_IA32_THERM_INTERRUPT |
| 391 | */ |
| 392 | tdata->ttarget = tdata->tjmax - 20000; |
| 393 | |
| 394 | /* |
| 395 | * Read the still undocumented IA32_TEMPERATURE_TARGET. It exists |
| 396 | * on older CPUs but not in this register, |
| 397 | * Atoms don't have it either. |
| 398 | */ |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 399 | if (cpu_model > 0xe && cpu_model != 0x1c) { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 400 | err = rdmsr_safe_on_cpu(tdata->cpu, |
| 401 | MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); |
| 402 | if (err) { |
| 403 | dev_warn(dev, |
| 404 | "Unable to read IA32_TEMPERATURE_TARGET MSR\n"); |
| 405 | } else { |
| 406 | tdata->ttarget = tdata->tjmax - |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 407 | ((eax >> 8) & 0xff) * 1000; |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 408 | } |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 409 | } |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 410 | } |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 411 | |
Jean Delvare | 582e1b2 | 2011-05-26 06:01:54 -0400 | [diff] [blame] | 412 | static int __devinit chk_ucode_version(struct platform_device *pdev) |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 413 | { |
| 414 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); |
| 415 | int err; |
| 416 | u32 edx; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 417 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 418 | /* |
| 419 | * Check if we have problem with errata AE18 of Core processors: |
| 420 | * Readings might stop update when processor visited too deep sleep, |
| 421 | * fixed for stepping D0 (6EC). |
| 422 | */ |
Guenter Roeck | 4cc4527 | 2011-05-19 14:45:48 -0700 | [diff] [blame] | 423 | if (c->x86_model == 0xe && c->x86_mask < 0xc) { |
Rudolf Marek | 67f363b | 2007-05-27 22:17:43 +0200 | [diff] [blame] | 424 | /* check for microcode update */ |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 425 | err = smp_call_function_single(pdev->id, get_ucode_rev_on_cpu, |
Jan Beulich | 3247800 | 2010-10-08 04:59:38 -0400 | [diff] [blame] | 426 | &edx, 1); |
| 427 | if (err) { |
| 428 | dev_err(&pdev->dev, |
| 429 | "Cannot determine microcode revision of " |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 430 | "CPU#%u (%d)!\n", pdev->id, err); |
| 431 | return -ENODEV; |
Jan Beulich | 3247800 | 2010-10-08 04:59:38 -0400 | [diff] [blame] | 432 | } else if (edx < 0x39) { |
Rudolf Marek | 67f363b | 2007-05-27 22:17:43 +0200 | [diff] [blame] | 433 | dev_err(&pdev->dev, |
| 434 | "Errata AE18 not fixed, update BIOS or " |
| 435 | "microcode of the CPU!\n"); |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 436 | return -ENODEV; |
Rudolf Marek | 67f363b | 2007-05-27 22:17:43 +0200 | [diff] [blame] | 437 | } |
| 438 | } |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 439 | return 0; |
| 440 | } |
Rudolf Marek | 67f363b | 2007-05-27 22:17:43 +0200 | [diff] [blame] | 441 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 442 | static struct platform_device *coretemp_get_pdev(unsigned int cpu) |
| 443 | { |
| 444 | u16 phys_proc_id = TO_PHYS_ID(cpu); |
| 445 | struct pdev_entry *p; |
| 446 | |
| 447 | mutex_lock(&pdev_list_mutex); |
| 448 | |
| 449 | list_for_each_entry(p, &pdev_list, list) |
| 450 | if (p->phys_proc_id == phys_proc_id) { |
| 451 | mutex_unlock(&pdev_list_mutex); |
| 452 | return p->pdev; |
| 453 | } |
| 454 | |
| 455 | mutex_unlock(&pdev_list_mutex); |
| 456 | return NULL; |
| 457 | } |
| 458 | |
| 459 | static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag) |
| 460 | { |
| 461 | struct temp_data *tdata; |
| 462 | |
| 463 | tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL); |
| 464 | if (!tdata) |
| 465 | return NULL; |
| 466 | |
| 467 | tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS : |
| 468 | MSR_IA32_THERM_STATUS; |
| 469 | tdata->is_pkg_data = pkg_flag; |
| 470 | tdata->cpu = cpu; |
| 471 | tdata->cpu_core_id = TO_CORE_ID(cpu); |
| 472 | mutex_init(&tdata->update_lock); |
| 473 | return tdata; |
| 474 | } |
| 475 | |
| 476 | static int create_core_data(struct platform_data *pdata, |
| 477 | struct platform_device *pdev, |
| 478 | unsigned int cpu, int pkg_flag) |
| 479 | { |
| 480 | struct temp_data *tdata; |
| 481 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
| 482 | u32 eax, edx; |
| 483 | int err, attr_no; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 484 | |
Carsten Emde | a321ced | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 485 | /* |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 486 | * Find attr number for sysfs: |
| 487 | * We map the attr number to core id of the CPU |
| 488 | * The attr number is always core id + 2 |
| 489 | * The Pkgtemp will always show up as temp1_*, if available |
Carsten Emde | a321ced | 2010-05-24 14:33:41 -0700 | [diff] [blame] | 490 | */ |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 491 | attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu); |
Rudolf Marek | 6369a288 | 2008-01-18 00:42:54 +0100 | [diff] [blame] | 492 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 493 | if (attr_no > MAX_CORE_DATA - 1) |
| 494 | return -ERANGE; |
Rudolf Marek | 6369a288 | 2008-01-18 00:42:54 +0100 | [diff] [blame] | 495 | |
Guenter Roeck | f4e0bcf | 2011-05-23 14:05:38 -0700 | [diff] [blame] | 496 | /* |
| 497 | * Provide a single set of attributes for all HT siblings of a core |
| 498 | * to avoid duplicate sensors (the processor ID and core ID of all |
Guenter Roeck | 6777b9e | 2011-05-23 13:52:35 -0700 | [diff] [blame] | 499 | * HT siblings of a core are the same). |
| 500 | * Skip if a HT sibling of this core is already registered. |
Guenter Roeck | f4e0bcf | 2011-05-23 14:05:38 -0700 | [diff] [blame] | 501 | * This is not an error. |
| 502 | */ |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 503 | if (pdata->core_data[attr_no] != NULL) |
| 504 | return 0; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 505 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 506 | tdata = init_temp_data(cpu, pkg_flag); |
| 507 | if (!tdata) |
| 508 | return -ENOMEM; |
| 509 | |
| 510 | /* Test if we can access the status register */ |
| 511 | err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx); |
| 512 | if (err) |
| 513 | goto exit_free; |
| 514 | |
| 515 | /* We can access status register. Get Critical Temperature */ |
| 516 | if (pkg_flag) |
| 517 | tdata->tjmax = get_pkg_tjmax(pdev->id, &pdev->dev); |
| 518 | else |
| 519 | tdata->tjmax = get_tjmax(c, cpu, &pdev->dev); |
| 520 | |
| 521 | update_ttarget(c->x86_model, tdata, &pdev->dev); |
| 522 | pdata->core_data[attr_no] = tdata; |
| 523 | |
| 524 | /* Create sysfs interfaces */ |
| 525 | err = create_core_attrs(tdata, &pdev->dev, attr_no); |
| 526 | if (err) |
| 527 | goto exit_free; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 528 | |
| 529 | return 0; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 530 | exit_free: |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 531 | kfree(tdata); |
| 532 | return err; |
| 533 | } |
| 534 | |
| 535 | static void coretemp_add_core(unsigned int cpu, int pkg_flag) |
| 536 | { |
| 537 | struct platform_data *pdata; |
| 538 | struct platform_device *pdev = coretemp_get_pdev(cpu); |
| 539 | int err; |
| 540 | |
| 541 | if (!pdev) |
| 542 | return; |
| 543 | |
| 544 | pdata = platform_get_drvdata(pdev); |
| 545 | |
| 546 | err = create_core_data(pdata, pdev, cpu, pkg_flag); |
| 547 | if (err) |
| 548 | dev_err(&pdev->dev, "Adding Core %u failed\n", cpu); |
| 549 | } |
| 550 | |
| 551 | static void coretemp_remove_core(struct platform_data *pdata, |
| 552 | struct device *dev, int indx) |
| 553 | { |
| 554 | int i; |
| 555 | struct temp_data *tdata = pdata->core_data[indx]; |
| 556 | |
| 557 | /* Remove the sysfs attributes */ |
| 558 | for (i = 0; i < MAX_ATTRS; i++) |
| 559 | device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); |
| 560 | |
| 561 | kfree(pdata->core_data[indx]); |
| 562 | pdata->core_data[indx] = NULL; |
| 563 | } |
| 564 | |
| 565 | static int __devinit coretemp_probe(struct platform_device *pdev) |
| 566 | { |
| 567 | struct platform_data *pdata; |
| 568 | int err; |
| 569 | |
| 570 | /* Check the microcode version of the CPU */ |
| 571 | err = chk_ucode_version(pdev); |
| 572 | if (err) |
| 573 | return err; |
| 574 | |
| 575 | /* Initialize the per-package data structures */ |
| 576 | pdata = kzalloc(sizeof(struct platform_data), GFP_KERNEL); |
| 577 | if (!pdata) |
| 578 | return -ENOMEM; |
| 579 | |
| 580 | err = create_name_attr(pdata, &pdev->dev); |
| 581 | if (err) |
| 582 | goto exit_free; |
| 583 | |
| 584 | pdata->phys_proc_id = TO_PHYS_ID(pdev->id); |
| 585 | platform_set_drvdata(pdev, pdata); |
| 586 | |
| 587 | pdata->hwmon_dev = hwmon_device_register(&pdev->dev); |
| 588 | if (IS_ERR(pdata->hwmon_dev)) { |
| 589 | err = PTR_ERR(pdata->hwmon_dev); |
| 590 | dev_err(&pdev->dev, "Class registration failed (%d)\n", err); |
| 591 | goto exit_name; |
| 592 | } |
| 593 | return 0; |
| 594 | |
| 595 | exit_name: |
| 596 | device_remove_file(&pdev->dev, &pdata->name_attr); |
| 597 | platform_set_drvdata(pdev, NULL); |
| 598 | exit_free: |
| 599 | kfree(pdata); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 600 | return err; |
| 601 | } |
| 602 | |
| 603 | static int __devexit coretemp_remove(struct platform_device *pdev) |
| 604 | { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 605 | struct platform_data *pdata = platform_get_drvdata(pdev); |
| 606 | int i; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 607 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 608 | for (i = MAX_CORE_DATA - 1; i >= 0; --i) |
| 609 | if (pdata->core_data[i]) |
| 610 | coretemp_remove_core(pdata, &pdev->dev, i); |
| 611 | |
| 612 | device_remove_file(&pdev->dev, &pdata->name_attr); |
| 613 | hwmon_device_unregister(pdata->hwmon_dev); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 614 | platform_set_drvdata(pdev, NULL); |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 615 | kfree(pdata); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static struct platform_driver coretemp_driver = { |
| 620 | .driver = { |
| 621 | .owner = THIS_MODULE, |
| 622 | .name = DRVNAME, |
| 623 | }, |
| 624 | .probe = coretemp_probe, |
| 625 | .remove = __devexit_p(coretemp_remove), |
| 626 | }; |
| 627 | |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 628 | static int __cpuinit coretemp_device_add(unsigned int cpu) |
| 629 | { |
| 630 | int err; |
| 631 | struct platform_device *pdev; |
| 632 | struct pdev_entry *pdev_entry; |
Jean Delvare | d883b9f | 2010-07-09 16:22:49 +0200 | [diff] [blame] | 633 | |
| 634 | mutex_lock(&pdev_list_mutex); |
| 635 | |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 636 | pdev = platform_device_alloc(DRVNAME, cpu); |
| 637 | if (!pdev) { |
| 638 | err = -ENOMEM; |
Joe Perches | f8bb892 | 2010-10-20 06:51:31 +0000 | [diff] [blame] | 639 | pr_err("Device allocation failed\n"); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 640 | goto exit; |
| 641 | } |
| 642 | |
| 643 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); |
| 644 | if (!pdev_entry) { |
| 645 | err = -ENOMEM; |
| 646 | goto exit_device_put; |
| 647 | } |
| 648 | |
| 649 | err = platform_device_add(pdev); |
| 650 | if (err) { |
Joe Perches | f8bb892 | 2010-10-20 06:51:31 +0000 | [diff] [blame] | 651 | pr_err("Device addition failed (%d)\n", err); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 652 | goto exit_device_free; |
| 653 | } |
| 654 | |
| 655 | pdev_entry->pdev = pdev; |
| 656 | pdev_entry->cpu = cpu; |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 657 | pdev_entry->phys_proc_id = TO_PHYS_ID(cpu); |
| 658 | pdev_entry->cpu_core_id = TO_CORE_ID(cpu); |
| 659 | |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 660 | list_add_tail(&pdev_entry->list, &pdev_list); |
| 661 | mutex_unlock(&pdev_list_mutex); |
| 662 | |
| 663 | return 0; |
| 664 | |
| 665 | exit_device_free: |
| 666 | kfree(pdev_entry); |
| 667 | exit_device_put: |
| 668 | platform_device_put(pdev); |
| 669 | exit: |
Jean Delvare | d883b9f | 2010-07-09 16:22:49 +0200 | [diff] [blame] | 670 | mutex_unlock(&pdev_list_mutex); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 671 | return err; |
| 672 | } |
| 673 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 674 | static void coretemp_device_remove(unsigned int cpu) |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 675 | { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 676 | struct pdev_entry *p, *n; |
| 677 | u16 phys_proc_id = TO_PHYS_ID(cpu); |
Jan Beulich | e40cc4b | 2010-09-13 10:23:05 +0000 | [diff] [blame] | 678 | |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 679 | mutex_lock(&pdev_list_mutex); |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 680 | list_for_each_entry_safe(p, n, &pdev_list, list) { |
| 681 | if (p->phys_proc_id != phys_proc_id) |
Jan Beulich | e40cc4b | 2010-09-13 10:23:05 +0000 | [diff] [blame] | 682 | continue; |
Jan Beulich | e40cc4b | 2010-09-13 10:23:05 +0000 | [diff] [blame] | 683 | platform_device_unregister(p->pdev); |
| 684 | list_del(&p->list); |
Jan Beulich | e40cc4b | 2010-09-13 10:23:05 +0000 | [diff] [blame] | 685 | kfree(p); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 686 | } |
| 687 | mutex_unlock(&pdev_list_mutex); |
| 688 | } |
| 689 | |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 690 | static bool is_any_core_online(struct platform_data *pdata) |
| 691 | { |
| 692 | int i; |
| 693 | |
| 694 | /* Find online cores, except pkgtemp data */ |
| 695 | for (i = MAX_CORE_DATA - 1; i >= 0; --i) { |
| 696 | if (pdata->core_data[i] && |
| 697 | !pdata->core_data[i]->is_pkg_data) { |
| 698 | return true; |
| 699 | } |
| 700 | } |
| 701 | return false; |
| 702 | } |
| 703 | |
| 704 | static void __cpuinit get_core_online(unsigned int cpu) |
| 705 | { |
| 706 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
| 707 | struct platform_device *pdev = coretemp_get_pdev(cpu); |
| 708 | int err; |
| 709 | |
| 710 | /* |
| 711 | * CPUID.06H.EAX[0] indicates whether the CPU has thermal |
| 712 | * sensors. We check this bit only, all the early CPUs |
| 713 | * without thermal sensors will be filtered out. |
| 714 | */ |
| 715 | if (!cpu_has(c, X86_FEATURE_DTS)) |
| 716 | return; |
| 717 | |
| 718 | if (!pdev) { |
| 719 | /* |
| 720 | * Alright, we have DTS support. |
| 721 | * We are bringing the _first_ core in this pkg |
| 722 | * online. So, initialize per-pkg data structures and |
| 723 | * then bring this core online. |
| 724 | */ |
| 725 | err = coretemp_device_add(cpu); |
| 726 | if (err) |
| 727 | return; |
| 728 | /* |
| 729 | * Check whether pkgtemp support is available. |
| 730 | * If so, add interfaces for pkgtemp. |
| 731 | */ |
| 732 | if (cpu_has(c, X86_FEATURE_PTS)) |
| 733 | coretemp_add_core(cpu, 1); |
| 734 | } |
| 735 | /* |
| 736 | * Physical CPU device already exists. |
| 737 | * So, just add interfaces for this core. |
| 738 | */ |
| 739 | coretemp_add_core(cpu, 0); |
| 740 | } |
| 741 | |
| 742 | static void __cpuinit put_core_offline(unsigned int cpu) |
| 743 | { |
| 744 | int i, indx; |
| 745 | struct platform_data *pdata; |
| 746 | struct platform_device *pdev = coretemp_get_pdev(cpu); |
| 747 | |
| 748 | /* If the physical CPU device does not exist, just return */ |
| 749 | if (!pdev) |
| 750 | return; |
| 751 | |
| 752 | pdata = platform_get_drvdata(pdev); |
| 753 | |
| 754 | indx = TO_ATTR_NO(cpu); |
| 755 | |
| 756 | if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu) |
| 757 | coretemp_remove_core(pdata, &pdev->dev, indx); |
| 758 | |
Guenter Roeck | f4e0bcf | 2011-05-23 14:05:38 -0700 | [diff] [blame] | 759 | /* |
Guenter Roeck | 6777b9e | 2011-05-23 13:52:35 -0700 | [diff] [blame] | 760 | * If a HT sibling of a core is taken offline, but another HT sibling |
| 761 | * of the same core is still online, register the alternate sibling. |
| 762 | * This ensures that exactly one set of attributes is provided as long |
| 763 | * as at least one HT sibling of a core is online. |
Guenter Roeck | f4e0bcf | 2011-05-23 14:05:38 -0700 | [diff] [blame] | 764 | */ |
Guenter Roeck | bb74e8c | 2011-05-23 12:06:41 -0700 | [diff] [blame] | 765 | for_each_sibling(i, cpu) { |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 766 | if (i != cpu) { |
| 767 | get_core_online(i); |
Guenter Roeck | f4e0bcf | 2011-05-23 14:05:38 -0700 | [diff] [blame] | 768 | /* |
| 769 | * Display temperature sensor data for one HT sibling |
| 770 | * per core only, so abort the loop after one such |
| 771 | * sibling has been found. |
| 772 | */ |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 773 | break; |
| 774 | } |
| 775 | } |
| 776 | /* |
| 777 | * If all cores in this pkg are offline, remove the device. |
| 778 | * coretemp_device_remove calls unregister_platform_device, |
| 779 | * which in turn calls coretemp_remove. This removes the |
| 780 | * pkgtemp entry and does other clean ups. |
| 781 | */ |
| 782 | if (!is_any_core_online(pdata)) |
| 783 | coretemp_device_remove(cpu); |
| 784 | } |
| 785 | |
Sam Ravnborg | ba7c192 | 2008-02-17 13:22:51 +0100 | [diff] [blame] | 786 | static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 787 | unsigned long action, void *hcpu) |
| 788 | { |
| 789 | unsigned int cpu = (unsigned long) hcpu; |
| 790 | |
| 791 | switch (action) { |
| 792 | case CPU_ONLINE: |
Rafael J. Wysocki | 561d9a9 | 2007-12-03 18:01:50 +0100 | [diff] [blame] | 793 | case CPU_DOWN_FAILED: |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 794 | get_core_online(cpu); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 795 | break; |
Rafael J. Wysocki | 561d9a9 | 2007-12-03 18:01:50 +0100 | [diff] [blame] | 796 | case CPU_DOWN_PREPARE: |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 797 | put_core_offline(cpu); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 798 | break; |
| 799 | } |
| 800 | return NOTIFY_OK; |
| 801 | } |
| 802 | |
Sam Ravnborg | ba7c192 | 2008-02-17 13:22:51 +0100 | [diff] [blame] | 803 | static struct notifier_block coretemp_cpu_notifier __refdata = { |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 804 | .notifier_call = coretemp_cpu_callback, |
| 805 | }; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 806 | |
| 807 | static int __init coretemp_init(void) |
| 808 | { |
| 809 | int i, err = -ENODEV; |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 810 | |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 811 | /* quick check if we run Intel */ |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 812 | if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL) |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 813 | goto exit; |
| 814 | |
| 815 | err = platform_driver_register(&coretemp_driver); |
| 816 | if (err) |
| 817 | goto exit; |
| 818 | |
Jan Beulich | a465905 | 2010-09-23 22:21:34 -0700 | [diff] [blame] | 819 | for_each_online_cpu(i) |
Durgadoss R | 199e0de | 2011-05-20 01:29:35 +0530 | [diff] [blame] | 820 | get_core_online(i); |
Jan Beulich | 89a3fd3 | 2010-09-13 10:05:51 +0000 | [diff] [blame] | 821 | |
| 822 | #ifndef CONFIG_HOTPLUG_CPU |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 823 | if (list_empty(&pdev_list)) { |
| 824 | err = -ENODEV; |
| 825 | goto exit_driver_unreg; |
| 826 | } |
Jan Beulich | 89a3fd3 | 2010-09-13 10:05:51 +0000 | [diff] [blame] | 827 | #endif |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 828 | |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 829 | register_hotcpu_notifier(&coretemp_cpu_notifier); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 830 | return 0; |
| 831 | |
Chen Gong | 0dca94b | 2010-08-09 17:21:09 -0700 | [diff] [blame] | 832 | #ifndef CONFIG_HOTPLUG_CPU |
Jan Beulich | 89a3fd3 | 2010-09-13 10:05:51 +0000 | [diff] [blame] | 833 | exit_driver_unreg: |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 834 | platform_driver_unregister(&coretemp_driver); |
Chen Gong | 0dca94b | 2010-08-09 17:21:09 -0700 | [diff] [blame] | 835 | #endif |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 836 | exit: |
| 837 | return err; |
| 838 | } |
| 839 | |
| 840 | static void __exit coretemp_exit(void) |
| 841 | { |
| 842 | struct pdev_entry *p, *n; |
Chen Gong | 17c10d6 | 2010-10-08 22:01:48 -0400 | [diff] [blame] | 843 | |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 844 | unregister_hotcpu_notifier(&coretemp_cpu_notifier); |
Rudolf Marek | bebe467 | 2007-05-08 17:22:02 +0200 | [diff] [blame] | 845 | mutex_lock(&pdev_list_mutex); |
| 846 | list_for_each_entry_safe(p, n, &pdev_list, list) { |
| 847 | platform_device_unregister(p->pdev); |
| 848 | list_del(&p->list); |
| 849 | kfree(p); |
| 850 | } |
| 851 | mutex_unlock(&pdev_list_mutex); |
| 852 | platform_driver_unregister(&coretemp_driver); |
| 853 | } |
| 854 | |
| 855 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); |
| 856 | MODULE_DESCRIPTION("Intel Core temperature monitor"); |
| 857 | MODULE_LICENSE("GPL"); |
| 858 | |
| 859 | module_init(coretemp_init) |
| 860 | module_exit(coretemp_exit) |