Commit | Line | Data |
---|---|---|
bebe4678 RM |
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 | ||
f8bb8925 JP |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
bebe4678 | 25 | #include <linux/module.h> |
bebe4678 RM |
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> | |
1fe63ab4 | 37 | #include <linux/pci.h> |
4cc45275 | 38 | #include <linux/smp.h> |
bebe4678 RM |
39 | #include <asm/msr.h> |
40 | #include <asm/processor.h> | |
41 | ||
42 | #define DRVNAME "coretemp" | |
43 | ||
199e0de7 D |
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) | |
bb74e8ca | 54 | #define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu)) |
199e0de7 D |
55 | #else |
56 | #define TO_PHYS_ID(cpu) (cpu) | |
57 | #define TO_CORE_ID(cpu) (cpu) | |
58 | #define TO_ATTR_NO(cpu) (cpu) | |
bb74e8ca | 59 | #define for_each_sibling(i, cpu) for (i = 0; false; ) |
199e0de7 | 60 | #endif |
bebe4678 RM |
61 | |
62 | /* | |
199e0de7 D |
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. | |
bebe4678 | 73 | */ |
199e0de7 | 74 | struct temp_data { |
bebe4678 | 75 | int temp; |
6369a288 | 76 | int ttarget; |
199e0de7 D |
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; | |
bebe4678 RM |
87 | }; |
88 | ||
199e0de7 D |
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 | }; | |
bebe4678 | 96 | |
199e0de7 D |
97 | struct pdev_entry { |
98 | struct list_head list; | |
99 | struct platform_device *pdev; | |
199e0de7 | 100 | u16 phys_proc_id; |
199e0de7 D |
101 | }; |
102 | ||
103 | static LIST_HEAD(pdev_list); | |
104 | static DEFINE_MUTEX(pdev_list_mutex); | |
105 | ||
106 | static ssize_t show_name(struct device *dev, | |
107 | struct device_attribute *devattr, char *buf) | |
108 | { | |
109 | return sprintf(buf, "%s\n", DRVNAME); | |
110 | } | |
111 | ||
112 | static ssize_t show_label(struct device *dev, | |
113 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 114 | { |
bebe4678 | 115 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
199e0de7 D |
116 | struct platform_data *pdata = dev_get_drvdata(dev); |
117 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
118 | ||
119 | if (tdata->is_pkg_data) | |
120 | return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id); | |
bebe4678 | 121 | |
199e0de7 | 122 | return sprintf(buf, "Core %u\n", tdata->cpu_core_id); |
bebe4678 RM |
123 | } |
124 | ||
199e0de7 D |
125 | static ssize_t show_crit_alarm(struct device *dev, |
126 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 127 | { |
199e0de7 D |
128 | u32 eax, edx; |
129 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
130 | struct platform_data *pdata = dev_get_drvdata(dev); | |
131 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
132 | ||
133 | rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx); | |
134 | ||
135 | return sprintf(buf, "%d\n", (eax >> 5) & 1); | |
bebe4678 RM |
136 | } |
137 | ||
199e0de7 D |
138 | static ssize_t show_tjmax(struct device *dev, |
139 | struct device_attribute *devattr, char *buf) | |
bebe4678 RM |
140 | { |
141 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
199e0de7 | 142 | struct platform_data *pdata = dev_get_drvdata(dev); |
bebe4678 | 143 | |
199e0de7 | 144 | return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax); |
bebe4678 RM |
145 | } |
146 | ||
199e0de7 D |
147 | static ssize_t show_ttarget(struct device *dev, |
148 | struct device_attribute *devattr, char *buf) | |
149 | { | |
150 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
151 | struct platform_data *pdata = dev_get_drvdata(dev); | |
bebe4678 | 152 | |
199e0de7 D |
153 | return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget); |
154 | } | |
bebe4678 | 155 | |
199e0de7 D |
156 | static ssize_t show_temp(struct device *dev, |
157 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 158 | { |
199e0de7 D |
159 | u32 eax, edx; |
160 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
161 | struct platform_data *pdata = dev_get_drvdata(dev); | |
162 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
bebe4678 | 163 | |
199e0de7 | 164 | mutex_lock(&tdata->update_lock); |
bebe4678 | 165 | |
199e0de7 D |
166 | /* Check whether the time interval has elapsed */ |
167 | if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) { | |
168 | rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx); | |
169 | tdata->valid = 0; | |
170 | /* Check whether the data is valid */ | |
bebe4678 | 171 | if (eax & 0x80000000) { |
199e0de7 | 172 | tdata->temp = tdata->tjmax - |
4cc45275 | 173 | ((eax >> 16) & 0x7f) * 1000; |
199e0de7 | 174 | tdata->valid = 1; |
bebe4678 | 175 | } |
199e0de7 | 176 | tdata->last_updated = jiffies; |
bebe4678 RM |
177 | } |
178 | ||
199e0de7 D |
179 | mutex_unlock(&tdata->update_lock); |
180 | return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN; | |
bebe4678 RM |
181 | } |
182 | ||
199e0de7 | 183 | static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) |
118a8871 RM |
184 | { |
185 | /* The 100C is default for both mobile and non mobile CPUs */ | |
186 | ||
187 | int tjmax = 100000; | |
eccfed42 | 188 | int tjmax_ee = 85000; |
708a62bc | 189 | int usemsr_ee = 1; |
118a8871 RM |
190 | int err; |
191 | u32 eax, edx; | |
1fe63ab4 | 192 | struct pci_dev *host_bridge; |
118a8871 RM |
193 | |
194 | /* Early chips have no MSR for TjMax */ | |
195 | ||
4cc45275 | 196 | if (c->x86_model == 0xf && c->x86_mask < 4) |
708a62bc | 197 | usemsr_ee = 0; |
118a8871 | 198 | |
1fe63ab4 | 199 | /* Atom CPUs */ |
708a62bc RM |
200 | |
201 | if (c->x86_model == 0x1c) { | |
202 | usemsr_ee = 0; | |
1fe63ab4 YW |
203 | |
204 | host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0)); | |
205 | ||
206 | if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL | |
207 | && (host_bridge->device == 0xa000 /* NM10 based nettop */ | |
208 | || host_bridge->device == 0xa010)) /* NM10 based netbook */ | |
209 | tjmax = 100000; | |
210 | else | |
211 | tjmax = 90000; | |
212 | ||
213 | pci_dev_put(host_bridge); | |
708a62bc RM |
214 | } |
215 | ||
4cc45275 | 216 | if (c->x86_model > 0xe && usemsr_ee) { |
eccfed42 | 217 | u8 platform_id; |
118a8871 | 218 | |
4cc45275 GR |
219 | /* |
220 | * Now we can detect the mobile CPU using Intel provided table | |
221 | * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm | |
222 | * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU | |
223 | */ | |
118a8871 RM |
224 | err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx); |
225 | if (err) { | |
226 | dev_warn(dev, | |
227 | "Unable to access MSR 0x17, assuming desktop" | |
228 | " CPU\n"); | |
708a62bc | 229 | usemsr_ee = 0; |
eccfed42 | 230 | } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) { |
4cc45275 GR |
231 | /* |
232 | * Trust bit 28 up to Penryn, I could not find any | |
233 | * documentation on that; if you happen to know | |
234 | * someone at Intel please ask | |
235 | */ | |
708a62bc | 236 | usemsr_ee = 0; |
eccfed42 RM |
237 | } else { |
238 | /* Platform ID bits 52:50 (EDX starts at bit 32) */ | |
239 | platform_id = (edx >> 18) & 0x7; | |
240 | ||
4cc45275 GR |
241 | /* |
242 | * Mobile Penryn CPU seems to be platform ID 7 or 5 | |
243 | * (guesswork) | |
244 | */ | |
245 | if (c->x86_model == 0x17 && | |
246 | (platform_id == 5 || platform_id == 7)) { | |
247 | /* | |
248 | * If MSR EE bit is set, set it to 90 degrees C, | |
249 | * otherwise 105 degrees C | |
250 | */ | |
eccfed42 RM |
251 | tjmax_ee = 90000; |
252 | tjmax = 105000; | |
253 | } | |
118a8871 RM |
254 | } |
255 | } | |
256 | ||
708a62bc | 257 | if (usemsr_ee) { |
118a8871 RM |
258 | err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx); |
259 | if (err) { | |
260 | dev_warn(dev, | |
261 | "Unable to access MSR 0xEE, for Tjmax, left" | |
4d7a5644 | 262 | " at default\n"); |
118a8871 | 263 | } else if (eax & 0x40000000) { |
eccfed42 | 264 | tjmax = tjmax_ee; |
118a8871 | 265 | } |
708a62bc | 266 | } else if (tjmax == 100000) { |
4cc45275 GR |
267 | /* |
268 | * If we don't use msr EE it means we are desktop CPU | |
269 | * (with exeception of Atom) | |
270 | */ | |
118a8871 RM |
271 | dev_warn(dev, "Using relative temperature scale!\n"); |
272 | } | |
273 | ||
274 | return tjmax; | |
275 | } | |
276 | ||
199e0de7 | 277 | static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) |
a321cedb CE |
278 | { |
279 | /* The 100C is default for both mobile and non mobile CPUs */ | |
280 | int err; | |
281 | u32 eax, edx; | |
282 | u32 val; | |
283 | ||
4cc45275 GR |
284 | /* |
285 | * A new feature of current Intel(R) processors, the | |
286 | * IA32_TEMPERATURE_TARGET contains the TjMax value | |
287 | */ | |
a321cedb CE |
288 | err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); |
289 | if (err) { | |
290 | dev_warn(dev, "Unable to read TjMax from CPU.\n"); | |
291 | } else { | |
292 | val = (eax >> 16) & 0xff; | |
293 | /* | |
294 | * If the TjMax is not plausible, an assumption | |
295 | * will be used | |
296 | */ | |
bb9973e4 | 297 | if (val) { |
a321cedb CE |
298 | dev_info(dev, "TjMax is %d C.\n", val); |
299 | return val * 1000; | |
300 | } | |
301 | } | |
302 | ||
303 | /* | |
304 | * An assumption is made for early CPUs and unreadable MSR. | |
4f5f71a7 | 305 | * NOTE: the calculated value may not be correct. |
a321cedb | 306 | */ |
4f5f71a7 | 307 | return adjust_tjmax(c, id, dev); |
a321cedb CE |
308 | } |
309 | ||
32478006 JB |
310 | static void __devinit get_ucode_rev_on_cpu(void *edx) |
311 | { | |
312 | u32 eax; | |
313 | ||
314 | wrmsr(MSR_IA32_UCODE_REV, 0, 0); | |
315 | sync_core(); | |
316 | rdmsr(MSR_IA32_UCODE_REV, eax, *(u32 *)edx); | |
317 | } | |
318 | ||
199e0de7 | 319 | static int get_pkg_tjmax(unsigned int cpu, struct device *dev) |
bebe4678 | 320 | { |
bebe4678 | 321 | int err; |
199e0de7 | 322 | u32 eax, edx, val; |
bebe4678 | 323 | |
199e0de7 D |
324 | err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); |
325 | if (!err) { | |
326 | val = (eax >> 16) & 0xff; | |
bb9973e4 | 327 | if (val) |
199e0de7 | 328 | return val * 1000; |
bebe4678 | 329 | } |
199e0de7 D |
330 | dev_warn(dev, "Unable to read Pkg-TjMax from CPU:%u\n", cpu); |
331 | return 100000; /* Default TjMax: 100 degree celsius */ | |
332 | } | |
bebe4678 | 333 | |
199e0de7 D |
334 | static int create_name_attr(struct platform_data *pdata, struct device *dev) |
335 | { | |
4258781a | 336 | sysfs_attr_init(&pdata->name_attr.attr); |
199e0de7 D |
337 | pdata->name_attr.attr.name = "name"; |
338 | pdata->name_attr.attr.mode = S_IRUGO; | |
339 | pdata->name_attr.show = show_name; | |
340 | return device_create_file(dev, &pdata->name_attr); | |
341 | } | |
bebe4678 | 342 | |
199e0de7 D |
343 | static int create_core_attrs(struct temp_data *tdata, struct device *dev, |
344 | int attr_no) | |
345 | { | |
346 | int err, i; | |
347 | static ssize_t (*rd_ptr[MAX_ATTRS]) (struct device *dev, | |
348 | struct device_attribute *devattr, char *buf) = { | |
349 | show_label, show_crit_alarm, show_ttarget, | |
350 | show_temp, show_tjmax }; | |
351 | static const char *names[MAX_ATTRS] = { | |
352 | "temp%d_label", "temp%d_crit_alarm", | |
353 | "temp%d_max", "temp%d_input", | |
354 | "temp%d_crit" }; | |
355 | ||
356 | for (i = 0; i < MAX_ATTRS; i++) { | |
357 | snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i], | |
358 | attr_no); | |
4258781a | 359 | sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr); |
199e0de7 D |
360 | tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i]; |
361 | tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO; | |
362 | tdata->sd_attrs[i].dev_attr.show = rd_ptr[i]; | |
363 | tdata->sd_attrs[i].dev_attr.store = NULL; | |
364 | tdata->sd_attrs[i].index = attr_no; | |
365 | err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr); | |
366 | if (err) | |
367 | goto exit_free; | |
bebe4678 | 368 | } |
199e0de7 D |
369 | return 0; |
370 | ||
371 | exit_free: | |
372 | while (--i >= 0) | |
373 | device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); | |
374 | return err; | |
375 | } | |
376 | ||
377 | static void update_ttarget(__u8 cpu_model, struct temp_data *tdata, | |
378 | struct device *dev) | |
379 | { | |
380 | int err; | |
381 | u32 eax, edx; | |
382 | ||
383 | /* | |
384 | * Initialize ttarget value. Eventually this will be | |
385 | * initialized with the value from MSR_IA32_THERM_INTERRUPT | |
386 | * register. If IA32_TEMPERATURE_TARGET is supported, this | |
387 | * value will be over written below. | |
388 | * To Do: Patch to initialize ttarget from MSR_IA32_THERM_INTERRUPT | |
389 | */ | |
390 | tdata->ttarget = tdata->tjmax - 20000; | |
bebe4678 | 391 | |
199e0de7 D |
392 | /* |
393 | * Read the still undocumented IA32_TEMPERATURE_TARGET. It exists | |
394 | * on older CPUs but not in this register, | |
395 | * Atoms don't have it either. | |
396 | */ | |
4cc45275 | 397 | if (cpu_model > 0xe && cpu_model != 0x1c) { |
199e0de7 D |
398 | err = rdmsr_safe_on_cpu(tdata->cpu, |
399 | MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); | |
400 | if (err) { | |
401 | dev_warn(dev, | |
402 | "Unable to read IA32_TEMPERATURE_TARGET MSR\n"); | |
403 | } else { | |
404 | tdata->ttarget = tdata->tjmax - | |
4cc45275 | 405 | ((eax >> 8) & 0xff) * 1000; |
199e0de7 D |
406 | } |
407 | } | |
408 | } | |
409 | ||
582e1b27 | 410 | static int __devinit chk_ucode_version(struct platform_device *pdev) |
199e0de7 D |
411 | { |
412 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); | |
413 | int err; | |
414 | u32 edx; | |
67f363b1 | 415 | |
199e0de7 D |
416 | /* |
417 | * Check if we have problem with errata AE18 of Core processors: | |
418 | * Readings might stop update when processor visited too deep sleep, | |
419 | * fixed for stepping D0 (6EC). | |
420 | */ | |
4cc45275 | 421 | if (c->x86_model == 0xe && c->x86_mask < 0xc) { |
67f363b1 | 422 | /* check for microcode update */ |
199e0de7 | 423 | err = smp_call_function_single(pdev->id, get_ucode_rev_on_cpu, |
32478006 JB |
424 | &edx, 1); |
425 | if (err) { | |
426 | dev_err(&pdev->dev, | |
427 | "Cannot determine microcode revision of " | |
199e0de7 D |
428 | "CPU#%u (%d)!\n", pdev->id, err); |
429 | return -ENODEV; | |
32478006 | 430 | } else if (edx < 0x39) { |
67f363b1 RM |
431 | dev_err(&pdev->dev, |
432 | "Errata AE18 not fixed, update BIOS or " | |
433 | "microcode of the CPU!\n"); | |
199e0de7 | 434 | return -ENODEV; |
67f363b1 RM |
435 | } |
436 | } | |
199e0de7 D |
437 | return 0; |
438 | } | |
439 | ||
440 | static struct platform_device *coretemp_get_pdev(unsigned int cpu) | |
441 | { | |
442 | u16 phys_proc_id = TO_PHYS_ID(cpu); | |
443 | struct pdev_entry *p; | |
444 | ||
445 | mutex_lock(&pdev_list_mutex); | |
446 | ||
447 | list_for_each_entry(p, &pdev_list, list) | |
448 | if (p->phys_proc_id == phys_proc_id) { | |
449 | mutex_unlock(&pdev_list_mutex); | |
450 | return p->pdev; | |
451 | } | |
452 | ||
453 | mutex_unlock(&pdev_list_mutex); | |
454 | return NULL; | |
455 | } | |
456 | ||
457 | static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag) | |
458 | { | |
459 | struct temp_data *tdata; | |
460 | ||
461 | tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL); | |
462 | if (!tdata) | |
463 | return NULL; | |
464 | ||
465 | tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS : | |
466 | MSR_IA32_THERM_STATUS; | |
467 | tdata->is_pkg_data = pkg_flag; | |
468 | tdata->cpu = cpu; | |
469 | tdata->cpu_core_id = TO_CORE_ID(cpu); | |
470 | mutex_init(&tdata->update_lock); | |
471 | return tdata; | |
472 | } | |
67f363b1 | 473 | |
199e0de7 D |
474 | static int create_core_data(struct platform_data *pdata, |
475 | struct platform_device *pdev, | |
476 | unsigned int cpu, int pkg_flag) | |
477 | { | |
478 | struct temp_data *tdata; | |
479 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
480 | u32 eax, edx; | |
481 | int err, attr_no; | |
bebe4678 | 482 | |
a321cedb | 483 | /* |
199e0de7 D |
484 | * Find attr number for sysfs: |
485 | * We map the attr number to core id of the CPU | |
486 | * The attr number is always core id + 2 | |
487 | * The Pkgtemp will always show up as temp1_*, if available | |
a321cedb | 488 | */ |
199e0de7 | 489 | attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu); |
6369a288 | 490 | |
199e0de7 D |
491 | if (attr_no > MAX_CORE_DATA - 1) |
492 | return -ERANGE; | |
493 | ||
f4e0bcf0 GR |
494 | /* |
495 | * Provide a single set of attributes for all HT siblings of a core | |
496 | * to avoid duplicate sensors (the processor ID and core ID of all | |
6777b9e4 GR |
497 | * HT siblings of a core are the same). |
498 | * Skip if a HT sibling of this core is already registered. | |
f4e0bcf0 GR |
499 | * This is not an error. |
500 | */ | |
199e0de7 D |
501 | if (pdata->core_data[attr_no] != NULL) |
502 | return 0; | |
6369a288 | 503 | |
199e0de7 D |
504 | tdata = init_temp_data(cpu, pkg_flag); |
505 | if (!tdata) | |
506 | return -ENOMEM; | |
bebe4678 | 507 | |
199e0de7 D |
508 | /* Test if we can access the status register */ |
509 | err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx); | |
510 | if (err) | |
511 | goto exit_free; | |
512 | ||
513 | /* We can access status register. Get Critical Temperature */ | |
514 | if (pkg_flag) | |
515 | tdata->tjmax = get_pkg_tjmax(pdev->id, &pdev->dev); | |
516 | else | |
517 | tdata->tjmax = get_tjmax(c, cpu, &pdev->dev); | |
518 | ||
519 | update_ttarget(c->x86_model, tdata, &pdev->dev); | |
520 | pdata->core_data[attr_no] = tdata; | |
521 | ||
522 | /* Create sysfs interfaces */ | |
523 | err = create_core_attrs(tdata, &pdev->dev, attr_no); | |
524 | if (err) | |
525 | goto exit_free; | |
bebe4678 RM |
526 | |
527 | return 0; | |
199e0de7 D |
528 | exit_free: |
529 | kfree(tdata); | |
530 | return err; | |
531 | } | |
532 | ||
533 | static void coretemp_add_core(unsigned int cpu, int pkg_flag) | |
534 | { | |
535 | struct platform_data *pdata; | |
536 | struct platform_device *pdev = coretemp_get_pdev(cpu); | |
537 | int err; | |
538 | ||
539 | if (!pdev) | |
540 | return; | |
541 | ||
542 | pdata = platform_get_drvdata(pdev); | |
543 | ||
544 | err = create_core_data(pdata, pdev, cpu, pkg_flag); | |
545 | if (err) | |
546 | dev_err(&pdev->dev, "Adding Core %u failed\n", cpu); | |
547 | } | |
548 | ||
549 | static void coretemp_remove_core(struct platform_data *pdata, | |
550 | struct device *dev, int indx) | |
551 | { | |
552 | int i; | |
553 | struct temp_data *tdata = pdata->core_data[indx]; | |
554 | ||
555 | /* Remove the sysfs attributes */ | |
556 | for (i = 0; i < MAX_ATTRS; i++) | |
557 | device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); | |
558 | ||
559 | kfree(pdata->core_data[indx]); | |
560 | pdata->core_data[indx] = NULL; | |
561 | } | |
562 | ||
563 | static int __devinit coretemp_probe(struct platform_device *pdev) | |
564 | { | |
565 | struct platform_data *pdata; | |
566 | int err; | |
bebe4678 | 567 | |
199e0de7 D |
568 | /* Check the microcode version of the CPU */ |
569 | err = chk_ucode_version(pdev); | |
570 | if (err) | |
571 | return err; | |
572 | ||
573 | /* Initialize the per-package data structures */ | |
574 | pdata = kzalloc(sizeof(struct platform_data), GFP_KERNEL); | |
575 | if (!pdata) | |
576 | return -ENOMEM; | |
577 | ||
578 | err = create_name_attr(pdata, &pdev->dev); | |
579 | if (err) | |
580 | goto exit_free; | |
581 | ||
582 | pdata->phys_proc_id = TO_PHYS_ID(pdev->id); | |
583 | platform_set_drvdata(pdev, pdata); | |
584 | ||
585 | pdata->hwmon_dev = hwmon_device_register(&pdev->dev); | |
586 | if (IS_ERR(pdata->hwmon_dev)) { | |
587 | err = PTR_ERR(pdata->hwmon_dev); | |
588 | dev_err(&pdev->dev, "Class registration failed (%d)\n", err); | |
589 | goto exit_name; | |
590 | } | |
591 | return 0; | |
592 | ||
593 | exit_name: | |
594 | device_remove_file(&pdev->dev, &pdata->name_attr); | |
595 | platform_set_drvdata(pdev, NULL); | |
bebe4678 | 596 | exit_free: |
199e0de7 | 597 | kfree(pdata); |
bebe4678 RM |
598 | return err; |
599 | } | |
600 | ||
601 | static int __devexit coretemp_remove(struct platform_device *pdev) | |
602 | { | |
199e0de7 D |
603 | struct platform_data *pdata = platform_get_drvdata(pdev); |
604 | int i; | |
bebe4678 | 605 | |
199e0de7 D |
606 | for (i = MAX_CORE_DATA - 1; i >= 0; --i) |
607 | if (pdata->core_data[i]) | |
608 | coretemp_remove_core(pdata, &pdev->dev, i); | |
609 | ||
610 | device_remove_file(&pdev->dev, &pdata->name_attr); | |
611 | hwmon_device_unregister(pdata->hwmon_dev); | |
bebe4678 | 612 | platform_set_drvdata(pdev, NULL); |
199e0de7 | 613 | kfree(pdata); |
bebe4678 RM |
614 | return 0; |
615 | } | |
616 | ||
617 | static struct platform_driver coretemp_driver = { | |
618 | .driver = { | |
619 | .owner = THIS_MODULE, | |
620 | .name = DRVNAME, | |
621 | }, | |
622 | .probe = coretemp_probe, | |
623 | .remove = __devexit_p(coretemp_remove), | |
624 | }; | |
625 | ||
bebe4678 RM |
626 | static int __cpuinit coretemp_device_add(unsigned int cpu) |
627 | { | |
628 | int err; | |
629 | struct platform_device *pdev; | |
630 | struct pdev_entry *pdev_entry; | |
d883b9f0 JD |
631 | |
632 | mutex_lock(&pdev_list_mutex); | |
633 | ||
bebe4678 RM |
634 | pdev = platform_device_alloc(DRVNAME, cpu); |
635 | if (!pdev) { | |
636 | err = -ENOMEM; | |
f8bb8925 | 637 | pr_err("Device allocation failed\n"); |
bebe4678 RM |
638 | goto exit; |
639 | } | |
640 | ||
641 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
642 | if (!pdev_entry) { | |
643 | err = -ENOMEM; | |
644 | goto exit_device_put; | |
645 | } | |
646 | ||
647 | err = platform_device_add(pdev); | |
648 | if (err) { | |
f8bb8925 | 649 | pr_err("Device addition failed (%d)\n", err); |
bebe4678 RM |
650 | goto exit_device_free; |
651 | } | |
652 | ||
653 | pdev_entry->pdev = pdev; | |
199e0de7 | 654 | pdev_entry->phys_proc_id = TO_PHYS_ID(cpu); |
199e0de7 | 655 | |
bebe4678 RM |
656 | list_add_tail(&pdev_entry->list, &pdev_list); |
657 | mutex_unlock(&pdev_list_mutex); | |
658 | ||
659 | return 0; | |
660 | ||
661 | exit_device_free: | |
662 | kfree(pdev_entry); | |
663 | exit_device_put: | |
664 | platform_device_put(pdev); | |
665 | exit: | |
d883b9f0 | 666 | mutex_unlock(&pdev_list_mutex); |
bebe4678 RM |
667 | return err; |
668 | } | |
669 | ||
199e0de7 | 670 | static void coretemp_device_remove(unsigned int cpu) |
bebe4678 | 671 | { |
199e0de7 D |
672 | struct pdev_entry *p, *n; |
673 | u16 phys_proc_id = TO_PHYS_ID(cpu); | |
e40cc4bd | 674 | |
bebe4678 | 675 | mutex_lock(&pdev_list_mutex); |
199e0de7 D |
676 | list_for_each_entry_safe(p, n, &pdev_list, list) { |
677 | if (p->phys_proc_id != phys_proc_id) | |
e40cc4bd | 678 | continue; |
e40cc4bd JB |
679 | platform_device_unregister(p->pdev); |
680 | list_del(&p->list); | |
e40cc4bd | 681 | kfree(p); |
bebe4678 RM |
682 | } |
683 | mutex_unlock(&pdev_list_mutex); | |
684 | } | |
685 | ||
199e0de7 D |
686 | static bool is_any_core_online(struct platform_data *pdata) |
687 | { | |
688 | int i; | |
689 | ||
690 | /* Find online cores, except pkgtemp data */ | |
691 | for (i = MAX_CORE_DATA - 1; i >= 0; --i) { | |
692 | if (pdata->core_data[i] && | |
693 | !pdata->core_data[i]->is_pkg_data) { | |
694 | return true; | |
695 | } | |
696 | } | |
697 | return false; | |
698 | } | |
699 | ||
700 | static void __cpuinit get_core_online(unsigned int cpu) | |
701 | { | |
702 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
703 | struct platform_device *pdev = coretemp_get_pdev(cpu); | |
704 | int err; | |
705 | ||
706 | /* | |
707 | * CPUID.06H.EAX[0] indicates whether the CPU has thermal | |
708 | * sensors. We check this bit only, all the early CPUs | |
709 | * without thermal sensors will be filtered out. | |
710 | */ | |
711 | if (!cpu_has(c, X86_FEATURE_DTS)) | |
712 | return; | |
713 | ||
714 | if (!pdev) { | |
715 | /* | |
716 | * Alright, we have DTS support. | |
717 | * We are bringing the _first_ core in this pkg | |
718 | * online. So, initialize per-pkg data structures and | |
719 | * then bring this core online. | |
720 | */ | |
721 | err = coretemp_device_add(cpu); | |
722 | if (err) | |
723 | return; | |
724 | /* | |
725 | * Check whether pkgtemp support is available. | |
726 | * If so, add interfaces for pkgtemp. | |
727 | */ | |
728 | if (cpu_has(c, X86_FEATURE_PTS)) | |
729 | coretemp_add_core(cpu, 1); | |
730 | } | |
731 | /* | |
732 | * Physical CPU device already exists. | |
733 | * So, just add interfaces for this core. | |
734 | */ | |
735 | coretemp_add_core(cpu, 0); | |
736 | } | |
737 | ||
738 | static void __cpuinit put_core_offline(unsigned int cpu) | |
739 | { | |
740 | int i, indx; | |
741 | struct platform_data *pdata; | |
742 | struct platform_device *pdev = coretemp_get_pdev(cpu); | |
743 | ||
744 | /* If the physical CPU device does not exist, just return */ | |
745 | if (!pdev) | |
746 | return; | |
747 | ||
748 | pdata = platform_get_drvdata(pdev); | |
749 | ||
750 | indx = TO_ATTR_NO(cpu); | |
751 | ||
752 | if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu) | |
753 | coretemp_remove_core(pdata, &pdev->dev, indx); | |
754 | ||
f4e0bcf0 | 755 | /* |
6777b9e4 GR |
756 | * If a HT sibling of a core is taken offline, but another HT sibling |
757 | * of the same core is still online, register the alternate sibling. | |
758 | * This ensures that exactly one set of attributes is provided as long | |
759 | * as at least one HT sibling of a core is online. | |
f4e0bcf0 | 760 | */ |
bb74e8ca | 761 | for_each_sibling(i, cpu) { |
199e0de7 D |
762 | if (i != cpu) { |
763 | get_core_online(i); | |
f4e0bcf0 GR |
764 | /* |
765 | * Display temperature sensor data for one HT sibling | |
766 | * per core only, so abort the loop after one such | |
767 | * sibling has been found. | |
768 | */ | |
199e0de7 D |
769 | break; |
770 | } | |
771 | } | |
772 | /* | |
773 | * If all cores in this pkg are offline, remove the device. | |
774 | * coretemp_device_remove calls unregister_platform_device, | |
775 | * which in turn calls coretemp_remove. This removes the | |
776 | * pkgtemp entry and does other clean ups. | |
777 | */ | |
778 | if (!is_any_core_online(pdata)) | |
779 | coretemp_device_remove(cpu); | |
780 | } | |
781 | ||
ba7c1927 | 782 | static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, |
bebe4678 RM |
783 | unsigned long action, void *hcpu) |
784 | { | |
785 | unsigned int cpu = (unsigned long) hcpu; | |
786 | ||
787 | switch (action) { | |
788 | case CPU_ONLINE: | |
561d9a96 | 789 | case CPU_DOWN_FAILED: |
199e0de7 | 790 | get_core_online(cpu); |
bebe4678 | 791 | break; |
561d9a96 | 792 | case CPU_DOWN_PREPARE: |
199e0de7 | 793 | put_core_offline(cpu); |
bebe4678 RM |
794 | break; |
795 | } | |
796 | return NOTIFY_OK; | |
797 | } | |
798 | ||
ba7c1927 | 799 | static struct notifier_block coretemp_cpu_notifier __refdata = { |
bebe4678 RM |
800 | .notifier_call = coretemp_cpu_callback, |
801 | }; | |
bebe4678 RM |
802 | |
803 | static int __init coretemp_init(void) | |
804 | { | |
805 | int i, err = -ENODEV; | |
bebe4678 | 806 | |
bebe4678 | 807 | /* quick check if we run Intel */ |
92cb7612 | 808 | if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL) |
bebe4678 RM |
809 | goto exit; |
810 | ||
811 | err = platform_driver_register(&coretemp_driver); | |
812 | if (err) | |
813 | goto exit; | |
814 | ||
a4659053 | 815 | for_each_online_cpu(i) |
199e0de7 | 816 | get_core_online(i); |
89a3fd35 JB |
817 | |
818 | #ifndef CONFIG_HOTPLUG_CPU | |
bebe4678 RM |
819 | if (list_empty(&pdev_list)) { |
820 | err = -ENODEV; | |
821 | goto exit_driver_unreg; | |
822 | } | |
89a3fd35 | 823 | #endif |
bebe4678 | 824 | |
bebe4678 | 825 | register_hotcpu_notifier(&coretemp_cpu_notifier); |
bebe4678 RM |
826 | return 0; |
827 | ||
0dca94ba | 828 | #ifndef CONFIG_HOTPLUG_CPU |
89a3fd35 | 829 | exit_driver_unreg: |
bebe4678 | 830 | platform_driver_unregister(&coretemp_driver); |
0dca94ba | 831 | #endif |
bebe4678 RM |
832 | exit: |
833 | return err; | |
834 | } | |
835 | ||
836 | static void __exit coretemp_exit(void) | |
837 | { | |
838 | struct pdev_entry *p, *n; | |
17c10d61 | 839 | |
bebe4678 | 840 | unregister_hotcpu_notifier(&coretemp_cpu_notifier); |
bebe4678 RM |
841 | mutex_lock(&pdev_list_mutex); |
842 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
843 | platform_device_unregister(p->pdev); | |
844 | list_del(&p->list); | |
845 | kfree(p); | |
846 | } | |
847 | mutex_unlock(&pdev_list_mutex); | |
848 | platform_driver_unregister(&coretemp_driver); | |
849 | } | |
850 | ||
851 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); | |
852 | MODULE_DESCRIPTION("Intel Core temperature monitor"); | |
853 | MODULE_LICENSE("GPL"); | |
854 | ||
855 | module_init(coretemp_init) | |
856 | module_exit(coretemp_exit) |