Commit | Line | Data |
---|---|---|
989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
8a25a2fd | 3 | * CPU subsystem support |
1da177e4 LT |
4 | */ |
5 | ||
024f7846 | 6 | #include <linux/kernel.h> |
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/init.h> | |
f6a57033 | 9 | #include <linux/sched.h> |
1da177e4 LT |
10 | #include <linux/cpu.h> |
11 | #include <linux/topology.h> | |
12 | #include <linux/device.h> | |
76b67ed9 | 13 | #include <linux/node.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
fad12ac8 | 15 | #include <linux/slab.h> |
9f13a1fd | 16 | #include <linux/percpu.h> |
ac212b69 | 17 | #include <linux/acpi.h> |
f86e4718 | 18 | #include <linux/of.h> |
67bad2fd | 19 | #include <linux/cpufeature.h> |
6570a9a1 | 20 | #include <linux/tick.h> |
37efa4b4 | 21 | #include <linux/pm_qos.h> |
edb93821 | 22 | #include <linux/sched/isolation.h> |
1da177e4 | 23 | |
a1bdc7aa | 24 | #include "base.h" |
1da177e4 | 25 | |
8a25a2fd | 26 | static DEFINE_PER_CPU(struct device *, cpu_sys_devices); |
ad74557a | 27 | |
ac212b69 RW |
28 | static int cpu_subsys_match(struct device *dev, struct device_driver *drv) |
29 | { | |
30 | /* ACPI style match is the only one that may succeed. */ | |
31 | if (acpi_driver_match_device(dev, drv)) | |
32 | return 1; | |
33 | ||
34 | return 0; | |
35 | } | |
36 | ||
1da177e4 | 37 | #ifdef CONFIG_HOTPLUG_CPU |
34640468 YI |
38 | static void change_cpu_under_node(struct cpu *cpu, |
39 | unsigned int from_nid, unsigned int to_nid) | |
40 | { | |
41 | int cpuid = cpu->dev.id; | |
42 | unregister_cpu_under_node(cpuid, from_nid); | |
43 | register_cpu_under_node(cpuid, to_nid); | |
44 | cpu->node_id = to_nid; | |
45 | } | |
46 | ||
eda5867b | 47 | static int cpu_subsys_online(struct device *dev) |
1da177e4 | 48 | { |
8a25a2fd | 49 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
0902a904 RW |
50 | int cpuid = dev->id; |
51 | int from_nid, to_nid; | |
6dedcca6 | 52 | int ret; |
1da177e4 | 53 | |
0902a904 | 54 | from_nid = cpu_to_node(cpuid); |
c7991b0b | 55 | if (from_nid == NUMA_NO_NODE) |
6dedcca6 | 56 | return -ENODEV; |
c7991b0b | 57 | |
33c3736e | 58 | ret = cpu_device_up(dev); |
0902a904 RW |
59 | /* |
60 | * When hot adding memory to memoryless node and enabling a cpu | |
61 | * on the node, node number of the cpu may internally change. | |
62 | */ | |
63 | to_nid = cpu_to_node(cpuid); | |
64 | if (from_nid != to_nid) | |
65 | change_cpu_under_node(cpu, from_nid, to_nid); | |
1da177e4 | 66 | |
0902a904 | 67 | return ret; |
1da177e4 LT |
68 | } |
69 | ||
0902a904 | 70 | static int cpu_subsys_offline(struct device *dev) |
1da177e4 | 71 | { |
33c3736e | 72 | return cpu_device_down(dev); |
1da177e4 | 73 | } |
1c4e2d70 | 74 | |
76b67ed9 | 75 | void unregister_cpu(struct cpu *cpu) |
1da177e4 | 76 | { |
8a25a2fd | 77 | int logical_cpu = cpu->dev.id; |
1da177e4 | 78 | |
76b67ed9 KH |
79 | unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu)); |
80 | ||
8a25a2fd | 81 | device_unregister(&cpu->dev); |
e37d05da | 82 | per_cpu(cpu_sys_devices, logical_cpu) = NULL; |
1da177e4 LT |
83 | return; |
84 | } | |
12633e80 NF |
85 | |
86 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE | |
8a25a2fd KS |
87 | static ssize_t cpu_probe_store(struct device *dev, |
88 | struct device_attribute *attr, | |
67fc233f | 89 | const char *buf, |
12633e80 NF |
90 | size_t count) |
91 | { | |
574b851e TK |
92 | ssize_t cnt; |
93 | int ret; | |
94 | ||
95 | ret = lock_device_hotplug_sysfs(); | |
96 | if (ret) | |
97 | return ret; | |
98 | ||
99 | cnt = arch_cpu_probe(buf, count); | |
100 | ||
101 | unlock_device_hotplug(); | |
102 | return cnt; | |
12633e80 NF |
103 | } |
104 | ||
8a25a2fd KS |
105 | static ssize_t cpu_release_store(struct device *dev, |
106 | struct device_attribute *attr, | |
67fc233f | 107 | const char *buf, |
12633e80 NF |
108 | size_t count) |
109 | { | |
574b851e TK |
110 | ssize_t cnt; |
111 | int ret; | |
112 | ||
113 | ret = lock_device_hotplug_sysfs(); | |
114 | if (ret) | |
115 | return ret; | |
116 | ||
117 | cnt = arch_cpu_release(buf, count); | |
118 | ||
119 | unlock_device_hotplug(); | |
120 | return cnt; | |
12633e80 NF |
121 | } |
122 | ||
8a25a2fd KS |
123 | static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store); |
124 | static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store); | |
12633e80 | 125 | #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ |
1da177e4 LT |
126 | #endif /* CONFIG_HOTPLUG_CPU */ |
127 | ||
0902a904 RW |
128 | struct bus_type cpu_subsys = { |
129 | .name = "cpu", | |
130 | .dev_name = "cpu", | |
ac212b69 | 131 | .match = cpu_subsys_match, |
0902a904 RW |
132 | #ifdef CONFIG_HOTPLUG_CPU |
133 | .online = cpu_subsys_online, | |
134 | .offline = cpu_subsys_offline, | |
135 | #endif | |
136 | }; | |
137 | EXPORT_SYMBOL_GPL(cpu_subsys); | |
138 | ||
51be5606 VG |
139 | #ifdef CONFIG_KEXEC |
140 | #include <linux/kexec.h> | |
141 | ||
948b3edb JP |
142 | static ssize_t crash_notes_show(struct device *dev, |
143 | struct device_attribute *attr, | |
4a0b2b4d | 144 | char *buf) |
51be5606 | 145 | { |
8a25a2fd | 146 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
51be5606 VG |
147 | unsigned long long addr; |
148 | int cpunum; | |
149 | ||
8a25a2fd | 150 | cpunum = cpu->dev.id; |
51be5606 VG |
151 | |
152 | /* | |
153 | * Might be reading other cpu's data based on which cpu read thread | |
154 | * has been scheduled. But cpu data (memory) is allocated once during | |
155 | * boot up and this data does not change there after. Hence this | |
156 | * operation should be safe. No locking required. | |
157 | */ | |
3b034b0d | 158 | addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum)); |
948b3edb JP |
159 | |
160 | return sysfs_emit(buf, "%llx\n", addr); | |
51be5606 | 161 | } |
948b3edb | 162 | static DEVICE_ATTR_ADMIN_RO(crash_notes); |
eca4549f | 163 | |
948b3edb | 164 | static ssize_t crash_notes_size_show(struct device *dev, |
eca4549f ZY |
165 | struct device_attribute *attr, |
166 | char *buf) | |
167 | { | |
948b3edb | 168 | return sysfs_emit(buf, "%zu\n", sizeof(note_buf_t)); |
eca4549f | 169 | } |
948b3edb | 170 | static DEVICE_ATTR_ADMIN_RO(crash_notes_size); |
c055da9f IM |
171 | |
172 | static struct attribute *crash_note_cpu_attrs[] = { | |
173 | &dev_attr_crash_notes.attr, | |
174 | &dev_attr_crash_notes_size.attr, | |
175 | NULL | |
176 | }; | |
177 | ||
5a576764 | 178 | static const struct attribute_group crash_note_cpu_attr_group = { |
c055da9f IM |
179 | .attrs = crash_note_cpu_attrs, |
180 | }; | |
181 | #endif | |
182 | ||
183 | static const struct attribute_group *common_cpu_attr_groups[] = { | |
184 | #ifdef CONFIG_KEXEC | |
185 | &crash_note_cpu_attr_group, | |
51be5606 | 186 | #endif |
c055da9f IM |
187 | NULL |
188 | }; | |
51be5606 | 189 | |
1c4e2d70 IM |
190 | static const struct attribute_group *hotplugable_cpu_attr_groups[] = { |
191 | #ifdef CONFIG_KEXEC | |
192 | &crash_note_cpu_attr_group, | |
1c4e2d70 IM |
193 | #endif |
194 | NULL | |
195 | }; | |
196 | ||
9d1fe323 MT |
197 | /* |
198 | * Print cpu online, possible, present, and system maps | |
199 | */ | |
265d2e2e AK |
200 | |
201 | struct cpu_attr { | |
8a25a2fd | 202 | struct device_attribute attr; |
848e2391 | 203 | const struct cpumask *const map; |
265d2e2e AK |
204 | }; |
205 | ||
8a25a2fd KS |
206 | static ssize_t show_cpus_attr(struct device *dev, |
207 | struct device_attribute *attr, | |
265d2e2e | 208 | char *buf) |
9d1fe323 | 209 | { |
265d2e2e | 210 | struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr); |
9d1fe323 | 211 | |
848e2391 | 212 | return cpumap_print_to_pagebuf(true, buf, ca->map); |
9d1fe323 MT |
213 | } |
214 | ||
8a25a2fd KS |
215 | #define _CPU_ATTR(name, map) \ |
216 | { __ATTR(name, 0444, show_cpus_attr, NULL), map } | |
9d1fe323 | 217 | |
8a25a2fd | 218 | /* Keep in sync with cpu_subsys_attrs */ |
265d2e2e | 219 | static struct cpu_attr cpu_attrs[] = { |
848e2391 RV |
220 | _CPU_ATTR(online, &__cpu_online_mask), |
221 | _CPU_ATTR(possible, &__cpu_possible_mask), | |
222 | _CPU_ATTR(present, &__cpu_present_mask), | |
265d2e2e | 223 | }; |
9d1fe323 | 224 | |
e057d7ae MT |
225 | /* |
226 | * Print values for NR_CPUS and offlined cpus | |
227 | */ | |
8a25a2fd KS |
228 | static ssize_t print_cpus_kernel_max(struct device *dev, |
229 | struct device_attribute *attr, char *buf) | |
e057d7ae | 230 | { |
aa838896 | 231 | return sysfs_emit(buf, "%d\n", NR_CPUS - 1); |
e057d7ae | 232 | } |
8a25a2fd | 233 | static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL); |
e057d7ae MT |
234 | |
235 | /* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */ | |
236 | unsigned int total_cpus; | |
237 | ||
8a25a2fd KS |
238 | static ssize_t print_cpus_offline(struct device *dev, |
239 | struct device_attribute *attr, char *buf) | |
e057d7ae | 240 | { |
948b3edb | 241 | int len = 0; |
e057d7ae MT |
242 | cpumask_var_t offline; |
243 | ||
244 | /* display offline cpus < nr_cpu_ids */ | |
245 | if (!alloc_cpumask_var(&offline, GFP_KERNEL)) | |
246 | return -ENOMEM; | |
cdc6e3d3 | 247 | cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask); |
948b3edb | 248 | len += sysfs_emit_at(buf, len, "%*pbl", cpumask_pr_args(offline)); |
e057d7ae MT |
249 | free_cpumask_var(offline); |
250 | ||
251 | /* display offline cpus >= nr_cpu_ids */ | |
252 | if (total_cpus && nr_cpu_ids < total_cpus) { | |
948b3edb | 253 | len += sysfs_emit_at(buf, len, ","); |
e057d7ae MT |
254 | |
255 | if (nr_cpu_ids == total_cpus-1) | |
948b3edb | 256 | len += sysfs_emit_at(buf, len, "%u", nr_cpu_ids); |
e057d7ae | 257 | else |
948b3edb JP |
258 | len += sysfs_emit_at(buf, len, "%u-%d", |
259 | nr_cpu_ids, total_cpus - 1); | |
e057d7ae MT |
260 | } |
261 | ||
948b3edb JP |
262 | len += sysfs_emit_at(buf, len, "\n"); |
263 | ||
264 | return len; | |
e057d7ae | 265 | } |
8a25a2fd | 266 | static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL); |
e057d7ae | 267 | |
59f30abe RR |
268 | static ssize_t print_cpus_isolated(struct device *dev, |
269 | struct device_attribute *attr, char *buf) | |
270 | { | |
948b3edb | 271 | int len; |
edb93821 | 272 | cpumask_var_t isolated; |
59f30abe | 273 | |
edb93821 FW |
274 | if (!alloc_cpumask_var(&isolated, GFP_KERNEL)) |
275 | return -ENOMEM; | |
276 | ||
277 | cpumask_andnot(isolated, cpu_possible_mask, | |
278 | housekeeping_cpumask(HK_FLAG_DOMAIN)); | |
948b3edb | 279 | len = sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(isolated)); |
edb93821 FW |
280 | |
281 | free_cpumask_var(isolated); | |
59f30abe | 282 | |
948b3edb | 283 | return len; |
59f30abe RR |
284 | } |
285 | static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL); | |
286 | ||
6570a9a1 RR |
287 | #ifdef CONFIG_NO_HZ_FULL |
288 | static ssize_t print_cpus_nohz_full(struct device *dev, | |
948b3edb | 289 | struct device_attribute *attr, char *buf) |
6570a9a1 | 290 | { |
aa838896 | 291 | return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask)); |
6570a9a1 RR |
292 | } |
293 | static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL); | |
294 | #endif | |
295 | ||
2885e25c GKH |
296 | static void cpu_device_release(struct device *dev) |
297 | { | |
298 | /* | |
299 | * This is an empty function to prevent the driver core from spitting a | |
300 | * warning at us. Yes, I know this is directly opposite of what the | |
301 | * documentation for the driver core and kobjects say, and the author | |
302 | * of this code has already been publically ridiculed for doing | |
303 | * something as foolish as this. However, at this point in time, it is | |
304 | * the only way to handle the issue of statically allocated cpu | |
305 | * devices. The different architectures will have their cpu device | |
306 | * code reworked to properly handle this in the near future, so this | |
307 | * function will then be changed to correctly free up the memory held | |
308 | * by the cpu device. | |
309 | * | |
310 | * Never copy this way of doing things, or you too will be made fun of | |
30a4840a | 311 | * on the linux-kernel list, you have been warned. |
2885e25c GKH |
312 | */ |
313 | } | |
314 | ||
67bad2fd AB |
315 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
316 | static ssize_t print_cpu_modalias(struct device *dev, | |
317 | struct device_attribute *attr, | |
318 | char *buf) | |
319 | { | |
948b3edb | 320 | int len = 0; |
67bad2fd AB |
321 | u32 i; |
322 | ||
948b3edb JP |
323 | len += sysfs_emit_at(buf, len, |
324 | "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:", | |
325 | CPU_FEATURE_TYPEVAL); | |
67bad2fd AB |
326 | |
327 | for (i = 0; i < MAX_CPU_FEATURES; i++) | |
328 | if (cpu_have_feature(i)) { | |
948b3edb | 329 | if (len + sizeof(",XXXX\n") >= PAGE_SIZE) { |
67bad2fd AB |
330 | WARN(1, "CPU features overflow page\n"); |
331 | break; | |
332 | } | |
948b3edb | 333 | len += sysfs_emit_at(buf, len, ",%04X", i); |
67bad2fd | 334 | } |
948b3edb JP |
335 | len += sysfs_emit_at(buf, len, "\n"); |
336 | return len; | |
67bad2fd | 337 | } |
67bad2fd AB |
338 | |
339 | static int cpu_uevent(struct device *dev, struct kobj_uevent_env *env) | |
340 | { | |
341 | char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
342 | if (buf) { | |
343 | print_cpu_modalias(NULL, NULL, buf); | |
344 | add_uevent_var(env, "MODALIAS=%s", buf); | |
345 | kfree(buf); | |
346 | } | |
347 | return 0; | |
348 | } | |
349 | #endif | |
350 | ||
1da177e4 | 351 | /* |
405ae7d3 | 352 | * register_cpu - Setup a sysfs device for a CPU. |
72486f1f SS |
353 | * @cpu - cpu->hotpluggable field set to 1 will generate a control file in |
354 | * sysfs for this CPU. | |
1da177e4 LT |
355 | * @num - CPU number to use when creating the device. |
356 | * | |
357 | * Initialize and register the CPU device. | |
358 | */ | |
a83048eb | 359 | int register_cpu(struct cpu *cpu, int num) |
1da177e4 LT |
360 | { |
361 | int error; | |
76b67ed9 | 362 | |
8a25a2fd | 363 | cpu->node_id = cpu_to_node(num); |
29bb5d4f | 364 | memset(&cpu->dev, 0x00, sizeof(struct device)); |
8a25a2fd KS |
365 | cpu->dev.id = num; |
366 | cpu->dev.bus = &cpu_subsys; | |
2885e25c | 367 | cpu->dev.release = cpu_device_release; |
0902a904 | 368 | cpu->dev.offline_disabled = !cpu->hotpluggable; |
1001b4d4 | 369 | cpu->dev.offline = !cpu_online(num); |
f86e4718 | 370 | cpu->dev.of_node = of_get_cpu_node(num, NULL); |
2b9c1f03 | 371 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
67bad2fd | 372 | cpu->dev.bus->uevent = cpu_uevent; |
fad12ac8 | 373 | #endif |
c055da9f | 374 | cpu->dev.groups = common_cpu_attr_groups; |
1c4e2d70 IM |
375 | if (cpu->hotpluggable) |
376 | cpu->dev.groups = hotplugable_cpu_attr_groups; | |
8a25a2fd | 377 | error = device_register(&cpu->dev); |
3aaba245 AY |
378 | if (error) { |
379 | put_device(&cpu->dev); | |
59fffa34 | 380 | return error; |
3aaba245 | 381 | } |
51be5606 | 382 | |
59fffa34 AS |
383 | per_cpu(cpu_sys_devices, num) = &cpu->dev; |
384 | register_cpu_under_node(num, cpu_to_node(num)); | |
0759e80b RW |
385 | dev_pm_qos_expose_latency_limit(&cpu->dev, |
386 | PM_QOS_RESUME_LATENCY_NO_CONSTRAINT); | |
59fffa34 AS |
387 | |
388 | return 0; | |
1da177e4 LT |
389 | } |
390 | ||
e7deeb9d | 391 | struct device *get_cpu_device(unsigned int cpu) |
ad74557a | 392 | { |
e37d05da MT |
393 | if (cpu < nr_cpu_ids && cpu_possible(cpu)) |
394 | return per_cpu(cpu_sys_devices, cpu); | |
ad74557a AR |
395 | else |
396 | return NULL; | |
397 | } | |
8a25a2fd KS |
398 | EXPORT_SYMBOL_GPL(get_cpu_device); |
399 | ||
3d52943b SH |
400 | static void device_create_release(struct device *dev) |
401 | { | |
402 | kfree(dev); | |
403 | } | |
404 | ||
fa548d79 | 405 | __printf(4, 0) |
3d52943b SH |
406 | static struct device * |
407 | __cpu_device_create(struct device *parent, void *drvdata, | |
408 | const struct attribute_group **groups, | |
409 | const char *fmt, va_list args) | |
410 | { | |
411 | struct device *dev = NULL; | |
6b72cf12 | 412 | int retval = -ENOMEM; |
3d52943b SH |
413 | |
414 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
6b72cf12 | 415 | if (!dev) |
3d52943b | 416 | goto error; |
3d52943b SH |
417 | |
418 | device_initialize(dev); | |
419 | dev->parent = parent; | |
420 | dev->groups = groups; | |
421 | dev->release = device_create_release; | |
85945c28 | 422 | device_set_pm_not_required(dev); |
3d52943b SH |
423 | dev_set_drvdata(dev, drvdata); |
424 | ||
425 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); | |
426 | if (retval) | |
427 | goto error; | |
428 | ||
429 | retval = device_add(dev); | |
430 | if (retval) | |
431 | goto error; | |
432 | ||
433 | return dev; | |
434 | ||
435 | error: | |
436 | put_device(dev); | |
437 | return ERR_PTR(retval); | |
438 | } | |
439 | ||
440 | struct device *cpu_device_create(struct device *parent, void *drvdata, | |
441 | const struct attribute_group **groups, | |
442 | const char *fmt, ...) | |
443 | { | |
444 | va_list vargs; | |
445 | struct device *dev; | |
446 | ||
447 | va_start(vargs, fmt); | |
448 | dev = __cpu_device_create(parent, drvdata, groups, fmt, vargs); | |
449 | va_end(vargs); | |
450 | return dev; | |
451 | } | |
452 | EXPORT_SYMBOL_GPL(cpu_device_create); | |
453 | ||
2b9c1f03 | 454 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
67bad2fd | 455 | static DEVICE_ATTR(modalias, 0444, print_cpu_modalias, NULL); |
fad12ac8 TR |
456 | #endif |
457 | ||
8a25a2fd KS |
458 | static struct attribute *cpu_root_attrs[] = { |
459 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE | |
460 | &dev_attr_probe.attr, | |
461 | &dev_attr_release.attr, | |
462 | #endif | |
463 | &cpu_attrs[0].attr.attr, | |
464 | &cpu_attrs[1].attr.attr, | |
465 | &cpu_attrs[2].attr.attr, | |
466 | &dev_attr_kernel_max.attr, | |
467 | &dev_attr_offline.attr, | |
59f30abe | 468 | &dev_attr_isolated.attr, |
6570a9a1 RR |
469 | #ifdef CONFIG_NO_HZ_FULL |
470 | &dev_attr_nohz_full.attr, | |
471 | #endif | |
2b9c1f03 | 472 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
fad12ac8 TR |
473 | &dev_attr_modalias.attr, |
474 | #endif | |
8a25a2fd KS |
475 | NULL |
476 | }; | |
477 | ||
5a576764 | 478 | static const struct attribute_group cpu_root_attr_group = { |
8a25a2fd KS |
479 | .attrs = cpu_root_attrs, |
480 | }; | |
481 | ||
482 | static const struct attribute_group *cpu_root_attr_groups[] = { | |
483 | &cpu_root_attr_group, | |
484 | NULL, | |
485 | }; | |
1da177e4 | 486 | |
e7deeb9d | 487 | bool cpu_is_hotpluggable(unsigned int cpu) |
2987557f | 488 | { |
7affca35 LT |
489 | struct device *dev = get_cpu_device(cpu); |
490 | return dev && container_of(dev, struct cpu, dev)->hotpluggable; | |
2987557f JT |
491 | } |
492 | EXPORT_SYMBOL_GPL(cpu_is_hotpluggable); | |
493 | ||
9f13a1fd BH |
494 | #ifdef CONFIG_GENERIC_CPU_DEVICES |
495 | static DEFINE_PER_CPU(struct cpu, cpu_devices); | |
496 | #endif | |
497 | ||
498 | static void __init cpu_dev_register_generic(void) | |
499 | { | |
500 | #ifdef CONFIG_GENERIC_CPU_DEVICES | |
501 | int i; | |
502 | ||
503 | for_each_possible_cpu(i) { | |
504 | if (register_cpu(&per_cpu(cpu_devices, i), i)) | |
505 | panic("Failed to register CPU device"); | |
506 | } | |
507 | #endif | |
508 | } | |
509 | ||
87590ce6 TG |
510 | #ifdef CONFIG_GENERIC_CPU_VULNERABILITIES |
511 | ||
512 | ssize_t __weak cpu_show_meltdown(struct device *dev, | |
513 | struct device_attribute *attr, char *buf) | |
514 | { | |
aa838896 | 515 | return sysfs_emit(buf, "Not affected\n"); |
87590ce6 TG |
516 | } |
517 | ||
518 | ssize_t __weak cpu_show_spectre_v1(struct device *dev, | |
519 | struct device_attribute *attr, char *buf) | |
520 | { | |
aa838896 | 521 | return sysfs_emit(buf, "Not affected\n"); |
87590ce6 TG |
522 | } |
523 | ||
524 | ssize_t __weak cpu_show_spectre_v2(struct device *dev, | |
525 | struct device_attribute *attr, char *buf) | |
526 | { | |
aa838896 | 527 | return sysfs_emit(buf, "Not affected\n"); |
87590ce6 TG |
528 | } |
529 | ||
c456442c KRW |
530 | ssize_t __weak cpu_show_spec_store_bypass(struct device *dev, |
531 | struct device_attribute *attr, char *buf) | |
532 | { | |
aa838896 | 533 | return sysfs_emit(buf, "Not affected\n"); |
c456442c KRW |
534 | } |
535 | ||
17dbca11 AK |
536 | ssize_t __weak cpu_show_l1tf(struct device *dev, |
537 | struct device_attribute *attr, char *buf) | |
538 | { | |
aa838896 | 539 | return sysfs_emit(buf, "Not affected\n"); |
17dbca11 AK |
540 | } |
541 | ||
8a4b06d3 TG |
542 | ssize_t __weak cpu_show_mds(struct device *dev, |
543 | struct device_attribute *attr, char *buf) | |
544 | { | |
aa838896 | 545 | return sysfs_emit(buf, "Not affected\n"); |
8a4b06d3 TG |
546 | } |
547 | ||
6608b45a PG |
548 | ssize_t __weak cpu_show_tsx_async_abort(struct device *dev, |
549 | struct device_attribute *attr, | |
550 | char *buf) | |
551 | { | |
aa838896 | 552 | return sysfs_emit(buf, "Not affected\n"); |
6608b45a PG |
553 | } |
554 | ||
db4d30fb | 555 | ssize_t __weak cpu_show_itlb_multihit(struct device *dev, |
948b3edb | 556 | struct device_attribute *attr, char *buf) |
db4d30fb | 557 | { |
aa838896 | 558 | return sysfs_emit(buf, "Not affected\n"); |
db4d30fb VT |
559 | } |
560 | ||
7e5b3c26 MG |
561 | ssize_t __weak cpu_show_srbds(struct device *dev, |
562 | struct device_attribute *attr, char *buf) | |
563 | { | |
aa838896 | 564 | return sysfs_emit(buf, "Not affected\n"); |
7e5b3c26 MG |
565 | } |
566 | ||
87590ce6 TG |
567 | static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL); |
568 | static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL); | |
569 | static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL); | |
c456442c | 570 | static DEVICE_ATTR(spec_store_bypass, 0444, cpu_show_spec_store_bypass, NULL); |
17dbca11 | 571 | static DEVICE_ATTR(l1tf, 0444, cpu_show_l1tf, NULL); |
8a4b06d3 | 572 | static DEVICE_ATTR(mds, 0444, cpu_show_mds, NULL); |
6608b45a | 573 | static DEVICE_ATTR(tsx_async_abort, 0444, cpu_show_tsx_async_abort, NULL); |
db4d30fb | 574 | static DEVICE_ATTR(itlb_multihit, 0444, cpu_show_itlb_multihit, NULL); |
7e5b3c26 | 575 | static DEVICE_ATTR(srbds, 0444, cpu_show_srbds, NULL); |
87590ce6 TG |
576 | |
577 | static struct attribute *cpu_root_vulnerabilities_attrs[] = { | |
578 | &dev_attr_meltdown.attr, | |
579 | &dev_attr_spectre_v1.attr, | |
580 | &dev_attr_spectre_v2.attr, | |
c456442c | 581 | &dev_attr_spec_store_bypass.attr, |
17dbca11 | 582 | &dev_attr_l1tf.attr, |
8a4b06d3 | 583 | &dev_attr_mds.attr, |
6608b45a | 584 | &dev_attr_tsx_async_abort.attr, |
db4d30fb | 585 | &dev_attr_itlb_multihit.attr, |
7e5b3c26 | 586 | &dev_attr_srbds.attr, |
87590ce6 TG |
587 | NULL |
588 | }; | |
589 | ||
590 | static const struct attribute_group cpu_root_vulnerabilities_group = { | |
591 | .name = "vulnerabilities", | |
592 | .attrs = cpu_root_vulnerabilities_attrs, | |
593 | }; | |
594 | ||
595 | static void __init cpu_register_vulnerabilities(void) | |
596 | { | |
597 | if (sysfs_create_group(&cpu_subsys.dev_root->kobj, | |
598 | &cpu_root_vulnerabilities_group)) | |
599 | pr_err("Unable to register CPU vulnerabilities\n"); | |
600 | } | |
601 | ||
602 | #else | |
603 | static inline void cpu_register_vulnerabilities(void) { } | |
604 | #endif | |
605 | ||
024f7846 | 606 | void __init cpu_dev_init(void) |
1da177e4 | 607 | { |
024f7846 BH |
608 | if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups)) |
609 | panic("Failed to register CPU subsystem"); | |
8a25a2fd | 610 | |
9f13a1fd | 611 | cpu_dev_register_generic(); |
87590ce6 | 612 | cpu_register_vulnerabilities(); |
1da177e4 | 613 | } |