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> |
1fd7ab3f | 22 | #include <linux/delay.h> |
edb93821 | 23 | #include <linux/sched/isolation.h> |
1da177e4 | 24 | |
a1bdc7aa | 25 | #include "base.h" |
1da177e4 | 26 | |
8a25a2fd | 27 | static DEFINE_PER_CPU(struct device *, cpu_sys_devices); |
ad74557a | 28 | |
ac212b69 RW |
29 | static int cpu_subsys_match(struct device *dev, struct device_driver *drv) |
30 | { | |
31 | /* ACPI style match is the only one that may succeed. */ | |
32 | if (acpi_driver_match_device(dev, drv)) | |
33 | return 1; | |
34 | ||
35 | return 0; | |
36 | } | |
37 | ||
1da177e4 | 38 | #ifdef CONFIG_HOTPLUG_CPU |
34640468 YI |
39 | static void change_cpu_under_node(struct cpu *cpu, |
40 | unsigned int from_nid, unsigned int to_nid) | |
41 | { | |
42 | int cpuid = cpu->dev.id; | |
43 | unregister_cpu_under_node(cpuid, from_nid); | |
44 | register_cpu_under_node(cpuid, to_nid); | |
45 | cpu->node_id = to_nid; | |
46 | } | |
47 | ||
eda5867b | 48 | static int cpu_subsys_online(struct device *dev) |
1da177e4 | 49 | { |
8a25a2fd | 50 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
0902a904 RW |
51 | int cpuid = dev->id; |
52 | int from_nid, to_nid; | |
6dedcca6 | 53 | int ret; |
1fd7ab3f | 54 | int retries = 0; |
1da177e4 | 55 | |
0902a904 | 56 | from_nid = cpu_to_node(cpuid); |
c7991b0b | 57 | if (from_nid == NUMA_NO_NODE) |
6dedcca6 | 58 | return -ENODEV; |
c7991b0b | 59 | |
1fd7ab3f | 60 | retry: |
33c3736e | 61 | ret = cpu_device_up(dev); |
1fd7ab3f WL |
62 | |
63 | /* | |
64 | * If -EBUSY is returned, it is likely that hotplug is temporarily | |
65 | * disabled when cpu_hotplug_disable() was called. This condition is | |
66 | * transient. So we retry after waiting for an exponentially | |
67 | * increasing delay up to a total of at least 620ms as some PCI | |
68 | * device initialization can take quite a while. | |
69 | */ | |
70 | if (ret == -EBUSY) { | |
71 | retries++; | |
72 | if (retries > 5) | |
73 | return ret; | |
74 | msleep(10 * (1 << retries)); | |
75 | goto retry; | |
76 | } | |
77 | ||
0902a904 RW |
78 | /* |
79 | * When hot adding memory to memoryless node and enabling a cpu | |
80 | * on the node, node number of the cpu may internally change. | |
81 | */ | |
82 | to_nid = cpu_to_node(cpuid); | |
83 | if (from_nid != to_nid) | |
84 | change_cpu_under_node(cpu, from_nid, to_nid); | |
1da177e4 | 85 | |
0902a904 | 86 | return ret; |
1da177e4 LT |
87 | } |
88 | ||
0902a904 | 89 | static int cpu_subsys_offline(struct device *dev) |
1da177e4 | 90 | { |
33c3736e | 91 | return cpu_device_down(dev); |
1da177e4 | 92 | } |
1c4e2d70 | 93 | |
76b67ed9 | 94 | void unregister_cpu(struct cpu *cpu) |
1da177e4 | 95 | { |
8a25a2fd | 96 | int logical_cpu = cpu->dev.id; |
1da177e4 | 97 | |
76b67ed9 KH |
98 | unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu)); |
99 | ||
8a25a2fd | 100 | device_unregister(&cpu->dev); |
e37d05da | 101 | per_cpu(cpu_sys_devices, logical_cpu) = NULL; |
1da177e4 LT |
102 | return; |
103 | } | |
12633e80 NF |
104 | |
105 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE | |
8a25a2fd KS |
106 | static ssize_t cpu_probe_store(struct device *dev, |
107 | struct device_attribute *attr, | |
67fc233f | 108 | const char *buf, |
12633e80 NF |
109 | size_t count) |
110 | { | |
574b851e TK |
111 | ssize_t cnt; |
112 | int ret; | |
113 | ||
114 | ret = lock_device_hotplug_sysfs(); | |
115 | if (ret) | |
116 | return ret; | |
117 | ||
118 | cnt = arch_cpu_probe(buf, count); | |
119 | ||
120 | unlock_device_hotplug(); | |
121 | return cnt; | |
12633e80 NF |
122 | } |
123 | ||
8a25a2fd KS |
124 | static ssize_t cpu_release_store(struct device *dev, |
125 | struct device_attribute *attr, | |
67fc233f | 126 | const char *buf, |
12633e80 NF |
127 | size_t count) |
128 | { | |
574b851e TK |
129 | ssize_t cnt; |
130 | int ret; | |
131 | ||
132 | ret = lock_device_hotplug_sysfs(); | |
133 | if (ret) | |
134 | return ret; | |
135 | ||
136 | cnt = arch_cpu_release(buf, count); | |
137 | ||
138 | unlock_device_hotplug(); | |
139 | return cnt; | |
12633e80 NF |
140 | } |
141 | ||
8a25a2fd KS |
142 | static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store); |
143 | static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store); | |
12633e80 | 144 | #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ |
1da177e4 LT |
145 | #endif /* CONFIG_HOTPLUG_CPU */ |
146 | ||
51be5606 VG |
147 | #ifdef CONFIG_KEXEC |
148 | #include <linux/kexec.h> | |
149 | ||
948b3edb JP |
150 | static ssize_t crash_notes_show(struct device *dev, |
151 | struct device_attribute *attr, | |
4a0b2b4d | 152 | char *buf) |
51be5606 | 153 | { |
8a25a2fd | 154 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
51be5606 VG |
155 | unsigned long long addr; |
156 | int cpunum; | |
157 | ||
8a25a2fd | 158 | cpunum = cpu->dev.id; |
51be5606 VG |
159 | |
160 | /* | |
161 | * Might be reading other cpu's data based on which cpu read thread | |
162 | * has been scheduled. But cpu data (memory) is allocated once during | |
163 | * boot up and this data does not change there after. Hence this | |
164 | * operation should be safe. No locking required. | |
165 | */ | |
3b034b0d | 166 | addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum)); |
948b3edb JP |
167 | |
168 | return sysfs_emit(buf, "%llx\n", addr); | |
51be5606 | 169 | } |
948b3edb | 170 | static DEVICE_ATTR_ADMIN_RO(crash_notes); |
eca4549f | 171 | |
948b3edb | 172 | static ssize_t crash_notes_size_show(struct device *dev, |
eca4549f ZY |
173 | struct device_attribute *attr, |
174 | char *buf) | |
175 | { | |
948b3edb | 176 | return sysfs_emit(buf, "%zu\n", sizeof(note_buf_t)); |
eca4549f | 177 | } |
948b3edb | 178 | static DEVICE_ATTR_ADMIN_RO(crash_notes_size); |
c055da9f IM |
179 | |
180 | static struct attribute *crash_note_cpu_attrs[] = { | |
181 | &dev_attr_crash_notes.attr, | |
182 | &dev_attr_crash_notes_size.attr, | |
183 | NULL | |
184 | }; | |
185 | ||
5a576764 | 186 | static const struct attribute_group crash_note_cpu_attr_group = { |
c055da9f IM |
187 | .attrs = crash_note_cpu_attrs, |
188 | }; | |
189 | #endif | |
190 | ||
191 | static const struct attribute_group *common_cpu_attr_groups[] = { | |
192 | #ifdef CONFIG_KEXEC | |
193 | &crash_note_cpu_attr_group, | |
51be5606 | 194 | #endif |
c055da9f IM |
195 | NULL |
196 | }; | |
51be5606 | 197 | |
1c4e2d70 IM |
198 | static const struct attribute_group *hotplugable_cpu_attr_groups[] = { |
199 | #ifdef CONFIG_KEXEC | |
200 | &crash_note_cpu_attr_group, | |
1c4e2d70 IM |
201 | #endif |
202 | NULL | |
203 | }; | |
204 | ||
9d1fe323 MT |
205 | /* |
206 | * Print cpu online, possible, present, and system maps | |
207 | */ | |
265d2e2e AK |
208 | |
209 | struct cpu_attr { | |
8a25a2fd | 210 | struct device_attribute attr; |
848e2391 | 211 | const struct cpumask *const map; |
265d2e2e AK |
212 | }; |
213 | ||
8a25a2fd KS |
214 | static ssize_t show_cpus_attr(struct device *dev, |
215 | struct device_attribute *attr, | |
265d2e2e | 216 | char *buf) |
9d1fe323 | 217 | { |
265d2e2e | 218 | struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr); |
9d1fe323 | 219 | |
848e2391 | 220 | return cpumap_print_to_pagebuf(true, buf, ca->map); |
9d1fe323 MT |
221 | } |
222 | ||
8a25a2fd KS |
223 | #define _CPU_ATTR(name, map) \ |
224 | { __ATTR(name, 0444, show_cpus_attr, NULL), map } | |
9d1fe323 | 225 | |
8a25a2fd | 226 | /* Keep in sync with cpu_subsys_attrs */ |
265d2e2e | 227 | static struct cpu_attr cpu_attrs[] = { |
848e2391 RV |
228 | _CPU_ATTR(online, &__cpu_online_mask), |
229 | _CPU_ATTR(possible, &__cpu_possible_mask), | |
230 | _CPU_ATTR(present, &__cpu_present_mask), | |
265d2e2e | 231 | }; |
9d1fe323 | 232 | |
e057d7ae MT |
233 | /* |
234 | * Print values for NR_CPUS and offlined cpus | |
235 | */ | |
8a25a2fd KS |
236 | static ssize_t print_cpus_kernel_max(struct device *dev, |
237 | struct device_attribute *attr, char *buf) | |
e057d7ae | 238 | { |
aa838896 | 239 | return sysfs_emit(buf, "%d\n", NR_CPUS - 1); |
e057d7ae | 240 | } |
8a25a2fd | 241 | static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL); |
e057d7ae MT |
242 | |
243 | /* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */ | |
244 | unsigned int total_cpus; | |
245 | ||
8a25a2fd KS |
246 | static ssize_t print_cpus_offline(struct device *dev, |
247 | struct device_attribute *attr, char *buf) | |
e057d7ae | 248 | { |
948b3edb | 249 | int len = 0; |
e057d7ae MT |
250 | cpumask_var_t offline; |
251 | ||
252 | /* display offline cpus < nr_cpu_ids */ | |
253 | if (!alloc_cpumask_var(&offline, GFP_KERNEL)) | |
254 | return -ENOMEM; | |
cdc6e3d3 | 255 | cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask); |
948b3edb | 256 | len += sysfs_emit_at(buf, len, "%*pbl", cpumask_pr_args(offline)); |
e057d7ae MT |
257 | free_cpumask_var(offline); |
258 | ||
259 | /* display offline cpus >= nr_cpu_ids */ | |
260 | if (total_cpus && nr_cpu_ids < total_cpus) { | |
948b3edb | 261 | len += sysfs_emit_at(buf, len, ","); |
e057d7ae MT |
262 | |
263 | if (nr_cpu_ids == total_cpus-1) | |
948b3edb | 264 | len += sysfs_emit_at(buf, len, "%u", nr_cpu_ids); |
e057d7ae | 265 | else |
948b3edb JP |
266 | len += sysfs_emit_at(buf, len, "%u-%d", |
267 | nr_cpu_ids, total_cpus - 1); | |
e057d7ae MT |
268 | } |
269 | ||
948b3edb JP |
270 | len += sysfs_emit_at(buf, len, "\n"); |
271 | ||
272 | return len; | |
e057d7ae | 273 | } |
8a25a2fd | 274 | static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL); |
e057d7ae | 275 | |
59f30abe RR |
276 | static ssize_t print_cpus_isolated(struct device *dev, |
277 | struct device_attribute *attr, char *buf) | |
278 | { | |
948b3edb | 279 | int len; |
edb93821 | 280 | cpumask_var_t isolated; |
59f30abe | 281 | |
edb93821 FW |
282 | if (!alloc_cpumask_var(&isolated, GFP_KERNEL)) |
283 | return -ENOMEM; | |
284 | ||
285 | cpumask_andnot(isolated, cpu_possible_mask, | |
04d4e665 | 286 | housekeeping_cpumask(HK_TYPE_DOMAIN)); |
948b3edb | 287 | len = sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(isolated)); |
edb93821 FW |
288 | |
289 | free_cpumask_var(isolated); | |
59f30abe | 290 | |
948b3edb | 291 | return len; |
59f30abe RR |
292 | } |
293 | static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL); | |
294 | ||
6570a9a1 RR |
295 | #ifdef CONFIG_NO_HZ_FULL |
296 | static ssize_t print_cpus_nohz_full(struct device *dev, | |
948b3edb | 297 | struct device_attribute *attr, char *buf) |
6570a9a1 | 298 | { |
aa838896 | 299 | return sysfs_emit(buf, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask)); |
6570a9a1 RR |
300 | } |
301 | static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL); | |
302 | #endif | |
303 | ||
88a6f899 ED |
304 | #ifdef CONFIG_CRASH_HOTPLUG |
305 | static ssize_t crash_hotplug_show(struct device *dev, | |
306 | struct device_attribute *attr, | |
307 | char *buf) | |
308 | { | |
309 | return sysfs_emit(buf, "%d\n", crash_hotplug_cpu_support()); | |
310 | } | |
311 | static DEVICE_ATTR_ADMIN_RO(crash_hotplug); | |
312 | #endif | |
313 | ||
2885e25c GKH |
314 | static void cpu_device_release(struct device *dev) |
315 | { | |
316 | /* | |
317 | * This is an empty function to prevent the driver core from spitting a | |
318 | * warning at us. Yes, I know this is directly opposite of what the | |
319 | * documentation for the driver core and kobjects say, and the author | |
320 | * of this code has already been publically ridiculed for doing | |
321 | * something as foolish as this. However, at this point in time, it is | |
322 | * the only way to handle the issue of statically allocated cpu | |
323 | * devices. The different architectures will have their cpu device | |
324 | * code reworked to properly handle this in the near future, so this | |
325 | * function will then be changed to correctly free up the memory held | |
326 | * by the cpu device. | |
327 | * | |
328 | * Never copy this way of doing things, or you too will be made fun of | |
30a4840a | 329 | * on the linux-kernel list, you have been warned. |
2885e25c GKH |
330 | */ |
331 | } | |
332 | ||
67bad2fd AB |
333 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
334 | static ssize_t print_cpu_modalias(struct device *dev, | |
335 | struct device_attribute *attr, | |
336 | char *buf) | |
337 | { | |
948b3edb | 338 | int len = 0; |
67bad2fd AB |
339 | u32 i; |
340 | ||
948b3edb JP |
341 | len += sysfs_emit_at(buf, len, |
342 | "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:", | |
343 | CPU_FEATURE_TYPEVAL); | |
67bad2fd AB |
344 | |
345 | for (i = 0; i < MAX_CPU_FEATURES; i++) | |
346 | if (cpu_have_feature(i)) { | |
948b3edb | 347 | if (len + sizeof(",XXXX\n") >= PAGE_SIZE) { |
67bad2fd AB |
348 | WARN(1, "CPU features overflow page\n"); |
349 | break; | |
350 | } | |
948b3edb | 351 | len += sysfs_emit_at(buf, len, ",%04X", i); |
67bad2fd | 352 | } |
948b3edb JP |
353 | len += sysfs_emit_at(buf, len, "\n"); |
354 | return len; | |
67bad2fd | 355 | } |
67bad2fd | 356 | |
2a81ada3 | 357 | static int cpu_uevent(const struct device *dev, struct kobj_uevent_env *env) |
67bad2fd AB |
358 | { |
359 | char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL); | |
360 | if (buf) { | |
361 | print_cpu_modalias(NULL, NULL, buf); | |
362 | add_uevent_var(env, "MODALIAS=%s", buf); | |
363 | kfree(buf); | |
364 | } | |
365 | return 0; | |
366 | } | |
367 | #endif | |
368 | ||
2bc19066 GKH |
369 | struct bus_type cpu_subsys = { |
370 | .name = "cpu", | |
371 | .dev_name = "cpu", | |
372 | .match = cpu_subsys_match, | |
373 | #ifdef CONFIG_HOTPLUG_CPU | |
374 | .online = cpu_subsys_online, | |
375 | .offline = cpu_subsys_offline, | |
376 | #endif | |
377 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE | |
378 | .uevent = cpu_uevent, | |
379 | #endif | |
380 | }; | |
381 | EXPORT_SYMBOL_GPL(cpu_subsys); | |
382 | ||
1da177e4 | 383 | /* |
405ae7d3 | 384 | * register_cpu - Setup a sysfs device for a CPU. |
72486f1f SS |
385 | * @cpu - cpu->hotpluggable field set to 1 will generate a control file in |
386 | * sysfs for this CPU. | |
1da177e4 LT |
387 | * @num - CPU number to use when creating the device. |
388 | * | |
389 | * Initialize and register the CPU device. | |
390 | */ | |
a83048eb | 391 | int register_cpu(struct cpu *cpu, int num) |
1da177e4 LT |
392 | { |
393 | int error; | |
76b67ed9 | 394 | |
8a25a2fd | 395 | cpu->node_id = cpu_to_node(num); |
29bb5d4f | 396 | memset(&cpu->dev, 0x00, sizeof(struct device)); |
8a25a2fd KS |
397 | cpu->dev.id = num; |
398 | cpu->dev.bus = &cpu_subsys; | |
2885e25c | 399 | cpu->dev.release = cpu_device_release; |
0902a904 | 400 | cpu->dev.offline_disabled = !cpu->hotpluggable; |
1001b4d4 | 401 | cpu->dev.offline = !cpu_online(num); |
f86e4718 | 402 | cpu->dev.of_node = of_get_cpu_node(num, NULL); |
c055da9f | 403 | cpu->dev.groups = common_cpu_attr_groups; |
1c4e2d70 IM |
404 | if (cpu->hotpluggable) |
405 | cpu->dev.groups = hotplugable_cpu_attr_groups; | |
8a25a2fd | 406 | error = device_register(&cpu->dev); |
3aaba245 AY |
407 | if (error) { |
408 | put_device(&cpu->dev); | |
59fffa34 | 409 | return error; |
3aaba245 | 410 | } |
51be5606 | 411 | |
59fffa34 AS |
412 | per_cpu(cpu_sys_devices, num) = &cpu->dev; |
413 | register_cpu_under_node(num, cpu_to_node(num)); | |
0759e80b RW |
414 | dev_pm_qos_expose_latency_limit(&cpu->dev, |
415 | PM_QOS_RESUME_LATENCY_NO_CONSTRAINT); | |
59fffa34 AS |
416 | |
417 | return 0; | |
1da177e4 LT |
418 | } |
419 | ||
e7deeb9d | 420 | struct device *get_cpu_device(unsigned int cpu) |
ad74557a | 421 | { |
e37d05da MT |
422 | if (cpu < nr_cpu_ids && cpu_possible(cpu)) |
423 | return per_cpu(cpu_sys_devices, cpu); | |
ad74557a AR |
424 | else |
425 | return NULL; | |
426 | } | |
8a25a2fd KS |
427 | EXPORT_SYMBOL_GPL(get_cpu_device); |
428 | ||
3d52943b SH |
429 | static void device_create_release(struct device *dev) |
430 | { | |
431 | kfree(dev); | |
432 | } | |
433 | ||
fa548d79 | 434 | __printf(4, 0) |
3d52943b SH |
435 | static struct device * |
436 | __cpu_device_create(struct device *parent, void *drvdata, | |
437 | const struct attribute_group **groups, | |
438 | const char *fmt, va_list args) | |
439 | { | |
440 | struct device *dev = NULL; | |
6b72cf12 | 441 | int retval = -ENOMEM; |
3d52943b SH |
442 | |
443 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
6b72cf12 | 444 | if (!dev) |
3d52943b | 445 | goto error; |
3d52943b SH |
446 | |
447 | device_initialize(dev); | |
448 | dev->parent = parent; | |
449 | dev->groups = groups; | |
450 | dev->release = device_create_release; | |
85945c28 | 451 | device_set_pm_not_required(dev); |
3d52943b SH |
452 | dev_set_drvdata(dev, drvdata); |
453 | ||
454 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); | |
455 | if (retval) | |
456 | goto error; | |
457 | ||
458 | retval = device_add(dev); | |
459 | if (retval) | |
460 | goto error; | |
461 | ||
462 | return dev; | |
463 | ||
464 | error: | |
465 | put_device(dev); | |
466 | return ERR_PTR(retval); | |
467 | } | |
468 | ||
469 | struct device *cpu_device_create(struct device *parent, void *drvdata, | |
470 | const struct attribute_group **groups, | |
471 | const char *fmt, ...) | |
472 | { | |
473 | va_list vargs; | |
474 | struct device *dev; | |
475 | ||
476 | va_start(vargs, fmt); | |
477 | dev = __cpu_device_create(parent, drvdata, groups, fmt, vargs); | |
478 | va_end(vargs); | |
479 | return dev; | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(cpu_device_create); | |
482 | ||
2b9c1f03 | 483 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
67bad2fd | 484 | static DEVICE_ATTR(modalias, 0444, print_cpu_modalias, NULL); |
fad12ac8 TR |
485 | #endif |
486 | ||
8a25a2fd KS |
487 | static struct attribute *cpu_root_attrs[] = { |
488 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE | |
489 | &dev_attr_probe.attr, | |
490 | &dev_attr_release.attr, | |
491 | #endif | |
492 | &cpu_attrs[0].attr.attr, | |
493 | &cpu_attrs[1].attr.attr, | |
494 | &cpu_attrs[2].attr.attr, | |
495 | &dev_attr_kernel_max.attr, | |
496 | &dev_attr_offline.attr, | |
59f30abe | 497 | &dev_attr_isolated.attr, |
6570a9a1 RR |
498 | #ifdef CONFIG_NO_HZ_FULL |
499 | &dev_attr_nohz_full.attr, | |
500 | #endif | |
88a6f899 ED |
501 | #ifdef CONFIG_CRASH_HOTPLUG |
502 | &dev_attr_crash_hotplug.attr, | |
503 | #endif | |
2b9c1f03 | 504 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
fad12ac8 TR |
505 | &dev_attr_modalias.attr, |
506 | #endif | |
8a25a2fd KS |
507 | NULL |
508 | }; | |
509 | ||
5a576764 | 510 | static const struct attribute_group cpu_root_attr_group = { |
8a25a2fd KS |
511 | .attrs = cpu_root_attrs, |
512 | }; | |
513 | ||
514 | static const struct attribute_group *cpu_root_attr_groups[] = { | |
515 | &cpu_root_attr_group, | |
516 | NULL, | |
517 | }; | |
1da177e4 | 518 | |
e7deeb9d | 519 | bool cpu_is_hotpluggable(unsigned int cpu) |
2987557f | 520 | { |
7affca35 | 521 | struct device *dev = get_cpu_device(cpu); |
58d76682 JFG |
522 | return dev && container_of(dev, struct cpu, dev)->hotpluggable |
523 | && tick_nohz_cpu_hotpluggable(cpu); | |
2987557f JT |
524 | } |
525 | EXPORT_SYMBOL_GPL(cpu_is_hotpluggable); | |
526 | ||
9f13a1fd BH |
527 | #ifdef CONFIG_GENERIC_CPU_DEVICES |
528 | static DEFINE_PER_CPU(struct cpu, cpu_devices); | |
529 | #endif | |
530 | ||
531 | static void __init cpu_dev_register_generic(void) | |
532 | { | |
533 | #ifdef CONFIG_GENERIC_CPU_DEVICES | |
534 | int i; | |
535 | ||
536 | for_each_possible_cpu(i) { | |
537 | if (register_cpu(&per_cpu(cpu_devices, i), i)) | |
538 | panic("Failed to register CPU device"); | |
539 | } | |
540 | #endif | |
541 | } | |
542 | ||
87590ce6 | 543 | #ifdef CONFIG_GENERIC_CPU_VULNERABILITIES |
6524c798 | 544 | static ssize_t cpu_show_not_affected(struct device *dev, |
7e5b3c26 MG |
545 | struct device_attribute *attr, char *buf) |
546 | { | |
aa838896 | 547 | return sysfs_emit(buf, "Not affected\n"); |
7e5b3c26 MG |
548 | } |
549 | ||
0fddfe33 BPA |
550 | #define CPU_SHOW_VULN_FALLBACK(func) \ |
551 | ssize_t cpu_show_##func(struct device *, \ | |
552 | struct device_attribute *, char *) \ | |
553 | __attribute__((weak, alias("cpu_show_not_affected"))) | |
554 | ||
555 | CPU_SHOW_VULN_FALLBACK(meltdown); | |
556 | CPU_SHOW_VULN_FALLBACK(spectre_v1); | |
557 | CPU_SHOW_VULN_FALLBACK(spectre_v2); | |
558 | CPU_SHOW_VULN_FALLBACK(spec_store_bypass); | |
559 | CPU_SHOW_VULN_FALLBACK(l1tf); | |
560 | CPU_SHOW_VULN_FALLBACK(mds); | |
561 | CPU_SHOW_VULN_FALLBACK(tsx_async_abort); | |
562 | CPU_SHOW_VULN_FALLBACK(itlb_multihit); | |
563 | CPU_SHOW_VULN_FALLBACK(srbds); | |
564 | CPU_SHOW_VULN_FALLBACK(mmio_stale_data); | |
565 | CPU_SHOW_VULN_FALLBACK(retbleed); | |
566 | CPU_SHOW_VULN_FALLBACK(spec_rstack_overflow); | |
3477144c | 567 | CPU_SHOW_VULN_FALLBACK(gds); |
fb3bd914 | 568 | |
87590ce6 TG |
569 | static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL); |
570 | static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL); | |
571 | static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL); | |
c456442c | 572 | static DEVICE_ATTR(spec_store_bypass, 0444, cpu_show_spec_store_bypass, NULL); |
17dbca11 | 573 | static DEVICE_ATTR(l1tf, 0444, cpu_show_l1tf, NULL); |
8a4b06d3 | 574 | static DEVICE_ATTR(mds, 0444, cpu_show_mds, NULL); |
6608b45a | 575 | static DEVICE_ATTR(tsx_async_abort, 0444, cpu_show_tsx_async_abort, NULL); |
db4d30fb | 576 | static DEVICE_ATTR(itlb_multihit, 0444, cpu_show_itlb_multihit, NULL); |
7e5b3c26 | 577 | static DEVICE_ATTR(srbds, 0444, cpu_show_srbds, NULL); |
8d50cdf8 | 578 | static DEVICE_ATTR(mmio_stale_data, 0444, cpu_show_mmio_stale_data, NULL); |
6b80b59b | 579 | static DEVICE_ATTR(retbleed, 0444, cpu_show_retbleed, NULL); |
fb3bd914 | 580 | static DEVICE_ATTR(spec_rstack_overflow, 0444, cpu_show_spec_rstack_overflow, NULL); |
3477144c | 581 | static DEVICE_ATTR(gather_data_sampling, 0444, cpu_show_gds, NULL); |
87590ce6 TG |
582 | |
583 | static struct attribute *cpu_root_vulnerabilities_attrs[] = { | |
584 | &dev_attr_meltdown.attr, | |
585 | &dev_attr_spectre_v1.attr, | |
586 | &dev_attr_spectre_v2.attr, | |
c456442c | 587 | &dev_attr_spec_store_bypass.attr, |
17dbca11 | 588 | &dev_attr_l1tf.attr, |
8a4b06d3 | 589 | &dev_attr_mds.attr, |
6608b45a | 590 | &dev_attr_tsx_async_abort.attr, |
db4d30fb | 591 | &dev_attr_itlb_multihit.attr, |
7e5b3c26 | 592 | &dev_attr_srbds.attr, |
8d50cdf8 | 593 | &dev_attr_mmio_stale_data.attr, |
6b80b59b | 594 | &dev_attr_retbleed.attr, |
fb3bd914 | 595 | &dev_attr_spec_rstack_overflow.attr, |
8974eb58 | 596 | &dev_attr_gather_data_sampling.attr, |
87590ce6 TG |
597 | NULL |
598 | }; | |
599 | ||
600 | static const struct attribute_group cpu_root_vulnerabilities_group = { | |
601 | .name = "vulnerabilities", | |
602 | .attrs = cpu_root_vulnerabilities_attrs, | |
603 | }; | |
604 | ||
605 | static void __init cpu_register_vulnerabilities(void) | |
606 | { | |
8c99377e GKH |
607 | struct device *dev = bus_get_dev_root(&cpu_subsys); |
608 | ||
609 | if (dev) { | |
610 | if (sysfs_create_group(&dev->kobj, &cpu_root_vulnerabilities_group)) | |
611 | pr_err("Unable to register CPU vulnerabilities\n"); | |
612 | put_device(dev); | |
613 | } | |
87590ce6 TG |
614 | } |
615 | ||
616 | #else | |
617 | static inline void cpu_register_vulnerabilities(void) { } | |
618 | #endif | |
619 | ||
024f7846 | 620 | void __init cpu_dev_init(void) |
1da177e4 | 621 | { |
024f7846 BH |
622 | if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups)) |
623 | panic("Failed to register CPU subsystem"); | |
8a25a2fd | 624 | |
9f13a1fd | 625 | cpu_dev_register_generic(); |
87590ce6 | 626 | cpu_register_vulnerabilities(); |
1da177e4 | 627 | } |