Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 2 | * CPU subsystem support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | */ |
| 4 | |
Ben Hutchings | 024f784 | 2012-01-10 02:59:49 +0000 | [diff] [blame] | 5 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/module.h> |
| 7 | #include <linux/init.h> |
Al Viro | f6a5703 | 2006-10-18 01:47:25 -0400 | [diff] [blame] | 8 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/cpu.h> |
| 10 | #include <linux/topology.h> |
| 11 | #include <linux/device.h> |
KAMEZAWA Hiroyuki | 76b67ed9 | 2006-06-27 02:53:41 -0700 | [diff] [blame] | 12 | #include <linux/node.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/gfp.h> |
Thomas Renninger | fad12ac | 2012-01-26 00:09:14 +0100 | [diff] [blame] | 14 | #include <linux/slab.h> |
Ben Hutchings | 9f13a1f | 2012-01-10 03:04:32 +0000 | [diff] [blame] | 15 | #include <linux/percpu.h> |
Rafael J. Wysocki | ac212b6 | 2013-05-03 00:26:22 +0200 | [diff] [blame] | 16 | #include <linux/acpi.h> |
Sudeep KarkadaNagesha | f86e471 | 2013-06-17 12:58:45 +0100 | [diff] [blame] | 17 | #include <linux/of.h> |
Ard Biesheuvel | 67bad2f | 2014-02-08 13:34:09 +0100 | [diff] [blame] | 18 | #include <linux/cpufeature.h> |
Rik van Riel | 6570a9a | 2015-04-24 15:24:28 -0400 | [diff] [blame] | 19 | #include <linux/tick.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Ben Dooks | a1bdc7a | 2005-10-13 17:54:41 +0100 | [diff] [blame] | 21 | #include "base.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 23 | static DEFINE_PER_CPU(struct device *, cpu_sys_devices); |
Ashok Raj | ad74557 | 2005-10-30 14:59:49 -0800 | [diff] [blame] | 24 | |
Rafael J. Wysocki | ac212b6 | 2013-05-03 00:26:22 +0200 | [diff] [blame] | 25 | static int cpu_subsys_match(struct device *dev, struct device_driver *drv) |
| 26 | { |
| 27 | /* ACPI style match is the only one that may succeed. */ |
| 28 | if (acpi_driver_match_device(dev, drv)) |
| 29 | return 1; |
| 30 | |
| 31 | return 0; |
| 32 | } |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #ifdef CONFIG_HOTPLUG_CPU |
Yasuaki Ishimatsu | 3464046 | 2013-04-29 15:08:50 -0700 | [diff] [blame] | 35 | static void change_cpu_under_node(struct cpu *cpu, |
| 36 | unsigned int from_nid, unsigned int to_nid) |
| 37 | { |
| 38 | int cpuid = cpu->dev.id; |
| 39 | unregister_cpu_under_node(cpuid, from_nid); |
| 40 | register_cpu_under_node(cpuid, to_nid); |
| 41 | cpu->node_id = to_nid; |
| 42 | } |
| 43 | |
Mathias Krause | eda5867 | 2015-07-19 20:06:21 +0200 | [diff] [blame] | 44 | static int cpu_subsys_online(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | { |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 46 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
Rafael J. Wysocki | 0902a90 | 2013-05-03 00:25:49 +0200 | [diff] [blame] | 47 | int cpuid = dev->id; |
Yasuaki Ishimatsu | 3464046 | 2013-04-29 15:08:50 -0700 | [diff] [blame] | 48 | int from_nid, to_nid; |
Toshi Kani | 6dedcca | 2013-09-25 15:08:27 -0600 | [diff] [blame] | 49 | int ret; |
Yasuaki Ishimatsu | 3464046 | 2013-04-29 15:08:50 -0700 | [diff] [blame] | 50 | |
Rafael J. Wysocki | 0902a90 | 2013-05-03 00:25:49 +0200 | [diff] [blame] | 51 | from_nid = cpu_to_node(cpuid); |
Rafael J. Wysocki | c7991b0 | 2013-08-13 02:39:30 +0200 | [diff] [blame] | 52 | if (from_nid == NUMA_NO_NODE) |
Toshi Kani | 6dedcca | 2013-09-25 15:08:27 -0600 | [diff] [blame] | 53 | return -ENODEV; |
Rafael J. Wysocki | c7991b0 | 2013-08-13 02:39:30 +0200 | [diff] [blame] | 54 | |
Rafael J. Wysocki | 0902a90 | 2013-05-03 00:25:49 +0200 | [diff] [blame] | 55 | ret = cpu_up(cpuid); |
| 56 | /* |
| 57 | * When hot adding memory to memoryless node and enabling a cpu |
| 58 | * on the node, node number of the cpu may internally change. |
| 59 | */ |
| 60 | to_nid = cpu_to_node(cpuid); |
| 61 | if (from_nid != to_nid) |
| 62 | change_cpu_under_node(cpu, from_nid, to_nid); |
Yasuaki Ishimatsu | 3464046 | 2013-04-29 15:08:50 -0700 | [diff] [blame] | 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | return ret; |
| 65 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Rafael J. Wysocki | 0902a90 | 2013-05-03 00:25:49 +0200 | [diff] [blame] | 67 | static int cpu_subsys_offline(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
Toshi Kani | 6dedcca | 2013-09-25 15:08:27 -0600 | [diff] [blame] | 69 | return cpu_down(dev->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
Igor Mammedov | 1c4e2d7 | 2013-05-14 16:46:07 +0200 | [diff] [blame] | 71 | |
KAMEZAWA Hiroyuki | 76b67ed9 | 2006-06-27 02:53:41 -0700 | [diff] [blame] | 72 | void unregister_cpu(struct cpu *cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | { |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 74 | int logical_cpu = cpu->dev.id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
KAMEZAWA Hiroyuki | 76b67ed9 | 2006-06-27 02:53:41 -0700 | [diff] [blame] | 76 | unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu)); |
| 77 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 78 | device_unregister(&cpu->dev); |
Mike Travis | e37d05d | 2008-05-01 04:35:16 -0700 | [diff] [blame] | 79 | per_cpu(cpu_sys_devices, logical_cpu) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | return; |
| 81 | } |
Nathan Fontenot | 12633e8 | 2009-11-25 17:23:25 +0000 | [diff] [blame] | 82 | |
| 83 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 84 | static ssize_t cpu_probe_store(struct device *dev, |
| 85 | struct device_attribute *attr, |
Stephen Rothwell | 67fc233 | 2010-03-16 10:33:32 +1100 | [diff] [blame] | 86 | const char *buf, |
Nathan Fontenot | 12633e8 | 2009-11-25 17:23:25 +0000 | [diff] [blame] | 87 | size_t count) |
| 88 | { |
Toshi Kani | 574b851 | 2013-08-29 18:22:07 -0600 | [diff] [blame] | 89 | ssize_t cnt; |
| 90 | int ret; |
| 91 | |
| 92 | ret = lock_device_hotplug_sysfs(); |
| 93 | if (ret) |
| 94 | return ret; |
| 95 | |
| 96 | cnt = arch_cpu_probe(buf, count); |
| 97 | |
| 98 | unlock_device_hotplug(); |
| 99 | return cnt; |
Nathan Fontenot | 12633e8 | 2009-11-25 17:23:25 +0000 | [diff] [blame] | 100 | } |
| 101 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 102 | static ssize_t cpu_release_store(struct device *dev, |
| 103 | struct device_attribute *attr, |
Stephen Rothwell | 67fc233 | 2010-03-16 10:33:32 +1100 | [diff] [blame] | 104 | const char *buf, |
Nathan Fontenot | 12633e8 | 2009-11-25 17:23:25 +0000 | [diff] [blame] | 105 | size_t count) |
| 106 | { |
Toshi Kani | 574b851 | 2013-08-29 18:22:07 -0600 | [diff] [blame] | 107 | ssize_t cnt; |
| 108 | int ret; |
| 109 | |
| 110 | ret = lock_device_hotplug_sysfs(); |
| 111 | if (ret) |
| 112 | return ret; |
| 113 | |
| 114 | cnt = arch_cpu_release(buf, count); |
| 115 | |
| 116 | unlock_device_hotplug(); |
| 117 | return cnt; |
Nathan Fontenot | 12633e8 | 2009-11-25 17:23:25 +0000 | [diff] [blame] | 118 | } |
| 119 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 120 | static DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store); |
| 121 | static DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store); |
Nathan Fontenot | 12633e8 | 2009-11-25 17:23:25 +0000 | [diff] [blame] | 122 | #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 124 | |
Rafael J. Wysocki | 0902a90 | 2013-05-03 00:25:49 +0200 | [diff] [blame] | 125 | struct bus_type cpu_subsys = { |
| 126 | .name = "cpu", |
| 127 | .dev_name = "cpu", |
Rafael J. Wysocki | ac212b6 | 2013-05-03 00:26:22 +0200 | [diff] [blame] | 128 | .match = cpu_subsys_match, |
Rafael J. Wysocki | 0902a90 | 2013-05-03 00:25:49 +0200 | [diff] [blame] | 129 | #ifdef CONFIG_HOTPLUG_CPU |
| 130 | .online = cpu_subsys_online, |
| 131 | .offline = cpu_subsys_offline, |
| 132 | #endif |
| 133 | }; |
| 134 | EXPORT_SYMBOL_GPL(cpu_subsys); |
| 135 | |
Vivek Goyal | 51be560 | 2006-01-09 20:51:42 -0800 | [diff] [blame] | 136 | #ifdef CONFIG_KEXEC |
| 137 | #include <linux/kexec.h> |
| 138 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 139 | static ssize_t show_crash_notes(struct device *dev, struct device_attribute *attr, |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 140 | char *buf) |
Vivek Goyal | 51be560 | 2006-01-09 20:51:42 -0800 | [diff] [blame] | 141 | { |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 142 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
Vivek Goyal | 51be560 | 2006-01-09 20:51:42 -0800 | [diff] [blame] | 143 | ssize_t rc; |
| 144 | unsigned long long addr; |
| 145 | int cpunum; |
| 146 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 147 | cpunum = cpu->dev.id; |
Vivek Goyal | 51be560 | 2006-01-09 20:51:42 -0800 | [diff] [blame] | 148 | |
| 149 | /* |
| 150 | * Might be reading other cpu's data based on which cpu read thread |
| 151 | * has been scheduled. But cpu data (memory) is allocated once during |
| 152 | * boot up and this data does not change there after. Hence this |
| 153 | * operation should be safe. No locking required. |
| 154 | */ |
Vivek Goyal | 3b034b0 | 2009-11-24 15:50:03 +0900 | [diff] [blame] | 155 | addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum)); |
Vivek Goyal | 51be560 | 2006-01-09 20:51:42 -0800 | [diff] [blame] | 156 | rc = sprintf(buf, "%Lx\n", addr); |
Vivek Goyal | 51be560 | 2006-01-09 20:51:42 -0800 | [diff] [blame] | 157 | return rc; |
| 158 | } |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 159 | static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL); |
Zhang Yanfei | eca4549 | 2013-03-28 16:15:35 +0800 | [diff] [blame] | 160 | |
| 161 | static ssize_t show_crash_notes_size(struct device *dev, |
| 162 | struct device_attribute *attr, |
| 163 | char *buf) |
| 164 | { |
| 165 | ssize_t rc; |
| 166 | |
Arnd Bergmann | bcfb87f | 2013-04-03 15:18:24 +0000 | [diff] [blame] | 167 | rc = sprintf(buf, "%zu\n", sizeof(note_buf_t)); |
Zhang Yanfei | eca4549 | 2013-03-28 16:15:35 +0800 | [diff] [blame] | 168 | return rc; |
| 169 | } |
| 170 | static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL); |
Igor Mammedov | c055da9 | 2013-05-14 16:46:06 +0200 | [diff] [blame] | 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 | |
| 178 | static struct attribute_group crash_note_cpu_attr_group = { |
| 179 | .attrs = crash_note_cpu_attrs, |
| 180 | }; |
Vivek Goyal | 51be560 | 2006-01-09 20:51:42 -0800 | [diff] [blame] | 181 | #endif |
| 182 | |
Olav Haugan | 16bb593 | 2016-06-02 18:06:10 -0700 | [diff] [blame] | 183 | #ifdef CONFIG_HOTPLUG_CPU |
| 184 | |
Olav Haugan | eeafb78 | 2017-02-09 16:46:45 -0800 | [diff] [blame] | 185 | static ssize_t isolate_show(struct device *dev, |
| 186 | struct device_attribute *attr, char *buf) |
Olav Haugan | 16bb593 | 2016-06-02 18:06:10 -0700 | [diff] [blame] | 187 | { |
| 188 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
| 189 | ssize_t rc; |
| 190 | int cpuid = cpu->dev.id; |
| 191 | unsigned int isolated = cpu_isolated(cpuid); |
| 192 | |
| 193 | rc = snprintf(buf, PAGE_SIZE-2, "%d\n", isolated); |
| 194 | |
| 195 | return rc; |
| 196 | } |
| 197 | |
Olav Haugan | eeafb78 | 2017-02-09 16:46:45 -0800 | [diff] [blame] | 198 | static DEVICE_ATTR_RO(isolate); |
Olav Haugan | 16bb593 | 2016-06-02 18:06:10 -0700 | [diff] [blame] | 199 | |
| 200 | static struct attribute *cpu_isolated_attrs[] = { |
| 201 | &dev_attr_isolate.attr, |
| 202 | NULL |
| 203 | }; |
| 204 | |
| 205 | static struct attribute_group cpu_isolated_attr_group = { |
| 206 | .attrs = cpu_isolated_attrs, |
| 207 | }; |
| 208 | |
| 209 | #endif |
| 210 | |
Syed Rameez Mustafa | ebc437b | 2016-12-13 15:57:19 -0800 | [diff] [blame] | 211 | #ifdef CONFIG_SCHED_HMP |
| 212 | |
| 213 | static ssize_t show_sched_static_cpu_pwr_cost(struct device *dev, |
| 214 | struct device_attribute *attr, char *buf) |
| 215 | { |
| 216 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
| 217 | ssize_t rc; |
| 218 | int cpuid = cpu->dev.id; |
| 219 | unsigned int pwr_cost; |
| 220 | |
| 221 | pwr_cost = sched_get_static_cpu_pwr_cost(cpuid); |
| 222 | |
| 223 | rc = snprintf(buf, PAGE_SIZE-2, "%d\n", pwr_cost); |
| 224 | |
| 225 | return rc; |
| 226 | } |
| 227 | |
| 228 | static ssize_t __ref store_sched_static_cpu_pwr_cost(struct device *dev, |
| 229 | struct device_attribute *attr, |
| 230 | const char *buf, size_t count) |
| 231 | { |
| 232 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
| 233 | int err; |
| 234 | int cpuid = cpu->dev.id; |
| 235 | unsigned int pwr_cost; |
| 236 | |
| 237 | err = kstrtouint(strstrip((char *)buf), 0, &pwr_cost); |
| 238 | if (err) |
| 239 | return err; |
| 240 | |
| 241 | err = sched_set_static_cpu_pwr_cost(cpuid, pwr_cost); |
| 242 | |
| 243 | if (err >= 0) |
| 244 | err = count; |
| 245 | |
| 246 | return err; |
| 247 | } |
| 248 | |
| 249 | static ssize_t show_sched_static_cluster_pwr_cost(struct device *dev, |
| 250 | struct device_attribute *attr, char *buf) |
| 251 | { |
| 252 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
| 253 | ssize_t rc; |
| 254 | int cpuid = cpu->dev.id; |
| 255 | unsigned int pwr_cost; |
| 256 | |
| 257 | pwr_cost = sched_get_static_cluster_pwr_cost(cpuid); |
| 258 | |
| 259 | rc = snprintf(buf, PAGE_SIZE-2, "%d\n", pwr_cost); |
| 260 | |
| 261 | return rc; |
| 262 | } |
| 263 | |
| 264 | static ssize_t __ref store_sched_static_cluster_pwr_cost(struct device *dev, |
| 265 | struct device_attribute *attr, |
| 266 | const char *buf, size_t count) |
| 267 | { |
| 268 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
| 269 | int err; |
| 270 | int cpuid = cpu->dev.id; |
| 271 | unsigned int pwr_cost; |
| 272 | |
| 273 | err = kstrtouint(strstrip((char *)buf), 0, &pwr_cost); |
| 274 | if (err) |
| 275 | return err; |
| 276 | |
| 277 | err = sched_set_static_cluster_pwr_cost(cpuid, pwr_cost); |
| 278 | |
| 279 | if (err >= 0) |
| 280 | err = count; |
| 281 | |
| 282 | return err; |
| 283 | } |
| 284 | |
Syed Rameez Mustafa | e343972 | 2017-01-04 15:56:51 -0800 | [diff] [blame] | 285 | static ssize_t show_sched_cluser_wake_idle(struct device *dev, |
| 286 | struct device_attribute *attr, char *buf) |
| 287 | { |
| 288 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
| 289 | ssize_t rc; |
| 290 | int cpuid = cpu->dev.id; |
| 291 | unsigned int wake_up_idle; |
| 292 | |
| 293 | wake_up_idle = sched_get_cluster_wake_idle(cpuid); |
| 294 | |
| 295 | rc = scnprintf(buf, PAGE_SIZE-2, "%d\n", wake_up_idle); |
| 296 | |
| 297 | return rc; |
| 298 | } |
| 299 | |
| 300 | static ssize_t __ref store_sched_cluster_wake_idle(struct device *dev, |
| 301 | struct device_attribute *attr, |
| 302 | const char *buf, size_t count) |
| 303 | { |
| 304 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
| 305 | int err; |
| 306 | int cpuid = cpu->dev.id; |
| 307 | unsigned int wake_up_idle; |
| 308 | |
| 309 | err = kstrtouint(strstrip((char *)buf), 0, &wake_up_idle); |
| 310 | if (err) |
| 311 | return err; |
| 312 | |
| 313 | err = sched_set_cluster_wake_idle(cpuid, wake_up_idle); |
| 314 | |
| 315 | if (err >= 0) |
| 316 | err = count; |
| 317 | |
| 318 | return err; |
| 319 | } |
| 320 | |
Syed Rameez Mustafa | ebc437b | 2016-12-13 15:57:19 -0800 | [diff] [blame] | 321 | static DEVICE_ATTR(sched_static_cpu_pwr_cost, 0644, |
| 322 | show_sched_static_cpu_pwr_cost, |
| 323 | store_sched_static_cpu_pwr_cost); |
| 324 | static DEVICE_ATTR(sched_static_cluster_pwr_cost, 0644, |
| 325 | show_sched_static_cluster_pwr_cost, |
| 326 | store_sched_static_cluster_pwr_cost); |
Syed Rameez Mustafa | e343972 | 2017-01-04 15:56:51 -0800 | [diff] [blame] | 327 | static DEVICE_ATTR(sched_cluster_wake_up_idle, 0644, |
| 328 | show_sched_cluser_wake_idle, |
| 329 | store_sched_cluster_wake_idle); |
Syed Rameez Mustafa | ebc437b | 2016-12-13 15:57:19 -0800 | [diff] [blame] | 330 | |
| 331 | static struct attribute *hmp_sched_cpu_attrs[] = { |
| 332 | &dev_attr_sched_static_cpu_pwr_cost.attr, |
| 333 | &dev_attr_sched_static_cluster_pwr_cost.attr, |
Syed Rameez Mustafa | e343972 | 2017-01-04 15:56:51 -0800 | [diff] [blame] | 334 | &dev_attr_sched_cluster_wake_up_idle.attr, |
Syed Rameez Mustafa | ebc437b | 2016-12-13 15:57:19 -0800 | [diff] [blame] | 335 | NULL |
| 336 | }; |
| 337 | |
| 338 | static struct attribute_group sched_hmp_cpu_attr_group = { |
| 339 | .attrs = hmp_sched_cpu_attrs, |
| 340 | }; |
| 341 | |
| 342 | #endif /* CONFIG_SCHED_HMP */ |
Igor Mammedov | c055da9 | 2013-05-14 16:46:06 +0200 | [diff] [blame] | 343 | static const struct attribute_group *common_cpu_attr_groups[] = { |
| 344 | #ifdef CONFIG_KEXEC |
| 345 | &crash_note_cpu_attr_group, |
| 346 | #endif |
Syed Rameez Mustafa | ebc437b | 2016-12-13 15:57:19 -0800 | [diff] [blame] | 347 | #ifdef CONFIG_SCHED_HMP |
| 348 | &sched_hmp_cpu_attr_group, |
| 349 | #endif |
Olav Haugan | 16bb593 | 2016-06-02 18:06:10 -0700 | [diff] [blame] | 350 | #ifdef CONFIG_HOTPLUG_CPU |
| 351 | &cpu_isolated_attr_group, |
| 352 | #endif |
Igor Mammedov | c055da9 | 2013-05-14 16:46:06 +0200 | [diff] [blame] | 353 | NULL |
| 354 | }; |
| 355 | |
Igor Mammedov | 1c4e2d7 | 2013-05-14 16:46:07 +0200 | [diff] [blame] | 356 | static const struct attribute_group *hotplugable_cpu_attr_groups[] = { |
| 357 | #ifdef CONFIG_KEXEC |
| 358 | &crash_note_cpu_attr_group, |
| 359 | #endif |
Syed Rameez Mustafa | ebc437b | 2016-12-13 15:57:19 -0800 | [diff] [blame] | 360 | #ifdef CONFIG_SCHED_HMP |
| 361 | &sched_hmp_cpu_attr_group, |
| 362 | #endif |
Olav Haugan | 16bb593 | 2016-06-02 18:06:10 -0700 | [diff] [blame] | 363 | #ifdef CONFIG_HOTPLUG_CPU |
| 364 | &cpu_isolated_attr_group, |
| 365 | #endif |
Igor Mammedov | 1c4e2d7 | 2013-05-14 16:46:07 +0200 | [diff] [blame] | 366 | NULL |
| 367 | }; |
| 368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | /* |
Mike Travis | 9d1fe323 | 2008-04-08 11:43:04 -0700 | [diff] [blame] | 370 | * Print cpu online, possible, present, and system maps |
| 371 | */ |
Andi Kleen | 265d2e2 | 2010-01-05 12:48:00 +0100 | [diff] [blame] | 372 | |
| 373 | struct cpu_attr { |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 374 | struct device_attribute attr; |
Rasmus Villemoes | 848e239 | 2016-01-20 15:00:22 -0800 | [diff] [blame] | 375 | const struct cpumask *const map; |
Andi Kleen | 265d2e2 | 2010-01-05 12:48:00 +0100 | [diff] [blame] | 376 | }; |
| 377 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 378 | static ssize_t show_cpus_attr(struct device *dev, |
| 379 | struct device_attribute *attr, |
Andi Kleen | 265d2e2 | 2010-01-05 12:48:00 +0100 | [diff] [blame] | 380 | char *buf) |
Mike Travis | 9d1fe323 | 2008-04-08 11:43:04 -0700 | [diff] [blame] | 381 | { |
Andi Kleen | 265d2e2 | 2010-01-05 12:48:00 +0100 | [diff] [blame] | 382 | struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr); |
Mike Travis | 9d1fe323 | 2008-04-08 11:43:04 -0700 | [diff] [blame] | 383 | |
Rasmus Villemoes | 848e239 | 2016-01-20 15:00:22 -0800 | [diff] [blame] | 384 | return cpumap_print_to_pagebuf(true, buf, ca->map); |
Mike Travis | 9d1fe323 | 2008-04-08 11:43:04 -0700 | [diff] [blame] | 385 | } |
| 386 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 387 | #define _CPU_ATTR(name, map) \ |
| 388 | { __ATTR(name, 0444, show_cpus_attr, NULL), map } |
Mike Travis | 9d1fe323 | 2008-04-08 11:43:04 -0700 | [diff] [blame] | 389 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 390 | /* Keep in sync with cpu_subsys_attrs */ |
Andi Kleen | 265d2e2 | 2010-01-05 12:48:00 +0100 | [diff] [blame] | 391 | static struct cpu_attr cpu_attrs[] = { |
Rasmus Villemoes | 848e239 | 2016-01-20 15:00:22 -0800 | [diff] [blame] | 392 | _CPU_ATTR(online, &__cpu_online_mask), |
| 393 | _CPU_ATTR(possible, &__cpu_possible_mask), |
| 394 | _CPU_ATTR(present, &__cpu_present_mask), |
Sabyasachi Singh | ac7e2d3 | 2017-04-03 11:57:15 -0700 | [diff] [blame] | 395 | _CPU_ATTR(core_ctl_isolated, &__cpu_isolated_mask), |
Andi Kleen | 265d2e2 | 2010-01-05 12:48:00 +0100 | [diff] [blame] | 396 | }; |
Mike Travis | 9d1fe323 | 2008-04-08 11:43:04 -0700 | [diff] [blame] | 397 | |
Mike Travis | e057d7a | 2008-12-15 20:26:48 -0800 | [diff] [blame] | 398 | /* |
| 399 | * Print values for NR_CPUS and offlined cpus |
| 400 | */ |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 401 | static ssize_t print_cpus_kernel_max(struct device *dev, |
| 402 | struct device_attribute *attr, char *buf) |
Mike Travis | e057d7a | 2008-12-15 20:26:48 -0800 | [diff] [blame] | 403 | { |
Mike Travis | 8fd2d2d | 2008-12-31 18:08:48 -0800 | [diff] [blame] | 404 | int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1); |
Mike Travis | e057d7a | 2008-12-15 20:26:48 -0800 | [diff] [blame] | 405 | return n; |
| 406 | } |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 407 | static DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL); |
Mike Travis | e057d7a | 2008-12-15 20:26:48 -0800 | [diff] [blame] | 408 | |
| 409 | /* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */ |
| 410 | unsigned int total_cpus; |
| 411 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 412 | static ssize_t print_cpus_offline(struct device *dev, |
| 413 | struct device_attribute *attr, char *buf) |
Mike Travis | e057d7a | 2008-12-15 20:26:48 -0800 | [diff] [blame] | 414 | { |
| 415 | int n = 0, len = PAGE_SIZE-2; |
| 416 | cpumask_var_t offline; |
| 417 | |
| 418 | /* display offline cpus < nr_cpu_ids */ |
| 419 | if (!alloc_cpumask_var(&offline, GFP_KERNEL)) |
| 420 | return -ENOMEM; |
Jan Beulich | cdc6e3d | 2010-04-27 14:01:20 -0700 | [diff] [blame] | 421 | cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask); |
Tejun Heo | f799b1a | 2015-02-13 14:37:56 -0800 | [diff] [blame] | 422 | n = scnprintf(buf, len, "%*pbl", cpumask_pr_args(offline)); |
Mike Travis | e057d7a | 2008-12-15 20:26:48 -0800 | [diff] [blame] | 423 | free_cpumask_var(offline); |
| 424 | |
| 425 | /* display offline cpus >= nr_cpu_ids */ |
| 426 | if (total_cpus && nr_cpu_ids < total_cpus) { |
| 427 | if (n && n < len) |
| 428 | buf[n++] = ','; |
| 429 | |
| 430 | if (nr_cpu_ids == total_cpus-1) |
| 431 | n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids); |
| 432 | else |
| 433 | n += snprintf(&buf[n], len - n, "%d-%d", |
| 434 | nr_cpu_ids, total_cpus-1); |
| 435 | } |
| 436 | |
| 437 | n += snprintf(&buf[n], len - n, "\n"); |
| 438 | return n; |
| 439 | } |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 440 | static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL); |
Mike Travis | e057d7a | 2008-12-15 20:26:48 -0800 | [diff] [blame] | 441 | |
Rik van Riel | 59f30ab | 2015-04-24 15:24:27 -0400 | [diff] [blame] | 442 | static ssize_t print_cpus_isolated(struct device *dev, |
| 443 | struct device_attribute *attr, char *buf) |
| 444 | { |
| 445 | int n = 0, len = PAGE_SIZE-2; |
| 446 | |
| 447 | n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(cpu_isolated_map)); |
| 448 | |
| 449 | return n; |
| 450 | } |
| 451 | static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL); |
| 452 | |
Rik van Riel | 6570a9a | 2015-04-24 15:24:28 -0400 | [diff] [blame] | 453 | #ifdef CONFIG_NO_HZ_FULL |
| 454 | static ssize_t print_cpus_nohz_full(struct device *dev, |
| 455 | struct device_attribute *attr, char *buf) |
| 456 | { |
| 457 | int n = 0, len = PAGE_SIZE-2; |
| 458 | |
| 459 | n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(tick_nohz_full_mask)); |
| 460 | |
| 461 | return n; |
| 462 | } |
| 463 | static DEVICE_ATTR(nohz_full, 0444, print_cpus_nohz_full, NULL); |
| 464 | #endif |
| 465 | |
Greg Kroah-Hartman | 2885e25 | 2012-02-02 10:36:33 -0800 | [diff] [blame] | 466 | static void cpu_device_release(struct device *dev) |
| 467 | { |
| 468 | /* |
| 469 | * This is an empty function to prevent the driver core from spitting a |
| 470 | * warning at us. Yes, I know this is directly opposite of what the |
| 471 | * documentation for the driver core and kobjects say, and the author |
| 472 | * of this code has already been publically ridiculed for doing |
| 473 | * something as foolish as this. However, at this point in time, it is |
| 474 | * the only way to handle the issue of statically allocated cpu |
| 475 | * devices. The different architectures will have their cpu device |
| 476 | * code reworked to properly handle this in the near future, so this |
| 477 | * function will then be changed to correctly free up the memory held |
| 478 | * by the cpu device. |
| 479 | * |
| 480 | * Never copy this way of doing things, or you too will be made fun of |
Ralf Baechle | 30a4840 | 2013-01-15 15:27:46 +0100 | [diff] [blame] | 481 | * on the linux-kernel list, you have been warned. |
Greg Kroah-Hartman | 2885e25 | 2012-02-02 10:36:33 -0800 | [diff] [blame] | 482 | */ |
| 483 | } |
| 484 | |
Ard Biesheuvel | 67bad2f | 2014-02-08 13:34:09 +0100 | [diff] [blame] | 485 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
| 486 | static ssize_t print_cpu_modalias(struct device *dev, |
| 487 | struct device_attribute *attr, |
| 488 | char *buf) |
| 489 | { |
| 490 | ssize_t n; |
| 491 | u32 i; |
| 492 | |
| 493 | n = sprintf(buf, "cpu:type:" CPU_FEATURE_TYPEFMT ":feature:", |
| 494 | CPU_FEATURE_TYPEVAL); |
| 495 | |
| 496 | for (i = 0; i < MAX_CPU_FEATURES; i++) |
| 497 | if (cpu_have_feature(i)) { |
| 498 | if (PAGE_SIZE < n + sizeof(",XXXX\n")) { |
| 499 | WARN(1, "CPU features overflow page\n"); |
| 500 | break; |
| 501 | } |
| 502 | n += sprintf(&buf[n], ",%04X", i); |
| 503 | } |
| 504 | buf[n++] = '\n'; |
| 505 | return n; |
| 506 | } |
Ard Biesheuvel | 67bad2f | 2014-02-08 13:34:09 +0100 | [diff] [blame] | 507 | |
| 508 | static int cpu_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 509 | { |
| 510 | char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| 511 | if (buf) { |
| 512 | print_cpu_modalias(NULL, NULL, buf); |
| 513 | add_uevent_var(env, "MODALIAS=%s", buf); |
| 514 | kfree(buf); |
| 515 | } |
| 516 | return 0; |
| 517 | } |
| 518 | #endif |
| 519 | |
Mike Travis | 9d1fe323 | 2008-04-08 11:43:04 -0700 | [diff] [blame] | 520 | /* |
Robert P. J. Day | 405ae7d | 2007-02-17 19:13:42 +0100 | [diff] [blame] | 521 | * register_cpu - Setup a sysfs device for a CPU. |
Siddha, Suresh B | 72486f1 | 2006-12-07 02:14:10 +0100 | [diff] [blame] | 522 | * @cpu - cpu->hotpluggable field set to 1 will generate a control file in |
| 523 | * sysfs for this CPU. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | * @num - CPU number to use when creating the device. |
| 525 | * |
| 526 | * Initialize and register the CPU device. |
| 527 | */ |
Paul Gortmaker | a83048e | 2013-06-19 15:22:41 -0400 | [diff] [blame] | 528 | int register_cpu(struct cpu *cpu, int num) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | { |
| 530 | int error; |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | cpu->node_id = cpu_to_node(num); |
Greg Kroah-Hartman | 29bb5d4 | 2012-02-08 15:11:17 -0800 | [diff] [blame] | 533 | memset(&cpu->dev, 0x00, sizeof(struct device)); |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 534 | cpu->dev.id = num; |
| 535 | cpu->dev.bus = &cpu_subsys; |
Greg Kroah-Hartman | 2885e25 | 2012-02-02 10:36:33 -0800 | [diff] [blame] | 536 | cpu->dev.release = cpu_device_release; |
Rafael J. Wysocki | 0902a90 | 2013-05-03 00:25:49 +0200 | [diff] [blame] | 537 | cpu->dev.offline_disabled = !cpu->hotpluggable; |
Toshi Kani | 1001b4d | 2013-05-30 00:30:05 +0200 | [diff] [blame] | 538 | cpu->dev.offline = !cpu_online(num); |
Sudeep KarkadaNagesha | f86e471 | 2013-06-17 12:58:45 +0100 | [diff] [blame] | 539 | cpu->dev.of_node = of_get_cpu_node(num, NULL); |
Ard Biesheuvel | 2b9c1f0 | 2014-02-08 13:34:10 +0100 | [diff] [blame] | 540 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
Ard Biesheuvel | 67bad2f | 2014-02-08 13:34:09 +0100 | [diff] [blame] | 541 | cpu->dev.bus->uevent = cpu_uevent; |
Thomas Renninger | fad12ac | 2012-01-26 00:09:14 +0100 | [diff] [blame] | 542 | #endif |
Igor Mammedov | c055da9 | 2013-05-14 16:46:06 +0200 | [diff] [blame] | 543 | cpu->dev.groups = common_cpu_attr_groups; |
Igor Mammedov | 1c4e2d7 | 2013-05-14 16:46:07 +0200 | [diff] [blame] | 544 | if (cpu->hotpluggable) |
| 545 | cpu->dev.groups = hotplugable_cpu_attr_groups; |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 546 | error = device_register(&cpu->dev); |
Alex Shi | 59fffa3 | 2016-08-25 16:42:39 +0800 | [diff] [blame] | 547 | if (error) |
| 548 | return error; |
Vivek Goyal | 51be560 | 2006-01-09 20:51:42 -0800 | [diff] [blame] | 549 | |
Alex Shi | 59fffa3 | 2016-08-25 16:42:39 +0800 | [diff] [blame] | 550 | per_cpu(cpu_sys_devices, num) = &cpu->dev; |
| 551 | register_cpu_under_node(num, cpu_to_node(num)); |
| 552 | |
| 553 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
| 555 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 556 | struct device *get_cpu_device(unsigned cpu) |
Ashok Raj | ad74557 | 2005-10-30 14:59:49 -0800 | [diff] [blame] | 557 | { |
Mike Travis | e37d05d | 2008-05-01 04:35:16 -0700 | [diff] [blame] | 558 | if (cpu < nr_cpu_ids && cpu_possible(cpu)) |
| 559 | return per_cpu(cpu_sys_devices, cpu); |
Ashok Raj | ad74557 | 2005-10-30 14:59:49 -0800 | [diff] [blame] | 560 | else |
| 561 | return NULL; |
| 562 | } |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 563 | EXPORT_SYMBOL_GPL(get_cpu_device); |
| 564 | |
Sudeep Holla | 3d52943 | 2014-09-30 14:48:24 +0100 | [diff] [blame] | 565 | static void device_create_release(struct device *dev) |
| 566 | { |
| 567 | kfree(dev); |
| 568 | } |
| 569 | |
| 570 | static struct device * |
| 571 | __cpu_device_create(struct device *parent, void *drvdata, |
| 572 | const struct attribute_group **groups, |
| 573 | const char *fmt, va_list args) |
| 574 | { |
| 575 | struct device *dev = NULL; |
| 576 | int retval = -ENODEV; |
| 577 | |
| 578 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 579 | if (!dev) { |
| 580 | retval = -ENOMEM; |
| 581 | goto error; |
| 582 | } |
| 583 | |
| 584 | device_initialize(dev); |
| 585 | dev->parent = parent; |
| 586 | dev->groups = groups; |
| 587 | dev->release = device_create_release; |
| 588 | dev_set_drvdata(dev, drvdata); |
| 589 | |
| 590 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
| 591 | if (retval) |
| 592 | goto error; |
| 593 | |
| 594 | retval = device_add(dev); |
| 595 | if (retval) |
| 596 | goto error; |
| 597 | |
| 598 | return dev; |
| 599 | |
| 600 | error: |
| 601 | put_device(dev); |
| 602 | return ERR_PTR(retval); |
| 603 | } |
| 604 | |
| 605 | struct device *cpu_device_create(struct device *parent, void *drvdata, |
| 606 | const struct attribute_group **groups, |
| 607 | const char *fmt, ...) |
| 608 | { |
| 609 | va_list vargs; |
| 610 | struct device *dev; |
| 611 | |
| 612 | va_start(vargs, fmt); |
| 613 | dev = __cpu_device_create(parent, drvdata, groups, fmt, vargs); |
| 614 | va_end(vargs); |
| 615 | return dev; |
| 616 | } |
| 617 | EXPORT_SYMBOL_GPL(cpu_device_create); |
| 618 | |
Ard Biesheuvel | 2b9c1f0 | 2014-02-08 13:34:10 +0100 | [diff] [blame] | 619 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
Ard Biesheuvel | 67bad2f | 2014-02-08 13:34:09 +0100 | [diff] [blame] | 620 | static DEVICE_ATTR(modalias, 0444, print_cpu_modalias, NULL); |
Thomas Renninger | fad12ac | 2012-01-26 00:09:14 +0100 | [diff] [blame] | 621 | #endif |
| 622 | |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 623 | static struct attribute *cpu_root_attrs[] = { |
| 624 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
| 625 | &dev_attr_probe.attr, |
| 626 | &dev_attr_release.attr, |
| 627 | #endif |
| 628 | &cpu_attrs[0].attr.attr, |
| 629 | &cpu_attrs[1].attr.attr, |
| 630 | &cpu_attrs[2].attr.attr, |
Sabyasachi Singh | ac7e2d3 | 2017-04-03 11:57:15 -0700 | [diff] [blame] | 631 | &cpu_attrs[3].attr.attr, |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 632 | &dev_attr_kernel_max.attr, |
| 633 | &dev_attr_offline.attr, |
Rik van Riel | 59f30ab | 2015-04-24 15:24:27 -0400 | [diff] [blame] | 634 | &dev_attr_isolated.attr, |
Rik van Riel | 6570a9a | 2015-04-24 15:24:28 -0400 | [diff] [blame] | 635 | #ifdef CONFIG_NO_HZ_FULL |
| 636 | &dev_attr_nohz_full.attr, |
| 637 | #endif |
Ard Biesheuvel | 2b9c1f0 | 2014-02-08 13:34:10 +0100 | [diff] [blame] | 638 | #ifdef CONFIG_GENERIC_CPU_AUTOPROBE |
Thomas Renninger | fad12ac | 2012-01-26 00:09:14 +0100 | [diff] [blame] | 639 | &dev_attr_modalias.attr, |
| 640 | #endif |
Kay Sievers | 8a25a2f | 2011-12-21 14:29:42 -0800 | [diff] [blame] | 641 | NULL |
| 642 | }; |
| 643 | |
| 644 | static struct attribute_group cpu_root_attr_group = { |
| 645 | .attrs = cpu_root_attrs, |
| 646 | }; |
| 647 | |
| 648 | static const struct attribute_group *cpu_root_attr_groups[] = { |
| 649 | &cpu_root_attr_group, |
| 650 | NULL, |
| 651 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
Josh Triplett | 2987557 | 2011-12-03 13:06:50 -0800 | [diff] [blame] | 653 | bool cpu_is_hotpluggable(unsigned cpu) |
| 654 | { |
Linus Torvalds | 7affca3 | 2012-01-07 12:03:30 -0800 | [diff] [blame] | 655 | struct device *dev = get_cpu_device(cpu); |
| 656 | return dev && container_of(dev, struct cpu, dev)->hotpluggable; |
Josh Triplett | 2987557 | 2011-12-03 13:06:50 -0800 | [diff] [blame] | 657 | } |
| 658 | EXPORT_SYMBOL_GPL(cpu_is_hotpluggable); |
| 659 | |
Ben Hutchings | 9f13a1f | 2012-01-10 03:04:32 +0000 | [diff] [blame] | 660 | #ifdef CONFIG_GENERIC_CPU_DEVICES |
| 661 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
| 662 | #endif |
| 663 | |
| 664 | static void __init cpu_dev_register_generic(void) |
| 665 | { |
| 666 | #ifdef CONFIG_GENERIC_CPU_DEVICES |
| 667 | int i; |
| 668 | |
| 669 | for_each_possible_cpu(i) { |
| 670 | if (register_cpu(&per_cpu(cpu_devices, i), i)) |
| 671 | panic("Failed to register CPU device"); |
| 672 | } |
| 673 | #endif |
| 674 | } |
| 675 | |
Ben Hutchings | 024f784 | 2012-01-10 02:59:49 +0000 | [diff] [blame] | 676 | void __init cpu_dev_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | { |
Ben Hutchings | 024f784 | 2012-01-10 02:59:49 +0000 | [diff] [blame] | 678 | if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups)) |
| 679 | panic("Failed to register CPU subsystem"); |
Siddha, Suresh B | 5c45bf2 | 2006-06-27 02:54:42 -0700 | [diff] [blame] | 680 | |
Ben Hutchings | 9f13a1f | 2012-01-10 03:04:32 +0000 | [diff] [blame] | 681 | cpu_dev_register_generic(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } |