cpu.c revision 7affca3537d74365128e477b40c529d6f2fe86c8
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 28a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers * CPU subsystem support 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 7f6a570333e554b48ad589e7137c77c57809eee81Al Viro#include <linux/sched.h> 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/cpu.h> 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/topology.h> 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/device.h> 1176b67ed9dce69a6a329cdd66f94af1787f417b62KAMEZAWA Hiroyuki#include <linux/node.h> 125a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/gfp.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14a1bdc7aad8b557176ccecff1da137ebe3090871eBen Dooks#include "base.h" 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 168a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstruct bus_type cpu_subsys = { 17af5ca3f4ec5cc4432a42a73b050dd8898ce8fd00Kay Sievers .name = "cpu", 188a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers .dev_name = "cpu", 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 208a25a2fd126c621f44f3aeaef80d51f00fc11639Kay SieversEXPORT_SYMBOL_GPL(cpu_subsys); 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 228a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic DEFINE_PER_CPU(struct device *, cpu_sys_devices); 23ad74557a49d1dea428fb0ad60e75a5aa37610e1dAshok Raj 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_HOTPLUG_CPU 258a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic ssize_t show_online(struct device *dev, 268a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct device_attribute *attr, 274a0b2b4dbe1335b8b9886ba3dc85a145d5d938edAndi Kleen char *buf) 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 298a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct cpu *cpu = container_of(dev, struct cpu, dev); 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 318a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers return sprintf(buf, "%u\n", !!cpu_online(cpu->dev.id)); 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 348a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic ssize_t __ref store_online(struct device *dev, 358a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct device_attribute *attr, 368a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers const char *buf, size_t count) 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 388a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct cpu *cpu = container_of(dev, struct cpu, dev); 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ssize_t ret; 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4151badebdcf394cc5fd574a524b55b3f6085e5e9cGautham R Shenoy cpu_hotplug_driver_lock(); 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (buf[0]) { 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case '0': 448a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers ret = cpu_down(cpu->dev.id); 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!ret) 46312c004d36ce6c739512bac83b452f4c20ab1f62Kay Sievers kobject_uevent(&dev->kobj, KOBJ_OFFLINE); 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case '1': 498a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers ret = cpu_up(cpu->dev.id); 50fb69c3907ead36b9e9f41ea6f0d0e0ae10a38a47Nathan Lynch if (!ret) 51312c004d36ce6c739512bac83b452f4c20ab1f62Kay Sievers kobject_uevent(&dev->kobj, KOBJ_ONLINE); 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = -EINVAL; 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5651badebdcf394cc5fd574a524b55b3f6085e5e9cGautham R Shenoy cpu_hotplug_driver_unlock(); 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (ret >= 0) 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ret = count; 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ret; 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 628a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic DEVICE_ATTR(online, 0644, show_online, store_online); 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 646c847402e1c69c1cfe2bddeadc8391bacbb3d0a5Sam Ravnborgstatic void __cpuinit register_cpu_control(struct cpu *cpu) 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 668a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers device_create_file(&cpu->dev, &dev_attr_online); 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6876b67ed9dce69a6a329cdd66f94af1787f417b62KAMEZAWA Hiroyukivoid unregister_cpu(struct cpu *cpu) 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 708a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers int logical_cpu = cpu->dev.id; 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7276b67ed9dce69a6a329cdd66f94af1787f417b62KAMEZAWA Hiroyuki unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu)); 7376b67ed9dce69a6a329cdd66f94af1787f417b62KAMEZAWA Hiroyuki 748a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers device_remove_file(&cpu->dev, &dev_attr_online); 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 768a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers device_unregister(&cpu->dev); 77e37d05dad7ff9744efd8ea95a70d389e9a65a6fcMike Travis per_cpu(cpu_sys_devices, logical_cpu) = NULL; 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8012633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot 8112633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE 828a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic ssize_t cpu_probe_store(struct device *dev, 838a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct device_attribute *attr, 8467fc233f4fb67907861b4077cea5294035f80dc7Stephen Rothwell const char *buf, 8512633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot size_t count) 8612633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot{ 8712633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot return arch_cpu_probe(buf, count); 8812633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot} 8912633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot 908a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic ssize_t cpu_release_store(struct device *dev, 918a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct device_attribute *attr, 9267fc233f4fb67907861b4077cea5294035f80dc7Stephen Rothwell const char *buf, 9312633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot size_t count) 9412633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot{ 9512633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot return arch_cpu_release(buf, count); 9612633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot} 9712633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot 988a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic DEVICE_ATTR(probe, S_IWUSR, NULL, cpu_probe_store); 998a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic DEVICE_ATTR(release, S_IWUSR, NULL, cpu_release_store); 10012633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ 10112633e803a2a556f6469e0933d08233d0844a2d9Nathan Fontenot 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#else /* ... !CONFIG_HOTPLUG_CPU */ 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic inline void register_cpu_control(struct cpu *cpu) 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif /* CONFIG_HOTPLUG_CPU */ 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10851be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal#ifdef CONFIG_KEXEC 10951be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal#include <linux/kexec.h> 11051be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal 1118a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic ssize_t show_crash_notes(struct device *dev, struct device_attribute *attr, 1124a0b2b4dbe1335b8b9886ba3dc85a145d5d938edAndi Kleen char *buf) 11351be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal{ 1148a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct cpu *cpu = container_of(dev, struct cpu, dev); 11551be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal ssize_t rc; 11651be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal unsigned long long addr; 11751be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal int cpunum; 11851be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal 1198a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers cpunum = cpu->dev.id; 12051be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal 12151be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal /* 12251be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal * Might be reading other cpu's data based on which cpu read thread 12351be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal * has been scheduled. But cpu data (memory) is allocated once during 12451be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal * boot up and this data does not change there after. Hence this 12551be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal * operation should be safe. No locking required. 12651be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal */ 1273b034b0d084221596bf35c8d893e1d4d5477b9ccVivek Goyal addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpunum)); 12851be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal rc = sprintf(buf, "%Lx\n", addr); 12951be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal return rc; 13051be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal} 1318a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL); 13251be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal#endif 13351be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1359d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis * Print cpu online, possible, present, and system maps 1369d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis */ 137265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen 138265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleenstruct cpu_attr { 1398a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct device_attribute attr; 140265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen const struct cpumask *const * const map; 141265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen}; 142265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen 1438a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic ssize_t show_cpus_attr(struct device *dev, 1448a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct device_attribute *attr, 145265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen char *buf) 1469d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis{ 147265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen struct cpu_attr *ca = container_of(attr, struct cpu_attr, attr); 148265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *(ca->map)); 1499d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis 1509d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis buf[n++] = '\n'; 1519d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis buf[n] = '\0'; 1529d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis return n; 1539d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis} 1549d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis 1558a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers#define _CPU_ATTR(name, map) \ 1568a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers { __ATTR(name, 0444, show_cpus_attr, NULL), map } 1579d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis 1588a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers/* Keep in sync with cpu_subsys_attrs */ 159265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleenstatic struct cpu_attr cpu_attrs[] = { 160265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen _CPU_ATTR(online, &cpu_online_mask), 161265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen _CPU_ATTR(possible, &cpu_possible_mask), 162265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen _CPU_ATTR(present, &cpu_present_mask), 163265d2e2e31c5f6dc1b20ae1653a17fdba706f79eAndi Kleen}; 1649d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis 165e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis/* 166e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis * Print values for NR_CPUS and offlined cpus 167e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis */ 1688a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic ssize_t print_cpus_kernel_max(struct device *dev, 1698a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct device_attribute *attr, char *buf) 170e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis{ 1718fd2d2d5aaf086cfa3b2e2e58cab96b7afdc9e51Mike Travis int n = snprintf(buf, PAGE_SIZE-2, "%d\n", NR_CPUS - 1); 172e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis return n; 173e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis} 1748a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic DEVICE_ATTR(kernel_max, 0444, print_cpus_kernel_max, NULL); 175e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis 176e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis/* arch-optional setting to enable display of offline cpus >= nr_cpu_ids */ 177e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travisunsigned int total_cpus; 178e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis 1798a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic ssize_t print_cpus_offline(struct device *dev, 1808a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers struct device_attribute *attr, char *buf) 181e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis{ 182e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis int n = 0, len = PAGE_SIZE-2; 183e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis cpumask_var_t offline; 184e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis 185e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis /* display offline cpus < nr_cpu_ids */ 186e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis if (!alloc_cpumask_var(&offline, GFP_KERNEL)) 187e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis return -ENOMEM; 188cdc6e3d3968052cebb2f2ddcd742bff29fbd1a90Jan Beulich cpumask_andnot(offline, cpu_possible_mask, cpu_online_mask); 189e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis n = cpulist_scnprintf(buf, len, offline); 190e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis free_cpumask_var(offline); 191e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis 192e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis /* display offline cpus >= nr_cpu_ids */ 193e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis if (total_cpus && nr_cpu_ids < total_cpus) { 194e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis if (n && n < len) 195e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis buf[n++] = ','; 196e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis 197e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis if (nr_cpu_ids == total_cpus-1) 198e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis n += snprintf(&buf[n], len - n, "%d", nr_cpu_ids); 199e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis else 200e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis n += snprintf(&buf[n], len - n, "%d-%d", 201e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis nr_cpu_ids, total_cpus-1); 202e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis } 203e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis 204e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis n += snprintf(&buf[n], len - n, "\n"); 205e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis return n; 206e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis} 2078a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL); 208e057d7aea9d8f2a46cd440d8bfb72245d4e72d79Mike Travis 2099d1fe3236a1d64ab687e16b4cbbaa1383352a2c1Mike Travis/* 210405ae7d381302468ecc803f2148a2ae40a04c999Robert P. J. Day * register_cpu - Setup a sysfs device for a CPU. 21172486f1f8f0a2bc828b9d30cf4690cf2dd6807fcSiddha, Suresh B * @cpu - cpu->hotpluggable field set to 1 will generate a control file in 21272486f1f8f0a2bc828b9d30cf4690cf2dd6807fcSiddha, Suresh B * sysfs for this CPU. 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * @num - CPU number to use when creating the device. 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Initialize and register the CPU device. 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 21733b5f31bbc4d047d048d8635fccdab38ffe6c287Randy Dunlapint __cpuinit register_cpu(struct cpu *cpu, int num) 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int error; 22076b67ed9dce69a6a329cdd66f94af1787f417b62KAMEZAWA Hiroyuki 2218a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers cpu->node_id = cpu_to_node(num); 2228a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers cpu->dev.id = num; 2238a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers cpu->dev.bus = &cpu_subsys; 2248a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers error = device_register(&cpu->dev); 22572486f1f8f0a2bc828b9d30cf4690cf2dd6807fcSiddha, Suresh B if (!error && cpu->hotpluggable) 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds register_cpu_control(cpu); 227ad74557a49d1dea428fb0ad60e75a5aa37610e1dAshok Raj if (!error) 2288a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers per_cpu(cpu_sys_devices, num) = &cpu->dev; 22976b67ed9dce69a6a329cdd66f94af1787f417b62KAMEZAWA Hiroyuki if (!error) 23076b67ed9dce69a6a329cdd66f94af1787f417b62KAMEZAWA Hiroyuki register_cpu_under_node(num, cpu_to_node(num)); 23151be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal 23251be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal#ifdef CONFIG_KEXEC 23351be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal if (!error) 2348a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers error = device_create_file(&cpu->dev, &dev_attr_crash_notes); 23551be5606d9ff9eb27ed6514f6172fbd7578a25d6Vivek Goyal#endif 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return error; 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2398a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstruct device *get_cpu_device(unsigned cpu) 240ad74557a49d1dea428fb0ad60e75a5aa37610e1dAshok Raj{ 241e37d05dad7ff9744efd8ea95a70d389e9a65a6fcMike Travis if (cpu < nr_cpu_ids && cpu_possible(cpu)) 242e37d05dad7ff9744efd8ea95a70d389e9a65a6fcMike Travis return per_cpu(cpu_sys_devices, cpu); 243ad74557a49d1dea428fb0ad60e75a5aa37610e1dAshok Raj else 244ad74557a49d1dea428fb0ad60e75a5aa37610e1dAshok Raj return NULL; 245ad74557a49d1dea428fb0ad60e75a5aa37610e1dAshok Raj} 2468a25a2fd126c621f44f3aeaef80d51f00fc11639Kay SieversEXPORT_SYMBOL_GPL(get_cpu_device); 2478a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers 2488a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic struct attribute *cpu_root_attrs[] = { 2498a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE 2508a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers &dev_attr_probe.attr, 2518a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers &dev_attr_release.attr, 2528a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers#endif 2538a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers &cpu_attrs[0].attr.attr, 2548a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers &cpu_attrs[1].attr.attr, 2558a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers &cpu_attrs[2].attr.attr, 2568a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers &dev_attr_kernel_max.attr, 2578a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers &dev_attr_offline.attr, 2588a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers NULL 2598a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers}; 2608a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers 2618a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic struct attribute_group cpu_root_attr_group = { 2628a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers .attrs = cpu_root_attrs, 2638a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers}; 2648a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers 2658a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sieversstatic const struct attribute_group *cpu_root_attr_groups[] = { 2668a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers &cpu_root_attr_group, 2678a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers NULL, 2688a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers}; 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2702987557f52b97f679f0c324d8f51b8d66e1f2084Josh Triplettbool cpu_is_hotpluggable(unsigned cpu) 2712987557f52b97f679f0c324d8f51b8d66e1f2084Josh Triplett{ 2727affca3537d74365128e477b40c529d6f2fe86c8Linus Torvalds struct device *dev = get_cpu_device(cpu); 2737affca3537d74365128e477b40c529d6f2fe86c8Linus Torvalds return dev && container_of(dev, struct cpu, dev)->hotpluggable; 2742987557f52b97f679f0c324d8f51b8d66e1f2084Josh Triplett} 2752987557f52b97f679f0c324d8f51b8d66e1f2084Josh TriplettEXPORT_SYMBOL_GPL(cpu_is_hotpluggable); 2762987557f52b97f679f0c324d8f51b8d66e1f2084Josh Triplett 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint __init cpu_dev_init(void) 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2795c45bf279d378d436ce45825c0f136696c7b6109Siddha, Suresh B int err; 2805c45bf279d378d436ce45825c0f136696c7b6109Siddha, Suresh B 2818a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers err = subsys_system_register(&cpu_subsys, cpu_root_attr_groups); 2828a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers if (err) 2838a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers return err; 2848a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers 2855c45bf279d378d436ce45825c0f136696c7b6109Siddha, Suresh B#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT) 2868a25a2fd126c621f44f3aeaef80d51f00fc11639Kay Sievers err = sched_create_sysfs_power_savings_entries(cpu_subsys.dev_root); 2875c45bf279d378d436ce45825c0f136696c7b6109Siddha, Suresh B#endif 2885c45bf279d378d436ce45825c0f136696c7b6109Siddha, Suresh B return err; 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 290