diff options
Diffstat (limited to 'arch/powerpc/kernel/sysfs.c')
| -rw-r--r-- | arch/powerpc/kernel/sysfs.c | 661 |
1 files changed, 661 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c new file mode 100644 index 00000000..f0f2199e --- /dev/null +++ b/arch/powerpc/kernel/sysfs.c @@ -0,0 +1,661 @@ +#include <linux/sysdev.h> +#include <linux/cpu.h> +#include <linux/smp.h> +#include <linux/percpu.h> +#include <linux/init.h> +#include <linux/sched.h> +#include <linux/module.h> +#include <linux/nodemask.h> +#include <linux/cpumask.h> +#include <linux/notifier.h> + +#include <asm/current.h> +#include <asm/processor.h> +#include <asm/cputable.h> +#include <asm/firmware.h> +#include <asm/hvcall.h> +#include <asm/prom.h> +#include <asm/machdep.h> +#include <asm/smp.h> +#include <asm/pmc.h> + +#include "cacheinfo.h" + +#ifdef CONFIG_PPC64 +#include <asm/paca.h> +#include <asm/lppaca.h> +#endif + +static DEFINE_PER_CPU(struct cpu, cpu_devices); + +/* + * SMT snooze delay stuff, 64-bit only for now + */ + +#ifdef CONFIG_PPC64 + +/* Time in microseconds we delay before sleeping in the idle loop */ +DEFINE_PER_CPU(long, smt_snooze_delay) = { 100 }; + +static ssize_t store_smt_snooze_delay(struct sys_device *dev, + struct sysdev_attribute *attr, + const char *buf, + size_t count) +{ + struct cpu *cpu = container_of(dev, struct cpu, sysdev); + ssize_t ret; + long snooze; + + ret = sscanf(buf, "%ld", &snooze); + if (ret != 1) + return -EINVAL; + + per_cpu(smt_snooze_delay, cpu->sysdev.id) = snooze; + + return count; +} + +static ssize_t show_smt_snooze_delay(struct sys_device *dev, + struct sysdev_attribute *attr, + char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, sysdev); + + return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->sysdev.id)); +} + +static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay, + store_smt_snooze_delay); + +static int __init setup_smt_snooze_delay(char *str) +{ + unsigned int cpu; + long snooze; + + if (!cpu_has_feature(CPU_FTR_SMT)) + return 1; + + snooze = simple_strtol(str, NULL, 10); + for_each_possible_cpu(cpu) + per_cpu(smt_snooze_delay, cpu) = snooze; + + return 1; +} +__setup("smt-snooze-delay=", setup_smt_snooze_delay); + +#endif /* CONFIG_PPC64 */ + +/* + * Enabling PMCs will slow partition context switch times so we only do + * it the first time we write to the PMCs. + */ + +static DEFINE_PER_CPU(char, pmcs_enabled); + +void ppc_enable_pmcs(void) +{ + ppc_set_pmu_inuse(1); + + /* Only need to enable them once */ + if (__get_cpu_var(pmcs_enabled)) + return; + + __get_cpu_var(pmcs_enabled) = 1; + + if (ppc_md.enable_pmcs) + ppc_md.enable_pmcs(); +} +EXPORT_SYMBOL(ppc_enable_pmcs); + +#define SYSFS_PMCSETUP(NAME, ADDRESS) \ +static void read_##NAME(void *val) \ +{ \ + *(unsigned long *)val = mfspr(ADDRESS); \ +} \ +static void write_##NAME(void *val) \ +{ \ + ppc_enable_pmcs(); \ + mtspr(ADDRESS, *(unsigned long *)val); \ +} \ +static ssize_t show_##NAME(struct sys_device *dev, \ + struct sysdev_attribute *attr, \ + char *buf) \ +{ \ + struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ + unsigned long val; \ + smp_call_function_single(cpu->sysdev.id, read_##NAME, &val, 1); \ + return sprintf(buf, "%lx\n", val); \ +} \ +static ssize_t __used \ + store_##NAME(struct sys_device *dev, struct sysdev_attribute *attr, \ + const char *buf, size_t count) \ +{ \ + struct cpu *cpu = container_of(dev, struct cpu, sysdev); \ + unsigned long val; \ + int ret = sscanf(buf, "%lx", &val); \ + if (ret != 1) \ + return -EINVAL; \ + smp_call_function_single(cpu->sysdev.id, write_##NAME, &val, 1); \ + return count; \ +} + + +/* Let's define all possible registers, we'll only hook up the ones + * that are implemented on the current processor + */ + +#if defined(CONFIG_PPC64) +#define HAS_PPC_PMC_CLASSIC 1 +#define HAS_PPC_PMC_IBM 1 +#define HAS_PPC_PMC_PA6T 1 +#elif defined(CONFIG_6xx) +#define HAS_PPC_PMC_CLASSIC 1 +#define HAS_PPC_PMC_IBM 1 +#define HAS_PPC_PMC_G4 1 +#endif + + +#ifdef HAS_PPC_PMC_CLASSIC +SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0); +SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1); +SYSFS_PMCSETUP(pmc1, SPRN_PMC1); +SYSFS_PMCSETUP(pmc2, SPRN_PMC2); +SYSFS_PMCSETUP(pmc3, SPRN_PMC3); +SYSFS_PMCSETUP(pmc4, SPRN_PMC4); +SYSFS_PMCSETUP(pmc5, SPRN_PMC5); +SYSFS_PMCSETUP(pmc6, SPRN_PMC6); + +#ifdef HAS_PPC_PMC_G4 +SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2); +#endif + +#ifdef CONFIG_PPC64 +SYSFS_PMCSETUP(pmc7, SPRN_PMC7); +SYSFS_PMCSETUP(pmc8, SPRN_PMC8); + +SYSFS_PMCSETUP(mmcra, SPRN_MMCRA); +SYSFS_PMCSETUP(purr, SPRN_PURR); +SYSFS_PMCSETUP(spurr, SPRN_SPURR); +SYSFS_PMCSETUP(dscr, SPRN_DSCR); + +static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra); +static SYSDEV_ATTR(spurr, 0600, show_spurr, NULL); +static SYSDEV_ATTR(dscr, 0600, show_dscr, store_dscr); +static SYSDEV_ATTR(purr, 0600, show_purr, store_purr); + +unsigned long dscr_default = 0; +EXPORT_SYMBOL(dscr_default); + +static ssize_t show_dscr_default(struct sysdev_class *class, + struct sysdev_class_attribute *attr, char *buf) +{ + return sprintf(buf, "%lx\n", dscr_default); +} + +static ssize_t __used store_dscr_default(struct sysdev_class *class, + struct sysdev_class_attribute *attr, const char *buf, + size_t count) +{ + unsigned long val; + int ret = 0; + + ret = sscanf(buf, "%lx", &val); + if (ret != 1) + return -EINVAL; + dscr_default = val; + + return count; +} + +static SYSDEV_CLASS_ATTR(dscr_default, 0600, + show_dscr_default, store_dscr_default); + +static void sysfs_create_dscr_default(void) +{ + int err = 0; + if (cpu_has_feature(CPU_FTR_DSCR)) + err = sysfs_create_file(&cpu_sysdev_class.kset.kobj, + &attr_dscr_default.attr); +} +#endif /* CONFIG_PPC64 */ + +#ifdef HAS_PPC_PMC_PA6T +SYSFS_PMCSETUP(pa6t_pmc0, SPRN_PA6T_PMC0); +SYSFS_PMCSETUP(pa6t_pmc1, SPRN_PA6T_PMC1); +SYSFS_PMCSETUP(pa6t_pmc2, SPRN_PA6T_PMC2); +SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3); +SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4); +SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5); +#ifdef CONFIG_DEBUG_KERNEL +SYSFS_PMCSETUP(hid0, SPRN_HID0); +SYSFS_PMCSETUP(hid1, SPRN_HID1); +SYSFS_PMCSETUP(hid4, SPRN_HID4); +SYSFS_PMCSETUP(hid5, SPRN_HID5); +SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0); +SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1); +SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2); +SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3); +SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4); +SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5); +SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6); +SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7); +SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8); +SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9); +SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT); +SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR); +SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR); +SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR); +SYSFS_PMCSETUP(der, SPRN_PA6T_DER); +SYSFS_PMCSETUP(mer, SPRN_PA6T_MER); +SYSFS_PMCSETUP(ber, SPRN_PA6T_BER); +SYSFS_PMCSETUP(ier, SPRN_PA6T_IER); +SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER); +SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR); +SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0); +SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1); +SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2); +SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3); +#endif /* CONFIG_DEBUG_KERNEL */ +#endif /* HAS_PPC_PMC_PA6T */ + +#ifdef HAS_PPC_PMC_IBM +static struct sysdev_attribute ibm_common_attrs[] = { + _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), + _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), +}; +#endif /* HAS_PPC_PMC_G4 */ + +#ifdef HAS_PPC_PMC_G4 +static struct sysdev_attribute g4_common_attrs[] = { + _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), + _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), + _SYSDEV_ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2), +}; +#endif /* HAS_PPC_PMC_G4 */ + +static struct sysdev_attribute classic_pmc_attrs[] = { + _SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1), + _SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2), + _SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3), + _SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4), + _SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5), + _SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6), +#ifdef CONFIG_PPC64 + _SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7), + _SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8), +#endif +}; + +#ifdef HAS_PPC_PMC_PA6T +static struct sysdev_attribute pa6t_attrs[] = { + _SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0), + _SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1), + _SYSDEV_ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0), + _SYSDEV_ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1), + _SYSDEV_ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2), + _SYSDEV_ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3), + _SYSDEV_ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4), + _SYSDEV_ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5), +#ifdef CONFIG_DEBUG_KERNEL + _SYSDEV_ATTR(hid0, 0600, show_hid0, store_hid0), + _SYSDEV_ATTR(hid1, 0600, show_hid1, store_hid1), + _SYSDEV_ATTR(hid4, 0600, show_hid4, store_hid4), + _SYSDEV_ATTR(hid5, 0600, show_hid5, store_hid5), + _SYSDEV_ATTR(ima0, 0600, show_ima0, store_ima0), + _SYSDEV_ATTR(ima1, 0600, show_ima1, store_ima1), + _SYSDEV_ATTR(ima2, 0600, show_ima2, store_ima2), + _SYSDEV_ATTR(ima3, 0600, show_ima3, store_ima3), + _SYSDEV_ATTR(ima4, 0600, show_ima4, store_ima4), + _SYSDEV_ATTR(ima5, 0600, show_ima5, store_ima5), + _SYSDEV_ATTR(ima6, 0600, show_ima6, store_ima6), + _SYSDEV_ATTR(ima7, 0600, show_ima7, store_ima7), + _SYSDEV_ATTR(ima8, 0600, show_ima8, store_ima8), + _SYSDEV_ATTR(ima9, 0600, show_ima9, store_ima9), + _SYSDEV_ATTR(imaat, 0600, show_imaat, store_imaat), + _SYSDEV_ATTR(btcr, 0600, show_btcr, store_btcr), + _SYSDEV_ATTR(pccr, 0600, show_pccr, store_pccr), + _SYSDEV_ATTR(rpccr, 0600, show_rpccr, store_rpccr), + _SYSDEV_ATTR(der, 0600, show_der, store_der), + _SYSDEV_ATTR(mer, 0600, show_mer, store_mer), + _SYSDEV_ATTR(ber, 0600, show_ber, store_ber), + _SYSDEV_ATTR(ier, 0600, show_ier, store_ier), + _SYSDEV_ATTR(sier, 0600, show_sier, store_sier), + _SYSDEV_ATTR(siar, 0600, show_siar, store_siar), + _SYSDEV_ATTR(tsr0, 0600, show_tsr0, store_tsr0), + _SYSDEV_ATTR(tsr1, 0600, show_tsr1, store_tsr1), + _SYSDEV_ATTR(tsr2, 0600, show_tsr2, store_tsr2), + _SYSDEV_ATTR(tsr3, 0600, show_tsr3, store_tsr3), +#endif /* CONFIG_DEBUG_KERNEL */ +}; +#endif /* HAS_PPC_PMC_PA6T */ +#endif /* HAS_PPC_PMC_CLASSIC */ + +static void __cpuinit register_cpu_online(unsigned int cpu) +{ + struct cpu *c = &per_cpu(cpu_devices, cpu); + struct sys_device *s = &c->sysdev; + struct sysdev_attribute *attrs, *pmc_attrs; + int i, nattrs; + +#ifdef CONFIG_PPC64 + if (!firmware_has_feature(FW_FEATURE_ISERIES) && + cpu_has_feature(CPU_FTR_SMT)) + sysdev_create_file(s, &attr_smt_snooze_delay); +#endif + + /* PMC stuff */ + switch (cur_cpu_spec->pmc_type) { +#ifdef HAS_PPC_PMC_IBM + case PPC_PMC_IBM: + attrs = ibm_common_attrs; + nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); + pmc_attrs = classic_pmc_attrs; + break; +#endif /* HAS_PPC_PMC_IBM */ +#ifdef HAS_PPC_PMC_G4 + case PPC_PMC_G4: + attrs = g4_common_attrs; + nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); + pmc_attrs = classic_pmc_attrs; + break; +#endif /* HAS_PPC_PMC_G4 */ +#ifdef HAS_PPC_PMC_PA6T + case PPC_PMC_PA6T: + /* PA Semi starts counting at PMC0 */ + attrs = pa6t_attrs; + nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); + pmc_attrs = NULL; + break; +#endif /* HAS_PPC_PMC_PA6T */ + default: + attrs = NULL; + nattrs = 0; + pmc_attrs = NULL; + } + + for (i = 0; i < nattrs; i++) + sysdev_create_file(s, &attrs[i]); + + if (pmc_attrs) + for (i = 0; i < cur_cpu_spec->num_pmcs; i++) + sysdev_create_file(s, &pmc_attrs[i]); + +#ifdef CONFIG_PPC64 + if (cpu_has_feature(CPU_FTR_MMCRA)) + sysdev_create_file(s, &attr_mmcra); + + if (cpu_has_feature(CPU_FTR_PURR)) + sysdev_create_file(s, &attr_purr); + + if (cpu_has_feature(CPU_FTR_SPURR)) + sysdev_create_file(s, &attr_spurr); + + if (cpu_has_feature(CPU_FTR_DSCR)) + sysdev_create_file(s, &attr_dscr); +#endif /* CONFIG_PPC64 */ + + cacheinfo_cpu_online(cpu); +} + +#ifdef CONFIG_HOTPLUG_CPU +static void unregister_cpu_online(unsigned int cpu) +{ + struct cpu *c = &per_cpu(cpu_devices, cpu); + struct sys_device *s = &c->sysdev; + struct sysdev_attribute *attrs, *pmc_attrs; + int i, nattrs; + + BUG_ON(!c->hotpluggable); + +#ifdef CONFIG_PPC64 + if (!firmware_has_feature(FW_FEATURE_ISERIES) && + cpu_has_feature(CPU_FTR_SMT)) + sysdev_remove_file(s, &attr_smt_snooze_delay); +#endif + + /* PMC stuff */ + switch (cur_cpu_spec->pmc_type) { +#ifdef HAS_PPC_PMC_IBM + case PPC_PMC_IBM: + attrs = ibm_common_attrs; + nattrs = sizeof(ibm_common_attrs) / sizeof(struct sysdev_attribute); + pmc_attrs = classic_pmc_attrs; + break; +#endif /* HAS_PPC_PMC_IBM */ +#ifdef HAS_PPC_PMC_G4 + case PPC_PMC_G4: + attrs = g4_common_attrs; + nattrs = sizeof(g4_common_attrs) / sizeof(struct sysdev_attribute); + pmc_attrs = classic_pmc_attrs; + break; +#endif /* HAS_PPC_PMC_G4 */ +#ifdef HAS_PPC_PMC_PA6T + case PPC_PMC_PA6T: + /* PA Semi starts counting at PMC0 */ + attrs = pa6t_attrs; + nattrs = sizeof(pa6t_attrs) / sizeof(struct sysdev_attribute); + pmc_attrs = NULL; + break; +#endif /* HAS_PPC_PMC_PA6T */ + default: + attrs = NULL; + nattrs = 0; + pmc_attrs = NULL; + } + + for (i = 0; i < nattrs; i++) + sysdev_remove_file(s, &attrs[i]); + + if (pmc_attrs) + for (i = 0; i < cur_cpu_spec->num_pmcs; i++) + sysdev_remove_file(s, &pmc_attrs[i]); + +#ifdef CONFIG_PPC64 + if (cpu_has_feature(CPU_FTR_MMCRA)) + sysdev_remove_file(s, &attr_mmcra); + + if (cpu_has_feature(CPU_FTR_PURR)) + sysdev_remove_file(s, &attr_purr); + + if (cpu_has_feature(CPU_FTR_SPURR)) + sysdev_remove_file(s, &attr_spurr); + + if (cpu_has_feature(CPU_FTR_DSCR)) + sysdev_remove_file(s, &attr_dscr); +#endif /* CONFIG_PPC64 */ + + cacheinfo_cpu_offline(cpu); +} + +#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE +ssize_t arch_cpu_probe(const char *buf, size_t count) +{ + if (ppc_md.cpu_probe) + return ppc_md.cpu_probe(buf, count); + + return -EINVAL; +} + +ssize_t arch_cpu_release(const char *buf, size_t count) +{ + if (ppc_md.cpu_release) + return ppc_md.cpu_release(buf, count); + + return -EINVAL; +} +#endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */ + +#endif /* CONFIG_HOTPLUG_CPU */ + +static int __cpuinit sysfs_cpu_notify(struct notifier_block *self, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned int)(long)hcpu; + + switch (action) { + case CPU_ONLINE: + case CPU_ONLINE_FROZEN: + register_cpu_online(cpu); + break; +#ifdef CONFIG_HOTPLUG_CPU + case CPU_DEAD: + case CPU_DEAD_FROZEN: + unregister_cpu_online(cpu); + break; +#endif + } + return NOTIFY_OK; +} + +static struct notifier_block __cpuinitdata sysfs_cpu_nb = { + .notifier_call = sysfs_cpu_notify, +}; + +static DEFINE_MUTEX(cpu_mutex); + +int cpu_add_sysdev_attr(struct sysdev_attribute *attr) +{ + int cpu; + + mutex_lock(&cpu_mutex); + + for_each_possible_cpu(cpu) { + sysdev_create_file(get_cpu_sysdev(cpu), attr); + } + + mutex_unlock(&cpu_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr); + +int cpu_add_sysdev_attr_group(struct attribute_group *attrs) +{ + int cpu; + struct sys_device *sysdev; + int ret; + + mutex_lock(&cpu_mutex); + + for_each_possible_cpu(cpu) { + sysdev = get_cpu_sysdev(cpu); + ret = sysfs_create_group(&sysdev->kobj, attrs); + WARN_ON(ret != 0); + } + + mutex_unlock(&cpu_mutex); + return 0; +} +EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group); + + +void cpu_remove_sysdev_attr(struct sysdev_attribute *attr) +{ + int cpu; + + mutex_lock(&cpu_mutex); + + for_each_possible_cpu(cpu) { + sysdev_remove_file(get_cpu_sysdev(cpu), attr); + } + + mutex_unlock(&cpu_mutex); +} +EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr); + +void cpu_remove_sysdev_attr_group(struct attribute_group *attrs) +{ + int cpu; + struct sys_device *sysdev; + + mutex_lock(&cpu_mutex); + + for_each_possible_cpu(cpu) { + sysdev = get_cpu_sysdev(cpu); + sysfs_remove_group(&sysdev->kobj, attrs); + } + + mutex_unlock(&cpu_mutex); +} +EXPORT_SYMBOL_GPL(cpu_remove_sysdev_attr_group); + + +/* NUMA stuff */ + +#ifdef CONFIG_NUMA +static void register_nodes(void) +{ + int i; + + for (i = 0; i < MAX_NUMNODES; i++) + register_one_node(i); +} + +int sysfs_add_device_to_node(struct sys_device *dev, int nid) +{ + struct node *node = &node_devices[nid]; + return sysfs_create_link(&node->sysdev.kobj, &dev->kobj, + kobject_name(&dev->kobj)); +} +EXPORT_SYMBOL_GPL(sysfs_add_device_to_node); + +void sysfs_remove_device_from_node(struct sys_device *dev, int nid) +{ + struct node *node = &node_devices[nid]; + sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj)); +} +EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node); + +#else +static void register_nodes(void) +{ + return; +} + +#endif + +/* Only valid if CPU is present. */ +static ssize_t show_physical_id(struct sys_device *dev, + struct sysdev_attribute *attr, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, sysdev); + + return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id)); +} +static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL); + +static int __init topology_init(void) +{ + int cpu; + + register_nodes(); + register_cpu_notifier(&sysfs_cpu_nb); + + for_each_possible_cpu(cpu) { + struct cpu *c = &per_cpu(cpu_devices, cpu); + + /* + * For now, we just see if the system supports making + * the RTAS calls for CPU hotplug. But, there may be a + * more comprehensive way to do this for an individual + * CPU. For instance, the boot cpu might never be valid + * for hotplugging. + */ + if (ppc_md.cpu_die) + c->hotpluggable = 1; + + if (cpu_online(cpu) || c->hotpluggable) { + register_cpu(c, cpu); + + sysdev_create_file(&c->sysdev, &attr_physical_id); + } + + if (cpu_online(cpu)) + register_cpu_online(cpu); + } +#ifdef CONFIG_PPC64 + sysfs_create_dscr_default(); +#endif /* CONFIG_PPC64 */ + + return 0; +} +subsys_initcall(topology_init); |