#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/hvcall.h>
#include <asm/prom.h>
+#include <asm/systemcfg.h>
+#include <asm/paca.h>
+#include <asm/lppaca.h>
-/* SMT stuff */
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
-#ifndef CONFIG_PPC_ISERIES
+/* SMT stuff */
+#ifdef CONFIG_PPC_MULTIPLATFORM
/* default to snooze disabled */
DEFINE_PER_CPU(unsigned long, smt_snooze_delay);
}
__setup("smt-snooze-delay=", setup_smt_snooze_delay);
-#endif
-
-
-/* PMC stuff */
-
/*
* 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);
-#ifdef CONFIG_PPC_ISERIES
-void ppc64_enable_pmcs(void)
-{
- /* XXX Implement for iseries */
-}
-#else
void ppc64_enable_pmcs(void)
{
unsigned long hid0;
+#ifdef CONFIG_PPC_PSERIES
unsigned long set, reset;
int ret;
unsigned int ctrl;
+#endif /* CONFIG_PPC_PSERIES */
/* Only need to enable them once */
if (__get_cpu_var(pmcs_enabled))
__get_cpu_var(pmcs_enabled) = 1;
switch (systemcfg->platform) {
- case PLATFORM_PSERIES:
- hid0 = mfspr(HID0);
- hid0 |= 1UL << (63 - 20);
-
- /* POWER4 requires the following sequence */
- asm volatile(
- "sync\n"
- "mtspr %1, %0\n"
- "mfspr %0, %1\n"
- "mfspr %0, %1\n"
- "mfspr %0, %1\n"
- "mfspr %0, %1\n"
- "mfspr %0, %1\n"
- "mfspr %0, %1\n"
- "isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0):
- "memory");
- break;
-
- case PLATFORM_PSERIES_LPAR:
- set = 1UL << 63;
- reset = 0;
- ret = plpar_hcall_norets(H_PERFMON, set, reset);
- if (ret)
- printk(KERN_ERR "H_PERFMON call returned %d",
- ret);
- break;
-
- default:
- break;
+ case PLATFORM_PSERIES:
+ case PLATFORM_POWERMAC:
+ hid0 = mfspr(HID0);
+ hid0 |= 1UL << (63 - 20);
+
+ /* POWER4 requires the following sequence */
+ asm volatile(
+ "sync\n"
+ "mtspr %1, %0\n"
+ "mfspr %0, %1\n"
+ "mfspr %0, %1\n"
+ "mfspr %0, %1\n"
+ "mfspr %0, %1\n"
+ "mfspr %0, %1\n"
+ "mfspr %0, %1\n"
+ "isync" : "=&r" (hid0) : "i" (HID0), "0" (hid0):
+ "memory");
+ break;
+
+#ifdef CONFIG_PPC_PSERIES
+ case PLATFORM_PSERIES_LPAR:
+ set = 1UL << 63;
+ reset = 0;
+ ret = plpar_hcall_norets(H_PERFMON, set, reset);
+ if (ret)
+ printk(KERN_ERR "H_PERFMON call on cpu %u "
+ "returned %d\n",
+ smp_processor_id(), ret);
+ break;
+#endif /* CONFIG_PPC_PSERIES */
+
+ default:
+ break;
}
+#ifdef CONFIG_PPC_PSERIES
/* instruct hypervisor to maintain PMCs */
- if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR) {
- char *ptr = (char *)&paca[smp_processor_id()].xLpPaca;
- ptr[0xBB] = 1;
- }
+ if (cur_cpu_spec->firmware_features & FW_FEATURE_SPLPAR)
+ get_paca()->lppaca.pmcregs_in_use = 1;
/*
* On SMT machines we have to set the run latch in the ctrl register
ctrl |= RUNLATCH;
mtspr(CTRLT, ctrl);
}
+#endif /* CONFIG_PPC_PSERIES */
}
-#endif
+
+#else
+
+/* PMC stuff */
+void ppc64_enable_pmcs(void)
+{
+ /* XXX Implement for iseries */
+}
+#endif /* CONFIG_PPC_MULTIPLATFORM */
+
+EXPORT_SYMBOL(ppc64_enable_pmcs);
/* XXX convert to rusty's on_one_cpu */
static unsigned long run_on_cpu(unsigned long cpu,
unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
return sprintf(buf, "%lx\n", val); \
} \
-static ssize_t store_##NAME(struct sys_device *dev, const char *buf, \
- size_t count) \
+static ssize_t __attribute_used__ \
+ store_##NAME(struct sys_device *dev, const char *buf, size_t count) \
{ \
struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
unsigned long val; \
static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
-static void __init register_cpu_pmc(struct sys_device *s)
+static void register_cpu_online(unsigned int cpu)
{
+ struct cpu *c = &per_cpu(cpu_devices, cpu);
+ struct sys_device *s = &c->sysdev;
+
+#ifndef CONFIG_PPC_ISERIES
+ if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
+ sysdev_create_file(s, &attr_smt_snooze_delay);
+#endif
+
+ /* PMC stuff */
+
sysdev_create_file(s, &attr_mmcr0);
sysdev_create_file(s, &attr_mmcr1);
sysdev_create_file(s, &attr_purr);
}
+#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;
+
+ BUG_ON(c->no_control);
+
+#ifndef CONFIG_PPC_ISERIES
+ if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
+ sysdev_remove_file(s, &attr_smt_snooze_delay);
+#endif
+
+ /* PMC stuff */
+
+ sysdev_remove_file(s, &attr_mmcr0);
+ sysdev_remove_file(s, &attr_mmcr1);
+
+ if (cur_cpu_spec->cpu_features & CPU_FTR_MMCRA)
+ sysdev_remove_file(s, &attr_mmcra);
+
+ sysdev_remove_file(s, &attr_pmc1);
+ sysdev_remove_file(s, &attr_pmc2);
+ sysdev_remove_file(s, &attr_pmc3);
+ sysdev_remove_file(s, &attr_pmc4);
+ sysdev_remove_file(s, &attr_pmc5);
+ sysdev_remove_file(s, &attr_pmc6);
+
+ if (cur_cpu_spec->cpu_features & CPU_FTR_PMC8) {
+ sysdev_remove_file(s, &attr_pmc7);
+ sysdev_remove_file(s, &attr_pmc8);
+ }
+
+ if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
+ sysdev_remove_file(s, &attr_purr);
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+static int __devinit sysfs_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned int)(long)hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ register_cpu_online(cpu);
+ break;
+#ifdef CONFIG_HOTPLUG_CPU
+ case CPU_DEAD:
+ unregister_cpu_online(cpu);
+ break;
+#endif
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __devinitdata sysfs_cpu_nb = {
+ .notifier_call = sysfs_cpu_notify,
+};
/* NUMA stuff */
}
#endif
-
-/* Only valid if CPU is online. */
+/* Only valid if CPU is present. */
static ssize_t show_physical_id(struct sys_device *dev, char *buf)
{
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
- return sprintf(buf, "%u\n", get_hard_smp_processor_id(cpu->sysdev.id));
+ return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->sysdev.id));
}
static SYSDEV_ATTR(physical_id, 0444, show_physical_id, NULL);
-
-static DEFINE_PER_CPU(struct cpu, cpu_devices);
-
static int __init topology_init(void)
{
int cpu;
register_nodes();
+ register_cpu_notifier(&sysfs_cpu_nb);
+
for_each_cpu(cpu) {
struct cpu *c = &per_cpu(cpu_devices, cpu);
#ifdef CONFIG_NUMA
parent = &node_devices[cpu_to_node(cpu)];
#endif
- register_cpu(c, cpu, parent);
+ /*
+ * 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.
+ */
+#ifdef CONFIG_HOTPLUG_CPU
+ if (systemcfg->platform != PLATFORM_PSERIES_LPAR)
+#endif
+ c->no_control = 1;
- register_cpu_pmc(&c->sysdev);
+ if (cpu_online(cpu) || (c->no_control == 0)) {
+ register_cpu(c, cpu, parent);
- sysdev_create_file(&c->sysdev, &attr_physical_id);
+ sysdev_create_file(&c->sysdev, &attr_physical_id);
+ }
-#ifndef CONFIG_PPC_ISERIES
- if (cur_cpu_spec->cpu_features & CPU_FTR_SMT)
- sysdev_create_file(&c->sysdev, &attr_smt_snooze_delay);
-#endif
+ if (cpu_online(cpu))
+ register_cpu_online(cpu);
}
return 0;
git://git.onelab.eu / linux-2.6.git / blobdiff