#include <linux/config.h>
#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/hvcall.h>
#include <asm/prom.h>
#include <asm/systemcfg.h>
#include <asm/paca.h>
#include <asm/lppaca.h>
#include <asm/machdep.h>
static DEFINE_PER_CPU(struct cpu, cpu_devices);
/* SMT stuff */
#ifdef CONFIG_PPC_MULTIPLATFORM
/* default to snooze disabled */
DEFINE_PER_CPU(unsigned long, smt_snooze_delay);
static ssize_t store_smt_snooze_delay(struct sys_device *dev, const char *buf,
size_t count)
{
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
ssize_t ret;
unsigned long snooze;
ret = sscanf(buf, "%lu", &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, char *buf)
{
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
}
static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
store_smt_snooze_delay);
/* Only parse OF options if the matching cmdline option was not specified */
static int smt_snooze_cmdline;
static int __init smt_setup(void)
{
struct device_node *options;
unsigned int *val;
unsigned int cpu;
if (!cpu_has_feature(CPU_FTR_SMT))
return 1;
options = find_path_device("/options");
if (!options)
return 1;
val = (unsigned int *)get_property(options, "ibm,smt-snooze-delay",
NULL);
if (!smt_snooze_cmdline && val) {
for_each_cpu(cpu)
per_cpu(smt_snooze_delay, cpu) = *val;
}
return 1;
}
__initcall(smt_setup);
static int __init setup_smt_snooze_delay(char *str)
{
unsigned int cpu;
int snooze;
if (!cpu_has_feature(CPU_FTR_SMT))
return 1;
smt_snooze_cmdline = 1;
if (get_option(&str, &snooze)) {
for_each_cpu(cpu)
per_cpu(smt_snooze_delay, cpu) = snooze;
}
return 1;
}
__setup("smt-snooze-delay=", setup_smt_snooze_delay);
/*
* 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 ppc64_enable_pmcs(void)
{
unsigned long hid0;
#ifdef CONFIG_PPC_PSERIES
unsigned long set, reset;
int ret;
#endif /* CONFIG_PPC_PSERIES */
/* Only need to enable them once */
if (__get_cpu_var(pmcs_enabled))
return;
__get_cpu_var(pmcs_enabled) = 1;
switch (systemcfg->platform) {
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)
get_paca()->lppaca.pmcregs_in_use = 1;
/*
* On SMT machines we have to set the run latch in the ctrl register
* in order to make PMC6 spin.
*/
if (cpu_has_feature(CPU_FTR_SMT))
ppc64_runlatch_on();
#endif /* CONFIG_PPC_PSERIES */
}
#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 (*func)(unsigned long),
unsigned long arg)
{
cpumask_t old_affinity = current->cpus_allowed;
unsigned long ret;
/* should return -EINVAL to userspace */
if (set_cpus_allowed(current, cpumask_of_cpu(cpu)))
return 0;
ret = func(arg);
set_cpus_allowed(current, old_affinity);
return ret;
}
#define SYSFS_PMCSETUP(NAME, ADDRESS) \
static unsigned long read_##NAME(unsigned long junk) \
{ \
return mfspr(ADDRESS); \
} \
static unsigned long write_##NAME(unsigned long val) \
{ \
ppc64_enable_pmcs(); \
mtspr(ADDRESS, val); \
return 0; \
} \
static ssize_t show_##NAME(struct sys_device *dev, char *buf) \
{ \
struct cpu *cpu = container_of(dev, struct cpu, sysdev); \
unsigned long val = run_on_cpu(cpu->sysdev.id, read_##NAME, 0); \
return sprintf(buf, "%lx\n", val); \
} \
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; \
int ret = sscanf(buf, "%lx", &val); \
if (ret != 1) \
return -EINVAL; \
run_on_cpu(cpu->sysdev.id, write_##NAME, val); \
return count; \
}
SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
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);
SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
SYSFS_PMCSETUP(purr, SPRN_PURR);
static SYSDEV_ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0);
static SYSDEV_ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1);
static SYSDEV_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
static SYSDEV_ATTR(pmc1, 0600, show_pmc1, store_pmc1);
static SYSDEV_ATTR(pmc2, 0600, show_pmc2, store_pmc2);
static SYSDEV_ATTR(pmc3, 0600, show_pmc3, store_pmc3);
static SYSDEV_ATTR(pmc4, 0600, show_pmc4, store_pmc4);
static SYSDEV_ATTR(pmc5, 0600, show_pmc5, store_pmc5);
static SYSDEV_ATTR(pmc6, 0600, show_pmc6, store_pmc6);
static SYSDEV_ATTR(pmc7, 0600, show_pmc7, store_pmc7);
static SYSDEV_ATTR(pmc8, 0600, show_pmc8, store_pmc8);
static SYSDEV_ATTR(purr, 0600, show_purr, NULL);
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 (cpu_has_feature(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);
if (cpu_has_feature(CPU_FTR_MMCRA))
sysdev_create_file(s, &attr_mmcra);
sysdev_create_file(s, &attr_pmc1);
sysdev_create_file(s, &attr_pmc2);
sysdev_create_file(s, &attr_pmc3);
sysdev_create_file(s, &attr_pmc4);
sysdev_create_file(s, &attr_pmc5);
sysdev_create_file(s, &attr_pmc6);
if (cpu_has_feature(CPU_FTR_PMC8)) {
sysdev_create_file(s, &attr_pmc7);
sysdev_create_file(s, &attr_pmc8);
}
if (cpu_has_feature(CPU_FTR_SMT))
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 (cpu_has_feature(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 (cpu_has_feature(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 (cpu_has_feature(CPU_FTR_PMC8)) {
sysdev_remove_file(s, &attr_pmc7);
sysdev_remove_file(s, &attr_pmc8);
}
if (cpu_has_feature(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 */
#ifdef CONFIG_NUMA
static struct node node_devices[MAX_NUMNODES];
static void register_nodes(void)
{
int i;
for (i = 0; i < MAX_NUMNODES; i++) {
if (node_online(i)) {
int p_node = parent_node(i);
struct node *parent = NULL;
if (p_node != i)
parent = &node_devices[p_node];
register_node(&node_devices[i], i, parent);
}
}
}
#else
static void register_nodes(void)
{
return;
}
#endif
/* 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, "%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;
struct node *parent = NULL;
register_nodes();
register_cpu_notifier(&sysfs_cpu_nb);
for_each_cpu(cpu) {
struct cpu *c = &per_cpu(cpu_devices, cpu);
#ifdef CONFIG_NUMA
/* The node to which a cpu belongs can't be known
* until the cpu is made present.
*/
parent = NULL;
if (cpu_present(cpu))
parent = &node_devices[cpu_to_node(cpu)];
#endif
/*
* 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->no_control = 1;
if (cpu_online(cpu) || (c->no_control == 0)) {
register_cpu(c, cpu, parent);
sysdev_create_file(&c->sysdev, &attr_physical_id);
}
if (cpu_online(cpu))
register_cpu_online(cpu);
}
return 0;
}
__initcall(topology_init);
