forked from Minki/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
432 lines
9.9 KiB
C
432 lines
9.9 KiB
C
#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;
|
|
unsigned int ctrl;
|
|
#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)) {
|
|
ctrl = mfspr(CTRLF);
|
|
ctrl |= RUNLATCH;
|
|
mtspr(CTRLT, ctrl);
|
|
}
|
|
#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
|
|
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);
|