path: root/arch/powerpc/kernel/sysfs.c

#include <linux/device.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/percpu.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/export.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/machdep.h>
#include <asm/smp.h>
#include <asm/pmc.h>
#include <asm/firmware.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 device *dev,
				      struct device_attribute *attr,
				      const char *buf,
				      size_t count)
{
	struct cpu *cpu = container_of(dev, struct cpu, dev);
	ssize_t ret;
	long snooze;

	ret = sscanf(buf, "%ld", &snooze);
	if (ret != 1)
		return -EINVAL;

	per_cpu(smt_snooze_delay, cpu->dev.id) = snooze;
	return count;
}

static ssize_t show_smt_snooze_delay(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct cpu *cpu = container_of(dev, struct cpu, dev);

	return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->dev.id));
}

static DEVICE_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 */

#ifdef CONFIG_PPC_FSL_BOOK3E
#define MAX_BIT				63

static u64 pw20_wt;
static u64 altivec_idle_wt;

static unsigned int get_idle_ticks_bit(u64 ns)
{
	u64 cycle;

	if (ns >= 10000)
		cycle = div_u64(ns + 500, 1000) * tb_ticks_per_usec;
	else
		cycle = div_u64(ns * tb_ticks_per_usec, 1000);

	if (!cycle)
		return 0;

	return ilog2(cycle);
}

static void do_show_pwrmgtcr0(void *val)
{
	u32 *value = val;

	*value = mfspr(SPRN_PWRMGTCR0);
}

static ssize_t show_pw20_state(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	u32 value;
	unsigned int cpu = dev->id;

	smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1);

	value &= PWRMGTCR0_PW20_WAIT;

	return sprintf(buf, "%u\n", value ? 1 : 0);
}

static void do_store_pw20_state(void *val)
{
	u32 *value = val;
	u32 pw20_state;

	pw20_state = mfspr(SPRN_PWRMGTCR0);

	if (*value)
		pw20_state |= PWRMGTCR0_PW20_WAIT;
	else
		pw20_state &= ~PWRMGTCR0_PW20_WAIT;

	mtspr(SPRN_PWRMGTCR0, pw20_state);
}

static ssize_t store_pw20_state(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	u32 value;
	unsigned int cpu = dev->id;

	if (kstrtou32(buf, 0, &value))
		return -EINVAL;

	if (value > 1)
		return -EINVAL;

	smp_call_function_single(cpu, do_store_pw20_state, &value, 1);

	return count;
}

static ssize_t show_pw20_wait_time(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	u32 value