arch/powerpc/kernel/sysfs.c

root/arch/powerpc/kernel/sysfs.c
// SPDX-License-Identifier: GPL-2.0-only
#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 <linux/of.h>

#include <asm/current.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/hvcall.h>
#include <asm/machdep.h>
#include <asm/smp.h>
#include <asm/time.h>
#include <asm/pmc.h>
#include <asm/firmware.h>
#include <asm/idle.h>
#include <asm/svm.h>

#include "cacheinfo.h"
#include "setup.h"

#ifdef CONFIG_PPC64
#include <asm/paca.h>
#include <asm/lppaca.h>
#endif

static DEFINE_PER_CPU(struct cpu, cpu_devices);

#ifdef CONFIG_PPC64

/*
 * Snooze delay has not been hooked up since 3fa8cad82b94 ("powerpc/pseries/cpuidle:
 * smt-snooze-delay cleanup.") and has been broken even longer. As was foretold in
 * 2014:
 *
 *  "ppc64_util currently utilises it. Once we fix ppc64_util, propose to clean
 *  up the kernel code."
 *
 * powerpc-utils stopped using it as of 1.3.8. At some point in the future this
 * code should be removed.
 */

static ssize_t store_smt_snooze_delay(struct device *dev,
                                      struct device_attribute *attr,
                                      const char *buf,
                                      size_t count)
{
        pr_warn_once("%s (%d) stored to unsupported smt_snooze_delay, which has no effect.\n",
                     current->comm, current->pid);
        return count;
}

static ssize_t show_smt_snooze_delay(struct device *dev,
                                     struct device_attribute *attr,
                                     char *buf)
{
        pr_warn_once("%s (%d) read from unsupported smt_snooze_delay\n",
                     current->comm, current->pid);
        return sprintf(buf, "100\n");
}

static DEVICE_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
                   store_smt_snooze_delay);

static int __init setup_smt_snooze_delay(char *str)
{
        if (!cpu_has_feature(CPU_FTR_SMT))
                return 1;

        pr_warn("smt-snooze-delay command line option has no effect\n");
        return 1;
}
__setup("smt-snooze-delay=", setup_smt_snooze_delay);

#endif /* CONFIG_PPC64 */

#define __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, EXTRA) \
static void read_##NAME(void *val) \
{ \
        *(unsigned long *)val = mfspr(ADDRESS); \
} \
static void write_##NAME(void *val) \
{ \
        EXTRA; \
        mtspr(ADDRESS, *(unsigned long *)val);  \
}

#define __SYSFS_SPRSETUP_SHOW_STORE(NAME) \
static ssize_t show_##NAME(struct device *dev, \
                        struct device_attribute *attr, \
                        char *buf) \
{ \
        struct cpu *cpu = container_of(dev, struct cpu, dev); \
        unsigned long val; \
        smp_call_function_single(cpu->dev.id, read_##NAME, &val, 1);    \
        return sprintf(buf, "%lx\n", val); \
} \
static ssize_t __used \
        store_##NAME(struct device *dev, struct device_attribute *attr, \
                        const char *buf, size_t count) \
{ \
        struct cpu *cpu = container_of(dev, struct cpu, dev); \
        unsigned long val; \
        int ret = sscanf(buf, "%lx", &val); \
        if (ret != 1) \
                return -EINVAL; \
        smp_call_function_single(cpu->dev.id, write_##NAME, &val, 1); \
        return count; \
}

#define SYSFS_PMCSETUP(NAME, ADDRESS) \
        __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, ppc_enable_pmcs()) \
        __SYSFS_SPRSETUP_SHOW_STORE(NAME)
#define SYSFS_SPRSETUP(NAME, ADDRESS) \
        __SYSFS_SPRSETUP_READ_WRITE(NAME, ADDRESS, ) \
        __SYSFS_SPRSETUP_SHOW_STORE(NAME)

#define SYSFS_SPRSETUP_SHOW_STORE(NAME) \
        __SYSFS_SPRSETUP_SHOW_STORE(NAME)

#ifdef CONFIG_PPC64

/*
 * This is the system wide DSCR register default value. Any
 * change to this default value through the sysfs interface
 * will update all per cpu DSCR default values across the
 * system stored in their respective PACA structures.
 */
static unsigned long dscr_default;

/**
 * read_dscr() - Fetch the cpu specific DSCR default
 * @val:        Returned cpu specific DSCR default value
 *
 * This function returns the per cpu DSCR default value
 * for any cpu which is contained in its PACA structure.
 */
static void read_dscr(void *val)
{
        *(unsigned long *)val = get_paca()->dscr_default;
}


/**
 * write_dscr() - Update the cpu specific DSCR default
 * @val:        New cpu specific DSCR default value to update
 *
 * This function updates the per cpu DSCR default value
 * for any cpu which is contained in its PACA structure.
 */
static void write_dscr(void *val)
{
        get_paca()->dscr_default = *(unsigned long *)val;
        if (!current->thread.dscr_inherit) {
                current->thread.dscr = *(unsigned long *)val;
                mtspr(SPRN_DSCR, *(unsigned long *)val);
        }
}

SYSFS_SPRSETUP_SHOW_STORE(dscr);
static DEVICE_ATTR(dscr, 0600, show_dscr, store_dscr);

static void add_write_permission_dev_attr(struct device_attribute *attr)
{
        attr->attr.mode |= 0200;
}

/**
 * show_dscr_default() - Fetch the system wide DSCR default
 * @dev:        Device structure
 * @attr:       Device attribute structure
 * @buf:        Interface buffer
 *
 * This function returns the system wide DSCR default value.
 */
static ssize_t show_dscr_default(struct device *dev,
                struct device_attribute *attr, char *buf)
{
        return sprintf(buf, "%lx\n", dscr_default);
}

/**
 * store_dscr_default() - Update the system wide DSCR default
 * @dev:        Device structure
 * @attr:       Device attribute structure
 * @buf:        Interface buffer
 * @count:      Size of the update
 *
 * This function updates the system wide DSCR default value.
 */
static ssize_t __used store_dscr_default(struct device *dev,
                struct device_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;

        on_each_cpu(write_dscr, &val, 1);

        return count;
}

static DEVICE_ATTR(dscr_default, 0600,
                show_dscr_default, store_dscr_default);

static void __init sysfs_create_dscr_default(void)
{
        if (cpu_has_feature(CPU_FTR_DSCR)) {
                struct device *dev_root;
                int cpu;

                dscr_default = spr_default_dscr;
                for_each_possible_cpu(cpu)
                        paca_ptrs[cpu]->dscr_default = dscr_default;

                dev_root = bus_get_dev_root(&cpu_subsys);
                if (dev_root) {
                        device_create_file(dev_root, &dev_attr_dscr_default);
                        put_device(dev_root);
                }
        }
}
#endif /* CONFIG_PPC64 */

#ifdef CONFIG_PPC_E500
#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;
        u64 tb_cycle = 1;
        u64 time;

        unsigned int cpu = dev->id;

        if (!pw20_wt) {
                smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1);
                value = (value & PWRMGTCR0_PW20_ENT) >>
                                        PWRMGTCR0_PW20_ENT_SHIFT;

                tb_cycle = (tb_cycle << (MAX_BIT - value + 1));
                /* convert ms to ns */
                if (tb_ticks_per_usec > 1000) {
                        time = div_u64(tb_cycle, tb_ticks_per_usec / 1000);
                } else {
                        u32 rem_us;

                        time = div_u64_rem(tb_cycle, tb_ticks_per_usec,
                                                &rem_us);
                        time = time * 1000 + rem_us * 1000 / tb_ticks_per_usec;
                }
        } else {
                time = pw20_wt;
        }

        return sprintf(buf, "%llu\n", time > 0 ? time : 0);
}

static void set_pw20_wait_entry_bit(void *val)
{
        u32 *value = val;
        u32 pw20_idle;

        pw20_idle = mfspr(SPRN_PWRMGTCR0);

        /* Set Automatic PW20 Core Idle Count */
        /* clear count */
        pw20_idle &= ~PWRMGTCR0_PW20_ENT;

        /* set count */
        pw20_idle |= ((MAX_BIT - *value) << PWRMGTCR0_PW20_ENT_SHIFT);

        mtspr(SPRN_PWRMGTCR0, pw20_idle);
}

static ssize_t store_pw20_wait_time(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t count)
{
        u32 entry_bit;
        u64 value;

        unsigned int cpu = dev->id;

        if (kstrtou64(buf, 0, &value))
                return -EINVAL;

        if (!value)
                return -EINVAL;

        entry_bit = get_idle_ticks_bit(value);
        if (entry_bit > MAX_BIT)
                return -EINVAL;

        pw20_wt = value;

        smp_call_function_single(cpu, set_pw20_wait_entry_bit,
                                &entry_bit, 1);

        return count;
}

static ssize_t show_altivec_idle(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_AV_IDLE_PD_EN;

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

static void do_store_altivec_idle(void *val)
{
        u32 *value = val;
        u32 altivec_idle;

        altivec_idle = mfspr(SPRN_PWRMGTCR0);

        if (*value)
                altivec_idle |= PWRMGTCR0_AV_IDLE_PD_EN;
        else
                altivec_idle &= ~PWRMGTCR0_AV_IDLE_PD_EN;

        mtspr(SPRN_PWRMGTCR0, altivec_idle);
}

static ssize_t store_altivec_idle(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_altivec_idle, &value, 1);

        return count;
}

static ssize_t show_altivec_idle_wait_time(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        u32 value;
        u64 tb_cycle = 1;
        u64 time;

        unsigned int cpu = dev->id;

        if (!altivec_idle_wt) {
                smp_call_function_single(cpu, do_show_pwrmgtcr0, &value, 1);
                value = (value & PWRMGTCR0_AV_IDLE_CNT) >>
                                        PWRMGTCR0_AV_IDLE_CNT_SHIFT;

                tb_cycle = (tb_cycle << (MAX_BIT - value + 1));
                /* convert ms to ns */
                if (tb_ticks_per_usec > 1000) {
                        time = div_u64(tb_cycle, tb_ticks_per_usec / 1000);
                } else {
                        u32 rem_us;

                        time = div_u64_rem(tb_cycle, tb_ticks_per_usec,
                                                &rem_us);
                        time = time * 1000 + rem_us * 1000 / tb_ticks_per_usec;
                }
        } else {
                time = altivec_idle_wt;
        }

        return sprintf(buf, "%llu\n", time > 0 ? time : 0);
}

static void set_altivec_idle_wait_entry_bit(void *val)
{
        u32 *value = val;
        u32 altivec_idle;

        altivec_idle = mfspr(SPRN_PWRMGTCR0);

        /* Set Automatic AltiVec Idle Count */
        /* clear count */
        altivec_idle &= ~PWRMGTCR0_AV_IDLE_CNT;

        /* set count */
        altivec_idle |= ((MAX_BIT - *value) << PWRMGTCR0_AV_IDLE_CNT_SHIFT);

        mtspr(SPRN_PWRMGTCR0, altivec_idle);
}

static ssize_t store_altivec_idle_wait_time(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t count)
{
        u32 entry_bit;
        u64 value;

        unsigned int cpu = dev->id;

        if (kstrtou64(buf, 0, &value))
                return -EINVAL;

        if (!value)
                return -EINVAL;

        entry_bit = get_idle_ticks_bit(value);
        if (entry_bit > MAX_BIT)
                return -EINVAL;

        altivec_idle_wt = value;

        smp_call_function_single(cpu, set_altivec_idle_wait_entry_bit,
                                &entry_bit, 1);

        return count;
}

/*
 * Enable/Disable interface:
 * 0, disable. 1, enable.
 */
static DEVICE_ATTR(pw20_state, 0600, show_pw20_state, store_pw20_state);
static DEVICE_ATTR(altivec_idle, 0600, show_altivec_idle, store_altivec_idle);

/*
 * Set wait time interface:(Nanosecond)
 * Example: Base on TBfreq is 41MHZ.
 * 1~48(ns): TB[63]
 * 49~97(ns): TB[62]
 * 98~195(ns): TB[61]
 * 196~390(ns): TB[60]
 * 391~780(ns): TB[59]
 * 781~1560(ns): TB[58]
 * ...
 */
static DEVICE_ATTR(pw20_wait_time, 0600,
                        show_pw20_wait_time,
                        store_pw20_wait_time);
static DEVICE_ATTR(altivec_idle_wait_time, 0600,
                        show_altivec_idle_wait_time,
                        store_altivec_idle_wait_time);
#endif

/*
 * 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 (__this_cpu_read(pmcs_enabled))
                return;

        __this_cpu_write(pmcs_enabled, 1);

        if (ppc_md.enable_pmcs)
                ppc_md.enable_pmcs();
}
EXPORT_SYMBOL(ppc_enable_pmcs);



/* Let's define all possible registers, we'll only hook up the ones
 * that are implemented on the current processor
 */

#ifdef CONFIG_PMU_SYSFS
#if defined(CONFIG_PPC64) || defined(CONFIG_PPC_BOOK3S_32)
#define HAS_PPC_PMC_CLASSIC     1
#define HAS_PPC_PMC_IBM         1
#endif

#ifdef CONFIG_PPC64
#define HAS_PPC_PMC_PA6T        1
#define HAS_PPC_PMC56          1
#endif

#ifdef CONFIG_PPC_BOOK3S_32
#define HAS_PPC_PMC_G4          1
#endif
#endif /* CONFIG_PMU_SYSFS */

#if defined(CONFIG_PPC64) && defined(CONFIG_DEBUG_MISC)
#define HAS_PPC_PA6T
#endif
/*
 * SPRs which are not related to PMU.
 */
#ifdef CONFIG_PPC64
SYSFS_SPRSETUP(purr, SPRN_PURR);
SYSFS_SPRSETUP(spurr, SPRN_SPURR);
SYSFS_SPRSETUP(pir, SPRN_PIR);
SYSFS_SPRSETUP(tscr, SPRN_TSCR);

/*
  Lets only enable read for phyp resources and
  enable write when needed with a separate function.
  Lets be conservative and default to pseries.
*/
static DEVICE_ATTR(spurr, 0400, show_spurr, NULL);
static DEVICE_ATTR(purr, 0400, show_purr, store_purr);
static DEVICE_ATTR(pir, 0400, show_pir, NULL);
static DEVICE_ATTR(tscr, 0600, show_tscr, store_tscr);
#endif /* CONFIG_PPC64 */

#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);
#endif

#ifdef HAS_PPC_PMC_G4
SYSFS_PMCSETUP(mmcr2, SPRN_MMCR2);
#endif

#ifdef HAS_PPC_PMC56
SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
SYSFS_PMCSETUP(pmc8, SPRN_PMC8);

SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
SYSFS_PMCSETUP(mmcr3, SPRN_MMCR3);

static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
static DEVICE_ATTR(mmcr3, 0600, show_mmcr3, store_mmcr3);
#endif /* HAS_PPC_PMC56 */




#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);
#endif

#ifdef HAS_PPC_PA6T
SYSFS_SPRSETUP(hid0, SPRN_HID0);
SYSFS_SPRSETUP(hid1, SPRN_HID1);
SYSFS_SPRSETUP(hid4, SPRN_HID4);
SYSFS_SPRSETUP(hid5, SPRN_HID5);
SYSFS_SPRSETUP(ima0, SPRN_PA6T_IMA0);
SYSFS_SPRSETUP(ima1, SPRN_PA6T_IMA1);
SYSFS_SPRSETUP(ima2, SPRN_PA6T_IMA2);
SYSFS_SPRSETUP(ima3, SPRN_PA6T_IMA3);
SYSFS_SPRSETUP(ima4, SPRN_PA6T_IMA4);
SYSFS_SPRSETUP(ima5, SPRN_PA6T_IMA5);
SYSFS_SPRSETUP(ima6, SPRN_PA6T_IMA6);
SYSFS_SPRSETUP(ima7, SPRN_PA6T_IMA7);
SYSFS_SPRSETUP(ima8, SPRN_PA6T_IMA8);
SYSFS_SPRSETUP(ima9, SPRN_PA6T_IMA9);
SYSFS_SPRSETUP(imaat, SPRN_PA6T_IMAAT);
SYSFS_SPRSETUP(btcr, SPRN_PA6T_BTCR);
SYSFS_SPRSETUP(pccr, SPRN_PA6T_PCCR);
SYSFS_SPRSETUP(rpccr, SPRN_PA6T_RPCCR);
SYSFS_SPRSETUP(der, SPRN_PA6T_DER);
SYSFS_SPRSETUP(mer, SPRN_PA6T_MER);
SYSFS_SPRSETUP(ber, SPRN_PA6T_BER);
SYSFS_SPRSETUP(ier, SPRN_PA6T_IER);
SYSFS_SPRSETUP(sier, SPRN_PA6T_SIER);
SYSFS_SPRSETUP(siar, SPRN_PA6T_SIAR);
SYSFS_SPRSETUP(tsr0, SPRN_PA6T_TSR0);
SYSFS_SPRSETUP(tsr1, SPRN_PA6T_TSR1);
SYSFS_SPRSETUP(tsr2, SPRN_PA6T_TSR2);
SYSFS_SPRSETUP(tsr3, SPRN_PA6T_TSR3);
#endif /* HAS_PPC_PA6T */

#ifdef HAS_PPC_PMC_IBM
static struct device_attribute ibm_common_attrs[] = {
        __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
        __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
};
#endif /* HAS_PPC_PMC_IBM */

#ifdef HAS_PPC_PMC_G4
static struct device_attribute g4_common_attrs[] = {
        __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
        __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
        __ATTR(mmcr2, 0600, show_mmcr2, store_mmcr2),
};
#endif /* HAS_PPC_PMC_G4 */

#ifdef HAS_PPC_PMC_CLASSIC
static struct device_attribute classic_pmc_attrs[] = {
        __ATTR(pmc1, 0600, show_pmc1, store_pmc1),
        __ATTR(pmc2, 0600, show_pmc2, store_pmc2),
        __ATTR(pmc3, 0600, show_pmc3, store_pmc3),
        __ATTR(pmc4, 0600, show_pmc4, store_pmc4),
        __ATTR(pmc5, 0600, show_pmc5, store_pmc5),
        __ATTR(pmc6, 0600, show_pmc6, store_pmc6),
#ifdef HAS_PPC_PMC56
        __ATTR(pmc7, 0600, show_pmc7, store_pmc7),
        __ATTR(pmc8, 0600, show_pmc8, store_pmc8),
#endif
};
#endif

#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T)
static struct device_attribute pa6t_attrs[] = {
#ifdef HAS_PPC_PMC_PA6T
        __ATTR(mmcr0, 0600, show_mmcr0, store_mmcr0),
        __ATTR(mmcr1, 0600, show_mmcr1, store_mmcr1),
        __ATTR(pmc0, 0600, show_pa6t_pmc0, store_pa6t_pmc0),
        __ATTR(pmc1, 0600, show_pa6t_pmc1, store_pa6t_pmc1),
        __ATTR(pmc2, 0600, show_pa6t_pmc2, store_pa6t_pmc2),
        __ATTR(pmc3, 0600, show_pa6t_pmc3, store_pa6t_pmc3),
        __ATTR(pmc4, 0600, show_pa6t_pmc4, store_pa6t_pmc4),
        __ATTR(pmc5, 0600, show_pa6t_pmc5, store_pa6t_pmc5),
#endif
#ifdef HAS_PPC_PA6T
        __ATTR(hid0, 0600, show_hid0, store_hid0),
        __ATTR(hid1, 0600, show_hid1, store_hid1),
        __ATTR(hid4, 0600, show_hid4, store_hid4),
        __ATTR(hid5, 0600, show_hid5, store_hid5),
        __ATTR(ima0, 0600, show_ima0, store_ima0),
        __ATTR(ima1, 0600, show_ima1, store_ima1),
        __ATTR(ima2, 0600, show_ima2, store_ima2),
        __ATTR(ima3, 0600, show_ima3, store_ima3),
        __ATTR(ima4, 0600, show_ima4, store_ima4),
        __ATTR(ima5, 0600, show_ima5, store_ima5),
        __ATTR(ima6, 0600, show_ima6, store_ima6),
        __ATTR(ima7, 0600, show_ima7, store_ima7),
        __ATTR(ima8, 0600, show_ima8, store_ima8),
        __ATTR(ima9, 0600, show_ima9, store_ima9),
        __ATTR(imaat, 0600, show_imaat, store_imaat),
        __ATTR(btcr, 0600, show_btcr, store_btcr),
        __ATTR(pccr, 0600, show_pccr, store_pccr),
        __ATTR(rpccr, 0600, show_rpccr, store_rpccr),
        __ATTR(der, 0600, show_der, store_der),
        __ATTR(mer, 0600, show_mer, store_mer),
        __ATTR(ber, 0600, show_ber, store_ber),
        __ATTR(ier, 0600, show_ier, store_ier),
        __ATTR(sier, 0600, show_sier, store_sier),
        __ATTR(siar, 0600, show_siar, store_siar),
        __ATTR(tsr0, 0600, show_tsr0, store_tsr0),
        __ATTR(tsr1, 0600, show_tsr1, store_tsr1),
        __ATTR(tsr2, 0600, show_tsr2, store_tsr2),
        __ATTR(tsr3, 0600, show_tsr3, store_tsr3),
#endif /* HAS_PPC_PA6T */
};
#endif

#ifdef CONFIG_PPC_SVM
static ssize_t show_svm(struct device *dev, struct device_attribute *attr, char *buf)
{
        return sprintf(buf, "%u\n", is_secure_guest());
}
static DEVICE_ATTR(svm, 0444, show_svm, NULL);

static void __init create_svm_file(void)
{
        struct device *dev_root = bus_get_dev_root(&cpu_subsys);

        if (dev_root) {
                device_create_file(dev_root, &dev_attr_svm);
                put_device(dev_root);
        }
}
#else
static void __init create_svm_file(void)
{
}
#endif /* CONFIG_PPC_SVM */

#ifdef CONFIG_PPC_PSERIES
static void read_idle_purr(void *val)
{
        u64 *ret = val;

        *ret = read_this_idle_purr();
}

static ssize_t idle_purr_show(struct device *dev,
                              struct device_attribute *attr, char *buf)
{
        struct cpu *cpu = container_of(dev, struct cpu, dev);
        u64 val;

        smp_call_function_single(cpu->dev.id, read_idle_purr, &val, 1);
        return sprintf(buf, "%llx\n", val);
}
static DEVICE_ATTR(idle_purr, 0400, idle_purr_show, NULL);

static void create_idle_purr_file(struct device *s)
{
        if (firmware_has_feature(FW_FEATURE_LPAR))
                device_create_file(s, &dev_attr_idle_purr);
}

static void remove_idle_purr_file(struct device *s)
{
        if (firmware_has_feature(FW_FEATURE_LPAR))
                device_remove_file(s, &dev_attr_idle_purr);
}

static void read_idle_spurr(void *val)
{
        u64 *ret = val;

        *ret = read_this_idle_spurr();
}

static ssize_t idle_spurr_show(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
        struct cpu *cpu = container_of(dev, struct cpu, dev);
        u64 val;

        smp_call_function_single(cpu->dev.id, read_idle_spurr, &val, 1);
        return sprintf(buf, "%llx\n", val);
}
static DEVICE_ATTR(idle_spurr, 0400, idle_spurr_show, NULL);

static void create_idle_spurr_file(struct device *s)
{
        if (firmware_has_feature(FW_FEATURE_LPAR))
                device_create_file(s, &dev_attr_idle_spurr);
}

static void remove_idle_spurr_file(struct device *s)
{
        if (firmware_has_feature(FW_FEATURE_LPAR))
                device_remove_file(s, &dev_attr_idle_spurr);
}

#else /* CONFIG_PPC_PSERIES */
#define create_idle_purr_file(s)
#define remove_idle_purr_file(s)
#define create_idle_spurr_file(s)
#define remove_idle_spurr_file(s)
#endif /* CONFIG_PPC_PSERIES */

static int register_cpu_online(unsigned int cpu)
{
        struct cpu *c = &per_cpu(cpu_devices, cpu);
        struct device *s = &c->dev;
        struct device_attribute *attrs, *pmc_attrs;
        int i, nattrs;

        /* For cpus present at boot a reference was already grabbed in register_cpu() */
        if (!s->of_node)
                s->of_node = of_get_cpu_node(cpu, NULL);

#ifdef CONFIG_PPC64
        if (cpu_has_feature(CPU_FTR_SMT))
                device_create_file(s, &dev_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 = ARRAY_SIZE(ibm_common_attrs);
                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 = ARRAY_SIZE(g4_common_attrs);
                pmc_attrs = classic_pmc_attrs;
                break;
#endif /* HAS_PPC_PMC_G4 */
#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T)
        case PPC_PMC_PA6T:
                /* PA Semi starts counting at PMC0 */
                attrs = pa6t_attrs;
                nattrs = ARRAY_SIZE(pa6t_attrs);
                pmc_attrs = NULL;
                break;
#endif
        default:
                attrs = NULL;
                nattrs = 0;
                pmc_attrs = NULL;
        }

        for (i = 0; i < nattrs; i++)
                device_create_file(s, &attrs[i]);

        if (pmc_attrs)
                for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
                        device_create_file(s, &pmc_attrs[i]);

#ifdef CONFIG_PPC64
#ifdef  CONFIG_PMU_SYSFS
        if (cpu_has_feature(CPU_FTR_MMCRA))
                device_create_file(s, &dev_attr_mmcra);

        if (cpu_has_feature(CPU_FTR_ARCH_31))
                device_create_file(s, &dev_attr_mmcr3);
#endif /* CONFIG_PMU_SYSFS */

        if (cpu_has_feature(CPU_FTR_PURR)) {
                if (!firmware_has_feature(FW_FEATURE_LPAR))
                        add_write_permission_dev_attr(&dev_attr_purr);
                device_create_file(s, &dev_attr_purr);
                create_idle_purr_file(s);
        }

        if (cpu_has_feature(CPU_FTR_SPURR)) {
                device_create_file(s, &dev_attr_spurr);
                create_idle_spurr_file(s);
        }

        if (cpu_has_feature(CPU_FTR_DSCR))
                device_create_file(s, &dev_attr_dscr);

        if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
                device_create_file(s, &dev_attr_pir);

        if (cpu_has_feature(CPU_FTR_ARCH_206) &&
                !firmware_has_feature(FW_FEATURE_LPAR))
                device_create_file(s, &dev_attr_tscr);
#endif /* CONFIG_PPC64 */

#ifdef CONFIG_PPC_E500
        if (PVR_VER(cur_cpu_spec->pvr_value) == PVR_VER_E6500) {
                device_create_file(s, &dev_attr_pw20_state);
                device_create_file(s, &dev_attr_pw20_wait_time);

                device_create_file(s, &dev_attr_altivec_idle);
                device_create_file(s, &dev_attr_altivec_idle_wait_time);
        }
#endif
        cacheinfo_cpu_online(cpu);
        return 0;
}

#ifdef CONFIG_HOTPLUG_CPU
static int unregister_cpu_online(unsigned int cpu)
{
        struct cpu *c = &per_cpu(cpu_devices, cpu);
        struct device *s = &c->dev;
        struct device_attribute *attrs, *pmc_attrs;
        int i, nattrs;

        if (WARN_RATELIMIT(!c->hotpluggable, "cpu %d can't be offlined\n", cpu))
                return -EBUSY;

#ifdef CONFIG_PPC64
        if (cpu_has_feature(CPU_FTR_SMT))
                device_remove_file(s, &dev_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 = ARRAY_SIZE(ibm_common_attrs);
                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 = ARRAY_SIZE(g4_common_attrs);
                pmc_attrs = classic_pmc_attrs;
                break;
#endif /* HAS_PPC_PMC_G4 */
#if defined(HAS_PPC_PMC_PA6T) || defined(HAS_PPC_PA6T)
        case PPC_PMC_PA6T:
                /* PA Semi starts counting at PMC0 */
                attrs = pa6t_attrs;
                nattrs = ARRAY_SIZE(pa6t_attrs);
                pmc_attrs = NULL;
                break;
#endif
        default:
                attrs = NULL;
                nattrs = 0;
                pmc_attrs = NULL;
        }

        for (i = 0; i < nattrs; i++)
                device_remove_file(s, &attrs[i]);

        if (pmc_attrs)
                for (i = 0; i < cur_cpu_spec->num_pmcs; i++)
                        device_remove_file(s, &pmc_attrs[i]);

#ifdef CONFIG_PPC64
#ifdef CONFIG_PMU_SYSFS
        if (cpu_has_feature(CPU_FTR_MMCRA))
                device_remove_file(s, &dev_attr_mmcra);

        if (cpu_has_feature(CPU_FTR_ARCH_31))
                device_remove_file(s, &dev_attr_mmcr3);
#endif /* CONFIG_PMU_SYSFS */

        if (cpu_has_feature(CPU_FTR_PURR)) {
                device_remove_file(s, &dev_attr_purr);
                remove_idle_purr_file(s);
        }

        if (cpu_has_feature(CPU_FTR_SPURR)) {
                device_remove_file(s, &dev_attr_spurr);
                remove_idle_spurr_file(s);
        }

        if (cpu_has_feature(CPU_FTR_DSCR))
                device_remove_file(s, &dev_attr_dscr);

        if (cpu_has_feature(CPU_FTR_PPCAS_ARCH_V2))
                device_remove_file(s, &dev_attr_pir);

        if (cpu_has_feature(CPU_FTR_ARCH_206) &&
                !firmware_has_feature(FW_FEATURE_LPAR))
                device_remove_file(s, &dev_attr_tscr);
#endif /* CONFIG_PPC64 */

#ifdef CONFIG_PPC_E500
        if (PVR_VER(cur_cpu_spec->pvr_value) == PVR_VER_E6500) {
                device_remove_file(s, &dev_attr_pw20_state);
                device_remove_file(s, &dev_attr_pw20_wait_time);

                device_remove_file(s, &dev_attr_altivec_idle);
                device_remove_file(s, &dev_attr_altivec_idle_wait_time);
        }
#endif
        cacheinfo_cpu_offline(cpu);
        of_node_put(s->of_node);
        s->of_node = NULL;
        return 0;
}
#else /* !CONFIG_HOTPLUG_CPU */
#define unregister_cpu_online NULL
#endif

#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 */

static DEFINE_MUTEX(cpu_mutex);

int cpu_add_dev_attr(struct device_attribute *attr)
{
        int cpu;

        mutex_lock(&cpu_mutex);

        for_each_possible_cpu(cpu) {
                device_create_file(get_cpu_device(cpu), attr);
        }

        mutex_unlock(&cpu_mutex);
        return 0;
}
EXPORT_SYMBOL_GPL(cpu_add_dev_attr);

int cpu_add_dev_attr_group(struct attribute_group *attrs)
{
        int cpu;
        struct device *dev;
        int ret;

        mutex_lock(&cpu_mutex);

        for_each_possible_cpu(cpu) {
                dev = get_cpu_device(cpu);
                ret = sysfs_create_group(&dev->kobj, attrs);
                WARN_ON(ret != 0);
        }

        mutex_unlock(&cpu_mutex);
        return 0;
}
EXPORT_SYMBOL_GPL(cpu_add_dev_attr_group);


void cpu_remove_dev_attr(struct device_attribute *attr)
{
        int cpu;

        mutex_lock(&cpu_mutex);

        for_each_possible_cpu(cpu) {
                device_remove_file(get_cpu_device(cpu), attr);
        }

        mutex_unlock(&cpu_mutex);
}
EXPORT_SYMBOL_GPL(cpu_remove_dev_attr);

void cpu_remove_dev_attr_group(struct attribute_group *attrs)
{
        int cpu;
        struct device *dev;

        mutex_lock(&cpu_mutex);

        for_each_possible_cpu(cpu) {
                dev = get_cpu_device(cpu);
                sysfs_remove_group(&dev->kobj, attrs);
        }

        mutex_unlock(&cpu_mutex);
}
EXPORT_SYMBOL_GPL(cpu_remove_dev_attr_group);


/* NUMA stuff */

#ifdef CONFIG_NUMA
int sysfs_add_device_to_node(struct device *dev, int nid)
{
        struct node *node = node_devices[nid];
        return sysfs_create_link(&node->dev.kobj, &dev->kobj,
                        kobject_name(&dev->kobj));
}
EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);

void sysfs_remove_device_from_node(struct device *dev, int nid)
{
        struct node *node = node_devices[nid];
        sysfs_remove_link(&node->dev.kobj, kobject_name(&dev->kobj));
}
EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
#endif

/* Only valid if CPU is present. */
static ssize_t show_physical_id(struct device *dev,
                                struct device_attribute *attr, char *buf)
{
        struct cpu *cpu = container_of(dev, struct cpu, dev);

        return sprintf(buf, "%d\n", get_hard_smp_processor_id(cpu->dev.id));
}
static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL);

static int __init topology_init(void)
{
        int cpu, r;

        for_each_possible_cpu(cpu) {
                struct cpu *c = &per_cpu(cpu_devices, cpu);

#ifdef CONFIG_HOTPLUG_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 (smp_ops && smp_ops->cpu_offline_self)
                        c->hotpluggable = 1;
#endif

                if (cpu_online(cpu) || c->hotpluggable) {
                        register_cpu(c, cpu);

                        device_create_file(&c->dev, &dev_attr_physical_id);
                }
        }
        r = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/topology:online",
                              register_cpu_online, unregister_cpu_online);
        WARN_ON(r < 0);
#ifdef CONFIG_PPC64
        sysfs_create_dscr_default();
#endif /* CONFIG_PPC64 */

        create_svm_file();

        return 0;
}
subsys_initcall(topology_init);
Linux
