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root/arch/x86/lib/msr-on-cpu.c

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DEFINITIONS

This source file includes following definitions.
  1. __rdmsr_on_cpu
  2. __wrmsr_on_cpu
  3. rdmsr_on_cpu
  4. wrmsr_on_cpu
  5. __rdmsr_safe_on_cpu
  6. __wrmsr_safe_on_cpu
  7. rdmsr_safe_on_cpu
  8. wrmsr_safe_on_cpu

#include <linux/module.h>
#include <linux/preempt.h>
#include <linux/smp.h>
#include <asm/msr.h>

struct msr_info {
        u32 msr_no;
        u32 l, h;
        int err;
};

static void __rdmsr_on_cpu(void *info)
{
        struct msr_info *rv = info;

        rdmsr(rv->msr_no, rv->l, rv->h);
}

static void __wrmsr_on_cpu(void *info)
{
        struct msr_info *rv = info;

        wrmsr(rv->msr_no, rv->l, rv->h);
}

int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
        int err;
        struct msr_info rv;

        rv.msr_no = msr_no;
        err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
        *l = rv.l;
        *h = rv.h;

        return err;
}

int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
        int err;
        struct msr_info rv;

        rv.msr_no = msr_no;
        rv.l = l;
        rv.h = h;
        err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);

        return err;
}

/* These "safe" variants are slower and should be used when the target MSR
   may not actually exist. */
static void __rdmsr_safe_on_cpu(void *info)
{
        struct msr_info *rv = info;

        rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
}

static void __wrmsr_safe_on_cpu(void *info)
{
        struct msr_info *rv = info;

        rv->err = wrmsr_safe(rv->msr_no, rv->l, rv->h);
}

int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
        int err;
        struct msr_info rv;

        rv.msr_no = msr_no;
        err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
        *l = rv.l;
        *h = rv.h;

        return err ? err : rv.err;
}

int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
        int err;
        struct msr_info rv;

        rv.msr_no = msr_no;
        rv.l = l;
        rv.h = h;
        err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);

        return err ? err : rv.err;
}

EXPORT_SYMBOL(rdmsr_on_cpu);
EXPORT_SYMBOL(wrmsr_on_cpu);
EXPORT_SYMBOL(rdmsr_safe_on_cpu);
EXPORT_SYMBOL(wrmsr_safe_on_cpu);

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