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#include <linux/module.h>
#include <linux/preempt.h>
#include <linux/smp.h>
#include <asm/msr.h>
struct msr_info {
u32 msr_no;
struct msr reg;
struct msr *msrs;
int off;
int err;
};
static void __rdmsr_on_cpu(void *info)
{
struct msr_info *rv = info;
struct msr *reg;
int this_cpu = raw_smp_processor_id();
if (rv->msrs)
reg = &rv->msrs[this_cpu - rv->off];
else
reg = &rv->reg;
rdmsr(rv->msr_no, reg->l, reg->h);
}
static void __wrmsr_on_cpu(void *info)
{
struct msr_info *rv = info;
struct msr *reg;
int this_cpu = raw_smp_processor_id();
if (rv->msrs)
reg = &rv->msrs[this_cpu - rv->off];
else
reg = &rv->reg;
wrmsr(rv->msr_no, reg->l, reg->h);
}
int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
int err;
struct msr_info rv;
memset(&rv, 0, sizeof(rv));
rv.msr_no = msr_no;
err = smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 1);
*l = rv.reg.l;
*h = rv.reg.h;
return err;
}
EXPORT_SYMBOL(rdmsr_on_cpu);
int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
int err;
struct msr_info rv;
memset(&rv, 0, sizeof(rv));
rv.msr_no = msr_no;
rv.reg.l = l;
rv.reg.h = h;
err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1);
return err;
}
EXPORT_SYMBOL(wrmsr_on_cpu);
/* rdmsr on a bunch of CPUs
*
* @mask: which CPUs
* @msr_no: which MSR
* @msrs: array of MSR values
*
*/
void rdmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs)
{
struct msr_info rv;
int this_cpu;
memset(&rv, 0, sizeof(rv));
rv.off = cpumask_first(mask);
rv.msrs = msrs;
rv.msr_no = msr_no;
preempt_disable();
/*
* FIXME: handle the CPU we're executing on separately for now until
* smp_call_function_many has been fixed to not skip it.
*/
this_cpu = raw_smp_processor_id();
smp_call_function_single(this_cpu, __rdmsr_on_cpu, &rv, 1);
smp_call_function_many(mask, __rdmsr_on_cpu, &rv, 1);
preempt_enable();
}
EXPORT_SYMBOL(rdmsr_on_cpus);
/*
* wrmsr on a bunch of CPUs
*
* @mask: which CPUs
* @msr_no: which MSR
* @msrs: array of MSR values
*
*/
void wrmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs)
{
struct msr_info rv;
int this_cpu;
memset(&rv, 0, sizeof(rv));
rv.off = cpumask_first(mask);
rv.msrs = msrs;
rv.msr_no = msr_no;
preempt_disable();
/*
* FIXME: handle the CPU we're executing on separately for now until
* smp_call_function_many has been fixed to not skip it.
*/
this_cpu = raw_smp_processor_id();
smp_call_function_single(this_cpu, __wrmsr_on_cpu, &rv, 1);
smp_call_function_many(mask, __wrmsr_on_cpu, &rv, 1);
preempt_enable();
}
EXPORT_SYMBOL(wrmsr_on_cpus);
/* 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->reg.l, &rv->reg.h);
}
static void __wrmsr_safe_on_cpu(void *info)
{
struct msr_info *rv = info;
rv->err = wrmsr_safe(rv->msr_no, rv->reg.l, rv->reg.h);
}
int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
int err;
struct msr_info rv;
memset(&rv, 0, sizeof(rv));
rv.msr_no = msr_no;
err = smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 1);
*l = rv.reg.l;
*h = rv.reg.h;
return err ? err : rv.err;
}
EXPORT_SYMBOL(rdmsr_safe_on_cpu);
int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
int err;
struct msr_info rv;
memset(&rv, 0, sizeof(rv));
rv.msr_no = msr_no;
rv.reg.l = l;
rv.reg.h = h;
err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1);
return err ? err : rv.err;
}
EXPORT_SYMBOL(wrmsr_safe_on_cpu);
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