227 lines
4.2 KiB
C
227 lines
4.2 KiB
C
#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;
|
|
|
|
this_cpu = get_cpu();
|
|
|
|
if (cpumask_test_cpu(this_cpu, mask))
|
|
__rdmsr_on_cpu(&rv);
|
|
|
|
smp_call_function_many(mask, __rdmsr_on_cpu, &rv, 1);
|
|
put_cpu();
|
|
}
|
|
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;
|
|
|
|
this_cpu = get_cpu();
|
|
|
|
if (cpumask_test_cpu(this_cpu, mask))
|
|
__wrmsr_on_cpu(&rv);
|
|
|
|
smp_call_function_many(mask, __wrmsr_on_cpu, &rv, 1);
|
|
put_cpu();
|
|
}
|
|
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);
|
|
|
|
/*
|
|
* These variants are significantly slower, but allows control over
|
|
* the entire 32-bit GPR set.
|
|
*/
|
|
struct msr_regs_info {
|
|
u32 *regs;
|
|
int err;
|
|
};
|
|
|
|
static void __rdmsr_safe_regs_on_cpu(void *info)
|
|
{
|
|
struct msr_regs_info *rv = info;
|
|
|
|
rv->err = rdmsr_safe_regs(rv->regs);
|
|
}
|
|
|
|
static void __wrmsr_safe_regs_on_cpu(void *info)
|
|
{
|
|
struct msr_regs_info *rv = info;
|
|
|
|
rv->err = wrmsr_safe_regs(rv->regs);
|
|
}
|
|
|
|
int rdmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
|
|
{
|
|
int err;
|
|
struct msr_regs_info rv;
|
|
|
|
rv.regs = regs;
|
|
rv.err = -EIO;
|
|
err = smp_call_function_single(cpu, __rdmsr_safe_regs_on_cpu, &rv, 1);
|
|
|
|
return err ? err : rv.err;
|
|
}
|
|
EXPORT_SYMBOL(rdmsr_safe_regs_on_cpu);
|
|
|
|
int wrmsr_safe_regs_on_cpu(unsigned int cpu, u32 *regs)
|
|
{
|
|
int err;
|
|
struct msr_regs_info rv;
|
|
|
|
rv.regs = regs;
|
|
rv.err = -EIO;
|
|
err = smp_call_function_single(cpu, __wrmsr_safe_regs_on_cpu, &rv, 1);
|
|
|
|
return err ? err : rv.err;
|
|
}
|
|
EXPORT_SYMBOL(wrmsr_safe_regs_on_cpu);
|