mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 16:30:53 +07:00
5f1f935ca4
smp_call_function_single() now knows how to call the function on the current cpu. [ tglx: arch/x86 adaptation ] Cc: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
102 lines
2.0 KiB
C
102 lines
2.0 KiB
C
#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 __rdmsr_safe_on_cpu(void *info)
|
|
{
|
|
struct msr_info *rv = info;
|
|
|
|
rv->err = rdmsr_safe(rv->msr_no, &rv->l, &rv->h);
|
|
}
|
|
|
|
static int _rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h, int safe)
|
|
{
|
|
int err = 0;
|
|
struct msr_info rv;
|
|
|
|
rv.msr_no = msr_no;
|
|
if (safe) {
|
|
smp_call_function_single(cpu, __rdmsr_safe_on_cpu, &rv, 0, 1);
|
|
err = rv.err;
|
|
} else {
|
|
smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
|
|
}
|
|
*l = rv.l;
|
|
*h = rv.h;
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __wrmsr_on_cpu(void *info)
|
|
{
|
|
struct msr_info *rv = info;
|
|
|
|
wrmsr(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);
|
|
}
|
|
|
|
static int _wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h, int safe)
|
|
{
|
|
int err = 0;
|
|
struct msr_info rv;
|
|
|
|
rv.msr_no = msr_no;
|
|
rv.l = l;
|
|
rv.h = h;
|
|
if (safe) {
|
|
smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 0, 1);
|
|
err = rv.err;
|
|
} else {
|
|
smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
|
|
{
|
|
_wrmsr_on_cpu(cpu, msr_no, l, h, 0);
|
|
}
|
|
|
|
void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
|
|
{
|
|
_rdmsr_on_cpu(cpu, msr_no, l, h, 0);
|
|
}
|
|
|
|
/* These "safe" variants are slower and should be used when the target MSR
|
|
may not actually exist. */
|
|
int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
|
|
{
|
|
return _wrmsr_on_cpu(cpu, msr_no, l, h, 1);
|
|
}
|
|
|
|
int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
|
|
{
|
|
return _rdmsr_on_cpu(cpu, msr_no, l, h, 1);
|
|
}
|
|
|
|
EXPORT_SYMBOL(rdmsr_on_cpu);
|
|
EXPORT_SYMBOL(wrmsr_on_cpu);
|
|
EXPORT_SYMBOL(rdmsr_safe_on_cpu);
|
|
EXPORT_SYMBOL(wrmsr_safe_on_cpu);
|