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yaml
---
r: 55168
b: refs/heads/master
c: 4e9baad
h: refs/heads/master
v: v3
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Rudolf Marek authored and Jean Delvare committed May 8, 2007
1 parent fdc8757 commit 1eefca8
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Showing 4 changed files with 90 additions and 8 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 9ca8e40c8414d25e880b587cbd4d130750c49588
refs/heads/master: 4e9baad8f5cb2040e802eff484fad7e721b21c0b
73 changes: 67 additions & 6 deletions trunk/arch/i386/lib/msr-on-cpu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
struct msr_info {
u32 msr_no;
u32 l, h;
int err;
};

static void __rdmsr_on_cpu(void *info)
Expand All @@ -15,20 +16,38 @@ static void __rdmsr_on_cpu(void *info)
rdmsr(rv->msr_no, rv->l, rv->h);
}

void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *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;
preempt_disable();
if (smp_processor_id() == cpu)
rdmsr(msr_no, *l, *h);
if (safe)
err = rdmsr_safe(msr_no, l, h);
else
rdmsr(msr_no, *l, *h);
else {
struct msr_info rv;

rv.msr_no = msr_no;
smp_call_function_single(cpu, __rdmsr_on_cpu, &rv, 0, 1);
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;
}
preempt_enable();
return err;
}

static void __wrmsr_on_cpu(void *info)
Expand All @@ -38,21 +57,63 @@ static void __wrmsr_on_cpu(void *info)
wrmsr(rv->msr_no, rv->l, rv->h);
}

void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 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;
preempt_disable();
if (smp_processor_id() == cpu)
wrmsr(msr_no, l, h);
if (safe)
err = wrmsr_safe(msr_no, l, h);
else
wrmsr(msr_no, l, h);
else {
struct msr_info rv;

rv.msr_no = msr_no;
rv.l = l;
rv.h = h;
smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 0, 1);
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);
}
}
preempt_enable();
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);
12 changes: 11 additions & 1 deletion trunk/include/asm-i386/msr.h
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,7 @@ static inline unsigned long long native_read_pmc(void)
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else

#include <linux/errno.h>
/*
* Access to machine-specific registers (available on 586 and better only)
* Note: the rd* operations modify the parameters directly (without using
Expand Down Expand Up @@ -148,6 +148,8 @@ static inline void wrmsrl (unsigned long msr, unsigned long long val)
#ifdef CONFIG_SMP
void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
#else /* CONFIG_SMP */
static inline void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
Expand All @@ -157,6 +159,14 @@ static inline void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
wrmsr(msr_no, l, h);
}
static inline int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
return rdmsr_safe(msr_no, l, h);
}
static inline int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
return wrmsr_safe(msr_no, l, h);
}
#endif /* CONFIG_SMP */
#endif
#endif
Expand Down
11 changes: 11 additions & 0 deletions trunk/include/asm-x86_64/msr.h
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
#include <asm/msr-index.h>

#ifndef __ASSEMBLY__
#include <linux/errno.h>
/*
* Access to machine-specific registers (available on 586 and better only)
* Note: the rd* operations modify the parameters directly (without using
Expand Down Expand Up @@ -162,6 +163,8 @@ static inline unsigned int cpuid_edx(unsigned int op)
#ifdef CONFIG_SMP
void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
#else /* CONFIG_SMP */
static inline void rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
Expand All @@ -171,6 +174,14 @@ static inline void wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
wrmsr(msr_no, l, h);
}
static inline int rdmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h)
{
return rdmsr_safe(msr_no, l, h);
}
static inline int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h)
{
return wrmsr_safe(msr_no, l, h);
}
#endif /* CONFIG_SMP */
#endif /* __ASSEMBLY__ */
#endif /* X86_64_MSR_H */

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