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| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2013-10-11 16:54:58 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-10-17 00:36:06 +0200 |
| commit | 1a6b991a9875a4c4811c7baf4058fa17aa1a9d9b (patch) | |
| tree | 1c6238148f92459f10a855d6ee7ab40126dfa103 /arch/x86/lib | |
| parent | 12cc4b3827f8cc5973f86330ccc9d9656a31bfa8 (diff) | |
| download | linux-1a6b991a9875a4c4811c7baf4058fa17aa1a9d9b.tar.gz linux-1a6b991a9875a4c4811c7baf4058fa17aa1a9d9b.tar.bz2 linux-1a6b991a9875a4c4811c7baf4058fa17aa1a9d9b.zip | |
x86 / msr: add 64bit _on_cpu access functions
Having 64-bit MSR access methods on given CPU can avoid shifting and
simplify MSR content manipulation. We already have other combinations
of rdmsrl_xxx and wrmsrl_xxx but missing the _on_cpu version.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/msr-smp.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/arch/x86/lib/msr-smp.c b/arch/x86/lib/msr-smp.c index a6b1b86d2253..518532e6a3fa 100644 --- a/arch/x86/lib/msr-smp.c +++ b/arch/x86/lib/msr-smp.c @@ -47,6 +47,21 @@ int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h) } EXPORT_SYMBOL(rdmsr_on_cpu); +int rdmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 *q) +{ + 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); + *q = rv.reg.q; + + return err; +} +EXPORT_SYMBOL(rdmsrl_on_cpu); + int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) { int err; @@ -63,6 +78,22 @@ int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) } EXPORT_SYMBOL(wrmsr_on_cpu); +int wrmsrl_on_cpu(unsigned int cpu, u32 msr_no, u64 q) +{ + int err; + struct msr_info rv; + + memset(&rv, 0, sizeof(rv)); + + rv.msr_no = msr_no; + rv.reg.q = q; + + err = smp_call_function_single(cpu, __wrmsr_on_cpu, &rv, 1); + + return err; +} +EXPORT_SYMBOL(wrmsrl_on_cpu); + static void __rwmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs, void (*msr_func) (void *info)) @@ -159,6 +190,37 @@ int wrmsr_safe_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h) } EXPORT_SYMBOL(wrmsr_safe_on_cpu); +int wrmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 q) +{ + int err; + struct msr_info rv; + + memset(&rv, 0, sizeof(rv)); + + rv.msr_no = msr_no; + rv.reg.q = q; + + err = smp_call_function_single(cpu, __wrmsr_safe_on_cpu, &rv, 1); + + return err ? err : rv.err; +} +EXPORT_SYMBOL(wrmsrl_safe_on_cpu); + +int rdmsrl_safe_on_cpu(unsigned int cpu, u32 msr_no, u64 *q) +{ + 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); + *q = rv.reg.q; + + return err ? err : rv.err; +} +EXPORT_SYMBOL(rdmsrl_safe_on_cpu); + /* * These variants are significantly slower, but allows control over * the entire 32-bit GPR set. |