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>

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.