u32 msr_no;
struct msr reg;
struct msr *msrs;
- int off;
int err;
};
int this_cpu = raw_smp_processor_id();
if (rv->msrs)
- reg = &rv->msrs[this_cpu - rv->off];
+ reg = per_cpu_ptr(rv->msrs, this_cpu);
else
reg = &rv->reg;
int this_cpu = raw_smp_processor_id();
if (rv->msrs)
- reg = &rv->msrs[this_cpu - rv->off];
+ reg = per_cpu_ptr(rv->msrs, this_cpu);
else
reg = &rv->reg;
}
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)
+static void __rwmsr_on_cpus(const struct cpumask *mask, u32 msr_no,
+ struct msr *msrs,
+ void (*msr_func) (void *info))
{
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);
+ msr_func(&rv);
- smp_call_function_many(mask, __rdmsr_on_cpu, &rv, 1);
+ smp_call_function_many(mask, msr_func, &rv, 1);
put_cpu();
}
+
+/* rdmsr on a bunch of CPUs
+ *
+ * @mask: which CPUs
+ * @msr_no: which MSR
+ * @msrs: array of MSR values
+ *
+ */
+void rdmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
+{
+ __rwmsr_on_cpus(mask, msr_no, msrs, __rdmsr_on_cpu);
+}
EXPORT_SYMBOL(rdmsr_on_cpus);
/*
* @msrs: array of MSR values
*
*/
-void wrmsr_on_cpus(const cpumask_t *mask, u32 msr_no, struct msr *msrs)
+void wrmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
{
- struct msr_info rv;
- int this_cpu;
-
- memset(&rv, 0, sizeof(rv));
+ __rwmsr_on_cpus(mask, msr_no, msrs, __wrmsr_on_cpu);
+}
+EXPORT_SYMBOL(wrmsr_on_cpus);
- rv.off = cpumask_first(mask);
- rv.msrs = msrs;
- rv.msr_no = msr_no;
+struct msr *msrs_alloc(void)
+{
+ struct msr *msrs = NULL;
- this_cpu = get_cpu();
+ msrs = alloc_percpu(struct msr);
+ if (!msrs) {
+ pr_warning("%s: error allocating msrs\n", __func__);
+ return NULL;
+ }
- if (cpumask_test_cpu(this_cpu, mask))
- __wrmsr_on_cpu(&rv);
+ return msrs;
+}
+EXPORT_SYMBOL(msrs_alloc);
- smp_call_function_many(mask, __wrmsr_on_cpu, &rv, 1);
- put_cpu();
+void msrs_free(struct msr *msrs)
+{
+ free_percpu(msrs);
}
-EXPORT_SYMBOL(wrmsr_on_cpus);
+EXPORT_SYMBOL(msrs_free);
/* These "safe" variants are slower and should be used when the target MSR
may not actually exist. */