x86: Add cpu_mask_to_apicid_and
Impact: new API
Add a helper function that takes two cpumask's, and's them and then
returns the apicid of the result. This removes a need in io_apic.c
that uses a temporary cpumask to hold (mask & cfg->domain).
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/arch/x86/include/asm/bigsmp/apic.h b/arch/x86/include/asm/bigsmp/apic.h
index dc6225c..99f9aba 100644
--- a/arch/x86/include/asm/bigsmp/apic.h
+++ b/arch/x86/include/asm/bigsmp/apic.h
@@ -129,6 +129,22 @@
return apicid;
}
+static inline unsigned int cpu_mask_to_apicid_and(const cpumask_t *cpumask,
+ const cpumask_t *andmask)
+{
+ int cpu;
+
+ /*
+ * We're using fixed IRQ delivery, can only return one phys APIC ID.
+ * May as well be the first.
+ */
+ while ((cpu = next_cpu(-1, *cpumask)) < nr_cpu_ids)
+ if (cpu_isset(cpu, *andmask))
+ return cpu_to_logical_apicid(cpu);
+
+ return BAD_APICID;
+}
+
static inline u32 phys_pkg_id(u32 cpuid_apic, int index_msb)
{
return cpuid_apic >> index_msb;