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>

1 files changed, 47 insertions, 0 deletions

diff --git a/arch/x86/include/asm/es7000/apic.h b/arch/x86/include/asm/es7000/apic.h
index 4cac0837bb40..c2bed772af88 100644
--- a/arch/x86/include/asm/es7000/apic.h
+++ b/arch/x86/include/asm/es7000/apic.h
@@ -214,6 +214,53 @@ static inline unsigned int cpu_mask_to_apicid(const cpumask_t *cpumask)
 	return apicid;
 }
 
+static inline unsigned int cpu_mask_to_apicid_and(const cpumask_t *cpumask,
+						  const cpumask_t *andmask)
+{
+	int num_bits_set;
+	int num_bits_set2;
+	int cpus_found = 0;
+	int cpu;
+	int apicid = 0;
+
+	num_bits_set = cpus_weight(*cpumask);
+	num_bits_set2 = cpus_weight(*andmask);
+	num_bits_set = min_t(int, num_bits_set, num_bits_set2);
+	/* Return id to all */
+	if (num_bits_set >= nr_cpu_ids)
+#if defined CONFIG_ES7000_CLUSTERED_APIC
+		return 0xFF;
+#else
+		return cpu_to_logical_apicid(0);
+#endif
+	/*
+	 * The cpus in the mask must all be on the apic cluster.  If are not
+	 * on the same apicid cluster return default value of TARGET_CPUS.
+	 */
+	while ((cpu = next_cpu(-1, *cpumask)) < nr_cpu_ids)
+		if (cpu_isset(cpu, *andmask)
+			apicid = cpu_to_logical_apicid(cpu);
+	while (cpus_found < num_bits_set) {
+		if (cpu_isset(cpu, *cpumask) && cpu_isset(cpu, *andmask)) {
+			int new_apicid = cpu_to_logical_apicid(cpu);
+			if (apicid_cluster(apicid) !=
+					apicid_cluster(new_apicid)) {
+				printk(KERN_WARNING
+					"%s: Not a valid mask!\n", __func__);
+#if defined CONFIG_ES7000_CLUSTERED_APIC
+				return 0xFF;
+#else
+				return cpu_to_logical_apicid(0);
+#endif
+			}
+			apicid = new_apicid;
+			cpus_found++;
+		}
+		cpu++;
+	}
+	return apicid;
+}
+
 static inline u32 phys_pkg_id(u32 cpuid_apic, int index_msb)
 {
 	return cpuid_apic >> index_msb;