[IA64] Enable percpu vector domain for IA64_GENERIC

Add per-CPU vector domain support for IA64_GENERIC. It is enabled by
adding the "vector=percpu" boot option.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

2 files changed, 29 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8363ad3ba018..c48bc2e159ce 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1859,6 +1859,9 @@ and is between 256 and 4096 characters. It is defined in the file
                         vdso=1: enable VDSO (default)
                         vdso=0: disable VDSO mapping
 
+        vector=         [IA-64,SMP]
+                        vector=percpu: enable percpu vector domain
+
         video=          [FB] Frame buffer configuration
                         See Documentation/fb/modedb.txt.
 
diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
index 22806b94025a..5cb804f9a1ff 100644
--- a/arch/ia64/kernel/irq_ia64.c
+++ b/arch/ia64/kernel/irq_ia64.c
@@ -267,10 +267,36 @@ void __setup_vector_irq(int cpu)
         }
 }
 
+#if defined(CONFIG_IA64_GENERIC)
+static enum vector_domain_type {
+        VECTOR_DOMAIN_NONE,
+        VECTOR_DOMAIN_PERCPU
+} vector_domain_type = VECTOR_DOMAIN_NONE;
+
+static cpumask_t vector_allocation_domain(int cpu)
+{
+        if (vector_domain_type == VECTOR_DOMAIN_PERCPU)
+                return cpumask_of_cpu(cpu);
+        return CPU_MASK_ALL;
+}
+
+static int __init parse_vector_domain(char *arg)
+{
+        if (!arg)
+                return -EINVAL;
+        if (!strcmp(arg, "percpu")) {
+                vector_domain_type = VECTOR_DOMAIN_PERCPU;
+                no_int_routing = 1;
+        }
+        return 1;
+}
+early_param("vector", parse_vector_domain);
+#else
 static cpumask_t vector_allocation_domain(int cpu)
 {
         return CPU_MASK_ALL;
 }
+#endif
 
 
 void destroy_and_reserve_irq(unsigned int irq)