[IA64] Support irq migration across domain

Add support for IRQ migration across vector domain.

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>

1 files changed, 14 insertions, 6 deletions

diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index 1d22670cc88b..2fdbd5c3f213 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -13,6 +13,7 @@
 
 #define MSI_DATA_VECTOR_SHIFT           0
 #define     MSI_DATA_VECTOR(v)          (((u8)v) << MSI_DATA_VECTOR_SHIFT)
+#define MSI_DATA_VECTOR_MASK            0xffffff00
 
 #define MSI_DATA_DELIVERY_SHIFT         8
 #define     MSI_DATA_DELIVERY_FIXED     (0 << MSI_DATA_DELIVERY_SHIFT)
@@ -50,22 +51,29 @@ static struct irq_chip	ia64_msi_chip;
 static void ia64_set_msi_irq_affinity(unsigned int irq, cpumask_t cpu_mask)
 {
         struct msi_msg msg;
-        u32 addr;
+        u32 addr, data;
+        int cpu = first_cpu(cpu_mask);
 
-        /* IRQ migration across domain is not supported yet */
-        cpus_and(cpu_mask, cpu_mask, irq_to_domain(irq));
-        if (cpus_empty(cpu_mask))
+        if (!cpu_online(cpu))
+                return;
+
+        if (reassign_irq_vector(irq, cpu))
                 return;
 
         read_msi_msg(irq, &msg);
 
         addr = msg.address_lo;
         addr &= MSI_ADDR_DESTID_MASK;
-        addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(first_cpu(cpu_mask)));
+        addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(cpu));
         msg.address_lo = addr;
 
+        data = msg.data;
+        data &= MSI_DATA_VECTOR_MASK;
+        data |= MSI_DATA_VECTOR(irq_to_vector(irq));
+        msg.data = data;
+
         write_msi_msg(irq, &msg);
-        irq_desc[irq].affinity = cpu_mask;
+        irq_desc[irq].affinity = cpumask_of_cpu(cpu);
 }
 #endif /* CONFIG_SMP */