x86, msi, intr-remap: Use the ioapic set affinity routine

IRQ set affinity routine is same for the IO-APIC IRQ's aswell as
the MSI IRQ's in the presence of interrupt-remapping. This is
because we modify the interrupt-remapping table entry and
doesn't touch the IO-APIC RTE or the MSI entry.

So remove the ir_msi_set_affinity() and re-use the
ir_ioapic_set_affinity()

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: yinghai@kernel.org
Cc: youquan.song@intel.com
Cc: joerg.roedel@amd.com
Cc: tony.luck@intel.com
Cc: dwmw2@infradead.org
Link: http://lkml.kernel.org/r/20110824001456.452760446@sbsiddha-desk.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 8eb863e..f88af6b 100644 (file)
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2267,6 +2267,9 @@ ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
  * updated vector information), by using a virtual vector (io-apic pin number).
  * Real vector that is used for interrupting cpu will be coming from
  * the interrupt-remapping table entry.
+ *
+ * As the migration is a simple atomic update of IRTE, the same mechanism
+ * is used to migrate MSI irq's in the presence of interrupt-remapping.
  */
 static int
 ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
@@ -2291,10 +2294,16 @@ ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
        irte.dest_id = IRTE_DEST(dest);
 
        /*
-        * Modified the IRTE and flushes the Interrupt entry cache.
+        * Atomically updates the IRTE with the new destination, vector
+        * and flushes the interrupt entry cache.
         */
        modify_irte(irq, &irte);
 
+       /*
+        * After this point, all the interrupts will start arriving
+        * at the new destination. So, time to cleanup the previous
+        * vector allocation.
+        */
        if (cfg->move_in_progress)
                send_cleanup_vector(cfg);
 
@@ -3144,45 +3153,6 @@ msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
 
        return 0;
 }
-#ifdef CONFIG_INTR_REMAP
-/*
- * Migrate the MSI irq to another cpumask. This migration is
- * done in the process context using interrupt-remapping hardware.
- */
-static int
-ir_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
-                   bool force)
-{
-       struct irq_cfg *cfg = data->chip_data;
-       unsigned int dest, irq = data->irq;
-       struct irte irte;
-
-       if (get_irte(irq, &irte))
-               return -1;
-
-       if (__ioapic_set_affinity(data, mask, &dest))
-               return -1;
-
-       irte.vector = cfg->vector;
-       irte.dest_id = IRTE_DEST(dest);
-
-       /*
-        * atomically update the IRTE with the new destination and vector.
-        */
-       modify_irte(irq, &irte);
-
-       /*
-        * After this point, all the interrupts will start arriving
-        * at the new destination. So, time to cleanup the previous
-        * vector allocation.
-        */
-       if (cfg->move_in_progress)
-               send_cleanup_vector(cfg);
-
-       return 0;
-}
-
-#endif
 #endif /* CONFIG_SMP */
 
 /*
@@ -3207,7 +3177,7 @@ static struct irq_chip msi_ir_chip = {
 #ifdef CONFIG_INTR_REMAP
        .irq_ack                = ir_ack_apic_edge,
 #ifdef CONFIG_SMP
-       .irq_set_affinity       = ir_msi_set_affinity,
+       .irq_set_affinity       = ir_ioapic_set_affinity,
 #endif
 #endif
        .irq_retrigger          = ioapic_retrigger_irq,
@@ -3416,7 +3386,7 @@ static struct irq_chip ir_hpet_msi_type = {
 #ifdef CONFIG_INTR_REMAP
        .irq_ack                = ir_ack_apic_edge,
 #ifdef CONFIG_SMP
-       .irq_set_affinity       = ir_msi_set_affinity,
+       .irq_set_affinity       = ir_ioapic_set_affinity,
 #endif
 #endif
        .irq_retrigger          = ioapic_retrigger_irq,