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Subject[patch 6/8] 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>
---
arch/x86/kernel/apic/io_apic.c | 54 +++++++++--------------------------------
1 file changed, 12 insertions(+), 42 deletions(-)

Index: tree/arch/x86/kernel/apic/io_apic.c
===================================================================
--- tree.orig/arch/x86/kernel/apic/io_apic.c
+++ tree/arch/x86/kernel/apic/io_apic.c
@@ -2267,6 +2267,9 @@ ioapic_set_affinity(struct irq_data *dat
* 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 *
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,

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,



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