powerpc: use end_IRQ for iseries irqs

Encode the sub bus number into the real irq number (even though it
is always zero for now) so that we have enough information to do
the EOI in iseries_end_IRQ.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

arch/powerpc/platforms/iseries/irq.c

@@ -101,9 +101,6 @@ static void int_received(struct pci_event *event, struct pt_regs *regs)
 		} else
 #endif
 			__do_IRQ(irq, regs);
-		HvCallPci_eoi(event->data.slot.bus_number,
-			event->data.slot.sub_bus_number,
-			event->data.slot.dev_id);
 		break;
 		/* Ignore error recovery events for now */
 	case pe_bus_created:
@@ -189,6 +186,7 @@ void __init iSeries_init_IRQ(void)
 				"failed with rc 0x%x\n", ret);
 }
 
+#define REAL_IRQ_TO_SUBBUS(irq)	(((irq) >> 14) & 0xff)
 #define REAL_IRQ_TO_BUS(irq)	((((irq) >> 6) & 0xff) + 1)
 #define REAL_IRQ_TO_IDSEL(irq)	((((irq) >> 3) & 7) + 1)
 #define REAL_IRQ_TO_FUNC(irq)	((irq) & 7)
@@ -294,12 +292,12 @@ static void iseries_disable_IRQ(unsigned int irq)
 	HvCallPci_maskInterrupts(bus, sub_bus, dev_id, mask);
 }
 
-/*
- * This does nothing because there is not enough information
- * provided to do the EOI HvCall.  This is done by XmPciLpEvent.c
- */
 static void iseries_end_IRQ(unsigned int irq)
 {
+	unsigned int rirq = virt_irq_to_real_map[irq];
+
+	HvCallPci_eoi(REAL_IRQ_TO_BUS(rirq), REAL_IRQ_TO_SUBBUS(rirq),
+		(REAL_IRQ_TO_IDSEL(rirq) << 4) + REAL_IRQ_TO_FUNC(rirq));
 }
 
 static hw_irq_controller iSeries_IRQ_handler = {
@@ -314,17 +312,18 @@ static hw_irq_controller iSeries_IRQ_handler = {
 /*
  * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot
  * It calculates the irq value for the slot.
- * Note that sub_bus_number is always 0 (at the moment at least).
+ * Note that sub_bus is always 0 (at the moment at least).
  */
-int __init iSeries_allocate_IRQ(HvBusNumber bus_number,
-		HvSubBusNumber sub_bus_number, HvAgentId dev_id)
+int __init iSeries_allocate_IRQ(HvBusNumber bus,
+		HvSubBusNumber sub_bus, HvAgentId dev_id)
 {
 	int virtirq;
 	unsigned int realirq;
 	u8 idsel = (dev_id >> 4);
 	u8 function = dev_id & 7;
 
-	realirq = ((bus_number - 1) << 6) + ((idsel - 1) << 3) + function;
+	realirq = (((((sub_bus << 8) + (bus - 1)) << 3) + (idsel - 1)) << 3)
+		+ function;
 	virtirq = virt_irq_create_mapping(realirq);
 
 	irq_desc[virtirq].handler = &iSeries_IRQ_handler;