[IA64] genirq fixup for SGI/SN

This patch allows the system to boot and enables the console and at least
some hardware drivers, as well as some platform error handling.

Tested on a variety of SGI Altix system without issues.
Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Tested-by: Raymund Will <rw@suse.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/sn/kernel/huberror.c

@@ -192,6 +192,7 @@ void hub_error_init(struct hubdev_info *hubdev_info)
 		    hubdev_info);
 		return;
 	}
+	irq_set_handler(SGI_II_ERROR, handle_level_irq);
 	sn_set_err_irq_affinity(SGI_II_ERROR);
 }
 
@@ -213,6 +214,7 @@ void ice_error_init(struct hubdev_info *hubdev_info)
                        hubdev_info);
 		return;
 	}
+	irq_set_handler(SGI_TIO_ERROR, handle_level_irq);
 	sn_set_err_irq_affinity(SGI_TIO_ERROR);
 }
 

arch/ia64/sn/kernel/irq.c

@@ -352,6 +352,8 @@ void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
 	spin_lock(&sn_irq_info_lock);
 	list_add_rcu(&sn_irq_info->list, sn_irq_lh[sn_irq_info->irq_irq]);
 	reserve_irq_vector(sn_irq_info->irq_irq);
+	if (sn_irq_info->irq_int_bit != -1)
+		irq_set_handler(sn_irq_info->irq_irq, handle_level_irq);
 	spin_unlock(&sn_irq_info_lock);
 
 	register_intr_pda(sn_irq_info);

arch/ia64/sn/pci/pcibr/pcibr_provider.c

@@ -146,6 +146,7 @@ pcibr_bus_fixup(struct pcibus_bussoft *prom_bussoft, struct pci_controller *cont
 		printk(KERN_WARNING
 		       "pcibr cannot allocate interrupt for error handler\n");
 	}
+	irq_set_handler(SGI_PCIASIC_ERROR, handle_level_irq);
 	sn_set_err_irq_affinity(SGI_PCIASIC_ERROR);
 
 	/* 

arch/ia64/sn/pci/tioca_provider.c

@@ -649,6 +649,7 @@ tioca_bus_fixup(struct pcibus_bussoft *prom_bussoft, struct pci_controller *cont
 		       __func__, SGI_TIOCA_ERROR,
 		       (int)tioca_common->ca_common.bs_persist_busnum);
 
+	irq_set_handler(SGI_TIOCA_ERROR, handle_level_irq);
 	sn_set_err_irq_affinity(SGI_TIOCA_ERROR);
 
 	/* Setup locality information */

arch/ia64/sn/pci/tioce_provider.c

@@ -1037,6 +1037,7 @@ tioce_bus_fixup(struct pcibus_bussoft *prom_bussoft, struct pci_controller *cont
 		       tioce_common->ce_pcibus.bs_persist_segment,
 		       tioce_common->ce_pcibus.bs_persist_busnum);
 
+	irq_set_handler(SGI_PCIASIC_ERROR, handle_level_irq);
 	sn_set_err_irq_affinity(SGI_PCIASIC_ERROR);
 	return tioce_common;
 }

drivers/tty/serial/sn_console.c

@@ -743,6 +743,7 @@ static void __init sn_sal_switch_to_interrupts(struct sn_cons_port *port)
 			spin_lock_irqsave(&port->sc_port.lock, flags);
 			port->sc_port.irq = SGI_UART_VECTOR;
 			port->sc_ops = &intr_ops;
+			irq_set_handler(port->sc_port.irq, handle_level_irq);
 
 			/* turn on receive interrupts */
 			ia64_sn_console_intr_enable(SAL_CONSOLE_INTR_RECV);