[IA64] altix: Abstract irq_affinity at the sn pci provider

Altix patch to abstract irq_affinity down to the pci provider level since
different SGI hardware implements this in different ways.
Signed-off-by: Mark Maule <maule@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/sn/kernel/irq.c

@@ -127,6 +127,7 @@ static void sn_set_affinity_irq(unsigned int irq, cpumask_t mask)
 		int local_widget, status;
 		nasid_t local_nasid;
 		struct sn_irq_info *new_irq_info;
+		struct sn_pcibus_provider *pci_provider;
 
 		new_irq_info = kmalloc(sizeof(struct sn_irq_info), GFP_ATOMIC);
 		if (new_irq_info == NULL)
@@ -166,8 +167,9 @@ static void sn_set_affinity_irq(unsigned int irq, cpumask_t mask)
 		new_irq_info->irq_cpuid = cpuid;
 		register_intr_pda(new_irq_info);
 
-		if (IS_PCI_BRIDGE_ASIC(new_irq_info->irq_bridge_type))
-			pcibr_change_devices_irq(new_irq_info);
+		pci_provider = sn_pci_provider[new_irq_info->irq_bridge_type];
+		if (pci_provider && pci_provider->target_interrupt)
+			(pci_provider->target_interrupt)(new_irq_info);
 
 		spin_lock(&sn_irq_info_lock);
 		list_replace_rcu(&sn_irq_info->list, &new_irq_info->list);

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

@@ -198,7 +198,7 @@ void pcibr_force_interrupt(struct sn_irq_info *sn_irq_info)
 	}
 }
 
-void pcibr_change_devices_irq(struct sn_irq_info *sn_irq_info)
+void pcibr_target_interrupt(struct sn_irq_info *sn_irq_info)
 {
 	struct pcidev_info *pcidev_info;
 	struct pcibus_info *pcibus_info;
@@ -233,7 +233,8 @@ struct sn_pcibus_provider pcibr_provider = {
 	.dma_map_consistent = pcibr_dma_map_consistent,
 	.dma_unmap = pcibr_dma_unmap,
 	.bus_fixup = pcibr_bus_fixup,
-	.force_interrupt = pcibr_force_interrupt
+	.force_interrupt = pcibr_force_interrupt,
+	.target_interrupt = pcibr_target_interrupt
 };
 
 int

arch/ia64/sn/pci/tioca_provider.c

@@ -657,7 +657,8 @@ static struct sn_pcibus_provider tioca_pci_interfaces = {
 	.dma_map_consistent = tioca_dma_map,
 	.dma_unmap = tioca_dma_unmap,
 	.bus_fixup = tioca_bus_fixup,
-	.force_interrupt = NULL
+	.force_interrupt = NULL,
+	.target_interrupt = NULL
 };
 
 /**

arch/ia64/sn/pci/tioce_provider.c

@@ -668,6 +668,43 @@ tioce_force_interrupt(struct sn_irq_info *sn_irq_info)
 	ce_mmr->ce_adm_force_int = force_int_val;
 }
 
+/**
+ * tioce_target_interrupt - implement set_irq_affinity for tioce resident
+ * functions.  Note:  only applies to line interrupts, not MSI's.
+ *
+ * @sn_irq_info: SN IRQ context
+ *
+ * Given an sn_irq_info, set the associated CE device's interrupt destination
+ * register.  Since the interrupt destination registers are on a per-ce-slot
+ * basis, this will retarget line interrupts for all functions downstream of
+ * the slot.
+ */
+static void
+tioce_target_interrupt(struct sn_irq_info *sn_irq_info)
+{
+	struct pcidev_info *pcidev_info;
+	struct tioce_common *ce_common;
+	struct tioce *ce_mmr;
+	int bit;
+
+	pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
+	if (!pcidev_info)
+		return;
+
+	ce_common = (struct tioce_common *)pcidev_info->pdi_pcibus_info;
+	ce_mmr = (struct tioce *)ce_common->ce_pcibus.bs_base;
+
+	bit = sn_irq_info->irq_int_bit;
+
+	ce_mmr->ce_adm_int_mask |= (1UL << bit);
+	ce_mmr->ce_adm_int_dest[bit] =
+		((uint64_t)sn_irq_info->irq_irq << INTR_VECTOR_SHFT) |
+			   sn_irq_info->irq_xtalkaddr;
+	ce_mmr->ce_adm_int_mask &= ~(1UL << bit);
+
+	tioce_force_interrupt(sn_irq_info);
+}
+
 /**
  * tioce_bus_fixup - perform final PCI fixup for a TIO CE bus
  * @prom_bussoft: Common prom/kernel struct representing the bus
@@ -719,7 +756,8 @@ static struct sn_pcibus_provider tioce_pci_interfaces = {
 	.dma_map_consistent = tioce_dma_consistent,
 	.dma_unmap = tioce_dma_unmap,
 	.bus_fixup = tioce_bus_fixup,
-	.force_interrupt = tioce_force_interrupt
+	.force_interrupt = tioce_force_interrupt,
+	.target_interrupt = tioce_target_interrupt
 };
 
 /**

include/asm-ia64/sn/pcibus_provider_defs.h

@@ -50,6 +50,7 @@ struct sn_pcibus_provider {
 	void		(*dma_unmap)(struct pci_dev *, dma_addr_t, int);
 	void *		(*bus_fixup)(struct pcibus_bussoft *, struct pci_controller *);
  	void		(*force_interrupt)(struct sn_irq_info *);
+ 	void		(*target_interrupt)(struct sn_irq_info *);
 };
 
 extern struct sn_pcibus_provider *sn_pci_provider[];