[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>

5 files changed, 49 insertions, 6 deletions

diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index 607938c288b..9fc74631ba8 100644
--- a/arch/ia64/sn/kernel/irq.c
+++ b/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);
diff --git a/arch/ia64/sn/pci/pcibr/pcibr_provider.c b/arch/ia64/sn/pci/pcibr/pcibr_provider.c
index 5862a709adf..7b03b8084ff 100644
--- a/arch/ia64/sn/pci/pcibr/pcibr_provider.c
+++ b/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
diff --git a/arch/ia64/sn/pci/tioca_provider.c b/arch/ia64/sn/pci/tioca_provider.c
index 4ea04cfa30f..ea09c12f025 100644
--- a/arch/ia64/sn/pci/tioca_provider.c
+++ b/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
 };
 
 /**
diff --git a/arch/ia64/sn/pci/tioce_provider.c b/arch/ia64/sn/pci/tioce_provider.c
index d9081369cf9..8e75db2b825 100644
--- a/arch/ia64/sn/pci/tioce_provider.c
+++ b/arch/ia64/sn/pci/tioce_provider.c
@@ -669,6 +669,43 @@ tioce_force_interrupt(struct sn_irq_info *sn_irq_info)
 }
 
 /**
+ * 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
 };
 
 /**
diff --git a/include/asm-ia64/sn/pcibus_provider_defs.h b/include/asm-ia64/sn/pcibus_provider_defs.h
index 5a92f5149a9..ad0e8e8ae53 100644
--- a/include/asm-ia64/sn/pcibus_provider_defs.h
+++ b/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[];