[IA64-SGI] abstract force_interrupt() mechanism

Altix patch to abstract the force_interrupt() mechanism away from the
pcibr provider.

Signed-off-by: Mark Maule <maule@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

3 files changed, 33 insertions, 22 deletions

diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index 84d276a14ecb..af061dba246f 100644
--- a/arch/ia64/sn/kernel/irq.c
+++ b/arch/ia64/sn/kernel/irq.c
@@ -317,6 +317,16 @@ void sn_irq_unfixup(struct pci_dev *pci_dev)
         pci_dev_put(pci_dev);
 }
 
+static inline void
+sn_call_force_intr_provider(struct sn_irq_info *sn_irq_info)
+{
+        struct sn_pcibus_provider *pci_provider;
+
+        pci_provider = sn_pci_provider[sn_irq_info->irq_bridge_type];
+        if (pci_provider && pci_provider->force_interrupt)
+                (*pci_provider->force_interrupt)(sn_irq_info);
+}
+
 static void force_interrupt(int irq)
 {
         struct sn_irq_info *sn_irq_info;
@@ -325,11 +335,9 @@ static void force_interrupt(int irq)
                 return;
 
         rcu_read_lock();
-        list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[irq], list) {
-                if (IS_PCI_BRIDGE_ASIC(sn_irq_info->irq_bridge_type) &&
-                    (sn_irq_info->irq_bridge != NULL))
-                        pcibr_force_interrupt(sn_irq_info);
-        }
+        list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[irq], list)
+                sn_call_force_intr_provider(sn_irq_info);
+
         rcu_read_unlock();
 }
 
@@ -351,6 +359,14 @@ static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
         struct pcidev_info *pcidev_info;
         struct pcibus_info *pcibus_info;
 
+        /*
+         * Bridge types attached to TIO (anything but PIC) do not need this WAR
+         * since they do not target Shub II interrupt registers.  If that
+         * ever changes, this check needs to accomodate.
+         */
+        if (sn_irq_info->irq_bridge_type != PCIIO_ASIC_TYPE_PIC)
+                return;
+
         pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
         if (!pcidev_info)
                 return;
@@ -377,16 +393,12 @@ static void sn_check_intr(int irq, struct sn_irq_info *sn_irq_info)
                 break;
         }
         if (!test_bit(irr_bit, &irr_reg)) {
-                if (!test_bit(irq, pda->sn_soft_irr)) {
-                        if (!test_bit(irq, pda->sn_in_service_ivecs)) {
-                                regval &= 0xff;
-                                if (sn_irq_info->irq_int_bit & regval &
-                                    sn_irq_info->irq_last_intr) {
-                                        regval &=
-                                            ~(sn_irq_info->
-                                              irq_int_bit & regval);
-                                        pcibr_force_interrupt(sn_irq_info);
-                                }
+                if (!test_bit(irq, pda->sn_in_service_ivecs)) {
+                        regval &= 0xff;
+                        if (sn_irq_info->irq_int_bit & regval &
+                            sn_irq_info->irq_last_intr) {
+                                regval &= ~(sn_irq_info->irq_int_bit & regval);
+                                sn_call_force_intr_provider(sn_irq_info);
                         }
                 }
         }
@@ -404,13 +416,7 @@ void sn_lb_int_war_check(void)
         rcu_read_lock();
         for (i = pda->sn_first_irq; i <= pda->sn_last_irq; i++) {
                 list_for_each_entry_rcu(sn_irq_info, sn_irq_lh[i], list) {
-                        /*
-                         * Only call for PCI bridges that are fully
-                         * initialized.
-                         */
-                        if (IS_PCI_BRIDGE_ASIC(sn_irq_info->irq_bridge_type) &&
-                            (sn_irq_info->irq_bridge != NULL))
-                                sn_check_intr(i, sn_irq_info);
+                        sn_check_intr(i, sn_irq_info);
                 }
         }
         rcu_read_unlock();
diff --git a/arch/ia64/sn/pci/pcibr/pcibr_provider.c b/arch/ia64/sn/pci/pcibr/pcibr_provider.c
index f8cfe8acdc3c..ff9c7de925d1 100644
--- a/arch/ia64/sn/pci/pcibr/pcibr_provider.c
+++ b/arch/ia64/sn/pci/pcibr/pcibr_provider.c
@@ -178,6 +178,9 @@ void pcibr_force_interrupt(struct sn_irq_info *sn_irq_info)
         struct pcibus_info *pcibus_info;
         int bit = sn_irq_info->irq_int_bit;
 
+        if (! sn_irq_info->irq_bridge)
+                return;
+
         pcidev_info = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
         if (pcidev_info) {
                 pcibus_info =
@@ -222,6 +225,7 @@ 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
 };
 
 int
diff --git a/arch/ia64/sn/pci/tioca_provider.c b/arch/ia64/sn/pci/tioca_provider.c
index 2fef7c10d6e5..4ea04cfa30ff 100644
--- a/arch/ia64/sn/pci/tioca_provider.c
+++ b/arch/ia64/sn/pci/tioca_provider.c
@@ -657,6 +657,7 @@ 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
 };
 
 /**