powerpc: more iseries irq work

Make get_IRQ return a pending irq number so it can be handled
in the powerpc geeneric code.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 33 insertions, 20 deletions

diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
index 5e92149b9b96..42e978e4897a 100644
--- a/arch/powerpc/platforms/iseries/irq.c
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -82,31 +82,29 @@ struct pci_event {
         } data;
 };
 
+static DEFINE_SPINLOCK(pending_irqs_lock);
+static int num_pending_irqs;
+static int pending_irqs[NR_IRQS];
+
 static void int_received(struct pci_event *event, struct pt_regs *regs)
 {
         int irq;
-#ifdef CONFIG_IRQSTACKS
-        struct thread_info *curtp, *irqtp;
-#endif
 
         switch (event->event.xSubtype) {
         case pe_slot_interrupt:
                 irq = event->event.xCorrelationToken;
-                /* Dispatch the interrupt handlers for this irq */
-#ifdef CONFIG_IRQSTACKS
-                /* Switch to the irq stack to handle this */
-                curtp = current_thread_info();
-                irqtp = hardirq_ctx[smp_processor_id()];
-                if (curtp != irqtp) {
-                        irqtp->task = curtp->task;
-                        irqtp->flags = 0;
-                        call___do_IRQ(irq, regs, irqtp);
-                        irqtp->task = NULL;
-                        if (irqtp->flags)
-                                set_bits(irqtp->flags, &curtp->flags);
-                } else
-#endif
-                        __do_IRQ(irq, regs);
+                if (irq < NR_IRQS) {
+                        spin_lock(&pending_irqs_lock);
+                        pending_irqs[irq]++;
+                        num_pending_irqs++;
+                        spin_unlock(&pending_irqs_lock);
+                } else {
+                        printk(KERN_WARNING "int_received: bad irq number %d\n",
+                                        irq);
+                        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:
@@ -342,6 +340,8 @@ int __init iSeries_allocate_IRQ(HvBusNumber bus,
 int iSeries_get_irq(struct pt_regs *regs)
 {
         struct paca_struct *lpaca;
+        /* -2 means ignore this interrupt */
+        int irq = -2;
 
         lpaca = get_paca();
 #ifdef CONFIG_SMP
@@ -353,6 +353,19 @@ int iSeries_get_irq(struct pt_regs *regs)
         if (hvlpevent_is_pending())
                 process_hvlpevents(regs);
 
-        /* -2 means ignore this interrupt */
-        return -2;
+        if (num_pending_irqs) {
+                spin_lock(&pending_irqs_lock);
+                for (irq = 0; irq < NR_IRQS; irq++) {
+                        if (pending_irqs[irq]) {
+                                pending_irqs[irq]--;
+                                num_pending_irqs--;
+                                break;
+                        }
+                }
+                spin_unlock(&pending_irqs_lock);
+                if (irq >= NR_IRQS)
+                        irq = -2;
+        }
+
+        return irq;
 }