hw/pci-host/gpex: Set INTx index/gsi mapping

To implement INTx to gsi routing we need to pass the gpex host
bridge the gsi associated to each INTx index. Let's introduce
irq_num array and gpex_set_irq_num setter function.
Signed-off-by: NPranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: NTushar Jagad <tushar.jagad@linaro.org>
Signed-off-by: NEric Auger <eric.auger@redhat.com>
Tested-by: NFeng Kan <fkan@apm.com>
Reviewed-by: NAndrew Jones <drjones@redhat.com>
Message-id: 1505296004-6798-2-git-send-email-eric.auger@redhat.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/pci-host/gpex.c

@@ -43,6 +43,16 @@ static void gpex_set_irq(void *opaque, int irq_num, int level)
     qemu_set_irq(s->irq[irq_num], level);
 }
 
+int gpex_set_irq_num(GPEXHost *s, int index, int gsi)
+{
+    if (index >= GPEX_NUM_IRQS) {
+        return -EINVAL;
+    }
+
+    s->irq_num[index] = gsi;
+    return 0;
+}
+
 static void gpex_host_realize(DeviceState *dev, Error **errp)
 {
     PCIHostState *pci = PCI_HOST_BRIDGE(dev);

include/hw/pci-host/gpex.h

@@ -51,6 +51,9 @@ typedef struct GPEXHost {
     MemoryRegion io_ioport;
     MemoryRegion io_mmio;
     qemu_irq irq[GPEX_NUM_IRQS];
+    int irq_num[GPEX_NUM_IRQS];
 } GPEXHost;
 
+int gpex_set_irq_num(GPEXHost *s, int index, int gsi);
+
 #endif /* HW_GPEX_H */