virtio_pci: add isr field
Use isr field instead of direct access to ioaddr.
This way generalizes easily to virtio 1.0.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 9be59d9..ee1b54c 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -40,6 +40,9 @@
/* the IO mapping for the PCI config space */
void __iomem *ioaddr;
+ /* the IO mapping for ISR operation */
+ void __iomem *isr;
+
/* a list of queues so we can dispatch IRQs */
spinlock_t lock;
struct list_head virtqueues;
@@ -248,7 +251,7 @@
/* reading the ISR has the effect of also clearing it so it's very
* important to save off the value. */
- isr = ioread8(vp_dev->ioaddr + VIRTIO_PCI_ISR);
+ isr = ioread8(vp_dev->isr);
/* It's definitely not us if the ISR was not high */
if (!isr)
@@ -719,6 +722,8 @@
goto out_req_regions;
}
+ vp_dev->isr = vp_dev->ioaddr + VIRTIO_PCI_ISR;
+
pci_set_drvdata(pci_dev, vp_dev);
pci_set_master(pci_dev);
