virtio: Don't use PAGE_SIZE in virtio_pci.c

[firefly-linux-kernel-4.4.55.git] / include / linux / virtio_pci.h

diff --git a/include/linux/virtio_pci.h b/include/linux/virtio_pci.h
index cdef3574293274eb7fa61d7a34c9315cfbe6ab88..e13d7ebcf576bef6fd04f773f63a24b006b275ce 100644 (file)
--- a/include/linux/virtio_pci.h
+++ b/include/linux/virtio_pci.h
@@ -53,4 +53,8 @@
 
 /* Virtio ABI version, this must match exactly */
 #define VIRTIO_PCI_ABI_VERSION         0
+
+/* How many bits to shift physical queue address written to QUEUE_PFN.
+ * 12 is historical, and due to x86 page size. */
+#define VIRTIO_PCI_QUEUE_ADDR_SHIFT    12
 #endif