devices: proxy - Add support for proxying PciDevices

PCI adds a configuration space to the existing memory mapped IO
supported by BusDevices.

Add the ability to set configuration space as optional to the BusDevice
trait so that ProxyDevice can be shared.

PCI devices can have more than one memory mapped region. Expand the bus
so that it has the ability to pass an absolute address instead of an
offset. This will allow the PCI device to know which BAR is being
written to.

Change-Id: I055cd516c49a74316a9547df471290f05d865b0a
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1103663
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/linux.rs b/src/linux.rs
index 1c524db..80c1b0f 100644
--- a/src/linux.rs
+++ b/src/linux.rs
@@ -320,13 +320,15 @@ fn register_mmio(bus: &mut devices::Bus,
         bus
             .insert(Arc::new(Mutex::new(proxy_dev)),
             mmio_base,
-            mmio_len)
+            mmio_len,
+            false)
             .unwrap();
     } else {
         bus
             .insert(Arc::new(Mutex::new(mmio_device)),
             mmio_base,
-            mmio_len)
+            mmio_len,
+            false)
             .unwrap();
     }