virtio-gpu: add a BAR for device

BUG=chromium:924405
TEST=compile

Change-Id: I8a583df2a9db4ea7e066eb284eac54fc62580350
Reviewed-on: https://chromium-review.googlesource.com/1480744
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Tested-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/devices/src/virtio/gpu/mod.rs b/devices/src/virtio/gpu/mod.rs
index c8d4dcd..0047bbd 100644
--- a/devices/src/virtio/gpu/mod.rs
+++ b/devices/src/virtio/gpu/mod.rs
@@ -36,6 +36,7 @@ use super::{
 
 use self::backend::Backend;
 use self::protocol::*;
+use pci::{PciBarConfiguration, PciBarPrefetchable, PciBarRegionType};
 
 // First queue is for virtio gpu commands. Second queue is for cursor commands, which we expect
 // there to be fewer of.
@@ -809,4 +810,16 @@ impl VirtioDevice for Gpu {
             return;
         }
     }
+
+    // Require 1 BAR for mapping 3D buffers
+    fn get_device_bars(&self) -> Option<Vec<PciBarConfiguration>> {
+        let mut bars = Vec::new();
+        bars.push(PciBarConfiguration::new(
+            4,
+            1 << 33,
+            PciBarRegionType::Memory64BitRegion,
+            PciBarPrefetchable::NotPrefetchable,
+        ));
+        Some(bars)
+    }
 }