Merge tag 'drm-vc4-fixes-2016-09-14' of https://github.com/anholt/linux into drm...

[deliverable/linux.git] / tools / virtio / linux / virtio_config.h

diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h
index 57a6964a1e355b8daa154adff9bd007c93f8374f..9ba11815e0a16b93ec0e04735a3486ac9dc6bfe4 100644 (file)
--- a/tools/virtio/linux/virtio_config.h
+++ b/tools/virtio/linux/virtio_config.h
@@ -40,6 +40,19 @@ static inline void __virtio_clear_bit(struct virtio_device *vdev,
 #define virtio_has_feature(dev, feature) \
        (__virtio_test_bit((dev), feature))
 
+/**
+ * virtio_has_iommu_quirk - determine whether this device has the iommu quirk
+ * @vdev: the device
+ */
+static inline bool virtio_has_iommu_quirk(const struct virtio_device *vdev)
+{
+       /*
+        * Note the reverse polarity of the quirk feature (compared to most
+        * other features), this is for compatibility with legacy systems.
+        */
+       return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
+}
+
 static inline bool virtio_is_little_endian(struct virtio_device *vdev)
 {
        return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||