diff --git a/drivers/virtio/virtio_pci_modern_dev.c b/drivers/virtio/virtio_pci_modern_dev.c index 54f29702858626fda4c18ca5105335e80495e954..e11ed748e66131d2a51afcc4423efa7ae640b1ce 100644 --- a/drivers/virtio/virtio_pci_modern_dev.c +++ b/drivers/virtio/virtio_pci_modern_dev.c @@ -383,6 +383,27 @@ u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev) } EXPORT_SYMBOL_GPL(vp_modern_get_features); +/* + * vp_modern_get_driver_features - get driver features from device + * @mdev: the modern virtio-pci device + * + * Returns the driver features read from the device + */ +u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev) +{ + struct virtio_pci_common_cfg __iomem *cfg = mdev->common; + + u64 features; + + vp_iowrite32(0, &cfg->guest_feature_select); + features = vp_ioread32(&cfg->guest_feature); + vp_iowrite32(1, &cfg->guest_feature_select); + features |= ((u64)vp_ioread32(&cfg->guest_feature) << 32); + + return features; +} +EXPORT_SYMBOL_GPL(vp_modern_get_driver_features); + /* * vp_modern_set_features - set features to device * @mdev: the modern virtio-pci device diff --git a/include/linux/virtio_pci_modern.h b/include/linux/virtio_pci_modern.h index 6a95b58fd0f47a85c3b68550c60c9031ba677b29..eb2bd9b4077defc9a884cdb0dc1bf47111a4dd3b 100644 --- a/include/linux/virtio_pci_modern.h +++ b/include/linux/virtio_pci_modern.h @@ -79,6 +79,7 @@ static inline void vp_iowrite64_twopart(u64 val, } u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev); +u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev); void vp_modern_set_features(struct virtio_pci_modern_device *mdev, u64 features); u32 vp_modern_generation(struct virtio_pci_modern_device *mdev);