diff options
| author | Jason Wang <jasowang@redhat.com> | 2021-01-04 14:54:51 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2021-02-23 07:52:57 -0500 |
| commit | 0b0177089c60236b6a785346cfaab081acd9be26 (patch) | |
| tree | ae7f63f887ff29935a3d6531ed03fcdda063eecd /drivers/virtio | |
| parent | e3669129fdcd2494e6991bd4111e090551087e16 (diff) | |
virtio-pci-modern: introduce helpers for setting and getting features
This patch introduces helpers for setting and getting features.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210104065503.199631-8-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_pci_modern.c | 43 |
1 files changed, 33 insertions, 10 deletions
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index ccde0a41209a..cb14fc334a9c 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -137,12 +137,16 @@ static void __iomem *map_capability(struct pci_dev *dev, int off, return p; } -/* virtio config->get_features() implementation */ -static u64 vp_get_features(struct virtio_device *vdev) +/* + * vp_modern_get_features - get features from device + * @mdev: the modern virtio-pci device + * + * Returns the features read from the device + */ +static u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev) { - struct virtio_pci_device *vp_dev = to_vp_device(vdev); - struct virtio_pci_modern_device *mdev = &vp_dev->mdev; struct virtio_pci_common_cfg __iomem *cfg = mdev->common; + u64 features; vp_iowrite32(0, &cfg->device_feature_select); @@ -153,6 +157,14 @@ static u64 vp_get_features(struct virtio_device *vdev) return features; } +/* virtio config->get_features() implementation */ +static u64 vp_get_features(struct virtio_device *vdev) +{ + struct virtio_pci_device *vp_dev = to_vp_device(vdev); + + return vp_modern_get_features(&vp_dev->mdev); +} + static void vp_transport_features(struct virtio_device *vdev, u64 features) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); @@ -163,12 +175,26 @@ static void vp_transport_features(struct virtio_device *vdev, u64 features) __virtio_set_bit(vdev, VIRTIO_F_SR_IOV); } +/* + * vp_modern_set_features - set features to device + * @mdev: the modern virtio-pci device + * @features: the features set to device + */ +static void vp_modern_set_features(struct virtio_pci_modern_device *mdev, + u64 features) +{ + struct virtio_pci_common_cfg __iomem *cfg = mdev->common; + + vp_iowrite32(0, &cfg->guest_feature_select); + vp_iowrite32((u32)features, &cfg->guest_feature); + vp_iowrite32(1, &cfg->guest_feature_select); + vp_iowrite32(features >> 32, &cfg->guest_feature); +} + /* virtio config->finalize_features() implementation */ static int vp_finalize_features(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); - struct virtio_pci_modern_device *mdev = &vp_dev->mdev; - struct virtio_pci_common_cfg __iomem *cfg = mdev->common; u64 features = vdev->features; /* Give virtio_ring a chance to accept features. */ @@ -183,10 +209,7 @@ static int vp_finalize_features(struct virtio_device *vdev) return -EINVAL; } - vp_iowrite32(0, &cfg->guest_feature_select); - vp_iowrite32((u32)vdev->features, &cfg->guest_feature); - vp_iowrite32(1, &cfg->guest_feature_select); - vp_iowrite32(vdev->features >> 32, &cfg->guest_feature); + vp_modern_set_features(&vp_dev->mdev, vdev->features); return 0; } |