diff options
Diffstat (limited to 'include/linux/virtio_config.h')
| -rw-r--r-- | include/linux/virtio_config.h | 43 |
1 files changed, 21 insertions, 22 deletions
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index b3e1d30c765b..918cf25cd3c6 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -77,7 +77,11 @@ struct virtqueue_info { * vdev: the virtio_device * @get_features: get the array of feature bits for this device. * vdev: the virtio_device - * Returns the first 64 feature bits (all we currently need). + * Returns the first 64 feature bits. + * @get_extended_features: + * vdev: the virtio_device + * Returns the first VIRTIO_FEATURES_MAX feature bits (all we currently + * need). * @finalize_features: confirm what device features we'll be using. * vdev: the virtio_device * This sends the driver feature bits to the device: it can change @@ -121,6 +125,8 @@ struct virtio_config_ops { void (*del_vqs)(struct virtio_device *); void (*synchronize_cbs)(struct virtio_device *); u64 (*get_features)(struct virtio_device *vdev); + void (*get_extended_features)(struct virtio_device *vdev, + u64 *features); int (*finalize_features)(struct virtio_device *vdev); const char *(*bus_name)(struct virtio_device *vdev); int (*set_vq_affinity)(struct virtqueue *vq, @@ -147,13 +153,7 @@ void virtio_check_driver_offered_feature(const struct virtio_device *vdev, static inline bool __virtio_test_bit(const struct virtio_device *vdev, unsigned int fbit) { - /* Did you forget to fix assumptions on max features? */ - if (__builtin_constant_p(fbit)) - BUILD_BUG_ON(fbit >= 64); - else - BUG_ON(fbit >= 64); - - return vdev->features & BIT_ULL(fbit); + return virtio_features_test_bit(vdev->features_array, fbit); } /** @@ -164,13 +164,7 @@ static inline bool __virtio_test_bit(const struct virtio_device *vdev, static inline void __virtio_set_bit(struct virtio_device *vdev, unsigned int fbit) { - /* Did you forget to fix assumptions on max features? */ - if (__builtin_constant_p(fbit)) - BUILD_BUG_ON(fbit >= 64); - else - BUG_ON(fbit >= 64); - - vdev->features |= BIT_ULL(fbit); + virtio_features_set_bit(vdev->features_array, fbit); } /** @@ -181,13 +175,7 @@ static inline void __virtio_set_bit(struct virtio_device *vdev, static inline void __virtio_clear_bit(struct virtio_device *vdev, unsigned int fbit) { - /* Did you forget to fix assumptions on max features? */ - if (__builtin_constant_p(fbit)) - BUILD_BUG_ON(fbit >= 64); - else - BUG_ON(fbit >= 64); - - vdev->features &= ~BIT_ULL(fbit); + virtio_features_clear_bit(vdev->features_array, fbit); } /** @@ -204,6 +192,17 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev, return __virtio_test_bit(vdev, fbit); } +static inline void virtio_get_features(struct virtio_device *vdev, + u64 *features) +{ + if (vdev->config->get_extended_features) { + vdev->config->get_extended_features(vdev, features); + return; + } + + virtio_features_from_u64(features, vdev->config->get_features(vdev)); +} + /** * virtio_has_dma_quirk - determine whether this device has the DMA quirk * @vdev: the device |