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authorFeng Liu <feliu@nvidia.com>2023-03-10 07:34:28 +0200
committerMichael S. Tsirkin <mst@redhat.com>2023-04-21 03:02:30 -0400
commit4b6ec919b84830949313c805c586fb34f141ce0c (patch)
tree9ea84e743a3153a851b64387c5c4f1523782aba7 /drivers/virtio
parent1adbd6b2fc0c09645c4c30c5eb47beaa3e6ea4b4 (diff)
virtio_ring: Use const to annotate read-only pointer params
Add const to make the read-only pointer parameters clear, similar to many existing functions. To implement this change, the commit also introduces the use of `container_of_const` to implement `to_vvq`, which ensures the const-ness of read-only parameters and avoids accidental modification of their members. Signed-off-by: Feng Liu <feliu@nvidia.com> Reviewed-by: Jiri Pirko <jiri@nvidia.com> Reviewed-by: Parav Pandit <parav@nvidia.com> Reviewed-by: Gavin Li <gavinl@nvidia.com> Reviewed-by: Bodong Wang <bodong@nvidia.com> Message-Id: <20230310053428.3376-4-feliu@nvidia.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_ring.c36
1 files changed, 18 insertions, 18 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index a26fab91c59f..4c3bb0ddeb9b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -231,9 +231,9 @@ static void vring_free(struct virtqueue *_vq);
* Helpers.
*/
-#define to_vvq(_vq) container_of(_vq, struct vring_virtqueue, vq)
+#define to_vvq(_vq) container_of_const(_vq, struct vring_virtqueue, vq)
-static bool virtqueue_use_indirect(struct vring_virtqueue *vq,
+static bool virtqueue_use_indirect(const struct vring_virtqueue *vq,
unsigned int total_sg)
{
/*
@@ -269,7 +269,7 @@ static bool virtqueue_use_indirect(struct vring_virtqueue *vq,
* unconditionally on data path.
*/
-static bool vring_use_dma_api(struct virtio_device *vdev)
+static bool vring_use_dma_api(const struct virtio_device *vdev)
{
if (!virtio_has_dma_quirk(vdev))
return true;
@@ -289,7 +289,7 @@ static bool vring_use_dma_api(struct virtio_device *vdev)
return false;
}
-size_t virtio_max_dma_size(struct virtio_device *vdev)
+size_t virtio_max_dma_size(const struct virtio_device *vdev)
{
size_t max_segment_size = SIZE_MAX;
@@ -423,7 +423,7 @@ static void virtqueue_init(struct vring_virtqueue *vq, u32 num)
*/
static void vring_unmap_one_split_indirect(const struct vring_virtqueue *vq,
- struct vring_desc *desc)
+ const struct vring_desc *desc)
{
u16 flags;
@@ -1183,7 +1183,7 @@ static u16 packed_last_used(u16 last_used_idx)
}
static void vring_unmap_extra_packed(const struct vring_virtqueue *vq,
- struct vring_desc_extra *extra)
+ const struct vring_desc_extra *extra)
{
u16 flags;
@@ -1206,7 +1206,7 @@ static void vring_unmap_extra_packed(const struct vring_virtqueue *vq,
}
static void vring_unmap_desc_packed(const struct vring_virtqueue *vq,
- struct vring_packed_desc *desc)
+ const struct vring_packed_desc *desc)
{
u16 flags;
@@ -2786,10 +2786,10 @@ EXPORT_SYMBOL_GPL(vring_transport_features);
* Returns the size of the vring. This is mainly used for boasting to
* userspace. Unlike other operations, this need not be serialized.
*/
-unsigned int virtqueue_get_vring_size(struct virtqueue *_vq)
+unsigned int virtqueue_get_vring_size(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
return vq->packed_ring ? vq->packed.vring.num : vq->split.vring.num;
}
@@ -2819,9 +2819,9 @@ void __virtqueue_unbreak(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(__virtqueue_unbreak);
-bool virtqueue_is_broken(struct virtqueue *_vq)
+bool virtqueue_is_broken(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
return READ_ONCE(vq->broken);
}
@@ -2868,9 +2868,9 @@ void __virtio_unbreak_device(struct virtio_device *dev)
}
EXPORT_SYMBOL_GPL(__virtio_unbreak_device);
-dma_addr_t virtqueue_get_desc_addr(struct virtqueue *_vq)
+dma_addr_t virtqueue_get_desc_addr(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
BUG_ON(!vq->we_own_ring);
@@ -2881,9 +2881,9 @@ dma_addr_t virtqueue_get_desc_addr(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_get_desc_addr);
-dma_addr_t virtqueue_get_avail_addr(struct virtqueue *_vq)
+dma_addr_t virtqueue_get_avail_addr(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
BUG_ON(!vq->we_own_ring);
@@ -2895,9 +2895,9 @@ dma_addr_t virtqueue_get_avail_addr(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_get_avail_addr);
-dma_addr_t virtqueue_get_used_addr(struct virtqueue *_vq)
+dma_addr_t virtqueue_get_used_addr(const struct virtqueue *_vq)
{
- struct vring_virtqueue *vq = to_vvq(_vq);
+ const struct vring_virtqueue *vq = to_vvq(_vq);
BUG_ON(!vq->we_own_ring);
@@ -2910,7 +2910,7 @@ dma_addr_t virtqueue_get_used_addr(struct virtqueue *_vq)
EXPORT_SYMBOL_GPL(virtqueue_get_used_addr);
/* Only available for split ring */
-const struct vring *virtqueue_get_vring(struct virtqueue *vq)
+const struct vring *virtqueue_get_vring(const struct virtqueue *vq)
{
return &to_vvq(vq)->split.vring;
}