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virtio_ring: constify virtqueue pointer for DMA helpers

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This patch constifies the virtqueue pointer for DMA helpers.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Reviewed-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20250821064641.5025-2-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Eugenio Pérez <eperezma@redhat.com>
This commit is contained in:
Jason Wang 2025-08-21 14:46:33 +08:00 committed by Michael S. Tsirkin
parent 642d82e3c3
commit 7d096cb3e1
2 changed files with 19 additions and 18 deletions
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25
drivers/virtio/virtio_ring.c
View File

@ -3149,12 +3149,12 @@ EXPORT_SYMBOL_GPL(virtqueue_get_vring);
*
* return DMA address. Caller should check that by virtqueue_dma_mapping_error().
*/
dma_addr_t virtqueue_dma_map_single_attrs(struct virtqueue *_vq, void *ptr,
dma_addr_t virtqueue_dma_map_single_attrs(const struct virtqueue *_vq, void *ptr,
size_t size,
enum dma_data_direction dir,
unsigned long attrs)
{
struct vring_virtqueue *vq = to_vvq(_vq);
const struct vring_virtqueue *vq = to_vvq(_vq);
if (!vq->use_dma_api) {
kmsan_handle_dma(virt_to_page(ptr), offset_in_page(ptr), size, dir);
@ -3176,11 +3176,12 @@ EXPORT_SYMBOL_GPL(virtqueue_dma_map_single_attrs);
* Unmap the address that is mapped by the virtqueue_dma_map_* APIs.
*
*/
void virtqueue_dma_unmap_single_attrs(struct virtqueue *_vq, dma_addr_t addr,
void virtqueue_dma_unmap_single_attrs(const struct virtqueue *_vq,
dma_addr_t addr,
size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
struct vring_virtqueue *vq = to_vvq(_vq);
const struct vring_virtqueue *vq = to_vvq(_vq);
if (!vq->use_dma_api)
return;
@ -3196,9 +3197,9 @@ EXPORT_SYMBOL_GPL(virtqueue_dma_unmap_single_attrs);
*
* Returns 0 means dma valid. Other means invalid dma address.
*/
int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr)
int virtqueue_dma_mapping_error(const struct virtqueue *_vq, dma_addr_t addr)
{
struct vring_virtqueue *vq = to_vvq(_vq);
const struct vring_virtqueue *vq = to_vvq(_vq);
if (!vq->use_dma_api)
return 0;
@ -3217,9 +3218,9 @@ EXPORT_SYMBOL_GPL(virtqueue_dma_mapping_error);
*
* return bool
*/
bool virtqueue_dma_need_sync(struct virtqueue *_vq, dma_addr_t addr)
bool virtqueue_dma_need_sync(const struct virtqueue *_vq, dma_addr_t addr)
{
struct vring_virtqueue *vq = to_vvq(_vq);
const struct vring_virtqueue *vq = to_vvq(_vq);
if (!vq->use_dma_api)
return false;
@ -3240,12 +3241,12 @@ EXPORT_SYMBOL_GPL(virtqueue_dma_need_sync);
* the DMA address really needs to be synchronized
*
*/
void virtqueue_dma_sync_single_range_for_cpu(struct virtqueue *_vq,
void virtqueue_dma_sync_single_range_for_cpu(const struct virtqueue *_vq,
dma_addr_t addr,
unsigned long offset, size_t size,
enum dma_data_direction dir)
{
struct vring_virtqueue *vq = to_vvq(_vq);
const struct vring_virtqueue *vq = to_vvq(_vq);
struct device *dev = vring_dma_dev(vq);
if (!vq->use_dma_api)
@ -3266,12 +3267,12 @@ EXPORT_SYMBOL_GPL(virtqueue_dma_sync_single_range_for_cpu);
* Before calling this function, use virtqueue_dma_need_sync() to confirm that
* the DMA address really needs to be synchronized
*/
void virtqueue_dma_sync_single_range_for_device(struct virtqueue *_vq,
void virtqueue_dma_sync_single_range_for_device(const struct virtqueue *_vq,
dma_addr_t addr,
unsigned long offset, size_t size,
enum dma_data_direction dir)
{
struct vring_virtqueue *vq = to_vvq(_vq);
const struct vring_virtqueue *vq = to_vvq(_vq);
struct device *dev = vring_dma_dev(vq);
if (!vq->use_dma_api)

12
include/linux/virtio.h
View File

@ -262,18 +262,18 @@ void unregister_virtio_driver(struct virtio_driver *drv);
module_driver(__virtio_driver, register_virtio_driver, \
unregister_virtio_driver)
dma_addr_t virtqueue_dma_map_single_attrs(struct virtqueue *_vq, void *ptr, size_t size,
dma_addr_t virtqueue_dma_map_single_attrs(const struct virtqueue *_vq, void *ptr, size_t size,
enum dma_data_direction dir, unsigned long attrs);
void virtqueue_dma_unmap_single_attrs(struct virtqueue *_vq, dma_addr_t addr,
void virtqueue_dma_unmap_single_attrs(const struct virtqueue *_vq, dma_addr_t addr,
size_t size, enum dma_data_direction dir,
unsigned long attrs);
int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr);
int virtqueue_dma_mapping_error(const struct virtqueue *_vq, dma_addr_t addr);
bool virtqueue_dma_need_sync(struct virtqueue *_vq, dma_addr_t addr);
void virtqueue_dma_sync_single_range_for_cpu(struct virtqueue *_vq, dma_addr_t addr,
bool virtqueue_dma_need_sync(const struct virtqueue *_vq, dma_addr_t addr);
void virtqueue_dma_sync_single_range_for_cpu(const struct virtqueue *_vq, dma_addr_t addr,
unsigned long offset, size_t size,
enum dma_data_direction dir);
void virtqueue_dma_sync_single_range_for_device(struct virtqueue *_vq, dma_addr_t addr,
void virtqueue_dma_sync_single_range_for_device(const struct virtqueue *_vq, dma_addr_t addr,
unsigned long offset, size_t size,
enum dma_data_direction dir);