diff options
| author | Will Deacon | 2023-03-29 22:24:57 +0800 |
|---|---|---|
| committer | Tom Rini | 2023-04-25 11:53:15 -0400 |
| commit | 75582fc2e69ac18f03a144d78c6d136d5594c7f5 (patch) | |
| tree | 306381c64b4a898eb4dc90c703c2bd6520e2fae2 /include/virtio_ring.h | |
| parent | da4e8bb09d6ea33618335106ea6a1fc515128123 (diff) | |
virtio: Allocate virtqueue in page-size units
In preparation for explicit bouncing of virtqueue pages for devices
advertising the VIRTIO_F_IOMMU_PLATFORM feature, introduce a couple
of wrappers around virtqueue allocation and freeing operations,
ensuring that buffers are handled in terms of page-size units.
Signed-off-by: Will Deacon <willdeacon@google.com>
[ Paul: pick from the Android tree. Rebase to the upstream ]
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Link: https://android.googlesource.com/platform/external/u-boot/+/b4bb5227d4cf4fdfcd8b4e1ff2692d3a54d1482a
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/virtio_ring.h')
| -rw-r--r-- | include/virtio_ring.h | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/include/virtio_ring.h b/include/virtio_ring.h index c77c212cffd..8f8a55c7bd3 100644 --- a/include/virtio_ring.h +++ b/include/virtio_ring.h @@ -86,6 +86,7 @@ struct vring_used { struct vring { unsigned int num; + size_t size; struct vring_desc *desc; struct vring_avail *avail; struct vring_used *used; @@ -137,23 +138,24 @@ struct virtqueue { #define vring_used_event(vr) ((vr)->avail->ring[(vr)->num]) #define vring_avail_event(vr) (*(__virtio16 *)&(vr)->used->ring[(vr)->num]) +static inline unsigned int vring_size(unsigned int num, unsigned long align) +{ + return ((sizeof(struct vring_desc) * num + + sizeof(__virtio16) * (3 + num) + align - 1) & ~(align - 1)) + + sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num; +} + static inline void vring_init(struct vring *vr, unsigned int num, void *p, unsigned long align) { vr->num = num; + vr->size = vring_size(num, align); vr->desc = p; vr->avail = p + num * sizeof(struct vring_desc); vr->used = (void *)(((uintptr_t)&vr->avail->ring[num] + sizeof(__virtio16) + align - 1) & ~(align - 1)); } -static inline unsigned int vring_size(unsigned int num, unsigned long align) -{ - return ((sizeof(struct vring_desc) * num + - sizeof(__virtio16) * (3 + num) + align - 1) & ~(align - 1)) + - sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num; -} - /* * The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX. * Assuming a given event_idx value from the other side, if we have just |