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virtio: Allocate bounce buffers for devices with VIRTIO_F_IOMMU_PLATFORM

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In preparation for bouncing virtio data for devices advertising the
VIRTIO_F_IOMMU_PLATFORM feature, allocate an array of bounce buffer
structures in the vring, one per descriptor.

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: 3e052749e7
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Will Deacon 2023-03-29 22:24:59 +08:00 committed by Tom Rini
parent a15d67e01a
commit 37e53db38b
2 changed files with 24 additions and 6 deletions
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25
drivers/virtio/virtio_ring.c
View file

@ -6,6 +6,7 @@
* virtio ring implementation
*/
#include <bouncebuf.h>
#include <common.h>
#include <dm.h>
#include <log.h>
@ -292,6 +293,7 @@ struct virtqueue *vring_create_virtqueue(unsigned int index, unsigned int num,
struct udevice *vdev = uc_priv->vdev;
struct virtqueue *vq;
void *queue = NULL;
struct bounce_buffer *bbs = NULL;
struct vring vring;
/* We assume num is a power of 2 */
@ -320,17 +322,29 @@ struct virtqueue *vring_create_virtqueue(unsigned int index, unsigned int num,
return NULL;
memset(queue, 0, vring_size(num, vring_align));
vring_init(&vring, num, queue, vring_align);
if (virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
bbs = calloc(num, sizeof(*bbs));
if (!bbs)
goto err_free_queue;
}
vring_init(&vring, num, queue, vring_align, bbs);
vq = __vring_new_virtqueue(index, vring, udev);
if (!vq) {
virtio_free_pages(vdev, queue, DIV_ROUND_UP(vring.size, PAGE_SIZE));
return NULL;
}
if (!vq)
goto err_free_bbs;
debug("(%s): created vring @ %p for vq @ %p with num %u\n", udev->name,
queue, vq, num);
return vq;
err_free_bbs:
free(bbs);
err_free_queue:
virtio_free_pages(vdev, queue, DIV_ROUND_UP(vring.size, PAGE_SIZE));
return NULL;
}
void vring_del_virtqueue(struct virtqueue *vq)
@ -339,6 +353,7 @@ void vring_del_virtqueue(struct virtqueue *vq)
DIV_ROUND_UP(vq->vring.size, PAGE_SIZE));
free(vq->vring_desc_shadow);
list_del(&vq->list);
free(vq->vring.bouncebufs);
free(vq);
}

5
include/virtio_ring.h
View file

@ -87,6 +87,7 @@ struct vring_used {
struct vring {
unsigned int num;
size_t size;
struct bounce_buffer *bouncebufs;
struct vring_desc *desc;
struct vring_avail *avail;
struct vring_used *used;
@ -146,10 +147,12 @@ static inline unsigned int vring_size(unsigned int num, unsigned long align)
}
static inline void vring_init(struct vring *vr, unsigned int num, void *p,
unsigned long align)
unsigned long align,
struct bounce_buffer *bouncebufs)
{
vr->num = num;
vr->size = vring_size(num, align);
vr->bouncebufs = bouncebufs;
vr->desc = p;
vr->avail = p + num * sizeof(struct vring_desc);
vr->used = (void *)(((uintptr_t)&vr->avail->ring[num] +