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virtio: Allocate virtqueue in page-size units

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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: b4bb5227d4
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Will Deacon
2023-03-29 22:24:57 +08:00
committed by Tom Rini
parent da4e8bb09d
commit 75582fc2e6
2 changed files with 32 additions and 14 deletions
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24
drivers/virtio/virtio_ring.c
View File

@@ -15,6 +15,17 @@
#include <virtio_ring.h>
#include <linux/bug.h>
#include <linux/compat.h>
#include <linux/kernel.h>
static void *virtio_alloc_pages(struct udevice *vdev, u32 npages)
{
return memalign(PAGE_SIZE, npages * PAGE_SIZE);
}
static void virtio_free_pages(struct udevice *vdev, void *ptr, u32 npages)
{
free(ptr);
}
static unsigned int virtqueue_attach_desc(struct virtqueue *vq, unsigned int i,
struct virtio_sg *sg, u16 flags)
@@ -271,6 +282,8 @@ struct virtqueue *vring_create_virtqueue(unsigned int index, unsigned int num,
unsigned int vring_align,
struct udevice *udev)
{
struct virtio_dev_priv *uc_priv = dev_get_uclass_priv(udev);
struct udevice *vdev = uc_priv->vdev;
struct virtqueue *vq;
void *queue = NULL;
struct vring vring;
@@ -283,7 +296,9 @@ struct virtqueue *vring_create_virtqueue(unsigned int index, unsigned int num,
/* TODO: allocate each queue chunk individually */
for (; num && vring_size(num, vring_align) > PAGE_SIZE; num /= 2) {
queue = memalign(PAGE_SIZE, vring_size(num, vring_align));
size_t sz = vring_size(num, vring_align);
queue = virtio_alloc_pages(vdev, DIV_ROUND_UP(sz, PAGE_SIZE));
if (queue)
break;
}
@@ -293,7 +308,7 @@ struct virtqueue *vring_create_virtqueue(unsigned int index, unsigned int num,
if (!queue) {
/* Try to get a single page. You are my only hope! */
queue = memalign(PAGE_SIZE, vring_size(num, vring_align));
queue = virtio_alloc_pages(vdev, 1);
}
if (!queue)
return NULL;
@@ -303,7 +318,7 @@ struct virtqueue *vring_create_virtqueue(unsigned int index, unsigned int num,
vq = __vring_new_virtqueue(index, vring, udev);
if (!vq) {
free(queue);
virtio_free_pages(vdev, queue, DIV_ROUND_UP(vring.size, PAGE_SIZE));
return NULL;
}
debug("(%s): created vring @ %p for vq @ %p with num %u\n", udev->name,
@@ -314,7 +329,8 @@ struct virtqueue *vring_create_virtqueue(unsigned int index, unsigned int num,
void vring_del_virtqueue(struct virtqueue *vq)
{
free(vq->vring.desc);
virtio_free_pages(vq->vdev, vq->vring.desc,
DIV_ROUND_UP(vq->vring.size, PAGE_SIZE));
free(vq->vring_desc_shadow);
list_del(&vq->list);
free(vq);