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virtio_pci: support the arg sizes of find_vqs()
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Virtio PCI supports new parameter sizes of find_vqs().

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-35-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Xuan Zhuo authored and Michael S. Tsirkin committed Aug 11, 2022
1 parent a10fba0 commit cdb4480
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Showing 4 changed files with 23 additions and 12 deletions.
18 changes: 10 additions & 8 deletions drivers/virtio/virtio_pci_common.c
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Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int index,
void (*callback)(struct virtqueue *vq),
const char *name,
u32 size,
bool ctx,
u16 msix_vec)
{
Expand All @@ -186,7 +187,7 @@ static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned int in
if (!info)
return ERR_PTR(-ENOMEM);

vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,
vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, size, ctx,
msix_vec);
if (IS_ERR(vq))
goto out_info;
Expand Down Expand Up @@ -283,7 +284,7 @@ void vp_del_vqs(struct virtio_device *vdev)

static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], bool per_vq_vectors,
const char * const names[], u32 sizes[], bool per_vq_vectors,
const bool *ctx,
struct irq_affinity *desc)
{
Expand Down Expand Up @@ -326,8 +327,8 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,
else
msix_vec = VP_MSIX_VQ_VECTOR;
vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
ctx ? ctx[i] : false,
msix_vec);
sizes ? sizes[i] : 0,
ctx ? ctx[i] : false, msix_vec);
if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]);
goto error_find;
Expand Down Expand Up @@ -357,7 +358,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned int nvqs,

static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], const bool *ctx)
const char * const names[], u32 sizes[], const bool *ctx)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i, err, queue_idx = 0;
Expand All @@ -379,6 +380,7 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned int nvqs,
continue;
}
vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
sizes ? sizes[i] : 0,
ctx ? ctx[i] : false,
VIRTIO_MSI_NO_VECTOR);
if (IS_ERR(vqs[i])) {
Expand All @@ -402,15 +404,15 @@ int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
int err;

/* Try MSI-X with one vector per queue. */
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc);
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, sizes, true, ctx, desc);
if (!err)
return 0;
/* Fallback: MSI-X with one vector for config, one shared for queues. */
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc);
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, sizes, false, ctx, desc);
if (!err)
return 0;
/* Finally fall back to regular interrupts. */
return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx);
return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, sizes, ctx);
}

const char *vp_bus_name(struct virtio_device *vdev)
Expand Down
1 change: 1 addition & 0 deletions drivers/virtio/virtio_pci_common.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,7 @@ struct virtio_pci_device {
unsigned int idx,
void (*callback)(struct virtqueue *vq),
const char *name,
u32 size,
bool ctx,
u16 msix_vec);
void (*del_vq)(struct virtio_pci_vq_info *info);
Expand Down
6 changes: 5 additions & 1 deletion drivers/virtio/virtio_pci_legacy.c
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
unsigned int index,
void (*callback)(struct virtqueue *vq),
const char *name,
u32 size,
bool ctx,
u16 msix_vec)
{
Expand All @@ -125,10 +126,13 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
if (!num || vp_legacy_get_queue_enable(&vp_dev->ldev, index))
return ERR_PTR(-ENOENT);

if (!size || size > num)
size = num;

info->msix_vector = msix_vec;

/* create the vring */
vq = vring_create_virtqueue(index, num,
vq = vring_create_virtqueue(index, size,
VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
true, false, ctx,
vp_notify, callback, name);
Expand Down
10 changes: 7 additions & 3 deletions drivers/virtio/virtio_pci_modern.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -293,6 +293,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
unsigned int index,
void (*callback)(struct virtqueue *vq),
const char *name,
u32 size,
bool ctx,
u16 msix_vec)
{
Expand All @@ -310,15 +311,18 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
if (!num || vp_modern_get_queue_enable(mdev, index))
return ERR_PTR(-ENOENT);

if (num & (num - 1)) {
dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num);
if (!size || size > num)
size = num;

if (size & (size - 1)) {
dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", size);
return ERR_PTR(-EINVAL);
}

info->msix_vector = msix_vec;

/* create the vring */
vq = vring_create_virtqueue(index, num,
vq = vring_create_virtqueue(index, size,
SMP_CACHE_BYTES, &vp_dev->vdev,
true, true, ctx,
vp_notify, callback, name);
Expand Down

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