mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 11:49:32 +00:00
![Eli Cohen](/assets/img/avatar_default.png)
Add netlink support to configure the max virtqueue pairs for a device. At least one pair is required. The maximum is dictated by the device. Example: $ vdpa dev add name vdpa-a mgmtdev auxiliary/mlx5_core.sf.1 max_vqp 4 Signed-off-by: Eli Cohen <elic@nvidia.com> Link: https://lore.kernel.org/r/20220105114646.577224-6-elic@nvidia.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
414 lines
9.8 KiB
C
414 lines
9.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* VIRTIO based driver for vDPA device
|
|
*
|
|
* Copyright (c) 2020, Red Hat. All rights reserved.
|
|
* Author: Jason Wang <jasowang@redhat.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uuid.h>
|
|
#include <linux/virtio.h>
|
|
#include <linux/vdpa.h>
|
|
#include <linux/virtio_config.h>
|
|
#include <linux/virtio_ring.h>
|
|
|
|
#define MOD_VERSION "0.1"
|
|
#define MOD_AUTHOR "Jason Wang <jasowang@redhat.com>"
|
|
#define MOD_DESC "vDPA bus driver for virtio devices"
|
|
#define MOD_LICENSE "GPL v2"
|
|
|
|
struct virtio_vdpa_device {
|
|
struct virtio_device vdev;
|
|
struct vdpa_device *vdpa;
|
|
u64 features;
|
|
|
|
/* The lock to protect virtqueue list */
|
|
spinlock_t lock;
|
|
/* List of virtio_vdpa_vq_info */
|
|
struct list_head virtqueues;
|
|
};
|
|
|
|
struct virtio_vdpa_vq_info {
|
|
/* the actual virtqueue */
|
|
struct virtqueue *vq;
|
|
|
|
/* the list node for the virtqueues list */
|
|
struct list_head node;
|
|
};
|
|
|
|
static inline struct virtio_vdpa_device *
|
|
to_virtio_vdpa_device(struct virtio_device *dev)
|
|
{
|
|
return container_of(dev, struct virtio_vdpa_device, vdev);
|
|
}
|
|
|
|
static struct vdpa_device *vd_get_vdpa(struct virtio_device *vdev)
|
|
{
|
|
return to_virtio_vdpa_device(vdev)->vdpa;
|
|
}
|
|
|
|
static void virtio_vdpa_get(struct virtio_device *vdev, unsigned offset,
|
|
void *buf, unsigned len)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
|
|
vdpa_get_config(vdpa, offset, buf, len);
|
|
}
|
|
|
|
static void virtio_vdpa_set(struct virtio_device *vdev, unsigned offset,
|
|
const void *buf, unsigned len)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
|
|
vdpa_set_config(vdpa, offset, buf, len);
|
|
}
|
|
|
|
static u32 virtio_vdpa_generation(struct virtio_device *vdev)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
|
|
if (ops->get_generation)
|
|
return ops->get_generation(vdpa);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u8 virtio_vdpa_get_status(struct virtio_device *vdev)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
|
|
return ops->get_status(vdpa);
|
|
}
|
|
|
|
static void virtio_vdpa_set_status(struct virtio_device *vdev, u8 status)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
|
|
return vdpa_set_status(vdpa, status);
|
|
}
|
|
|
|
static void virtio_vdpa_reset(struct virtio_device *vdev)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
|
|
vdpa_reset(vdpa);
|
|
}
|
|
|
|
static bool virtio_vdpa_notify(struct virtqueue *vq)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vq->vdev);
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
|
|
ops->kick_vq(vdpa, vq->index);
|
|
|
|
return true;
|
|
}
|
|
|
|
static irqreturn_t virtio_vdpa_config_cb(void *private)
|
|
{
|
|
struct virtio_vdpa_device *vd_dev = private;
|
|
|
|
virtio_config_changed(&vd_dev->vdev);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t virtio_vdpa_virtqueue_cb(void *private)
|
|
{
|
|
struct virtio_vdpa_vq_info *info = private;
|
|
|
|
return vring_interrupt(0, info->vq);
|
|
}
|
|
|
|
static struct virtqueue *
|
|
virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
|
|
void (*callback)(struct virtqueue *vq),
|
|
const char *name, bool ctx)
|
|
{
|
|
struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
struct virtio_vdpa_vq_info *info;
|
|
struct vdpa_callback cb;
|
|
struct virtqueue *vq;
|
|
u64 desc_addr, driver_addr, device_addr;
|
|
/* Assume split virtqueue, switch to packed if necessary */
|
|
struct vdpa_vq_state state = {0};
|
|
unsigned long flags;
|
|
u32 align, max_num, min_num = 1;
|
|
bool may_reduce_num = true;
|
|
int err;
|
|
|
|
if (!name)
|
|
return NULL;
|
|
|
|
if (index >= vdpa->nvqs)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
/* Queue shouldn't already be set up. */
|
|
if (ops->get_vq_ready(vdpa, index))
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
/* Allocate and fill out our active queue description */
|
|
info = kmalloc(sizeof(*info), GFP_KERNEL);
|
|
if (!info)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
max_num = ops->get_vq_num_max(vdpa);
|
|
if (max_num == 0) {
|
|
err = -ENOENT;
|
|
goto error_new_virtqueue;
|
|
}
|
|
|
|
if (ops->get_vq_num_min)
|
|
min_num = ops->get_vq_num_min(vdpa);
|
|
|
|
may_reduce_num = (max_num == min_num) ? false : true;
|
|
|
|
/* Create the vring */
|
|
align = ops->get_vq_align(vdpa);
|
|
vq = vring_create_virtqueue(index, max_num, align, vdev,
|
|
true, may_reduce_num, ctx,
|
|
virtio_vdpa_notify, callback, name);
|
|
if (!vq) {
|
|
err = -ENOMEM;
|
|
goto error_new_virtqueue;
|
|
}
|
|
|
|
/* Setup virtqueue callback */
|
|
cb.callback = virtio_vdpa_virtqueue_cb;
|
|
cb.private = info;
|
|
ops->set_vq_cb(vdpa, index, &cb);
|
|
ops->set_vq_num(vdpa, index, virtqueue_get_vring_size(vq));
|
|
|
|
desc_addr = virtqueue_get_desc_addr(vq);
|
|
driver_addr = virtqueue_get_avail_addr(vq);
|
|
device_addr = virtqueue_get_used_addr(vq);
|
|
|
|
if (ops->set_vq_address(vdpa, index,
|
|
desc_addr, driver_addr,
|
|
device_addr)) {
|
|
err = -EINVAL;
|
|
goto err_vq;
|
|
}
|
|
|
|
/* reset virtqueue state index */
|
|
if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
|
|
struct vdpa_vq_state_packed *s = &state.packed;
|
|
|
|
s->last_avail_counter = 1;
|
|
s->last_avail_idx = 0;
|
|
s->last_used_counter = 1;
|
|
s->last_used_idx = 0;
|
|
}
|
|
err = ops->set_vq_state(vdpa, index, &state);
|
|
if (err)
|
|
goto err_vq;
|
|
|
|
ops->set_vq_ready(vdpa, index, 1);
|
|
|
|
vq->priv = info;
|
|
info->vq = vq;
|
|
|
|
spin_lock_irqsave(&vd_dev->lock, flags);
|
|
list_add(&info->node, &vd_dev->virtqueues);
|
|
spin_unlock_irqrestore(&vd_dev->lock, flags);
|
|
|
|
return vq;
|
|
|
|
err_vq:
|
|
vring_del_virtqueue(vq);
|
|
error_new_virtqueue:
|
|
ops->set_vq_ready(vdpa, index, 0);
|
|
/* VDPA driver should make sure vq is stopeed here */
|
|
WARN_ON(ops->get_vq_ready(vdpa, index));
|
|
kfree(info);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void virtio_vdpa_del_vq(struct virtqueue *vq)
|
|
{
|
|
struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vq->vdev);
|
|
struct vdpa_device *vdpa = vd_dev->vdpa;
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
struct virtio_vdpa_vq_info *info = vq->priv;
|
|
unsigned int index = vq->index;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&vd_dev->lock, flags);
|
|
list_del(&info->node);
|
|
spin_unlock_irqrestore(&vd_dev->lock, flags);
|
|
|
|
/* Select and deactivate the queue (best effort) */
|
|
ops->set_vq_ready(vdpa, index, 0);
|
|
|
|
vring_del_virtqueue(vq);
|
|
|
|
kfree(info);
|
|
}
|
|
|
|
static void virtio_vdpa_del_vqs(struct virtio_device *vdev)
|
|
{
|
|
struct virtqueue *vq, *n;
|
|
|
|
list_for_each_entry_safe(vq, n, &vdev->vqs, list)
|
|
virtio_vdpa_del_vq(vq);
|
|
}
|
|
|
|
static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned nvqs,
|
|
struct virtqueue *vqs[],
|
|
vq_callback_t *callbacks[],
|
|
const char * const names[],
|
|
const bool *ctx,
|
|
struct irq_affinity *desc)
|
|
{
|
|
struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
struct vdpa_callback cb;
|
|
int i, err, queue_idx = 0;
|
|
|
|
for (i = 0; i < nvqs; ++i) {
|
|
if (!names[i]) {
|
|
vqs[i] = NULL;
|
|
continue;
|
|
}
|
|
|
|
vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++,
|
|
callbacks[i], names[i], ctx ?
|
|
ctx[i] : false);
|
|
if (IS_ERR(vqs[i])) {
|
|
err = PTR_ERR(vqs[i]);
|
|
goto err_setup_vq;
|
|
}
|
|
}
|
|
|
|
cb.callback = virtio_vdpa_config_cb;
|
|
cb.private = vd_dev;
|
|
ops->set_config_cb(vdpa, &cb);
|
|
|
|
return 0;
|
|
|
|
err_setup_vq:
|
|
virtio_vdpa_del_vqs(vdev);
|
|
return err;
|
|
}
|
|
|
|
static u64 virtio_vdpa_get_features(struct virtio_device *vdev)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
|
|
return ops->get_device_features(vdpa);
|
|
}
|
|
|
|
static int virtio_vdpa_finalize_features(struct virtio_device *vdev)
|
|
{
|
|
struct vdpa_device *vdpa = vd_get_vdpa(vdev);
|
|
|
|
/* Give virtio_ring a chance to accept features. */
|
|
vring_transport_features(vdev);
|
|
|
|
return vdpa_set_features(vdpa, vdev->features, false);
|
|
}
|
|
|
|
static const char *virtio_vdpa_bus_name(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
|
|
struct vdpa_device *vdpa = vd_dev->vdpa;
|
|
|
|
return dev_name(&vdpa->dev);
|
|
}
|
|
|
|
static const struct virtio_config_ops virtio_vdpa_config_ops = {
|
|
.get = virtio_vdpa_get,
|
|
.set = virtio_vdpa_set,
|
|
.generation = virtio_vdpa_generation,
|
|
.get_status = virtio_vdpa_get_status,
|
|
.set_status = virtio_vdpa_set_status,
|
|
.reset = virtio_vdpa_reset,
|
|
.find_vqs = virtio_vdpa_find_vqs,
|
|
.del_vqs = virtio_vdpa_del_vqs,
|
|
.get_features = virtio_vdpa_get_features,
|
|
.finalize_features = virtio_vdpa_finalize_features,
|
|
.bus_name = virtio_vdpa_bus_name,
|
|
};
|
|
|
|
static void virtio_vdpa_release_dev(struct device *_d)
|
|
{
|
|
struct virtio_device *vdev =
|
|
container_of(_d, struct virtio_device, dev);
|
|
struct virtio_vdpa_device *vd_dev =
|
|
container_of(vdev, struct virtio_vdpa_device, vdev);
|
|
|
|
kfree(vd_dev);
|
|
}
|
|
|
|
static int virtio_vdpa_probe(struct vdpa_device *vdpa)
|
|
{
|
|
const struct vdpa_config_ops *ops = vdpa->config;
|
|
struct virtio_vdpa_device *vd_dev, *reg_dev = NULL;
|
|
int ret = -EINVAL;
|
|
|
|
vd_dev = kzalloc(sizeof(*vd_dev), GFP_KERNEL);
|
|
if (!vd_dev)
|
|
return -ENOMEM;
|
|
|
|
vd_dev->vdev.dev.parent = vdpa_get_dma_dev(vdpa);
|
|
vd_dev->vdev.dev.release = virtio_vdpa_release_dev;
|
|
vd_dev->vdev.config = &virtio_vdpa_config_ops;
|
|
vd_dev->vdpa = vdpa;
|
|
INIT_LIST_HEAD(&vd_dev->virtqueues);
|
|
spin_lock_init(&vd_dev->lock);
|
|
|
|
vd_dev->vdev.id.device = ops->get_device_id(vdpa);
|
|
if (vd_dev->vdev.id.device == 0)
|
|
goto err;
|
|
|
|
vd_dev->vdev.id.vendor = ops->get_vendor_id(vdpa);
|
|
ret = register_virtio_device(&vd_dev->vdev);
|
|
reg_dev = vd_dev;
|
|
if (ret)
|
|
goto err;
|
|
|
|
vdpa_set_drvdata(vdpa, vd_dev);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
if (reg_dev)
|
|
put_device(&vd_dev->vdev.dev);
|
|
else
|
|
kfree(vd_dev);
|
|
return ret;
|
|
}
|
|
|
|
static void virtio_vdpa_remove(struct vdpa_device *vdpa)
|
|
{
|
|
struct virtio_vdpa_device *vd_dev = vdpa_get_drvdata(vdpa);
|
|
|
|
unregister_virtio_device(&vd_dev->vdev);
|
|
}
|
|
|
|
static struct vdpa_driver virtio_vdpa_driver = {
|
|
.driver = {
|
|
.name = "virtio_vdpa",
|
|
},
|
|
.probe = virtio_vdpa_probe,
|
|
.remove = virtio_vdpa_remove,
|
|
};
|
|
|
|
module_vdpa_driver(virtio_vdpa_driver);
|
|
|
|
MODULE_VERSION(MOD_VERSION);
|
|
MODULE_LICENSE(MOD_LICENSE);
|
|
MODULE_AUTHOR(MOD_AUTHOR);
|
|
MODULE_DESCRIPTION(MOD_DESC);
|