// SPDX-License-Identifier: GPL-2.0-only
/*
 * VDPA device simulator core.
 *
 * Copyright (c) 2020, Red Hat Inc. 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/kthread.h>
#include <linux/slab.h>
#include <linux/dma-map-ops.h>
#include <linux/vringh.h>
#include <linux/vdpa.h>
#include <linux/vhost_iotlb.h>
#include <uapi/linux/vdpa.h>
#include <uapi/linux/vhost_types.h>

#include "vdpa_sim.h"

#define DRV_VERSION  "0.1"
#define DRV_AUTHOR   "Jason Wang <jasowang@redhat.com>"
#define DRV_DESC     "vDPA Device Simulator core"
#define DRV_LICENSE  "GPL v2"

static int batch_mapping = 1;
module_param(batch_mapping, int, 0444);
MODULE_PARM_DESC(batch_mapping, "Batched mapping 1 -Enable; 0 - Disable");

static int max_iotlb_entries = 2048;
module_param(max_iotlb_entries, int, 0444);
MODULE_PARM_DESC(max_iotlb_entries,
                 "Maximum number of iotlb entries for each address space. 0 means unlimited. (default: 2048)");

static bool use_va = true;
module_param(use_va, bool, 0444);
MODULE_PARM_DESC(use_va, "Enable/disable the device's ability to use VA");

#define VDPASIM_QUEUE_ALIGN PAGE_SIZE
#define VDPASIM_QUEUE_MAX 256
#define VDPASIM_VENDOR_ID 0

struct vdpasim_mm_work {
        struct kthread_work work;
        struct vdpasim *vdpasim;
        struct mm_struct *mm_to_bind;
        int ret;
};

static void vdpasim_mm_work_fn(struct kthread_work *work)
{
        struct vdpasim_mm_work *mm_work =
                container_of(work, struct vdpasim_mm_work, work);
        struct vdpasim *vdpasim = mm_work->vdpasim;

        mm_work->ret = 0;

        //TODO: should we attach the cgroup of the mm owner?
        vdpasim->mm_bound = mm_work->mm_to_bind;
}

static void vdpasim_worker_change_mm_sync(struct vdpasim *vdpasim,
                                          struct vdpasim_mm_work *mm_work)
{
        struct kthread_work *work = &mm_work->work;

        kthread_init_work(work, vdpasim_mm_work_fn);
        kthread_queue_work(vdpasim->worker, work);

        kthread_flush_work(work);
}

static struct vdpasim *vdpa_to_sim(struct vdpa_device *vdpa)
{
        return container_of(vdpa, struct vdpasim, vdpa);
}

static void vdpasim_vq_notify(struct vringh *vring)
{
        struct vdpasim_virtqueue *vq =
                container_of(vring, struct vdpasim_virtqueue, vring);

        if (!vq->cb)
                return;

        vq->cb(vq->private);
}

static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
{
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
        uint16_t last_avail_idx = vq->vring.last_avail_idx;
        struct vring_desc *desc = (struct vring_desc *)
                                  (uintptr_t)vq->desc_addr;
        struct vring_avail *avail = (struct vring_avail *)
                                    (uintptr_t)vq->driver_addr;
        struct vring_used *used = (struct vring_used *)
                                  (uintptr_t)vq->device_addr;

        if (use_va && vdpasim->mm_bound) {
                vringh_init_iotlb_va(&vq->vring, vdpasim->features, vq->num,
                                     true, desc, avail, used);
        } else {
                vringh_init_iotlb(&vq->vring, vdpasim->features, vq->num,
                                  true, desc, avail, used);
        }

        vq->vring.last_avail_idx = last_avail_idx;

        /*
         * Since vdpa_sim does not support receive inflight descriptors as a
         * destination of a migration, let's set both avail_idx and used_idx
         * the same at vq start.  This is how vhost-user works in a
         * VHOST_SET_VRING_BASE call.
         *
         * Although the simple fix is to set last_used_idx at
         * vdpasim_set_vq_state, it would be reset at vdpasim_queue_ready.
         */
        vq->vring.last_used_idx = last_avail_idx;
        vq->vring.notify = vdpasim_vq_notify;
}

static void vdpasim_vq_reset(struct vdpasim *vdpasim,
                             struct vdpasim_virtqueue *vq)
{
        vq->ready = false;
        vq->desc_addr = 0;
        vq->driver_addr = 0;
        vq->device_addr = 0;
        vq->cb = NULL;
        vq->private = NULL;
        vringh_init_iotlb(&vq->vring, vdpasim->dev_attr.supported_features,
                          VDPASIM_QUEUE_MAX, false, NULL, NULL, NULL);

        vq->vring.notify = NULL;
}

static void vdpasim_do_reset(struct vdpasim *vdpasim, u32 flags)
{
        int i;

        spin_lock(&vdpasim->iommu_lock);

        for (i = 0; i < vdpasim->dev_attr.nvqs; i++) {
                vdpasim_vq_reset(vdpasim, &vdpasim->vqs[i]);
                vringh_set_iotlb(&vdpasim->vqs[i].vring, &vdpasim->iommu[0],
                                 &vdpasim->iommu_lock);
        }

        if (flags & VDPA_RESET_F_CLEAN_MAP) {
                for (i = 0; i < vdpasim->dev_attr.nas; i++) {
                        vhost_iotlb_reset(&vdpasim->iommu[i]);
                        vhost_iotlb_add_range(&vdpasim->iommu[i], 0, ULONG_MAX,
                                              0, VHOST_MAP_RW);
                        vdpasim->iommu_pt[i] = true;
                }
        }

        vdpasim->running = false;
        spin_unlock(&vdpasim->iommu_lock);

        vdpasim->features = 0;
        vdpasim->status = 0;
        ++vdpasim->generation;
}

static const struct vdpa_config_ops vdpasim_config_ops;
static const struct vdpa_config_ops vdpasim_batch_config_ops;

static void vdpasim_work_fn(struct kthread_work *work)
{
        struct vdpasim *vdpasim = container_of(work, struct vdpasim, work);
        struct mm_struct *mm = vdpasim->mm_bound;

        if (use_va && mm) {
                if (!mmget_not_zero(mm))
                        return;
                kthread_use_mm(mm);
        }

        vdpasim->dev_attr.work_fn(vdpasim);

        if (use_va && mm) {
                kthread_unuse_mm(mm);
                mmput(mm);
        }
}

struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
                               const struct vdpa_dev_set_config *config)
{
        const struct vdpa_config_ops *ops;
        struct vdpa_device *vdpa;
        struct vdpasim *vdpasim;
        struct device *dev;
        int i, ret = -ENOMEM;

        if (!dev_attr->alloc_size)
                return ERR_PTR(-EINVAL);

        if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
                if (config->device_features &
                    ~dev_attr->supported_features)
                        return ERR_PTR(-EINVAL);
                dev_attr->supported_features =
                        config->device_features;
        }

        if (batch_mapping)
                ops = &vdpasim_batch_config_ops;
        else
                ops = &vdpasim_config_ops;

        vdpa = __vdpa_alloc_device(NULL, ops, NULL,
                                   dev_attr->ngroups, dev_attr->nas,
                                   dev_attr->alloc_size,
                                   dev_attr->name, use_va);
        if (IS_ERR(vdpa)) {
                ret = PTR_ERR(vdpa);
                goto err_alloc;
        }

        vdpasim = vdpa_to_sim(vdpa);
        vdpasim->dev_attr = *dev_attr;
        dev = &vdpasim->vdpa.dev;

        kthread_init_work(&vdpasim->work, vdpasim_work_fn);
        vdpasim->worker = kthread_run_worker(0, "vDPA sim worker: %s",
                                                dev_attr->name);
        if (IS_ERR(vdpasim->worker))
                goto err_iommu;

        mutex_init(&vdpasim->mutex);
        spin_lock_init(&vdpasim->iommu_lock);

        dev->dma_mask = &dev->coherent_dma_mask;
        if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64)))
                goto err_iommu;
        vdpasim->vdpa.mdev = dev_attr->mgmt_dev;

        vdpasim->config = kzalloc(dev_attr->config_size, GFP_KERNEL);
        if (!vdpasim->config)
                goto err_iommu;

        vdpasim->vqs = kzalloc_objs(struct vdpasim_virtqueue, dev_attr->nvqs);
        if (!vdpasim->vqs)
                goto err_iommu;

        vdpasim->iommu = kmalloc_objs(*vdpasim->iommu, vdpasim->dev_attr.nas);
        if (!vdpasim->iommu)
                goto err_iommu;

        vdpasim->iommu_pt = kmalloc_objs(*vdpasim->iommu_pt,
                                         vdpasim->dev_attr.nas);
        if (!vdpasim->iommu_pt)
                goto err_iommu;

        for (i = 0; i < vdpasim->dev_attr.nas; i++) {
                vhost_iotlb_init(&vdpasim->iommu[i], max_iotlb_entries, 0);
                vhost_iotlb_add_range(&vdpasim->iommu[i], 0, ULONG_MAX, 0,
                                      VHOST_MAP_RW);
                vdpasim->iommu_pt[i] = true;
        }

        for (i = 0; i < dev_attr->nvqs; i++)
                vringh_set_iotlb(&vdpasim->vqs[i].vring, &vdpasim->iommu[0],
                                 &vdpasim->iommu_lock);

        vdpasim->vdpa.vmap.dma_dev = dev;

        return vdpasim;

err_iommu:
        put_device(dev);
err_alloc:
        return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(vdpasim_create);

void vdpasim_schedule_work(struct vdpasim *vdpasim)
{
        kthread_queue_work(vdpasim->worker, &vdpasim->work);
}
EXPORT_SYMBOL_GPL(vdpasim_schedule_work);

static int vdpasim_set_vq_address(struct vdpa_device *vdpa, u16 idx,
                                  u64 desc_area, u64 driver_area,
                                  u64 device_area)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];

        vq->desc_addr = desc_area;
        vq->driver_addr = driver_area;
        vq->device_addr = device_area;

        return 0;
}

static void vdpasim_set_vq_num(struct vdpa_device *vdpa, u16 idx, u32 num)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];

        vq->num = num;
}

static u16 vdpasim_get_vq_size(struct vdpa_device *vdpa, u16 idx)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];

        if (vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK)
                return vq->num;
        else
                return VDPASIM_QUEUE_MAX;
}

static void vdpasim_kick_vq(struct vdpa_device *vdpa, u16 idx)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];

        if (!vdpasim->running &&
            (vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
                vdpasim->pending_kick = true;
                return;
        }

        if (vq->ready)
                vdpasim_schedule_work(vdpasim);
}

static void vdpasim_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
                              struct vdpa_callback *cb)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];

        vq->cb = cb->callback;
        vq->private = cb->private;
}

static void vdpasim_set_vq_ready(struct vdpa_device *vdpa, u16 idx, bool ready)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
        bool old_ready;

        mutex_lock(&vdpasim->mutex);
        old_ready = vq->ready;
        vq->ready = ready;
        if (vq->ready && !old_ready) {
                vdpasim_queue_ready(vdpasim, idx);
        }
        mutex_unlock(&vdpasim->mutex);
}

static bool vdpasim_get_vq_ready(struct vdpa_device *vdpa, u16 idx)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];

        return vq->ready;
}

static int vdpasim_set_vq_state(struct vdpa_device *vdpa, u16 idx,
                                const struct vdpa_vq_state *state)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
        struct vringh *vrh = &vq->vring;

        mutex_lock(&vdpasim->mutex);
        vrh->last_avail_idx = state->split.avail_index;
        mutex_unlock(&vdpasim->mutex);

        return 0;
}

static int vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx,
                                struct vdpa_vq_state *state)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
        struct vringh *vrh = &vq->vring;

        state->split.avail_index = vrh->last_avail_idx;
        return 0;
}

static int vdpasim_get_vq_stats(struct vdpa_device *vdpa, u16 idx,
                                struct sk_buff *msg,
                                struct netlink_ext_ack *extack)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        if (vdpasim->dev_attr.get_stats)
                return vdpasim->dev_attr.get_stats(vdpasim, idx,
                                                   msg, extack);
        return -EOPNOTSUPP;
}

static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
{
        return VDPASIM_QUEUE_ALIGN;
}

static u32 vdpasim_get_vq_group(struct vdpa_device *vdpa, u16 idx)
{
        /* RX and TX belongs to group 0, CVQ belongs to group 1 */
        if (idx == 2)
                return 1;
        else
                return 0;
}

static u64 vdpasim_get_device_features(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        return vdpasim->dev_attr.supported_features;
}

static u64 vdpasim_get_backend_features(const struct vdpa_device *vdpa)
{
        return BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK);
}

static int vdpasim_set_driver_features(struct vdpa_device *vdpa, u64 features)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        /* DMA mapping must be done by driver */
        if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
                return -EINVAL;

        vdpasim->features = features & vdpasim->dev_attr.supported_features;

        return 0;
}

static u64 vdpasim_get_driver_features(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        return vdpasim->features;
}

static void vdpasim_set_config_cb(struct vdpa_device *vdpa,
                                  struct vdpa_callback *cb)
{
        /* We don't support config interrupt */
}

static u16 vdpasim_get_vq_num_max(struct vdpa_device *vdpa)
{
        return VDPASIM_QUEUE_MAX;
}

static u32 vdpasim_get_device_id(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        return vdpasim->dev_attr.id;
}

static u32 vdpasim_get_vendor_id(struct vdpa_device *vdpa)
{
        return VDPASIM_VENDOR_ID;
}

static u8 vdpasim_get_status(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        u8 status;

        mutex_lock(&vdpasim->mutex);
        status = vdpasim->status;
        mutex_unlock(&vdpasim->mutex);

        return status;
}

static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        mutex_lock(&vdpasim->mutex);
        vdpasim->status = status;
        vdpasim->running = (status & VIRTIO_CONFIG_S_DRIVER_OK) != 0;
        mutex_unlock(&vdpasim->mutex);
}

static int vdpasim_compat_reset(struct vdpa_device *vdpa, u32 flags)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        mutex_lock(&vdpasim->mutex);
        vdpasim->status = 0;
        vdpasim_do_reset(vdpasim, flags);
        mutex_unlock(&vdpasim->mutex);

        return 0;
}

static int vdpasim_reset(struct vdpa_device *vdpa)
{
        return vdpasim_compat_reset(vdpa, 0);
}

static int vdpasim_suspend(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        mutex_lock(&vdpasim->mutex);
        vdpasim->running = false;
        mutex_unlock(&vdpasim->mutex);

        return 0;
}

static int vdpasim_resume(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        int i;

        mutex_lock(&vdpasim->mutex);
        vdpasim->running = true;

        if (vdpasim->pending_kick) {
                /* Process pending descriptors */
                for (i = 0; i < vdpasim->dev_attr.nvqs; ++i)
                        vdpasim_kick_vq(vdpa, i);

                vdpasim->pending_kick = false;
        }

        mutex_unlock(&vdpasim->mutex);

        return 0;
}

static size_t vdpasim_get_config_size(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        return vdpasim->dev_attr.config_size;
}

static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
                             void *buf, unsigned int len)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        if (offset + len > vdpasim->dev_attr.config_size)
                return;

        if (vdpasim->dev_attr.get_config)
                vdpasim->dev_attr.get_config(vdpasim, vdpasim->config);

        memcpy(buf, vdpasim->config + offset, len);
}

static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,
                             const void *buf, unsigned int len)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        if (offset + len > vdpasim->dev_attr.config_size)
                return;

        memcpy(vdpasim->config + offset, buf, len);

        if (vdpasim->dev_attr.set_config)
                vdpasim->dev_attr.set_config(vdpasim, vdpasim->config);
}

static u32 vdpasim_get_generation(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        return vdpasim->generation;
}

static struct vdpa_iova_range vdpasim_get_iova_range(struct vdpa_device *vdpa)
{
        struct vdpa_iova_range range = {
                .first = 0ULL,
                .last = ULLONG_MAX,
        };

        return range;
}

static int vdpasim_set_group_asid(struct vdpa_device *vdpa, unsigned int group,
                                  unsigned int asid)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vhost_iotlb *iommu;
        int i;

        iommu = &vdpasim->iommu[asid];

        mutex_lock(&vdpasim->mutex);

        for (i = 0; i < vdpasim->dev_attr.nvqs; i++)
                if (vdpasim_get_vq_group(vdpa, i) == group)
                        vringh_set_iotlb(&vdpasim->vqs[i].vring, iommu,
                                         &vdpasim->iommu_lock);

        mutex_unlock(&vdpasim->mutex);

        return 0;
}

static int vdpasim_set_map(struct vdpa_device *vdpa, unsigned int asid,
                           struct vhost_iotlb *iotlb)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vhost_iotlb_map *map;
        struct vhost_iotlb *iommu;
        u64 start = 0ULL, last = 0ULL - 1;
        int ret;

        if (asid >= vdpasim->dev_attr.nas)
                return -EINVAL;

        spin_lock(&vdpasim->iommu_lock);

        iommu = &vdpasim->iommu[asid];
        vhost_iotlb_reset(iommu);
        vdpasim->iommu_pt[asid] = false;

        for (map = vhost_iotlb_itree_first(iotlb, start, last); map;
             map = vhost_iotlb_itree_next(map, start, last)) {
                ret = vhost_iotlb_add_range(iommu, map->start,
                                            map->last, map->addr, map->perm);
                if (ret)
                        goto err;
        }
        spin_unlock(&vdpasim->iommu_lock);
        return 0;

err:
        vhost_iotlb_reset(iommu);
        spin_unlock(&vdpasim->iommu_lock);
        return ret;
}

static int vdpasim_reset_map(struct vdpa_device *vdpa, unsigned int asid)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        if (asid >= vdpasim->dev_attr.nas)
                return -EINVAL;

        spin_lock(&vdpasim->iommu_lock);
        if (vdpasim->iommu_pt[asid])
                goto out;
        vhost_iotlb_reset(&vdpasim->iommu[asid]);
        vhost_iotlb_add_range(&vdpasim->iommu[asid], 0, ULONG_MAX,
                              0, VHOST_MAP_RW);
        vdpasim->iommu_pt[asid] = true;
out:
        spin_unlock(&vdpasim->iommu_lock);
        return 0;
}

static int vdpasim_bind_mm(struct vdpa_device *vdpa, struct mm_struct *mm)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_mm_work mm_work;

        mm_work.vdpasim = vdpasim;
        mm_work.mm_to_bind = mm;

        vdpasim_worker_change_mm_sync(vdpasim, &mm_work);

        return mm_work.ret;
}

static void vdpasim_unbind_mm(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        struct vdpasim_mm_work mm_work;

        mm_work.vdpasim = vdpasim;
        mm_work.mm_to_bind = NULL;

        vdpasim_worker_change_mm_sync(vdpasim, &mm_work);
}

static int vdpasim_dma_map(struct vdpa_device *vdpa, unsigned int asid,
                           u64 iova, u64 size,
                           u64 pa, u32 perm, void *opaque)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        int ret;

        if (asid >= vdpasim->dev_attr.nas)
                return -EINVAL;

        spin_lock(&vdpasim->iommu_lock);
        if (vdpasim->iommu_pt[asid]) {
                vhost_iotlb_reset(&vdpasim->iommu[asid]);
                vdpasim->iommu_pt[asid] = false;
        }
        ret = vhost_iotlb_add_range_ctx(&vdpasim->iommu[asid], iova,
                                        iova + size - 1, pa, perm, opaque);
        spin_unlock(&vdpasim->iommu_lock);

        return ret;
}

static int vdpasim_dma_unmap(struct vdpa_device *vdpa, unsigned int asid,
                             u64 iova, u64 size)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);

        if (asid >= vdpasim->dev_attr.nas)
                return -EINVAL;

        if (vdpasim->iommu_pt[asid]) {
                vhost_iotlb_reset(&vdpasim->iommu[asid]);
                vdpasim->iommu_pt[asid] = false;
        }

        spin_lock(&vdpasim->iommu_lock);
        vhost_iotlb_del_range(&vdpasim->iommu[asid], iova, iova + size - 1);
        spin_unlock(&vdpasim->iommu_lock);

        return 0;
}

static void vdpasim_free(struct vdpa_device *vdpa)
{
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
        int i;

        kthread_cancel_work_sync(&vdpasim->work);
        kthread_destroy_worker(vdpasim->worker);

        for (i = 0; i < vdpasim->dev_attr.nvqs; i++) {
                vringh_kiov_cleanup(&vdpasim->vqs[i].out_iov);
                vringh_kiov_cleanup(&vdpasim->vqs[i].in_iov);
        }

        vdpasim->dev_attr.free(vdpasim);

        for (i = 0; i < vdpasim->dev_attr.nas; i++)
                vhost_iotlb_reset(&vdpasim->iommu[i]);
        kfree(vdpasim->iommu);
        kfree(vdpasim->iommu_pt);
        kfree(vdpasim->vqs);
        kfree(vdpasim->config);
}

static const struct vdpa_config_ops vdpasim_config_ops = {
        .set_vq_address         = vdpasim_set_vq_address,
        .set_vq_num             = vdpasim_set_vq_num,
        .kick_vq                = vdpasim_kick_vq,
        .set_vq_cb              = vdpasim_set_vq_cb,
        .set_vq_ready           = vdpasim_set_vq_ready,
        .get_vq_ready           = vdpasim_get_vq_ready,
        .set_vq_state           = vdpasim_set_vq_state,
        .get_vendor_vq_stats    = vdpasim_get_vq_stats,
        .get_vq_state           = vdpasim_get_vq_state,
        .get_vq_align           = vdpasim_get_vq_align,
        .get_vq_group           = vdpasim_get_vq_group,
        .get_device_features    = vdpasim_get_device_features,
        .get_backend_features   = vdpasim_get_backend_features,
        .set_driver_features    = vdpasim_set_driver_features,
        .get_driver_features    = vdpasim_get_driver_features,
        .set_config_cb          = vdpasim_set_config_cb,
        .get_vq_num_max         = vdpasim_get_vq_num_max,
        .get_vq_size            = vdpasim_get_vq_size,
        .get_device_id          = vdpasim_get_device_id,
        .get_vendor_id          = vdpasim_get_vendor_id,
        .get_status             = vdpasim_get_status,
        .set_status             = vdpasim_set_status,
        .reset                  = vdpasim_reset,
        .compat_reset           = vdpasim_compat_reset,
        .suspend                = vdpasim_suspend,
        .resume                 = vdpasim_resume,
        .get_config_size        = vdpasim_get_config_size,
        .get_config             = vdpasim_get_config,
        .set_config             = vdpasim_set_config,
        .get_generation         = vdpasim_get_generation,
        .get_iova_range         = vdpasim_get_iova_range,
        .set_group_asid         = vdpasim_set_group_asid,
        .dma_map                = vdpasim_dma_map,
        .dma_unmap              = vdpasim_dma_unmap,
        .reset_map              = vdpasim_reset_map,
        .bind_mm                = vdpasim_bind_mm,
        .unbind_mm              = vdpasim_unbind_mm,
        .free                   = vdpasim_free,
};

static const struct vdpa_config_ops vdpasim_batch_config_ops = {
        .set_vq_address         = vdpasim_set_vq_address,
        .set_vq_num             = vdpasim_set_vq_num,
        .kick_vq                = vdpasim_kick_vq,
        .set_vq_cb              = vdpasim_set_vq_cb,
        .set_vq_ready           = vdpasim_set_vq_ready,
        .get_vq_ready           = vdpasim_get_vq_ready,
        .set_vq_state           = vdpasim_set_vq_state,
        .get_vendor_vq_stats    = vdpasim_get_vq_stats,
        .get_vq_state           = vdpasim_get_vq_state,
        .get_vq_align           = vdpasim_get_vq_align,
        .get_vq_group           = vdpasim_get_vq_group,
        .get_device_features    = vdpasim_get_device_features,
        .get_backend_features   = vdpasim_get_backend_features,
        .set_driver_features    = vdpasim_set_driver_features,
        .get_driver_features    = vdpasim_get_driver_features,
        .set_config_cb          = vdpasim_set_config_cb,
        .get_vq_num_max         = vdpasim_get_vq_num_max,
        .get_device_id          = vdpasim_get_device_id,
        .get_vendor_id          = vdpasim_get_vendor_id,
        .get_status             = vdpasim_get_status,
        .set_status             = vdpasim_set_status,
        .reset                  = vdpasim_reset,
        .compat_reset           = vdpasim_compat_reset,
        .suspend                = vdpasim_suspend,
        .resume                 = vdpasim_resume,
        .get_config_size        = vdpasim_get_config_size,
        .get_config             = vdpasim_get_config,
        .set_config             = vdpasim_set_config,
        .get_generation         = vdpasim_get_generation,
        .get_iova_range         = vdpasim_get_iova_range,
        .set_group_asid         = vdpasim_set_group_asid,
        .set_map                = vdpasim_set_map,
        .reset_map              = vdpasim_reset_map,
        .bind_mm                = vdpasim_bind_mm,
        .unbind_mm              = vdpasim_unbind_mm,
        .free                   = vdpasim_free,
};

MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE(DRV_LICENSE);
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION(DRV_DESC);