On Mon, Feb 10, 2020 at 11:56:08AM +0800, Jason Wang wrote: > This patch implements a software vDPA networking device. The datapath > is implemented through vringh and workqueue. The device has an on-chip > IOMMU which translates IOVA to PA. For kernel virtio drivers, vDPA > simulator driver provides dma_ops. For vhost driers, set_map() methods > of vdpa_config_ops is implemented to accept mappings from vhost. > > Currently, vDPA device simulator will loopback TX traffic to RX. So > the main use case for the device is vDPA feature testing, prototyping > and development. > > Note, there's no management API implemented, a vDPA device will be > registered once the module is probed. We need to handle this in the > future development. > > Signed-off-by: Jason Wang <[email protected]> > --- > drivers/virtio/vdpa/Kconfig | 17 + > drivers/virtio/vdpa/Makefile | 1 + > drivers/virtio/vdpa/vdpa_sim.c | 678 +++++++++++++++++++++++++++++++++ > 3 files changed, 696 insertions(+) > create mode 100644 drivers/virtio/vdpa/vdpa_sim.c > > diff --git a/drivers/virtio/vdpa/Kconfig b/drivers/virtio/vdpa/Kconfig > index 7a99170e6c30..a7888974dda8 100644 > --- a/drivers/virtio/vdpa/Kconfig > +++ b/drivers/virtio/vdpa/Kconfig > @@ -7,3 +7,20 @@ config VDPA > datapath which complies with virtio specifications with > vendor specific control path. > > +menuconfig VDPA_MENU > + bool "VDPA drivers" > + default n > + > +if VDPA_MENU > + > +config VDPA_SIM > + tristate "vDPA device simulator" > + select VDPA > + default n > + help > + vDPA networking device simulator which loop TX traffic back > + to RX. This device is used for testing, prototyping and > + development of vDPA.
So how about we make this depend on RUNTIME_TESTING_MENU? > + > +endif # VDPA_MENU > + > diff --git a/drivers/virtio/vdpa/Makefile b/drivers/virtio/vdpa/Makefile > index ee6a35e8a4fb..5ec0e6ae3c57 100644 > --- a/drivers/virtio/vdpa/Makefile > +++ b/drivers/virtio/vdpa/Makefile > @@ -1,2 +1,3 @@ > # SPDX-License-Identifier: GPL-2.0 > obj-$(CONFIG_VDPA) += vdpa.o > +obj-$(CONFIG_VDPA_SIM) += vdpa_sim.o > diff --git a/drivers/virtio/vdpa/vdpa_sim.c b/drivers/virtio/vdpa/vdpa_sim.c > new file mode 100644 > index 000000000000..89783a2b9773 > --- /dev/null > +++ b/drivers/virtio/vdpa/vdpa_sim.c > @@ -0,0 +1,678 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * VDPA networking device simulator. > + * > + * Copyright (c) 2020, Red Hat Inc. All rights reserved. > + * Author: Jason Wang <[email protected]> > + * > + */ > + > +#include <linux/init.h> > +#include <linux/module.h> > +#include <linux/device.h> > +#include <linux/kernel.h> > +#include <linux/fs.h> > +#include <linux/poll.h> > +#include <linux/slab.h> > +#include <linux/sched.h> > +#include <linux/wait.h> > +#include <linux/uuid.h> > +#include <linux/iommu.h> > +#include <linux/sysfs.h> > +#include <linux/file.h> > +#include <linux/etherdevice.h> > +#include <linux/vringh.h> > +#include <linux/vdpa.h> > +#include <linux/vhost_iotlb.h> > +#include <uapi/linux/virtio_config.h> > +#include <uapi/linux/virtio_net.h> > + > +#define DRV_VERSION "0.1" > +#define DRV_AUTHOR "Jason Wang <[email protected]>" > +#define DRV_DESC "vDPA Device Simulator" > +#define DRV_LICENSE "GPL v2" > + > +struct vdpasim_dev { > + struct device dev; > +}; > + > +struct vdpasim_dev *vdpasim_dev; > + > +struct vdpasim_virtqueue { > + struct vringh vring; > + struct vringh_kiov iov; > + unsigned short head; > + bool ready; > + u64 desc_addr; > + u64 device_addr; > + u64 driver_addr; > + u32 num; > + void *private; > + irqreturn_t (*cb)(void *data); > +}; > + > +#define VDPASIM_QUEUE_ALIGN PAGE_SIZE > +#define VDPASIM_QUEUE_MAX 256 > +#define VDPASIM_DEVICE_ID 0x1 > +#define VDPASIM_VENDOR_ID 0 > +#define VDPASIM_VQ_NUM 0x2 > +#define VDPASIM_NAME "vdpasim-netdev" > + > +static u64 vdpasim_features = (1ULL << VIRTIO_F_ANY_LAYOUT) | > + (1ULL << VIRTIO_F_VERSION_1) | > + (1ULL << VIRTIO_F_IOMMU_PLATFORM); > + > +/* State of each vdpasim device */ > +struct vdpasim { > + struct vdpasim_virtqueue vqs[2]; > + struct work_struct work; > + /* spinlock to synchronize virtqueue state */ > + spinlock_t lock; > + struct vdpa_device vdpa; > + struct virtio_net_config config; > + struct vhost_iotlb *iommu; > + void *buffer; > + u32 status; > + u32 generation; > + u64 features; > +}; > + > +struct vdpasim *vdpa_sim; > + > +static struct vdpasim *vdpa_to_sim(struct vdpa_device *vdpa) > +{ > + return container_of(vdpa, struct vdpasim, vdpa); > +} > + > +static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx) > +{ > + struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx]; > + int ret; > + > + ret = vringh_init_iotlb(&vq->vring, vdpasim_features, > + VDPASIM_QUEUE_MAX, false, > + (struct vring_desc *)(uintptr_t)vq->desc_addr, > + (struct vring_avail *) > + (uintptr_t)vq->driver_addr, > + (struct vring_used *) > + (uintptr_t)vq->device_addr); > +} > + > +static void vdpasim_vq_reset(struct vdpasim_virtqueue *vq) > +{ > + vq->ready = 0; > + vq->desc_addr = 0; > + vq->driver_addr = 0; > + vq->device_addr = 0; > + vq->cb = NULL; > + vq->private = NULL; > + vringh_init_iotlb(&vq->vring, vdpasim_features, VDPASIM_QUEUE_MAX, > + false, 0, 0, 0); > +} > + > +static void vdpasim_reset(struct vdpasim *vdpasim) > +{ > + int i; > + > + for (i = 0; i < VDPASIM_VQ_NUM; i++) > + vdpasim_vq_reset(&vdpasim->vqs[i]); > + > + vhost_iotlb_reset(vdpasim->iommu); > + > + vdpasim->features = 0; > + vdpasim->status = 0; > + ++vdpasim->generation; > +} > + > +static void vdpasim_work(struct work_struct *work) > +{ > + struct vdpasim *vdpasim = container_of(work, struct > + vdpasim, work); > + struct vdpasim_virtqueue *txq = &vdpasim->vqs[1]; > + struct vdpasim_virtqueue *rxq = &vdpasim->vqs[0]; > + size_t read, write, total_write; > + int err; > + int pkts = 0; > + > + spin_lock(&vdpasim->lock); > + > + if (!(vdpasim->status & VIRTIO_CONFIG_S_DRIVER_OK)) > + goto out; > + > + if (!txq->ready || !rxq->ready) > + goto out; > + > + while (true) { > + total_write = 0; > + err = vringh_getdesc_iotlb(&txq->vring, &txq->iov, NULL, > + &txq->head, GFP_ATOMIC); > + if (err <= 0) > + break; > + > + err = vringh_getdesc_iotlb(&rxq->vring, NULL, &rxq->iov, > + &rxq->head, GFP_ATOMIC); > + if (err <= 0) { > + vringh_complete_iotlb(&txq->vring, txq->head, 0); > + break; > + } > + > + while (true) { > + read = vringh_iov_pull_iotlb(&txq->vring, &txq->iov, > + vdpasim->buffer, > + PAGE_SIZE); > + if (read <= 0) > + break; > + > + write = vringh_iov_push_iotlb(&rxq->vring, &rxq->iov, > + vdpasim->buffer, read); > + if (write <= 0) > + break; > + > + total_write += write; > + } > + > + /* Make sure data is wrote before advancing index */ > + smp_wmb(); > + > + vringh_complete_iotlb(&txq->vring, txq->head, 0); > + vringh_complete_iotlb(&rxq->vring, rxq->head, total_write); > + > + /* Make sure used is visible before rasing the interrupt. */ > + smp_wmb(); > + > + local_bh_disable(); > + if (txq->cb) > + txq->cb(txq->private); > + if (rxq->cb) > + rxq->cb(rxq->private); > + local_bh_enable(); > + > + if (++pkts > 4) { > + schedule_work(&vdpasim->work); > + goto out; > + } > + } > + > +out: > + spin_unlock(&vdpasim->lock); > +} > + > +static int dir_to_perm(enum dma_data_direction dir) > +{ > + int perm = -EFAULT; > + > + switch (dir) { > + case DMA_FROM_DEVICE: > + perm = VHOST_MAP_WO; > + break; > + case DMA_TO_DEVICE: > + perm = VHOST_MAP_RO; > + break; > + case DMA_BIDIRECTIONAL: > + perm = VHOST_MAP_RW; > + break; > + default: > + break; > + } > + > + return perm; > +} > + > +static dma_addr_t vdpasim_map_page(struct device *dev, struct page *page, > + unsigned long offset, size_t size, > + enum dma_data_direction dir, > + unsigned long attrs) > +{ > + struct vdpa_device *vdpa = dev_to_vdpa(dev); > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + struct vhost_iotlb *iommu = vdpasim->iommu; > + u64 pa = (page_to_pfn(page) << PAGE_SHIFT) + offset; > + int ret, perm = dir_to_perm(dir); > + > + if (perm < 0) > + return DMA_MAPPING_ERROR; > + > + /* For simplicity, use identical mapping to avoid e.g iova > + * allocator. > + */ > + ret = vhost_iotlb_add_range(iommu, pa, pa + size - 1, > + pa, dir_to_perm(dir)); > + if (ret) > + return DMA_MAPPING_ERROR; > + > + return (dma_addr_t)(pa); > +} > + > +static void vdpasim_unmap_page(struct device *dev, dma_addr_t dma_addr, > + size_t size, enum dma_data_direction dir, > + unsigned long attrs) > +{ > + struct vdpa_device *vdpa = dev_to_vdpa(dev); > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + struct vhost_iotlb *iommu = vdpasim->iommu; > + > + vhost_iotlb_del_range(iommu, (u64)dma_addr, > + (u64)dma_addr + size - 1); > +} > + > +static void *vdpasim_alloc_coherent(struct device *dev, size_t size, > + dma_addr_t *dma_addr, gfp_t flag, > + unsigned long attrs) > +{ > + struct vdpa_device *vdpa = dev_to_vdpa(dev); > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + struct vhost_iotlb *iommu = vdpasim->iommu; > + void *addr = kmalloc(size, flag); > + int ret; > + > + if (!addr) > + *dma_addr = DMA_MAPPING_ERROR; > + else { > + u64 pa = virt_to_phys(addr); > + > + ret = vhost_iotlb_add_range(iommu, (u64)pa, > + (u64)pa + size - 1, > + pa, VHOST_MAP_RW); > + if (ret) { > + *dma_addr = DMA_MAPPING_ERROR; > + kfree(addr); > + addr = NULL; > + } else > + *dma_addr = (dma_addr_t)pa; > + } > + > + return addr; > +} > + > +static void vdpasim_free_coherent(struct device *dev, size_t size, > + void *vaddr, dma_addr_t dma_addr, > + unsigned long attrs) > +{ > + struct vdpa_device *vdpa = dev_to_vdpa(dev); > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + struct vhost_iotlb *iommu = vdpasim->iommu; > + > + vhost_iotlb_del_range(iommu, (u64)dma_addr, > + (u64)dma_addr + size - 1); > + kfree(phys_to_virt((uintptr_t)dma_addr)); > +} > + > +static const struct dma_map_ops vdpasim_dma_ops = { > + .map_page = vdpasim_map_page, > + .unmap_page = vdpasim_unmap_page, > + .alloc = vdpasim_alloc_coherent, > + .free = vdpasim_free_coherent, > +}; > + > +static void vdpasim_release_dev(struct device *_d) > +{ > + struct vdpa_device *vdpa = dev_to_vdpa(_d); > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + > + kfree(vdpasim->buffer); > + kfree(vdpasim); > +} > + > +static const struct vdpa_config_ops vdpasim_net_config_ops; > + > +static struct vdpasim *vdpasim_create(void) > +{ > + struct vdpasim *vdpasim; > + struct virtio_net_config *config; > + struct vdpa_device *vdpa; > + struct device *dev; > + int ret = -ENOMEM; > + > + vdpasim = kzalloc(sizeof(*vdpasim), GFP_KERNEL); > + if (!vdpasim) > + goto err_vdpa_alloc; > + > + vdpasim->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL); > + if (!vdpasim->buffer) > + goto err_buffer_alloc; > + > + vdpasim->iommu = vhost_iotlb_alloc(2048, 0); > + if (!vdpasim->iommu) > + goto err_iotlb; > + > + config = &vdpasim->config; > + config->mtu = 1500; > + config->status = VIRTIO_NET_S_LINK_UP; > + eth_random_addr(config->mac); > + > + INIT_WORK(&vdpasim->work, vdpasim_work); > + spin_lock_init(&vdpasim->lock); > + > + vdpa = &vdpasim->vdpa; > + vdpa->dev.release = vdpasim_release_dev; > + > + vringh_set_iotlb(&vdpasim->vqs[0].vring, vdpasim->iommu); > + vringh_set_iotlb(&vdpasim->vqs[1].vring, vdpasim->iommu); > + > + dev = &vdpa->dev; > + dev->coherent_dma_mask = DMA_BIT_MASK(64); > + set_dma_ops(dev, &vdpasim_dma_ops); > + > + ret = vdpa_init_device(vdpa, &vdpasim_dev->dev, dev, > + &vdpasim_net_config_ops); > + if (ret) > + goto err_init; > + > + ret = vdpa_register_device(vdpa); > + if (ret) > + goto err_register; > + > + return vdpasim; > + > +err_register: > + put_device(&vdpa->dev); > +err_init: > + vhost_iotlb_free(vdpasim->iommu); > +err_iotlb: > + kfree(vdpasim->buffer); > +err_buffer_alloc: > + kfree(vdpasim); > +err_vdpa_alloc: > + return ERR_PTR(ret); > +} > + > +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 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 (vq->ready) > + schedule_work(&vdpasim->work); > +} > + > +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]; > + > + spin_lock(&vdpasim->lock); > + vq->ready = ready; > + if (vq->ready) > + vdpasim_queue_ready(vdpasim, idx); > + spin_unlock(&vdpasim->lock); > +} > + > +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, u64 state) > +{ > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx]; > + struct vringh *vrh = &vq->vring; > + > + spin_lock(&vdpasim->lock); > + vrh->last_avail_idx = state; > + spin_unlock(&vdpasim->lock); > + > + return 0; > +} > + > +static u64 vdpasim_get_vq_state(struct vdpa_device *vdpa, u16 idx) > +{ > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx]; > + struct vringh *vrh = &vq->vring; > + > + return vrh->last_avail_idx; > +} > + > +static u16 vdpasim_get_vq_align(struct vdpa_device *vdpa) > +{ > + return VDPASIM_QUEUE_ALIGN; > +} > + > +static u64 vdpasim_get_features(struct vdpa_device *vdpa) > +{ > + return vdpasim_features; > +} > + > +static int vdpasim_set_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_IOMMU_PLATFORM))) > + return -EINVAL; > + > + vdpasim->features = features & vdpasim_features; > + > + return 0; > +} > + > +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) > +{ > + return VDPASIM_DEVICE_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; > + > + spin_lock(&vdpasim->lock); > + status = vdpasim->status; > + spin_unlock(&vdpasim->lock); > + > + return vdpasim->status; > +} > + > +static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status) > +{ > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + > + spin_lock(&vdpasim->lock); > + vdpasim->status = status; > + if (status == 0) > + vdpasim_reset(vdpasim); > + spin_unlock(&vdpasim->lock); > +} > + > +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 < sizeof(struct virtio_net_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) > +{ > + /* No writable config supportted by vdpasim */ > +} > + > +static u32 vdpasim_get_generation(struct vdpa_device *vdpa) > +{ > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + > + return vdpasim->generation; > +} > + > +static int vdpasim_set_map(struct vdpa_device *vdpa, > + struct vhost_iotlb *iotlb) > +{ > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + struct vhost_iotlb_map *map; > + u64 start = 0ULL, last = 0ULL - 1; > + int ret; > + > + vhost_iotlb_reset(vdpasim->iommu); > + > + for (map = vhost_iotlb_itree_first(iotlb, start, last); map; > + map = vhost_iotlb_itree_next(map, start, last)) { > + ret = vhost_iotlb_add_range(vdpasim->iommu, map->start, > + map->last, map->addr, map->perm); > + if (ret) > + goto err; > + } > + return 0; > + > +err: > + vhost_iotlb_reset(vdpasim->iommu); > + return ret; > +} > + > +static int vdpasim_dma_map(struct vdpa_device *vdpa, u64 iova, u64 size, > + u64 pa, u32 perm) > +{ > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + > + return vhost_iotlb_add_range(vdpasim->iommu, iova, > + iova + size - 1, pa, perm); > +} > + > +static int vdpasim_dma_unmap(struct vdpa_device *vdpa, u64 iova, u64 size) > +{ > + struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > + > + vhost_iotlb_del_range(vdpasim->iommu, iova, iova + size - 1); > + > + return 0; > +} > + > +static const struct vdpa_config_ops vdpasim_net_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_vq_state = vdpasim_get_vq_state, > + .get_vq_align = vdpasim_get_vq_align, > + .get_features = vdpasim_get_features, > + .set_features = vdpasim_set_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, > + .get_config = vdpasim_get_config, > + .set_config = vdpasim_set_config, > + .get_generation = vdpasim_get_generation, > + .set_map = vdpasim_set_map, > + .dma_map = vdpasim_dma_map, > + .dma_unmap = vdpasim_dma_unmap, > +}; > + > +static void vdpasim_device_release(struct device *dev) > +{ > + struct vdpasim_dev *vdpasim_dev = > + container_of(dev, struct vdpasim_dev, dev); > + > + vdpasim_dev->dev.bus = NULL; > + kfree(vdpasim_dev); > +} > + > +static int __init vdpasim_dev_init(void) > +{ > + struct device *dev; > + int ret = 0; > + > + vdpasim_dev = kzalloc(sizeof(*vdpasim_dev), GFP_KERNEL); > + if (!vdpasim_dev) > + return -ENOMEM; > + > + dev = &vdpasim_dev->dev; > + dev->release = vdpasim_device_release; > + dev_set_name(dev, "%s", VDPASIM_NAME); > + > + ret = device_register(&vdpasim_dev->dev); > + if (ret) > + goto err_register; > + > + if (!vdpasim_create()) > + goto err_register; > + > + return 0; > + > +err_register: > + kfree(vdpasim_dev); > + vdpasim_dev = NULL; > + return ret; > +} > + > +static int vdpasim_device_remove_cb(struct device *dev, void *data) > +{ > + struct vdpa_device *vdpa = dev_to_vdpa(dev); > + > + vdpa_unregister_device(vdpa); > + > + return 0; > +} > + > +static void __exit vdpasim_dev_exit(void) > +{ > + device_for_each_child(&vdpasim_dev->dev, NULL, > + vdpasim_device_remove_cb); > + device_unregister(&vdpasim_dev->dev); > +} > + > +module_init(vdpasim_dev_init) > +module_exit(vdpasim_dev_exit) > + > +MODULE_VERSION(DRV_VERSION); > +MODULE_LICENSE(DRV_LICENSE); > +MODULE_AUTHOR(DRV_AUTHOR); > +MODULE_DESCRIPTION(DRV_DESC); > -- > 2.19.1 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
