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path: root/drivers/virtio/vdpa/vdpa_sim/vdpa_sim.c
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Diffstat (limited to 'drivers/virtio/vdpa/vdpa_sim/vdpa_sim.c')
-rw-r--r--drivers/virtio/vdpa/vdpa_sim/vdpa_sim.c629
1 files changed, 0 insertions, 629 deletions
diff --git a/drivers/virtio/vdpa/vdpa_sim/vdpa_sim.c b/drivers/virtio/vdpa/vdpa_sim/vdpa_sim.c
deleted file mode 100644
index 6e8a0cf2fdeb..000000000000
--- a/drivers/virtio/vdpa/vdpa_sim/vdpa_sim.c
+++ /dev/null
@@ -1,629 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * VDPA networking device simulator.
- *
- * 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/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/dma-mapping.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 <jasowang@redhat.com>"
-#define DRV_DESC "vDPA Device Simulator"
-#define DRV_LICENSE "GPL v2"
-
-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 vdpa_device vdpa;
- struct vdpasim_virtqueue vqs[2];
- struct work_struct work;
- /* spinlock to synchronize virtqueue state */
- spinlock_t lock;
- struct virtio_net_config config;
- struct vhost_iotlb *iommu;
- void *buffer;
- u32 status;
- u32 generation;
- u64 features;
-};
-
-static struct vdpasim *vdpasim_dev;
-
-static struct vdpasim *vdpa_to_sim(struct vdpa_device *vdpa)
-{
- return container_of(vdpa, struct vdpasim, vdpa);
-}
-
-static struct vdpasim *dev_to_sim(struct device *dev)
-{
- struct vdpa_device *vdpa = dev_to_vdpa(dev);
-
- return vdpa_to_sim(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, NULL, NULL, NULL);
-}
-
-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 vdpasim *vdpasim = dev_to_sim(dev);
- 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 vdpasim *vdpasim = dev_to_sim(dev);
- 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 vdpasim *vdpasim = dev_to_sim(dev);
- 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 vdpasim *vdpasim = dev_to_sim(dev);
- 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 const struct vdpa_config_ops vdpasim_net_config_ops;
-
-static struct vdpasim *vdpasim_create(void)
-{
- struct virtio_net_config *config;
- struct vdpasim *vdpasim;
- struct device *dev;
- int ret = -ENOMEM;
-
- vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL,
- &vdpasim_net_config_ops);
- if (!vdpasim)
- goto err_alloc;
-
- INIT_WORK(&vdpasim->work, vdpasim_work);
- spin_lock_init(&vdpasim->lock);
-
- dev = &vdpasim->vdpa.dev;
- dev->coherent_dma_mask = DMA_BIT_MASK(64);
- set_dma_ops(dev, &vdpasim_dma_ops);
-
- vdpasim->iommu = vhost_iotlb_alloc(2048, 0);
- if (!vdpasim->iommu)
- goto err_iommu;
-
- vdpasim->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!vdpasim->buffer)
- goto err_iommu;
-
- config = &vdpasim->config;
- config->mtu = 1500;
- config->status = VIRTIO_NET_S_LINK_UP;
- eth_random_addr(config->mac);
-
- vringh_set_iotlb(&vdpasim->vqs[0].vring, vdpasim->iommu);
- vringh_set_iotlb(&vdpasim->vqs[1].vring, vdpasim->iommu);
-
- vdpasim->vdpa.dma_dev = dev;
- ret = vdpa_register_device(&vdpasim->vdpa);
- if (ret)
- goto err_iommu;
-
- return vdpasim;
-
-err_iommu:
- put_device(dev);
-err_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 void vdpasim_free(struct vdpa_device *vdpa)
-{
- struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
-
- cancel_work_sync(&vdpasim->work);
- kfree(vdpasim->buffer);
- if (vdpasim->iommu)
- vhost_iotlb_free(vdpasim->iommu);
-}
-
-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,
- .free = vdpasim_free,
-};
-
-static int __init vdpasim_dev_init(void)
-{
- vdpasim_dev = vdpasim_create();
-
- if (!IS_ERR(vdpasim_dev))
- return 0;
-
- return PTR_ERR(vdpasim_dev);
-}
-
-static void __exit vdpasim_dev_exit(void)
-{
- struct vdpa_device *vdpa = &vdpasim_dev->vdpa;
-
- vdpa_unregister_device(vdpa);
-}
-
-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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-16 06:53:48 +0000