(VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK | \
VIRTIO_CONFIG_S_FEATURES_OK | VIRTIO_CONFIG_S_NEEDS_RESET | VIRTIO_CONFIG_S_FAILED)
+ #define MLX5_FEATURE(_mvdev, _feature) (!!((_mvdev)->actual_features & BIT_ULL(_feature)))
+
struct mlx5_vdpa_net_resources {
u32 tisn;
u32 tdn;
u16 avail_index;
u16 used_index;
bool ready;
- struct vdpa_callback cb;
bool restore;
};
u64 device_addr;
u64 driver_addr;
u32 num_ent;
- struct vdpa_callback event_cb;
/* Resources for implementing the notification channel from the device
* to the driver. fwqp is the firmware end of an RC connection; the
*/
#define MLX5_MAX_SUPPORTED_VQS 16
+ static bool is_index_valid(struct mlx5_vdpa_dev *mvdev, u16 idx)
+ {
+ if (unlikely(idx > mvdev->max_idx))
+ return false;
+
+ return true;
+ }
+
struct mlx5_vdpa_net {
struct mlx5_vdpa_dev mvdev;
struct mlx5_vdpa_net_resources res;
struct virtio_net_config config;
struct mlx5_vdpa_virtqueue vqs[MLX5_MAX_SUPPORTED_VQS];
+ struct vdpa_callback event_cbs[MLX5_MAX_SUPPORTED_VQS + 1];
/* Serialize vq resources creation and destruction. This is required
* since memory map might change and we need to destroy and create
struct mlx5_flow_handle *rx_rule;
bool setup;
u16 mtu;
+ u32 cur_num_vqs;
};
static void free_resources(struct mlx5_vdpa_net *ndev);
static void init_mvqs(struct mlx5_vdpa_net *ndev);
- static int setup_driver(struct mlx5_vdpa_net *ndev);
+ static int setup_driver(struct mlx5_vdpa_dev *mvdev);
static void teardown_driver(struct mlx5_vdpa_net *ndev);
static bool mlx5_vdpa_debug;
+ #define MLX5_CVQ_MAX_ENT 16
+
#define MLX5_LOG_VIO_FLAG(_feature) \
do { \
if (features & BIT_ULL(_feature)) \
mlx5_vdpa_info(mvdev, "%s\n", #_status); \
} while (0)
+ /* TODO: cross-endian support */
+ static inline bool mlx5_vdpa_is_little_endian(struct mlx5_vdpa_dev *mvdev)
+ {
+ return virtio_legacy_is_little_endian() ||
+ (mvdev->actual_features & BIT_ULL(VIRTIO_F_VERSION_1));
+ }
+
+ static u16 mlx5vdpa16_to_cpu(struct mlx5_vdpa_dev *mvdev, __virtio16 val)
+ {
+ return __virtio16_to_cpu(mlx5_vdpa_is_little_endian(mvdev), val);
+ }
+
+ static __virtio16 cpu_to_mlx5vdpa16(struct mlx5_vdpa_dev *mvdev, u16 val)
+ {
+ return __cpu_to_virtio16(mlx5_vdpa_is_little_endian(mvdev), val);
+ }
+
static inline u32 mlx5_vdpa_max_qps(int max_vqs)
{
return max_vqs / 2;
}
+ static u16 ctrl_vq_idx(struct mlx5_vdpa_dev *mvdev)
+ {
+ if (!(mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_MQ)))
+ return 2;
+
+ return 2 * mlx5_vdpa_max_qps(mvdev->max_vqs);
+ }
+
+ static bool is_ctrl_vq_idx(struct mlx5_vdpa_dev *mvdev, u16 idx)
+ {
+ return idx == ctrl_vq_idx(mvdev);
+ }
+
static void print_status(struct mlx5_vdpa_dev *mvdev, u8 status, bool set)
{
if (status & ~VALID_STATUS_MASK)
static void mlx5_vdpa_handle_completions(struct mlx5_vdpa_virtqueue *mvq, int num)
{
+ struct mlx5_vdpa_net *ndev = mvq->ndev;
+ struct vdpa_callback *event_cb;
+
+ event_cb = &ndev->event_cbs[mvq->index];
mlx5_cq_set_ci(&mvq->cq.mcq);
/* make sure CQ cosumer update is visible to the hardware before updating
*/
dma_wmb();
rx_post(&mvq->vqqp, num);
- if (mvq->event_cb.callback)
- mvq->event_cb.callback(mvq->event_cb.private);
+ if (event_cb->callback)
+ event_cb->callback(event_cb->private);
}
static void mlx5_vdpa_cq_comp(struct mlx5_core_cq *mcq, struct mlx5_eqe *eqe)
cqc = MLX5_ADDR_OF(create_cq_in, in, cq_context);
MLX5_SET(cqc, cqc, log_cq_size, ilog2(num_ent));
MLX5_SET(cqc, cqc, uar_page, ndev->mvdev.res.uar->index);
- MLX5_SET(cqc, cqc, c_eqn, eqn);
+ MLX5_SET(cqc, cqc, c_eqn_or_apu_element, eqn);
MLX5_SET64(cqc, cqc, dbr_addr, vcq->db.dma);
err = mlx5_core_create_cq(mdev, &vcq->mcq, in, inlen, out, sizeof(out));
if (!mvq->num_ent)
return 0;
- if (mvq->initialized) {
- mlx5_vdpa_warn(&ndev->mvdev, "attempt re init\n");
- return -EINVAL;
- }
+ if (mvq->initialized)
+ return 0;
err = cq_create(ndev, idx, mvq->num_ent);
if (err)
static int create_rqt(struct mlx5_vdpa_net *ndev)
{
- int log_max_rqt;
__be32 *list;
+ int max_rqt;
void *rqtc;
int inlen;
void *in;
int i, j;
int err;
- log_max_rqt = min_t(int, 1, MLX5_CAP_GEN(ndev->mvdev.mdev, log_max_rqt_size));
- if (log_max_rqt < 1)
+ max_rqt = min_t(int, MLX5_MAX_SUPPORTED_VQS / 2,
+ 1 << MLX5_CAP_GEN(ndev->mvdev.mdev, log_max_rqt_size));
+ if (max_rqt < 1)
return -EOPNOTSUPP;
- inlen = MLX5_ST_SZ_BYTES(create_rqt_in) + (1 << log_max_rqt) * MLX5_ST_SZ_BYTES(rq_num);
+ inlen = MLX5_ST_SZ_BYTES(create_rqt_in) + max_rqt * MLX5_ST_SZ_BYTES(rq_num);
in = kzalloc(inlen, GFP_KERNEL);
if (!in)
return -ENOMEM;
rqtc = MLX5_ADDR_OF(create_rqt_in, in, rqt_context);
MLX5_SET(rqtc, rqtc, list_q_type, MLX5_RQTC_LIST_Q_TYPE_VIRTIO_NET_Q);
- MLX5_SET(rqtc, rqtc, rqt_max_size, 1 << log_max_rqt);
- MLX5_SET(rqtc, rqtc, rqt_actual_size, 1);
+ MLX5_SET(rqtc, rqtc, rqt_max_size, max_rqt);
list = MLX5_ADDR_OF(rqtc, rqtc, rq_num[0]);
- for (i = 0, j = 0; j < ndev->mvdev.max_vqs; j++) {
+ for (i = 0, j = 0; j < max_rqt; j++) {
if (!ndev->vqs[j].initialized)
continue;
i++;
}
}
+ MLX5_SET(rqtc, rqtc, rqt_actual_size, i);
err = mlx5_vdpa_create_rqt(&ndev->mvdev, in, inlen, &ndev->res.rqtn);
kfree(in);
return 0;
}
+ #define MLX5_MODIFY_RQT_NUM_RQS ((u64)1)
+
+ static int modify_rqt(struct mlx5_vdpa_net *ndev, int num)
+ {
+ __be32 *list;
+ int max_rqt;
+ void *rqtc;
+ int inlen;
+ void *in;
+ int i, j;
+ int err;
+
+ max_rqt = min_t(int, ndev->cur_num_vqs / 2,
+ 1 << MLX5_CAP_GEN(ndev->mvdev.mdev, log_max_rqt_size));
+ if (max_rqt < 1)
+ return -EOPNOTSUPP;
+
+ inlen = MLX5_ST_SZ_BYTES(modify_rqt_in) + max_rqt * MLX5_ST_SZ_BYTES(rq_num);
+ in = kzalloc(inlen, GFP_KERNEL);
+ if (!in)
+ return -ENOMEM;
+
+ MLX5_SET(modify_rqt_in, in, uid, ndev->mvdev.res.uid);
+ MLX5_SET64(modify_rqt_in, in, bitmask, MLX5_MODIFY_RQT_NUM_RQS);
+ rqtc = MLX5_ADDR_OF(modify_rqt_in, in, ctx);
+ MLX5_SET(rqtc, rqtc, list_q_type, MLX5_RQTC_LIST_Q_TYPE_VIRTIO_NET_Q);
+
+ list = MLX5_ADDR_OF(rqtc, rqtc, rq_num[0]);
+ for (i = 0, j = 0; j < num; j++) {
+ if (!ndev->vqs[j].initialized)
+ continue;
+
+ if (!vq_is_tx(ndev->vqs[j].index)) {
+ list[i] = cpu_to_be32(ndev->vqs[j].virtq_id);
+ i++;
+ }
+ }
+ MLX5_SET(rqtc, rqtc, rqt_actual_size, i);
+ err = mlx5_vdpa_modify_rqt(&ndev->mvdev, in, inlen, ndev->res.rqtn);
+ kfree(in);
+ if (err)
+ return err;
+
+ return 0;
+ }
+
static void destroy_rqt(struct mlx5_vdpa_net *ndev)
{
mlx5_vdpa_destroy_rqt(&ndev->mvdev, ndev->res.rqtn);
ndev->rx_rule = NULL;
}
+ static virtio_net_ctrl_ack handle_ctrl_mac(struct mlx5_vdpa_dev *mvdev, u8 cmd)
+ {
+ struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
+ struct mlx5_control_vq *cvq = &mvdev->cvq;
+ virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
+ struct mlx5_core_dev *pfmdev;
+ size_t read;
+ u8 mac[ETH_ALEN];
+
+ pfmdev = pci_get_drvdata(pci_physfn(mvdev->mdev->pdev));
+ switch (cmd) {
+ case VIRTIO_NET_CTRL_MAC_ADDR_SET:
+ read = vringh_iov_pull_iotlb(&cvq->vring, &cvq->riov, (void *)mac, ETH_ALEN);
+ if (read != ETH_ALEN)
+ break;
+
+ if (!memcmp(ndev->config.mac, mac, 6)) {
+ status = VIRTIO_NET_OK;
+ break;
+ }
+
+ if (!is_zero_ether_addr(ndev->config.mac)) {
+ if (mlx5_mpfs_del_mac(pfmdev, ndev->config.mac)) {
+ mlx5_vdpa_warn(mvdev, "failed to delete old MAC %pM from MPFS table\n",
+ ndev->config.mac);
+ break;
+ }
+ }
+
+ if (mlx5_mpfs_add_mac(pfmdev, mac)) {
+ mlx5_vdpa_warn(mvdev, "failed to insert new MAC %pM into MPFS table\n",
+ mac);
+ break;
+ }
+
+ memcpy(ndev->config.mac, mac, ETH_ALEN);
+ status = VIRTIO_NET_OK;
+ break;
+
+ default:
+ break;
+ }
+
+ return status;
+ }
+
+ static int change_num_qps(struct mlx5_vdpa_dev *mvdev, int newqps)
+ {
+ struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
+ int cur_qps = ndev->cur_num_vqs / 2;
+ int err;
+ int i;
+
+ if (cur_qps > newqps) {
+ err = modify_rqt(ndev, 2 * newqps);
+ if (err)
+ return err;
+
+ for (i = ndev->cur_num_vqs - 1; i >= 2 * newqps; i--)
+ teardown_vq(ndev, &ndev->vqs[i]);
+
+ ndev->cur_num_vqs = 2 * newqps;
+ } else {
+ ndev->cur_num_vqs = 2 * newqps;
+ for (i = cur_qps * 2; i < 2 * newqps; i++) {
+ err = setup_vq(ndev, &ndev->vqs[i]);
+ if (err)
+ goto clean_added;
+ }
+ err = modify_rqt(ndev, 2 * newqps);
+ if (err)
+ goto clean_added;
+ }
+ return 0;
+
+ clean_added:
+ for (--i; i >= cur_qps; --i)
+ teardown_vq(ndev, &ndev->vqs[i]);
+
+ return err;
+ }
+
+ static virtio_net_ctrl_ack handle_ctrl_mq(struct mlx5_vdpa_dev *mvdev, u8 cmd)
+ {
+ struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
+ virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
+ struct mlx5_control_vq *cvq = &mvdev->cvq;
+ struct virtio_net_ctrl_mq mq;
+ size_t read;
+ u16 newqps;
+
+ switch (cmd) {
+ case VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET:
+ read = vringh_iov_pull_iotlb(&cvq->vring, &cvq->riov, (void *)&mq, sizeof(mq));
+ if (read != sizeof(mq))
+ break;
+
+ newqps = mlx5vdpa16_to_cpu(mvdev, mq.virtqueue_pairs);
+ if (ndev->cur_num_vqs == 2 * newqps) {
+ status = VIRTIO_NET_OK;
+ break;
+ }
+
+ if (newqps & (newqps - 1))
+ break;
+
+ if (!change_num_qps(mvdev, newqps))
+ status = VIRTIO_NET_OK;
+
+ break;
+ default:
+ break;
+ }
+
+ return status;
+ }
+
+ static void mlx5_cvq_kick_handler(struct work_struct *work)
+ {
+ virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
+ struct virtio_net_ctrl_hdr ctrl;
+ struct mlx5_ctrl_wq_ent *wqent;
+ struct mlx5_vdpa_dev *mvdev;
+ struct mlx5_control_vq *cvq;
+ struct mlx5_vdpa_net *ndev;
+ size_t read, write;
+ int err;
+
+ wqent = container_of(work, struct mlx5_ctrl_wq_ent, work);
+ mvdev = wqent->mvdev;
+ ndev = to_mlx5_vdpa_ndev(mvdev);
+ cvq = &mvdev->cvq;
+ if (!(ndev->mvdev.actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ)))
+ goto out;
+
+ if (!cvq->ready)
+ goto out;
+
+ while (true) {
+ err = vringh_getdesc_iotlb(&cvq->vring, &cvq->riov, &cvq->wiov, &cvq->head,
+ GFP_ATOMIC);
+ if (err <= 0)
+ break;
+
+ read = vringh_iov_pull_iotlb(&cvq->vring, &cvq->riov, &ctrl, sizeof(ctrl));
+ if (read != sizeof(ctrl))
+ break;
+
+ switch (ctrl.class) {
+ case VIRTIO_NET_CTRL_MAC:
+ status = handle_ctrl_mac(mvdev, ctrl.cmd);
+ break;
+ case VIRTIO_NET_CTRL_MQ:
+ status = handle_ctrl_mq(mvdev, ctrl.cmd);
+ break;
+
+ default:
+ break;
+ }
+
+ /* Make sure data is written before advancing index */
+ smp_wmb();
+
+ write = vringh_iov_push_iotlb(&cvq->vring, &cvq->wiov, &status, sizeof(status));
+ vringh_complete_iotlb(&cvq->vring, cvq->head, write);
+ vringh_kiov_cleanup(&cvq->riov);
+ vringh_kiov_cleanup(&cvq->wiov);
+
+ if (vringh_need_notify_iotlb(&cvq->vring))
+ vringh_notify(&cvq->vring);
+ }
+ out:
+ kfree(wqent);
+ }
+
static void mlx5_vdpa_kick_vq(struct vdpa_device *vdev, u16 idx)
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
- struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[idx];
+ struct mlx5_vdpa_virtqueue *mvq;
+ struct mlx5_ctrl_wq_ent *wqent;
+
+ if (!is_index_valid(mvdev, idx))
+ return;
+
+ if (unlikely(is_ctrl_vq_idx(mvdev, idx))) {
+ if (!mvdev->cvq.ready)
+ return;
+
+ wqent = kzalloc(sizeof(*wqent), GFP_ATOMIC);
+ if (!wqent)
+ return;
+ wqent->mvdev = mvdev;
+ INIT_WORK(&wqent->work, mlx5_cvq_kick_handler);
+ queue_work(mvdev->wq, &wqent->work);
+ return;
+ }
+
+ mvq = &ndev->vqs[idx];
if (unlikely(!mvq->ready))
return;
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
- struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[idx];
+ struct mlx5_vdpa_virtqueue *mvq;
+
+ if (!is_index_valid(mvdev, idx))
+ return -EINVAL;
+ if (is_ctrl_vq_idx(mvdev, idx)) {
+ mvdev->cvq.desc_addr = desc_area;
+ mvdev->cvq.device_addr = device_area;
+ mvdev->cvq.driver_addr = driver_area;
+ return 0;
+ }
+
+ mvq = &ndev->vqs[idx];
mvq->desc_addr = desc_area;
mvq->device_addr = device_area;
mvq->driver_addr = driver_area;
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
struct mlx5_vdpa_virtqueue *mvq;
+ if (!is_index_valid(mvdev, idx) || is_ctrl_vq_idx(mvdev, idx))
+ return;
+
mvq = &ndev->vqs[idx];
mvq->num_ent = num;
}
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
- struct mlx5_vdpa_virtqueue *vq = &ndev->vqs[idx];
- vq->event_cb = *cb;
+ ndev->event_cbs[idx] = *cb;
+ }
+
+ static void mlx5_cvq_notify(struct vringh *vring)
+ {
+ struct mlx5_control_vq *cvq = container_of(vring, struct mlx5_control_vq, vring);
+
+ if (!cvq->event_cb.callback)
+ return;
+
+ cvq->event_cb.callback(cvq->event_cb.private);
+ }
+
+ static void set_cvq_ready(struct mlx5_vdpa_dev *mvdev, bool ready)
+ {
+ struct mlx5_control_vq *cvq = &mvdev->cvq;
+
+ cvq->ready = ready;
+ if (!ready)
+ return;
+
+ cvq->vring.notify = mlx5_cvq_notify;
}
static void mlx5_vdpa_set_vq_ready(struct vdpa_device *vdev, u16 idx, bool ready)
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
- struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[idx];
+ struct mlx5_vdpa_virtqueue *mvq;
+
+ if (!is_index_valid(mvdev, idx))
+ return;
+
+ if (is_ctrl_vq_idx(mvdev, idx)) {
+ set_cvq_ready(mvdev, ready);
+ return;
+ }
+ mvq = &ndev->vqs[idx];
if (!ready)
suspend_vq(ndev, mvq);
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
- struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[idx];
- return mvq->ready;
+ if (!is_index_valid(mvdev, idx))
+ return false;
+
+ if (is_ctrl_vq_idx(mvdev, idx))
+ return mvdev->cvq.ready;
+
+ return ndev->vqs[idx].ready;
}
static int mlx5_vdpa_set_vq_state(struct vdpa_device *vdev, u16 idx,
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
- struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[idx];
+ struct mlx5_vdpa_virtqueue *mvq;
+ if (!is_index_valid(mvdev, idx))
+ return -EINVAL;
+
+ if (is_ctrl_vq_idx(mvdev, idx)) {
+ mvdev->cvq.vring.last_avail_idx = state->split.avail_index;
+ return 0;
+ }
+
+ mvq = &ndev->vqs[idx];
if (mvq->fw_state == MLX5_VIRTIO_NET_Q_OBJECT_STATE_RDY) {
mlx5_vdpa_warn(mvdev, "can't modify available index\n");
return -EINVAL;
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
- struct mlx5_vdpa_virtqueue *mvq = &ndev->vqs[idx];
+ struct mlx5_vdpa_virtqueue *mvq;
struct mlx5_virtq_attr attr;
int err;
+ if (!is_index_valid(mvdev, idx))
+ return -EINVAL;
+
+ if (is_ctrl_vq_idx(mvdev, idx)) {
+ state->split.avail_index = mvdev->cvq.vring.last_avail_idx;
+ return 0;
+ }
+
+ mvq = &ndev->vqs[idx];
/* If the virtq object was destroyed, use the value saved at
* the last minute of suspend_vq. This caters for userspace
* that cares about emulating the index after vq is stopped.
u16 dev_features;
dev_features = MLX5_CAP_DEV_VDPA_EMULATION(mvdev->mdev, device_features_bits_mask);
- ndev->mvdev.mlx_features = mlx_to_vritio_features(dev_features);
+ ndev->mvdev.mlx_features |= mlx_to_vritio_features(dev_features);
if (MLX5_CAP_DEV_VDPA_EMULATION(mvdev->mdev, virtio_version_1_0))
ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_F_VERSION_1);
ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_F_ACCESS_PLATFORM);
+ ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_NET_F_CTRL_VQ);
+ ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR);
+ ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_NET_F_MQ);
+
print_features(mvdev, ndev->mvdev.mlx_features, false);
return ndev->mvdev.mlx_features;
}
return 0;
}
- static int setup_virtqueues(struct mlx5_vdpa_net *ndev)
+ static int setup_virtqueues(struct mlx5_vdpa_dev *mvdev)
{
+ struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
+ struct mlx5_control_vq *cvq = &mvdev->cvq;
int err;
int i;
- for (i = 0; i < 2 * mlx5_vdpa_max_qps(ndev->mvdev.max_vqs); i++) {
+ for (i = 0; i < 2 * mlx5_vdpa_max_qps(mvdev->max_vqs); i++) {
err = setup_vq(ndev, &ndev->vqs[i]);
if (err)
goto err_vq;
}
+ if (mvdev->actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ)) {
+ err = vringh_init_iotlb(&cvq->vring, mvdev->actual_features,
+ MLX5_CVQ_MAX_ENT, false,
+ (struct vring_desc *)(uintptr_t)cvq->desc_addr,
+ (struct vring_avail *)(uintptr_t)cvq->driver_addr,
+ (struct vring_used *)(uintptr_t)cvq->device_addr);
+ if (err)
+ goto err_vq;
+ }
+
return 0;
err_vq:
}
}
- /* TODO: cross-endian support */
- static inline bool mlx5_vdpa_is_little_endian(struct mlx5_vdpa_dev *mvdev)
- {
- return virtio_legacy_is_little_endian() ||
- (mvdev->actual_features & BIT_ULL(VIRTIO_F_VERSION_1));
- }
-
- static __virtio16 cpu_to_mlx5vdpa16(struct mlx5_vdpa_dev *mvdev, u16 val)
+ static void update_cvq_info(struct mlx5_vdpa_dev *mvdev)
{
- return __cpu_to_virtio16(mlx5_vdpa_is_little_endian(mvdev), val);
+ if (MLX5_FEATURE(mvdev, VIRTIO_NET_F_CTRL_VQ)) {
+ if (MLX5_FEATURE(mvdev, VIRTIO_NET_F_MQ)) {
+ /* MQ supported. CVQ index is right above the last data virtqueue's */
+ mvdev->max_idx = mvdev->max_vqs;
+ } else {
+ /* Only CVQ supportted. data virtqueues occupy indices 0 and 1.
+ * CVQ gets index 2
+ */
+ mvdev->max_idx = 2;
+ }
+ } else {
+ /* Two data virtqueues only: one for rx and one for tx */
+ mvdev->max_idx = 1;
+ }
}
static int mlx5_vdpa_set_features(struct vdpa_device *vdev, u64 features)
ndev->mvdev.actual_features = features & ndev->mvdev.mlx_features;
ndev->config.mtu = cpu_to_mlx5vdpa16(mvdev, ndev->mtu);
ndev->config.status |= cpu_to_mlx5vdpa16(mvdev, VIRTIO_NET_S_LINK_UP);
+ update_cvq_info(mvdev);
return err;
}
static int save_channel_info(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq)
{
struct mlx5_vq_restore_info *ri = &mvq->ri;
- struct mlx5_virtq_attr attr;
+ struct mlx5_virtq_attr attr = {};
int err;
- if (!mvq->initialized)
- return 0;
-
- err = query_virtqueue(ndev, mvq, &attr);
- if (err)
- return err;
+ if (mvq->initialized) {
+ err = query_virtqueue(ndev, mvq, &attr);
+ if (err)
+ return err;
+ }
ri->avail_index = attr.available_index;
ri->used_index = attr.used_index;
ri->desc_addr = mvq->desc_addr;
ri->device_addr = mvq->device_addr;
ri->driver_addr = mvq->driver_addr;
- ri->cb = mvq->event_cb;
ri->restore = true;
return 0;
}
mvq->desc_addr = ri->desc_addr;
mvq->device_addr = ri->device_addr;
mvq->driver_addr = ri->driver_addr;
- mvq->event_cb = ri->cb;
}
}
- static int mlx5_vdpa_change_map(struct mlx5_vdpa_net *ndev, struct vhost_iotlb *iotlb)
+ static int mlx5_vdpa_change_map(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb *iotlb)
{
+ struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
int err;
suspend_vqs(ndev);
goto err_mr;
teardown_driver(ndev);
- mlx5_vdpa_destroy_mr(&ndev->mvdev);
- err = mlx5_vdpa_create_mr(&ndev->mvdev, iotlb);
+ mlx5_vdpa_destroy_mr(mvdev);
+ err = mlx5_vdpa_create_mr(mvdev, iotlb);
if (err)
goto err_mr;
- if (!(ndev->mvdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
+ if (!(mvdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
return 0;
restore_channels_info(ndev);
- err = setup_driver(ndev);
+ err = setup_driver(mvdev);
if (err)
goto err_setup;
return 0;
err_setup:
- mlx5_vdpa_destroy_mr(&ndev->mvdev);
+ mlx5_vdpa_destroy_mr(mvdev);
err_mr:
return err;
}
- static int setup_driver(struct mlx5_vdpa_net *ndev)
+ static int setup_driver(struct mlx5_vdpa_dev *mvdev)
{
+ struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
int err;
mutex_lock(&ndev->reslock);
if (ndev->setup) {
- mlx5_vdpa_warn(&ndev->mvdev, "setup driver called for already setup driver\n");
+ mlx5_vdpa_warn(mvdev, "setup driver called for already setup driver\n");
err = 0;
goto out;
}
- err = setup_virtqueues(ndev);
+ err = setup_virtqueues(mvdev);
if (err) {
- mlx5_vdpa_warn(&ndev->mvdev, "setup_virtqueues\n");
+ mlx5_vdpa_warn(mvdev, "setup_virtqueues\n");
goto out;
}
err = create_rqt(ndev);
if (err) {
- mlx5_vdpa_warn(&ndev->mvdev, "create_rqt\n");
+ mlx5_vdpa_warn(mvdev, "create_rqt\n");
goto err_rqt;
}
err = create_tir(ndev);
if (err) {
- mlx5_vdpa_warn(&ndev->mvdev, "create_tir\n");
+ mlx5_vdpa_warn(mvdev, "create_tir\n");
goto err_tir;
}
err = add_fwd_to_tir(ndev);
if (err) {
- mlx5_vdpa_warn(&ndev->mvdev, "add_fwd_to_tir\n");
+ mlx5_vdpa_warn(mvdev, "add_fwd_to_tir\n");
goto err_fwd;
}
ndev->setup = true;
int err;
print_status(mvdev, status, true);
- if (!status) {
- mlx5_vdpa_info(mvdev, "performing device reset\n");
- teardown_driver(ndev);
- clear_vqs_ready(ndev);
- mlx5_vdpa_destroy_mr(&ndev->mvdev);
- ndev->mvdev.status = 0;
- ndev->mvdev.mlx_features = 0;
- ++mvdev->generation;
- if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
- if (mlx5_vdpa_create_mr(mvdev, NULL))
- mlx5_vdpa_warn(mvdev, "create MR failed\n");
- }
- return;
- }
if ((status ^ ndev->mvdev.status) & VIRTIO_CONFIG_S_DRIVER_OK) {
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
- err = setup_driver(ndev);
+ err = setup_driver(mvdev);
if (err) {
mlx5_vdpa_warn(mvdev, "failed to setup driver\n");
goto err_setup;
ndev->mvdev.status |= VIRTIO_CONFIG_S_FAILED;
}
+ static int mlx5_vdpa_reset(struct vdpa_device *vdev)
+ {
+ struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
+ struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
+
+ print_status(mvdev, 0, true);
+ mlx5_vdpa_info(mvdev, "performing device reset\n");
+ teardown_driver(ndev);
+ clear_vqs_ready(ndev);
+ mlx5_vdpa_destroy_mr(&ndev->mvdev);
+ ndev->mvdev.status = 0;
+ ndev->mvdev.mlx_features = 0;
+ memset(ndev->event_cbs, 0, sizeof(ndev->event_cbs));
+ ndev->mvdev.actual_features = 0;
+ ++mvdev->generation;
+ if (MLX5_CAP_GEN(mvdev->mdev, umem_uid_0)) {
+ if (mlx5_vdpa_create_mr(mvdev, NULL))
+ mlx5_vdpa_warn(mvdev, "create MR failed\n");
+ }
+
+ return 0;
+ }
+
static size_t mlx5_vdpa_get_config_size(struct vdpa_device *vdev)
{
return sizeof(struct virtio_net_config);
static int mlx5_vdpa_set_map(struct vdpa_device *vdev, struct vhost_iotlb *iotlb)
{
struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
- struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
bool change_map;
int err;
}
if (change_map)
- return mlx5_vdpa_change_map(ndev, iotlb);
+ return mlx5_vdpa_change_map(mvdev, iotlb);
return 0;
}
struct mlx5_vdpa_net *ndev;
phys_addr_t addr;
+ if (!is_index_valid(mvdev, idx) || is_ctrl_vq_idx(mvdev, idx))
+ return ret;
+
/* If SF BAR size is smaller than PAGE_SIZE, do not use direct
* notification to avoid the risk of mapping pages that contain BAR of more
* than one SF
.get_vendor_id = mlx5_vdpa_get_vendor_id,
.get_status = mlx5_vdpa_get_status,
.set_status = mlx5_vdpa_set_status,
+ .reset = mlx5_vdpa_reset,
.get_config_size = mlx5_vdpa_get_config_size,
.get_config = mlx5_vdpa_get_config,
.set_config = mlx5_vdpa_set_config,
max_vqs = min_t(u32, max_vqs, MLX5_MAX_SUPPORTED_VQS);
ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops,
- name);
+ name, false);
if (IS_ERR(ndev))
return PTR_ERR(ndev);
err = mlx5_mpfs_add_mac(pfmdev, config->mac);
if (err)
goto err_mtu;
+
+ ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_NET_F_MAC);
}
+ config->max_virtqueue_pairs = cpu_to_mlx5vdpa16(mvdev, mlx5_vdpa_max_qps(max_vqs));
mvdev->vdev.dma_dev = &mdev->pdev->dev;
err = mlx5_vdpa_alloc_resources(&ndev->mvdev);
if (err)
if (err)
goto err_mr;
+ mvdev->wq = create_singlethread_workqueue("mlx5_vdpa_ctrl_wq");
+ if (!mvdev->wq) {
+ err = -ENOMEM;
+ goto err_res2;
+ }
+
+ ndev->cur_num_vqs = 2 * mlx5_vdpa_max_qps(max_vqs);
mvdev->vdev.mdev = &mgtdev->mgtdev;
- err = _vdpa_register_device(&mvdev->vdev, 2 * mlx5_vdpa_max_qps(max_vqs));
+ err = _vdpa_register_device(&mvdev->vdev, ndev->cur_num_vqs + 1);
if (err)
goto err_reg;
return 0;
err_reg:
+ destroy_workqueue(mvdev->wq);
+ err_res2:
free_resources(ndev);
err_mr:
mlx5_vdpa_destroy_mr(mvdev);
static void mlx5_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *dev)
{
struct mlx5_vdpa_mgmtdev *mgtdev = container_of(v_mdev, struct mlx5_vdpa_mgmtdev, mgtdev);
+ struct mlx5_vdpa_dev *mvdev = to_mvdev(dev);
+ destroy_workqueue(mvdev->wq);
_vdpa_unregister_device(dev);
mgtdev->ndev = NULL;
}
--- /dev/null
- if (eventfd_signal_count()) {
+ // SPDX-License-Identifier: GPL-2.0-only
+ /*
+ * VDUSE: vDPA Device in Userspace
+ *
+ * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved.
+ *
+ * Author: Xie Yongji <xieyongji@bytedance.com>
+ *
+ */
+
+ #include <linux/init.h>
+ #include <linux/module.h>
+ #include <linux/cdev.h>
+ #include <linux/device.h>
+ #include <linux/eventfd.h>
+ #include <linux/slab.h>
+ #include <linux/wait.h>
+ #include <linux/dma-map-ops.h>
+ #include <linux/poll.h>
+ #include <linux/file.h>
+ #include <linux/uio.h>
+ #include <linux/vdpa.h>
+ #include <linux/nospec.h>
+ #include <uapi/linux/vduse.h>
+ #include <uapi/linux/vdpa.h>
+ #include <uapi/linux/virtio_config.h>
+ #include <uapi/linux/virtio_ids.h>
+ #include <uapi/linux/virtio_blk.h>
+ #include <linux/mod_devicetable.h>
+
+ #include "iova_domain.h"
+
+ #define DRV_AUTHOR "Yongji Xie <xieyongji@bytedance.com>"
+ #define DRV_DESC "vDPA Device in Userspace"
+ #define DRV_LICENSE "GPL v2"
+
+ #define VDUSE_DEV_MAX (1U << MINORBITS)
+ #define VDUSE_BOUNCE_SIZE (64 * 1024 * 1024)
+ #define VDUSE_IOVA_SIZE (128 * 1024 * 1024)
+ #define VDUSE_MSG_DEFAULT_TIMEOUT 30
+
+ struct vduse_virtqueue {
+ u16 index;
+ u16 num_max;
+ u32 num;
+ u64 desc_addr;
+ u64 driver_addr;
+ u64 device_addr;
+ struct vdpa_vq_state state;
+ bool ready;
+ bool kicked;
+ spinlock_t kick_lock;
+ spinlock_t irq_lock;
+ struct eventfd_ctx *kickfd;
+ struct vdpa_callback cb;
+ struct work_struct inject;
+ struct work_struct kick;
+ };
+
+ struct vduse_dev;
+
+ struct vduse_vdpa {
+ struct vdpa_device vdpa;
+ struct vduse_dev *dev;
+ };
+
+ struct vduse_dev {
+ struct vduse_vdpa *vdev;
+ struct device *dev;
+ struct vduse_virtqueue *vqs;
+ struct vduse_iova_domain *domain;
+ char *name;
+ struct mutex lock;
+ spinlock_t msg_lock;
+ u64 msg_unique;
+ u32 msg_timeout;
+ wait_queue_head_t waitq;
+ struct list_head send_list;
+ struct list_head recv_list;
+ struct vdpa_callback config_cb;
+ struct work_struct inject;
+ spinlock_t irq_lock;
+ int minor;
+ bool broken;
+ bool connected;
+ u64 api_version;
+ u64 device_features;
+ u64 driver_features;
+ u32 device_id;
+ u32 vendor_id;
+ u32 generation;
+ u32 config_size;
+ void *config;
+ u8 status;
+ u32 vq_num;
+ u32 vq_align;
+ };
+
+ struct vduse_dev_msg {
+ struct vduse_dev_request req;
+ struct vduse_dev_response resp;
+ struct list_head list;
+ wait_queue_head_t waitq;
+ bool completed;
+ };
+
+ struct vduse_control {
+ u64 api_version;
+ };
+
+ static DEFINE_MUTEX(vduse_lock);
+ static DEFINE_IDR(vduse_idr);
+
+ static dev_t vduse_major;
+ static struct class *vduse_class;
+ static struct cdev vduse_ctrl_cdev;
+ static struct cdev vduse_cdev;
+ static struct workqueue_struct *vduse_irq_wq;
+
+ static u32 allowed_device_id[] = {
+ VIRTIO_ID_BLOCK,
+ };
+
+ static inline struct vduse_dev *vdpa_to_vduse(struct vdpa_device *vdpa)
+ {
+ struct vduse_vdpa *vdev = container_of(vdpa, struct vduse_vdpa, vdpa);
+
+ return vdev->dev;
+ }
+
+ static inline struct vduse_dev *dev_to_vduse(struct device *dev)
+ {
+ struct vdpa_device *vdpa = dev_to_vdpa(dev);
+
+ return vdpa_to_vduse(vdpa);
+ }
+
+ static struct vduse_dev_msg *vduse_find_msg(struct list_head *head,
+ uint32_t request_id)
+ {
+ struct vduse_dev_msg *msg;
+
+ list_for_each_entry(msg, head, list) {
+ if (msg->req.request_id == request_id) {
+ list_del(&msg->list);
+ return msg;
+ }
+ }
+
+ return NULL;
+ }
+
+ static struct vduse_dev_msg *vduse_dequeue_msg(struct list_head *head)
+ {
+ struct vduse_dev_msg *msg = NULL;
+
+ if (!list_empty(head)) {
+ msg = list_first_entry(head, struct vduse_dev_msg, list);
+ list_del(&msg->list);
+ }
+
+ return msg;
+ }
+
+ static void vduse_enqueue_msg(struct list_head *head,
+ struct vduse_dev_msg *msg)
+ {
+ list_add_tail(&msg->list, head);
+ }
+
+ static void vduse_dev_broken(struct vduse_dev *dev)
+ {
+ struct vduse_dev_msg *msg, *tmp;
+
+ if (unlikely(dev->broken))
+ return;
+
+ list_splice_init(&dev->recv_list, &dev->send_list);
+ list_for_each_entry_safe(msg, tmp, &dev->send_list, list) {
+ list_del(&msg->list);
+ msg->completed = 1;
+ msg->resp.result = VDUSE_REQ_RESULT_FAILED;
+ wake_up(&msg->waitq);
+ }
+ dev->broken = true;
+ wake_up(&dev->waitq);
+ }
+
+ static int vduse_dev_msg_sync(struct vduse_dev *dev,
+ struct vduse_dev_msg *msg)
+ {
+ int ret;
+
+ if (unlikely(dev->broken))
+ return -EIO;
+
+ init_waitqueue_head(&msg->waitq);
+ spin_lock(&dev->msg_lock);
+ if (unlikely(dev->broken)) {
+ spin_unlock(&dev->msg_lock);
+ return -EIO;
+ }
+ msg->req.request_id = dev->msg_unique++;
+ vduse_enqueue_msg(&dev->send_list, msg);
+ wake_up(&dev->waitq);
+ spin_unlock(&dev->msg_lock);
+ if (dev->msg_timeout)
+ ret = wait_event_killable_timeout(msg->waitq, msg->completed,
+ (long)dev->msg_timeout * HZ);
+ else
+ ret = wait_event_killable(msg->waitq, msg->completed);
+
+ spin_lock(&dev->msg_lock);
+ if (!msg->completed) {
+ list_del(&msg->list);
+ msg->resp.result = VDUSE_REQ_RESULT_FAILED;
+ /* Mark the device as malfunction when there is a timeout */
+ if (!ret)
+ vduse_dev_broken(dev);
+ }
+ ret = (msg->resp.result == VDUSE_REQ_RESULT_OK) ? 0 : -EIO;
+ spin_unlock(&dev->msg_lock);
+
+ return ret;
+ }
+
+ static int vduse_dev_get_vq_state_packed(struct vduse_dev *dev,
+ struct vduse_virtqueue *vq,
+ struct vdpa_vq_state_packed *packed)
+ {
+ struct vduse_dev_msg msg = { 0 };
+ int ret;
+
+ msg.req.type = VDUSE_GET_VQ_STATE;
+ msg.req.vq_state.index = vq->index;
+
+ ret = vduse_dev_msg_sync(dev, &msg);
+ if (ret)
+ return ret;
+
+ packed->last_avail_counter =
+ msg.resp.vq_state.packed.last_avail_counter & 0x0001;
+ packed->last_avail_idx =
+ msg.resp.vq_state.packed.last_avail_idx & 0x7FFF;
+ packed->last_used_counter =
+ msg.resp.vq_state.packed.last_used_counter & 0x0001;
+ packed->last_used_idx =
+ msg.resp.vq_state.packed.last_used_idx & 0x7FFF;
+
+ return 0;
+ }
+
+ static int vduse_dev_get_vq_state_split(struct vduse_dev *dev,
+ struct vduse_virtqueue *vq,
+ struct vdpa_vq_state_split *split)
+ {
+ struct vduse_dev_msg msg = { 0 };
+ int ret;
+
+ msg.req.type = VDUSE_GET_VQ_STATE;
+ msg.req.vq_state.index = vq->index;
+
+ ret = vduse_dev_msg_sync(dev, &msg);
+ if (ret)
+ return ret;
+
+ split->avail_index = msg.resp.vq_state.split.avail_index;
+
+ return 0;
+ }
+
+ static int vduse_dev_set_status(struct vduse_dev *dev, u8 status)
+ {
+ struct vduse_dev_msg msg = { 0 };
+
+ msg.req.type = VDUSE_SET_STATUS;
+ msg.req.s.status = status;
+
+ return vduse_dev_msg_sync(dev, &msg);
+ }
+
+ static int vduse_dev_update_iotlb(struct vduse_dev *dev,
+ u64 start, u64 last)
+ {
+ struct vduse_dev_msg msg = { 0 };
+
+ if (last < start)
+ return -EINVAL;
+
+ msg.req.type = VDUSE_UPDATE_IOTLB;
+ msg.req.iova.start = start;
+ msg.req.iova.last = last;
+
+ return vduse_dev_msg_sync(dev, &msg);
+ }
+
+ static ssize_t vduse_dev_read_iter(struct kiocb *iocb, struct iov_iter *to)
+ {
+ struct file *file = iocb->ki_filp;
+ struct vduse_dev *dev = file->private_data;
+ struct vduse_dev_msg *msg;
+ int size = sizeof(struct vduse_dev_request);
+ ssize_t ret;
+
+ if (iov_iter_count(to) < size)
+ return -EINVAL;
+
+ spin_lock(&dev->msg_lock);
+ while (1) {
+ msg = vduse_dequeue_msg(&dev->send_list);
+ if (msg)
+ break;
+
+ ret = -EAGAIN;
+ if (file->f_flags & O_NONBLOCK)
+ goto unlock;
+
+ spin_unlock(&dev->msg_lock);
+ ret = wait_event_interruptible_exclusive(dev->waitq,
+ !list_empty(&dev->send_list));
+ if (ret)
+ return ret;
+
+ spin_lock(&dev->msg_lock);
+ }
+ spin_unlock(&dev->msg_lock);
+ ret = copy_to_iter(&msg->req, size, to);
+ spin_lock(&dev->msg_lock);
+ if (ret != size) {
+ ret = -EFAULT;
+ vduse_enqueue_msg(&dev->send_list, msg);
+ goto unlock;
+ }
+ vduse_enqueue_msg(&dev->recv_list, msg);
+ unlock:
+ spin_unlock(&dev->msg_lock);
+
+ return ret;
+ }
+
+ static bool is_mem_zero(const char *ptr, int size)
+ {
+ int i;
+
+ for (i = 0; i < size; i++) {
+ if (ptr[i])
+ return false;
+ }
+ return true;
+ }
+
+ static ssize_t vduse_dev_write_iter(struct kiocb *iocb, struct iov_iter *from)
+ {
+ struct file *file = iocb->ki_filp;
+ struct vduse_dev *dev = file->private_data;
+ struct vduse_dev_response resp;
+ struct vduse_dev_msg *msg;
+ size_t ret;
+
+ ret = copy_from_iter(&resp, sizeof(resp), from);
+ if (ret != sizeof(resp))
+ return -EINVAL;
+
+ if (!is_mem_zero((const char *)resp.reserved, sizeof(resp.reserved)))
+ return -EINVAL;
+
+ spin_lock(&dev->msg_lock);
+ msg = vduse_find_msg(&dev->recv_list, resp.request_id);
+ if (!msg) {
+ ret = -ENOENT;
+ goto unlock;
+ }
+
+ memcpy(&msg->resp, &resp, sizeof(resp));
+ msg->completed = 1;
+ wake_up(&msg->waitq);
+ unlock:
+ spin_unlock(&dev->msg_lock);
+
+ return ret;
+ }
+
+ static __poll_t vduse_dev_poll(struct file *file, poll_table *wait)
+ {
+ struct vduse_dev *dev = file->private_data;
+ __poll_t mask = 0;
+
+ poll_wait(file, &dev->waitq, wait);
+
+ spin_lock(&dev->msg_lock);
+
+ if (unlikely(dev->broken))
+ mask |= EPOLLERR;
+ if (!list_empty(&dev->send_list))
+ mask |= EPOLLIN | EPOLLRDNORM;
+ if (!list_empty(&dev->recv_list))
+ mask |= EPOLLOUT | EPOLLWRNORM;
+
+ spin_unlock(&dev->msg_lock);
+
+ return mask;
+ }
+
+ static void vduse_dev_reset(struct vduse_dev *dev)
+ {
+ int i;
+ struct vduse_iova_domain *domain = dev->domain;
+
+ /* The coherent mappings are handled in vduse_dev_free_coherent() */
+ if (domain->bounce_map)
+ vduse_domain_reset_bounce_map(domain);
+
+ dev->status = 0;
+ dev->driver_features = 0;
+ dev->generation++;
+ spin_lock(&dev->irq_lock);
+ dev->config_cb.callback = NULL;
+ dev->config_cb.private = NULL;
+ spin_unlock(&dev->irq_lock);
+ flush_work(&dev->inject);
+
+ for (i = 0; i < dev->vq_num; i++) {
+ struct vduse_virtqueue *vq = &dev->vqs[i];
+
+ vq->ready = false;
+ vq->desc_addr = 0;
+ vq->driver_addr = 0;
+ vq->device_addr = 0;
+ vq->num = 0;
+ memset(&vq->state, 0, sizeof(vq->state));
+
+ spin_lock(&vq->kick_lock);
+ vq->kicked = false;
+ if (vq->kickfd)
+ eventfd_ctx_put(vq->kickfd);
+ vq->kickfd = NULL;
+ spin_unlock(&vq->kick_lock);
+
+ spin_lock(&vq->irq_lock);
+ vq->cb.callback = NULL;
+ vq->cb.private = NULL;
+ spin_unlock(&vq->irq_lock);
+ flush_work(&vq->inject);
+ flush_work(&vq->kick);
+ }
+ }
+
+ static int vduse_vdpa_set_vq_address(struct vdpa_device *vdpa, u16 idx,
+ u64 desc_area, u64 driver_area,
+ u64 device_area)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ struct vduse_virtqueue *vq = &dev->vqs[idx];
+
+ vq->desc_addr = desc_area;
+ vq->driver_addr = driver_area;
+ vq->device_addr = device_area;
+
+ return 0;
+ }
+
+ static void vduse_vq_kick(struct vduse_virtqueue *vq)
+ {
+ spin_lock(&vq->kick_lock);
+ if (!vq->ready)
+ goto unlock;
+
+ if (vq->kickfd)
+ eventfd_signal(vq->kickfd, 1);
+ else
+ vq->kicked = true;
+ unlock:
+ spin_unlock(&vq->kick_lock);
+ }
+
+ static void vduse_vq_kick_work(struct work_struct *work)
+ {
+ struct vduse_virtqueue *vq = container_of(work,
+ struct vduse_virtqueue, kick);
+
+ vduse_vq_kick(vq);
+ }
+
+ static void vduse_vdpa_kick_vq(struct vdpa_device *vdpa, u16 idx)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ struct vduse_virtqueue *vq = &dev->vqs[idx];
+
++ if (!eventfd_signal_allowed()) {
+ schedule_work(&vq->kick);
+ return;
+ }
+ vduse_vq_kick(vq);
+ }
+
+ static void vduse_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
+ struct vdpa_callback *cb)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ struct vduse_virtqueue *vq = &dev->vqs[idx];
+
+ spin_lock(&vq->irq_lock);
+ vq->cb.callback = cb->callback;
+ vq->cb.private = cb->private;
+ spin_unlock(&vq->irq_lock);
+ }
+
+ static void vduse_vdpa_set_vq_num(struct vdpa_device *vdpa, u16 idx, u32 num)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ struct vduse_virtqueue *vq = &dev->vqs[idx];
+
+ vq->num = num;
+ }
+
+ static void vduse_vdpa_set_vq_ready(struct vdpa_device *vdpa,
+ u16 idx, bool ready)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ struct vduse_virtqueue *vq = &dev->vqs[idx];
+
+ vq->ready = ready;
+ }
+
+ static bool vduse_vdpa_get_vq_ready(struct vdpa_device *vdpa, u16 idx)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ struct vduse_virtqueue *vq = &dev->vqs[idx];
+
+ return vq->ready;
+ }
+
+ static int vduse_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 idx,
+ const struct vdpa_vq_state *state)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ struct vduse_virtqueue *vq = &dev->vqs[idx];
+
+ if (dev->driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
+ vq->state.packed.last_avail_counter =
+ state->packed.last_avail_counter;
+ vq->state.packed.last_avail_idx = state->packed.last_avail_idx;
+ vq->state.packed.last_used_counter =
+ state->packed.last_used_counter;
+ vq->state.packed.last_used_idx = state->packed.last_used_idx;
+ } else
+ vq->state.split.avail_index = state->split.avail_index;
+
+ return 0;
+ }
+
+ static int vduse_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 idx,
+ struct vdpa_vq_state *state)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ struct vduse_virtqueue *vq = &dev->vqs[idx];
+
+ if (dev->driver_features & BIT_ULL(VIRTIO_F_RING_PACKED))
+ return vduse_dev_get_vq_state_packed(dev, vq, &state->packed);
+
+ return vduse_dev_get_vq_state_split(dev, vq, &state->split);
+ }
+
+ static u32 vduse_vdpa_get_vq_align(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ return dev->vq_align;
+ }
+
+ static u64 vduse_vdpa_get_features(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ return dev->device_features;
+ }
+
+ static int vduse_vdpa_set_features(struct vdpa_device *vdpa, u64 features)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ dev->driver_features = features;
+ return 0;
+ }
+
+ static void vduse_vdpa_set_config_cb(struct vdpa_device *vdpa,
+ struct vdpa_callback *cb)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ spin_lock(&dev->irq_lock);
+ dev->config_cb.callback = cb->callback;
+ dev->config_cb.private = cb->private;
+ spin_unlock(&dev->irq_lock);
+ }
+
+ static u16 vduse_vdpa_get_vq_num_max(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ u16 num_max = 0;
+ int i;
+
+ for (i = 0; i < dev->vq_num; i++)
+ if (num_max < dev->vqs[i].num_max)
+ num_max = dev->vqs[i].num_max;
+
+ return num_max;
+ }
+
+ static u32 vduse_vdpa_get_device_id(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ return dev->device_id;
+ }
+
+ static u32 vduse_vdpa_get_vendor_id(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ return dev->vendor_id;
+ }
+
+ static u8 vduse_vdpa_get_status(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ return dev->status;
+ }
+
+ static void vduse_vdpa_set_status(struct vdpa_device *vdpa, u8 status)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ if (vduse_dev_set_status(dev, status))
+ return;
+
+ dev->status = status;
+ }
+
+ static size_t vduse_vdpa_get_config_size(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ return dev->config_size;
+ }
+
+ static void vduse_vdpa_get_config(struct vdpa_device *vdpa, unsigned int offset,
+ void *buf, unsigned int len)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ if (len > dev->config_size - offset)
+ return;
+
+ memcpy(buf, dev->config + offset, len);
+ }
+
+ static void vduse_vdpa_set_config(struct vdpa_device *vdpa, unsigned int offset,
+ const void *buf, unsigned int len)
+ {
+ /* Now we only support read-only configuration space */
+ }
+
+ static int vduse_vdpa_reset(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ if (vduse_dev_set_status(dev, 0))
+ return -EIO;
+
+ vduse_dev_reset(dev);
+
+ return 0;
+ }
+
+ static u32 vduse_vdpa_get_generation(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ return dev->generation;
+ }
+
+ static int vduse_vdpa_set_map(struct vdpa_device *vdpa,
+ struct vhost_iotlb *iotlb)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+ int ret;
+
+ ret = vduse_domain_set_map(dev->domain, iotlb);
+ if (ret)
+ return ret;
+
+ ret = vduse_dev_update_iotlb(dev, 0ULL, ULLONG_MAX);
+ if (ret) {
+ vduse_domain_clear_map(dev->domain, iotlb);
+ return ret;
+ }
+
+ return 0;
+ }
+
+ static void vduse_vdpa_free(struct vdpa_device *vdpa)
+ {
+ struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+ dev->vdev = NULL;
+ }
+
+ static const struct vdpa_config_ops vduse_vdpa_config_ops = {
+ .set_vq_address = vduse_vdpa_set_vq_address,
+ .kick_vq = vduse_vdpa_kick_vq,
+ .set_vq_cb = vduse_vdpa_set_vq_cb,
+ .set_vq_num = vduse_vdpa_set_vq_num,
+ .set_vq_ready = vduse_vdpa_set_vq_ready,
+ .get_vq_ready = vduse_vdpa_get_vq_ready,
+ .set_vq_state = vduse_vdpa_set_vq_state,
+ .get_vq_state = vduse_vdpa_get_vq_state,
+ .get_vq_align = vduse_vdpa_get_vq_align,
+ .get_features = vduse_vdpa_get_features,
+ .set_features = vduse_vdpa_set_features,
+ .set_config_cb = vduse_vdpa_set_config_cb,
+ .get_vq_num_max = vduse_vdpa_get_vq_num_max,
+ .get_device_id = vduse_vdpa_get_device_id,
+ .get_vendor_id = vduse_vdpa_get_vendor_id,
+ .get_status = vduse_vdpa_get_status,
+ .set_status = vduse_vdpa_set_status,
+ .get_config_size = vduse_vdpa_get_config_size,
+ .get_config = vduse_vdpa_get_config,
+ .set_config = vduse_vdpa_set_config,
+ .get_generation = vduse_vdpa_get_generation,
+ .reset = vduse_vdpa_reset,
+ .set_map = vduse_vdpa_set_map,
+ .free = vduse_vdpa_free,
+ };
+
+ static dma_addr_t vduse_dev_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ unsigned long attrs)
+ {
+ struct vduse_dev *vdev = dev_to_vduse(dev);
+ struct vduse_iova_domain *domain = vdev->domain;
+
+ return vduse_domain_map_page(domain, page, offset, size, dir, attrs);
+ }
+
+ static void vduse_dev_unmap_page(struct device *dev, dma_addr_t dma_addr,
+ size_t size, enum dma_data_direction dir,
+ unsigned long attrs)
+ {
+ struct vduse_dev *vdev = dev_to_vduse(dev);
+ struct vduse_iova_domain *domain = vdev->domain;
+
+ return vduse_domain_unmap_page(domain, dma_addr, size, dir, attrs);
+ }
+
+ static void *vduse_dev_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_addr, gfp_t flag,
+ unsigned long attrs)
+ {
+ struct vduse_dev *vdev = dev_to_vduse(dev);
+ struct vduse_iova_domain *domain = vdev->domain;
+ unsigned long iova;
+ void *addr;
+
+ *dma_addr = DMA_MAPPING_ERROR;
+ addr = vduse_domain_alloc_coherent(domain, size,
+ (dma_addr_t *)&iova, flag, attrs);
+ if (!addr)
+ return NULL;
+
+ *dma_addr = (dma_addr_t)iova;
+
+ return addr;
+ }
+
+ static void vduse_dev_free_coherent(struct device *dev, size_t size,
+ void *vaddr, dma_addr_t dma_addr,
+ unsigned long attrs)
+ {
+ struct vduse_dev *vdev = dev_to_vduse(dev);
+ struct vduse_iova_domain *domain = vdev->domain;
+
+ vduse_domain_free_coherent(domain, size, vaddr, dma_addr, attrs);
+ }
+
+ static size_t vduse_dev_max_mapping_size(struct device *dev)
+ {
+ struct vduse_dev *vdev = dev_to_vduse(dev);
+ struct vduse_iova_domain *domain = vdev->domain;
+
+ return domain->bounce_size;
+ }
+
+ static const struct dma_map_ops vduse_dev_dma_ops = {
+ .map_page = vduse_dev_map_page,
+ .unmap_page = vduse_dev_unmap_page,
+ .alloc = vduse_dev_alloc_coherent,
+ .free = vduse_dev_free_coherent,
+ .max_mapping_size = vduse_dev_max_mapping_size,
+ };
+
+ static unsigned int perm_to_file_flags(u8 perm)
+ {
+ unsigned int flags = 0;
+
+ switch (perm) {
+ case VDUSE_ACCESS_WO:
+ flags |= O_WRONLY;
+ break;
+ case VDUSE_ACCESS_RO:
+ flags |= O_RDONLY;
+ break;
+ case VDUSE_ACCESS_RW:
+ flags |= O_RDWR;
+ break;
+ default:
+ WARN(1, "invalidate vhost IOTLB permission\n");
+ break;
+ }
+
+ return flags;
+ }
+
+ static int vduse_kickfd_setup(struct vduse_dev *dev,
+ struct vduse_vq_eventfd *eventfd)
+ {
+ struct eventfd_ctx *ctx = NULL;
+ struct vduse_virtqueue *vq;
+ u32 index;
+
+ if (eventfd->index >= dev->vq_num)
+ return -EINVAL;
+
+ index = array_index_nospec(eventfd->index, dev->vq_num);
+ vq = &dev->vqs[index];
+ if (eventfd->fd >= 0) {
+ ctx = eventfd_ctx_fdget(eventfd->fd);
+ if (IS_ERR(ctx))
+ return PTR_ERR(ctx);
+ } else if (eventfd->fd != VDUSE_EVENTFD_DEASSIGN)
+ return 0;
+
+ spin_lock(&vq->kick_lock);
+ if (vq->kickfd)
+ eventfd_ctx_put(vq->kickfd);
+ vq->kickfd = ctx;
+ if (vq->ready && vq->kicked && vq->kickfd) {
+ eventfd_signal(vq->kickfd, 1);
+ vq->kicked = false;
+ }
+ spin_unlock(&vq->kick_lock);
+
+ return 0;
+ }
+
+ static bool vduse_dev_is_ready(struct vduse_dev *dev)
+ {
+ int i;
+
+ for (i = 0; i < dev->vq_num; i++)
+ if (!dev->vqs[i].num_max)
+ return false;
+
+ return true;
+ }
+
+ static void vduse_dev_irq_inject(struct work_struct *work)
+ {
+ struct vduse_dev *dev = container_of(work, struct vduse_dev, inject);
+
+ spin_lock_irq(&dev->irq_lock);
+ if (dev->config_cb.callback)
+ dev->config_cb.callback(dev->config_cb.private);
+ spin_unlock_irq(&dev->irq_lock);
+ }
+
+ static void vduse_vq_irq_inject(struct work_struct *work)
+ {
+ struct vduse_virtqueue *vq = container_of(work,
+ struct vduse_virtqueue, inject);
+
+ spin_lock_irq(&vq->irq_lock);
+ if (vq->ready && vq->cb.callback)
+ vq->cb.callback(vq->cb.private);
+ spin_unlock_irq(&vq->irq_lock);
+ }
+
+ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+ {
+ struct vduse_dev *dev = file->private_data;
+ void __user *argp = (void __user *)arg;
+ int ret;
+
+ if (unlikely(dev->broken))
+ return -EPERM;
+
+ switch (cmd) {
+ case VDUSE_IOTLB_GET_FD: {
+ struct vduse_iotlb_entry entry;
+ struct vhost_iotlb_map *map;
+ struct vdpa_map_file *map_file;
+ struct vduse_iova_domain *domain = dev->domain;
+ struct file *f = NULL;
+
+ ret = -EFAULT;
+ if (copy_from_user(&entry, argp, sizeof(entry)))
+ break;
+
+ ret = -EINVAL;
+ if (entry.start > entry.last)
+ break;
+
+ spin_lock(&domain->iotlb_lock);
+ map = vhost_iotlb_itree_first(domain->iotlb,
+ entry.start, entry.last);
+ if (map) {
+ map_file = (struct vdpa_map_file *)map->opaque;
+ f = get_file(map_file->file);
+ entry.offset = map_file->offset;
+ entry.start = map->start;
+ entry.last = map->last;
+ entry.perm = map->perm;
+ }
+ spin_unlock(&domain->iotlb_lock);
+ ret = -EINVAL;
+ if (!f)
+ break;
+
+ ret = -EFAULT;
+ if (copy_to_user(argp, &entry, sizeof(entry))) {
+ fput(f);
+ break;
+ }
+ ret = receive_fd(f, perm_to_file_flags(entry.perm));
+ fput(f);
+ break;
+ }
+ case VDUSE_DEV_GET_FEATURES:
+ /*
+ * Just mirror what driver wrote here.
+ * The driver is expected to check FEATURE_OK later.
+ */
+ ret = put_user(dev->driver_features, (u64 __user *)argp);
+ break;
+ case VDUSE_DEV_SET_CONFIG: {
+ struct vduse_config_data config;
+ unsigned long size = offsetof(struct vduse_config_data,
+ buffer);
+
+ ret = -EFAULT;
+ if (copy_from_user(&config, argp, size))
+ break;
+
+ ret = -EINVAL;
+ if (config.length == 0 ||
+ config.length > dev->config_size - config.offset)
+ break;
+
+ ret = -EFAULT;
+ if (copy_from_user(dev->config + config.offset, argp + size,
+ config.length))
+ break;
+
+ ret = 0;
+ break;
+ }
+ case VDUSE_DEV_INJECT_CONFIG_IRQ:
+ ret = 0;
+ queue_work(vduse_irq_wq, &dev->inject);
+ break;
+ case VDUSE_VQ_SETUP: {
+ struct vduse_vq_config config;
+ u32 index;
+
+ ret = -EFAULT;
+ if (copy_from_user(&config, argp, sizeof(config)))
+ break;
+
+ ret = -EINVAL;
+ if (config.index >= dev->vq_num)
+ break;
+
+ if (!is_mem_zero((const char *)config.reserved,
+ sizeof(config.reserved)))
+ break;
+
+ index = array_index_nospec(config.index, dev->vq_num);
+ dev->vqs[index].num_max = config.max_size;
+ ret = 0;
+ break;
+ }
+ case VDUSE_VQ_GET_INFO: {
+ struct vduse_vq_info vq_info;
+ struct vduse_virtqueue *vq;
+ u32 index;
+
+ ret = -EFAULT;
+ if (copy_from_user(&vq_info, argp, sizeof(vq_info)))
+ break;
+
+ ret = -EINVAL;
+ if (vq_info.index >= dev->vq_num)
+ break;
+
+ index = array_index_nospec(vq_info.index, dev->vq_num);
+ vq = &dev->vqs[index];
+ vq_info.desc_addr = vq->desc_addr;
+ vq_info.driver_addr = vq->driver_addr;
+ vq_info.device_addr = vq->device_addr;
+ vq_info.num = vq->num;
+
+ if (dev->driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
+ vq_info.packed.last_avail_counter =
+ vq->state.packed.last_avail_counter;
+ vq_info.packed.last_avail_idx =
+ vq->state.packed.last_avail_idx;
+ vq_info.packed.last_used_counter =
+ vq->state.packed.last_used_counter;
+ vq_info.packed.last_used_idx =
+ vq->state.packed.last_used_idx;
+ } else
+ vq_info.split.avail_index =
+ vq->state.split.avail_index;
+
+ vq_info.ready = vq->ready;
+
+ ret = -EFAULT;
+ if (copy_to_user(argp, &vq_info, sizeof(vq_info)))
+ break;
+
+ ret = 0;
+ break;
+ }
+ case VDUSE_VQ_SETUP_KICKFD: {
+ struct vduse_vq_eventfd eventfd;
+
+ ret = -EFAULT;
+ if (copy_from_user(&eventfd, argp, sizeof(eventfd)))
+ break;
+
+ ret = vduse_kickfd_setup(dev, &eventfd);
+ break;
+ }
+ case VDUSE_VQ_INJECT_IRQ: {
+ u32 index;
+
+ ret = -EFAULT;
+ if (get_user(index, (u32 __user *)argp))
+ break;
+
+ ret = -EINVAL;
+ if (index >= dev->vq_num)
+ break;
+
+ ret = 0;
+ index = array_index_nospec(index, dev->vq_num);
+ queue_work(vduse_irq_wq, &dev->vqs[index].inject);
+ break;
+ }
+ default:
+ ret = -ENOIOCTLCMD;
+ break;
+ }
+
+ return ret;
+ }
+
+ static int vduse_dev_release(struct inode *inode, struct file *file)
+ {
+ struct vduse_dev *dev = file->private_data;
+
+ spin_lock(&dev->msg_lock);
+ /* Make sure the inflight messages can processed after reconncection */
+ list_splice_init(&dev->recv_list, &dev->send_list);
+ spin_unlock(&dev->msg_lock);
+ dev->connected = false;
+
+ return 0;
+ }
+
+ static struct vduse_dev *vduse_dev_get_from_minor(int minor)
+ {
+ struct vduse_dev *dev;
+
+ mutex_lock(&vduse_lock);
+ dev = idr_find(&vduse_idr, minor);
+ mutex_unlock(&vduse_lock);
+
+ return dev;
+ }
+
+ static int vduse_dev_open(struct inode *inode, struct file *file)
+ {
+ int ret;
+ struct vduse_dev *dev = vduse_dev_get_from_minor(iminor(inode));
+
+ if (!dev)
+ return -ENODEV;
+
+ ret = -EBUSY;
+ mutex_lock(&dev->lock);
+ if (dev->connected)
+ goto unlock;
+
+ ret = 0;
+ dev->connected = true;
+ file->private_data = dev;
+ unlock:
+ mutex_unlock(&dev->lock);
+
+ return ret;
+ }
+
+ static const struct file_operations vduse_dev_fops = {
+ .owner = THIS_MODULE,
+ .open = vduse_dev_open,
+ .release = vduse_dev_release,
+ .read_iter = vduse_dev_read_iter,
+ .write_iter = vduse_dev_write_iter,
+ .poll = vduse_dev_poll,
+ .unlocked_ioctl = vduse_dev_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .llseek = noop_llseek,
+ };
+
+ static struct vduse_dev *vduse_dev_create(void)
+ {
+ struct vduse_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+
+ if (!dev)
+ return NULL;
+
+ mutex_init(&dev->lock);
+ spin_lock_init(&dev->msg_lock);
+ INIT_LIST_HEAD(&dev->send_list);
+ INIT_LIST_HEAD(&dev->recv_list);
+ spin_lock_init(&dev->irq_lock);
+
+ INIT_WORK(&dev->inject, vduse_dev_irq_inject);
+ init_waitqueue_head(&dev->waitq);
+
+ return dev;
+ }
+
+ static void vduse_dev_destroy(struct vduse_dev *dev)
+ {
+ kfree(dev);
+ }
+
+ static struct vduse_dev *vduse_find_dev(const char *name)
+ {
+ struct vduse_dev *dev;
+ int id;
+
+ idr_for_each_entry(&vduse_idr, dev, id)
+ if (!strcmp(dev->name, name))
+ return dev;
+
+ return NULL;
+ }
+
+ static int vduse_destroy_dev(char *name)
+ {
+ struct vduse_dev *dev = vduse_find_dev(name);
+
+ if (!dev)
+ return -EINVAL;
+
+ mutex_lock(&dev->lock);
+ if (dev->vdev || dev->connected) {
+ mutex_unlock(&dev->lock);
+ return -EBUSY;
+ }
+ dev->connected = true;
+ mutex_unlock(&dev->lock);
+
+ vduse_dev_reset(dev);
+ device_destroy(vduse_class, MKDEV(MAJOR(vduse_major), dev->minor));
+ idr_remove(&vduse_idr, dev->minor);
+ kvfree(dev->config);
+ kfree(dev->vqs);
+ vduse_domain_destroy(dev->domain);
+ kfree(dev->name);
+ vduse_dev_destroy(dev);
+ module_put(THIS_MODULE);
+
+ return 0;
+ }
+
+ static bool device_is_allowed(u32 device_id)
+ {
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(allowed_device_id); i++)
+ if (allowed_device_id[i] == device_id)
+ return true;
+
+ return false;
+ }
+
+ static bool features_is_valid(u64 features)
+ {
+ if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
+ return false;
+
+ /* Now we only support read-only configuration space */
+ if (features & (1ULL << VIRTIO_BLK_F_CONFIG_WCE))
+ return false;
+
+ return true;
+ }
+
+ static bool vduse_validate_config(struct vduse_dev_config *config)
+ {
+ if (!is_mem_zero((const char *)config->reserved,
+ sizeof(config->reserved)))
+ return false;
+
+ if (config->vq_align > PAGE_SIZE)
+ return false;
+
+ if (config->config_size > PAGE_SIZE)
+ return false;
+
+ if (!device_is_allowed(config->device_id))
+ return false;
+
+ if (!features_is_valid(config->features))
+ return false;
+
+ return true;
+ }
+
+ static ssize_t msg_timeout_show(struct device *device,
+ struct device_attribute *attr, char *buf)
+ {
+ struct vduse_dev *dev = dev_get_drvdata(device);
+
+ return sysfs_emit(buf, "%u\n", dev->msg_timeout);
+ }
+
+ static ssize_t msg_timeout_store(struct device *device,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+ {
+ struct vduse_dev *dev = dev_get_drvdata(device);
+ int ret;
+
+ ret = kstrtouint(buf, 10, &dev->msg_timeout);
+ if (ret < 0)
+ return ret;
+
+ return count;
+ }
+
+ static DEVICE_ATTR_RW(msg_timeout);
+
+ static struct attribute *vduse_dev_attrs[] = {
+ &dev_attr_msg_timeout.attr,
+ NULL
+ };
+
+ ATTRIBUTE_GROUPS(vduse_dev);
+
+ static int vduse_create_dev(struct vduse_dev_config *config,
+ void *config_buf, u64 api_version)
+ {
+ int i, ret;
+ struct vduse_dev *dev;
+
+ ret = -EEXIST;
+ if (vduse_find_dev(config->name))
+ goto err;
+
+ ret = -ENOMEM;
+ dev = vduse_dev_create();
+ if (!dev)
+ goto err;
+
+ dev->api_version = api_version;
+ dev->device_features = config->features;
+ dev->device_id = config->device_id;
+ dev->vendor_id = config->vendor_id;
+ dev->name = kstrdup(config->name, GFP_KERNEL);
+ if (!dev->name)
+ goto err_str;
+
+ dev->domain = vduse_domain_create(VDUSE_IOVA_SIZE - 1,
+ VDUSE_BOUNCE_SIZE);
+ if (!dev->domain)
+ goto err_domain;
+
+ dev->config = config_buf;
+ dev->config_size = config->config_size;
+ dev->vq_align = config->vq_align;
+ dev->vq_num = config->vq_num;
+ dev->vqs = kcalloc(dev->vq_num, sizeof(*dev->vqs), GFP_KERNEL);
+ if (!dev->vqs)
+ goto err_vqs;
+
+ for (i = 0; i < dev->vq_num; i++) {
+ dev->vqs[i].index = i;
+ INIT_WORK(&dev->vqs[i].inject, vduse_vq_irq_inject);
+ INIT_WORK(&dev->vqs[i].kick, vduse_vq_kick_work);
+ spin_lock_init(&dev->vqs[i].kick_lock);
+ spin_lock_init(&dev->vqs[i].irq_lock);
+ }
+
+ ret = idr_alloc(&vduse_idr, dev, 1, VDUSE_DEV_MAX, GFP_KERNEL);
+ if (ret < 0)
+ goto err_idr;
+
+ dev->minor = ret;
+ dev->msg_timeout = VDUSE_MSG_DEFAULT_TIMEOUT;
+ dev->dev = device_create(vduse_class, NULL,
+ MKDEV(MAJOR(vduse_major), dev->minor),
+ dev, "%s", config->name);
+ if (IS_ERR(dev->dev)) {
+ ret = PTR_ERR(dev->dev);
+ goto err_dev;
+ }
+ __module_get(THIS_MODULE);
+
+ return 0;
+ err_dev:
+ idr_remove(&vduse_idr, dev->minor);
+ err_idr:
+ kfree(dev->vqs);
+ err_vqs:
+ vduse_domain_destroy(dev->domain);
+ err_domain:
+ kfree(dev->name);
+ err_str:
+ vduse_dev_destroy(dev);
+ err:
+ kvfree(config_buf);
+ return ret;
+ }
+
+ static long vduse_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+ {
+ int ret;
+ void __user *argp = (void __user *)arg;
+ struct vduse_control *control = file->private_data;
+
+ mutex_lock(&vduse_lock);
+ switch (cmd) {
+ case VDUSE_GET_API_VERSION:
+ ret = put_user(control->api_version, (u64 __user *)argp);
+ break;
+ case VDUSE_SET_API_VERSION: {
+ u64 api_version;
+
+ ret = -EFAULT;
+ if (get_user(api_version, (u64 __user *)argp))
+ break;
+
+ ret = -EINVAL;
+ if (api_version > VDUSE_API_VERSION)
+ break;
+
+ ret = 0;
+ control->api_version = api_version;
+ break;
+ }
+ case VDUSE_CREATE_DEV: {
+ struct vduse_dev_config config;
+ unsigned long size = offsetof(struct vduse_dev_config, config);
+ void *buf;
+
+ ret = -EFAULT;
+ if (copy_from_user(&config, argp, size))
+ break;
+
+ ret = -EINVAL;
+ if (vduse_validate_config(&config) == false)
+ break;
+
+ buf = vmemdup_user(argp + size, config.config_size);
+ if (IS_ERR(buf)) {
+ ret = PTR_ERR(buf);
+ break;
+ }
+ config.name[VDUSE_NAME_MAX - 1] = '\0';
+ ret = vduse_create_dev(&config, buf, control->api_version);
+ break;
+ }
+ case VDUSE_DESTROY_DEV: {
+ char name[VDUSE_NAME_MAX];
+
+ ret = -EFAULT;
+ if (copy_from_user(name, argp, VDUSE_NAME_MAX))
+ break;
+
+ name[VDUSE_NAME_MAX - 1] = '\0';
+ ret = vduse_destroy_dev(name);
+ break;
+ }
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ mutex_unlock(&vduse_lock);
+
+ return ret;
+ }
+
+ static int vduse_release(struct inode *inode, struct file *file)
+ {
+ struct vduse_control *control = file->private_data;
+
+ kfree(control);
+ return 0;
+ }
+
+ static int vduse_open(struct inode *inode, struct file *file)
+ {
+ struct vduse_control *control;
+
+ control = kmalloc(sizeof(struct vduse_control), GFP_KERNEL);
+ if (!control)
+ return -ENOMEM;
+
+ control->api_version = VDUSE_API_VERSION;
+ file->private_data = control;
+
+ return 0;
+ }
+
+ static const struct file_operations vduse_ctrl_fops = {
+ .owner = THIS_MODULE,
+ .open = vduse_open,
+ .release = vduse_release,
+ .unlocked_ioctl = vduse_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .llseek = noop_llseek,
+ };
+
+ static char *vduse_devnode(struct device *dev, umode_t *mode)
+ {
+ return kasprintf(GFP_KERNEL, "vduse/%s", dev_name(dev));
+ }
+
+ static void vduse_mgmtdev_release(struct device *dev)
+ {
+ }
+
+ static struct device vduse_mgmtdev = {
+ .init_name = "vduse",
+ .release = vduse_mgmtdev_release,
+ };
+
+ static struct vdpa_mgmt_dev mgmt_dev;
+
+ static int vduse_dev_init_vdpa(struct vduse_dev *dev, const char *name)
+ {
+ struct vduse_vdpa *vdev;
+ int ret;
+
+ if (dev->vdev)
+ return -EEXIST;
+
+ vdev = vdpa_alloc_device(struct vduse_vdpa, vdpa, dev->dev,
+ &vduse_vdpa_config_ops, name, true);
+ if (IS_ERR(vdev))
+ return PTR_ERR(vdev);
+
+ dev->vdev = vdev;
+ vdev->dev = dev;
+ vdev->vdpa.dev.dma_mask = &vdev->vdpa.dev.coherent_dma_mask;
+ ret = dma_set_mask_and_coherent(&vdev->vdpa.dev, DMA_BIT_MASK(64));
+ if (ret) {
+ put_device(&vdev->vdpa.dev);
+ return ret;
+ }
+ set_dma_ops(&vdev->vdpa.dev, &vduse_dev_dma_ops);
+ vdev->vdpa.dma_dev = &vdev->vdpa.dev;
+ vdev->vdpa.mdev = &mgmt_dev;
+
+ return 0;
+ }
+
+ static int vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name)
+ {
+ struct vduse_dev *dev;
+ int ret;
+
+ mutex_lock(&vduse_lock);
+ dev = vduse_find_dev(name);
+ if (!dev || !vduse_dev_is_ready(dev)) {
+ mutex_unlock(&vduse_lock);
+ return -EINVAL;
+ }
+ ret = vduse_dev_init_vdpa(dev, name);
+ mutex_unlock(&vduse_lock);
+ if (ret)
+ return ret;
+
+ ret = _vdpa_register_device(&dev->vdev->vdpa, dev->vq_num);
+ if (ret) {
+ put_device(&dev->vdev->vdpa.dev);
+ return ret;
+ }
+
+ return 0;
+ }
+
+ static void vdpa_dev_del(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev)
+ {
+ _vdpa_unregister_device(dev);
+ }
+
+ static const struct vdpa_mgmtdev_ops vdpa_dev_mgmtdev_ops = {
+ .dev_add = vdpa_dev_add,
+ .dev_del = vdpa_dev_del,
+ };
+
+ static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
+ { 0 },
+ };
+
+ static struct vdpa_mgmt_dev mgmt_dev = {
+ .device = &vduse_mgmtdev,
+ .id_table = id_table,
+ .ops = &vdpa_dev_mgmtdev_ops,
+ };
+
+ static int vduse_mgmtdev_init(void)
+ {
+ int ret;
+
+ ret = device_register(&vduse_mgmtdev);
+ if (ret)
+ return ret;
+
+ ret = vdpa_mgmtdev_register(&mgmt_dev);
+ if (ret)
+ goto err;
+
+ return 0;
+ err:
+ device_unregister(&vduse_mgmtdev);
+ return ret;
+ }
+
+ static void vduse_mgmtdev_exit(void)
+ {
+ vdpa_mgmtdev_unregister(&mgmt_dev);
+ device_unregister(&vduse_mgmtdev);
+ }
+
+ static int vduse_init(void)
+ {
+ int ret;
+ struct device *dev;
+
+ vduse_class = class_create(THIS_MODULE, "vduse");
+ if (IS_ERR(vduse_class))
+ return PTR_ERR(vduse_class);
+
+ vduse_class->devnode = vduse_devnode;
+ vduse_class->dev_groups = vduse_dev_groups;
+
+ ret = alloc_chrdev_region(&vduse_major, 0, VDUSE_DEV_MAX, "vduse");
+ if (ret)
+ goto err_chardev_region;
+
+ /* /dev/vduse/control */
+ cdev_init(&vduse_ctrl_cdev, &vduse_ctrl_fops);
+ vduse_ctrl_cdev.owner = THIS_MODULE;
+ ret = cdev_add(&vduse_ctrl_cdev, vduse_major, 1);
+ if (ret)
+ goto err_ctrl_cdev;
+
+ dev = device_create(vduse_class, NULL, vduse_major, NULL, "control");
+ if (IS_ERR(dev)) {
+ ret = PTR_ERR(dev);
+ goto err_device;
+ }
+
+ /* /dev/vduse/$DEVICE */
+ cdev_init(&vduse_cdev, &vduse_dev_fops);
+ vduse_cdev.owner = THIS_MODULE;
+ ret = cdev_add(&vduse_cdev, MKDEV(MAJOR(vduse_major), 1),
+ VDUSE_DEV_MAX - 1);
+ if (ret)
+ goto err_cdev;
+
+ vduse_irq_wq = alloc_workqueue("vduse-irq",
+ WQ_HIGHPRI | WQ_SYSFS | WQ_UNBOUND, 0);
+ if (!vduse_irq_wq)
+ goto err_wq;
+
+ ret = vduse_domain_init();
+ if (ret)
+ goto err_domain;
+
+ ret = vduse_mgmtdev_init();
+ if (ret)
+ goto err_mgmtdev;
+
+ return 0;
+ err_mgmtdev:
+ vduse_domain_exit();
+ err_domain:
+ destroy_workqueue(vduse_irq_wq);
+ err_wq:
+ cdev_del(&vduse_cdev);
+ err_cdev:
+ device_destroy(vduse_class, vduse_major);
+ err_device:
+ cdev_del(&vduse_ctrl_cdev);
+ err_ctrl_cdev:
+ unregister_chrdev_region(vduse_major, VDUSE_DEV_MAX);
+ err_chardev_region:
+ class_destroy(vduse_class);
+ return ret;
+ }
+ module_init(vduse_init);
+
+ static void vduse_exit(void)
+ {
+ vduse_mgmtdev_exit();
+ vduse_domain_exit();
+ destroy_workqueue(vduse_irq_wq);
+ cdev_del(&vduse_cdev);
+ device_destroy(vduse_class, vduse_major);
+ cdev_del(&vduse_ctrl_cdev);
+ unregister_chrdev_region(vduse_major, VDUSE_DEV_MAX);
+ class_destroy(vduse_class);
+ }
+ module_exit(vduse_exit);
+
+ MODULE_LICENSE(DRV_LICENSE);
+ MODULE_AUTHOR(DRV_AUTHOR);
+ MODULE_DESCRIPTION(DRV_DESC);
projects / linux-2.6-microblaze.git / commitdiff