mirror of https://gitee.com/openkylin/linux.git
IB/mlx5: Implement DEVX dispatching event
Implement DEVX dispatching event by looking up for the applicable subscriptions for the reported event and using their target fd to signal/set the event. Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Reviewed-by: Jason Gunthorpe <jgg@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Yishai Hadas
Jason Gunthorpe
parent
7597385371
commit
5ec9d8ee87
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@ -34,6 +34,11 @@ struct devx_async_data {
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struct mlx5_ib_uapi_devx_async_cmd_hdr hdr;
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};
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struct devx_async_event_data {
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struct list_head list; /* headed in ev_file->event_list */
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struct mlx5_ib_uapi_devx_async_event_hdr hdr;
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};
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/* first level XA value data structure */
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struct devx_event {
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struct xarray object_ids; /* second XA level, Key = object id */
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@ -77,6 +82,8 @@ struct devx_async_event_file {
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struct list_head event_list;
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struct mlx5_ib_dev *dev;
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u8 omit_data:1;
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u8 is_overflow_err:1;
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u8 is_destroyed:1;
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};
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#define MLX5_MAX_DESTROY_INBOX_SIZE_DW MLX5_ST_SZ_DW(delete_fte_in)
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@ -289,6 +296,29 @@ static u16 get_dec_obj_type(struct devx_obj *obj, u16 event_num)
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}
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}
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static u16 get_event_obj_type(unsigned long event_type, struct mlx5_eqe *eqe)
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{
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switch (event_type) {
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case MLX5_EVENT_TYPE_WQ_CATAS_ERROR:
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case MLX5_EVENT_TYPE_WQ_ACCESS_ERROR:
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case MLX5_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
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case MLX5_EVENT_TYPE_SRQ_LAST_WQE:
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case MLX5_EVENT_TYPE_PATH_MIG:
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case MLX5_EVENT_TYPE_PATH_MIG_FAILED:
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case MLX5_EVENT_TYPE_COMM_EST:
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case MLX5_EVENT_TYPE_SQ_DRAINED:
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case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
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case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
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return eqe->data.qp_srq.type;
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case MLX5_EVENT_TYPE_CQ_ERROR:
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return 0;
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case MLX5_EVENT_TYPE_DCT_DRAINED:
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return MLX5_EVENT_QUEUE_TYPE_DCT;
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default:
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return MLX5_GET(affiliated_event_header, &eqe->data, obj_type);
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}
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}
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static u32 get_dec_obj_id(u64 obj_id)
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{
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return (obj_id & 0xffffffff);
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@ -2161,12 +2191,172 @@ static int devx_umem_cleanup(struct ib_uobject *uobject,
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return 0;
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}
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static bool is_unaffiliated_event(struct mlx5_core_dev *dev,
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unsigned long event_type)
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{
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__be64 *unaff_events;
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int mask_entry;
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int mask_bit;
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if (!MLX5_CAP_GEN(dev, event_cap))
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return is_legacy_unaffiliated_event_num(event_type);
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unaff_events = MLX5_CAP_DEV_EVENT(dev,
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user_unaffiliated_events);
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WARN_ON(event_type > MAX_SUPP_EVENT_NUM);
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mask_entry = event_type / 64;
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mask_bit = event_type % 64;
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if (!(be64_to_cpu(unaff_events[mask_entry]) & (1ull << mask_bit)))
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return false;
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return true;
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}
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static u32 devx_get_obj_id_from_event(unsigned long event_type, void *data)
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{
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struct mlx5_eqe *eqe = data;
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u32 obj_id = 0;
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switch (event_type) {
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case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR:
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case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT:
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case MLX5_EVENT_TYPE_PATH_MIG:
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case MLX5_EVENT_TYPE_COMM_EST:
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case MLX5_EVENT_TYPE_SQ_DRAINED:
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case MLX5_EVENT_TYPE_SRQ_LAST_WQE:
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case MLX5_EVENT_TYPE_WQ_CATAS_ERROR:
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case MLX5_EVENT_TYPE_PATH_MIG_FAILED:
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case MLX5_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
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case MLX5_EVENT_TYPE_WQ_ACCESS_ERROR:
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obj_id = be32_to_cpu(eqe->data.qp_srq.qp_srq_n) & 0xffffff;
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break;
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case MLX5_EVENT_TYPE_DCT_DRAINED:
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obj_id = be32_to_cpu(eqe->data.dct.dctn) & 0xffffff;
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break;
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case MLX5_EVENT_TYPE_CQ_ERROR:
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obj_id = be32_to_cpu(eqe->data.cq_err.cqn) & 0xffffff;
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break;
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default:
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obj_id = MLX5_GET(affiliated_event_header, &eqe->data, obj_id);
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break;
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}
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return obj_id;
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}
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static int deliver_event(struct devx_event_subscription *event_sub,
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const void *data)
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{
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struct devx_async_event_file *ev_file;
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struct devx_async_event_data *event_data;
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unsigned long flags;
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ev_file = event_sub->ev_file;
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if (ev_file->omit_data) {
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spin_lock_irqsave(&ev_file->lock, flags);
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if (!list_empty(&event_sub->event_list)) {
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spin_unlock_irqrestore(&ev_file->lock, flags);
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return 0;
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}
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list_add_tail(&event_sub->event_list, &ev_file->event_list);
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spin_unlock_irqrestore(&ev_file->lock, flags);
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wake_up_interruptible(&ev_file->poll_wait);
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return 0;
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}
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event_data = kzalloc(sizeof(*event_data) + sizeof(struct mlx5_eqe),
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GFP_ATOMIC);
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if (!event_data) {
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spin_lock_irqsave(&ev_file->lock, flags);
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ev_file->is_overflow_err = 1;
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spin_unlock_irqrestore(&ev_file->lock, flags);
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return -ENOMEM;
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}
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event_data->hdr.cookie = event_sub->cookie;
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memcpy(event_data->hdr.out_data, data, sizeof(struct mlx5_eqe));
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spin_lock_irqsave(&ev_file->lock, flags);
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list_add_tail(&event_data->list, &ev_file->event_list);
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spin_unlock_irqrestore(&ev_file->lock, flags);
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wake_up_interruptible(&ev_file->poll_wait);
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return 0;
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}
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static void dispatch_event_fd(struct list_head *fd_list,
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const void *data)
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{
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struct devx_event_subscription *item;
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list_for_each_entry_rcu(item, fd_list, xa_list) {
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if (!get_file_rcu(item->filp))
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continue;
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if (item->eventfd) {
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eventfd_signal(item->eventfd, 1);
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fput(item->filp);
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continue;
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}
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deliver_event(item, data);
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fput(item->filp);
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}
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}
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static int devx_event_notifier(struct notifier_block *nb,
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unsigned long event_type, void *data)
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{
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struct mlx5_devx_event_table *table;
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struct mlx5_ib_dev *dev;
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struct devx_event *event;
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struct devx_obj_event *obj_event;
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u16 obj_type = 0;
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bool is_unaffiliated;
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u32 obj_id;
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/* Explicit filtering to kernel events which may occur frequently */
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if (event_type == MLX5_EVENT_TYPE_CMD ||
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event_type == MLX5_EVENT_TYPE_PAGE_REQUEST)
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return NOTIFY_OK;
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table = container_of(nb, struct mlx5_devx_event_table, devx_nb.nb);
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dev = container_of(table, struct mlx5_ib_dev, devx_event_table);
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is_unaffiliated = is_unaffiliated_event(dev->mdev, event_type);
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if (!is_unaffiliated)
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obj_type = get_event_obj_type(event_type, data);
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rcu_read_lock();
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event = xa_load(&table->event_xa, event_type | (obj_type << 16));
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if (!event) {
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rcu_read_unlock();
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return NOTIFY_DONE;
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}
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if (is_unaffiliated) {
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dispatch_event_fd(&event->unaffiliated_list, data);
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rcu_read_unlock();
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return NOTIFY_OK;
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}
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obj_id = devx_get_obj_id_from_event(event_type, data);
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obj_event = xa_load(&event->object_ids, obj_id);
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if (!obj_event) {
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rcu_read_unlock();
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return NOTIFY_DONE;
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}
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dispatch_event_fd(&obj_event->obj_sub_list, data);
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rcu_read_unlock();
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return NOTIFY_OK;
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}
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void mlx5_ib_devx_init_event_table(struct mlx5_ib_dev *dev)
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{
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struct mlx5_devx_event_table *table = &dev->devx_event_table;
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@ -2299,19 +2489,108 @@ static const struct file_operations devx_async_cmd_event_fops = {
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static ssize_t devx_async_event_read(struct file *filp, char __user *buf,
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size_t count, loff_t *pos)
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{
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struct devx_async_event_file *ev_file = filp->private_data;
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struct devx_event_subscription *event_sub;
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struct devx_async_event_data *uninitialized_var(event);
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int ret = 0;
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size_t eventsz;
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bool omit_data;
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void *event_data;
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omit_data = ev_file->omit_data;
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spin_lock_irq(&ev_file->lock);
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if (ev_file->is_overflow_err) {
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ev_file->is_overflow_err = 0;
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spin_unlock_irq(&ev_file->lock);
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return -EOVERFLOW;
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}
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if (ev_file->is_destroyed) {
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spin_unlock_irq(&ev_file->lock);
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return -EIO;
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}
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while (list_empty(&ev_file->event_list)) {
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spin_unlock_irq(&ev_file->lock);
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if (filp->f_flags & O_NONBLOCK)
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return -EAGAIN;
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if (wait_event_interruptible(ev_file->poll_wait,
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(!list_empty(&ev_file->event_list) ||
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ev_file->is_destroyed))) {
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return -ERESTARTSYS;
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}
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spin_lock_irq(&ev_file->lock);
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if (ev_file->is_destroyed) {
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spin_unlock_irq(&ev_file->lock);
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return -EIO;
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}
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}
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if (omit_data) {
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event_sub = list_first_entry(&ev_file->event_list,
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struct devx_event_subscription,
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event_list);
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eventsz = sizeof(event_sub->cookie);
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event_data = &event_sub->cookie;
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} else {
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event = list_first_entry(&ev_file->event_list,
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struct devx_async_event_data, list);
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eventsz = sizeof(struct mlx5_eqe) +
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sizeof(struct mlx5_ib_uapi_devx_async_event_hdr);
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event_data = &event->hdr;
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}
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if (eventsz > count) {
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spin_unlock_irq(&ev_file->lock);
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return -EINVAL;
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}
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if (omit_data)
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list_del_init(&event_sub->event_list);
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else
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list_del(&event->list);
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spin_unlock_irq(&ev_file->lock);
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if (copy_to_user(buf, event_data, eventsz))
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/* This points to an application issue, not a kernel concern */
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ret = -EFAULT;
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else
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ret = eventsz;
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if (!omit_data)
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kfree(event);
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return ret;
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}
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static __poll_t devx_async_event_poll(struct file *filp,
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struct poll_table_struct *wait)
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{
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return 0;
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struct devx_async_event_file *ev_file = filp->private_data;
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__poll_t pollflags = 0;
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poll_wait(filp, &ev_file->poll_wait, wait);
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spin_lock_irq(&ev_file->lock);
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if (ev_file->is_destroyed)
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pollflags = EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
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else if (!list_empty(&ev_file->event_list))
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pollflags = EPOLLIN | EPOLLRDNORM;
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spin_unlock_irq(&ev_file->lock);
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return pollflags;
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}
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static int devx_async_event_close(struct inode *inode, struct file *filp)
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{
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struct devx_async_event_file *ev_file = filp->private_data;
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struct devx_event_subscription *event_sub, *event_sub_tmp;
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struct devx_async_event_data *entry, *tmp;
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mutex_lock(&ev_file->dev->devx_event_table.event_xa_lock);
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/* delete the subscriptions which are related to this FD */
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@ -2328,6 +2607,15 @@ static int devx_async_event_close(struct inode *inode, struct file *filp)
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mutex_unlock(&ev_file->dev->devx_event_table.event_xa_lock);
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/* free the pending events allocation */
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if (!ev_file->omit_data) {
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spin_lock_irq(&ev_file->lock);
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list_for_each_entry_safe(entry, tmp,
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&ev_file->event_list, list)
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kfree(entry); /* read can't come any more */
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spin_unlock_irq(&ev_file->lock);
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}
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uverbs_close_fd(filp);
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put_device(&ev_file->dev->ib_dev.dev);
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return 0;
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@ -2363,6 +2651,15 @@ static int devx_hot_unplug_async_cmd_event_file(struct ib_uobject *uobj,
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static int devx_hot_unplug_async_event_file(struct ib_uobject *uobj,
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enum rdma_remove_reason why)
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{
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struct devx_async_event_file *ev_file =
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container_of(uobj, struct devx_async_event_file,
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uobj);
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spin_lock_irq(&ev_file->lock);
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ev_file->is_destroyed = 1;
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spin_unlock_irq(&ev_file->lock);
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wake_up_interruptible(&ev_file->poll_wait);
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return 0;
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};
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@ -67,5 +67,10 @@ enum mlx5_ib_uapi_devx_create_event_channel_flags {
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MLX5_IB_UAPI_DEVX_CR_EV_CH_FLAGS_OMIT_DATA = 1 << 0,
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};
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struct mlx5_ib_uapi_devx_async_event_hdr {
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__aligned_u64 cookie;
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__u8 out_data[];
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};
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#endif
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