diff options
Diffstat (limited to 'drivers/vhost/vhost.h')
| -rw-r--r-- | drivers/vhost/vhost.h | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 11ee13dba0f7..3693327549b3 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -5,13 +5,13 @@ #include <linux/vhost.h> #include <linux/mm.h> #include <linux/mutex.h> -#include <linux/workqueue.h> #include <linux/poll.h> #include <linux/file.h> #include <linux/skbuff.h> #include <linux/uio.h> #include <linux/virtio_config.h> #include <linux/virtio_ring.h> +#include <asm/atomic.h> struct vhost_device; @@ -20,19 +20,31 @@ enum { VHOST_NET_MAX_SG = MAX_SKB_FRAGS + 2, }; +struct vhost_work; +typedef void (*vhost_work_fn_t)(struct vhost_work *work); + +struct vhost_work { + struct list_head node; + vhost_work_fn_t fn; + wait_queue_head_t done; + int flushing; + unsigned queue_seq; + unsigned done_seq; +}; + /* Poll a file (eventfd or socket) */ /* Note: there's nothing vhost specific about this structure. */ struct vhost_poll { poll_table table; wait_queue_head_t *wqh; wait_queue_t wait; - /* struct which will handle all actual work. */ - struct work_struct work; + struct vhost_work work; unsigned long mask; + struct vhost_dev *dev; }; -void vhost_poll_init(struct vhost_poll *poll, work_func_t func, - unsigned long mask); +void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn, + unsigned long mask, struct vhost_dev *dev); void vhost_poll_start(struct vhost_poll *poll, struct file *file); void vhost_poll_stop(struct vhost_poll *poll); void vhost_poll_flush(struct vhost_poll *poll); @@ -63,7 +75,7 @@ struct vhost_virtqueue { struct vhost_poll poll; /* The routine to call when the Guest pings us, or timeout. */ - work_func_t handle_kick; + vhost_work_fn_t handle_kick; /* Last available index we saw. */ u16 last_avail_idx; @@ -86,11 +98,11 @@ struct vhost_virtqueue { struct iovec hdr[VHOST_NET_MAX_SG]; size_t hdr_size; /* We use a kind of RCU to access private pointer. - * All readers access it from workqueue, which makes it possible to - * flush the workqueue instead of synchronize_rcu. Therefore readers do + * All readers access it from worker, which makes it possible to + * flush the vhost_work instead of synchronize_rcu. Therefore readers do * not need to call rcu_read_lock/rcu_read_unlock: the beginning of - * work item execution acts instead of rcu_read_lock() and the end of - * work item execution acts instead of rcu_read_lock(). + * vhost_work execution acts instead of rcu_read_lock() and the end of + * vhost_work execution acts instead of rcu_read_lock(). * Writers use virtqueue mutex. */ void *private_data; /* Log write descriptors */ @@ -110,6 +122,9 @@ struct vhost_dev { int nvqs; struct file *log_file; struct eventfd_ctx *log_ctx; + spinlock_t work_lock; + struct list_head work_list; + struct task_struct *worker; }; long vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue *vqs, int nvqs); @@ -136,9 +151,6 @@ bool vhost_enable_notify(struct vhost_virtqueue *); int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, unsigned int log_num, u64 len); -int vhost_init(void); -void vhost_cleanup(void); - #define vq_err(vq, fmt, ...) do { \ pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \ if ((vq)->error_ctx) \ |