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)                               \