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1 | #ifndef _VHOST_H |
2 | #define _VHOST_H |
3 | |
4 | #include <linux/eventfd.h> |
5 | #include <linux/vhost.h> |
6 | #include <linux/mm.h> |
7 | #include <linux/mutex.h> |
8 | #include <linux/poll.h> |
9 | #include <linux/file.h> |
10 | #include <linux/skbuff.h> |
11 | #include <linux/uio.h> |
12 | #include <linux/virtio_config.h> |
13 | #include <linux/virtio_ring.h> |
14 | #include <linux/atomic.h> |
15 | |
16 | /* This is for zerocopy, used buffer len is set to 1 when lower device DMA |
17 | * done */ |
18 | #define VHOST_DMA_DONE_LEN 1 |
19 | #define VHOST_DMA_CLEAR_LEN 0 |
20 | |
21 | struct vhost_device; |
22 | |
23 | struct vhost_work; |
24 | typedef void (*vhost_work_fn_t)(struct vhost_work *work); |
25 | |
26 | struct vhost_work { |
27 | struct list_head node; |
28 | vhost_work_fn_t fn; |
29 | wait_queue_head_t done; |
30 | int flushing; |
31 | unsigned queue_seq; |
32 | unsigned done_seq; |
33 | }; |
34 | |
35 | /* Poll a file (eventfd or socket) */ |
36 | /* Note: there's nothing vhost specific about this structure. */ |
37 | struct vhost_poll { |
38 | poll_table table; |
39 | wait_queue_head_t *wqh; |
40 | wait_queue_t wait; |
41 | struct vhost_work work; |
42 | unsigned long mask; |
43 | struct vhost_dev *dev; |
44 | }; |
45 | |
46 | void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn); |
47 | void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work); |
48 | |
49 | void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn, |
50 | unsigned long mask, struct vhost_dev *dev); |
51 | void vhost_poll_start(struct vhost_poll *poll, struct file *file); |
52 | void vhost_poll_stop(struct vhost_poll *poll); |
53 | void vhost_poll_flush(struct vhost_poll *poll); |
54 | void vhost_poll_queue(struct vhost_poll *poll); |
55 | |
56 | struct vhost_log { |
57 | u64 addr; |
58 | u64 len; |
59 | }; |
60 | |
61 | struct vhost_virtqueue; |
62 | |
63 | struct vhost_ubuf_ref { |
64 | struct kref kref; |
65 | wait_queue_head_t wait; |
66 | struct vhost_virtqueue *vq; |
67 | }; |
68 | |
69 | struct vhost_ubuf_ref *vhost_ubuf_alloc(struct vhost_virtqueue *, bool zcopy); |
70 | void vhost_ubuf_put(struct vhost_ubuf_ref *); |
71 | void vhost_ubuf_put_and_wait(struct vhost_ubuf_ref *); |
72 | |
73 | /* The virtqueue structure describes a queue attached to a device. */ |
74 | struct vhost_virtqueue { |
75 | struct vhost_dev *dev; |
76 | |
77 | /* The actual ring of buffers. */ |
78 | struct mutex mutex; |
79 | unsigned int num; |
80 | struct vring_desc __user *desc; |
81 | struct vring_avail __user *avail; |
82 | struct vring_used __user *used; |
83 | struct file *kick; |
84 | struct file *call; |
85 | struct file *error; |
86 | struct eventfd_ctx *call_ctx; |
87 | struct eventfd_ctx *error_ctx; |
88 | struct eventfd_ctx *log_ctx; |
89 | |
90 | struct vhost_poll poll; |
91 | |
92 | /* The routine to call when the Guest pings us, or timeout. */ |
93 | vhost_work_fn_t handle_kick; |
94 | |
95 | /* Last available index we saw. */ |
96 | u16 last_avail_idx; |
97 | |
98 | /* Caches available index value from user. */ |
99 | u16 avail_idx; |
100 | |
101 | /* Last index we used. */ |
102 | u16 last_used_idx; |
103 | |
104 | /* Used flags */ |
105 | u16 used_flags; |
106 | |
107 | /* Last used index value we have signalled on */ |
108 | u16 signalled_used; |
109 | |
110 | /* Last used index value we have signalled on */ |
111 | bool signalled_used_valid; |
112 | |
113 | /* Log writes to used structure. */ |
114 | bool log_used; |
115 | u64 log_addr; |
116 | |
117 | struct iovec iov[UIO_MAXIOV]; |
118 | /* hdr is used to store the virtio header. |
119 | * Since each iovec has >= 1 byte length, we never need more than |
120 | * header length entries to store the header. */ |
121 | struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)]; |
122 | struct iovec *indirect; |
123 | size_t vhost_hlen; |
124 | size_t sock_hlen; |
125 | struct vring_used_elem *heads; |
126 | /* We use a kind of RCU to access private pointer. |
127 | * All readers access it from worker, which makes it possible to |
128 | * flush the vhost_work instead of synchronize_rcu. Therefore readers do |
129 | * not need to call rcu_read_lock/rcu_read_unlock: the beginning of |
130 | * vhost_work execution acts instead of rcu_read_lock() and the end of |
131 | * vhost_work execution acts instead of rcu_read_unlock(). |
132 | * Writers use virtqueue mutex. */ |
133 | void __rcu *private_data; |
134 | /* Log write descriptors */ |
135 | void __user *log_base; |
136 | struct vhost_log *log; |
137 | /* vhost zerocopy support fields below: */ |
138 | /* last used idx for outstanding DMA zerocopy buffers */ |
139 | int upend_idx; |
140 | /* first used idx for DMA done zerocopy buffers */ |
141 | int done_idx; |
142 | /* an array of userspace buffers info */ |
143 | struct ubuf_info *ubuf_info; |
144 | /* Reference counting for outstanding ubufs. |
145 | * Protected by vq mutex. Writers must also take device mutex. */ |
146 | struct vhost_ubuf_ref *ubufs; |
147 | }; |
148 | |
149 | struct vhost_dev { |
150 | /* Readers use RCU to access memory table pointer |
151 | * log base pointer and features. |
152 | * Writers use mutex below.*/ |
153 | struct vhost_memory __rcu *memory; |
154 | struct mm_struct *mm; |
155 | struct mutex mutex; |
156 | unsigned acked_features; |
157 | struct vhost_virtqueue *vqs; |
158 | int nvqs; |
159 | struct file *log_file; |
160 | struct eventfd_ctx *log_ctx; |
161 | spinlock_t work_lock; |
162 | struct list_head work_list; |
163 | struct task_struct *worker; |
164 | }; |
165 | |
166 | long vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue *vqs, int nvqs); |
167 | long vhost_dev_check_owner(struct vhost_dev *); |
168 | long vhost_dev_reset_owner(struct vhost_dev *); |
169 | void vhost_dev_cleanup(struct vhost_dev *, bool locked); |
170 | long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, unsigned long arg); |
171 | int vhost_vq_access_ok(struct vhost_virtqueue *vq); |
172 | int vhost_log_access_ok(struct vhost_dev *); |
173 | |
174 | int vhost_get_vq_desc(struct vhost_dev *, struct vhost_virtqueue *, |
175 | struct iovec iov[], unsigned int iov_count, |
176 | unsigned int *out_num, unsigned int *in_num, |
177 | struct vhost_log *log, unsigned int *log_num); |
178 | void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); |
179 | |
180 | int vhost_init_used(struct vhost_virtqueue *); |
181 | int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len); |
182 | int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads, |
183 | unsigned count); |
184 | void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *, |
185 | unsigned int id, int len); |
186 | void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *, |
187 | struct vring_used_elem *heads, unsigned count); |
188 | void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *); |
189 | void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *); |
190 | bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *); |
191 | |
192 | int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, |
193 | unsigned int log_num, u64 len); |
194 | void vhost_zerocopy_callback(struct ubuf_info *); |
195 | int vhost_zerocopy_signal_used(struct vhost_virtqueue *vq); |
196 | |
197 | #define vq_err(vq, fmt, ...) do { \ |
198 | pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \ |
199 | if ((vq)->error_ctx) \ |
200 | eventfd_signal((vq)->error_ctx, 1);\ |
201 | } while (0) |
202 | |
203 | enum { |
204 | VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | |
205 | (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | |
206 | (1ULL << VIRTIO_RING_F_EVENT_IDX) | |
207 | (1ULL << VHOST_F_LOG_ALL), |
208 | VHOST_NET_FEATURES = VHOST_FEATURES | |
209 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | |
210 | (1ULL << VIRTIO_NET_F_MRG_RXBUF), |
211 | }; |
212 | |
213 | static inline int vhost_has_feature(struct vhost_dev *dev, int bit) |
214 | { |
215 | unsigned acked_features; |
216 | |
217 | /* TODO: check that we are running from vhost_worker or dev mutex is |
218 | * held? */ |
219 | acked_features = rcu_dereference_index_check(dev->acked_features, 1); |
220 | return acked_features & (1 << bit); |
221 | } |
222 | |
223 | void vhost_enable_zcopy(int vq); |
224 | |
225 | #endif |
226 |
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Tags:
od-2011-09-04
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v2.6.34-rc5
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