Root/
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/uio.h> |
11 | #include <linux/virtio_config.h> |
12 | #include <linux/virtio_ring.h> |
13 | #include <linux/atomic.h> |
14 | |
15 | struct vhost_device; |
16 | |
17 | struct vhost_work; |
18 | typedef void (*vhost_work_fn_t)(struct vhost_work *work); |
19 | |
20 | struct vhost_work { |
21 | struct list_head node; |
22 | vhost_work_fn_t fn; |
23 | wait_queue_head_t done; |
24 | int flushing; |
25 | unsigned queue_seq; |
26 | unsigned done_seq; |
27 | }; |
28 | |
29 | /* Poll a file (eventfd or socket) */ |
30 | /* Note: there's nothing vhost specific about this structure. */ |
31 | struct vhost_poll { |
32 | poll_table table; |
33 | wait_queue_head_t *wqh; |
34 | wait_queue_t wait; |
35 | struct vhost_work work; |
36 | unsigned long mask; |
37 | struct vhost_dev *dev; |
38 | }; |
39 | |
40 | void vhost_work_init(struct vhost_work *work, vhost_work_fn_t fn); |
41 | void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work); |
42 | |
43 | void vhost_poll_init(struct vhost_poll *poll, vhost_work_fn_t fn, |
44 | unsigned long mask, struct vhost_dev *dev); |
45 | int vhost_poll_start(struct vhost_poll *poll, struct file *file); |
46 | void vhost_poll_stop(struct vhost_poll *poll); |
47 | void vhost_poll_flush(struct vhost_poll *poll); |
48 | void vhost_poll_queue(struct vhost_poll *poll); |
49 | |
50 | struct vhost_log { |
51 | u64 addr; |
52 | u64 len; |
53 | }; |
54 | |
55 | struct vhost_virtqueue; |
56 | |
57 | struct vhost_ubuf_ref { |
58 | struct kref kref; |
59 | wait_queue_head_t wait; |
60 | struct vhost_virtqueue *vq; |
61 | }; |
62 | |
63 | struct vhost_ubuf_ref *vhost_ubuf_alloc(struct vhost_virtqueue *, bool zcopy); |
64 | void vhost_ubuf_put(struct vhost_ubuf_ref *); |
65 | void vhost_ubuf_put_and_wait(struct vhost_ubuf_ref *); |
66 | |
67 | struct ubuf_info; |
68 | |
69 | /* The virtqueue structure describes a queue attached to a device. */ |
70 | struct vhost_virtqueue { |
71 | struct vhost_dev *dev; |
72 | |
73 | /* The actual ring of buffers. */ |
74 | struct mutex mutex; |
75 | unsigned int num; |
76 | struct vring_desc __user *desc; |
77 | struct vring_avail __user *avail; |
78 | struct vring_used __user *used; |
79 | struct file *kick; |
80 | struct file *call; |
81 | struct file *error; |
82 | struct eventfd_ctx *call_ctx; |
83 | struct eventfd_ctx *error_ctx; |
84 | struct eventfd_ctx *log_ctx; |
85 | |
86 | struct vhost_poll poll; |
87 | |
88 | /* The routine to call when the Guest pings us, or timeout. */ |
89 | vhost_work_fn_t handle_kick; |
90 | |
91 | /* Last available index we saw. */ |
92 | u16 last_avail_idx; |
93 | |
94 | /* Caches available index value from user. */ |
95 | u16 avail_idx; |
96 | |
97 | /* Last index we used. */ |
98 | u16 last_used_idx; |
99 | |
100 | /* Used flags */ |
101 | u16 used_flags; |
102 | |
103 | /* Last used index value we have signalled on */ |
104 | u16 signalled_used; |
105 | |
106 | /* Last used index value we have signalled on */ |
107 | bool signalled_used_valid; |
108 | |
109 | /* Log writes to used structure. */ |
110 | bool log_used; |
111 | u64 log_addr; |
112 | |
113 | struct iovec iov[UIO_MAXIOV]; |
114 | /* hdr is used to store the virtio header. |
115 | * Since each iovec has >= 1 byte length, we never need more than |
116 | * header length entries to store the header. */ |
117 | struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)]; |
118 | struct iovec *indirect; |
119 | size_t vhost_hlen; |
120 | size_t sock_hlen; |
121 | struct vring_used_elem *heads; |
122 | /* We use a kind of RCU to access private pointer. |
123 | * All readers access it from worker, which makes it possible to |
124 | * flush the vhost_work instead of synchronize_rcu. Therefore readers do |
125 | * not need to call rcu_read_lock/rcu_read_unlock: the beginning of |
126 | * vhost_work execution acts instead of rcu_read_lock() and the end of |
127 | * vhost_work execution acts instead of rcu_read_unlock(). |
128 | * Writers use virtqueue mutex. */ |
129 | void __rcu *private_data; |
130 | /* Log write descriptors */ |
131 | void __user *log_base; |
132 | struct vhost_log *log; |
133 | /* vhost zerocopy support fields below: */ |
134 | /* last used idx for outstanding DMA zerocopy buffers */ |
135 | int upend_idx; |
136 | /* first used idx for DMA done zerocopy buffers */ |
137 | int done_idx; |
138 | /* an array of userspace buffers info */ |
139 | struct ubuf_info *ubuf_info; |
140 | /* Reference counting for outstanding ubufs. |
141 | * Protected by vq mutex. Writers must also take device mutex. */ |
142 | struct vhost_ubuf_ref *ubufs; |
143 | }; |
144 | |
145 | struct vhost_dev { |
146 | /* Readers use RCU to access memory table pointer |
147 | * log base pointer and features. |
148 | * Writers use mutex below.*/ |
149 | struct vhost_memory __rcu *memory; |
150 | struct mm_struct *mm; |
151 | struct mutex mutex; |
152 | unsigned acked_features; |
153 | struct vhost_virtqueue *vqs; |
154 | int nvqs; |
155 | struct file *log_file; |
156 | struct eventfd_ctx *log_ctx; |
157 | spinlock_t work_lock; |
158 | struct list_head work_list; |
159 | struct task_struct *worker; |
160 | }; |
161 | |
162 | long vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue *vqs, int nvqs); |
163 | long vhost_dev_check_owner(struct vhost_dev *); |
164 | long vhost_dev_reset_owner(struct vhost_dev *); |
165 | void vhost_dev_cleanup(struct vhost_dev *, bool locked); |
166 | void vhost_dev_stop(struct vhost_dev *); |
167 | long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, void __user *argp); |
168 | long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp); |
169 | int vhost_vq_access_ok(struct vhost_virtqueue *vq); |
170 | int vhost_log_access_ok(struct vhost_dev *); |
171 | |
172 | int vhost_get_vq_desc(struct vhost_dev *, struct vhost_virtqueue *, |
173 | struct iovec iov[], unsigned int iov_count, |
174 | unsigned int *out_num, unsigned int *in_num, |
175 | struct vhost_log *log, unsigned int *log_num); |
176 | void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); |
177 | |
178 | int vhost_init_used(struct vhost_virtqueue *); |
179 | int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len); |
180 | int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads, |
181 | unsigned count); |
182 | void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *, |
183 | unsigned int id, int len); |
184 | void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *, |
185 | struct vring_used_elem *heads, unsigned count); |
186 | void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *); |
187 | void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *); |
188 | bool vhost_enable_notify(struct vhost_dev *, struct vhost_virtqueue *); |
189 | |
190 | int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log, |
191 | unsigned int log_num, u64 len); |
192 | |
193 | #define vq_err(vq, fmt, ...) do { \ |
194 | pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \ |
195 | if ((vq)->error_ctx) \ |
196 | eventfd_signal((vq)->error_ctx, 1);\ |
197 | } while (0) |
198 | |
199 | enum { |
200 | VHOST_FEATURES = (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | |
201 | (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | |
202 | (1ULL << VIRTIO_RING_F_EVENT_IDX) | |
203 | (1ULL << VHOST_F_LOG_ALL), |
204 | VHOST_NET_FEATURES = VHOST_FEATURES | |
205 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | |
206 | (1ULL << VIRTIO_NET_F_MRG_RXBUF), |
207 | }; |
208 | |
209 | static inline int vhost_has_feature(struct vhost_dev *dev, int bit) |
210 | { |
211 | unsigned acked_features; |
212 | |
213 | /* TODO: check that we are running from vhost_worker or dev mutex is |
214 | * held? */ |
215 | acked_features = rcu_dereference_index_check(dev->acked_features, 1); |
216 | return acked_features & (1 << bit); |
217 | } |
218 | |
219 | void vhost_enable_zcopy(int vq); |
220 | |
221 | #endif |
222 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9