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1 | 967f97fa | aliguori | /*
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2 | 967f97fa | aliguori | * Virtio Support
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3 | 967f97fa | aliguori | *
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4 | 967f97fa | aliguori | * Copyright IBM, Corp. 2007
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5 | 967f97fa | aliguori | *
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6 | 967f97fa | aliguori | * Authors:
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7 | 967f97fa | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 967f97fa | aliguori | *
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9 | 967f97fa | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 967f97fa | aliguori | * the COPYING file in the top-level directory.
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11 | 967f97fa | aliguori | *
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12 | 967f97fa | aliguori | */
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13 | 967f97fa | aliguori | |
14 | 967f97fa | aliguori | #include <inttypes.h> |
15 | 967f97fa | aliguori | |
16 | 967f97fa | aliguori | #include "virtio.h" |
17 | 967f97fa | aliguori | #include "sysemu.h" |
18 | 967f97fa | aliguori | |
19 | f46f15bc | aliguori | /* The alignment to use between consumer and producer parts of vring.
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20 | f46f15bc | aliguori | * x86 pagesize again. */
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21 | f46f15bc | aliguori | #define VIRTIO_PCI_VRING_ALIGN 4096 |
22 | f46f15bc | aliguori | |
23 | 967f97fa | aliguori | /* QEMU doesn't strictly need write barriers since everything runs in
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24 | 967f97fa | aliguori | * lock-step. We'll leave the calls to wmb() in though to make it obvious for
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25 | 967f97fa | aliguori | * KVM or if kqemu gets SMP support.
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26 | 967f97fa | aliguori | */
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27 | 967f97fa | aliguori | #define wmb() do { } while (0) |
28 | 967f97fa | aliguori | |
29 | 967f97fa | aliguori | typedef struct VRingDesc |
30 | 967f97fa | aliguori | { |
31 | 967f97fa | aliguori | uint64_t addr; |
32 | 967f97fa | aliguori | uint32_t len; |
33 | 967f97fa | aliguori | uint16_t flags; |
34 | 967f97fa | aliguori | uint16_t next; |
35 | 967f97fa | aliguori | } VRingDesc; |
36 | 967f97fa | aliguori | |
37 | 967f97fa | aliguori | typedef struct VRingAvail |
38 | 967f97fa | aliguori | { |
39 | 967f97fa | aliguori | uint16_t flags; |
40 | 967f97fa | aliguori | uint16_t idx; |
41 | 967f97fa | aliguori | uint16_t ring[0];
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42 | 967f97fa | aliguori | } VRingAvail; |
43 | 967f97fa | aliguori | |
44 | 967f97fa | aliguori | typedef struct VRingUsedElem |
45 | 967f97fa | aliguori | { |
46 | 967f97fa | aliguori | uint32_t id; |
47 | 967f97fa | aliguori | uint32_t len; |
48 | 967f97fa | aliguori | } VRingUsedElem; |
49 | 967f97fa | aliguori | |
50 | 967f97fa | aliguori | typedef struct VRingUsed |
51 | 967f97fa | aliguori | { |
52 | 967f97fa | aliguori | uint16_t flags; |
53 | 967f97fa | aliguori | uint16_t idx; |
54 | 967f97fa | aliguori | VRingUsedElem ring[0];
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55 | 967f97fa | aliguori | } VRingUsed; |
56 | 967f97fa | aliguori | |
57 | 967f97fa | aliguori | typedef struct VRing |
58 | 967f97fa | aliguori | { |
59 | 967f97fa | aliguori | unsigned int num; |
60 | 967f97fa | aliguori | target_phys_addr_t desc; |
61 | 967f97fa | aliguori | target_phys_addr_t avail; |
62 | 967f97fa | aliguori | target_phys_addr_t used; |
63 | 967f97fa | aliguori | } VRing; |
64 | 967f97fa | aliguori | |
65 | 967f97fa | aliguori | struct VirtQueue
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66 | 967f97fa | aliguori | { |
67 | 967f97fa | aliguori | VRing vring; |
68 | 53c25cea | Paul Brook | target_phys_addr_t pa; |
69 | 967f97fa | aliguori | uint16_t last_avail_idx; |
70 | 967f97fa | aliguori | int inuse;
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71 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
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72 | 967f97fa | aliguori | }; |
73 | 967f97fa | aliguori | |
74 | 967f97fa | aliguori | #define VIRTIO_PCI_QUEUE_MAX 16 |
75 | 967f97fa | aliguori | |
76 | 967f97fa | aliguori | /* virt queue functions */
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77 | 53c25cea | Paul Brook | static void virtqueue_init(VirtQueue *vq) |
78 | 967f97fa | aliguori | { |
79 | 53c25cea | Paul Brook | target_phys_addr_t pa = vq->pa; |
80 | 53c25cea | Paul Brook | |
81 | 967f97fa | aliguori | vq->vring.desc = pa; |
82 | 967f97fa | aliguori | vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
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83 | f46f15bc | aliguori | vq->vring.used = vring_align(vq->vring.avail + |
84 | f46f15bc | aliguori | offsetof(VRingAvail, ring[vq->vring.num]), |
85 | f46f15bc | aliguori | VIRTIO_PCI_VRING_ALIGN); |
86 | 967f97fa | aliguori | } |
87 | 967f97fa | aliguori | |
88 | 967f97fa | aliguori | static inline uint64_t vring_desc_addr(VirtQueue *vq, int i) |
89 | 967f97fa | aliguori | { |
90 | 967f97fa | aliguori | target_phys_addr_t pa; |
91 | 967f97fa | aliguori | pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
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92 | 967f97fa | aliguori | return ldq_phys(pa);
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93 | 967f97fa | aliguori | } |
94 | 967f97fa | aliguori | |
95 | 967f97fa | aliguori | static inline uint32_t vring_desc_len(VirtQueue *vq, int i) |
96 | 967f97fa | aliguori | { |
97 | 967f97fa | aliguori | target_phys_addr_t pa; |
98 | 967f97fa | aliguori | pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
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99 | 967f97fa | aliguori | return ldl_phys(pa);
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100 | 967f97fa | aliguori | } |
101 | 967f97fa | aliguori | |
102 | 967f97fa | aliguori | static inline uint16_t vring_desc_flags(VirtQueue *vq, int i) |
103 | 967f97fa | aliguori | { |
104 | 967f97fa | aliguori | target_phys_addr_t pa; |
105 | 967f97fa | aliguori | pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
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106 | 967f97fa | aliguori | return lduw_phys(pa);
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107 | 967f97fa | aliguori | } |
108 | 967f97fa | aliguori | |
109 | 967f97fa | aliguori | static inline uint16_t vring_desc_next(VirtQueue *vq, int i) |
110 | 967f97fa | aliguori | { |
111 | 967f97fa | aliguori | target_phys_addr_t pa; |
112 | 967f97fa | aliguori | pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
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113 | 967f97fa | aliguori | return lduw_phys(pa);
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114 | 967f97fa | aliguori | } |
115 | 967f97fa | aliguori | |
116 | 967f97fa | aliguori | static inline uint16_t vring_avail_flags(VirtQueue *vq) |
117 | 967f97fa | aliguori | { |
118 | 967f97fa | aliguori | target_phys_addr_t pa; |
119 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
120 | 967f97fa | aliguori | return lduw_phys(pa);
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121 | 967f97fa | aliguori | } |
122 | 967f97fa | aliguori | |
123 | 967f97fa | aliguori | static inline uint16_t vring_avail_idx(VirtQueue *vq) |
124 | 967f97fa | aliguori | { |
125 | 967f97fa | aliguori | target_phys_addr_t pa; |
126 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
127 | 967f97fa | aliguori | return lduw_phys(pa);
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128 | 967f97fa | aliguori | } |
129 | 967f97fa | aliguori | |
130 | 967f97fa | aliguori | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
131 | 967f97fa | aliguori | { |
132 | 967f97fa | aliguori | target_phys_addr_t pa; |
133 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
134 | 967f97fa | aliguori | return lduw_phys(pa);
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135 | 967f97fa | aliguori | } |
136 | 967f97fa | aliguori | |
137 | 967f97fa | aliguori | static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
138 | 967f97fa | aliguori | { |
139 | 967f97fa | aliguori | target_phys_addr_t pa; |
140 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
141 | 967f97fa | aliguori | stl_phys(pa, val); |
142 | 967f97fa | aliguori | } |
143 | 967f97fa | aliguori | |
144 | 967f97fa | aliguori | static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) |
145 | 967f97fa | aliguori | { |
146 | 967f97fa | aliguori | target_phys_addr_t pa; |
147 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
148 | 967f97fa | aliguori | stl_phys(pa, val); |
149 | 967f97fa | aliguori | } |
150 | 967f97fa | aliguori | |
151 | 967f97fa | aliguori | static uint16_t vring_used_idx(VirtQueue *vq)
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152 | 967f97fa | aliguori | { |
153 | 967f97fa | aliguori | target_phys_addr_t pa; |
154 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
155 | 967f97fa | aliguori | return lduw_phys(pa);
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156 | 967f97fa | aliguori | } |
157 | 967f97fa | aliguori | |
158 | 967f97fa | aliguori | static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val) |
159 | 967f97fa | aliguori | { |
160 | 967f97fa | aliguori | target_phys_addr_t pa; |
161 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
162 | 967f97fa | aliguori | stw_phys(pa, vring_used_idx(vq) + val); |
163 | 967f97fa | aliguori | } |
164 | 967f97fa | aliguori | |
165 | 967f97fa | aliguori | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
166 | 967f97fa | aliguori | { |
167 | 967f97fa | aliguori | target_phys_addr_t pa; |
168 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
169 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) | mask); |
170 | 967f97fa | aliguori | } |
171 | 967f97fa | aliguori | |
172 | 967f97fa | aliguori | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
173 | 967f97fa | aliguori | { |
174 | 967f97fa | aliguori | target_phys_addr_t pa; |
175 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
176 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) & ~mask); |
177 | 967f97fa | aliguori | } |
178 | 967f97fa | aliguori | |
179 | 967f97fa | aliguori | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
180 | 967f97fa | aliguori | { |
181 | 967f97fa | aliguori | if (enable)
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182 | 967f97fa | aliguori | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
183 | 967f97fa | aliguori | else
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184 | 967f97fa | aliguori | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
185 | 967f97fa | aliguori | } |
186 | 967f97fa | aliguori | |
187 | 967f97fa | aliguori | int virtio_queue_ready(VirtQueue *vq)
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188 | 967f97fa | aliguori | { |
189 | 967f97fa | aliguori | return vq->vring.avail != 0; |
190 | 967f97fa | aliguori | } |
191 | 967f97fa | aliguori | |
192 | 967f97fa | aliguori | int virtio_queue_empty(VirtQueue *vq)
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193 | 967f97fa | aliguori | { |
194 | 967f97fa | aliguori | return vring_avail_idx(vq) == vq->last_avail_idx;
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195 | 967f97fa | aliguori | } |
196 | 967f97fa | aliguori | |
197 | 967f97fa | aliguori | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
198 | 967f97fa | aliguori | unsigned int len, unsigned int idx) |
199 | 967f97fa | aliguori | { |
200 | 967f97fa | aliguori | unsigned int offset; |
201 | 967f97fa | aliguori | int i;
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202 | 967f97fa | aliguori | |
203 | 967f97fa | aliguori | offset = 0;
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204 | 967f97fa | aliguori | for (i = 0; i < elem->in_num; i++) { |
205 | 967f97fa | aliguori | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
206 | 967f97fa | aliguori | |
207 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
208 | 26b258e1 | aliguori | elem->in_sg[i].iov_len, |
209 | 26b258e1 | aliguori | 1, size);
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210 | 967f97fa | aliguori | |
211 | 26b258e1 | aliguori | offset += elem->in_sg[i].iov_len; |
212 | 967f97fa | aliguori | } |
213 | 967f97fa | aliguori | |
214 | 26b258e1 | aliguori | for (i = 0; i < elem->out_num; i++) |
215 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, |
216 | 26b258e1 | aliguori | elem->out_sg[i].iov_len, |
217 | 26b258e1 | aliguori | 0, elem->out_sg[i].iov_len);
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218 | 26b258e1 | aliguori | |
219 | 967f97fa | aliguori | idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
220 | 967f97fa | aliguori | |
221 | 967f97fa | aliguori | /* Get a pointer to the next entry in the used ring. */
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222 | 967f97fa | aliguori | vring_used_ring_id(vq, idx, elem->index); |
223 | 967f97fa | aliguori | vring_used_ring_len(vq, idx, len); |
224 | 967f97fa | aliguori | } |
225 | 967f97fa | aliguori | |
226 | 967f97fa | aliguori | void virtqueue_flush(VirtQueue *vq, unsigned int count) |
227 | 967f97fa | aliguori | { |
228 | 967f97fa | aliguori | /* Make sure buffer is written before we update index. */
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229 | 967f97fa | aliguori | wmb(); |
230 | 967f97fa | aliguori | vring_used_idx_increment(vq, count); |
231 | 967f97fa | aliguori | vq->inuse -= count; |
232 | 967f97fa | aliguori | } |
233 | 967f97fa | aliguori | |
234 | 967f97fa | aliguori | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
235 | 967f97fa | aliguori | unsigned int len) |
236 | 967f97fa | aliguori | { |
237 | 967f97fa | aliguori | virtqueue_fill(vq, elem, len, 0);
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238 | 967f97fa | aliguori | virtqueue_flush(vq, 1);
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239 | 967f97fa | aliguori | } |
240 | 967f97fa | aliguori | |
241 | 967f97fa | aliguori | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
242 | 967f97fa | aliguori | { |
243 | 967f97fa | aliguori | uint16_t num_heads = vring_avail_idx(vq) - idx; |
244 | 967f97fa | aliguori | |
245 | 967f97fa | aliguori | /* Check it isn't doing very strange things with descriptor numbers. */
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246 | bb6834cf | aliguori | if (num_heads > vq->vring.num) {
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247 | bb6834cf | aliguori | fprintf(stderr, "Guest moved used index from %u to %u",
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248 | bb6834cf | aliguori | idx, vring_avail_idx(vq)); |
249 | bb6834cf | aliguori | exit(1);
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250 | bb6834cf | aliguori | } |
251 | 967f97fa | aliguori | |
252 | 967f97fa | aliguori | return num_heads;
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253 | 967f97fa | aliguori | } |
254 | 967f97fa | aliguori | |
255 | 967f97fa | aliguori | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) |
256 | 967f97fa | aliguori | { |
257 | 967f97fa | aliguori | unsigned int head; |
258 | 967f97fa | aliguori | |
259 | 967f97fa | aliguori | /* Grab the next descriptor number they're advertising, and increment
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260 | 967f97fa | aliguori | * the index we've seen. */
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261 | 967f97fa | aliguori | head = vring_avail_ring(vq, idx % vq->vring.num); |
262 | 967f97fa | aliguori | |
263 | 967f97fa | aliguori | /* If their number is silly, that's a fatal mistake. */
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264 | bb6834cf | aliguori | if (head >= vq->vring.num) {
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265 | bb6834cf | aliguori | fprintf(stderr, "Guest says index %u is available", head);
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266 | bb6834cf | aliguori | exit(1);
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267 | bb6834cf | aliguori | } |
268 | 967f97fa | aliguori | |
269 | 967f97fa | aliguori | return head;
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270 | 967f97fa | aliguori | } |
271 | 967f97fa | aliguori | |
272 | 967f97fa | aliguori | static unsigned virtqueue_next_desc(VirtQueue *vq, unsigned int i) |
273 | 967f97fa | aliguori | { |
274 | 967f97fa | aliguori | unsigned int next; |
275 | 967f97fa | aliguori | |
276 | 967f97fa | aliguori | /* If this descriptor says it doesn't chain, we're done. */
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277 | 967f97fa | aliguori | if (!(vring_desc_flags(vq, i) & VRING_DESC_F_NEXT))
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278 | 967f97fa | aliguori | return vq->vring.num;
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279 | 967f97fa | aliguori | |
280 | 967f97fa | aliguori | /* Check they're not leading us off end of descriptors. */
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281 | 967f97fa | aliguori | next = vring_desc_next(vq, i); |
282 | 967f97fa | aliguori | /* Make sure compiler knows to grab that: we don't want it changing! */
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283 | 967f97fa | aliguori | wmb(); |
284 | 967f97fa | aliguori | |
285 | bb6834cf | aliguori | if (next >= vq->vring.num) {
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286 | bb6834cf | aliguori | fprintf(stderr, "Desc next is %u", next);
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287 | bb6834cf | aliguori | exit(1);
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288 | bb6834cf | aliguori | } |
289 | 967f97fa | aliguori | |
290 | 967f97fa | aliguori | return next;
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291 | 967f97fa | aliguori | } |
292 | 967f97fa | aliguori | |
293 | 967f97fa | aliguori | int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes) |
294 | 967f97fa | aliguori | { |
295 | 967f97fa | aliguori | unsigned int idx; |
296 | 967f97fa | aliguori | int num_bufs, in_total, out_total;
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297 | 967f97fa | aliguori | |
298 | 967f97fa | aliguori | idx = vq->last_avail_idx; |
299 | 967f97fa | aliguori | |
300 | 967f97fa | aliguori | num_bufs = in_total = out_total = 0;
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301 | 967f97fa | aliguori | while (virtqueue_num_heads(vq, idx)) {
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302 | 967f97fa | aliguori | int i;
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303 | 967f97fa | aliguori | |
304 | 967f97fa | aliguori | i = virtqueue_get_head(vq, idx++); |
305 | 967f97fa | aliguori | do {
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306 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
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307 | bb6834cf | aliguori | if (++num_bufs > vq->vring.num) {
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308 | bb6834cf | aliguori | fprintf(stderr, "Looped descriptor");
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309 | bb6834cf | aliguori | exit(1);
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310 | bb6834cf | aliguori | } |
311 | 967f97fa | aliguori | |
312 | 967f97fa | aliguori | if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
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313 | 967f97fa | aliguori | if (in_bytes > 0 && |
314 | 967f97fa | aliguori | (in_total += vring_desc_len(vq, i)) >= in_bytes) |
315 | 967f97fa | aliguori | return 1; |
316 | 967f97fa | aliguori | } else {
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317 | 967f97fa | aliguori | if (out_bytes > 0 && |
318 | 967f97fa | aliguori | (out_total += vring_desc_len(vq, i)) >= out_bytes) |
319 | 967f97fa | aliguori | return 1; |
320 | 967f97fa | aliguori | } |
321 | 967f97fa | aliguori | } while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
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322 | 967f97fa | aliguori | } |
323 | 967f97fa | aliguori | |
324 | 967f97fa | aliguori | return 0; |
325 | 967f97fa | aliguori | } |
326 | 967f97fa | aliguori | |
327 | 967f97fa | aliguori | int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
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328 | 967f97fa | aliguori | { |
329 | 967f97fa | aliguori | unsigned int i, head; |
330 | 26b258e1 | aliguori | target_phys_addr_t len; |
331 | 967f97fa | aliguori | |
332 | 967f97fa | aliguori | if (!virtqueue_num_heads(vq, vq->last_avail_idx))
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333 | 967f97fa | aliguori | return 0; |
334 | 967f97fa | aliguori | |
335 | 967f97fa | aliguori | /* When we start there are none of either input nor output. */
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336 | 967f97fa | aliguori | elem->out_num = elem->in_num = 0;
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337 | 967f97fa | aliguori | |
338 | 967f97fa | aliguori | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
339 | 967f97fa | aliguori | do {
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340 | 967f97fa | aliguori | struct iovec *sg;
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341 | 26b258e1 | aliguori | int is_write = 0; |
342 | 967f97fa | aliguori | |
343 | 967f97fa | aliguori | if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
|
344 | 967f97fa | aliguori | elem->in_addr[elem->in_num] = vring_desc_addr(vq, i); |
345 | 967f97fa | aliguori | sg = &elem->in_sg[elem->in_num++]; |
346 | 26b258e1 | aliguori | is_write = 1;
|
347 | 967f97fa | aliguori | } else
|
348 | 967f97fa | aliguori | sg = &elem->out_sg[elem->out_num++]; |
349 | 967f97fa | aliguori | |
350 | 967f97fa | aliguori | /* Grab the first descriptor, and check it's OK. */
|
351 | 967f97fa | aliguori | sg->iov_len = vring_desc_len(vq, i); |
352 | 26b258e1 | aliguori | len = sg->iov_len; |
353 | 967f97fa | aliguori | |
354 | 26b258e1 | aliguori | sg->iov_base = cpu_physical_memory_map(vring_desc_addr(vq, i), &len, is_write); |
355 | 26b258e1 | aliguori | |
356 | 26b258e1 | aliguori | if (sg->iov_base == NULL || len != sg->iov_len) { |
357 | 26b258e1 | aliguori | fprintf(stderr, "virtio: trying to map MMIO memory\n");
|
358 | bb6834cf | aliguori | exit(1);
|
359 | bb6834cf | aliguori | } |
360 | 967f97fa | aliguori | |
361 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
|
362 | bb6834cf | aliguori | if ((elem->in_num + elem->out_num) > vq->vring.num) {
|
363 | bb6834cf | aliguori | fprintf(stderr, "Looped descriptor");
|
364 | bb6834cf | aliguori | exit(1);
|
365 | bb6834cf | aliguori | } |
366 | 967f97fa | aliguori | } while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
|
367 | 967f97fa | aliguori | |
368 | 967f97fa | aliguori | elem->index = head; |
369 | 967f97fa | aliguori | |
370 | 967f97fa | aliguori | vq->inuse++; |
371 | 967f97fa | aliguori | |
372 | 967f97fa | aliguori | return elem->in_num + elem->out_num;
|
373 | 967f97fa | aliguori | } |
374 | 967f97fa | aliguori | |
375 | 967f97fa | aliguori | /* virtio device */
|
376 | 967f97fa | aliguori | |
377 | 53c25cea | Paul Brook | void virtio_update_irq(VirtIODevice *vdev)
|
378 | 967f97fa | aliguori | { |
379 | 53c25cea | Paul Brook | if (vdev->binding->update_irq) {
|
380 | 53c25cea | Paul Brook | vdev->binding->update_irq(vdev->binding_opaque); |
381 | 53c25cea | Paul Brook | } |
382 | 967f97fa | aliguori | } |
383 | 967f97fa | aliguori | |
384 | 53c25cea | Paul Brook | void virtio_reset(void *opaque) |
385 | 967f97fa | aliguori | { |
386 | 967f97fa | aliguori | VirtIODevice *vdev = opaque; |
387 | 967f97fa | aliguori | int i;
|
388 | 967f97fa | aliguori | |
389 | 967f97fa | aliguori | if (vdev->reset)
|
390 | 967f97fa | aliguori | vdev->reset(vdev); |
391 | 967f97fa | aliguori | |
392 | 967f97fa | aliguori | vdev->features = 0;
|
393 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
394 | 967f97fa | aliguori | vdev->status = 0;
|
395 | 967f97fa | aliguori | vdev->isr = 0;
|
396 | 967f97fa | aliguori | virtio_update_irq(vdev); |
397 | 967f97fa | aliguori | |
398 | 967f97fa | aliguori | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
399 | 967f97fa | aliguori | vdev->vq[i].vring.desc = 0;
|
400 | 967f97fa | aliguori | vdev->vq[i].vring.avail = 0;
|
401 | 967f97fa | aliguori | vdev->vq[i].vring.used = 0;
|
402 | 967f97fa | aliguori | vdev->vq[i].last_avail_idx = 0;
|
403 | 53c25cea | Paul Brook | vdev->vq[i].pa = 0;
|
404 | 967f97fa | aliguori | } |
405 | 967f97fa | aliguori | } |
406 | 967f97fa | aliguori | |
407 | 53c25cea | Paul Brook | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
408 | 967f97fa | aliguori | { |
409 | 967f97fa | aliguori | uint8_t val; |
410 | 967f97fa | aliguori | |
411 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
412 | 967f97fa | aliguori | |
413 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
414 | 967f97fa | aliguori | return (uint32_t)-1; |
415 | 967f97fa | aliguori | |
416 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
417 | 967f97fa | aliguori | return val;
|
418 | 967f97fa | aliguori | } |
419 | 967f97fa | aliguori | |
420 | 53c25cea | Paul Brook | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
421 | 967f97fa | aliguori | { |
422 | 967f97fa | aliguori | uint16_t val; |
423 | 967f97fa | aliguori | |
424 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
425 | 967f97fa | aliguori | |
426 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
427 | 967f97fa | aliguori | return (uint32_t)-1; |
428 | 967f97fa | aliguori | |
429 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
430 | 967f97fa | aliguori | return val;
|
431 | 967f97fa | aliguori | } |
432 | 967f97fa | aliguori | |
433 | 53c25cea | Paul Brook | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
434 | 967f97fa | aliguori | { |
435 | 967f97fa | aliguori | uint32_t val; |
436 | 967f97fa | aliguori | |
437 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
438 | 967f97fa | aliguori | |
439 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
440 | 967f97fa | aliguori | return (uint32_t)-1; |
441 | 967f97fa | aliguori | |
442 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
443 | 967f97fa | aliguori | return val;
|
444 | 967f97fa | aliguori | } |
445 | 967f97fa | aliguori | |
446 | 53c25cea | Paul Brook | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
447 | 967f97fa | aliguori | { |
448 | 967f97fa | aliguori | uint8_t val = data; |
449 | 967f97fa | aliguori | |
450 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
451 | 967f97fa | aliguori | return;
|
452 | 967f97fa | aliguori | |
453 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
454 | 967f97fa | aliguori | |
455 | 967f97fa | aliguori | if (vdev->set_config)
|
456 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
457 | 967f97fa | aliguori | } |
458 | 967f97fa | aliguori | |
459 | 53c25cea | Paul Brook | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
460 | 967f97fa | aliguori | { |
461 | 967f97fa | aliguori | uint16_t val = data; |
462 | 967f97fa | aliguori | |
463 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
464 | 967f97fa | aliguori | return;
|
465 | 967f97fa | aliguori | |
466 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
467 | 967f97fa | aliguori | |
468 | 967f97fa | aliguori | if (vdev->set_config)
|
469 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
470 | 967f97fa | aliguori | } |
471 | 967f97fa | aliguori | |
472 | 53c25cea | Paul Brook | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
473 | 967f97fa | aliguori | { |
474 | 967f97fa | aliguori | uint32_t val = data; |
475 | 967f97fa | aliguori | |
476 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
477 | 967f97fa | aliguori | return;
|
478 | 967f97fa | aliguori | |
479 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
480 | 967f97fa | aliguori | |
481 | 967f97fa | aliguori | if (vdev->set_config)
|
482 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
483 | 967f97fa | aliguori | } |
484 | 967f97fa | aliguori | |
485 | 53c25cea | Paul Brook | void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr) |
486 | 967f97fa | aliguori | { |
487 | 53c25cea | Paul Brook | if (addr == 0) { |
488 | 53c25cea | Paul Brook | virtio_reset(vdev); |
489 | 53c25cea | Paul Brook | } else {
|
490 | 53c25cea | Paul Brook | vdev->vq[n].pa = addr; |
491 | 53c25cea | Paul Brook | virtqueue_init(&vdev->vq[n]); |
492 | 967f97fa | aliguori | } |
493 | 53c25cea | Paul Brook | } |
494 | 53c25cea | Paul Brook | |
495 | 53c25cea | Paul Brook | target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
496 | 53c25cea | Paul Brook | { |
497 | 53c25cea | Paul Brook | return vdev->vq[n].pa;
|
498 | 53c25cea | Paul Brook | } |
499 | 53c25cea | Paul Brook | |
500 | 53c25cea | Paul Brook | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
501 | 53c25cea | Paul Brook | { |
502 | 53c25cea | Paul Brook | return vdev->vq[n].vring.num;
|
503 | 53c25cea | Paul Brook | } |
504 | 967f97fa | aliguori | |
505 | 53c25cea | Paul Brook | void virtio_queue_notify(VirtIODevice *vdev, int n) |
506 | 53c25cea | Paul Brook | { |
507 | 53c25cea | Paul Brook | if (n < VIRTIO_PCI_QUEUE_MAX && vdev->vq[n].vring.desc) {
|
508 | 53c25cea | Paul Brook | vdev->vq[n].handle_output(vdev, &vdev->vq[n]); |
509 | 967f97fa | aliguori | } |
510 | 967f97fa | aliguori | } |
511 | 967f97fa | aliguori | |
512 | 967f97fa | aliguori | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
513 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *, VirtQueue *))
|
514 | 967f97fa | aliguori | { |
515 | 967f97fa | aliguori | int i;
|
516 | 967f97fa | aliguori | |
517 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
518 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
519 | 967f97fa | aliguori | break;
|
520 | 967f97fa | aliguori | } |
521 | 967f97fa | aliguori | |
522 | 967f97fa | aliguori | if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
523 | 967f97fa | aliguori | abort(); |
524 | 967f97fa | aliguori | |
525 | 967f97fa | aliguori | vdev->vq[i].vring.num = queue_size; |
526 | 967f97fa | aliguori | vdev->vq[i].handle_output = handle_output; |
527 | 967f97fa | aliguori | |
528 | 967f97fa | aliguori | return &vdev->vq[i];
|
529 | 967f97fa | aliguori | } |
530 | 967f97fa | aliguori | |
531 | 967f97fa | aliguori | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
532 | 967f97fa | aliguori | { |
533 | 97b83deb | aliguori | /* Always notify when queue is empty (when feature acknowledge) */
|
534 | 97b83deb | aliguori | if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
535 | 97b83deb | aliguori | (!(vdev->features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
536 | 97b83deb | aliguori | (vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx))) |
537 | 967f97fa | aliguori | return;
|
538 | 967f97fa | aliguori | |
539 | 967f97fa | aliguori | vdev->isr |= 0x01;
|
540 | 967f97fa | aliguori | virtio_update_irq(vdev); |
541 | 967f97fa | aliguori | } |
542 | 967f97fa | aliguori | |
543 | 967f97fa | aliguori | void virtio_notify_config(VirtIODevice *vdev)
|
544 | 967f97fa | aliguori | { |
545 | 7625162c | aliguori | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
546 | 7625162c | aliguori | return;
|
547 | 7625162c | aliguori | |
548 | 967f97fa | aliguori | vdev->isr |= 0x03;
|
549 | 967f97fa | aliguori | virtio_update_irq(vdev); |
550 | 967f97fa | aliguori | } |
551 | 967f97fa | aliguori | |
552 | 967f97fa | aliguori | void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
553 | 967f97fa | aliguori | { |
554 | 967f97fa | aliguori | int i;
|
555 | 967f97fa | aliguori | |
556 | 53c25cea | Paul Brook | /* FIXME: load/save binding. */
|
557 | 53c25cea | Paul Brook | //pci_device_save(&vdev->pci_dev, f);
|
558 | 967f97fa | aliguori | |
559 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->status); |
560 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->isr); |
561 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->queue_sel); |
562 | 967f97fa | aliguori | qemu_put_be32s(f, &vdev->features); |
563 | 967f97fa | aliguori | qemu_put_be32(f, vdev->config_len); |
564 | 967f97fa | aliguori | qemu_put_buffer(f, vdev->config, vdev->config_len); |
565 | 967f97fa | aliguori | |
566 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
567 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
568 | 967f97fa | aliguori | break;
|
569 | 967f97fa | aliguori | } |
570 | 967f97fa | aliguori | |
571 | 967f97fa | aliguori | qemu_put_be32(f, i); |
572 | 967f97fa | aliguori | |
573 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
574 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
575 | 967f97fa | aliguori | break;
|
576 | 967f97fa | aliguori | |
577 | 967f97fa | aliguori | qemu_put_be32(f, vdev->vq[i].vring.num); |
578 | 53c25cea | Paul Brook | qemu_put_be64(f, vdev->vq[i].pa); |
579 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
580 | 967f97fa | aliguori | } |
581 | 967f97fa | aliguori | } |
582 | 967f97fa | aliguori | |
583 | 967f97fa | aliguori | void virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
584 | 967f97fa | aliguori | { |
585 | 967f97fa | aliguori | int num, i;
|
586 | 967f97fa | aliguori | |
587 | 53c25cea | Paul Brook | /* FIXME: load/save binding. */
|
588 | 53c25cea | Paul Brook | //pci_device_load(&vdev->pci_dev, f);
|
589 | 967f97fa | aliguori | |
590 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->status); |
591 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->isr); |
592 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->queue_sel); |
593 | 967f97fa | aliguori | qemu_get_be32s(f, &vdev->features); |
594 | 967f97fa | aliguori | vdev->config_len = qemu_get_be32(f); |
595 | 967f97fa | aliguori | qemu_get_buffer(f, vdev->config, vdev->config_len); |
596 | 967f97fa | aliguori | |
597 | 967f97fa | aliguori | num = qemu_get_be32(f); |
598 | 967f97fa | aliguori | |
599 | 967f97fa | aliguori | for (i = 0; i < num; i++) { |
600 | 967f97fa | aliguori | vdev->vq[i].vring.num = qemu_get_be32(f); |
601 | 53c25cea | Paul Brook | vdev->vq[i].pa = qemu_get_be64(f); |
602 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
603 | 967f97fa | aliguori | |
604 | 53c25cea | Paul Brook | if (vdev->vq[i].pa) {
|
605 | 53c25cea | Paul Brook | virtqueue_init(&vdev->vq[i]); |
606 | 967f97fa | aliguori | } |
607 | 967f97fa | aliguori | } |
608 | 967f97fa | aliguori | |
609 | 967f97fa | aliguori | virtio_update_irq(vdev); |
610 | 967f97fa | aliguori | } |
611 | 967f97fa | aliguori | |
612 | b946a153 | aliguori | void virtio_cleanup(VirtIODevice *vdev)
|
613 | b946a153 | aliguori | { |
614 | b946a153 | aliguori | if (vdev->config)
|
615 | b946a153 | aliguori | qemu_free(vdev->config); |
616 | b946a153 | aliguori | qemu_free(vdev->vq); |
617 | b946a153 | aliguori | } |
618 | b946a153 | aliguori | |
619 | 53c25cea | Paul Brook | VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, |
620 | 53c25cea | Paul Brook | size_t config_size, size_t struct_size) |
621 | 967f97fa | aliguori | { |
622 | 967f97fa | aliguori | VirtIODevice *vdev; |
623 | 967f97fa | aliguori | |
624 | 53c25cea | Paul Brook | vdev = qemu_mallocz(struct_size); |
625 | 967f97fa | aliguori | |
626 | 53c25cea | Paul Brook | vdev->device_id = device_id; |
627 | 967f97fa | aliguori | vdev->status = 0;
|
628 | 967f97fa | aliguori | vdev->isr = 0;
|
629 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
630 | 967f97fa | aliguori | vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
631 | 967f97fa | aliguori | |
632 | 967f97fa | aliguori | vdev->name = name; |
633 | 967f97fa | aliguori | vdev->config_len = config_size; |
634 | 967f97fa | aliguori | if (vdev->config_len)
|
635 | 967f97fa | aliguori | vdev->config = qemu_mallocz(config_size); |
636 | 967f97fa | aliguori | else
|
637 | 967f97fa | aliguori | vdev->config = NULL;
|
638 | 967f97fa | aliguori | |
639 | 967f97fa | aliguori | qemu_register_reset(virtio_reset, vdev); |
640 | 967f97fa | aliguori | return vdev;
|
641 | 967f97fa | aliguori | } |
642 | 53c25cea | Paul Brook | |
643 | 53c25cea | Paul Brook | void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, |
644 | 53c25cea | Paul Brook | void *opaque)
|
645 | 53c25cea | Paul Brook | { |
646 | 53c25cea | Paul Brook | vdev->binding = binding; |
647 | 53c25cea | Paul Brook | vdev->binding_opaque = opaque; |
648 | 53c25cea | Paul Brook | } |