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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 | c227f099 | Anthony Liguori | target_phys_addr_t desc; |
61 | c227f099 | Anthony Liguori | target_phys_addr_t avail; |
62 | c227f099 | Anthony Liguori | 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 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
69 | 967f97fa | aliguori | uint16_t last_avail_idx; |
70 | 967f97fa | aliguori | int inuse;
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71 | 7055e687 | Michael S. Tsirkin | uint16_t vector; |
72 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
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73 | 967f97fa | aliguori | }; |
74 | 967f97fa | aliguori | |
75 | 967f97fa | aliguori | #define VIRTIO_PCI_QUEUE_MAX 16 |
76 | 967f97fa | aliguori | |
77 | 967f97fa | aliguori | /* virt queue functions */
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78 | 53c25cea | Paul Brook | static void virtqueue_init(VirtQueue *vq) |
79 | 967f97fa | aliguori | { |
80 | c227f099 | Anthony Liguori | target_phys_addr_t pa = vq->pa; |
81 | 53c25cea | Paul Brook | |
82 | 967f97fa | aliguori | vq->vring.desc = pa; |
83 | 967f97fa | aliguori | vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
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84 | f46f15bc | aliguori | vq->vring.used = vring_align(vq->vring.avail + |
85 | f46f15bc | aliguori | offsetof(VRingAvail, ring[vq->vring.num]), |
86 | f46f15bc | aliguori | VIRTIO_PCI_VRING_ALIGN); |
87 | 967f97fa | aliguori | } |
88 | 967f97fa | aliguori | |
89 | c227f099 | Anthony Liguori | static inline uint64_t vring_desc_addr(target_phys_addr_t desc_pa, int i) |
90 | 967f97fa | aliguori | { |
91 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
92 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
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93 | 967f97fa | aliguori | return ldq_phys(pa);
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94 | 967f97fa | aliguori | } |
95 | 967f97fa | aliguori | |
96 | c227f099 | Anthony Liguori | static inline uint32_t vring_desc_len(target_phys_addr_t desc_pa, int i) |
97 | 967f97fa | aliguori | { |
98 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
99 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
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100 | 967f97fa | aliguori | return ldl_phys(pa);
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101 | 967f97fa | aliguori | } |
102 | 967f97fa | aliguori | |
103 | c227f099 | Anthony Liguori | static inline uint16_t vring_desc_flags(target_phys_addr_t desc_pa, int i) |
104 | 967f97fa | aliguori | { |
105 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
106 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
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107 | 967f97fa | aliguori | return lduw_phys(pa);
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108 | 967f97fa | aliguori | } |
109 | 967f97fa | aliguori | |
110 | c227f099 | Anthony Liguori | static inline uint16_t vring_desc_next(target_phys_addr_t desc_pa, int i) |
111 | 967f97fa | aliguori | { |
112 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
113 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
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114 | 967f97fa | aliguori | return lduw_phys(pa);
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115 | 967f97fa | aliguori | } |
116 | 967f97fa | aliguori | |
117 | 967f97fa | aliguori | static inline uint16_t vring_avail_flags(VirtQueue *vq) |
118 | 967f97fa | aliguori | { |
119 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
120 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
121 | 967f97fa | aliguori | return lduw_phys(pa);
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122 | 967f97fa | aliguori | } |
123 | 967f97fa | aliguori | |
124 | 967f97fa | aliguori | static inline uint16_t vring_avail_idx(VirtQueue *vq) |
125 | 967f97fa | aliguori | { |
126 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
127 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
128 | 967f97fa | aliguori | return lduw_phys(pa);
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129 | 967f97fa | aliguori | } |
130 | 967f97fa | aliguori | |
131 | 967f97fa | aliguori | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
132 | 967f97fa | aliguori | { |
133 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
134 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
135 | 967f97fa | aliguori | return lduw_phys(pa);
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136 | 967f97fa | aliguori | } |
137 | 967f97fa | aliguori | |
138 | 967f97fa | aliguori | static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
139 | 967f97fa | aliguori | { |
140 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
141 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
142 | 967f97fa | aliguori | stl_phys(pa, val); |
143 | 967f97fa | aliguori | } |
144 | 967f97fa | aliguori | |
145 | 967f97fa | aliguori | static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) |
146 | 967f97fa | aliguori | { |
147 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
148 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
149 | 967f97fa | aliguori | stl_phys(pa, val); |
150 | 967f97fa | aliguori | } |
151 | 967f97fa | aliguori | |
152 | 967f97fa | aliguori | static uint16_t vring_used_idx(VirtQueue *vq)
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153 | 967f97fa | aliguori | { |
154 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
155 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
156 | 967f97fa | aliguori | return lduw_phys(pa);
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157 | 967f97fa | aliguori | } |
158 | 967f97fa | aliguori | |
159 | 967f97fa | aliguori | static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val) |
160 | 967f97fa | aliguori | { |
161 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
162 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
163 | 967f97fa | aliguori | stw_phys(pa, vring_used_idx(vq) + val); |
164 | 967f97fa | aliguori | } |
165 | 967f97fa | aliguori | |
166 | 967f97fa | aliguori | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
167 | 967f97fa | aliguori | { |
168 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
169 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
170 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) | mask); |
171 | 967f97fa | aliguori | } |
172 | 967f97fa | aliguori | |
173 | 967f97fa | aliguori | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
174 | 967f97fa | aliguori | { |
175 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
176 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
177 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) & ~mask); |
178 | 967f97fa | aliguori | } |
179 | 967f97fa | aliguori | |
180 | 967f97fa | aliguori | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
181 | 967f97fa | aliguori | { |
182 | 967f97fa | aliguori | if (enable)
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183 | 967f97fa | aliguori | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
184 | 967f97fa | aliguori | else
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185 | 967f97fa | aliguori | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
186 | 967f97fa | aliguori | } |
187 | 967f97fa | aliguori | |
188 | 967f97fa | aliguori | int virtio_queue_ready(VirtQueue *vq)
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189 | 967f97fa | aliguori | { |
190 | 967f97fa | aliguori | return vq->vring.avail != 0; |
191 | 967f97fa | aliguori | } |
192 | 967f97fa | aliguori | |
193 | 967f97fa | aliguori | int virtio_queue_empty(VirtQueue *vq)
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194 | 967f97fa | aliguori | { |
195 | 967f97fa | aliguori | return vring_avail_idx(vq) == vq->last_avail_idx;
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196 | 967f97fa | aliguori | } |
197 | 967f97fa | aliguori | |
198 | 967f97fa | aliguori | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
199 | 967f97fa | aliguori | unsigned int len, unsigned int idx) |
200 | 967f97fa | aliguori | { |
201 | 967f97fa | aliguori | unsigned int offset; |
202 | 967f97fa | aliguori | int i;
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203 | 967f97fa | aliguori | |
204 | 967f97fa | aliguori | offset = 0;
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205 | 967f97fa | aliguori | for (i = 0; i < elem->in_num; i++) { |
206 | 967f97fa | aliguori | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
207 | 967f97fa | aliguori | |
208 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
209 | 26b258e1 | aliguori | elem->in_sg[i].iov_len, |
210 | 26b258e1 | aliguori | 1, size);
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211 | 967f97fa | aliguori | |
212 | 26b258e1 | aliguori | offset += elem->in_sg[i].iov_len; |
213 | 967f97fa | aliguori | } |
214 | 967f97fa | aliguori | |
215 | 26b258e1 | aliguori | for (i = 0; i < elem->out_num; i++) |
216 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, |
217 | 26b258e1 | aliguori | elem->out_sg[i].iov_len, |
218 | 26b258e1 | aliguori | 0, elem->out_sg[i].iov_len);
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219 | 26b258e1 | aliguori | |
220 | 967f97fa | aliguori | idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
221 | 967f97fa | aliguori | |
222 | 967f97fa | aliguori | /* Get a pointer to the next entry in the used ring. */
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223 | 967f97fa | aliguori | vring_used_ring_id(vq, idx, elem->index); |
224 | 967f97fa | aliguori | vring_used_ring_len(vq, idx, len); |
225 | 967f97fa | aliguori | } |
226 | 967f97fa | aliguori | |
227 | 967f97fa | aliguori | void virtqueue_flush(VirtQueue *vq, unsigned int count) |
228 | 967f97fa | aliguori | { |
229 | 967f97fa | aliguori | /* Make sure buffer is written before we update index. */
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230 | 967f97fa | aliguori | wmb(); |
231 | 967f97fa | aliguori | vring_used_idx_increment(vq, count); |
232 | 967f97fa | aliguori | vq->inuse -= count; |
233 | 967f97fa | aliguori | } |
234 | 967f97fa | aliguori | |
235 | 967f97fa | aliguori | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
236 | 967f97fa | aliguori | unsigned int len) |
237 | 967f97fa | aliguori | { |
238 | 967f97fa | aliguori | virtqueue_fill(vq, elem, len, 0);
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239 | 967f97fa | aliguori | virtqueue_flush(vq, 1);
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240 | 967f97fa | aliguori | } |
241 | 967f97fa | aliguori | |
242 | 967f97fa | aliguori | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
243 | 967f97fa | aliguori | { |
244 | 967f97fa | aliguori | uint16_t num_heads = vring_avail_idx(vq) - idx; |
245 | 967f97fa | aliguori | |
246 | 967f97fa | aliguori | /* Check it isn't doing very strange things with descriptor numbers. */
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247 | bb6834cf | aliguori | if (num_heads > vq->vring.num) {
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248 | bb6834cf | aliguori | fprintf(stderr, "Guest moved used index from %u to %u",
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249 | bb6834cf | aliguori | idx, vring_avail_idx(vq)); |
250 | bb6834cf | aliguori | exit(1);
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251 | bb6834cf | aliguori | } |
252 | 967f97fa | aliguori | |
253 | 967f97fa | aliguori | return num_heads;
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254 | 967f97fa | aliguori | } |
255 | 967f97fa | aliguori | |
256 | 967f97fa | aliguori | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) |
257 | 967f97fa | aliguori | { |
258 | 967f97fa | aliguori | unsigned int head; |
259 | 967f97fa | aliguori | |
260 | 967f97fa | aliguori | /* Grab the next descriptor number they're advertising, and increment
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261 | 967f97fa | aliguori | * the index we've seen. */
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262 | 967f97fa | aliguori | head = vring_avail_ring(vq, idx % vq->vring.num); |
263 | 967f97fa | aliguori | |
264 | 967f97fa | aliguori | /* If their number is silly, that's a fatal mistake. */
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265 | bb6834cf | aliguori | if (head >= vq->vring.num) {
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266 | bb6834cf | aliguori | fprintf(stderr, "Guest says index %u is available", head);
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267 | bb6834cf | aliguori | exit(1);
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268 | bb6834cf | aliguori | } |
269 | 967f97fa | aliguori | |
270 | 967f97fa | aliguori | return head;
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271 | 967f97fa | aliguori | } |
272 | 967f97fa | aliguori | |
273 | c227f099 | Anthony Liguori | static unsigned virtqueue_next_desc(target_phys_addr_t desc_pa, |
274 | 5774cf98 | Mark McLoughlin | unsigned int i, unsigned int max) |
275 | 967f97fa | aliguori | { |
276 | 967f97fa | aliguori | unsigned int next; |
277 | 967f97fa | aliguori | |
278 | 967f97fa | aliguori | /* If this descriptor says it doesn't chain, we're done. */
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279 | 5774cf98 | Mark McLoughlin | if (!(vring_desc_flags(desc_pa, i) & VRING_DESC_F_NEXT))
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280 | 5774cf98 | Mark McLoughlin | return max;
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281 | 967f97fa | aliguori | |
282 | 967f97fa | aliguori | /* Check they're not leading us off end of descriptors. */
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283 | 5774cf98 | Mark McLoughlin | next = vring_desc_next(desc_pa, i); |
284 | 967f97fa | aliguori | /* Make sure compiler knows to grab that: we don't want it changing! */
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285 | 967f97fa | aliguori | wmb(); |
286 | 967f97fa | aliguori | |
287 | 5774cf98 | Mark McLoughlin | if (next >= max) {
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288 | bb6834cf | aliguori | fprintf(stderr, "Desc next is %u", next);
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289 | bb6834cf | aliguori | exit(1);
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290 | bb6834cf | aliguori | } |
291 | 967f97fa | aliguori | |
292 | 967f97fa | aliguori | return next;
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293 | 967f97fa | aliguori | } |
294 | 967f97fa | aliguori | |
295 | 967f97fa | aliguori | int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes) |
296 | 967f97fa | aliguori | { |
297 | efeea6d0 | Mark McLoughlin | unsigned int idx; |
298 | efeea6d0 | Mark McLoughlin | int total_bufs, in_total, out_total;
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299 | 967f97fa | aliguori | |
300 | 967f97fa | aliguori | idx = vq->last_avail_idx; |
301 | 967f97fa | aliguori | |
302 | efeea6d0 | Mark McLoughlin | total_bufs = in_total = out_total = 0;
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303 | 967f97fa | aliguori | while (virtqueue_num_heads(vq, idx)) {
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304 | efeea6d0 | Mark McLoughlin | unsigned int max, num_bufs, indirect = 0; |
305 | c227f099 | Anthony Liguori | target_phys_addr_t desc_pa; |
306 | 967f97fa | aliguori | int i;
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307 | 967f97fa | aliguori | |
308 | efeea6d0 | Mark McLoughlin | max = vq->vring.num; |
309 | efeea6d0 | Mark McLoughlin | num_bufs = total_bufs; |
310 | 967f97fa | aliguori | i = virtqueue_get_head(vq, idx++); |
311 | efeea6d0 | Mark McLoughlin | desc_pa = vq->vring.desc; |
312 | efeea6d0 | Mark McLoughlin | |
313 | efeea6d0 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
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314 | efeea6d0 | Mark McLoughlin | if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
315 | efeea6d0 | Mark McLoughlin | fprintf(stderr, "Invalid size for indirect buffer table\n");
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316 | efeea6d0 | Mark McLoughlin | exit(1);
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317 | efeea6d0 | Mark McLoughlin | } |
318 | efeea6d0 | Mark McLoughlin | |
319 | efeea6d0 | Mark McLoughlin | /* If we've got too many, that implies a descriptor loop. */
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320 | efeea6d0 | Mark McLoughlin | if (num_bufs >= max) {
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321 | efeea6d0 | Mark McLoughlin | fprintf(stderr, "Looped descriptor");
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322 | efeea6d0 | Mark McLoughlin | exit(1);
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323 | efeea6d0 | Mark McLoughlin | } |
324 | efeea6d0 | Mark McLoughlin | |
325 | efeea6d0 | Mark McLoughlin | /* loop over the indirect descriptor table */
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326 | efeea6d0 | Mark McLoughlin | indirect = 1;
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327 | efeea6d0 | Mark McLoughlin | max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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328 | efeea6d0 | Mark McLoughlin | num_bufs = i = 0;
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329 | efeea6d0 | Mark McLoughlin | desc_pa = vring_desc_addr(desc_pa, i); |
330 | efeea6d0 | Mark McLoughlin | } |
331 | efeea6d0 | Mark McLoughlin | |
332 | 967f97fa | aliguori | do {
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333 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
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334 | 5774cf98 | Mark McLoughlin | if (++num_bufs > max) {
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335 | bb6834cf | aliguori | fprintf(stderr, "Looped descriptor");
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336 | bb6834cf | aliguori | exit(1);
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337 | bb6834cf | aliguori | } |
338 | 967f97fa | aliguori | |
339 | 5774cf98 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
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340 | 967f97fa | aliguori | if (in_bytes > 0 && |
341 | 5774cf98 | Mark McLoughlin | (in_total += vring_desc_len(desc_pa, i)) >= in_bytes) |
342 | 967f97fa | aliguori | return 1; |
343 | 967f97fa | aliguori | } else {
|
344 | 967f97fa | aliguori | if (out_bytes > 0 && |
345 | 5774cf98 | Mark McLoughlin | (out_total += vring_desc_len(desc_pa, i)) >= out_bytes) |
346 | 967f97fa | aliguori | return 1; |
347 | 967f97fa | aliguori | } |
348 | 5774cf98 | Mark McLoughlin | } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
349 | efeea6d0 | Mark McLoughlin | |
350 | efeea6d0 | Mark McLoughlin | if (!indirect)
|
351 | efeea6d0 | Mark McLoughlin | total_bufs = num_bufs; |
352 | efeea6d0 | Mark McLoughlin | else
|
353 | efeea6d0 | Mark McLoughlin | total_bufs++; |
354 | 967f97fa | aliguori | } |
355 | 967f97fa | aliguori | |
356 | 967f97fa | aliguori | return 0; |
357 | 967f97fa | aliguori | } |
358 | 967f97fa | aliguori | |
359 | 967f97fa | aliguori | int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
|
360 | 967f97fa | aliguori | { |
361 | 5774cf98 | Mark McLoughlin | unsigned int i, head, max; |
362 | c227f099 | Anthony Liguori | target_phys_addr_t desc_pa = vq->vring.desc; |
363 | c227f099 | Anthony Liguori | target_phys_addr_t len; |
364 | 967f97fa | aliguori | |
365 | 967f97fa | aliguori | if (!virtqueue_num_heads(vq, vq->last_avail_idx))
|
366 | 967f97fa | aliguori | return 0; |
367 | 967f97fa | aliguori | |
368 | 967f97fa | aliguori | /* When we start there are none of either input nor output. */
|
369 | 967f97fa | aliguori | elem->out_num = elem->in_num = 0;
|
370 | 967f97fa | aliguori | |
371 | 5774cf98 | Mark McLoughlin | max = vq->vring.num; |
372 | 5774cf98 | Mark McLoughlin | |
373 | 967f97fa | aliguori | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
374 | efeea6d0 | Mark McLoughlin | |
375 | efeea6d0 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
376 | efeea6d0 | Mark McLoughlin | if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
377 | efeea6d0 | Mark McLoughlin | fprintf(stderr, "Invalid size for indirect buffer table\n");
|
378 | efeea6d0 | Mark McLoughlin | exit(1);
|
379 | efeea6d0 | Mark McLoughlin | } |
380 | efeea6d0 | Mark McLoughlin | |
381 | efeea6d0 | Mark McLoughlin | /* loop over the indirect descriptor table */
|
382 | efeea6d0 | Mark McLoughlin | max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
|
383 | efeea6d0 | Mark McLoughlin | desc_pa = vring_desc_addr(desc_pa, i); |
384 | efeea6d0 | Mark McLoughlin | i = 0;
|
385 | efeea6d0 | Mark McLoughlin | } |
386 | efeea6d0 | Mark McLoughlin | |
387 | 967f97fa | aliguori | do {
|
388 | 967f97fa | aliguori | struct iovec *sg;
|
389 | 26b258e1 | aliguori | int is_write = 0; |
390 | 967f97fa | aliguori | |
391 | 5774cf98 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
|
392 | 5774cf98 | Mark McLoughlin | elem->in_addr[elem->in_num] = vring_desc_addr(desc_pa, i); |
393 | 967f97fa | aliguori | sg = &elem->in_sg[elem->in_num++]; |
394 | 26b258e1 | aliguori | is_write = 1;
|
395 | 967f97fa | aliguori | } else
|
396 | 967f97fa | aliguori | sg = &elem->out_sg[elem->out_num++]; |
397 | 967f97fa | aliguori | |
398 | 967f97fa | aliguori | /* Grab the first descriptor, and check it's OK. */
|
399 | 5774cf98 | Mark McLoughlin | sg->iov_len = vring_desc_len(desc_pa, i); |
400 | 26b258e1 | aliguori | len = sg->iov_len; |
401 | 967f97fa | aliguori | |
402 | 5774cf98 | Mark McLoughlin | sg->iov_base = cpu_physical_memory_map(vring_desc_addr(desc_pa, i), |
403 | 5774cf98 | Mark McLoughlin | &len, is_write); |
404 | 26b258e1 | aliguori | |
405 | 26b258e1 | aliguori | if (sg->iov_base == NULL || len != sg->iov_len) { |
406 | 26b258e1 | aliguori | fprintf(stderr, "virtio: trying to map MMIO memory\n");
|
407 | bb6834cf | aliguori | exit(1);
|
408 | bb6834cf | aliguori | } |
409 | 967f97fa | aliguori | |
410 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
|
411 | 5774cf98 | Mark McLoughlin | if ((elem->in_num + elem->out_num) > max) {
|
412 | bb6834cf | aliguori | fprintf(stderr, "Looped descriptor");
|
413 | bb6834cf | aliguori | exit(1);
|
414 | bb6834cf | aliguori | } |
415 | 5774cf98 | Mark McLoughlin | } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
416 | 967f97fa | aliguori | |
417 | 967f97fa | aliguori | elem->index = head; |
418 | 967f97fa | aliguori | |
419 | 967f97fa | aliguori | vq->inuse++; |
420 | 967f97fa | aliguori | |
421 | 967f97fa | aliguori | return elem->in_num + elem->out_num;
|
422 | 967f97fa | aliguori | } |
423 | 967f97fa | aliguori | |
424 | 967f97fa | aliguori | /* virtio device */
|
425 | 7055e687 | Michael S. Tsirkin | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
426 | 7055e687 | Michael S. Tsirkin | { |
427 | 7055e687 | Michael S. Tsirkin | if (vdev->binding->notify) {
|
428 | 7055e687 | Michael S. Tsirkin | vdev->binding->notify(vdev->binding_opaque, vector); |
429 | 7055e687 | Michael S. Tsirkin | } |
430 | 7055e687 | Michael S. Tsirkin | } |
431 | 967f97fa | aliguori | |
432 | 53c25cea | Paul Brook | void virtio_update_irq(VirtIODevice *vdev)
|
433 | 967f97fa | aliguori | { |
434 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
435 | 967f97fa | aliguori | } |
436 | 967f97fa | aliguori | |
437 | 53c25cea | Paul Brook | void virtio_reset(void *opaque) |
438 | 967f97fa | aliguori | { |
439 | 967f97fa | aliguori | VirtIODevice *vdev = opaque; |
440 | 967f97fa | aliguori | int i;
|
441 | 967f97fa | aliguori | |
442 | 967f97fa | aliguori | if (vdev->reset)
|
443 | 967f97fa | aliguori | vdev->reset(vdev); |
444 | 967f97fa | aliguori | |
445 | 967f97fa | aliguori | vdev->features = 0;
|
446 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
447 | 967f97fa | aliguori | vdev->status = 0;
|
448 | 967f97fa | aliguori | vdev->isr = 0;
|
449 | 7055e687 | Michael S. Tsirkin | vdev->config_vector = VIRTIO_NO_VECTOR; |
450 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vdev->config_vector); |
451 | 967f97fa | aliguori | |
452 | 967f97fa | aliguori | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
453 | 967f97fa | aliguori | vdev->vq[i].vring.desc = 0;
|
454 | 967f97fa | aliguori | vdev->vq[i].vring.avail = 0;
|
455 | 967f97fa | aliguori | vdev->vq[i].vring.used = 0;
|
456 | 967f97fa | aliguori | vdev->vq[i].last_avail_idx = 0;
|
457 | 53c25cea | Paul Brook | vdev->vq[i].pa = 0;
|
458 | 7055e687 | Michael S. Tsirkin | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
459 | 967f97fa | aliguori | } |
460 | 967f97fa | aliguori | } |
461 | 967f97fa | aliguori | |
462 | 53c25cea | Paul Brook | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
463 | 967f97fa | aliguori | { |
464 | 967f97fa | aliguori | uint8_t val; |
465 | 967f97fa | aliguori | |
466 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
467 | 967f97fa | aliguori | |
468 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
469 | 967f97fa | aliguori | return (uint32_t)-1; |
470 | 967f97fa | aliguori | |
471 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
472 | 967f97fa | aliguori | return val;
|
473 | 967f97fa | aliguori | } |
474 | 967f97fa | aliguori | |
475 | 53c25cea | Paul Brook | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
476 | 967f97fa | aliguori | { |
477 | 967f97fa | aliguori | uint16_t val; |
478 | 967f97fa | aliguori | |
479 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
480 | 967f97fa | aliguori | |
481 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
482 | 967f97fa | aliguori | return (uint32_t)-1; |
483 | 967f97fa | aliguori | |
484 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
485 | 967f97fa | aliguori | return val;
|
486 | 967f97fa | aliguori | } |
487 | 967f97fa | aliguori | |
488 | 53c25cea | Paul Brook | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
489 | 967f97fa | aliguori | { |
490 | 967f97fa | aliguori | uint32_t val; |
491 | 967f97fa | aliguori | |
492 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
493 | 967f97fa | aliguori | |
494 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
495 | 967f97fa | aliguori | return (uint32_t)-1; |
496 | 967f97fa | aliguori | |
497 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
498 | 967f97fa | aliguori | return val;
|
499 | 967f97fa | aliguori | } |
500 | 967f97fa | aliguori | |
501 | 53c25cea | Paul Brook | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
502 | 967f97fa | aliguori | { |
503 | 967f97fa | aliguori | uint8_t val = data; |
504 | 967f97fa | aliguori | |
505 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
506 | 967f97fa | aliguori | return;
|
507 | 967f97fa | aliguori | |
508 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
509 | 967f97fa | aliguori | |
510 | 967f97fa | aliguori | if (vdev->set_config)
|
511 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
512 | 967f97fa | aliguori | } |
513 | 967f97fa | aliguori | |
514 | 53c25cea | Paul Brook | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
515 | 967f97fa | aliguori | { |
516 | 967f97fa | aliguori | uint16_t val = data; |
517 | 967f97fa | aliguori | |
518 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
519 | 967f97fa | aliguori | return;
|
520 | 967f97fa | aliguori | |
521 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
522 | 967f97fa | aliguori | |
523 | 967f97fa | aliguori | if (vdev->set_config)
|
524 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
525 | 967f97fa | aliguori | } |
526 | 967f97fa | aliguori | |
527 | 53c25cea | Paul Brook | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
528 | 967f97fa | aliguori | { |
529 | 967f97fa | aliguori | uint32_t val = data; |
530 | 967f97fa | aliguori | |
531 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
532 | 967f97fa | aliguori | return;
|
533 | 967f97fa | aliguori | |
534 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
535 | 967f97fa | aliguori | |
536 | 967f97fa | aliguori | if (vdev->set_config)
|
537 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
538 | 967f97fa | aliguori | } |
539 | 967f97fa | aliguori | |
540 | c227f099 | Anthony Liguori | void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr) |
541 | 967f97fa | aliguori | { |
542 | 7055e687 | Michael S. Tsirkin | vdev->vq[n].pa = addr; |
543 | 7055e687 | Michael S. Tsirkin | virtqueue_init(&vdev->vq[n]); |
544 | 53c25cea | Paul Brook | } |
545 | 53c25cea | Paul Brook | |
546 | c227f099 | Anthony Liguori | target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
547 | 53c25cea | Paul Brook | { |
548 | 53c25cea | Paul Brook | return vdev->vq[n].pa;
|
549 | 53c25cea | Paul Brook | } |
550 | 53c25cea | Paul Brook | |
551 | 53c25cea | Paul Brook | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
552 | 53c25cea | Paul Brook | { |
553 | 53c25cea | Paul Brook | return vdev->vq[n].vring.num;
|
554 | 53c25cea | Paul Brook | } |
555 | 967f97fa | aliguori | |
556 | 53c25cea | Paul Brook | void virtio_queue_notify(VirtIODevice *vdev, int n) |
557 | 53c25cea | Paul Brook | { |
558 | 53c25cea | Paul Brook | if (n < VIRTIO_PCI_QUEUE_MAX && vdev->vq[n].vring.desc) {
|
559 | 53c25cea | Paul Brook | vdev->vq[n].handle_output(vdev, &vdev->vq[n]); |
560 | 967f97fa | aliguori | } |
561 | 967f97fa | aliguori | } |
562 | 967f97fa | aliguori | |
563 | 7055e687 | Michael S. Tsirkin | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
564 | 7055e687 | Michael S. Tsirkin | { |
565 | 7055e687 | Michael S. Tsirkin | return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector :
|
566 | 7055e687 | Michael S. Tsirkin | VIRTIO_NO_VECTOR; |
567 | 7055e687 | Michael S. Tsirkin | } |
568 | 7055e687 | Michael S. Tsirkin | |
569 | 7055e687 | Michael S. Tsirkin | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) |
570 | 7055e687 | Michael S. Tsirkin | { |
571 | 7055e687 | Michael S. Tsirkin | if (n < VIRTIO_PCI_QUEUE_MAX)
|
572 | 7055e687 | Michael S. Tsirkin | vdev->vq[n].vector = vector; |
573 | 7055e687 | Michael S. Tsirkin | } |
574 | 7055e687 | Michael S. Tsirkin | |
575 | 967f97fa | aliguori | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
576 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *, VirtQueue *))
|
577 | 967f97fa | aliguori | { |
578 | 967f97fa | aliguori | int i;
|
579 | 967f97fa | aliguori | |
580 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
581 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
582 | 967f97fa | aliguori | break;
|
583 | 967f97fa | aliguori | } |
584 | 967f97fa | aliguori | |
585 | 967f97fa | aliguori | if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
586 | 967f97fa | aliguori | abort(); |
587 | 967f97fa | aliguori | |
588 | 967f97fa | aliguori | vdev->vq[i].vring.num = queue_size; |
589 | 967f97fa | aliguori | vdev->vq[i].handle_output = handle_output; |
590 | 967f97fa | aliguori | |
591 | 967f97fa | aliguori | return &vdev->vq[i];
|
592 | 967f97fa | aliguori | } |
593 | 967f97fa | aliguori | |
594 | 967f97fa | aliguori | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
595 | 967f97fa | aliguori | { |
596 | 97b83deb | aliguori | /* Always notify when queue is empty (when feature acknowledge) */
|
597 | 97b83deb | aliguori | if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
598 | 97b83deb | aliguori | (!(vdev->features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
599 | 97b83deb | aliguori | (vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx))) |
600 | 967f97fa | aliguori | return;
|
601 | 967f97fa | aliguori | |
602 | 967f97fa | aliguori | vdev->isr |= 0x01;
|
603 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vq->vector); |
604 | 967f97fa | aliguori | } |
605 | 967f97fa | aliguori | |
606 | 967f97fa | aliguori | void virtio_notify_config(VirtIODevice *vdev)
|
607 | 967f97fa | aliguori | { |
608 | 7625162c | aliguori | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
609 | 7625162c | aliguori | return;
|
610 | 7625162c | aliguori | |
611 | 967f97fa | aliguori | vdev->isr |= 0x03;
|
612 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vdev->config_vector); |
613 | 967f97fa | aliguori | } |
614 | 967f97fa | aliguori | |
615 | 967f97fa | aliguori | void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
616 | 967f97fa | aliguori | { |
617 | 967f97fa | aliguori | int i;
|
618 | 967f97fa | aliguori | |
619 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->save_config)
|
620 | ff24bd58 | Michael S. Tsirkin | vdev->binding->save_config(vdev->binding_opaque, f); |
621 | 967f97fa | aliguori | |
622 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->status); |
623 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->isr); |
624 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->queue_sel); |
625 | 967f97fa | aliguori | qemu_put_be32s(f, &vdev->features); |
626 | 967f97fa | aliguori | qemu_put_be32(f, vdev->config_len); |
627 | 967f97fa | aliguori | qemu_put_buffer(f, vdev->config, vdev->config_len); |
628 | 967f97fa | aliguori | |
629 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
630 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
631 | 967f97fa | aliguori | break;
|
632 | 967f97fa | aliguori | } |
633 | 967f97fa | aliguori | |
634 | 967f97fa | aliguori | qemu_put_be32(f, i); |
635 | 967f97fa | aliguori | |
636 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
637 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
638 | 967f97fa | aliguori | break;
|
639 | 967f97fa | aliguori | |
640 | 967f97fa | aliguori | qemu_put_be32(f, vdev->vq[i].vring.num); |
641 | 53c25cea | Paul Brook | qemu_put_be64(f, vdev->vq[i].pa); |
642 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
643 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->save_queue)
|
644 | ff24bd58 | Michael S. Tsirkin | vdev->binding->save_queue(vdev->binding_opaque, i, f); |
645 | 967f97fa | aliguori | } |
646 | 967f97fa | aliguori | } |
647 | 967f97fa | aliguori | |
648 | ff24bd58 | Michael S. Tsirkin | int virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
649 | 967f97fa | aliguori | { |
650 | ff24bd58 | Michael S. Tsirkin | int num, i, ret;
|
651 | 967f97fa | aliguori | |
652 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->load_config) {
|
653 | ff24bd58 | Michael S. Tsirkin | ret = vdev->binding->load_config(vdev->binding_opaque, f); |
654 | ff24bd58 | Michael S. Tsirkin | if (ret)
|
655 | ff24bd58 | Michael S. Tsirkin | return ret;
|
656 | ff24bd58 | Michael S. Tsirkin | } |
657 | 967f97fa | aliguori | |
658 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->status); |
659 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->isr); |
660 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->queue_sel); |
661 | 967f97fa | aliguori | qemu_get_be32s(f, &vdev->features); |
662 | 967f97fa | aliguori | vdev->config_len = qemu_get_be32(f); |
663 | 967f97fa | aliguori | qemu_get_buffer(f, vdev->config, vdev->config_len); |
664 | 967f97fa | aliguori | |
665 | 967f97fa | aliguori | num = qemu_get_be32(f); |
666 | 967f97fa | aliguori | |
667 | 967f97fa | aliguori | for (i = 0; i < num; i++) { |
668 | 967f97fa | aliguori | vdev->vq[i].vring.num = qemu_get_be32(f); |
669 | 53c25cea | Paul Brook | vdev->vq[i].pa = qemu_get_be64(f); |
670 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
671 | 967f97fa | aliguori | |
672 | 53c25cea | Paul Brook | if (vdev->vq[i].pa) {
|
673 | 53c25cea | Paul Brook | virtqueue_init(&vdev->vq[i]); |
674 | 967f97fa | aliguori | } |
675 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->load_queue) {
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676 | ff24bd58 | Michael S. Tsirkin | ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); |
677 | ff24bd58 | Michael S. Tsirkin | if (ret)
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678 | ff24bd58 | Michael S. Tsirkin | return ret;
|
679 | 7055e687 | Michael S. Tsirkin | } |
680 | 967f97fa | aliguori | } |
681 | 967f97fa | aliguori | |
682 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
683 | ff24bd58 | Michael S. Tsirkin | return 0; |
684 | 967f97fa | aliguori | } |
685 | 967f97fa | aliguori | |
686 | b946a153 | aliguori | void virtio_cleanup(VirtIODevice *vdev)
|
687 | b946a153 | aliguori | { |
688 | b946a153 | aliguori | if (vdev->config)
|
689 | b946a153 | aliguori | qemu_free(vdev->config); |
690 | b946a153 | aliguori | qemu_free(vdev->vq); |
691 | b946a153 | aliguori | } |
692 | b946a153 | aliguori | |
693 | 53c25cea | Paul Brook | VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, |
694 | 53c25cea | Paul Brook | size_t config_size, size_t struct_size) |
695 | 967f97fa | aliguori | { |
696 | 967f97fa | aliguori | VirtIODevice *vdev; |
697 | b8193adb | Michael S. Tsirkin | int i;
|
698 | 967f97fa | aliguori | |
699 | 53c25cea | Paul Brook | vdev = qemu_mallocz(struct_size); |
700 | 967f97fa | aliguori | |
701 | 53c25cea | Paul Brook | vdev->device_id = device_id; |
702 | 967f97fa | aliguori | vdev->status = 0;
|
703 | 967f97fa | aliguori | vdev->isr = 0;
|
704 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
705 | 7055e687 | Michael S. Tsirkin | vdev->config_vector = VIRTIO_NO_VECTOR; |
706 | 967f97fa | aliguori | vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
707 | b8193adb | Michael S. Tsirkin | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) |
708 | b8193adb | Michael S. Tsirkin | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
709 | 967f97fa | aliguori | |
710 | 967f97fa | aliguori | vdev->name = name; |
711 | 967f97fa | aliguori | vdev->config_len = config_size; |
712 | 967f97fa | aliguori | if (vdev->config_len)
|
713 | 967f97fa | aliguori | vdev->config = qemu_mallocz(config_size); |
714 | 967f97fa | aliguori | else
|
715 | 967f97fa | aliguori | vdev->config = NULL;
|
716 | 967f97fa | aliguori | |
717 | 967f97fa | aliguori | return vdev;
|
718 | 967f97fa | aliguori | } |
719 | 53c25cea | Paul Brook | |
720 | 53c25cea | Paul Brook | void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, |
721 | 53c25cea | Paul Brook | void *opaque)
|
722 | 53c25cea | Paul Brook | { |
723 | 53c25cea | Paul Brook | vdev->binding = binding; |
724 | 53c25cea | Paul Brook | vdev->binding_opaque = opaque; |
725 | 53c25cea | Paul Brook | } |