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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 | 64979a4d | Stefan Hajnoczi | #include "trace.h" |
17 | ce67ed65 | Stefan Hajnoczi | #include "qemu-error.h" |
18 | 967f97fa | aliguori | #include "virtio.h" |
19 | b90d2f35 | David Gibson | #include "qemu-barrier.h" |
20 | 967f97fa | aliguori | |
21 | f46f15bc | aliguori | /* The alignment to use between consumer and producer parts of vring.
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22 | f46f15bc | aliguori | * x86 pagesize again. */
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23 | f46f15bc | aliguori | #define VIRTIO_PCI_VRING_ALIGN 4096 |
24 | f46f15bc | aliguori | |
25 | 967f97fa | aliguori | typedef struct VRingDesc |
26 | 967f97fa | aliguori | { |
27 | 967f97fa | aliguori | uint64_t addr; |
28 | 967f97fa | aliguori | uint32_t len; |
29 | 967f97fa | aliguori | uint16_t flags; |
30 | 967f97fa | aliguori | uint16_t next; |
31 | 967f97fa | aliguori | } VRingDesc; |
32 | 967f97fa | aliguori | |
33 | 967f97fa | aliguori | typedef struct VRingAvail |
34 | 967f97fa | aliguori | { |
35 | 967f97fa | aliguori | uint16_t flags; |
36 | 967f97fa | aliguori | uint16_t idx; |
37 | 967f97fa | aliguori | uint16_t ring[0];
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38 | 967f97fa | aliguori | } VRingAvail; |
39 | 967f97fa | aliguori | |
40 | 967f97fa | aliguori | typedef struct VRingUsedElem |
41 | 967f97fa | aliguori | { |
42 | 967f97fa | aliguori | uint32_t id; |
43 | 967f97fa | aliguori | uint32_t len; |
44 | 967f97fa | aliguori | } VRingUsedElem; |
45 | 967f97fa | aliguori | |
46 | 967f97fa | aliguori | typedef struct VRingUsed |
47 | 967f97fa | aliguori | { |
48 | 967f97fa | aliguori | uint16_t flags; |
49 | 967f97fa | aliguori | uint16_t idx; |
50 | 967f97fa | aliguori | VRingUsedElem ring[0];
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51 | 967f97fa | aliguori | } VRingUsed; |
52 | 967f97fa | aliguori | |
53 | 967f97fa | aliguori | typedef struct VRing |
54 | 967f97fa | aliguori | { |
55 | 967f97fa | aliguori | unsigned int num; |
56 | c227f099 | Anthony Liguori | target_phys_addr_t desc; |
57 | c227f099 | Anthony Liguori | target_phys_addr_t avail; |
58 | c227f099 | Anthony Liguori | target_phys_addr_t used; |
59 | 967f97fa | aliguori | } VRing; |
60 | 967f97fa | aliguori | |
61 | 967f97fa | aliguori | struct VirtQueue
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62 | 967f97fa | aliguori | { |
63 | 967f97fa | aliguori | VRing vring; |
64 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
65 | 967f97fa | aliguori | uint16_t last_avail_idx; |
66 | bcbabae8 | Michael S. Tsirkin | /* Last used index value we have signalled on */
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67 | bcbabae8 | Michael S. Tsirkin | uint16_t signalled_used; |
68 | bcbabae8 | Michael S. Tsirkin | |
69 | bcbabae8 | Michael S. Tsirkin | /* Last used index value we have signalled on */
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70 | bcbabae8 | Michael S. Tsirkin | bool signalled_used_valid;
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71 | bcbabae8 | Michael S. Tsirkin | |
72 | bcbabae8 | Michael S. Tsirkin | /* Notification enabled? */
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73 | bcbabae8 | Michael S. Tsirkin | bool notification;
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74 | bcbabae8 | Michael S. Tsirkin | |
75 | 967f97fa | aliguori | int inuse;
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76 | bcbabae8 | Michael S. Tsirkin | |
77 | 7055e687 | Michael S. Tsirkin | uint16_t vector; |
78 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
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79 | 1cbdabe2 | Michael S. Tsirkin | VirtIODevice *vdev; |
80 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier guest_notifier; |
81 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier host_notifier; |
82 | 967f97fa | aliguori | }; |
83 | 967f97fa | aliguori | |
84 | 967f97fa | aliguori | /* virt queue functions */
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85 | 53c25cea | Paul Brook | static void virtqueue_init(VirtQueue *vq) |
86 | 967f97fa | aliguori | { |
87 | c227f099 | Anthony Liguori | target_phys_addr_t pa = vq->pa; |
88 | 53c25cea | Paul Brook | |
89 | 967f97fa | aliguori | vq->vring.desc = pa; |
90 | 967f97fa | aliguori | vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
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91 | f46f15bc | aliguori | vq->vring.used = vring_align(vq->vring.avail + |
92 | f46f15bc | aliguori | offsetof(VRingAvail, ring[vq->vring.num]), |
93 | f46f15bc | aliguori | VIRTIO_PCI_VRING_ALIGN); |
94 | 967f97fa | aliguori | } |
95 | 967f97fa | aliguori | |
96 | c227f099 | Anthony Liguori | static inline uint64_t vring_desc_addr(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, addr);
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100 | 967f97fa | aliguori | return ldq_phys(pa);
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101 | 967f97fa | aliguori | } |
102 | 967f97fa | aliguori | |
103 | c227f099 | Anthony Liguori | static inline uint32_t vring_desc_len(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, len);
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107 | 967f97fa | aliguori | return ldl_phys(pa);
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108 | 967f97fa | aliguori | } |
109 | 967f97fa | aliguori | |
110 | c227f099 | Anthony Liguori | static inline uint16_t vring_desc_flags(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, flags);
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114 | 967f97fa | aliguori | return lduw_phys(pa);
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115 | 967f97fa | aliguori | } |
116 | 967f97fa | aliguori | |
117 | c227f099 | Anthony Liguori | static inline uint16_t vring_desc_next(target_phys_addr_t desc_pa, int i) |
118 | 967f97fa | aliguori | { |
119 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
120 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
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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_flags(VirtQueue *vq) |
125 | 967f97fa | aliguori | { |
126 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
127 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
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_idx(VirtQueue *vq) |
132 | 967f97fa | aliguori | { |
133 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
134 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
135 | 967f97fa | aliguori | return lduw_phys(pa);
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136 | 967f97fa | aliguori | } |
137 | 967f97fa | aliguori | |
138 | 967f97fa | aliguori | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
139 | 967f97fa | aliguori | { |
140 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
141 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
142 | 967f97fa | aliguori | return lduw_phys(pa);
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143 | 967f97fa | aliguori | } |
144 | 967f97fa | aliguori | |
145 | bcbabae8 | Michael S. Tsirkin | static inline uint16_t vring_used_event(VirtQueue *vq) |
146 | bcbabae8 | Michael S. Tsirkin | { |
147 | bcbabae8 | Michael S. Tsirkin | return vring_avail_ring(vq, vq->vring.num);
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148 | bcbabae8 | Michael S. Tsirkin | } |
149 | bcbabae8 | Michael S. Tsirkin | |
150 | 967f97fa | aliguori | static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
151 | 967f97fa | aliguori | { |
152 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
153 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
154 | 967f97fa | aliguori | stl_phys(pa, val); |
155 | 967f97fa | aliguori | } |
156 | 967f97fa | aliguori | |
157 | 967f97fa | aliguori | static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) |
158 | 967f97fa | aliguori | { |
159 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
160 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
161 | 967f97fa | aliguori | stl_phys(pa, val); |
162 | 967f97fa | aliguori | } |
163 | 967f97fa | aliguori | |
164 | 967f97fa | aliguori | static uint16_t vring_used_idx(VirtQueue *vq)
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165 | 967f97fa | aliguori | { |
166 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
167 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
168 | 967f97fa | aliguori | return lduw_phys(pa);
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169 | 967f97fa | aliguori | } |
170 | 967f97fa | aliguori | |
171 | bcbabae8 | Michael S. Tsirkin | static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
172 | 967f97fa | aliguori | { |
173 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
174 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
175 | bcbabae8 | Michael S. Tsirkin | stw_phys(pa, val); |
176 | 967f97fa | aliguori | } |
177 | 967f97fa | aliguori | |
178 | 967f97fa | aliguori | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
179 | 967f97fa | aliguori | { |
180 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
181 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
182 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) | mask); |
183 | 967f97fa | aliguori | } |
184 | 967f97fa | aliguori | |
185 | 967f97fa | aliguori | static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
186 | 967f97fa | aliguori | { |
187 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
188 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
189 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) & ~mask); |
190 | 967f97fa | aliguori | } |
191 | 967f97fa | aliguori | |
192 | bcbabae8 | Michael S. Tsirkin | static inline void vring_avail_event(VirtQueue *vq, uint16_t val) |
193 | bcbabae8 | Michael S. Tsirkin | { |
194 | bcbabae8 | Michael S. Tsirkin | target_phys_addr_t pa; |
195 | bcbabae8 | Michael S. Tsirkin | if (!vq->notification) {
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196 | bcbabae8 | Michael S. Tsirkin | return;
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197 | bcbabae8 | Michael S. Tsirkin | } |
198 | bcbabae8 | Michael S. Tsirkin | pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]); |
199 | bcbabae8 | Michael S. Tsirkin | stw_phys(pa, val); |
200 | bcbabae8 | Michael S. Tsirkin | } |
201 | bcbabae8 | Michael S. Tsirkin | |
202 | 967f97fa | aliguori | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
203 | 967f97fa | aliguori | { |
204 | bcbabae8 | Michael S. Tsirkin | vq->notification = enable; |
205 | bcbabae8 | Michael S. Tsirkin | if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { |
206 | bcbabae8 | Michael S. Tsirkin | vring_avail_event(vq, vring_avail_idx(vq)); |
207 | bcbabae8 | Michael S. Tsirkin | } else if (enable) { |
208 | 967f97fa | aliguori | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
209 | bcbabae8 | Michael S. Tsirkin | } else {
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210 | 967f97fa | aliguori | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
211 | bcbabae8 | Michael S. Tsirkin | } |
212 | 92045d80 | Michael S. Tsirkin | if (enable) {
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213 | 92045d80 | Michael S. Tsirkin | /* Expose avail event/used flags before caller checks the avail idx. */
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214 | 92045d80 | Michael S. Tsirkin | smp_mb(); |
215 | 92045d80 | Michael S. Tsirkin | } |
216 | 967f97fa | aliguori | } |
217 | 967f97fa | aliguori | |
218 | 967f97fa | aliguori | int virtio_queue_ready(VirtQueue *vq)
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219 | 967f97fa | aliguori | { |
220 | 967f97fa | aliguori | return vq->vring.avail != 0; |
221 | 967f97fa | aliguori | } |
222 | 967f97fa | aliguori | |
223 | 967f97fa | aliguori | int virtio_queue_empty(VirtQueue *vq)
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224 | 967f97fa | aliguori | { |
225 | 967f97fa | aliguori | return vring_avail_idx(vq) == vq->last_avail_idx;
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226 | 967f97fa | aliguori | } |
227 | 967f97fa | aliguori | |
228 | 967f97fa | aliguori | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
229 | 967f97fa | aliguori | unsigned int len, unsigned int idx) |
230 | 967f97fa | aliguori | { |
231 | 967f97fa | aliguori | unsigned int offset; |
232 | 967f97fa | aliguori | int i;
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233 | 967f97fa | aliguori | |
234 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_fill(vq, elem, len, idx); |
235 | 64979a4d | Stefan Hajnoczi | |
236 | 967f97fa | aliguori | offset = 0;
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237 | 967f97fa | aliguori | for (i = 0; i < elem->in_num; i++) { |
238 | 967f97fa | aliguori | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
239 | 967f97fa | aliguori | |
240 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
241 | 26b258e1 | aliguori | elem->in_sg[i].iov_len, |
242 | 26b258e1 | aliguori | 1, size);
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243 | 967f97fa | aliguori | |
244 | 26b258e1 | aliguori | offset += elem->in_sg[i].iov_len; |
245 | 967f97fa | aliguori | } |
246 | 967f97fa | aliguori | |
247 | 26b258e1 | aliguori | for (i = 0; i < elem->out_num; i++) |
248 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, |
249 | 26b258e1 | aliguori | elem->out_sg[i].iov_len, |
250 | 26b258e1 | aliguori | 0, elem->out_sg[i].iov_len);
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251 | 26b258e1 | aliguori | |
252 | 967f97fa | aliguori | idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
253 | 967f97fa | aliguori | |
254 | 967f97fa | aliguori | /* Get a pointer to the next entry in the used ring. */
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255 | 967f97fa | aliguori | vring_used_ring_id(vq, idx, elem->index); |
256 | 967f97fa | aliguori | vring_used_ring_len(vq, idx, len); |
257 | 967f97fa | aliguori | } |
258 | 967f97fa | aliguori | |
259 | 967f97fa | aliguori | void virtqueue_flush(VirtQueue *vq, unsigned int count) |
260 | 967f97fa | aliguori | { |
261 | bcbabae8 | Michael S. Tsirkin | uint16_t old, new; |
262 | 967f97fa | aliguori | /* Make sure buffer is written before we update index. */
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263 | b90d2f35 | David Gibson | smp_wmb(); |
264 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_flush(vq, count); |
265 | bcbabae8 | Michael S. Tsirkin | old = vring_used_idx(vq); |
266 | bcbabae8 | Michael S. Tsirkin | new = old + count; |
267 | bcbabae8 | Michael S. Tsirkin | vring_used_idx_set(vq, new); |
268 | 967f97fa | aliguori | vq->inuse -= count; |
269 | bcbabae8 | Michael S. Tsirkin | if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old)))
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270 | bcbabae8 | Michael S. Tsirkin | vq->signalled_used_valid = false;
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271 | 967f97fa | aliguori | } |
272 | 967f97fa | aliguori | |
273 | 967f97fa | aliguori | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
274 | 967f97fa | aliguori | unsigned int len) |
275 | 967f97fa | aliguori | { |
276 | 967f97fa | aliguori | virtqueue_fill(vq, elem, len, 0);
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277 | 967f97fa | aliguori | virtqueue_flush(vq, 1);
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278 | 967f97fa | aliguori | } |
279 | 967f97fa | aliguori | |
280 | 967f97fa | aliguori | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
281 | 967f97fa | aliguori | { |
282 | 967f97fa | aliguori | uint16_t num_heads = vring_avail_idx(vq) - idx; |
283 | 967f97fa | aliguori | |
284 | 967f97fa | aliguori | /* Check it isn't doing very strange things with descriptor numbers. */
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285 | bb6834cf | aliguori | if (num_heads > vq->vring.num) {
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286 | ce67ed65 | Stefan Hajnoczi | error_report("Guest moved used index from %u to %u",
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287 | ce67ed65 | Stefan Hajnoczi | idx, vring_avail_idx(vq)); |
288 | bb6834cf | aliguori | exit(1);
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289 | bb6834cf | aliguori | } |
290 | a821ce59 | Michael S. Tsirkin | /* On success, callers read a descriptor at vq->last_avail_idx.
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291 | a821ce59 | Michael S. Tsirkin | * Make sure descriptor read does not bypass avail index read. */
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292 | a821ce59 | Michael S. Tsirkin | if (num_heads) {
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293 | a821ce59 | Michael S. Tsirkin | smp_rmb(); |
294 | a821ce59 | Michael S. Tsirkin | } |
295 | 967f97fa | aliguori | |
296 | 967f97fa | aliguori | return num_heads;
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297 | 967f97fa | aliguori | } |
298 | 967f97fa | aliguori | |
299 | 967f97fa | aliguori | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) |
300 | 967f97fa | aliguori | { |
301 | 967f97fa | aliguori | unsigned int head; |
302 | 967f97fa | aliguori | |
303 | 967f97fa | aliguori | /* Grab the next descriptor number they're advertising, and increment
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304 | 967f97fa | aliguori | * the index we've seen. */
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305 | 967f97fa | aliguori | head = vring_avail_ring(vq, idx % vq->vring.num); |
306 | 967f97fa | aliguori | |
307 | 967f97fa | aliguori | /* If their number is silly, that's a fatal mistake. */
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308 | bb6834cf | aliguori | if (head >= vq->vring.num) {
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309 | ce67ed65 | Stefan Hajnoczi | error_report("Guest says index %u is available", head);
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310 | bb6834cf | aliguori | exit(1);
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311 | bb6834cf | aliguori | } |
312 | 967f97fa | aliguori | |
313 | 967f97fa | aliguori | return head;
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314 | 967f97fa | aliguori | } |
315 | 967f97fa | aliguori | |
316 | c227f099 | Anthony Liguori | static unsigned virtqueue_next_desc(target_phys_addr_t desc_pa, |
317 | 5774cf98 | Mark McLoughlin | unsigned int i, unsigned int max) |
318 | 967f97fa | aliguori | { |
319 | 967f97fa | aliguori | unsigned int next; |
320 | 967f97fa | aliguori | |
321 | 967f97fa | aliguori | /* If this descriptor says it doesn't chain, we're done. */
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322 | 5774cf98 | Mark McLoughlin | if (!(vring_desc_flags(desc_pa, i) & VRING_DESC_F_NEXT))
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323 | 5774cf98 | Mark McLoughlin | return max;
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324 | 967f97fa | aliguori | |
325 | 967f97fa | aliguori | /* Check they're not leading us off end of descriptors. */
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326 | 5774cf98 | Mark McLoughlin | next = vring_desc_next(desc_pa, i); |
327 | 967f97fa | aliguori | /* Make sure compiler knows to grab that: we don't want it changing! */
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328 | b90d2f35 | David Gibson | smp_wmb(); |
329 | 967f97fa | aliguori | |
330 | 5774cf98 | Mark McLoughlin | if (next >= max) {
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331 | ce67ed65 | Stefan Hajnoczi | error_report("Desc next is %u", next);
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332 | bb6834cf | aliguori | exit(1);
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333 | bb6834cf | aliguori | } |
334 | 967f97fa | aliguori | |
335 | 967f97fa | aliguori | return next;
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336 | 967f97fa | aliguori | } |
337 | 967f97fa | aliguori | |
338 | 967f97fa | aliguori | int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes) |
339 | 967f97fa | aliguori | { |
340 | efeea6d0 | Mark McLoughlin | unsigned int idx; |
341 | efeea6d0 | Mark McLoughlin | int total_bufs, in_total, out_total;
|
342 | 967f97fa | aliguori | |
343 | 967f97fa | aliguori | idx = vq->last_avail_idx; |
344 | 967f97fa | aliguori | |
345 | efeea6d0 | Mark McLoughlin | total_bufs = in_total = out_total = 0;
|
346 | 967f97fa | aliguori | while (virtqueue_num_heads(vq, idx)) {
|
347 | efeea6d0 | Mark McLoughlin | unsigned int max, num_bufs, indirect = 0; |
348 | c227f099 | Anthony Liguori | target_phys_addr_t desc_pa; |
349 | 967f97fa | aliguori | int i;
|
350 | 967f97fa | aliguori | |
351 | efeea6d0 | Mark McLoughlin | max = vq->vring.num; |
352 | efeea6d0 | Mark McLoughlin | num_bufs = total_bufs; |
353 | 967f97fa | aliguori | i = virtqueue_get_head(vq, idx++); |
354 | efeea6d0 | Mark McLoughlin | desc_pa = vq->vring.desc; |
355 | efeea6d0 | Mark McLoughlin | |
356 | efeea6d0 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
357 | efeea6d0 | Mark McLoughlin | if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
358 | ce67ed65 | Stefan Hajnoczi | error_report("Invalid size for indirect buffer table");
|
359 | efeea6d0 | Mark McLoughlin | exit(1);
|
360 | efeea6d0 | Mark McLoughlin | } |
361 | efeea6d0 | Mark McLoughlin | |
362 | efeea6d0 | Mark McLoughlin | /* If we've got too many, that implies a descriptor loop. */
|
363 | efeea6d0 | Mark McLoughlin | if (num_bufs >= max) {
|
364 | ce67ed65 | Stefan Hajnoczi | error_report("Looped descriptor");
|
365 | efeea6d0 | Mark McLoughlin | exit(1);
|
366 | efeea6d0 | Mark McLoughlin | } |
367 | efeea6d0 | Mark McLoughlin | |
368 | efeea6d0 | Mark McLoughlin | /* loop over the indirect descriptor table */
|
369 | efeea6d0 | Mark McLoughlin | indirect = 1;
|
370 | efeea6d0 | Mark McLoughlin | max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
|
371 | efeea6d0 | Mark McLoughlin | num_bufs = i = 0;
|
372 | efeea6d0 | Mark McLoughlin | desc_pa = vring_desc_addr(desc_pa, i); |
373 | efeea6d0 | Mark McLoughlin | } |
374 | efeea6d0 | Mark McLoughlin | |
375 | 967f97fa | aliguori | do {
|
376 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
|
377 | 5774cf98 | Mark McLoughlin | if (++num_bufs > max) {
|
378 | ce67ed65 | Stefan Hajnoczi | error_report("Looped descriptor");
|
379 | bb6834cf | aliguori | exit(1);
|
380 | bb6834cf | aliguori | } |
381 | 967f97fa | aliguori | |
382 | 5774cf98 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
|
383 | 967f97fa | aliguori | if (in_bytes > 0 && |
384 | 5774cf98 | Mark McLoughlin | (in_total += vring_desc_len(desc_pa, i)) >= in_bytes) |
385 | 967f97fa | aliguori | return 1; |
386 | 967f97fa | aliguori | } else {
|
387 | 967f97fa | aliguori | if (out_bytes > 0 && |
388 | 5774cf98 | Mark McLoughlin | (out_total += vring_desc_len(desc_pa, i)) >= out_bytes) |
389 | 967f97fa | aliguori | return 1; |
390 | 967f97fa | aliguori | } |
391 | 5774cf98 | Mark McLoughlin | } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
392 | efeea6d0 | Mark McLoughlin | |
393 | efeea6d0 | Mark McLoughlin | if (!indirect)
|
394 | efeea6d0 | Mark McLoughlin | total_bufs = num_bufs; |
395 | efeea6d0 | Mark McLoughlin | else
|
396 | efeea6d0 | Mark McLoughlin | total_bufs++; |
397 | 967f97fa | aliguori | } |
398 | 967f97fa | aliguori | |
399 | 967f97fa | aliguori | return 0; |
400 | 967f97fa | aliguori | } |
401 | 967f97fa | aliguori | |
402 | 42fb2e07 | Kevin Wolf | void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr, |
403 | 42fb2e07 | Kevin Wolf | size_t num_sg, int is_write)
|
404 | 42fb2e07 | Kevin Wolf | { |
405 | 42fb2e07 | Kevin Wolf | unsigned int i; |
406 | 42fb2e07 | Kevin Wolf | target_phys_addr_t len; |
407 | 42fb2e07 | Kevin Wolf | |
408 | 42fb2e07 | Kevin Wolf | for (i = 0; i < num_sg; i++) { |
409 | 42fb2e07 | Kevin Wolf | len = sg[i].iov_len; |
410 | 42fb2e07 | Kevin Wolf | sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); |
411 | 42fb2e07 | Kevin Wolf | if (sg[i].iov_base == NULL || len != sg[i].iov_len) { |
412 | ce67ed65 | Stefan Hajnoczi | error_report("virtio: trying to map MMIO memory");
|
413 | 42fb2e07 | Kevin Wolf | exit(1);
|
414 | 42fb2e07 | Kevin Wolf | } |
415 | 42fb2e07 | Kevin Wolf | } |
416 | 42fb2e07 | Kevin Wolf | } |
417 | 42fb2e07 | Kevin Wolf | |
418 | 967f97fa | aliguori | int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
|
419 | 967f97fa | aliguori | { |
420 | 5774cf98 | Mark McLoughlin | unsigned int i, head, max; |
421 | c227f099 | Anthony Liguori | target_phys_addr_t desc_pa = vq->vring.desc; |
422 | 967f97fa | aliguori | |
423 | 967f97fa | aliguori | if (!virtqueue_num_heads(vq, vq->last_avail_idx))
|
424 | 967f97fa | aliguori | return 0; |
425 | 967f97fa | aliguori | |
426 | 967f97fa | aliguori | /* When we start there are none of either input nor output. */
|
427 | 967f97fa | aliguori | elem->out_num = elem->in_num = 0;
|
428 | 967f97fa | aliguori | |
429 | 5774cf98 | Mark McLoughlin | max = vq->vring.num; |
430 | 5774cf98 | Mark McLoughlin | |
431 | 967f97fa | aliguori | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
432 | bcbabae8 | Michael S. Tsirkin | if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { |
433 | bcbabae8 | Michael S. Tsirkin | vring_avail_event(vq, vring_avail_idx(vq)); |
434 | bcbabae8 | Michael S. Tsirkin | } |
435 | efeea6d0 | Mark McLoughlin | |
436 | efeea6d0 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
437 | efeea6d0 | Mark McLoughlin | if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
438 | ce67ed65 | Stefan Hajnoczi | error_report("Invalid size for indirect buffer table");
|
439 | efeea6d0 | Mark McLoughlin | exit(1);
|
440 | efeea6d0 | Mark McLoughlin | } |
441 | efeea6d0 | Mark McLoughlin | |
442 | efeea6d0 | Mark McLoughlin | /* loop over the indirect descriptor table */
|
443 | efeea6d0 | Mark McLoughlin | max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
|
444 | efeea6d0 | Mark McLoughlin | desc_pa = vring_desc_addr(desc_pa, i); |
445 | efeea6d0 | Mark McLoughlin | i = 0;
|
446 | efeea6d0 | Mark McLoughlin | } |
447 | efeea6d0 | Mark McLoughlin | |
448 | 42fb2e07 | Kevin Wolf | /* Collect all the descriptors */
|
449 | 967f97fa | aliguori | do {
|
450 | 967f97fa | aliguori | struct iovec *sg;
|
451 | 967f97fa | aliguori | |
452 | 5774cf98 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
|
453 | c8eac1cf | Michael S. Tsirkin | if (elem->in_num >= ARRAY_SIZE(elem->in_sg)) {
|
454 | c8eac1cf | Michael S. Tsirkin | error_report("Too many write descriptors in indirect table");
|
455 | c8eac1cf | Michael S. Tsirkin | exit(1);
|
456 | c8eac1cf | Michael S. Tsirkin | } |
457 | 5774cf98 | Mark McLoughlin | elem->in_addr[elem->in_num] = vring_desc_addr(desc_pa, i); |
458 | 967f97fa | aliguori | sg = &elem->in_sg[elem->in_num++]; |
459 | 42fb2e07 | Kevin Wolf | } else {
|
460 | c8eac1cf | Michael S. Tsirkin | if (elem->out_num >= ARRAY_SIZE(elem->out_sg)) {
|
461 | c8eac1cf | Michael S. Tsirkin | error_report("Too many read descriptors in indirect table");
|
462 | c8eac1cf | Michael S. Tsirkin | exit(1);
|
463 | c8eac1cf | Michael S. Tsirkin | } |
464 | 42fb2e07 | Kevin Wolf | elem->out_addr[elem->out_num] = vring_desc_addr(desc_pa, i); |
465 | 967f97fa | aliguori | sg = &elem->out_sg[elem->out_num++]; |
466 | 42fb2e07 | Kevin Wolf | } |
467 | 967f97fa | aliguori | |
468 | 5774cf98 | Mark McLoughlin | sg->iov_len = vring_desc_len(desc_pa, i); |
469 | 967f97fa | aliguori | |
470 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
|
471 | 5774cf98 | Mark McLoughlin | if ((elem->in_num + elem->out_num) > max) {
|
472 | ce67ed65 | Stefan Hajnoczi | error_report("Looped descriptor");
|
473 | bb6834cf | aliguori | exit(1);
|
474 | bb6834cf | aliguori | } |
475 | 5774cf98 | Mark McLoughlin | } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
476 | 967f97fa | aliguori | |
477 | 42fb2e07 | Kevin Wolf | /* Now map what we have collected */
|
478 | 42fb2e07 | Kevin Wolf | virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1);
|
479 | 42fb2e07 | Kevin Wolf | virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0);
|
480 | 42fb2e07 | Kevin Wolf | |
481 | 967f97fa | aliguori | elem->index = head; |
482 | 967f97fa | aliguori | |
483 | 967f97fa | aliguori | vq->inuse++; |
484 | 967f97fa | aliguori | |
485 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
486 | 967f97fa | aliguori | return elem->in_num + elem->out_num;
|
487 | 967f97fa | aliguori | } |
488 | 967f97fa | aliguori | |
489 | 967f97fa | aliguori | /* virtio device */
|
490 | 7055e687 | Michael S. Tsirkin | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
491 | 7055e687 | Michael S. Tsirkin | { |
492 | 7055e687 | Michael S. Tsirkin | if (vdev->binding->notify) {
|
493 | 7055e687 | Michael S. Tsirkin | vdev->binding->notify(vdev->binding_opaque, vector); |
494 | 7055e687 | Michael S. Tsirkin | } |
495 | 7055e687 | Michael S. Tsirkin | } |
496 | 967f97fa | aliguori | |
497 | 53c25cea | Paul Brook | void virtio_update_irq(VirtIODevice *vdev)
|
498 | 967f97fa | aliguori | { |
499 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
500 | 967f97fa | aliguori | } |
501 | 967f97fa | aliguori | |
502 | 4e1837f8 | Stefan Hajnoczi | void virtio_set_status(VirtIODevice *vdev, uint8_t val)
|
503 | 4e1837f8 | Stefan Hajnoczi | { |
504 | 4e1837f8 | Stefan Hajnoczi | trace_virtio_set_status(vdev, val); |
505 | 4e1837f8 | Stefan Hajnoczi | |
506 | 4e1837f8 | Stefan Hajnoczi | if (vdev->set_status) {
|
507 | 4e1837f8 | Stefan Hajnoczi | vdev->set_status(vdev, val); |
508 | 4e1837f8 | Stefan Hajnoczi | } |
509 | 4e1837f8 | Stefan Hajnoczi | vdev->status = val; |
510 | 4e1837f8 | Stefan Hajnoczi | } |
511 | 4e1837f8 | Stefan Hajnoczi | |
512 | 53c25cea | Paul Brook | void virtio_reset(void *opaque) |
513 | 967f97fa | aliguori | { |
514 | 967f97fa | aliguori | VirtIODevice *vdev = opaque; |
515 | 967f97fa | aliguori | int i;
|
516 | 967f97fa | aliguori | |
517 | e0c472d8 | Michael S. Tsirkin | virtio_set_status(vdev, 0);
|
518 | e0c472d8 | Michael S. Tsirkin | |
519 | 967f97fa | aliguori | if (vdev->reset)
|
520 | 967f97fa | aliguori | vdev->reset(vdev); |
521 | 967f97fa | aliguori | |
522 | 704a76fc | Michael S. Tsirkin | vdev->guest_features = 0;
|
523 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
524 | 967f97fa | aliguori | vdev->status = 0;
|
525 | 967f97fa | aliguori | vdev->isr = 0;
|
526 | 7055e687 | Michael S. Tsirkin | vdev->config_vector = VIRTIO_NO_VECTOR; |
527 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vdev->config_vector); |
528 | 967f97fa | aliguori | |
529 | 967f97fa | aliguori | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
530 | 967f97fa | aliguori | vdev->vq[i].vring.desc = 0;
|
531 | 967f97fa | aliguori | vdev->vq[i].vring.avail = 0;
|
532 | 967f97fa | aliguori | vdev->vq[i].vring.used = 0;
|
533 | 967f97fa | aliguori | vdev->vq[i].last_avail_idx = 0;
|
534 | 53c25cea | Paul Brook | vdev->vq[i].pa = 0;
|
535 | 7055e687 | Michael S. Tsirkin | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
536 | bcbabae8 | Michael S. Tsirkin | vdev->vq[i].signalled_used = 0;
|
537 | bcbabae8 | Michael S. Tsirkin | vdev->vq[i].signalled_used_valid = false;
|
538 | bcbabae8 | Michael S. Tsirkin | vdev->vq[i].notification = true;
|
539 | 967f97fa | aliguori | } |
540 | 967f97fa | aliguori | } |
541 | 967f97fa | aliguori | |
542 | 53c25cea | Paul Brook | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
543 | 967f97fa | aliguori | { |
544 | 967f97fa | aliguori | uint8_t val; |
545 | 967f97fa | aliguori | |
546 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
547 | 967f97fa | aliguori | |
548 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
549 | 967f97fa | aliguori | return (uint32_t)-1; |
550 | 967f97fa | aliguori | |
551 | 06dbfc6f | Alexander Graf | val = ldub_p(vdev->config + addr); |
552 | 967f97fa | aliguori | return val;
|
553 | 967f97fa | aliguori | } |
554 | 967f97fa | aliguori | |
555 | 53c25cea | Paul Brook | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
556 | 967f97fa | aliguori | { |
557 | 967f97fa | aliguori | uint16_t val; |
558 | 967f97fa | aliguori | |
559 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
560 | 967f97fa | aliguori | |
561 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
562 | 967f97fa | aliguori | return (uint32_t)-1; |
563 | 967f97fa | aliguori | |
564 | 06dbfc6f | Alexander Graf | val = lduw_p(vdev->config + addr); |
565 | 967f97fa | aliguori | return val;
|
566 | 967f97fa | aliguori | } |
567 | 967f97fa | aliguori | |
568 | 53c25cea | Paul Brook | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
569 | 967f97fa | aliguori | { |
570 | 967f97fa | aliguori | uint32_t val; |
571 | 967f97fa | aliguori | |
572 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
573 | 967f97fa | aliguori | |
574 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
575 | 967f97fa | aliguori | return (uint32_t)-1; |
576 | 967f97fa | aliguori | |
577 | 06dbfc6f | Alexander Graf | val = ldl_p(vdev->config + addr); |
578 | 967f97fa | aliguori | return val;
|
579 | 967f97fa | aliguori | } |
580 | 967f97fa | aliguori | |
581 | 53c25cea | Paul Brook | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
582 | 967f97fa | aliguori | { |
583 | 967f97fa | aliguori | uint8_t val = data; |
584 | 967f97fa | aliguori | |
585 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
586 | 967f97fa | aliguori | return;
|
587 | 967f97fa | aliguori | |
588 | 06dbfc6f | Alexander Graf | stb_p(vdev->config + addr, val); |
589 | 967f97fa | aliguori | |
590 | 967f97fa | aliguori | if (vdev->set_config)
|
591 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
592 | 967f97fa | aliguori | } |
593 | 967f97fa | aliguori | |
594 | 53c25cea | Paul Brook | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
595 | 967f97fa | aliguori | { |
596 | 967f97fa | aliguori | uint16_t val = data; |
597 | 967f97fa | aliguori | |
598 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
599 | 967f97fa | aliguori | return;
|
600 | 967f97fa | aliguori | |
601 | 06dbfc6f | Alexander Graf | stw_p(vdev->config + addr, val); |
602 | 967f97fa | aliguori | |
603 | 967f97fa | aliguori | if (vdev->set_config)
|
604 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
605 | 967f97fa | aliguori | } |
606 | 967f97fa | aliguori | |
607 | 53c25cea | Paul Brook | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
608 | 967f97fa | aliguori | { |
609 | 967f97fa | aliguori | uint32_t val = data; |
610 | 967f97fa | aliguori | |
611 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
612 | 967f97fa | aliguori | return;
|
613 | 967f97fa | aliguori | |
614 | 06dbfc6f | Alexander Graf | stl_p(vdev->config + addr, val); |
615 | 967f97fa | aliguori | |
616 | 967f97fa | aliguori | if (vdev->set_config)
|
617 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
618 | 967f97fa | aliguori | } |
619 | 967f97fa | aliguori | |
620 | c227f099 | Anthony Liguori | void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr) |
621 | 967f97fa | aliguori | { |
622 | 7055e687 | Michael S. Tsirkin | vdev->vq[n].pa = addr; |
623 | 7055e687 | Michael S. Tsirkin | virtqueue_init(&vdev->vq[n]); |
624 | 53c25cea | Paul Brook | } |
625 | 53c25cea | Paul Brook | |
626 | c227f099 | Anthony Liguori | target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
627 | 53c25cea | Paul Brook | { |
628 | 53c25cea | Paul Brook | return vdev->vq[n].pa;
|
629 | 53c25cea | Paul Brook | } |
630 | 53c25cea | Paul Brook | |
631 | 53c25cea | Paul Brook | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
632 | 53c25cea | Paul Brook | { |
633 | 53c25cea | Paul Brook | return vdev->vq[n].vring.num;
|
634 | 53c25cea | Paul Brook | } |
635 | 967f97fa | aliguori | |
636 | c80decdb | Paolo Bonzini | int virtio_queue_get_id(VirtQueue *vq)
|
637 | c80decdb | Paolo Bonzini | { |
638 | c80decdb | Paolo Bonzini | VirtIODevice *vdev = vq->vdev; |
639 | c80decdb | Paolo Bonzini | assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_PCI_QUEUE_MAX]);
|
640 | c80decdb | Paolo Bonzini | return vq - &vdev->vq[0]; |
641 | c80decdb | Paolo Bonzini | } |
642 | c80decdb | Paolo Bonzini | |
643 | 25db9ebe | Stefan Hajnoczi | void virtio_queue_notify_vq(VirtQueue *vq)
|
644 | 25db9ebe | Stefan Hajnoczi | { |
645 | 25db9ebe | Stefan Hajnoczi | if (vq->vring.desc) {
|
646 | 25db9ebe | Stefan Hajnoczi | VirtIODevice *vdev = vq->vdev; |
647 | 25db9ebe | Stefan Hajnoczi | trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
648 | 25db9ebe | Stefan Hajnoczi | vq->handle_output(vdev, vq); |
649 | 25db9ebe | Stefan Hajnoczi | } |
650 | 25db9ebe | Stefan Hajnoczi | } |
651 | 25db9ebe | Stefan Hajnoczi | |
652 | 53c25cea | Paul Brook | void virtio_queue_notify(VirtIODevice *vdev, int n) |
653 | 53c25cea | Paul Brook | { |
654 | 7157e2e2 | Stefan Hajnoczi | virtio_queue_notify_vq(&vdev->vq[n]); |
655 | 967f97fa | aliguori | } |
656 | 967f97fa | aliguori | |
657 | 7055e687 | Michael S. Tsirkin | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
658 | 7055e687 | Michael S. Tsirkin | { |
659 | 7055e687 | Michael S. Tsirkin | return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector :
|
660 | 7055e687 | Michael S. Tsirkin | VIRTIO_NO_VECTOR; |
661 | 7055e687 | Michael S. Tsirkin | } |
662 | 7055e687 | Michael S. Tsirkin | |
663 | 7055e687 | Michael S. Tsirkin | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) |
664 | 7055e687 | Michael S. Tsirkin | { |
665 | 7055e687 | Michael S. Tsirkin | if (n < VIRTIO_PCI_QUEUE_MAX)
|
666 | 7055e687 | Michael S. Tsirkin | vdev->vq[n].vector = vector; |
667 | 7055e687 | Michael S. Tsirkin | } |
668 | 7055e687 | Michael S. Tsirkin | |
669 | 967f97fa | aliguori | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
670 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *, VirtQueue *))
|
671 | 967f97fa | aliguori | { |
672 | 967f97fa | aliguori | int i;
|
673 | 967f97fa | aliguori | |
674 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
675 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
676 | 967f97fa | aliguori | break;
|
677 | 967f97fa | aliguori | } |
678 | 967f97fa | aliguori | |
679 | 967f97fa | aliguori | if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
680 | 967f97fa | aliguori | abort(); |
681 | 967f97fa | aliguori | |
682 | 967f97fa | aliguori | vdev->vq[i].vring.num = queue_size; |
683 | 967f97fa | aliguori | vdev->vq[i].handle_output = handle_output; |
684 | 967f97fa | aliguori | |
685 | 967f97fa | aliguori | return &vdev->vq[i];
|
686 | 967f97fa | aliguori | } |
687 | 967f97fa | aliguori | |
688 | 1cbdabe2 | Michael S. Tsirkin | void virtio_irq(VirtQueue *vq)
|
689 | 1cbdabe2 | Michael S. Tsirkin | { |
690 | 64979a4d | Stefan Hajnoczi | trace_virtio_irq(vq); |
691 | 1cbdabe2 | Michael S. Tsirkin | vq->vdev->isr |= 0x01;
|
692 | 1cbdabe2 | Michael S. Tsirkin | virtio_notify_vector(vq->vdev, vq->vector); |
693 | 1cbdabe2 | Michael S. Tsirkin | } |
694 | 1cbdabe2 | Michael S. Tsirkin | |
695 | bcbabae8 | Michael S. Tsirkin | /* Assuming a given event_idx value from the other size, if
|
696 | bcbabae8 | Michael S. Tsirkin | * we have just incremented index from old to new_idx,
|
697 | bcbabae8 | Michael S. Tsirkin | * should we trigger an event? */
|
698 | bcbabae8 | Michael S. Tsirkin | static inline int vring_need_event(uint16_t event, uint16_t new, uint16_t old) |
699 | 967f97fa | aliguori | { |
700 | bcbabae8 | Michael S. Tsirkin | /* Note: Xen has similar logic for notification hold-off
|
701 | bcbabae8 | Michael S. Tsirkin | * in include/xen/interface/io/ring.h with req_event and req_prod
|
702 | bcbabae8 | Michael S. Tsirkin | * corresponding to event_idx + 1 and new respectively.
|
703 | bcbabae8 | Michael S. Tsirkin | * Note also that req_event and req_prod in Xen start at 1,
|
704 | bcbabae8 | Michael S. Tsirkin | * event indexes in virtio start at 0. */
|
705 | bcbabae8 | Michael S. Tsirkin | return (uint16_t)(new - event - 1) < (uint16_t)(new - old); |
706 | bcbabae8 | Michael S. Tsirkin | } |
707 | bcbabae8 | Michael S. Tsirkin | |
708 | bcbabae8 | Michael S. Tsirkin | static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq) |
709 | bcbabae8 | Michael S. Tsirkin | { |
710 | bcbabae8 | Michael S. Tsirkin | uint16_t old, new; |
711 | bcbabae8 | Michael S. Tsirkin | bool v;
|
712 | a281ebc1 | Michael S. Tsirkin | /* We need to expose used array entries before checking used event. */
|
713 | a281ebc1 | Michael S. Tsirkin | smp_mb(); |
714 | 97b83deb | aliguori | /* Always notify when queue is empty (when feature acknowledge) */
|
715 | bcbabae8 | Michael S. Tsirkin | if (((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) && |
716 | bcbabae8 | Michael S. Tsirkin | !vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx)) { |
717 | bcbabae8 | Michael S. Tsirkin | return true; |
718 | bcbabae8 | Michael S. Tsirkin | } |
719 | bcbabae8 | Michael S. Tsirkin | |
720 | bcbabae8 | Michael S. Tsirkin | if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) { |
721 | bcbabae8 | Michael S. Tsirkin | return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
|
722 | bcbabae8 | Michael S. Tsirkin | } |
723 | bcbabae8 | Michael S. Tsirkin | |
724 | bcbabae8 | Michael S. Tsirkin | v = vq->signalled_used_valid; |
725 | bcbabae8 | Michael S. Tsirkin | vq->signalled_used_valid = true;
|
726 | bcbabae8 | Michael S. Tsirkin | old = vq->signalled_used; |
727 | bcbabae8 | Michael S. Tsirkin | new = vq->signalled_used = vring_used_idx(vq); |
728 | bcbabae8 | Michael S. Tsirkin | return !v || vring_need_event(vring_used_event(vq), new, old);
|
729 | bcbabae8 | Michael S. Tsirkin | } |
730 | bcbabae8 | Michael S. Tsirkin | |
731 | bcbabae8 | Michael S. Tsirkin | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
732 | bcbabae8 | Michael S. Tsirkin | { |
733 | bcbabae8 | Michael S. Tsirkin | if (!vring_notify(vdev, vq)) {
|
734 | 967f97fa | aliguori | return;
|
735 | bcbabae8 | Michael S. Tsirkin | } |
736 | 967f97fa | aliguori | |
737 | 64979a4d | Stefan Hajnoczi | trace_virtio_notify(vdev, vq); |
738 | 967f97fa | aliguori | vdev->isr |= 0x01;
|
739 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vq->vector); |
740 | 967f97fa | aliguori | } |
741 | 967f97fa | aliguori | |
742 | 967f97fa | aliguori | void virtio_notify_config(VirtIODevice *vdev)
|
743 | 967f97fa | aliguori | { |
744 | 7625162c | aliguori | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
745 | 7625162c | aliguori | return;
|
746 | 7625162c | aliguori | |
747 | 967f97fa | aliguori | vdev->isr |= 0x03;
|
748 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vdev->config_vector); |
749 | 967f97fa | aliguori | } |
750 | 967f97fa | aliguori | |
751 | 967f97fa | aliguori | void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
752 | 967f97fa | aliguori | { |
753 | 967f97fa | aliguori | int i;
|
754 | 967f97fa | aliguori | |
755 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->save_config)
|
756 | ff24bd58 | Michael S. Tsirkin | vdev->binding->save_config(vdev->binding_opaque, f); |
757 | 967f97fa | aliguori | |
758 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->status); |
759 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->isr); |
760 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->queue_sel); |
761 | 704a76fc | Michael S. Tsirkin | qemu_put_be32s(f, &vdev->guest_features); |
762 | 967f97fa | aliguori | qemu_put_be32(f, vdev->config_len); |
763 | 967f97fa | aliguori | qemu_put_buffer(f, vdev->config, vdev->config_len); |
764 | 967f97fa | aliguori | |
765 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
766 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
767 | 967f97fa | aliguori | break;
|
768 | 967f97fa | aliguori | } |
769 | 967f97fa | aliguori | |
770 | 967f97fa | aliguori | qemu_put_be32(f, i); |
771 | 967f97fa | aliguori | |
772 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
773 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
774 | 967f97fa | aliguori | break;
|
775 | 967f97fa | aliguori | |
776 | 967f97fa | aliguori | qemu_put_be32(f, vdev->vq[i].vring.num); |
777 | 53c25cea | Paul Brook | qemu_put_be64(f, vdev->vq[i].pa); |
778 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
779 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->save_queue)
|
780 | ff24bd58 | Michael S. Tsirkin | vdev->binding->save_queue(vdev->binding_opaque, i, f); |
781 | 967f97fa | aliguori | } |
782 | 967f97fa | aliguori | } |
783 | 967f97fa | aliguori | |
784 | ad0c9332 | Paolo Bonzini | int virtio_set_features(VirtIODevice *vdev, uint32_t val)
|
785 | ad0c9332 | Paolo Bonzini | { |
786 | ad0c9332 | Paolo Bonzini | uint32_t supported_features = |
787 | ad0c9332 | Paolo Bonzini | vdev->binding->get_features(vdev->binding_opaque); |
788 | ad0c9332 | Paolo Bonzini | bool bad = (val & ~supported_features) != 0; |
789 | ad0c9332 | Paolo Bonzini | |
790 | ad0c9332 | Paolo Bonzini | val &= supported_features; |
791 | ad0c9332 | Paolo Bonzini | if (vdev->set_features) {
|
792 | ad0c9332 | Paolo Bonzini | vdev->set_features(vdev, val); |
793 | ad0c9332 | Paolo Bonzini | } |
794 | ad0c9332 | Paolo Bonzini | vdev->guest_features = val; |
795 | ad0c9332 | Paolo Bonzini | return bad ? -1 : 0; |
796 | ad0c9332 | Paolo Bonzini | } |
797 | ad0c9332 | Paolo Bonzini | |
798 | ff24bd58 | Michael S. Tsirkin | int virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
799 | 967f97fa | aliguori | { |
800 | ff24bd58 | Michael S. Tsirkin | int num, i, ret;
|
801 | 6d74ca5a | Michael S. Tsirkin | uint32_t features; |
802 | ad0c9332 | Paolo Bonzini | uint32_t supported_features; |
803 | 967f97fa | aliguori | |
804 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->load_config) {
|
805 | ff24bd58 | Michael S. Tsirkin | ret = vdev->binding->load_config(vdev->binding_opaque, f); |
806 | ff24bd58 | Michael S. Tsirkin | if (ret)
|
807 | ff24bd58 | Michael S. Tsirkin | return ret;
|
808 | ff24bd58 | Michael S. Tsirkin | } |
809 | 967f97fa | aliguori | |
810 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->status); |
811 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->isr); |
812 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->queue_sel); |
813 | 6d74ca5a | Michael S. Tsirkin | qemu_get_be32s(f, &features); |
814 | ad0c9332 | Paolo Bonzini | |
815 | ad0c9332 | Paolo Bonzini | if (virtio_set_features(vdev, features) < 0) { |
816 | ad0c9332 | Paolo Bonzini | supported_features = vdev->binding->get_features(vdev->binding_opaque); |
817 | ce67ed65 | Stefan Hajnoczi | error_report("Features 0x%x unsupported. Allowed features: 0x%x",
|
818 | ce67ed65 | Stefan Hajnoczi | features, supported_features); |
819 | 6d74ca5a | Michael S. Tsirkin | return -1; |
820 | 6d74ca5a | Michael S. Tsirkin | } |
821 | 967f97fa | aliguori | vdev->config_len = qemu_get_be32(f); |
822 | 967f97fa | aliguori | qemu_get_buffer(f, vdev->config, vdev->config_len); |
823 | 967f97fa | aliguori | |
824 | 967f97fa | aliguori | num = qemu_get_be32(f); |
825 | 967f97fa | aliguori | |
826 | 967f97fa | aliguori | for (i = 0; i < num; i++) { |
827 | 967f97fa | aliguori | vdev->vq[i].vring.num = qemu_get_be32(f); |
828 | 53c25cea | Paul Brook | vdev->vq[i].pa = qemu_get_be64(f); |
829 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
830 | bcbabae8 | Michael S. Tsirkin | vdev->vq[i].signalled_used_valid = false;
|
831 | bcbabae8 | Michael S. Tsirkin | vdev->vq[i].notification = true;
|
832 | 967f97fa | aliguori | |
833 | 53c25cea | Paul Brook | if (vdev->vq[i].pa) {
|
834 | 1abeb5a6 | Michael S. Tsirkin | uint16_t nheads; |
835 | 53c25cea | Paul Brook | virtqueue_init(&vdev->vq[i]); |
836 | 1abeb5a6 | Michael S. Tsirkin | nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; |
837 | 1abeb5a6 | Michael S. Tsirkin | /* Check it isn't doing very strange things with descriptor numbers. */
|
838 | 1abeb5a6 | Michael S. Tsirkin | if (nheads > vdev->vq[i].vring.num) {
|
839 | 1abeb5a6 | Michael S. Tsirkin | error_report("VQ %d size 0x%x Guest index 0x%x "
|
840 | 6daf194d | Markus Armbruster | "inconsistent with Host index 0x%x: delta 0x%x",
|
841 | 1abeb5a6 | Michael S. Tsirkin | i, vdev->vq[i].vring.num, |
842 | 1abeb5a6 | Michael S. Tsirkin | vring_avail_idx(&vdev->vq[i]), |
843 | 1abeb5a6 | Michael S. Tsirkin | vdev->vq[i].last_avail_idx, nheads); |
844 | 1abeb5a6 | Michael S. Tsirkin | return -1; |
845 | 1abeb5a6 | Michael S. Tsirkin | } |
846 | 1abeb5a6 | Michael S. Tsirkin | } else if (vdev->vq[i].last_avail_idx) { |
847 | 1abeb5a6 | Michael S. Tsirkin | error_report("VQ %d address 0x0 "
|
848 | 6daf194d | Markus Armbruster | "inconsistent with Host index 0x%x",
|
849 | 1abeb5a6 | Michael S. Tsirkin | i, vdev->vq[i].last_avail_idx); |
850 | 1abeb5a6 | Michael S. Tsirkin | return -1; |
851 | 258dc7c9 | Michael S. Tsirkin | } |
852 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->load_queue) {
|
853 | ff24bd58 | Michael S. Tsirkin | ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); |
854 | ff24bd58 | Michael S. Tsirkin | if (ret)
|
855 | ff24bd58 | Michael S. Tsirkin | return ret;
|
856 | 7055e687 | Michael S. Tsirkin | } |
857 | 967f97fa | aliguori | } |
858 | 967f97fa | aliguori | |
859 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
860 | ff24bd58 | Michael S. Tsirkin | return 0; |
861 | 967f97fa | aliguori | } |
862 | 967f97fa | aliguori | |
863 | b946a153 | aliguori | void virtio_cleanup(VirtIODevice *vdev)
|
864 | b946a153 | aliguori | { |
865 | 85cf2a8d | Michael S. Tsirkin | qemu_del_vm_change_state_handler(vdev->vmstate); |
866 | 6f79e06b | Luiz Capitulino | g_free(vdev->config); |
867 | 7267c094 | Anthony Liguori | g_free(vdev->vq); |
868 | 7267c094 | Anthony Liguori | g_free(vdev); |
869 | b946a153 | aliguori | } |
870 | b946a153 | aliguori | |
871 | 1dfb4dd9 | Luiz Capitulino | static void virtio_vmstate_change(void *opaque, int running, RunState state) |
872 | 85cf2a8d | Michael S. Tsirkin | { |
873 | 85cf2a8d | Michael S. Tsirkin | VirtIODevice *vdev = opaque; |
874 | 85cf2a8d | Michael S. Tsirkin | bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK);
|
875 | 85cf2a8d | Michael S. Tsirkin | vdev->vm_running = running; |
876 | 85cf2a8d | Michael S. Tsirkin | |
877 | 85cf2a8d | Michael S. Tsirkin | if (backend_run) {
|
878 | 85cf2a8d | Michael S. Tsirkin | virtio_set_status(vdev, vdev->status); |
879 | 85cf2a8d | Michael S. Tsirkin | } |
880 | 85cf2a8d | Michael S. Tsirkin | |
881 | 85cf2a8d | Michael S. Tsirkin | if (vdev->binding->vmstate_change) {
|
882 | 85cf2a8d | Michael S. Tsirkin | vdev->binding->vmstate_change(vdev->binding_opaque, backend_run); |
883 | 85cf2a8d | Michael S. Tsirkin | } |
884 | 85cf2a8d | Michael S. Tsirkin | |
885 | 85cf2a8d | Michael S. Tsirkin | if (!backend_run) {
|
886 | 85cf2a8d | Michael S. Tsirkin | virtio_set_status(vdev, vdev->status); |
887 | 85cf2a8d | Michael S. Tsirkin | } |
888 | 85cf2a8d | Michael S. Tsirkin | } |
889 | 85cf2a8d | Michael S. Tsirkin | |
890 | 53c25cea | Paul Brook | VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, |
891 | 53c25cea | Paul Brook | size_t config_size, size_t struct_size) |
892 | 967f97fa | aliguori | { |
893 | 967f97fa | aliguori | VirtIODevice *vdev; |
894 | b8193adb | Michael S. Tsirkin | int i;
|
895 | 967f97fa | aliguori | |
896 | 7267c094 | Anthony Liguori | vdev = g_malloc0(struct_size); |
897 | 967f97fa | aliguori | |
898 | 53c25cea | Paul Brook | vdev->device_id = device_id; |
899 | 967f97fa | aliguori | vdev->status = 0;
|
900 | 967f97fa | aliguori | vdev->isr = 0;
|
901 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
902 | 7055e687 | Michael S. Tsirkin | vdev->config_vector = VIRTIO_NO_VECTOR; |
903 | 7267c094 | Anthony Liguori | vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
904 | 1354869c | Luiz Capitulino | vdev->vm_running = runstate_is_running(); |
905 | 1cbdabe2 | Michael S. Tsirkin | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
906 | b8193adb | Michael S. Tsirkin | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
907 | 1cbdabe2 | Michael S. Tsirkin | vdev->vq[i].vdev = vdev; |
908 | 1cbdabe2 | Michael S. Tsirkin | } |
909 | 967f97fa | aliguori | |
910 | 967f97fa | aliguori | vdev->name = name; |
911 | 967f97fa | aliguori | vdev->config_len = config_size; |
912 | 967f97fa | aliguori | if (vdev->config_len)
|
913 | 7267c094 | Anthony Liguori | vdev->config = g_malloc0(config_size); |
914 | 967f97fa | aliguori | else
|
915 | 967f97fa | aliguori | vdev->config = NULL;
|
916 | 967f97fa | aliguori | |
917 | 85cf2a8d | Michael S. Tsirkin | vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, vdev); |
918 | 85cf2a8d | Michael S. Tsirkin | |
919 | 967f97fa | aliguori | return vdev;
|
920 | 967f97fa | aliguori | } |
921 | 53c25cea | Paul Brook | |
922 | 53c25cea | Paul Brook | void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, |
923 | 53c25cea | Paul Brook | void *opaque)
|
924 | 53c25cea | Paul Brook | { |
925 | 53c25cea | Paul Brook | vdev->binding = binding; |
926 | 53c25cea | Paul Brook | vdev->binding_opaque = opaque; |
927 | 53c25cea | Paul Brook | } |
928 | 1cbdabe2 | Michael S. Tsirkin | |
929 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
|
930 | 1cbdabe2 | Michael S. Tsirkin | { |
931 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.desc;
|
932 | 1cbdabe2 | Michael S. Tsirkin | } |
933 | 1cbdabe2 | Michael S. Tsirkin | |
934 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
|
935 | 1cbdabe2 | Michael S. Tsirkin | { |
936 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.avail;
|
937 | 1cbdabe2 | Michael S. Tsirkin | } |
938 | 1cbdabe2 | Michael S. Tsirkin | |
939 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
|
940 | 1cbdabe2 | Michael S. Tsirkin | { |
941 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.used;
|
942 | 1cbdabe2 | Michael S. Tsirkin | } |
943 | 1cbdabe2 | Michael S. Tsirkin | |
944 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n)
|
945 | 1cbdabe2 | Michael S. Tsirkin | { |
946 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.desc;
|
947 | 1cbdabe2 | Michael S. Tsirkin | } |
948 | 1cbdabe2 | Michael S. Tsirkin | |
949 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
|
950 | 1cbdabe2 | Michael S. Tsirkin | { |
951 | 1cbdabe2 | Michael S. Tsirkin | return sizeof(VRingDesc) * vdev->vq[n].vring.num; |
952 | 1cbdabe2 | Michael S. Tsirkin | } |
953 | 1cbdabe2 | Michael S. Tsirkin | |
954 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
|
955 | 1cbdabe2 | Michael S. Tsirkin | { |
956 | 1cbdabe2 | Michael S. Tsirkin | return offsetof(VRingAvail, ring) +
|
957 | 2b3af999 | Stefan Weil | sizeof(uint64_t) * vdev->vq[n].vring.num;
|
958 | 1cbdabe2 | Michael S. Tsirkin | } |
959 | 1cbdabe2 | Michael S. Tsirkin | |
960 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n)
|
961 | 1cbdabe2 | Michael S. Tsirkin | { |
962 | 1cbdabe2 | Michael S. Tsirkin | return offsetof(VRingUsed, ring) +
|
963 | 1cbdabe2 | Michael S. Tsirkin | sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
|
964 | 1cbdabe2 | Michael S. Tsirkin | } |
965 | 1cbdabe2 | Michael S. Tsirkin | |
966 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
|
967 | 1cbdabe2 | Michael S. Tsirkin | { |
968 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
|
969 | 1cbdabe2 | Michael S. Tsirkin | virtio_queue_get_used_size(vdev, n); |
970 | 1cbdabe2 | Michael S. Tsirkin | } |
971 | 1cbdabe2 | Michael S. Tsirkin | |
972 | 1cbdabe2 | Michael S. Tsirkin | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
973 | 1cbdabe2 | Michael S. Tsirkin | { |
974 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].last_avail_idx;
|
975 | 1cbdabe2 | Michael S. Tsirkin | } |
976 | 1cbdabe2 | Michael S. Tsirkin | |
977 | 1cbdabe2 | Michael S. Tsirkin | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) |
978 | 1cbdabe2 | Michael S. Tsirkin | { |
979 | 1cbdabe2 | Michael S. Tsirkin | vdev->vq[n].last_avail_idx = idx; |
980 | 1cbdabe2 | Michael S. Tsirkin | } |
981 | 1cbdabe2 | Michael S. Tsirkin | |
982 | 1cbdabe2 | Michael S. Tsirkin | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
983 | 1cbdabe2 | Michael S. Tsirkin | { |
984 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq + n;
|
985 | 1cbdabe2 | Michael S. Tsirkin | } |
986 | 1cbdabe2 | Michael S. Tsirkin | |
987 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
988 | 1cbdabe2 | Michael S. Tsirkin | { |
989 | 1cbdabe2 | Michael S. Tsirkin | return &vq->guest_notifier;
|
990 | 1cbdabe2 | Michael S. Tsirkin | } |
991 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
992 | 1cbdabe2 | Michael S. Tsirkin | { |
993 | 1cbdabe2 | Michael S. Tsirkin | return &vq->host_notifier;
|
994 | 1cbdabe2 | Michael S. Tsirkin | } |