root / hw / virtio.c @ 3f7132d1
History | View | Annotate | Download (21.3 kB)
1 | 967f97fa | aliguori | /*
|
---|---|---|---|
2 | 967f97fa | aliguori | * Virtio Support
|
3 | 967f97fa | aliguori | *
|
4 | 967f97fa | aliguori | * Copyright IBM, Corp. 2007
|
5 | 967f97fa | aliguori | *
|
6 | 967f97fa | aliguori | * Authors:
|
7 | 967f97fa | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
|
8 | 967f97fa | aliguori | *
|
9 | 967f97fa | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
|
10 | 967f97fa | aliguori | * the COPYING file in the top-level directory.
|
11 | 967f97fa | aliguori | *
|
12 | 967f97fa | aliguori | */
|
13 | 967f97fa | aliguori | |
14 | 967f97fa | aliguori | #include <inttypes.h> |
15 | 967f97fa | aliguori | |
16 | 64979a4d | Stefan Hajnoczi | #include "trace.h" |
17 | 967f97fa | aliguori | #include "virtio.h" |
18 | 967f97fa | aliguori | #include "sysemu.h" |
19 | 967f97fa | aliguori | |
20 | f46f15bc | aliguori | /* The alignment to use between consumer and producer parts of vring.
|
21 | f46f15bc | aliguori | * x86 pagesize again. */
|
22 | f46f15bc | aliguori | #define VIRTIO_PCI_VRING_ALIGN 4096 |
23 | f46f15bc | aliguori | |
24 | 967f97fa | aliguori | /* QEMU doesn't strictly need write barriers since everything runs in
|
25 | 967f97fa | aliguori | * lock-step. We'll leave the calls to wmb() in though to make it obvious for
|
26 | 967f97fa | aliguori | * KVM or if kqemu gets SMP support.
|
27 | 79758e95 | Michael S. Tsirkin | * In any case, we must prevent the compiler from reordering the code.
|
28 | 79758e95 | Michael S. Tsirkin | * TODO: we likely need some rmb()/mb() as well.
|
29 | 967f97fa | aliguori | */
|
30 | 79758e95 | Michael S. Tsirkin | |
31 | 79758e95 | Michael S. Tsirkin | #define wmb() __asm__ __volatile__("": : :"memory") |
32 | 967f97fa | aliguori | |
33 | 967f97fa | aliguori | typedef struct VRingDesc |
34 | 967f97fa | aliguori | { |
35 | 967f97fa | aliguori | uint64_t addr; |
36 | 967f97fa | aliguori | uint32_t len; |
37 | 967f97fa | aliguori | uint16_t flags; |
38 | 967f97fa | aliguori | uint16_t next; |
39 | 967f97fa | aliguori | } VRingDesc; |
40 | 967f97fa | aliguori | |
41 | 967f97fa | aliguori | typedef struct VRingAvail |
42 | 967f97fa | aliguori | { |
43 | 967f97fa | aliguori | uint16_t flags; |
44 | 967f97fa | aliguori | uint16_t idx; |
45 | 967f97fa | aliguori | uint16_t ring[0];
|
46 | 967f97fa | aliguori | } VRingAvail; |
47 | 967f97fa | aliguori | |
48 | 967f97fa | aliguori | typedef struct VRingUsedElem |
49 | 967f97fa | aliguori | { |
50 | 967f97fa | aliguori | uint32_t id; |
51 | 967f97fa | aliguori | uint32_t len; |
52 | 967f97fa | aliguori | } VRingUsedElem; |
53 | 967f97fa | aliguori | |
54 | 967f97fa | aliguori | typedef struct VRingUsed |
55 | 967f97fa | aliguori | { |
56 | 967f97fa | aliguori | uint16_t flags; |
57 | 967f97fa | aliguori | uint16_t idx; |
58 | 967f97fa | aliguori | VRingUsedElem ring[0];
|
59 | 967f97fa | aliguori | } VRingUsed; |
60 | 967f97fa | aliguori | |
61 | 967f97fa | aliguori | typedef struct VRing |
62 | 967f97fa | aliguori | { |
63 | 967f97fa | aliguori | unsigned int num; |
64 | c227f099 | Anthony Liguori | target_phys_addr_t desc; |
65 | c227f099 | Anthony Liguori | target_phys_addr_t avail; |
66 | c227f099 | Anthony Liguori | target_phys_addr_t used; |
67 | 967f97fa | aliguori | } VRing; |
68 | 967f97fa | aliguori | |
69 | 967f97fa | aliguori | struct VirtQueue
|
70 | 967f97fa | aliguori | { |
71 | 967f97fa | aliguori | VRing vring; |
72 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
73 | 967f97fa | aliguori | uint16_t last_avail_idx; |
74 | 967f97fa | aliguori | int inuse;
|
75 | 7055e687 | Michael S. Tsirkin | uint16_t vector; |
76 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
|
77 | 1cbdabe2 | Michael S. Tsirkin | VirtIODevice *vdev; |
78 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier guest_notifier; |
79 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier host_notifier; |
80 | 967f97fa | aliguori | }; |
81 | 967f97fa | aliguori | |
82 | 967f97fa | aliguori | /* virt queue functions */
|
83 | 53c25cea | Paul Brook | static void virtqueue_init(VirtQueue *vq) |
84 | 967f97fa | aliguori | { |
85 | c227f099 | Anthony Liguori | target_phys_addr_t pa = vq->pa; |
86 | 53c25cea | Paul Brook | |
87 | 967f97fa | aliguori | vq->vring.desc = pa; |
88 | 967f97fa | aliguori | vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
|
89 | f46f15bc | aliguori | vq->vring.used = vring_align(vq->vring.avail + |
90 | f46f15bc | aliguori | offsetof(VRingAvail, ring[vq->vring.num]), |
91 | f46f15bc | aliguori | VIRTIO_PCI_VRING_ALIGN); |
92 | 967f97fa | aliguori | } |
93 | 967f97fa | aliguori | |
94 | c227f099 | Anthony Liguori | static inline uint64_t vring_desc_addr(target_phys_addr_t desc_pa, int i) |
95 | 967f97fa | aliguori | { |
96 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
97 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
|
98 | 967f97fa | aliguori | return ldq_phys(pa);
|
99 | 967f97fa | aliguori | } |
100 | 967f97fa | aliguori | |
101 | c227f099 | Anthony Liguori | static inline uint32_t vring_desc_len(target_phys_addr_t desc_pa, int i) |
102 | 967f97fa | aliguori | { |
103 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
104 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
|
105 | 967f97fa | aliguori | return ldl_phys(pa);
|
106 | 967f97fa | aliguori | } |
107 | 967f97fa | aliguori | |
108 | c227f099 | Anthony Liguori | static inline uint16_t vring_desc_flags(target_phys_addr_t desc_pa, int i) |
109 | 967f97fa | aliguori | { |
110 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
111 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
|
112 | 967f97fa | aliguori | return lduw_phys(pa);
|
113 | 967f97fa | aliguori | } |
114 | 967f97fa | aliguori | |
115 | c227f099 | Anthony Liguori | static inline uint16_t vring_desc_next(target_phys_addr_t desc_pa, int i) |
116 | 967f97fa | aliguori | { |
117 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
118 | 5774cf98 | Mark McLoughlin | pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
|
119 | 967f97fa | aliguori | return lduw_phys(pa);
|
120 | 967f97fa | aliguori | } |
121 | 967f97fa | aliguori | |
122 | 967f97fa | aliguori | static inline uint16_t vring_avail_flags(VirtQueue *vq) |
123 | 967f97fa | aliguori | { |
124 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
125 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, flags); |
126 | 967f97fa | aliguori | return lduw_phys(pa);
|
127 | 967f97fa | aliguori | } |
128 | 967f97fa | aliguori | |
129 | 967f97fa | aliguori | static inline uint16_t vring_avail_idx(VirtQueue *vq) |
130 | 967f97fa | aliguori | { |
131 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
132 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, idx); |
133 | 967f97fa | aliguori | return lduw_phys(pa);
|
134 | 967f97fa | aliguori | } |
135 | 967f97fa | aliguori | |
136 | 967f97fa | aliguori | static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
137 | 967f97fa | aliguori | { |
138 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
139 | 967f97fa | aliguori | pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
140 | 967f97fa | aliguori | return lduw_phys(pa);
|
141 | 967f97fa | aliguori | } |
142 | 967f97fa | aliguori | |
143 | 967f97fa | aliguori | static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
144 | 967f97fa | aliguori | { |
145 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
146 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
147 | 967f97fa | aliguori | stl_phys(pa, val); |
148 | 967f97fa | aliguori | } |
149 | 967f97fa | aliguori | |
150 | 967f97fa | aliguori | static inline void vring_used_ring_len(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].len); |
154 | 967f97fa | aliguori | stl_phys(pa, val); |
155 | 967f97fa | aliguori | } |
156 | 967f97fa | aliguori | |
157 | 967f97fa | aliguori | static uint16_t vring_used_idx(VirtQueue *vq)
|
158 | 967f97fa | aliguori | { |
159 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
160 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, idx); |
161 | 967f97fa | aliguori | return lduw_phys(pa);
|
162 | 967f97fa | aliguori | } |
163 | 967f97fa | aliguori | |
164 | 967f97fa | aliguori | static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val) |
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 | stw_phys(pa, vring_used_idx(vq) + val); |
169 | 967f97fa | aliguori | } |
170 | 967f97fa | aliguori | |
171 | 967f97fa | aliguori | static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
172 | 967f97fa | aliguori | { |
173 | c227f099 | Anthony Liguori | target_phys_addr_t pa; |
174 | 967f97fa | aliguori | pa = vq->vring.used + offsetof(VRingUsed, flags); |
175 | 967f97fa | aliguori | stw_phys(pa, lduw_phys(pa) | mask); |
176 | 967f97fa | aliguori | } |
177 | 967f97fa | aliguori | |
178 | 967f97fa | aliguori | static inline void vring_used_flags_unset_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 | void virtio_queue_set_notification(VirtQueue *vq, int enable) |
186 | 967f97fa | aliguori | { |
187 | 967f97fa | aliguori | if (enable)
|
188 | 967f97fa | aliguori | vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
189 | 967f97fa | aliguori | else
|
190 | 967f97fa | aliguori | vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
191 | 967f97fa | aliguori | } |
192 | 967f97fa | aliguori | |
193 | 967f97fa | aliguori | int virtio_queue_ready(VirtQueue *vq)
|
194 | 967f97fa | aliguori | { |
195 | 967f97fa | aliguori | return vq->vring.avail != 0; |
196 | 967f97fa | aliguori | } |
197 | 967f97fa | aliguori | |
198 | 967f97fa | aliguori | int virtio_queue_empty(VirtQueue *vq)
|
199 | 967f97fa | aliguori | { |
200 | 967f97fa | aliguori | return vring_avail_idx(vq) == vq->last_avail_idx;
|
201 | 967f97fa | aliguori | } |
202 | 967f97fa | aliguori | |
203 | 967f97fa | aliguori | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
204 | 967f97fa | aliguori | unsigned int len, unsigned int idx) |
205 | 967f97fa | aliguori | { |
206 | 967f97fa | aliguori | unsigned int offset; |
207 | 967f97fa | aliguori | int i;
|
208 | 967f97fa | aliguori | |
209 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_fill(vq, elem, len, idx); |
210 | 64979a4d | Stefan Hajnoczi | |
211 | 967f97fa | aliguori | offset = 0;
|
212 | 967f97fa | aliguori | for (i = 0; i < elem->in_num; i++) { |
213 | 967f97fa | aliguori | size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
214 | 967f97fa | aliguori | |
215 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
216 | 26b258e1 | aliguori | elem->in_sg[i].iov_len, |
217 | 26b258e1 | aliguori | 1, size);
|
218 | 967f97fa | aliguori | |
219 | 26b258e1 | aliguori | offset += elem->in_sg[i].iov_len; |
220 | 967f97fa | aliguori | } |
221 | 967f97fa | aliguori | |
222 | 26b258e1 | aliguori | for (i = 0; i < elem->out_num; i++) |
223 | 26b258e1 | aliguori | cpu_physical_memory_unmap(elem->out_sg[i].iov_base, |
224 | 26b258e1 | aliguori | elem->out_sg[i].iov_len, |
225 | 26b258e1 | aliguori | 0, elem->out_sg[i].iov_len);
|
226 | 26b258e1 | aliguori | |
227 | 967f97fa | aliguori | idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
228 | 967f97fa | aliguori | |
229 | 967f97fa | aliguori | /* Get a pointer to the next entry in the used ring. */
|
230 | 967f97fa | aliguori | vring_used_ring_id(vq, idx, elem->index); |
231 | 967f97fa | aliguori | vring_used_ring_len(vq, idx, len); |
232 | 967f97fa | aliguori | } |
233 | 967f97fa | aliguori | |
234 | 967f97fa | aliguori | void virtqueue_flush(VirtQueue *vq, unsigned int count) |
235 | 967f97fa | aliguori | { |
236 | 967f97fa | aliguori | /* Make sure buffer is written before we update index. */
|
237 | 967f97fa | aliguori | wmb(); |
238 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_flush(vq, count); |
239 | 967f97fa | aliguori | vring_used_idx_increment(vq, count); |
240 | 967f97fa | aliguori | vq->inuse -= count; |
241 | 967f97fa | aliguori | } |
242 | 967f97fa | aliguori | |
243 | 967f97fa | aliguori | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
244 | 967f97fa | aliguori | unsigned int len) |
245 | 967f97fa | aliguori | { |
246 | 967f97fa | aliguori | virtqueue_fill(vq, elem, len, 0);
|
247 | 967f97fa | aliguori | virtqueue_flush(vq, 1);
|
248 | 967f97fa | aliguori | } |
249 | 967f97fa | aliguori | |
250 | 967f97fa | aliguori | static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
251 | 967f97fa | aliguori | { |
252 | 967f97fa | aliguori | uint16_t num_heads = vring_avail_idx(vq) - idx; |
253 | 967f97fa | aliguori | |
254 | 967f97fa | aliguori | /* Check it isn't doing very strange things with descriptor numbers. */
|
255 | bb6834cf | aliguori | if (num_heads > vq->vring.num) {
|
256 | bb6834cf | aliguori | fprintf(stderr, "Guest moved used index from %u to %u",
|
257 | bb6834cf | aliguori | idx, vring_avail_idx(vq)); |
258 | bb6834cf | aliguori | exit(1);
|
259 | bb6834cf | aliguori | } |
260 | 967f97fa | aliguori | |
261 | 967f97fa | aliguori | return num_heads;
|
262 | 967f97fa | aliguori | } |
263 | 967f97fa | aliguori | |
264 | 967f97fa | aliguori | static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) |
265 | 967f97fa | aliguori | { |
266 | 967f97fa | aliguori | unsigned int head; |
267 | 967f97fa | aliguori | |
268 | 967f97fa | aliguori | /* Grab the next descriptor number they're advertising, and increment
|
269 | 967f97fa | aliguori | * the index we've seen. */
|
270 | 967f97fa | aliguori | head = vring_avail_ring(vq, idx % vq->vring.num); |
271 | 967f97fa | aliguori | |
272 | 967f97fa | aliguori | /* If their number is silly, that's a fatal mistake. */
|
273 | bb6834cf | aliguori | if (head >= vq->vring.num) {
|
274 | bb6834cf | aliguori | fprintf(stderr, "Guest says index %u is available", head);
|
275 | bb6834cf | aliguori | exit(1);
|
276 | bb6834cf | aliguori | } |
277 | 967f97fa | aliguori | |
278 | 967f97fa | aliguori | return head;
|
279 | 967f97fa | aliguori | } |
280 | 967f97fa | aliguori | |
281 | c227f099 | Anthony Liguori | static unsigned virtqueue_next_desc(target_phys_addr_t desc_pa, |
282 | 5774cf98 | Mark McLoughlin | unsigned int i, unsigned int max) |
283 | 967f97fa | aliguori | { |
284 | 967f97fa | aliguori | unsigned int next; |
285 | 967f97fa | aliguori | |
286 | 967f97fa | aliguori | /* If this descriptor says it doesn't chain, we're done. */
|
287 | 5774cf98 | Mark McLoughlin | if (!(vring_desc_flags(desc_pa, i) & VRING_DESC_F_NEXT))
|
288 | 5774cf98 | Mark McLoughlin | return max;
|
289 | 967f97fa | aliguori | |
290 | 967f97fa | aliguori | /* Check they're not leading us off end of descriptors. */
|
291 | 5774cf98 | Mark McLoughlin | next = vring_desc_next(desc_pa, i); |
292 | 967f97fa | aliguori | /* Make sure compiler knows to grab that: we don't want it changing! */
|
293 | 967f97fa | aliguori | wmb(); |
294 | 967f97fa | aliguori | |
295 | 5774cf98 | Mark McLoughlin | if (next >= max) {
|
296 | bb6834cf | aliguori | fprintf(stderr, "Desc next is %u", next);
|
297 | bb6834cf | aliguori | exit(1);
|
298 | bb6834cf | aliguori | } |
299 | 967f97fa | aliguori | |
300 | 967f97fa | aliguori | return next;
|
301 | 967f97fa | aliguori | } |
302 | 967f97fa | aliguori | |
303 | 967f97fa | aliguori | int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes) |
304 | 967f97fa | aliguori | { |
305 | efeea6d0 | Mark McLoughlin | unsigned int idx; |
306 | efeea6d0 | Mark McLoughlin | int total_bufs, in_total, out_total;
|
307 | 967f97fa | aliguori | |
308 | 967f97fa | aliguori | idx = vq->last_avail_idx; |
309 | 967f97fa | aliguori | |
310 | efeea6d0 | Mark McLoughlin | total_bufs = in_total = out_total = 0;
|
311 | 967f97fa | aliguori | while (virtqueue_num_heads(vq, idx)) {
|
312 | efeea6d0 | Mark McLoughlin | unsigned int max, num_bufs, indirect = 0; |
313 | c227f099 | Anthony Liguori | target_phys_addr_t desc_pa; |
314 | 967f97fa | aliguori | int i;
|
315 | 967f97fa | aliguori | |
316 | efeea6d0 | Mark McLoughlin | max = vq->vring.num; |
317 | efeea6d0 | Mark McLoughlin | num_bufs = total_bufs; |
318 | 967f97fa | aliguori | i = virtqueue_get_head(vq, idx++); |
319 | efeea6d0 | Mark McLoughlin | desc_pa = vq->vring.desc; |
320 | efeea6d0 | Mark McLoughlin | |
321 | efeea6d0 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
322 | efeea6d0 | Mark McLoughlin | if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
323 | efeea6d0 | Mark McLoughlin | fprintf(stderr, "Invalid size for indirect buffer table\n");
|
324 | efeea6d0 | Mark McLoughlin | exit(1);
|
325 | efeea6d0 | Mark McLoughlin | } |
326 | efeea6d0 | Mark McLoughlin | |
327 | efeea6d0 | Mark McLoughlin | /* If we've got too many, that implies a descriptor loop. */
|
328 | efeea6d0 | Mark McLoughlin | if (num_bufs >= max) {
|
329 | efeea6d0 | Mark McLoughlin | fprintf(stderr, "Looped descriptor");
|
330 | efeea6d0 | Mark McLoughlin | exit(1);
|
331 | efeea6d0 | Mark McLoughlin | } |
332 | efeea6d0 | Mark McLoughlin | |
333 | efeea6d0 | Mark McLoughlin | /* loop over the indirect descriptor table */
|
334 | efeea6d0 | Mark McLoughlin | indirect = 1;
|
335 | efeea6d0 | Mark McLoughlin | max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
|
336 | efeea6d0 | Mark McLoughlin | num_bufs = i = 0;
|
337 | efeea6d0 | Mark McLoughlin | desc_pa = vring_desc_addr(desc_pa, i); |
338 | efeea6d0 | Mark McLoughlin | } |
339 | efeea6d0 | Mark McLoughlin | |
340 | 967f97fa | aliguori | do {
|
341 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
|
342 | 5774cf98 | Mark McLoughlin | if (++num_bufs > max) {
|
343 | bb6834cf | aliguori | fprintf(stderr, "Looped descriptor");
|
344 | bb6834cf | aliguori | exit(1);
|
345 | bb6834cf | aliguori | } |
346 | 967f97fa | aliguori | |
347 | 5774cf98 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
|
348 | 967f97fa | aliguori | if (in_bytes > 0 && |
349 | 5774cf98 | Mark McLoughlin | (in_total += vring_desc_len(desc_pa, i)) >= in_bytes) |
350 | 967f97fa | aliguori | return 1; |
351 | 967f97fa | aliguori | } else {
|
352 | 967f97fa | aliguori | if (out_bytes > 0 && |
353 | 5774cf98 | Mark McLoughlin | (out_total += vring_desc_len(desc_pa, i)) >= out_bytes) |
354 | 967f97fa | aliguori | return 1; |
355 | 967f97fa | aliguori | } |
356 | 5774cf98 | Mark McLoughlin | } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
357 | efeea6d0 | Mark McLoughlin | |
358 | efeea6d0 | Mark McLoughlin | if (!indirect)
|
359 | efeea6d0 | Mark McLoughlin | total_bufs = num_bufs; |
360 | efeea6d0 | Mark McLoughlin | else
|
361 | efeea6d0 | Mark McLoughlin | total_bufs++; |
362 | 967f97fa | aliguori | } |
363 | 967f97fa | aliguori | |
364 | 967f97fa | aliguori | return 0; |
365 | 967f97fa | aliguori | } |
366 | 967f97fa | aliguori | |
367 | 42fb2e07 | Kevin Wolf | void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr, |
368 | 42fb2e07 | Kevin Wolf | size_t num_sg, int is_write)
|
369 | 42fb2e07 | Kevin Wolf | { |
370 | 42fb2e07 | Kevin Wolf | unsigned int i; |
371 | 42fb2e07 | Kevin Wolf | target_phys_addr_t len; |
372 | 42fb2e07 | Kevin Wolf | |
373 | 42fb2e07 | Kevin Wolf | for (i = 0; i < num_sg; i++) { |
374 | 42fb2e07 | Kevin Wolf | len = sg[i].iov_len; |
375 | 42fb2e07 | Kevin Wolf | sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); |
376 | 42fb2e07 | Kevin Wolf | if (sg[i].iov_base == NULL || len != sg[i].iov_len) { |
377 | 42fb2e07 | Kevin Wolf | fprintf(stderr, "virtio: trying to map MMIO memory\n");
|
378 | 42fb2e07 | Kevin Wolf | exit(1);
|
379 | 42fb2e07 | Kevin Wolf | } |
380 | 42fb2e07 | Kevin Wolf | } |
381 | 42fb2e07 | Kevin Wolf | } |
382 | 42fb2e07 | Kevin Wolf | |
383 | 967f97fa | aliguori | int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
|
384 | 967f97fa | aliguori | { |
385 | 5774cf98 | Mark McLoughlin | unsigned int i, head, max; |
386 | c227f099 | Anthony Liguori | target_phys_addr_t desc_pa = vq->vring.desc; |
387 | 967f97fa | aliguori | |
388 | 967f97fa | aliguori | if (!virtqueue_num_heads(vq, vq->last_avail_idx))
|
389 | 967f97fa | aliguori | return 0; |
390 | 967f97fa | aliguori | |
391 | 967f97fa | aliguori | /* When we start there are none of either input nor output. */
|
392 | 967f97fa | aliguori | elem->out_num = elem->in_num = 0;
|
393 | 967f97fa | aliguori | |
394 | 5774cf98 | Mark McLoughlin | max = vq->vring.num; |
395 | 5774cf98 | Mark McLoughlin | |
396 | 967f97fa | aliguori | i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
397 | efeea6d0 | Mark McLoughlin | |
398 | efeea6d0 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
399 | efeea6d0 | Mark McLoughlin | if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
400 | efeea6d0 | Mark McLoughlin | fprintf(stderr, "Invalid size for indirect buffer table\n");
|
401 | efeea6d0 | Mark McLoughlin | exit(1);
|
402 | efeea6d0 | Mark McLoughlin | } |
403 | efeea6d0 | Mark McLoughlin | |
404 | efeea6d0 | Mark McLoughlin | /* loop over the indirect descriptor table */
|
405 | efeea6d0 | Mark McLoughlin | max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
|
406 | efeea6d0 | Mark McLoughlin | desc_pa = vring_desc_addr(desc_pa, i); |
407 | efeea6d0 | Mark McLoughlin | i = 0;
|
408 | efeea6d0 | Mark McLoughlin | } |
409 | efeea6d0 | Mark McLoughlin | |
410 | 42fb2e07 | Kevin Wolf | /* Collect all the descriptors */
|
411 | 967f97fa | aliguori | do {
|
412 | 967f97fa | aliguori | struct iovec *sg;
|
413 | 967f97fa | aliguori | |
414 | 5774cf98 | Mark McLoughlin | if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
|
415 | 5774cf98 | Mark McLoughlin | elem->in_addr[elem->in_num] = vring_desc_addr(desc_pa, i); |
416 | 967f97fa | aliguori | sg = &elem->in_sg[elem->in_num++]; |
417 | 42fb2e07 | Kevin Wolf | } else {
|
418 | 42fb2e07 | Kevin Wolf | elem->out_addr[elem->out_num] = vring_desc_addr(desc_pa, i); |
419 | 967f97fa | aliguori | sg = &elem->out_sg[elem->out_num++]; |
420 | 42fb2e07 | Kevin Wolf | } |
421 | 967f97fa | aliguori | |
422 | 5774cf98 | Mark McLoughlin | sg->iov_len = vring_desc_len(desc_pa, i); |
423 | 967f97fa | aliguori | |
424 | 967f97fa | aliguori | /* If we've got too many, that implies a descriptor loop. */
|
425 | 5774cf98 | Mark McLoughlin | if ((elem->in_num + elem->out_num) > max) {
|
426 | bb6834cf | aliguori | fprintf(stderr, "Looped descriptor");
|
427 | bb6834cf | aliguori | exit(1);
|
428 | bb6834cf | aliguori | } |
429 | 5774cf98 | Mark McLoughlin | } while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
430 | 967f97fa | aliguori | |
431 | 42fb2e07 | Kevin Wolf | /* Now map what we have collected */
|
432 | 42fb2e07 | Kevin Wolf | virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1);
|
433 | 42fb2e07 | Kevin Wolf | virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0);
|
434 | 42fb2e07 | Kevin Wolf | |
435 | 967f97fa | aliguori | elem->index = head; |
436 | 967f97fa | aliguori | |
437 | 967f97fa | aliguori | vq->inuse++; |
438 | 967f97fa | aliguori | |
439 | 64979a4d | Stefan Hajnoczi | trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
440 | 967f97fa | aliguori | return elem->in_num + elem->out_num;
|
441 | 967f97fa | aliguori | } |
442 | 967f97fa | aliguori | |
443 | 967f97fa | aliguori | /* virtio device */
|
444 | 7055e687 | Michael S. Tsirkin | static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
445 | 7055e687 | Michael S. Tsirkin | { |
446 | 7055e687 | Michael S. Tsirkin | if (vdev->binding->notify) {
|
447 | 7055e687 | Michael S. Tsirkin | vdev->binding->notify(vdev->binding_opaque, vector); |
448 | 7055e687 | Michael S. Tsirkin | } |
449 | 7055e687 | Michael S. Tsirkin | } |
450 | 967f97fa | aliguori | |
451 | 53c25cea | Paul Brook | void virtio_update_irq(VirtIODevice *vdev)
|
452 | 967f97fa | aliguori | { |
453 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
454 | 967f97fa | aliguori | } |
455 | 967f97fa | aliguori | |
456 | 53c25cea | Paul Brook | void virtio_reset(void *opaque) |
457 | 967f97fa | aliguori | { |
458 | 967f97fa | aliguori | VirtIODevice *vdev = opaque; |
459 | 967f97fa | aliguori | int i;
|
460 | 967f97fa | aliguori | |
461 | 967f97fa | aliguori | if (vdev->reset)
|
462 | 967f97fa | aliguori | vdev->reset(vdev); |
463 | 967f97fa | aliguori | |
464 | 704a76fc | Michael S. Tsirkin | vdev->guest_features = 0;
|
465 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
466 | 967f97fa | aliguori | vdev->status = 0;
|
467 | 967f97fa | aliguori | vdev->isr = 0;
|
468 | 7055e687 | Michael S. Tsirkin | vdev->config_vector = VIRTIO_NO_VECTOR; |
469 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vdev->config_vector); |
470 | 967f97fa | aliguori | |
471 | 967f97fa | aliguori | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
472 | 967f97fa | aliguori | vdev->vq[i].vring.desc = 0;
|
473 | 967f97fa | aliguori | vdev->vq[i].vring.avail = 0;
|
474 | 967f97fa | aliguori | vdev->vq[i].vring.used = 0;
|
475 | 967f97fa | aliguori | vdev->vq[i].last_avail_idx = 0;
|
476 | 53c25cea | Paul Brook | vdev->vq[i].pa = 0;
|
477 | 7055e687 | Michael S. Tsirkin | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
478 | 967f97fa | aliguori | } |
479 | 967f97fa | aliguori | } |
480 | 967f97fa | aliguori | |
481 | 53c25cea | Paul Brook | uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
482 | 967f97fa | aliguori | { |
483 | 967f97fa | aliguori | uint8_t val; |
484 | 967f97fa | aliguori | |
485 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
486 | 967f97fa | aliguori | |
487 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
488 | 967f97fa | aliguori | return (uint32_t)-1; |
489 | 967f97fa | aliguori | |
490 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
491 | 967f97fa | aliguori | return val;
|
492 | 967f97fa | aliguori | } |
493 | 967f97fa | aliguori | |
494 | 53c25cea | Paul Brook | uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
495 | 967f97fa | aliguori | { |
496 | 967f97fa | aliguori | uint16_t val; |
497 | 967f97fa | aliguori | |
498 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
499 | 967f97fa | aliguori | |
500 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
501 | 967f97fa | aliguori | return (uint32_t)-1; |
502 | 967f97fa | aliguori | |
503 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
504 | 967f97fa | aliguori | return val;
|
505 | 967f97fa | aliguori | } |
506 | 967f97fa | aliguori | |
507 | 53c25cea | Paul Brook | uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
508 | 967f97fa | aliguori | { |
509 | 967f97fa | aliguori | uint32_t val; |
510 | 967f97fa | aliguori | |
511 | 967f97fa | aliguori | vdev->get_config(vdev, vdev->config); |
512 | 967f97fa | aliguori | |
513 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
514 | 967f97fa | aliguori | return (uint32_t)-1; |
515 | 967f97fa | aliguori | |
516 | 967f97fa | aliguori | memcpy(&val, vdev->config + addr, sizeof(val));
|
517 | 967f97fa | aliguori | return val;
|
518 | 967f97fa | aliguori | } |
519 | 967f97fa | aliguori | |
520 | 53c25cea | Paul Brook | void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
521 | 967f97fa | aliguori | { |
522 | 967f97fa | aliguori | uint8_t val = data; |
523 | 967f97fa | aliguori | |
524 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
525 | 967f97fa | aliguori | return;
|
526 | 967f97fa | aliguori | |
527 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
528 | 967f97fa | aliguori | |
529 | 967f97fa | aliguori | if (vdev->set_config)
|
530 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
531 | 967f97fa | aliguori | } |
532 | 967f97fa | aliguori | |
533 | 53c25cea | Paul Brook | void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
534 | 967f97fa | aliguori | { |
535 | 967f97fa | aliguori | uint16_t val = data; |
536 | 967f97fa | aliguori | |
537 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
538 | 967f97fa | aliguori | return;
|
539 | 967f97fa | aliguori | |
540 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
541 | 967f97fa | aliguori | |
542 | 967f97fa | aliguori | if (vdev->set_config)
|
543 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
544 | 967f97fa | aliguori | } |
545 | 967f97fa | aliguori | |
546 | 53c25cea | Paul Brook | void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
547 | 967f97fa | aliguori | { |
548 | 967f97fa | aliguori | uint32_t val = data; |
549 | 967f97fa | aliguori | |
550 | 967f97fa | aliguori | if (addr > (vdev->config_len - sizeof(val))) |
551 | 967f97fa | aliguori | return;
|
552 | 967f97fa | aliguori | |
553 | 967f97fa | aliguori | memcpy(vdev->config + addr, &val, sizeof(val));
|
554 | 967f97fa | aliguori | |
555 | 967f97fa | aliguori | if (vdev->set_config)
|
556 | 967f97fa | aliguori | vdev->set_config(vdev, vdev->config); |
557 | 967f97fa | aliguori | } |
558 | 967f97fa | aliguori | |
559 | c227f099 | Anthony Liguori | void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr) |
560 | 967f97fa | aliguori | { |
561 | 7055e687 | Michael S. Tsirkin | vdev->vq[n].pa = addr; |
562 | 7055e687 | Michael S. Tsirkin | virtqueue_init(&vdev->vq[n]); |
563 | 53c25cea | Paul Brook | } |
564 | 53c25cea | Paul Brook | |
565 | c227f099 | Anthony Liguori | target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
566 | 53c25cea | Paul Brook | { |
567 | 53c25cea | Paul Brook | return vdev->vq[n].pa;
|
568 | 53c25cea | Paul Brook | } |
569 | 53c25cea | Paul Brook | |
570 | 53c25cea | Paul Brook | int virtio_queue_get_num(VirtIODevice *vdev, int n) |
571 | 53c25cea | Paul Brook | { |
572 | 53c25cea | Paul Brook | return vdev->vq[n].vring.num;
|
573 | 53c25cea | Paul Brook | } |
574 | 967f97fa | aliguori | |
575 | 53c25cea | Paul Brook | void virtio_queue_notify(VirtIODevice *vdev, int n) |
576 | 53c25cea | Paul Brook | { |
577 | 53c25cea | Paul Brook | if (n < VIRTIO_PCI_QUEUE_MAX && vdev->vq[n].vring.desc) {
|
578 | 64979a4d | Stefan Hajnoczi | trace_virtio_queue_notify(vdev, n, &vdev->vq[n]); |
579 | 53c25cea | Paul Brook | vdev->vq[n].handle_output(vdev, &vdev->vq[n]); |
580 | 967f97fa | aliguori | } |
581 | 967f97fa | aliguori | } |
582 | 967f97fa | aliguori | |
583 | 7055e687 | Michael S. Tsirkin | uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
584 | 7055e687 | Michael S. Tsirkin | { |
585 | 7055e687 | Michael S. Tsirkin | return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector :
|
586 | 7055e687 | Michael S. Tsirkin | VIRTIO_NO_VECTOR; |
587 | 7055e687 | Michael S. Tsirkin | } |
588 | 7055e687 | Michael S. Tsirkin | |
589 | 7055e687 | Michael S. Tsirkin | void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) |
590 | 7055e687 | Michael S. Tsirkin | { |
591 | 7055e687 | Michael S. Tsirkin | if (n < VIRTIO_PCI_QUEUE_MAX)
|
592 | 7055e687 | Michael S. Tsirkin | vdev->vq[n].vector = vector; |
593 | 7055e687 | Michael S. Tsirkin | } |
594 | 7055e687 | Michael S. Tsirkin | |
595 | 967f97fa | aliguori | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
596 | 967f97fa | aliguori | void (*handle_output)(VirtIODevice *, VirtQueue *))
|
597 | 967f97fa | aliguori | { |
598 | 967f97fa | aliguori | int i;
|
599 | 967f97fa | aliguori | |
600 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
601 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
602 | 967f97fa | aliguori | break;
|
603 | 967f97fa | aliguori | } |
604 | 967f97fa | aliguori | |
605 | 967f97fa | aliguori | if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
606 | 967f97fa | aliguori | abort(); |
607 | 967f97fa | aliguori | |
608 | 967f97fa | aliguori | vdev->vq[i].vring.num = queue_size; |
609 | 967f97fa | aliguori | vdev->vq[i].handle_output = handle_output; |
610 | 967f97fa | aliguori | |
611 | 967f97fa | aliguori | return &vdev->vq[i];
|
612 | 967f97fa | aliguori | } |
613 | 967f97fa | aliguori | |
614 | 1cbdabe2 | Michael S. Tsirkin | void virtio_irq(VirtQueue *vq)
|
615 | 1cbdabe2 | Michael S. Tsirkin | { |
616 | 64979a4d | Stefan Hajnoczi | trace_virtio_irq(vq); |
617 | 1cbdabe2 | Michael S. Tsirkin | vq->vdev->isr |= 0x01;
|
618 | 1cbdabe2 | Michael S. Tsirkin | virtio_notify_vector(vq->vdev, vq->vector); |
619 | 1cbdabe2 | Michael S. Tsirkin | } |
620 | 1cbdabe2 | Michael S. Tsirkin | |
621 | 967f97fa | aliguori | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
622 | 967f97fa | aliguori | { |
623 | 97b83deb | aliguori | /* Always notify when queue is empty (when feature acknowledge) */
|
624 | 97b83deb | aliguori | if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
625 | 704a76fc | Michael S. Tsirkin | (!(vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
626 | 97b83deb | aliguori | (vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx))) |
627 | 967f97fa | aliguori | return;
|
628 | 967f97fa | aliguori | |
629 | 64979a4d | Stefan Hajnoczi | trace_virtio_notify(vdev, vq); |
630 | 967f97fa | aliguori | vdev->isr |= 0x01;
|
631 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vq->vector); |
632 | 967f97fa | aliguori | } |
633 | 967f97fa | aliguori | |
634 | 967f97fa | aliguori | void virtio_notify_config(VirtIODevice *vdev)
|
635 | 967f97fa | aliguori | { |
636 | 7625162c | aliguori | if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
637 | 7625162c | aliguori | return;
|
638 | 7625162c | aliguori | |
639 | 967f97fa | aliguori | vdev->isr |= 0x03;
|
640 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, vdev->config_vector); |
641 | 967f97fa | aliguori | } |
642 | 967f97fa | aliguori | |
643 | 967f97fa | aliguori | void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
644 | 967f97fa | aliguori | { |
645 | 967f97fa | aliguori | int i;
|
646 | 967f97fa | aliguori | |
647 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->save_config)
|
648 | ff24bd58 | Michael S. Tsirkin | vdev->binding->save_config(vdev->binding_opaque, f); |
649 | 967f97fa | aliguori | |
650 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->status); |
651 | 967f97fa | aliguori | qemu_put_8s(f, &vdev->isr); |
652 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->queue_sel); |
653 | 704a76fc | Michael S. Tsirkin | qemu_put_be32s(f, &vdev->guest_features); |
654 | 967f97fa | aliguori | qemu_put_be32(f, vdev->config_len); |
655 | 967f97fa | aliguori | qemu_put_buffer(f, vdev->config, vdev->config_len); |
656 | 967f97fa | aliguori | |
657 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
658 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
659 | 967f97fa | aliguori | break;
|
660 | 967f97fa | aliguori | } |
661 | 967f97fa | aliguori | |
662 | 967f97fa | aliguori | qemu_put_be32(f, i); |
663 | 967f97fa | aliguori | |
664 | 967f97fa | aliguori | for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
665 | 967f97fa | aliguori | if (vdev->vq[i].vring.num == 0) |
666 | 967f97fa | aliguori | break;
|
667 | 967f97fa | aliguori | |
668 | 967f97fa | aliguori | qemu_put_be32(f, vdev->vq[i].vring.num); |
669 | 53c25cea | Paul Brook | qemu_put_be64(f, vdev->vq[i].pa); |
670 | 967f97fa | aliguori | qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
671 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->save_queue)
|
672 | ff24bd58 | Michael S. Tsirkin | vdev->binding->save_queue(vdev->binding_opaque, i, f); |
673 | 967f97fa | aliguori | } |
674 | 967f97fa | aliguori | } |
675 | 967f97fa | aliguori | |
676 | ff24bd58 | Michael S. Tsirkin | int virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
677 | 967f97fa | aliguori | { |
678 | ff24bd58 | Michael S. Tsirkin | int num, i, ret;
|
679 | 6d74ca5a | Michael S. Tsirkin | uint32_t features; |
680 | 8172539d | Michael S. Tsirkin | uint32_t supported_features = |
681 | 6d74ca5a | Michael S. Tsirkin | vdev->binding->get_features(vdev->binding_opaque); |
682 | 967f97fa | aliguori | |
683 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->load_config) {
|
684 | ff24bd58 | Michael S. Tsirkin | ret = vdev->binding->load_config(vdev->binding_opaque, f); |
685 | ff24bd58 | Michael S. Tsirkin | if (ret)
|
686 | ff24bd58 | Michael S. Tsirkin | return ret;
|
687 | ff24bd58 | Michael S. Tsirkin | } |
688 | 967f97fa | aliguori | |
689 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->status); |
690 | 967f97fa | aliguori | qemu_get_8s(f, &vdev->isr); |
691 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->queue_sel); |
692 | 6d74ca5a | Michael S. Tsirkin | qemu_get_be32s(f, &features); |
693 | 6d74ca5a | Michael S. Tsirkin | if (features & ~supported_features) {
|
694 | 6d74ca5a | Michael S. Tsirkin | fprintf(stderr, "Features 0x%x unsupported. Allowed features: 0x%x\n",
|
695 | 6d74ca5a | Michael S. Tsirkin | features, supported_features); |
696 | 6d74ca5a | Michael S. Tsirkin | return -1; |
697 | 6d74ca5a | Michael S. Tsirkin | } |
698 | fae054b0 | Michael S. Tsirkin | if (vdev->set_features)
|
699 | fae054b0 | Michael S. Tsirkin | vdev->set_features(vdev, features); |
700 | 704a76fc | Michael S. Tsirkin | vdev->guest_features = features; |
701 | 967f97fa | aliguori | vdev->config_len = qemu_get_be32(f); |
702 | 967f97fa | aliguori | qemu_get_buffer(f, vdev->config, vdev->config_len); |
703 | 967f97fa | aliguori | |
704 | 967f97fa | aliguori | num = qemu_get_be32(f); |
705 | 967f97fa | aliguori | |
706 | 967f97fa | aliguori | for (i = 0; i < num; i++) { |
707 | 967f97fa | aliguori | vdev->vq[i].vring.num = qemu_get_be32(f); |
708 | 53c25cea | Paul Brook | vdev->vq[i].pa = qemu_get_be64(f); |
709 | 967f97fa | aliguori | qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
710 | 967f97fa | aliguori | |
711 | 53c25cea | Paul Brook | if (vdev->vq[i].pa) {
|
712 | 53c25cea | Paul Brook | virtqueue_init(&vdev->vq[i]); |
713 | 967f97fa | aliguori | } |
714 | ff24bd58 | Michael S. Tsirkin | if (vdev->binding->load_queue) {
|
715 | ff24bd58 | Michael S. Tsirkin | ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); |
716 | ff24bd58 | Michael S. Tsirkin | if (ret)
|
717 | ff24bd58 | Michael S. Tsirkin | return ret;
|
718 | 7055e687 | Michael S. Tsirkin | } |
719 | 967f97fa | aliguori | } |
720 | 967f97fa | aliguori | |
721 | 7055e687 | Michael S. Tsirkin | virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
722 | ff24bd58 | Michael S. Tsirkin | return 0; |
723 | 967f97fa | aliguori | } |
724 | 967f97fa | aliguori | |
725 | b946a153 | aliguori | void virtio_cleanup(VirtIODevice *vdev)
|
726 | b946a153 | aliguori | { |
727 | b946a153 | aliguori | if (vdev->config)
|
728 | b946a153 | aliguori | qemu_free(vdev->config); |
729 | b946a153 | aliguori | qemu_free(vdev->vq); |
730 | b946a153 | aliguori | } |
731 | b946a153 | aliguori | |
732 | 53c25cea | Paul Brook | VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, |
733 | 53c25cea | Paul Brook | size_t config_size, size_t struct_size) |
734 | 967f97fa | aliguori | { |
735 | 967f97fa | aliguori | VirtIODevice *vdev; |
736 | b8193adb | Michael S. Tsirkin | int i;
|
737 | 967f97fa | aliguori | |
738 | 53c25cea | Paul Brook | vdev = qemu_mallocz(struct_size); |
739 | 967f97fa | aliguori | |
740 | 53c25cea | Paul Brook | vdev->device_id = device_id; |
741 | 967f97fa | aliguori | vdev->status = 0;
|
742 | 967f97fa | aliguori | vdev->isr = 0;
|
743 | 967f97fa | aliguori | vdev->queue_sel = 0;
|
744 | 7055e687 | Michael S. Tsirkin | vdev->config_vector = VIRTIO_NO_VECTOR; |
745 | 967f97fa | aliguori | vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
746 | 1cbdabe2 | Michael S. Tsirkin | for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
747 | b8193adb | Michael S. Tsirkin | vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
748 | 1cbdabe2 | Michael S. Tsirkin | vdev->vq[i].vdev = vdev; |
749 | 1cbdabe2 | Michael S. Tsirkin | } |
750 | 967f97fa | aliguori | |
751 | 967f97fa | aliguori | vdev->name = name; |
752 | 967f97fa | aliguori | vdev->config_len = config_size; |
753 | 967f97fa | aliguori | if (vdev->config_len)
|
754 | 967f97fa | aliguori | vdev->config = qemu_mallocz(config_size); |
755 | 967f97fa | aliguori | else
|
756 | 967f97fa | aliguori | vdev->config = NULL;
|
757 | 967f97fa | aliguori | |
758 | 967f97fa | aliguori | return vdev;
|
759 | 967f97fa | aliguori | } |
760 | 53c25cea | Paul Brook | |
761 | 53c25cea | Paul Brook | void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, |
762 | 53c25cea | Paul Brook | void *opaque)
|
763 | 53c25cea | Paul Brook | { |
764 | 53c25cea | Paul Brook | vdev->binding = binding; |
765 | 53c25cea | Paul Brook | vdev->binding_opaque = opaque; |
766 | 53c25cea | Paul Brook | } |
767 | 1cbdabe2 | Michael S. Tsirkin | |
768 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
|
769 | 1cbdabe2 | Michael S. Tsirkin | { |
770 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.desc;
|
771 | 1cbdabe2 | Michael S. Tsirkin | } |
772 | 1cbdabe2 | Michael S. Tsirkin | |
773 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
|
774 | 1cbdabe2 | Michael S. Tsirkin | { |
775 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.avail;
|
776 | 1cbdabe2 | Michael S. Tsirkin | } |
777 | 1cbdabe2 | Michael S. Tsirkin | |
778 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
|
779 | 1cbdabe2 | Michael S. Tsirkin | { |
780 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.used;
|
781 | 1cbdabe2 | Michael S. Tsirkin | } |
782 | 1cbdabe2 | Michael S. Tsirkin | |
783 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n)
|
784 | 1cbdabe2 | Michael S. Tsirkin | { |
785 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.desc;
|
786 | 1cbdabe2 | Michael S. Tsirkin | } |
787 | 1cbdabe2 | Michael S. Tsirkin | |
788 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
|
789 | 1cbdabe2 | Michael S. Tsirkin | { |
790 | 1cbdabe2 | Michael S. Tsirkin | return sizeof(VRingDesc) * vdev->vq[n].vring.num; |
791 | 1cbdabe2 | Michael S. Tsirkin | } |
792 | 1cbdabe2 | Michael S. Tsirkin | |
793 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
|
794 | 1cbdabe2 | Michael S. Tsirkin | { |
795 | 1cbdabe2 | Michael S. Tsirkin | return offsetof(VRingAvail, ring) +
|
796 | 2b3af999 | Stefan Weil | sizeof(uint64_t) * vdev->vq[n].vring.num;
|
797 | 1cbdabe2 | Michael S. Tsirkin | } |
798 | 1cbdabe2 | Michael S. Tsirkin | |
799 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n)
|
800 | 1cbdabe2 | Michael S. Tsirkin | { |
801 | 1cbdabe2 | Michael S. Tsirkin | return offsetof(VRingUsed, ring) +
|
802 | 1cbdabe2 | Michael S. Tsirkin | sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
|
803 | 1cbdabe2 | Michael S. Tsirkin | } |
804 | 1cbdabe2 | Michael S. Tsirkin | |
805 | 1cbdabe2 | Michael S. Tsirkin | target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
|
806 | 1cbdabe2 | Michael S. Tsirkin | { |
807 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
|
808 | 1cbdabe2 | Michael S. Tsirkin | virtio_queue_get_used_size(vdev, n); |
809 | 1cbdabe2 | Michael S. Tsirkin | } |
810 | 1cbdabe2 | Michael S. Tsirkin | |
811 | 1cbdabe2 | Michael S. Tsirkin | uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
812 | 1cbdabe2 | Michael S. Tsirkin | { |
813 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq[n].last_avail_idx;
|
814 | 1cbdabe2 | Michael S. Tsirkin | } |
815 | 1cbdabe2 | Michael S. Tsirkin | |
816 | 1cbdabe2 | Michael S. Tsirkin | void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) |
817 | 1cbdabe2 | Michael S. Tsirkin | { |
818 | 1cbdabe2 | Michael S. Tsirkin | vdev->vq[n].last_avail_idx = idx; |
819 | 1cbdabe2 | Michael S. Tsirkin | } |
820 | 1cbdabe2 | Michael S. Tsirkin | |
821 | 1cbdabe2 | Michael S. Tsirkin | VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
822 | 1cbdabe2 | Michael S. Tsirkin | { |
823 | 1cbdabe2 | Michael S. Tsirkin | return vdev->vq + n;
|
824 | 1cbdabe2 | Michael S. Tsirkin | } |
825 | 1cbdabe2 | Michael S. Tsirkin | |
826 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
827 | 1cbdabe2 | Michael S. Tsirkin | { |
828 | 1cbdabe2 | Michael S. Tsirkin | return &vq->guest_notifier;
|
829 | 1cbdabe2 | Michael S. Tsirkin | } |
830 | 1cbdabe2 | Michael S. Tsirkin | EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
831 | 1cbdabe2 | Michael S. Tsirkin | { |
832 | 1cbdabe2 | Michael S. Tsirkin | return &vq->host_notifier;
|
833 | 1cbdabe2 | Michael S. Tsirkin | } |