sm501: Add missing arbitration control register
[qemu.git] / hw / 9pfs / virtio-9p-device.c
1 /*
2 * Virtio 9p backend
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14 #include "qemu/osdep.h"
15 #include "hw/virtio/virtio.h"
16 #include "qemu/sockets.h"
17 #include "virtio-9p.h"
18 #include "fsdev/qemu-fsdev.h"
19 #include "coth.h"
20 #include "hw/virtio/virtio-access.h"
21 #include "qemu/iov.h"
22
23 static const struct V9fsTransport virtio_9p_transport;
24
25 static void virtio_9p_push_and_notify(V9fsPDU *pdu)
26 {
27 V9fsState *s = pdu->s;
28 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
29 VirtQueueElement *elem = v->elems[pdu->idx];
30
31 /* push onto queue and notify */
32 virtqueue_push(v->vq, elem, pdu->size);
33 g_free(elem);
34 v->elems[pdu->idx] = NULL;
35
36 /* FIXME: we should batch these completions */
37 virtio_notify(VIRTIO_DEVICE(v), v->vq);
38 }
39
40 static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
41 {
42 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
43 V9fsState *s = &v->state;
44 V9fsPDU *pdu;
45 ssize_t len;
46 VirtQueueElement *elem;
47
48 while ((pdu = pdu_alloc(s))) {
49 struct {
50 uint32_t size_le;
51 uint8_t id;
52 uint16_t tag_le;
53 } QEMU_PACKED out;
54
55 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
56 if (!elem) {
57 goto out_free_pdu;
58 }
59
60 if (elem->in_num == 0) {
61 virtio_error(vdev,
62 "The guest sent a VirtFS request without space for "
63 "the reply");
64 goto out_free_req;
65 }
66 QEMU_BUILD_BUG_ON(sizeof(out) != 7);
67
68 v->elems[pdu->idx] = elem;
69 len = iov_to_buf(elem->out_sg, elem->out_num, 0,
70 &out, sizeof(out));
71 if (len != sizeof(out)) {
72 virtio_error(vdev, "The guest sent a malformed VirtFS request: "
73 "header size is %zd, should be 7", len);
74 goto out_free_req;
75 }
76
77 pdu->size = le32_to_cpu(out.size_le);
78
79 pdu->id = out.id;
80 pdu->tag = le16_to_cpu(out.tag_le);
81
82 qemu_co_queue_init(&pdu->complete);
83 pdu_submit(pdu);
84 }
85
86 return;
87
88 out_free_req:
89 virtqueue_detach_element(vq, elem, 0);
90 g_free(elem);
91 out_free_pdu:
92 pdu_free(pdu);
93 }
94
95 static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
96 Error **errp)
97 {
98 virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
99 return features;
100 }
101
102 static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
103 {
104 int len;
105 struct virtio_9p_config *cfg;
106 V9fsVirtioState *v = VIRTIO_9P(vdev);
107 V9fsState *s = &v->state;
108
109 len = strlen(s->tag);
110 cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
111 virtio_stw_p(vdev, &cfg->tag_len, len);
112 /* We don't copy the terminating null to config space */
113 memcpy(cfg->tag, s->tag, len);
114 memcpy(config, cfg, v->config_size);
115 g_free(cfg);
116 }
117
118 static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
119 {
120 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
121 V9fsVirtioState *v = VIRTIO_9P(dev);
122 V9fsState *s = &v->state;
123
124 if (v9fs_device_realize_common(s, errp)) {
125 goto out;
126 }
127
128 v->config_size = sizeof(struct virtio_9p_config) + strlen(s->fsconf.tag);
129 virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P, v->config_size);
130 v->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output);
131 v9fs_register_transport(s, &virtio_9p_transport);
132
133 out:
134 return;
135 }
136
137 static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
138 {
139 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
140 V9fsVirtioState *v = VIRTIO_9P(dev);
141 V9fsState *s = &v->state;
142
143 virtio_cleanup(vdev);
144 v9fs_device_unrealize_common(s, errp);
145 }
146
147 static void virtio_9p_reset(VirtIODevice *vdev)
148 {
149 V9fsVirtioState *v = (V9fsVirtioState *)vdev;
150
151 v9fs_reset(&v->state);
152 }
153
154 static ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
155 const char *fmt, va_list ap)
156 {
157 V9fsState *s = pdu->s;
158 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
159 VirtQueueElement *elem = v->elems[pdu->idx];
160
161 return v9fs_iov_vmarshal(elem->in_sg, elem->in_num, offset, 1, fmt, ap);
162 }
163
164 static ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
165 const char *fmt, va_list ap)
166 {
167 V9fsState *s = pdu->s;
168 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
169 VirtQueueElement *elem = v->elems[pdu->idx];
170
171 return v9fs_iov_vunmarshal(elem->out_sg, elem->out_num, offset, 1, fmt, ap);
172 }
173
174 /* The size parameter is used by other transports. Do not drop it. */
175 static void virtio_init_in_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
176 unsigned int *pniov, size_t size)
177 {
178 V9fsState *s = pdu->s;
179 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
180 VirtQueueElement *elem = v->elems[pdu->idx];
181
182 *piov = elem->in_sg;
183 *pniov = elem->in_num;
184 }
185
186 static void virtio_init_out_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
187 unsigned int *pniov)
188 {
189 V9fsState *s = pdu->s;
190 V9fsVirtioState *v = container_of(s, V9fsVirtioState, state);
191 VirtQueueElement *elem = v->elems[pdu->idx];
192
193 *piov = elem->out_sg;
194 *pniov = elem->out_num;
195 }
196
197 static const struct V9fsTransport virtio_9p_transport = {
198 .pdu_vmarshal = virtio_pdu_vmarshal,
199 .pdu_vunmarshal = virtio_pdu_vunmarshal,
200 .init_in_iov_from_pdu = virtio_init_in_iov_from_pdu,
201 .init_out_iov_from_pdu = virtio_init_out_iov_from_pdu,
202 .push_and_notify = virtio_9p_push_and_notify,
203 };
204
205 /* virtio-9p device */
206
207 static const VMStateDescription vmstate_virtio_9p = {
208 .name = "virtio-9p",
209 .minimum_version_id = 1,
210 .version_id = 1,
211 .fields = (VMStateField[]) {
212 VMSTATE_VIRTIO_DEVICE,
213 VMSTATE_END_OF_LIST()
214 },
215 };
216
217 static Property virtio_9p_properties[] = {
218 DEFINE_PROP_STRING("mount_tag", V9fsVirtioState, state.fsconf.tag),
219 DEFINE_PROP_STRING("fsdev", V9fsVirtioState, state.fsconf.fsdev_id),
220 DEFINE_PROP_END_OF_LIST(),
221 };
222
223 static void virtio_9p_class_init(ObjectClass *klass, void *data)
224 {
225 DeviceClass *dc = DEVICE_CLASS(klass);
226 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
227
228 dc->props = virtio_9p_properties;
229 dc->vmsd = &vmstate_virtio_9p;
230 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
231 vdc->realize = virtio_9p_device_realize;
232 vdc->unrealize = virtio_9p_device_unrealize;
233 vdc->get_features = virtio_9p_get_features;
234 vdc->get_config = virtio_9p_get_config;
235 vdc->reset = virtio_9p_reset;
236 }
237
238 static const TypeInfo virtio_device_info = {
239 .name = TYPE_VIRTIO_9P,
240 .parent = TYPE_VIRTIO_DEVICE,
241 .instance_size = sizeof(V9fsVirtioState),
242 .class_init = virtio_9p_class_init,
243 };
244
245 static void virtio_9p_register_types(void)
246 {
247 type_register_static(&virtio_device_info);
248 }
249
250 type_init(virtio_9p_register_types)