1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#include <linux/export.h>
21#include <linux/remoteproc.h>
22#include <linux/virtio.h>
23#include <linux/virtio_config.h>
24#include <linux/virtio_ids.h>
25#include <linux/virtio_ring.h>
26#include <linux/err.h>
27#include <linux/kref.h>
28#include <linux/slab.h>
29
30#include "remoteproc_internal.h"
31
32
33static bool rproc_virtio_notify(struct virtqueue *vq)
34{
35 struct rproc_vring *rvring = vq->priv;
36 struct rproc *rproc = rvring->rvdev->rproc;
37 int notifyid = rvring->notifyid;
38
39 dev_dbg(&rproc->dev, "kicking vq index: %d\n", notifyid);
40
41 rproc->ops->kick(rproc, notifyid);
42 return true;
43}
44
45
46
47
48
49
50
51
52
53
54
55
56
57irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
58{
59 struct rproc_vring *rvring;
60
61 dev_dbg(&rproc->dev, "vq index %d is interrupted\n", notifyid);
62
63 rvring = idr_find(&rproc->notifyids, notifyid);
64 if (!rvring || !rvring->vq)
65 return IRQ_NONE;
66
67 return vring_interrupt(0, rvring->vq);
68}
69EXPORT_SYMBOL(rproc_vq_interrupt);
70
71static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
72 unsigned int id,
73 void (*callback)(struct virtqueue *vq),
74 const char *name, bool ctx)
75{
76 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
77 struct rproc *rproc = vdev_to_rproc(vdev);
78 struct device *dev = &rproc->dev;
79 struct rproc_vring *rvring;
80 struct virtqueue *vq;
81 void *addr;
82 int len, size;
83
84
85 if (id >= ARRAY_SIZE(rvdev->vring))
86 return ERR_PTR(-EINVAL);
87
88 if (!name)
89 return NULL;
90
91 rvring = &rvdev->vring[id];
92 addr = rvring->va;
93 len = rvring->len;
94
95
96 size = vring_size(len, rvring->align);
97 memset(addr, 0, size);
98
99 dev_dbg(dev, "vring%d: va %p qsz %d notifyid %d\n",
100 id, addr, len, rvring->notifyid);
101
102
103
104
105
106 vq = vring_new_virtqueue(id, len, rvring->align, vdev, false, ctx,
107 addr, rproc_virtio_notify, callback, name);
108 if (!vq) {
109 dev_err(dev, "vring_new_virtqueue %s failed\n", name);
110 rproc_free_vring(rvring);
111 return ERR_PTR(-ENOMEM);
112 }
113
114 rvring->vq = vq;
115 vq->priv = rvring;
116
117 return vq;
118}
119
120static void __rproc_virtio_del_vqs(struct virtio_device *vdev)
121{
122 struct virtqueue *vq, *n;
123 struct rproc_vring *rvring;
124
125 list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
126 rvring = vq->priv;
127 rvring->vq = NULL;
128 vring_del_virtqueue(vq);
129 }
130}
131
132static void rproc_virtio_del_vqs(struct virtio_device *vdev)
133{
134 __rproc_virtio_del_vqs(vdev);
135}
136
137static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
138 struct virtqueue *vqs[],
139 vq_callback_t *callbacks[],
140 const char * const names[],
141 const bool * ctx,
142 struct irq_affinity *desc)
143{
144 int i, ret;
145
146 for (i = 0; i < nvqs; ++i) {
147 vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i],
148 ctx ? ctx[i] : false);
149 if (IS_ERR(vqs[i])) {
150 ret = PTR_ERR(vqs[i]);
151 goto error;
152 }
153 }
154
155 return 0;
156
157error:
158 __rproc_virtio_del_vqs(vdev);
159 return ret;
160}
161
162static u8 rproc_virtio_get_status(struct virtio_device *vdev)
163{
164 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
165 struct fw_rsc_vdev *rsc;
166
167 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
168
169 return rsc->status;
170}
171
172static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
173{
174 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
175 struct fw_rsc_vdev *rsc;
176
177 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
178
179 rsc->status = status;
180 dev_dbg(&vdev->dev, "status: %d\n", status);
181}
182
183static void rproc_virtio_reset(struct virtio_device *vdev)
184{
185 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
186 struct fw_rsc_vdev *rsc;
187
188 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
189
190 rsc->status = 0;
191 dev_dbg(&vdev->dev, "reset !\n");
192}
193
194
195static u64 rproc_virtio_get_features(struct virtio_device *vdev)
196{
197 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
198 struct fw_rsc_vdev *rsc;
199
200 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
201
202 return rsc->dfeatures;
203}
204
205static int rproc_virtio_finalize_features(struct virtio_device *vdev)
206{
207 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
208 struct fw_rsc_vdev *rsc;
209
210 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
211
212
213 vring_transport_features(vdev);
214
215
216 BUG_ON((u32)vdev->features != vdev->features);
217
218
219
220
221
222 rsc->gfeatures = vdev->features;
223
224 return 0;
225}
226
227static void rproc_virtio_get(struct virtio_device *vdev, unsigned int offset,
228 void *buf, unsigned int len)
229{
230 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
231 struct fw_rsc_vdev *rsc;
232 void *cfg;
233
234 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
235 cfg = &rsc->vring[rsc->num_of_vrings];
236
237 if (offset + len > rsc->config_len || offset + len < len) {
238 dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n");
239 return;
240 }
241
242 memcpy(buf, cfg + offset, len);
243}
244
245static void rproc_virtio_set(struct virtio_device *vdev, unsigned int offset,
246 const void *buf, unsigned int len)
247{
248 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
249 struct fw_rsc_vdev *rsc;
250 void *cfg;
251
252 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
253 cfg = &rsc->vring[rsc->num_of_vrings];
254
255 if (offset + len > rsc->config_len || offset + len < len) {
256 dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n");
257 return;
258 }
259
260 memcpy(cfg + offset, buf, len);
261}
262
263static const struct virtio_config_ops rproc_virtio_config_ops = {
264 .get_features = rproc_virtio_get_features,
265 .finalize_features = rproc_virtio_finalize_features,
266 .find_vqs = rproc_virtio_find_vqs,
267 .del_vqs = rproc_virtio_del_vqs,
268 .reset = rproc_virtio_reset,
269 .set_status = rproc_virtio_set_status,
270 .get_status = rproc_virtio_get_status,
271 .get = rproc_virtio_get,
272 .set = rproc_virtio_set,
273};
274
275
276
277
278
279
280
281
282
283static void rproc_virtio_dev_release(struct device *dev)
284{
285 struct virtio_device *vdev = dev_to_virtio(dev);
286 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
287 struct rproc *rproc = vdev_to_rproc(vdev);
288
289 kref_put(&rvdev->refcount, rproc_vdev_release);
290
291 put_device(&rproc->dev);
292}
293
294
295
296
297
298
299
300
301
302
303int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
304{
305 struct rproc *rproc = rvdev->rproc;
306 struct device *dev = &rproc->dev;
307 struct virtio_device *vdev = &rvdev->vdev;
308 int ret;
309
310 vdev->id.device = id,
311 vdev->config = &rproc_virtio_config_ops,
312 vdev->dev.parent = dev;
313 vdev->dev.release = rproc_virtio_dev_release;
314
315
316
317
318
319
320
321
322
323 get_device(&rproc->dev);
324
325
326 kref_get(&rvdev->refcount);
327
328 ret = register_virtio_device(vdev);
329 if (ret) {
330 put_device(&vdev->dev);
331 dev_err(dev, "failed to register vdev: %d\n", ret);
332 goto out;
333 }
334
335 dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
336
337out:
338 return ret;
339}
340
341
342
343
344
345
346
347void rproc_remove_virtio_dev(struct rproc_vdev *rvdev)
348{
349 unregister_virtio_device(&rvdev->vdev);
350}
351