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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 void 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}
43
44
45
46
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53
54
55
56irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
57{
58 struct rproc_vring *rvring;
59
60 dev_dbg(&rproc->dev, "vq index %d is interrupted\n", notifyid);
61
62 rvring = idr_find(&rproc->notifyids, notifyid);
63 if (!rvring || !rvring->vq)
64 return IRQ_NONE;
65
66 return vring_interrupt(0, rvring->vq);
67}
68EXPORT_SYMBOL(rproc_vq_interrupt);
69
70static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
71 unsigned id,
72 void (*callback)(struct virtqueue *vq),
73 const char *name)
74{
75 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
76 struct rproc *rproc = vdev_to_rproc(vdev);
77 struct device *dev = &rproc->dev;
78 struct rproc_vring *rvring;
79 struct virtqueue *vq;
80 void *addr;
81 int len, size, ret;
82
83
84 if (id >= ARRAY_SIZE(rvdev->vring))
85 return ERR_PTR(-EINVAL);
86
87 if (!name)
88 return NULL;
89
90 ret = rproc_alloc_vring(rvdev, id);
91 if (ret)
92 return ERR_PTR(ret);
93
94 rvring = &rvdev->vring[id];
95 addr = rvring->va;
96 len = rvring->len;
97
98
99 size = vring_size(len, rvring->align);
100 memset(addr, 0, size);
101
102 dev_dbg(dev, "vring%d: va %p qsz %d notifyid %d\n",
103 id, addr, len, rvring->notifyid);
104
105
106
107
108
109 vq = vring_new_virtqueue(id, len, rvring->align, vdev, false, addr,
110 rproc_virtio_notify, callback, name);
111 if (!vq) {
112 dev_err(dev, "vring_new_virtqueue %s failed\n", name);
113 rproc_free_vring(rvring);
114 return ERR_PTR(-ENOMEM);
115 }
116
117 rvring->vq = vq;
118 vq->priv = rvring;
119
120 return vq;
121}
122
123static void __rproc_virtio_del_vqs(struct virtio_device *vdev)
124{
125 struct virtqueue *vq, *n;
126 struct rproc_vring *rvring;
127
128 list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
129 rvring = vq->priv;
130 rvring->vq = NULL;
131 vring_del_virtqueue(vq);
132 rproc_free_vring(rvring);
133 }
134}
135
136static void rproc_virtio_del_vqs(struct virtio_device *vdev)
137{
138 struct rproc *rproc = vdev_to_rproc(vdev);
139
140
141 rproc_shutdown(rproc);
142
143 __rproc_virtio_del_vqs(vdev);
144}
145
146static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
147 struct virtqueue *vqs[],
148 vq_callback_t *callbacks[],
149 const char *names[])
150{
151 struct rproc *rproc = vdev_to_rproc(vdev);
152 int i, ret;
153
154 for (i = 0; i < nvqs; ++i) {
155 vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i]);
156 if (IS_ERR(vqs[i])) {
157 ret = PTR_ERR(vqs[i]);
158 goto error;
159 }
160 }
161
162
163 ret = rproc_boot(rproc);
164 if (ret) {
165 dev_err(&rproc->dev, "rproc_boot() failed %d\n", ret);
166 goto error;
167 }
168
169 return 0;
170
171error:
172 __rproc_virtio_del_vqs(vdev);
173 return ret;
174}
175
176static u8 rproc_virtio_get_status(struct virtio_device *vdev)
177{
178 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
179 struct fw_rsc_vdev *rsc;
180
181 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
182
183 return rsc->status;
184}
185
186static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
187{
188 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
189 struct fw_rsc_vdev *rsc;
190
191 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
192
193 rsc->status = status;
194 dev_dbg(&vdev->dev, "status: %d\n", status);
195}
196
197static void rproc_virtio_reset(struct virtio_device *vdev)
198{
199 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
200 struct fw_rsc_vdev *rsc;
201
202 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
203
204 rsc->status = 0;
205 dev_dbg(&vdev->dev, "reset !\n");
206}
207
208
209static u32 rproc_virtio_get_features(struct virtio_device *vdev)
210{
211 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
212 struct fw_rsc_vdev *rsc;
213
214 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
215
216 return rsc->dfeatures;
217}
218
219static void rproc_virtio_finalize_features(struct virtio_device *vdev)
220{
221 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
222 struct fw_rsc_vdev *rsc;
223
224 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
225
226
227 vring_transport_features(vdev);
228
229
230
231
232
233 rsc->gfeatures = vdev->features[0];
234}
235
236static void rproc_virtio_get(struct virtio_device *vdev, unsigned offset,
237 void *buf, unsigned len)
238{
239 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
240 struct fw_rsc_vdev *rsc;
241 void *cfg;
242
243 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
244 cfg = &rsc->vring[rsc->num_of_vrings];
245
246 if (offset + len > rsc->config_len || offset + len < len) {
247 dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n");
248 return;
249 }
250
251 memcpy(buf, cfg + offset, len);
252}
253
254static void rproc_virtio_set(struct virtio_device *vdev, unsigned offset,
255 const void *buf, unsigned len)
256{
257 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
258 struct fw_rsc_vdev *rsc;
259 void *cfg;
260
261 rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
262 cfg = &rsc->vring[rsc->num_of_vrings];
263
264 if (offset + len > rsc->config_len || offset + len < len) {
265 dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n");
266 return;
267 }
268
269 memcpy(cfg + offset, buf, len);
270}
271
272static const struct virtio_config_ops rproc_virtio_config_ops = {
273 .get_features = rproc_virtio_get_features,
274 .finalize_features = rproc_virtio_finalize_features,
275 .find_vqs = rproc_virtio_find_vqs,
276 .del_vqs = rproc_virtio_del_vqs,
277 .reset = rproc_virtio_reset,
278 .set_status = rproc_virtio_set_status,
279 .get_status = rproc_virtio_get_status,
280 .get = rproc_virtio_get,
281 .set = rproc_virtio_set,
282};
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291
292static void rproc_vdev_release(struct device *dev)
293{
294 struct virtio_device *vdev = dev_to_virtio(dev);
295 struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
296 struct rproc *rproc = vdev_to_rproc(vdev);
297
298 list_del(&rvdev->node);
299 kfree(rvdev);
300
301 put_device(&rproc->dev);
302}
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312
313int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
314{
315 struct rproc *rproc = rvdev->rproc;
316 struct device *dev = &rproc->dev;
317 struct virtio_device *vdev = &rvdev->vdev;
318 int ret;
319
320 vdev->id.device = id,
321 vdev->config = &rproc_virtio_config_ops,
322 vdev->dev.parent = dev;
323 vdev->dev.release = rproc_vdev_release;
324
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330
331
332
333 get_device(&rproc->dev);
334
335 ret = register_virtio_device(vdev);
336 if (ret) {
337 put_device(&rproc->dev);
338 dev_err(dev, "failed to register vdev: %d\n", ret);
339 goto out;
340 }
341
342 dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
343
344out:
345 return ret;
346}
347
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352
353
354void rproc_remove_virtio_dev(struct rproc_vdev *rvdev)
355{
356 unregister_virtio_device(&rvdev->vdev);
357}
358