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ac8954a4 OBC |
1 | /* |
2 | * Remote processor messaging transport (OMAP platform-specific bits) | |
3 | * | |
4 | * Copyright (C) 2011 Texas Instruments, Inc. | |
5 | * Copyright (C) 2011 Google, Inc. | |
6 | * | |
7 | * Ohad Ben-Cohen <ohad@wizery.com> | |
8 | * Brian Swetland <swetland@google.com> | |
9 | * | |
10 | * This software is licensed under the terms of the GNU General Public | |
11 | * License version 2, as published by the Free Software Foundation, and | |
12 | * may be copied, distributed, and modified under those terms. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | #include <linux/export.h> | |
21 | #include <linux/remoteproc.h> | |
ac8954a4 OBC |
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 | ||
ac8954a4 | 32 | /* kick the remote processor, and let it know which virtqueue to poke at */ |
46f9c2b9 | 33 | static bool rproc_virtio_notify(struct virtqueue *vq) |
ac8954a4 | 34 | { |
7a186941 OBC |
35 | struct rproc_vring *rvring = vq->priv; |
36 | struct rproc *rproc = rvring->rvdev->rproc; | |
37 | int notifyid = rvring->notifyid; | |
ac8954a4 | 38 | |
b5ab5e24 | 39 | dev_dbg(&rproc->dev, "kicking vq index: %d\n", notifyid); |
ac8954a4 | 40 | |
7a186941 | 41 | rproc->ops->kick(rproc, notifyid); |
46f9c2b9 | 42 | return true; |
ac8954a4 OBC |
43 | } |
44 | ||
45 | /** | |
46 | * rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted | |
47 | * @rproc: handle to the remote processor | |
7a186941 | 48 | * @notifyid: index of the signalled virtqueue (unique per this @rproc) |
ac8954a4 OBC |
49 | * |
50 | * This function should be called by the platform-specific rproc driver, | |
51 | * when the remote processor signals that a specific virtqueue has pending | |
52 | * messages available. | |
53 | * | |
7a186941 | 54 | * Returns IRQ_NONE if no message was found in the @notifyid virtqueue, |
ac8954a4 OBC |
55 | * and otherwise returns IRQ_HANDLED. |
56 | */ | |
7a186941 | 57 | irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid) |
ac8954a4 | 58 | { |
7a186941 OBC |
59 | struct rproc_vring *rvring; |
60 | ||
b5ab5e24 | 61 | dev_dbg(&rproc->dev, "vq index %d is interrupted\n", notifyid); |
7a186941 OBC |
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); | |
ac8954a4 OBC |
68 | } |
69 | EXPORT_SYMBOL(rproc_vq_interrupt); | |
70 | ||
71 | static struct virtqueue *rp_find_vq(struct virtio_device *vdev, | |
f145928d | 72 | unsigned int id, |
ac8954a4 OBC |
73 | void (*callback)(struct virtqueue *vq), |
74 | const char *name) | |
75 | { | |
7a186941 | 76 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
ac8954a4 | 77 | struct rproc *rproc = vdev_to_rproc(vdev); |
b5ab5e24 | 78 | struct device *dev = &rproc->dev; |
7a186941 | 79 | struct rproc_vring *rvring; |
ac8954a4 OBC |
80 | struct virtqueue *vq; |
81 | void *addr; | |
a863af5d | 82 | int len, size; |
ac8954a4 | 83 | |
7a186941 OBC |
84 | /* we're temporarily limited to two virtqueues per rvdev */ |
85 | if (id >= ARRAY_SIZE(rvdev->vring)) | |
86 | return ERR_PTR(-EINVAL); | |
87 | ||
6457f126 MT |
88 | if (!name) |
89 | return NULL; | |
90 | ||
6db20ea8 | 91 | rvring = &rvdev->vring[id]; |
7a186941 OBC |
92 | addr = rvring->va; |
93 | len = rvring->len; | |
ac8954a4 | 94 | |
7a186941 OBC |
95 | /* zero vring */ |
96 | size = vring_size(len, rvring->align); | |
97 | memset(addr, 0, size); | |
ac8954a4 | 98 | |
b5ab5e24 | 99 | dev_dbg(dev, "vring%d: va %p qsz %d notifyid %d\n", |
730f84ce | 100 | id, addr, len, rvring->notifyid); |
ac8954a4 | 101 | |
dd6da1c5 OBC |
102 | /* |
103 | * Create the new vq, and tell virtio we're not interested in | |
104 | * the 'weak' smp barriers, since we're talking with a real device. | |
105 | */ | |
17bb6d40 | 106 | vq = vring_new_virtqueue(id, len, rvring->align, vdev, false, addr, |
730f84ce | 107 | rproc_virtio_notify, callback, name); |
ac8954a4 | 108 | if (!vq) { |
b5ab5e24 | 109 | dev_err(dev, "vring_new_virtqueue %s failed\n", name); |
6db20ea8 | 110 | rproc_free_vring(rvring); |
7a186941 | 111 | return ERR_PTR(-ENOMEM); |
ac8954a4 OBC |
112 | } |
113 | ||
7a186941 OBC |
114 | rvring->vq = vq; |
115 | vq->priv = rvring; | |
ac8954a4 OBC |
116 | |
117 | return vq; | |
ac8954a4 OBC |
118 | } |
119 | ||
dab55bba | 120 | static void __rproc_virtio_del_vqs(struct virtio_device *vdev) |
ac8954a4 OBC |
121 | { |
122 | struct virtqueue *vq, *n; | |
7a186941 | 123 | struct rproc_vring *rvring; |
ac8954a4 OBC |
124 | |
125 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) { | |
7a186941 OBC |
126 | rvring = vq->priv; |
127 | rvring->vq = NULL; | |
ac8954a4 | 128 | vring_del_virtqueue(vq); |
ac8954a4 | 129 | } |
ac8954a4 OBC |
130 | } |
131 | ||
dab55bba OBC |
132 | static void rproc_virtio_del_vqs(struct virtio_device *vdev) |
133 | { | |
dab55bba OBC |
134 | __rproc_virtio_del_vqs(vdev); |
135 | } | |
136 | ||
f145928d | 137 | static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs, |
730f84ce AS |
138 | struct virtqueue *vqs[], |
139 | vq_callback_t *callbacks[], | |
fb5e31d9 CH |
140 | const char * const names[], |
141 | struct irq_affinity *desc) | |
ac8954a4 | 142 | { |
ac8954a4 OBC |
143 | int i, ret; |
144 | ||
ac8954a4 OBC |
145 | for (i = 0; i < nvqs; ++i) { |
146 | vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i]); | |
147 | if (IS_ERR(vqs[i])) { | |
148 | ret = PTR_ERR(vqs[i]); | |
149 | goto error; | |
150 | } | |
151 | } | |
152 | ||
153 | return 0; | |
154 | ||
155 | error: | |
dab55bba | 156 | __rproc_virtio_del_vqs(vdev); |
ac8954a4 OBC |
157 | return ret; |
158 | } | |
159 | ||
ac8954a4 OBC |
160 | static u8 rproc_virtio_get_status(struct virtio_device *vdev) |
161 | { | |
92b38f85 SB |
162 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
163 | struct fw_rsc_vdev *rsc; | |
164 | ||
165 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
166 | ||
167 | return rsc->status; | |
ac8954a4 OBC |
168 | } |
169 | ||
170 | static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status) | |
171 | { | |
92b38f85 SB |
172 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
173 | struct fw_rsc_vdev *rsc; | |
174 | ||
175 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
176 | ||
177 | rsc->status = status; | |
7a186941 | 178 | dev_dbg(&vdev->dev, "status: %d\n", status); |
ac8954a4 OBC |
179 | } |
180 | ||
181 | static void rproc_virtio_reset(struct virtio_device *vdev) | |
182 | { | |
92b38f85 SB |
183 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
184 | struct fw_rsc_vdev *rsc; | |
185 | ||
186 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
187 | ||
188 | rsc->status = 0; | |
ac8954a4 OBC |
189 | dev_dbg(&vdev->dev, "reset !\n"); |
190 | } | |
191 | ||
192 | /* provide the vdev features as retrieved from the firmware */ | |
d0254773 | 193 | static u64 rproc_virtio_get_features(struct virtio_device *vdev) |
ac8954a4 | 194 | { |
7a186941 | 195 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
92b38f85 SB |
196 | struct fw_rsc_vdev *rsc; |
197 | ||
198 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
ac8954a4 | 199 | |
92b38f85 | 200 | return rsc->dfeatures; |
ac8954a4 OBC |
201 | } |
202 | ||
5c609a5e | 203 | static int rproc_virtio_finalize_features(struct virtio_device *vdev) |
ac8954a4 | 204 | { |
7a186941 | 205 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
92b38f85 SB |
206 | struct fw_rsc_vdev *rsc; |
207 | ||
208 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
ac8954a4 OBC |
209 | |
210 | /* Give virtio_ring a chance to accept features */ | |
211 | vring_transport_features(vdev); | |
212 | ||
93d389f8 MT |
213 | /* Make sure we don't have any features > 32 bits! */ |
214 | BUG_ON((u32)vdev->features != vdev->features); | |
215 | ||
ac8954a4 OBC |
216 | /* |
217 | * Remember the finalized features of our vdev, and provide it | |
218 | * to the remote processor once it is powered on. | |
ac8954a4 | 219 | */ |
e16e12be | 220 | rsc->gfeatures = vdev->features; |
5c609a5e MT |
221 | |
222 | return 0; | |
92b38f85 SB |
223 | } |
224 | ||
f145928d AS |
225 | static void rproc_virtio_get(struct virtio_device *vdev, unsigned int offset, |
226 | void *buf, unsigned int len) | |
92b38f85 SB |
227 | { |
228 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); | |
229 | struct fw_rsc_vdev *rsc; | |
230 | void *cfg; | |
231 | ||
232 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
233 | cfg = &rsc->vring[rsc->num_of_vrings]; | |
234 | ||
235 | if (offset + len > rsc->config_len || offset + len < len) { | |
236 | dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n"); | |
237 | return; | |
238 | } | |
239 | ||
240 | memcpy(buf, cfg + offset, len); | |
241 | } | |
242 | ||
f145928d AS |
243 | static void rproc_virtio_set(struct virtio_device *vdev, unsigned int offset, |
244 | const void *buf, unsigned int len) | |
92b38f85 SB |
245 | { |
246 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); | |
247 | struct fw_rsc_vdev *rsc; | |
248 | void *cfg; | |
249 | ||
250 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
251 | cfg = &rsc->vring[rsc->num_of_vrings]; | |
252 | ||
253 | if (offset + len > rsc->config_len || offset + len < len) { | |
254 | dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n"); | |
255 | return; | |
256 | } | |
257 | ||
258 | memcpy(cfg + offset, buf, len); | |
ac8954a4 OBC |
259 | } |
260 | ||
93503932 | 261 | static const struct virtio_config_ops rproc_virtio_config_ops = { |
ac8954a4 OBC |
262 | .get_features = rproc_virtio_get_features, |
263 | .finalize_features = rproc_virtio_finalize_features, | |
264 | .find_vqs = rproc_virtio_find_vqs, | |
265 | .del_vqs = rproc_virtio_del_vqs, | |
266 | .reset = rproc_virtio_reset, | |
267 | .set_status = rproc_virtio_set_status, | |
268 | .get_status = rproc_virtio_get_status, | |
92b38f85 SB |
269 | .get = rproc_virtio_get, |
270 | .set = rproc_virtio_set, | |
ac8954a4 OBC |
271 | }; |
272 | ||
273 | /* | |
274 | * This function is called whenever vdev is released, and is responsible | |
7183a2a7 | 275 | * to decrement the remote processor's refcount which was taken when vdev was |
ac8954a4 OBC |
276 | * added. |
277 | * | |
278 | * Never call this function directly; it will be called by the driver | |
279 | * core when needed. | |
280 | */ | |
aab8d802 | 281 | static void rproc_virtio_dev_release(struct device *dev) |
ac8954a4 OBC |
282 | { |
283 | struct virtio_device *vdev = dev_to_virtio(dev); | |
6db20ea8 | 284 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
ac8954a4 OBC |
285 | struct rproc *rproc = vdev_to_rproc(vdev); |
286 | ||
aab8d802 | 287 | kref_put(&rvdev->refcount, rproc_vdev_release); |
6db20ea8 | 288 | |
7183a2a7 | 289 | put_device(&rproc->dev); |
ac8954a4 OBC |
290 | } |
291 | ||
292 | /** | |
7a186941 OBC |
293 | * rproc_add_virtio_dev() - register an rproc-induced virtio device |
294 | * @rvdev: the remote vdev | |
ac8954a4 | 295 | * |
7a186941 OBC |
296 | * This function registers a virtio device. This vdev's partent is |
297 | * the rproc device. | |
ac8954a4 | 298 | * |
7a186941 | 299 | * Returns 0 on success or an appropriate error value otherwise. |
ac8954a4 | 300 | */ |
7a186941 | 301 | int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id) |
ac8954a4 | 302 | { |
7a186941 | 303 | struct rproc *rproc = rvdev->rproc; |
b5ab5e24 | 304 | struct device *dev = &rproc->dev; |
7a186941 | 305 | struct virtio_device *vdev = &rvdev->vdev; |
ac8954a4 OBC |
306 | int ret; |
307 | ||
7a186941 OBC |
308 | vdev->id.device = id, |
309 | vdev->config = &rproc_virtio_config_ops, | |
310 | vdev->dev.parent = dev; | |
aab8d802 | 311 | vdev->dev.release = rproc_virtio_dev_release; |
ac8954a4 OBC |
312 | |
313 | /* | |
314 | * We're indirectly making a non-temporary copy of the rproc pointer | |
315 | * here, because drivers probed with this vdev will indirectly | |
316 | * access the wrapping rproc. | |
317 | * | |
318 | * Therefore we must increment the rproc refcount here, and decrement | |
319 | * it _only_ when the vdev is released. | |
320 | */ | |
7183a2a7 | 321 | get_device(&rproc->dev); |
ac8954a4 | 322 | |
aab8d802 BA |
323 | /* Reference the vdev and vring allocations */ |
324 | kref_get(&rvdev->refcount); | |
325 | ||
7a186941 | 326 | ret = register_virtio_device(vdev); |
ac8954a4 | 327 | if (ret) { |
7183a2a7 | 328 | put_device(&rproc->dev); |
ac8954a4 | 329 | dev_err(dev, "failed to register vdev: %d\n", ret); |
7a186941 | 330 | goto out; |
ac8954a4 OBC |
331 | } |
332 | ||
7a186941 OBC |
333 | dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id); |
334 | ||
335 | out: | |
ac8954a4 OBC |
336 | return ret; |
337 | } | |
338 | ||
339 | /** | |
7a186941 OBC |
340 | * rproc_remove_virtio_dev() - remove an rproc-induced virtio device |
341 | * @rvdev: the remote vdev | |
ac8954a4 | 342 | * |
7a186941 | 343 | * This function unregisters an existing virtio device. |
ac8954a4 | 344 | */ |
7a186941 | 345 | void rproc_remove_virtio_dev(struct rproc_vdev *rvdev) |
ac8954a4 | 346 | { |
ac8954a4 OBC |
347 | unregister_virtio_device(&rvdev->vdev); |
348 | } |