Commit | Line | Data |
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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ac8954a4 OBC |
2 | /* |
3 | * Remote processor messaging transport (OMAP platform-specific bits) | |
4 | * | |
5 | * Copyright (C) 2011 Texas Instruments, Inc. | |
6 | * Copyright (C) 2011 Google, Inc. | |
7 | * | |
8 | * Ohad Ben-Cohen <ohad@wizery.com> | |
9 | * Brian Swetland <swetland@google.com> | |
ac8954a4 OBC |
10 | */ |
11 | ||
9c31255c | 12 | #include <linux/dma-direct.h> |
0a0f0d8b | 13 | #include <linux/dma-map-ops.h> |
9c31255c | 14 | #include <linux/dma-mapping.h> |
ac8954a4 | 15 | #include <linux/export.h> |
086d0872 | 16 | #include <linux/of_reserved_mem.h> |
ccf22a48 | 17 | #include <linux/platform_device.h> |
ac8954a4 | 18 | #include <linux/remoteproc.h> |
ac8954a4 OBC |
19 | #include <linux/virtio.h> |
20 | #include <linux/virtio_config.h> | |
21 | #include <linux/virtio_ids.h> | |
22 | #include <linux/virtio_ring.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/kref.h> | |
25 | #include <linux/slab.h> | |
26 | ||
27 | #include "remoteproc_internal.h" | |
28 | ||
9c31255c AP |
29 | static int copy_dma_range_map(struct device *to, struct device *from) |
30 | { | |
31 | const struct bus_dma_region *map = from->dma_range_map, *new_map, *r; | |
32 | int num_ranges = 0; | |
33 | ||
34 | if (!map) | |
35 | return 0; | |
36 | ||
37 | for (r = map; r->size; r++) | |
38 | num_ranges++; | |
39 | ||
40 | new_map = kmemdup(map, array_size(num_ranges + 1, sizeof(*map)), | |
41 | GFP_KERNEL); | |
42 | if (!new_map) | |
43 | return -ENOMEM; | |
44 | to->dma_range_map = new_map; | |
45 | return 0; | |
46 | } | |
47 | ||
99555489 AP |
48 | static struct rproc_vdev *vdev_to_rvdev(struct virtio_device *vdev) |
49 | { | |
1d7b61c0 AP |
50 | struct platform_device *pdev; |
51 | ||
52 | pdev = container_of(vdev->dev.parent, struct platform_device, dev); | |
53 | ||
54 | return platform_get_drvdata(pdev); | |
99555489 AP |
55 | } |
56 | ||
57 | static struct rproc *vdev_to_rproc(struct virtio_device *vdev) | |
58 | { | |
59 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); | |
60 | ||
61 | return rvdev->rproc; | |
62 | } | |
63 | ||
ac8954a4 | 64 | /* kick the remote processor, and let it know which virtqueue to poke at */ |
46f9c2b9 | 65 | static bool rproc_virtio_notify(struct virtqueue *vq) |
ac8954a4 | 66 | { |
7a186941 OBC |
67 | struct rproc_vring *rvring = vq->priv; |
68 | struct rproc *rproc = rvring->rvdev->rproc; | |
69 | int notifyid = rvring->notifyid; | |
ac8954a4 | 70 | |
b5ab5e24 | 71 | dev_dbg(&rproc->dev, "kicking vq index: %d\n", notifyid); |
ac8954a4 | 72 | |
7a186941 | 73 | rproc->ops->kick(rproc, notifyid); |
46f9c2b9 | 74 | return true; |
ac8954a4 OBC |
75 | } |
76 | ||
77 | /** | |
78 | * rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted | |
79 | * @rproc: handle to the remote processor | |
7a186941 | 80 | * @notifyid: index of the signalled virtqueue (unique per this @rproc) |
ac8954a4 OBC |
81 | * |
82 | * This function should be called by the platform-specific rproc driver, | |
83 | * when the remote processor signals that a specific virtqueue has pending | |
84 | * messages available. | |
85 | * | |
f2867434 | 86 | * Return: IRQ_NONE if no message was found in the @notifyid virtqueue, |
ac8954a4 OBC |
87 | * and otherwise returns IRQ_HANDLED. |
88 | */ | |
7a186941 | 89 | irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid) |
ac8954a4 | 90 | { |
7a186941 OBC |
91 | struct rproc_vring *rvring; |
92 | ||
b5ab5e24 | 93 | dev_dbg(&rproc->dev, "vq index %d is interrupted\n", notifyid); |
7a186941 OBC |
94 | |
95 | rvring = idr_find(&rproc->notifyids, notifyid); | |
96 | if (!rvring || !rvring->vq) | |
97 | return IRQ_NONE; | |
98 | ||
99 | return vring_interrupt(0, rvring->vq); | |
ac8954a4 OBC |
100 | } |
101 | EXPORT_SYMBOL(rproc_vq_interrupt); | |
102 | ||
103 | static struct virtqueue *rp_find_vq(struct virtio_device *vdev, | |
f145928d | 104 | unsigned int id, |
ac8954a4 | 105 | void (*callback)(struct virtqueue *vq), |
f94682dd | 106 | const char *name, bool ctx) |
ac8954a4 | 107 | { |
7a186941 | 108 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
ac8954a4 | 109 | struct rproc *rproc = vdev_to_rproc(vdev); |
b5ab5e24 | 110 | struct device *dev = &rproc->dev; |
c6aed238 | 111 | struct rproc_mem_entry *mem; |
7a186941 | 112 | struct rproc_vring *rvring; |
c6aed238 | 113 | struct fw_rsc_vdev *rsc; |
ac8954a4 OBC |
114 | struct virtqueue *vq; |
115 | void *addr; | |
c2a052a4 | 116 | int num, size; |
ac8954a4 | 117 | |
7a186941 OBC |
118 | /* we're temporarily limited to two virtqueues per rvdev */ |
119 | if (id >= ARRAY_SIZE(rvdev->vring)) | |
120 | return ERR_PTR(-EINVAL); | |
121 | ||
6457f126 MT |
122 | if (!name) |
123 | return NULL; | |
124 | ||
c6aed238 LP |
125 | /* Search allocated memory region by name */ |
126 | mem = rproc_find_carveout_by_name(rproc, "vdev%dvring%d", rvdev->index, | |
127 | id); | |
128 | if (!mem || !mem->va) | |
129 | return ERR_PTR(-ENOMEM); | |
130 | ||
6db20ea8 | 131 | rvring = &rvdev->vring[id]; |
c6aed238 | 132 | addr = mem->va; |
c2a052a4 | 133 | num = rvring->num; |
ac8954a4 | 134 | |
7a186941 | 135 | /* zero vring */ |
c2a052a4 | 136 | size = vring_size(num, rvring->align); |
7a186941 | 137 | memset(addr, 0, size); |
ac8954a4 | 138 | |
276ec993 | 139 | dev_dbg(dev, "vring%d: va %pK qsz %d notifyid %d\n", |
c2a052a4 | 140 | id, addr, num, rvring->notifyid); |
ac8954a4 | 141 | |
dd6da1c5 OBC |
142 | /* |
143 | * Create the new vq, and tell virtio we're not interested in | |
144 | * the 'weak' smp barriers, since we're talking with a real device. | |
145 | */ | |
c2a052a4 | 146 | vq = vring_new_virtqueue(id, num, rvring->align, vdev, false, ctx, |
f94682dd | 147 | addr, rproc_virtio_notify, callback, name); |
ac8954a4 | 148 | if (!vq) { |
b5ab5e24 | 149 | dev_err(dev, "vring_new_virtqueue %s failed\n", name); |
6db20ea8 | 150 | rproc_free_vring(rvring); |
7a186941 | 151 | return ERR_PTR(-ENOMEM); |
ac8954a4 OBC |
152 | } |
153 | ||
da802961 XZ |
154 | vq->num_max = num; |
155 | ||
7a186941 OBC |
156 | rvring->vq = vq; |
157 | vq->priv = rvring; | |
ac8954a4 | 158 | |
c6aed238 LP |
159 | /* Update vring in resource table */ |
160 | rsc = (void *)rproc->table_ptr + rvdev->rsc_offset; | |
161 | rsc->vring[id].da = mem->da; | |
162 | ||
ac8954a4 | 163 | return vq; |
ac8954a4 OBC |
164 | } |
165 | ||
dab55bba | 166 | static void __rproc_virtio_del_vqs(struct virtio_device *vdev) |
ac8954a4 OBC |
167 | { |
168 | struct virtqueue *vq, *n; | |
7a186941 | 169 | struct rproc_vring *rvring; |
ac8954a4 OBC |
170 | |
171 | list_for_each_entry_safe(vq, n, &vdev->vqs, list) { | |
7a186941 OBC |
172 | rvring = vq->priv; |
173 | rvring->vq = NULL; | |
ac8954a4 | 174 | vring_del_virtqueue(vq); |
ac8954a4 | 175 | } |
ac8954a4 OBC |
176 | } |
177 | ||
dab55bba OBC |
178 | static void rproc_virtio_del_vqs(struct virtio_device *vdev) |
179 | { | |
dab55bba OBC |
180 | __rproc_virtio_del_vqs(vdev); |
181 | } | |
182 | ||
f145928d | 183 | static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs, |
730f84ce AS |
184 | struct virtqueue *vqs[], |
185 | vq_callback_t *callbacks[], | |
fb5e31d9 | 186 | const char * const names[], |
f94682dd | 187 | const bool * ctx, |
fb5e31d9 | 188 | struct irq_affinity *desc) |
ac8954a4 | 189 | { |
a229989d | 190 | int i, ret, queue_idx = 0; |
ac8954a4 | 191 | |
ac8954a4 | 192 | for (i = 0; i < nvqs; ++i) { |
a229989d WW |
193 | if (!names[i]) { |
194 | vqs[i] = NULL; | |
195 | continue; | |
196 | } | |
197 | ||
198 | vqs[i] = rp_find_vq(vdev, queue_idx++, callbacks[i], names[i], | |
f94682dd | 199 | ctx ? ctx[i] : false); |
ac8954a4 OBC |
200 | if (IS_ERR(vqs[i])) { |
201 | ret = PTR_ERR(vqs[i]); | |
202 | goto error; | |
203 | } | |
204 | } | |
205 | ||
206 | return 0; | |
207 | ||
208 | error: | |
dab55bba | 209 | __rproc_virtio_del_vqs(vdev); |
ac8954a4 OBC |
210 | return ret; |
211 | } | |
212 | ||
ac8954a4 OBC |
213 | static u8 rproc_virtio_get_status(struct virtio_device *vdev) |
214 | { | |
92b38f85 SB |
215 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
216 | struct fw_rsc_vdev *rsc; | |
217 | ||
218 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
219 | ||
220 | return rsc->status; | |
ac8954a4 OBC |
221 | } |
222 | ||
223 | static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status) | |
224 | { | |
92b38f85 SB |
225 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
226 | struct fw_rsc_vdev *rsc; | |
227 | ||
228 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
229 | ||
230 | rsc->status = status; | |
7a186941 | 231 | dev_dbg(&vdev->dev, "status: %d\n", status); |
ac8954a4 OBC |
232 | } |
233 | ||
234 | static void rproc_virtio_reset(struct virtio_device *vdev) | |
235 | { | |
92b38f85 SB |
236 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
237 | struct fw_rsc_vdev *rsc; | |
238 | ||
239 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
240 | ||
241 | rsc->status = 0; | |
ac8954a4 OBC |
242 | dev_dbg(&vdev->dev, "reset !\n"); |
243 | } | |
244 | ||
245 | /* provide the vdev features as retrieved from the firmware */ | |
d0254773 | 246 | static u64 rproc_virtio_get_features(struct virtio_device *vdev) |
ac8954a4 | 247 | { |
7a186941 | 248 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
92b38f85 SB |
249 | struct fw_rsc_vdev *rsc; |
250 | ||
251 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
ac8954a4 | 252 | |
92b38f85 | 253 | return rsc->dfeatures; |
ac8954a4 OBC |
254 | } |
255 | ||
3a814fdf TB |
256 | static void rproc_transport_features(struct virtio_device *vdev) |
257 | { | |
258 | /* | |
259 | * Packed ring isn't enabled on remoteproc for now, | |
260 | * because remoteproc uses vring_new_virtqueue() which | |
261 | * creates virtio rings on preallocated memory. | |
262 | */ | |
263 | __virtio_clear_bit(vdev, VIRTIO_F_RING_PACKED); | |
264 | } | |
265 | ||
5c609a5e | 266 | static int rproc_virtio_finalize_features(struct virtio_device *vdev) |
ac8954a4 | 267 | { |
7a186941 | 268 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
92b38f85 SB |
269 | struct fw_rsc_vdev *rsc; |
270 | ||
271 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
ac8954a4 OBC |
272 | |
273 | /* Give virtio_ring a chance to accept features */ | |
274 | vring_transport_features(vdev); | |
275 | ||
3a814fdf TB |
276 | /* Give virtio_rproc a chance to accept features. */ |
277 | rproc_transport_features(vdev); | |
278 | ||
93d389f8 MT |
279 | /* Make sure we don't have any features > 32 bits! */ |
280 | BUG_ON((u32)vdev->features != vdev->features); | |
281 | ||
ac8954a4 OBC |
282 | /* |
283 | * Remember the finalized features of our vdev, and provide it | |
284 | * to the remote processor once it is powered on. | |
ac8954a4 | 285 | */ |
e16e12be | 286 | rsc->gfeatures = vdev->features; |
5c609a5e MT |
287 | |
288 | return 0; | |
92b38f85 SB |
289 | } |
290 | ||
f145928d AS |
291 | static void rproc_virtio_get(struct virtio_device *vdev, unsigned int offset, |
292 | void *buf, unsigned int len) | |
92b38f85 SB |
293 | { |
294 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); | |
295 | struct fw_rsc_vdev *rsc; | |
296 | void *cfg; | |
297 | ||
298 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
299 | cfg = &rsc->vring[rsc->num_of_vrings]; | |
300 | ||
301 | if (offset + len > rsc->config_len || offset + len < len) { | |
302 | dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n"); | |
303 | return; | |
304 | } | |
305 | ||
306 | memcpy(buf, cfg + offset, len); | |
307 | } | |
308 | ||
f145928d AS |
309 | static void rproc_virtio_set(struct virtio_device *vdev, unsigned int offset, |
310 | const void *buf, unsigned int len) | |
92b38f85 SB |
311 | { |
312 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); | |
313 | struct fw_rsc_vdev *rsc; | |
314 | void *cfg; | |
315 | ||
316 | rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset; | |
317 | cfg = &rsc->vring[rsc->num_of_vrings]; | |
318 | ||
319 | if (offset + len > rsc->config_len || offset + len < len) { | |
320 | dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n"); | |
321 | return; | |
322 | } | |
323 | ||
324 | memcpy(cfg + offset, buf, len); | |
ac8954a4 OBC |
325 | } |
326 | ||
93503932 | 327 | static const struct virtio_config_ops rproc_virtio_config_ops = { |
ac8954a4 OBC |
328 | .get_features = rproc_virtio_get_features, |
329 | .finalize_features = rproc_virtio_finalize_features, | |
330 | .find_vqs = rproc_virtio_find_vqs, | |
331 | .del_vqs = rproc_virtio_del_vqs, | |
332 | .reset = rproc_virtio_reset, | |
333 | .set_status = rproc_virtio_set_status, | |
334 | .get_status = rproc_virtio_get_status, | |
92b38f85 SB |
335 | .get = rproc_virtio_get, |
336 | .set = rproc_virtio_set, | |
ac8954a4 OBC |
337 | }; |
338 | ||
339 | /* | |
340 | * This function is called whenever vdev is released, and is responsible | |
7183a2a7 | 341 | * to decrement the remote processor's refcount which was taken when vdev was |
ac8954a4 OBC |
342 | * added. |
343 | * | |
344 | * Never call this function directly; it will be called by the driver | |
345 | * core when needed. | |
346 | */ | |
aab8d802 | 347 | static void rproc_virtio_dev_release(struct device *dev) |
ac8954a4 OBC |
348 | { |
349 | struct virtio_device *vdev = dev_to_virtio(dev); | |
6db20ea8 | 350 | struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); |
ac8954a4 | 351 | |
d4c036fe LP |
352 | kfree(vdev); |
353 | ||
1d7b61c0 | 354 | put_device(&rvdev->pdev->dev); |
ac8954a4 OBC |
355 | } |
356 | ||
357 | /** | |
7a186941 OBC |
358 | * rproc_add_virtio_dev() - register an rproc-induced virtio device |
359 | * @rvdev: the remote vdev | |
2e7d4c2c | 360 | * @id: the device type identification (used to match it with a driver). |
ac8954a4 | 361 | * |
7a186941 OBC |
362 | * This function registers a virtio device. This vdev's partent is |
363 | * the rproc device. | |
ac8954a4 | 364 | * |
f2867434 | 365 | * Return: 0 on success or an appropriate error value otherwise |
ac8954a4 | 366 | */ |
9c31255c | 367 | static int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id) |
ac8954a4 | 368 | { |
7a186941 | 369 | struct rproc *rproc = rvdev->rproc; |
1d7b61c0 | 370 | struct device *dev = &rvdev->pdev->dev; |
d4c036fe | 371 | struct virtio_device *vdev; |
086d0872 | 372 | struct rproc_mem_entry *mem; |
ac8954a4 OBC |
373 | int ret; |
374 | ||
791c13b7 NS |
375 | if (rproc->ops->kick == NULL) { |
376 | ret = -EINVAL; | |
2fb75cea | 377 | dev_err(dev, ".kick method not defined for %s\n", rproc->name); |
791c13b7 NS |
378 | goto out; |
379 | } | |
380 | ||
086d0872 LP |
381 | /* Try to find dedicated vdev buffer carveout */ |
382 | mem = rproc_find_carveout_by_name(rproc, "vdev%dbuffer", rvdev->index); | |
383 | if (mem) { | |
384 | phys_addr_t pa; | |
385 | ||
386 | if (mem->of_resm_idx != -1) { | |
387 | struct device_node *np = rproc->dev.parent->of_node; | |
388 | ||
389 | /* Associate reserved memory to vdev device */ | |
390 | ret = of_reserved_mem_device_init_by_idx(dev, np, | |
391 | mem->of_resm_idx); | |
392 | if (ret) { | |
393 | dev_err(dev, "Can't associate reserved memory\n"); | |
394 | goto out; | |
395 | } | |
396 | } else { | |
397 | if (mem->va) { | |
398 | dev_warn(dev, "vdev %d buffer already mapped\n", | |
399 | rvdev->index); | |
400 | pa = rproc_va_to_pa(mem->va); | |
401 | } else { | |
402 | /* Use dma address as carveout no memmapped yet */ | |
403 | pa = (phys_addr_t)mem->dma; | |
404 | } | |
405 | ||
406 | /* Associate vdev buffer memory pool to vdev subdev */ | |
407 | ret = dma_declare_coherent_memory(dev, pa, | |
408 | mem->da, | |
d664ce75 | 409 | mem->len); |
086d0872 LP |
410 | if (ret < 0) { |
411 | dev_err(dev, "Failed to associate buffer\n"); | |
412 | goto out; | |
413 | } | |
414 | } | |
db9178a4 TK |
415 | } else { |
416 | struct device_node *np = rproc->dev.parent->of_node; | |
417 | ||
418 | /* | |
419 | * If we don't have dedicated buffer, just attempt to re-assign | |
420 | * the reserved memory from our parent. A default memory-region | |
421 | * at index 0 from the parent's memory-regions is assigned for | |
422 | * the rvdev dev to allocate from. Failure is non-critical and | |
423 | * the allocations will fall back to global pools, so don't | |
424 | * check return value either. | |
425 | */ | |
426 | of_reserved_mem_device_init_by_idx(dev, np, 0); | |
086d0872 LP |
427 | } |
428 | ||
d4c036fe LP |
429 | /* Allocate virtio device */ |
430 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
431 | if (!vdev) { | |
432 | ret = -ENOMEM; | |
433 | goto out; | |
434 | } | |
7a186941 OBC |
435 | vdev->id.device = id, |
436 | vdev->config = &rproc_virtio_config_ops, | |
437 | vdev->dev.parent = dev; | |
aab8d802 | 438 | vdev->dev.release = rproc_virtio_dev_release; |
ac8954a4 | 439 | |
aab8d802 | 440 | /* Reference the vdev and vring allocations */ |
1d7b61c0 | 441 | get_device(dev); |
aab8d802 | 442 | |
7a186941 | 443 | ret = register_virtio_device(vdev); |
ac8954a4 | 444 | if (ret) { |
900a163e | 445 | put_device(&vdev->dev); |
ac8954a4 | 446 | dev_err(dev, "failed to register vdev: %d\n", ret); |
7a186941 | 447 | goto out; |
ac8954a4 OBC |
448 | } |
449 | ||
7a186941 OBC |
450 | dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id); |
451 | ||
452 | out: | |
ac8954a4 OBC |
453 | return ret; |
454 | } | |
455 | ||
456 | /** | |
7a186941 | 457 | * rproc_remove_virtio_dev() - remove an rproc-induced virtio device |
d4c036fe LP |
458 | * @dev: the virtio device |
459 | * @data: must be null | |
ac8954a4 | 460 | * |
7a186941 | 461 | * This function unregisters an existing virtio device. |
f2867434 SA |
462 | * |
463 | * Return: 0 | |
ac8954a4 | 464 | */ |
9c31255c | 465 | static int rproc_remove_virtio_dev(struct device *dev, void *data) |
ac8954a4 | 466 | { |
d4c036fe LP |
467 | struct virtio_device *vdev = dev_to_virtio(dev); |
468 | ||
469 | unregister_virtio_device(vdev); | |
470 | return 0; | |
ac8954a4 | 471 | } |
9c31255c AP |
472 | |
473 | static int rproc_vdev_do_start(struct rproc_subdev *subdev) | |
474 | { | |
475 | struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev); | |
476 | ||
477 | return rproc_add_virtio_dev(rvdev, rvdev->id); | |
478 | } | |
479 | ||
480 | static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed) | |
481 | { | |
482 | struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev); | |
1d7b61c0 | 483 | struct device *dev = &rvdev->pdev->dev; |
9c31255c AP |
484 | int ret; |
485 | ||
1d7b61c0 | 486 | ret = device_for_each_child(dev, NULL, rproc_remove_virtio_dev); |
9c31255c | 487 | if (ret) |
1d7b61c0 | 488 | dev_warn(dev, "can't remove vdev child device: %d\n", ret); |
9c31255c AP |
489 | } |
490 | ||
1d7b61c0 | 491 | static int rproc_virtio_probe(struct platform_device *pdev) |
9c31255c | 492 | { |
1d7b61c0 AP |
493 | struct device *dev = &pdev->dev; |
494 | struct rproc_vdev_data *rvdev_data = dev->platform_data; | |
9c31255c | 495 | struct rproc_vdev *rvdev; |
1d7b61c0 AP |
496 | struct rproc *rproc = container_of(dev->parent, struct rproc, dev); |
497 | struct fw_rsc_vdev *rsc; | |
9c31255c AP |
498 | int i, ret; |
499 | ||
1d7b61c0 AP |
500 | if (!rvdev_data) |
501 | return -EINVAL; | |
9c31255c | 502 | |
1d7b61c0 AP |
503 | rvdev = devm_kzalloc(dev, sizeof(*rvdev), GFP_KERNEL); |
504 | if (!rvdev) | |
505 | return -ENOMEM; | |
9c31255c AP |
506 | |
507 | rvdev->id = rvdev_data->id; | |
508 | rvdev->rproc = rproc; | |
509 | rvdev->index = rvdev_data->index; | |
510 | ||
1d7b61c0 | 511 | ret = copy_dma_range_map(dev, rproc->dev.parent); |
9c31255c | 512 | if (ret) |
1d7b61c0 | 513 | return ret; |
9c31255c AP |
514 | |
515 | /* Make device dma capable by inheriting from parent's capabilities */ | |
1d7b61c0 | 516 | set_dma_ops(dev, get_dma_ops(rproc->dev.parent)); |
9c31255c | 517 | |
1d7b61c0 | 518 | ret = dma_coerce_mask_and_coherent(dev, dma_get_mask(rproc->dev.parent)); |
9c31255c | 519 | if (ret) { |
1d7b61c0 | 520 | dev_warn(dev, "Failed to set DMA mask %llx. Trying to continue... (%pe)\n", |
9c31255c AP |
521 | dma_get_mask(rproc->dev.parent), ERR_PTR(ret)); |
522 | } | |
523 | ||
1d7b61c0 AP |
524 | platform_set_drvdata(pdev, rvdev); |
525 | rvdev->pdev = pdev; | |
526 | ||
527 | rsc = rvdev_data->rsc; | |
528 | ||
9c31255c AP |
529 | /* parse the vrings */ |
530 | for (i = 0; i < rsc->num_of_vrings; i++) { | |
531 | ret = rproc_parse_vring(rvdev, rsc, i); | |
532 | if (ret) | |
1d7b61c0 | 533 | return ret; |
9c31255c AP |
534 | } |
535 | ||
536 | /* remember the resource offset*/ | |
537 | rvdev->rsc_offset = rvdev_data->rsc_offset; | |
538 | ||
539 | /* allocate the vring resources */ | |
540 | for (i = 0; i < rsc->num_of_vrings; i++) { | |
541 | ret = rproc_alloc_vring(rvdev, i); | |
542 | if (ret) | |
543 | goto unwind_vring_allocations; | |
544 | } | |
545 | ||
546 | rproc_add_rvdev(rproc, rvdev); | |
547 | ||
548 | rvdev->subdev.start = rproc_vdev_do_start; | |
549 | rvdev->subdev.stop = rproc_vdev_do_stop; | |
550 | ||
551 | rproc_add_subdev(rproc, &rvdev->subdev); | |
552 | ||
1d7b61c0 AP |
553 | /* |
554 | * We're indirectly making a non-temporary copy of the rproc pointer | |
555 | * here, because the platform device or the vdev device will indirectly | |
556 | * access the wrapping rproc. | |
557 | * | |
558 | * Therefore we must increment the rproc refcount here, and decrement | |
559 | * it _only_ on platform remove. | |
560 | */ | |
561 | get_device(&rproc->dev); | |
562 | ||
563 | return 0; | |
9c31255c AP |
564 | |
565 | unwind_vring_allocations: | |
566 | for (i--; i >= 0; i--) | |
567 | rproc_free_vring(&rvdev->vring[i]); | |
1d7b61c0 AP |
568 | |
569 | return ret; | |
9c31255c AP |
570 | } |
571 | ||
d1d8d442 | 572 | static void rproc_virtio_remove(struct platform_device *pdev) |
9c31255c | 573 | { |
1d7b61c0 | 574 | struct rproc_vdev *rvdev = dev_get_drvdata(&pdev->dev); |
9c31255c | 575 | struct rproc *rproc = rvdev->rproc; |
1d7b61c0 | 576 | struct rproc_vring *rvring; |
9c31255c AP |
577 | int id; |
578 | ||
579 | for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) { | |
580 | rvring = &rvdev->vring[id]; | |
581 | rproc_free_vring(rvring); | |
582 | } | |
583 | ||
584 | rproc_remove_subdev(rproc, &rvdev->subdev); | |
585 | rproc_remove_rvdev(rvdev); | |
1d7b61c0 AP |
586 | |
587 | of_reserved_mem_device_release(&pdev->dev); | |
588 | dma_release_coherent_memory(&pdev->dev); | |
589 | ||
590 | put_device(&rproc->dev); | |
9c31255c | 591 | } |
1d7b61c0 AP |
592 | |
593 | /* Platform driver */ | |
1d7b61c0 AP |
594 | static struct platform_driver rproc_virtio_driver = { |
595 | .probe = rproc_virtio_probe, | |
d1d8d442 | 596 | .remove_new = rproc_virtio_remove, |
1d7b61c0 AP |
597 | .driver = { |
598 | .name = "rproc-virtio", | |
1d7b61c0 AP |
599 | }, |
600 | }; | |
601 | builtin_platform_driver(rproc_virtio_driver); |