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1 | /* | |
2 | * Remote Processor Framework | |
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 | * Mark Grosen <mgrosen@ti.com> | |
10 | * Fernando Guzman Lugo <fernando.lugo@ti.com> | |
11 | * Suman Anna <s-anna@ti.com> | |
12 | * Robert Tivy <rtivy@ti.com> | |
13 | * Armando Uribe De Leon <x0095078@ti.com> | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * version 2 as published by the Free Software Foundation. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | */ | |
24 | ||
25 | #define pr_fmt(fmt) "%s: " fmt, __func__ | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/mutex.h> | |
32 | #include <linux/dma-mapping.h> | |
33 | #include <linux/firmware.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/debugfs.h> | |
36 | #include <linux/remoteproc.h> | |
37 | #include <linux/iommu.h> | |
38 | #include <linux/idr.h> | |
39 | #include <linux/elf.h> | |
40 | #include <linux/virtio_ids.h> | |
41 | #include <linux/virtio_ring.h> | |
42 | #include <asm/byteorder.h> | |
43 | ||
44 | #include "remoteproc_internal.h" | |
45 | ||
46 | typedef int (*rproc_handle_resources_t)(struct rproc *rproc, | |
47 | struct resource_table *table, int len); | |
48 | typedef int (*rproc_handle_resource_t)(struct rproc *rproc, void *, int avail); | |
49 | ||
50 | /* Unique indices for remoteproc devices */ | |
51 | static DEFINE_IDA(rproc_dev_index); | |
52 | ||
53 | static const char * const rproc_crash_names[] = { | |
54 | [RPROC_MMUFAULT] = "mmufault", | |
55 | }; | |
56 | ||
57 | /* translate rproc_crash_type to string */ | |
58 | static const char *rproc_crash_to_string(enum rproc_crash_type type) | |
59 | { | |
60 | if (type < ARRAY_SIZE(rproc_crash_names)) | |
61 | return rproc_crash_names[type]; | |
62 | return "unkown"; | |
63 | } | |
64 | ||
65 | /* | |
66 | * This is the IOMMU fault handler we register with the IOMMU API | |
67 | * (when relevant; not all remote processors access memory through | |
68 | * an IOMMU). | |
69 | * | |
70 | * IOMMU core will invoke this handler whenever the remote processor | |
71 | * will try to access an unmapped device address. | |
72 | */ | |
73 | static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
74 | unsigned long iova, int flags, void *token) | |
75 | { | |
76 | struct rproc *rproc = token; | |
77 | ||
78 | dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags); | |
79 | ||
80 | rproc_report_crash(rproc, RPROC_MMUFAULT); | |
81 | ||
82 | /* | |
83 | * Let the iommu core know we're not really handling this fault; | |
84 | * we just used it as a recovery trigger. | |
85 | */ | |
86 | return -ENOSYS; | |
87 | } | |
88 | ||
89 | static int rproc_enable_iommu(struct rproc *rproc) | |
90 | { | |
91 | struct iommu_domain *domain; | |
92 | struct device *dev = rproc->dev.parent; | |
93 | int ret; | |
94 | ||
95 | /* | |
96 | * We currently use iommu_present() to decide if an IOMMU | |
97 | * setup is needed. | |
98 | * | |
99 | * This works for simple cases, but will easily fail with | |
100 | * platforms that do have an IOMMU, but not for this specific | |
101 | * rproc. | |
102 | * | |
103 | * This will be easily solved by introducing hw capabilities | |
104 | * that will be set by the remoteproc driver. | |
105 | */ | |
106 | if (!iommu_present(dev->bus)) { | |
107 | dev_dbg(dev, "iommu not found\n"); | |
108 | return 0; | |
109 | } | |
110 | ||
111 | domain = iommu_domain_alloc(dev->bus); | |
112 | if (!domain) { | |
113 | dev_err(dev, "can't alloc iommu domain\n"); | |
114 | return -ENOMEM; | |
115 | } | |
116 | ||
117 | iommu_set_fault_handler(domain, rproc_iommu_fault, rproc); | |
118 | ||
119 | ret = iommu_attach_device(domain, dev); | |
120 | if (ret) { | |
121 | dev_err(dev, "can't attach iommu device: %d\n", ret); | |
122 | goto free_domain; | |
123 | } | |
124 | ||
125 | rproc->domain = domain; | |
126 | ||
127 | return 0; | |
128 | ||
129 | free_domain: | |
130 | iommu_domain_free(domain); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static void rproc_disable_iommu(struct rproc *rproc) | |
135 | { | |
136 | struct iommu_domain *domain = rproc->domain; | |
137 | struct device *dev = rproc->dev.parent; | |
138 | ||
139 | if (!domain) | |
140 | return; | |
141 | ||
142 | iommu_detach_device(domain, dev); | |
143 | iommu_domain_free(domain); | |
144 | ||
145 | return; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Some remote processors will ask us to allocate them physically contiguous | |
150 | * memory regions (which we call "carveouts"), and map them to specific | |
151 | * device addresses (which are hardcoded in the firmware). | |
152 | * | |
153 | * They may then ask us to copy objects into specific device addresses (e.g. | |
154 | * code/data sections) or expose us certain symbols in other device address | |
155 | * (e.g. their trace buffer). | |
156 | * | |
157 | * This function is an internal helper with which we can go over the allocated | |
158 | * carveouts and translate specific device address to kernel virtual addresses | |
159 | * so we can access the referenced memory. | |
160 | * | |
161 | * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too, | |
162 | * but only on kernel direct mapped RAM memory. Instead, we're just using | |
163 | * here the output of the DMA API, which should be more correct. | |
164 | */ | |
165 | void *rproc_da_to_va(struct rproc *rproc, u64 da, int len) | |
166 | { | |
167 | struct rproc_mem_entry *carveout; | |
168 | void *ptr = NULL; | |
169 | ||
170 | list_for_each_entry(carveout, &rproc->carveouts, node) { | |
171 | int offset = da - carveout->da; | |
172 | ||
173 | /* try next carveout if da is too small */ | |
174 | if (offset < 0) | |
175 | continue; | |
176 | ||
177 | /* try next carveout if da is too large */ | |
178 | if (offset + len > carveout->len) | |
179 | continue; | |
180 | ||
181 | ptr = carveout->va + offset; | |
182 | ||
183 | break; | |
184 | } | |
185 | ||
186 | return ptr; | |
187 | } | |
188 | EXPORT_SYMBOL(rproc_da_to_va); | |
189 | ||
190 | int rproc_alloc_vring(struct rproc_vdev *rvdev, int i) | |
191 | { | |
192 | struct rproc *rproc = rvdev->rproc; | |
193 | struct device *dev = &rproc->dev; | |
194 | struct rproc_vring *rvring = &rvdev->vring[i]; | |
195 | dma_addr_t dma; | |
196 | void *va; | |
197 | int ret, size, notifyid; | |
198 | ||
199 | /* actual size of vring (in bytes) */ | |
200 | size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); | |
201 | ||
202 | /* | |
203 | * Allocate non-cacheable memory for the vring. In the future | |
204 | * this call will also configure the IOMMU for us | |
205 | * TODO: let the rproc know the da of this vring | |
206 | */ | |
207 | va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL); | |
208 | if (!va) { | |
209 | dev_err(dev->parent, "dma_alloc_coherent failed\n"); | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Assign an rproc-wide unique index for this vring | |
215 | * TODO: assign a notifyid for rvdev updates as well | |
216 | * TODO: let the rproc know the notifyid of this vring | |
217 | * TODO: support predefined notifyids (via resource table) | |
218 | */ | |
219 | ret = idr_alloc(&rproc->notifyids, rvring, 0, 0, GFP_KERNEL); | |
220 | if (ret < 0) { | |
221 | dev_err(dev, "idr_alloc failed: %d\n", ret); | |
222 | dma_free_coherent(dev->parent, size, va, dma); | |
223 | return ret; | |
224 | } | |
225 | notifyid = ret; | |
226 | ||
227 | /* Store largest notifyid */ | |
228 | rproc->max_notifyid = max(rproc->max_notifyid, notifyid); | |
229 | ||
230 | dev_dbg(dev, "vring%d: va %p dma %llx size %x idr %d\n", i, va, | |
231 | (unsigned long long)dma, size, notifyid); | |
232 | ||
233 | rvring->va = va; | |
234 | rvring->dma = dma; | |
235 | rvring->notifyid = notifyid; | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static int | |
241 | rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i) | |
242 | { | |
243 | struct rproc *rproc = rvdev->rproc; | |
244 | struct device *dev = &rproc->dev; | |
245 | struct fw_rsc_vdev_vring *vring = &rsc->vring[i]; | |
246 | struct rproc_vring *rvring = &rvdev->vring[i]; | |
247 | ||
248 | dev_dbg(dev, "vdev rsc: vring%d: da %x, qsz %d, align %d\n", | |
249 | i, vring->da, vring->num, vring->align); | |
250 | ||
251 | /* make sure reserved bytes are zeroes */ | |
252 | if (vring->reserved) { | |
253 | dev_err(dev, "vring rsc has non zero reserved bytes\n"); | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
257 | /* verify queue size and vring alignment are sane */ | |
258 | if (!vring->num || !vring->align) { | |
259 | dev_err(dev, "invalid qsz (%d) or alignment (%d)\n", | |
260 | vring->num, vring->align); | |
261 | return -EINVAL; | |
262 | } | |
263 | ||
264 | rvring->len = vring->num; | |
265 | rvring->align = vring->align; | |
266 | rvring->rvdev = rvdev; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | static int rproc_max_notifyid(int id, void *p, void *data) | |
272 | { | |
273 | int *maxid = data; | |
274 | *maxid = max(*maxid, id); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | void rproc_free_vring(struct rproc_vring *rvring) | |
279 | { | |
280 | int size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); | |
281 | struct rproc *rproc = rvring->rvdev->rproc; | |
282 | int maxid = 0; | |
283 | ||
284 | dma_free_coherent(rproc->dev.parent, size, rvring->va, rvring->dma); | |
285 | idr_remove(&rproc->notifyids, rvring->notifyid); | |
286 | ||
287 | /* Find the largest remaining notifyid */ | |
288 | idr_for_each(&rproc->notifyids, rproc_max_notifyid, &maxid); | |
289 | rproc->max_notifyid = maxid; | |
290 | } | |
291 | ||
292 | /** | |
293 | * rproc_handle_vdev() - handle a vdev fw resource | |
294 | * @rproc: the remote processor | |
295 | * @rsc: the vring resource descriptor | |
296 | * @avail: size of available data (for sanity checking the image) | |
297 | * | |
298 | * This resource entry requests the host to statically register a virtio | |
299 | * device (vdev), and setup everything needed to support it. It contains | |
300 | * everything needed to make it possible: the virtio device id, virtio | |
301 | * device features, vrings information, virtio config space, etc... | |
302 | * | |
303 | * Before registering the vdev, the vrings are allocated from non-cacheable | |
304 | * physically contiguous memory. Currently we only support two vrings per | |
305 | * remote processor (temporary limitation). We might also want to consider | |
306 | * doing the vring allocation only later when ->find_vqs() is invoked, and | |
307 | * then release them upon ->del_vqs(). | |
308 | * | |
309 | * Note: @da is currently not really handled correctly: we dynamically | |
310 | * allocate it using the DMA API, ignoring requested hard coded addresses, | |
311 | * and we don't take care of any required IOMMU programming. This is all | |
312 | * going to be taken care of when the generic iommu-based DMA API will be | |
313 | * merged. Meanwhile, statically-addressed iommu-based firmware images should | |
314 | * use RSC_DEVMEM resource entries to map their required @da to the physical | |
315 | * address of their base CMA region (ouch, hacky!). | |
316 | * | |
317 | * Returns 0 on success, or an appropriate error code otherwise | |
318 | */ | |
319 | static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, | |
320 | int avail) | |
321 | { | |
322 | struct device *dev = &rproc->dev; | |
323 | struct rproc_vdev *rvdev; | |
324 | int i, ret; | |
325 | ||
326 | /* make sure resource isn't truncated */ | |
327 | if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring) | |
328 | + rsc->config_len > avail) { | |
329 | dev_err(dev, "vdev rsc is truncated\n"); | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | /* make sure reserved bytes are zeroes */ | |
334 | if (rsc->reserved[0] || rsc->reserved[1]) { | |
335 | dev_err(dev, "vdev rsc has non zero reserved bytes\n"); | |
336 | return -EINVAL; | |
337 | } | |
338 | ||
339 | dev_dbg(dev, "vdev rsc: id %d, dfeatures %x, cfg len %d, %d vrings\n", | |
340 | rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings); | |
341 | ||
342 | /* we currently support only two vrings per rvdev */ | |
343 | if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) { | |
344 | dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings); | |
345 | return -EINVAL; | |
346 | } | |
347 | ||
348 | rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL); | |
349 | if (!rvdev) | |
350 | return -ENOMEM; | |
351 | ||
352 | rvdev->rproc = rproc; | |
353 | ||
354 | /* parse the vrings */ | |
355 | for (i = 0; i < rsc->num_of_vrings; i++) { | |
356 | ret = rproc_parse_vring(rvdev, rsc, i); | |
357 | if (ret) | |
358 | goto free_rvdev; | |
359 | } | |
360 | ||
361 | /* remember the device features */ | |
362 | rvdev->dfeatures = rsc->dfeatures; | |
363 | ||
364 | list_add_tail(&rvdev->node, &rproc->rvdevs); | |
365 | ||
366 | /* it is now safe to add the virtio device */ | |
367 | ret = rproc_add_virtio_dev(rvdev, rsc->id); | |
368 | if (ret) | |
369 | goto remove_rvdev; | |
370 | ||
371 | return 0; | |
372 | ||
373 | remove_rvdev: | |
374 | list_del(&rvdev->node); | |
375 | free_rvdev: | |
376 | kfree(rvdev); | |
377 | return ret; | |
378 | } | |
379 | ||
380 | /** | |
381 | * rproc_handle_trace() - handle a shared trace buffer resource | |
382 | * @rproc: the remote processor | |
383 | * @rsc: the trace resource descriptor | |
384 | * @avail: size of available data (for sanity checking the image) | |
385 | * | |
386 | * In case the remote processor dumps trace logs into memory, | |
387 | * export it via debugfs. | |
388 | * | |
389 | * Currently, the 'da' member of @rsc should contain the device address | |
390 | * where the remote processor is dumping the traces. Later we could also | |
391 | * support dynamically allocating this address using the generic | |
392 | * DMA API (but currently there isn't a use case for that). | |
393 | * | |
394 | * Returns 0 on success, or an appropriate error code otherwise | |
395 | */ | |
396 | static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc, | |
397 | int avail) | |
398 | { | |
399 | struct rproc_mem_entry *trace; | |
400 | struct device *dev = &rproc->dev; | |
401 | void *ptr; | |
402 | char name[15]; | |
403 | ||
404 | if (sizeof(*rsc) > avail) { | |
405 | dev_err(dev, "trace rsc is truncated\n"); | |
406 | return -EINVAL; | |
407 | } | |
408 | ||
409 | /* make sure reserved bytes are zeroes */ | |
410 | if (rsc->reserved) { | |
411 | dev_err(dev, "trace rsc has non zero reserved bytes\n"); | |
412 | return -EINVAL; | |
413 | } | |
414 | ||
415 | /* what's the kernel address of this resource ? */ | |
416 | ptr = rproc_da_to_va(rproc, rsc->da, rsc->len); | |
417 | if (!ptr) { | |
418 | dev_err(dev, "erroneous trace resource entry\n"); | |
419 | return -EINVAL; | |
420 | } | |
421 | ||
422 | trace = kzalloc(sizeof(*trace), GFP_KERNEL); | |
423 | if (!trace) { | |
424 | dev_err(dev, "kzalloc trace failed\n"); | |
425 | return -ENOMEM; | |
426 | } | |
427 | ||
428 | /* set the trace buffer dma properties */ | |
429 | trace->len = rsc->len; | |
430 | trace->va = ptr; | |
431 | ||
432 | /* make sure snprintf always null terminates, even if truncating */ | |
433 | snprintf(name, sizeof(name), "trace%d", rproc->num_traces); | |
434 | ||
435 | /* create the debugfs entry */ | |
436 | trace->priv = rproc_create_trace_file(name, rproc, trace); | |
437 | if (!trace->priv) { | |
438 | trace->va = NULL; | |
439 | kfree(trace); | |
440 | return -EINVAL; | |
441 | } | |
442 | ||
443 | list_add_tail(&trace->node, &rproc->traces); | |
444 | ||
445 | rproc->num_traces++; | |
446 | ||
447 | dev_dbg(dev, "%s added: va %p, da 0x%x, len 0x%x\n", name, ptr, | |
448 | rsc->da, rsc->len); | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | /** | |
454 | * rproc_handle_devmem() - handle devmem resource entry | |
455 | * @rproc: remote processor handle | |
456 | * @rsc: the devmem resource entry | |
457 | * @avail: size of available data (for sanity checking the image) | |
458 | * | |
459 | * Remote processors commonly need to access certain on-chip peripherals. | |
460 | * | |
461 | * Some of these remote processors access memory via an iommu device, | |
462 | * and might require us to configure their iommu before they can access | |
463 | * the on-chip peripherals they need. | |
464 | * | |
465 | * This resource entry is a request to map such a peripheral device. | |
466 | * | |
467 | * These devmem entries will contain the physical address of the device in | |
468 | * the 'pa' member. If a specific device address is expected, then 'da' will | |
469 | * contain it (currently this is the only use case supported). 'len' will | |
470 | * contain the size of the physical region we need to map. | |
471 | * | |
472 | * Currently we just "trust" those devmem entries to contain valid physical | |
473 | * addresses, but this is going to change: we want the implementations to | |
474 | * tell us ranges of physical addresses the firmware is allowed to request, | |
475 | * and not allow firmwares to request access to physical addresses that | |
476 | * are outside those ranges. | |
477 | */ | |
478 | static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc, | |
479 | int avail) | |
480 | { | |
481 | struct rproc_mem_entry *mapping; | |
482 | struct device *dev = &rproc->dev; | |
483 | int ret; | |
484 | ||
485 | /* no point in handling this resource without a valid iommu domain */ | |
486 | if (!rproc->domain) | |
487 | return -EINVAL; | |
488 | ||
489 | if (sizeof(*rsc) > avail) { | |
490 | dev_err(dev, "devmem rsc is truncated\n"); | |
491 | return -EINVAL; | |
492 | } | |
493 | ||
494 | /* make sure reserved bytes are zeroes */ | |
495 | if (rsc->reserved) { | |
496 | dev_err(dev, "devmem rsc has non zero reserved bytes\n"); | |
497 | return -EINVAL; | |
498 | } | |
499 | ||
500 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); | |
501 | if (!mapping) { | |
502 | dev_err(dev, "kzalloc mapping failed\n"); | |
503 | return -ENOMEM; | |
504 | } | |
505 | ||
506 | ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags); | |
507 | if (ret) { | |
508 | dev_err(dev, "failed to map devmem: %d\n", ret); | |
509 | goto out; | |
510 | } | |
511 | ||
512 | /* | |
513 | * We'll need this info later when we'll want to unmap everything | |
514 | * (e.g. on shutdown). | |
515 | * | |
516 | * We can't trust the remote processor not to change the resource | |
517 | * table, so we must maintain this info independently. | |
518 | */ | |
519 | mapping->da = rsc->da; | |
520 | mapping->len = rsc->len; | |
521 | list_add_tail(&mapping->node, &rproc->mappings); | |
522 | ||
523 | dev_dbg(dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n", | |
524 | rsc->pa, rsc->da, rsc->len); | |
525 | ||
526 | return 0; | |
527 | ||
528 | out: | |
529 | kfree(mapping); | |
530 | return ret; | |
531 | } | |
532 | ||
533 | /** | |
534 | * rproc_handle_carveout() - handle phys contig memory allocation requests | |
535 | * @rproc: rproc handle | |
536 | * @rsc: the resource entry | |
537 | * @avail: size of available data (for image validation) | |
538 | * | |
539 | * This function will handle firmware requests for allocation of physically | |
540 | * contiguous memory regions. | |
541 | * | |
542 | * These request entries should come first in the firmware's resource table, | |
543 | * as other firmware entries might request placing other data objects inside | |
544 | * these memory regions (e.g. data/code segments, trace resource entries, ...). | |
545 | * | |
546 | * Allocating memory this way helps utilizing the reserved physical memory | |
547 | * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries | |
548 | * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB | |
549 | * pressure is important; it may have a substantial impact on performance. | |
550 | */ | |
551 | static int rproc_handle_carveout(struct rproc *rproc, | |
552 | struct fw_rsc_carveout *rsc, int avail) | |
553 | { | |
554 | struct rproc_mem_entry *carveout, *mapping; | |
555 | struct device *dev = &rproc->dev; | |
556 | dma_addr_t dma; | |
557 | void *va; | |
558 | int ret; | |
559 | ||
560 | if (sizeof(*rsc) > avail) { | |
561 | dev_err(dev, "carveout rsc is truncated\n"); | |
562 | return -EINVAL; | |
563 | } | |
564 | ||
565 | /* make sure reserved bytes are zeroes */ | |
566 | if (rsc->reserved) { | |
567 | dev_err(dev, "carveout rsc has non zero reserved bytes\n"); | |
568 | return -EINVAL; | |
569 | } | |
570 | ||
571 | dev_dbg(dev, "carveout rsc: da %x, pa %x, len %x, flags %x\n", | |
572 | rsc->da, rsc->pa, rsc->len, rsc->flags); | |
573 | ||
574 | carveout = kzalloc(sizeof(*carveout), GFP_KERNEL); | |
575 | if (!carveout) { | |
576 | dev_err(dev, "kzalloc carveout failed\n"); | |
577 | return -ENOMEM; | |
578 | } | |
579 | ||
580 | va = dma_alloc_coherent(dev->parent, rsc->len, &dma, GFP_KERNEL); | |
581 | if (!va) { | |
582 | dev_err(dev->parent, "dma_alloc_coherent err: %d\n", rsc->len); | |
583 | ret = -ENOMEM; | |
584 | goto free_carv; | |
585 | } | |
586 | ||
587 | dev_dbg(dev, "carveout va %p, dma %llx, len 0x%x\n", va, | |
588 | (unsigned long long)dma, rsc->len); | |
589 | ||
590 | /* | |
591 | * Ok, this is non-standard. | |
592 | * | |
593 | * Sometimes we can't rely on the generic iommu-based DMA API | |
594 | * to dynamically allocate the device address and then set the IOMMU | |
595 | * tables accordingly, because some remote processors might | |
596 | * _require_ us to use hard coded device addresses that their | |
597 | * firmware was compiled with. | |
598 | * | |
599 | * In this case, we must use the IOMMU API directly and map | |
600 | * the memory to the device address as expected by the remote | |
601 | * processor. | |
602 | * | |
603 | * Obviously such remote processor devices should not be configured | |
604 | * to use the iommu-based DMA API: we expect 'dma' to contain the | |
605 | * physical address in this case. | |
606 | */ | |
607 | if (rproc->domain) { | |
608 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); | |
609 | if (!mapping) { | |
610 | dev_err(dev, "kzalloc mapping failed\n"); | |
611 | ret = -ENOMEM; | |
612 | goto dma_free; | |
613 | } | |
614 | ||
615 | ret = iommu_map(rproc->domain, rsc->da, dma, rsc->len, | |
616 | rsc->flags); | |
617 | if (ret) { | |
618 | dev_err(dev, "iommu_map failed: %d\n", ret); | |
619 | goto free_mapping; | |
620 | } | |
621 | ||
622 | /* | |
623 | * We'll need this info later when we'll want to unmap | |
624 | * everything (e.g. on shutdown). | |
625 | * | |
626 | * We can't trust the remote processor not to change the | |
627 | * resource table, so we must maintain this info independently. | |
628 | */ | |
629 | mapping->da = rsc->da; | |
630 | mapping->len = rsc->len; | |
631 | list_add_tail(&mapping->node, &rproc->mappings); | |
632 | ||
633 | dev_dbg(dev, "carveout mapped 0x%x to 0x%llx\n", | |
634 | rsc->da, (unsigned long long)dma); | |
635 | } | |
636 | ||
637 | /* | |
638 | * Some remote processors might need to know the pa | |
639 | * even though they are behind an IOMMU. E.g., OMAP4's | |
640 | * remote M3 processor needs this so it can control | |
641 | * on-chip hardware accelerators that are not behind | |
642 | * the IOMMU, and therefor must know the pa. | |
643 | * | |
644 | * Generally we don't want to expose physical addresses | |
645 | * if we don't have to (remote processors are generally | |
646 | * _not_ trusted), so we might want to do this only for | |
647 | * remote processor that _must_ have this (e.g. OMAP4's | |
648 | * dual M3 subsystem). | |
649 | * | |
650 | * Non-IOMMU processors might also want to have this info. | |
651 | * In this case, the device address and the physical address | |
652 | * are the same. | |
653 | */ | |
654 | rsc->pa = dma; | |
655 | ||
656 | carveout->va = va; | |
657 | carveout->len = rsc->len; | |
658 | carveout->dma = dma; | |
659 | carveout->da = rsc->da; | |
660 | ||
661 | list_add_tail(&carveout->node, &rproc->carveouts); | |
662 | ||
663 | return 0; | |
664 | ||
665 | free_mapping: | |
666 | kfree(mapping); | |
667 | dma_free: | |
668 | dma_free_coherent(dev->parent, rsc->len, va, dma); | |
669 | free_carv: | |
670 | kfree(carveout); | |
671 | return ret; | |
672 | } | |
673 | ||
674 | /* | |
675 | * A lookup table for resource handlers. The indices are defined in | |
676 | * enum fw_resource_type. | |
677 | */ | |
678 | static rproc_handle_resource_t rproc_handle_rsc[] = { | |
679 | [RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout, | |
680 | [RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem, | |
681 | [RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace, | |
682 | [RSC_VDEV] = NULL, /* VDEVs were handled upon registrarion */ | |
683 | }; | |
684 | ||
685 | /* handle firmware resource entries before booting the remote processor */ | |
686 | static int | |
687 | rproc_handle_boot_rsc(struct rproc *rproc, struct resource_table *table, int len) | |
688 | { | |
689 | struct device *dev = &rproc->dev; | |
690 | rproc_handle_resource_t handler; | |
691 | int ret = 0, i; | |
692 | ||
693 | for (i = 0; i < table->num; i++) { | |
694 | int offset = table->offset[i]; | |
695 | struct fw_rsc_hdr *hdr = (void *)table + offset; | |
696 | int avail = len - offset - sizeof(*hdr); | |
697 | void *rsc = (void *)hdr + sizeof(*hdr); | |
698 | ||
699 | /* make sure table isn't truncated */ | |
700 | if (avail < 0) { | |
701 | dev_err(dev, "rsc table is truncated\n"); | |
702 | return -EINVAL; | |
703 | } | |
704 | ||
705 | dev_dbg(dev, "rsc: type %d\n", hdr->type); | |
706 | ||
707 | if (hdr->type >= RSC_LAST) { | |
708 | dev_warn(dev, "unsupported resource %d\n", hdr->type); | |
709 | continue; | |
710 | } | |
711 | ||
712 | handler = rproc_handle_rsc[hdr->type]; | |
713 | if (!handler) | |
714 | continue; | |
715 | ||
716 | ret = handler(rproc, rsc, avail); | |
717 | if (ret) | |
718 | break; | |
719 | } | |
720 | ||
721 | return ret; | |
722 | } | |
723 | ||
724 | /* handle firmware resource entries while registering the remote processor */ | |
725 | static int | |
726 | rproc_handle_virtio_rsc(struct rproc *rproc, struct resource_table *table, int len) | |
727 | { | |
728 | struct device *dev = &rproc->dev; | |
729 | int ret = 0, i; | |
730 | ||
731 | for (i = 0; i < table->num; i++) { | |
732 | int offset = table->offset[i]; | |
733 | struct fw_rsc_hdr *hdr = (void *)table + offset; | |
734 | int avail = len - offset - sizeof(*hdr); | |
735 | struct fw_rsc_vdev *vrsc; | |
736 | ||
737 | /* make sure table isn't truncated */ | |
738 | if (avail < 0) { | |
739 | dev_err(dev, "rsc table is truncated\n"); | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
743 | dev_dbg(dev, "%s: rsc type %d\n", __func__, hdr->type); | |
744 | ||
745 | if (hdr->type != RSC_VDEV) | |
746 | continue; | |
747 | ||
748 | vrsc = (struct fw_rsc_vdev *)hdr->data; | |
749 | ||
750 | ret = rproc_handle_vdev(rproc, vrsc, avail); | |
751 | if (ret) | |
752 | break; | |
753 | } | |
754 | ||
755 | return ret; | |
756 | } | |
757 | ||
758 | /** | |
759 | * rproc_resource_cleanup() - clean up and free all acquired resources | |
760 | * @rproc: rproc handle | |
761 | * | |
762 | * This function will free all resources acquired for @rproc, and it | |
763 | * is called whenever @rproc either shuts down or fails to boot. | |
764 | */ | |
765 | static void rproc_resource_cleanup(struct rproc *rproc) | |
766 | { | |
767 | struct rproc_mem_entry *entry, *tmp; | |
768 | struct device *dev = &rproc->dev; | |
769 | ||
770 | /* clean up debugfs trace entries */ | |
771 | list_for_each_entry_safe(entry, tmp, &rproc->traces, node) { | |
772 | rproc_remove_trace_file(entry->priv); | |
773 | rproc->num_traces--; | |
774 | list_del(&entry->node); | |
775 | kfree(entry); | |
776 | } | |
777 | ||
778 | /* clean up carveout allocations */ | |
779 | list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) { | |
780 | dma_free_coherent(dev->parent, entry->len, entry->va, entry->dma); | |
781 | list_del(&entry->node); | |
782 | kfree(entry); | |
783 | } | |
784 | ||
785 | /* clean up iommu mapping entries */ | |
786 | list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) { | |
787 | size_t unmapped; | |
788 | ||
789 | unmapped = iommu_unmap(rproc->domain, entry->da, entry->len); | |
790 | if (unmapped != entry->len) { | |
791 | /* nothing much to do besides complaining */ | |
792 | dev_err(dev, "failed to unmap %u/%zu\n", entry->len, | |
793 | unmapped); | |
794 | } | |
795 | ||
796 | list_del(&entry->node); | |
797 | kfree(entry); | |
798 | } | |
799 | } | |
800 | ||
801 | /* | |
802 | * take a firmware and boot a remote processor with it. | |
803 | */ | |
804 | static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) | |
805 | { | |
806 | struct device *dev = &rproc->dev; | |
807 | const char *name = rproc->firmware; | |
808 | struct resource_table *table; | |
809 | int ret, tablesz; | |
810 | ||
811 | ret = rproc_fw_sanity_check(rproc, fw); | |
812 | if (ret) | |
813 | return ret; | |
814 | ||
815 | dev_info(dev, "Booting fw image %s, size %zd\n", name, fw->size); | |
816 | ||
817 | /* | |
818 | * if enabling an IOMMU isn't relevant for this rproc, this is | |
819 | * just a nop | |
820 | */ | |
821 | ret = rproc_enable_iommu(rproc); | |
822 | if (ret) { | |
823 | dev_err(dev, "can't enable iommu: %d\n", ret); | |
824 | return ret; | |
825 | } | |
826 | ||
827 | rproc->bootaddr = rproc_get_boot_addr(rproc, fw); | |
828 | ||
829 | /* look for the resource table */ | |
830 | table = rproc_find_rsc_table(rproc, fw, &tablesz); | |
831 | if (!table) { | |
832 | ret = -EINVAL; | |
833 | goto clean_up; | |
834 | } | |
835 | ||
836 | /* handle fw resources which are required to boot rproc */ | |
837 | ret = rproc_handle_boot_rsc(rproc, table, tablesz); | |
838 | if (ret) { | |
839 | dev_err(dev, "Failed to process resources: %d\n", ret); | |
840 | goto clean_up; | |
841 | } | |
842 | ||
843 | /* load the ELF segments to memory */ | |
844 | ret = rproc_load_segments(rproc, fw); | |
845 | if (ret) { | |
846 | dev_err(dev, "Failed to load program segments: %d\n", ret); | |
847 | goto clean_up; | |
848 | } | |
849 | ||
850 | /* power up the remote processor */ | |
851 | ret = rproc->ops->start(rproc); | |
852 | if (ret) { | |
853 | dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret); | |
854 | goto clean_up; | |
855 | } | |
856 | ||
857 | rproc->state = RPROC_RUNNING; | |
858 | ||
859 | dev_info(dev, "remote processor %s is now up\n", rproc->name); | |
860 | ||
861 | return 0; | |
862 | ||
863 | clean_up: | |
864 | rproc_resource_cleanup(rproc); | |
865 | rproc_disable_iommu(rproc); | |
866 | return ret; | |
867 | } | |
868 | ||
869 | /* | |
870 | * take a firmware and look for virtio devices to register. | |
871 | * | |
872 | * Note: this function is called asynchronously upon registration of the | |
873 | * remote processor (so we must wait until it completes before we try | |
874 | * to unregister the device. one other option is just to use kref here, | |
875 | * that might be cleaner). | |
876 | */ | |
877 | static void rproc_fw_config_virtio(const struct firmware *fw, void *context) | |
878 | { | |
879 | struct rproc *rproc = context; | |
880 | struct resource_table *table; | |
881 | int ret, tablesz; | |
882 | ||
883 | if (rproc_fw_sanity_check(rproc, fw) < 0) | |
884 | goto out; | |
885 | ||
886 | /* look for the resource table */ | |
887 | table = rproc_find_rsc_table(rproc, fw, &tablesz); | |
888 | if (!table) | |
889 | goto out; | |
890 | ||
891 | /* look for virtio devices and register them */ | |
892 | ret = rproc_handle_virtio_rsc(rproc, table, tablesz); | |
893 | if (ret) | |
894 | goto out; | |
895 | ||
896 | out: | |
897 | release_firmware(fw); | |
898 | /* allow rproc_del() contexts, if any, to proceed */ | |
899 | complete_all(&rproc->firmware_loading_complete); | |
900 | } | |
901 | ||
902 | static int rproc_add_virtio_devices(struct rproc *rproc) | |
903 | { | |
904 | int ret; | |
905 | ||
906 | /* rproc_del() calls must wait until async loader completes */ | |
907 | init_completion(&rproc->firmware_loading_complete); | |
908 | ||
909 | /* | |
910 | * We must retrieve early virtio configuration info from | |
911 | * the firmware (e.g. whether to register a virtio device, | |
912 | * what virtio features does it support, ...). | |
913 | * | |
914 | * We're initiating an asynchronous firmware loading, so we can | |
915 | * be built-in kernel code, without hanging the boot process. | |
916 | */ | |
917 | ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG, | |
918 | rproc->firmware, &rproc->dev, GFP_KERNEL, | |
919 | rproc, rproc_fw_config_virtio); | |
920 | if (ret < 0) { | |
921 | dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret); | |
922 | complete_all(&rproc->firmware_loading_complete); | |
923 | } | |
924 | ||
925 | return ret; | |
926 | } | |
927 | ||
928 | /** | |
929 | * rproc_trigger_recovery() - recover a remoteproc | |
930 | * @rproc: the remote processor | |
931 | * | |
932 | * The recovery is done by reseting all the virtio devices, that way all the | |
933 | * rpmsg drivers will be reseted along with the remote processor making the | |
934 | * remoteproc functional again. | |
935 | * | |
936 | * This function can sleep, so it cannot be called from atomic context. | |
937 | */ | |
938 | int rproc_trigger_recovery(struct rproc *rproc) | |
939 | { | |
940 | struct rproc_vdev *rvdev, *rvtmp; | |
941 | ||
942 | dev_err(&rproc->dev, "recovering %s\n", rproc->name); | |
943 | ||
944 | init_completion(&rproc->crash_comp); | |
945 | ||
946 | /* clean up remote vdev entries */ | |
947 | list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node) | |
948 | rproc_remove_virtio_dev(rvdev); | |
949 | ||
950 | /* wait until there is no more rproc users */ | |
951 | wait_for_completion(&rproc->crash_comp); | |
952 | ||
953 | return rproc_add_virtio_devices(rproc); | |
954 | } | |
955 | ||
956 | /** | |
957 | * rproc_crash_handler_work() - handle a crash | |
958 | * | |
959 | * This function needs to handle everything related to a crash, like cpu | |
960 | * registers and stack dump, information to help to debug the fatal error, etc. | |
961 | */ | |
962 | static void rproc_crash_handler_work(struct work_struct *work) | |
963 | { | |
964 | struct rproc *rproc = container_of(work, struct rproc, crash_handler); | |
965 | struct device *dev = &rproc->dev; | |
966 | ||
967 | dev_dbg(dev, "enter %s\n", __func__); | |
968 | ||
969 | mutex_lock(&rproc->lock); | |
970 | ||
971 | if (rproc->state == RPROC_CRASHED || rproc->state == RPROC_OFFLINE) { | |
972 | /* handle only the first crash detected */ | |
973 | mutex_unlock(&rproc->lock); | |
974 | return; | |
975 | } | |
976 | ||
977 | rproc->state = RPROC_CRASHED; | |
978 | dev_err(dev, "handling crash #%u in %s\n", ++rproc->crash_cnt, | |
979 | rproc->name); | |
980 | ||
981 | mutex_unlock(&rproc->lock); | |
982 | ||
983 | if (!rproc->recovery_disabled) | |
984 | rproc_trigger_recovery(rproc); | |
985 | } | |
986 | ||
987 | /** | |
988 | * rproc_boot() - boot a remote processor | |
989 | * @rproc: handle of a remote processor | |
990 | * | |
991 | * Boot a remote processor (i.e. load its firmware, power it on, ...). | |
992 | * | |
993 | * If the remote processor is already powered on, this function immediately | |
994 | * returns (successfully). | |
995 | * | |
996 | * Returns 0 on success, and an appropriate error value otherwise. | |
997 | */ | |
998 | int rproc_boot(struct rproc *rproc) | |
999 | { | |
1000 | const struct firmware *firmware_p; | |
1001 | struct device *dev; | |
1002 | int ret; | |
1003 | ||
1004 | if (!rproc) { | |
1005 | pr_err("invalid rproc handle\n"); | |
1006 | return -EINVAL; | |
1007 | } | |
1008 | ||
1009 | dev = &rproc->dev; | |
1010 | ||
1011 | ret = mutex_lock_interruptible(&rproc->lock); | |
1012 | if (ret) { | |
1013 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); | |
1014 | return ret; | |
1015 | } | |
1016 | ||
1017 | /* loading a firmware is required */ | |
1018 | if (!rproc->firmware) { | |
1019 | dev_err(dev, "%s: no firmware to load\n", __func__); | |
1020 | ret = -EINVAL; | |
1021 | goto unlock_mutex; | |
1022 | } | |
1023 | ||
1024 | /* prevent underlying implementation from being removed */ | |
1025 | if (!try_module_get(dev->parent->driver->owner)) { | |
1026 | dev_err(dev, "%s: can't get owner\n", __func__); | |
1027 | ret = -EINVAL; | |
1028 | goto unlock_mutex; | |
1029 | } | |
1030 | ||
1031 | /* skip the boot process if rproc is already powered up */ | |
1032 | if (atomic_inc_return(&rproc->power) > 1) { | |
1033 | ret = 0; | |
1034 | goto unlock_mutex; | |
1035 | } | |
1036 | ||
1037 | dev_info(dev, "powering up %s\n", rproc->name); | |
1038 | ||
1039 | /* load firmware */ | |
1040 | ret = request_firmware(&firmware_p, rproc->firmware, dev); | |
1041 | if (ret < 0) { | |
1042 | dev_err(dev, "request_firmware failed: %d\n", ret); | |
1043 | goto downref_rproc; | |
1044 | } | |
1045 | ||
1046 | ret = rproc_fw_boot(rproc, firmware_p); | |
1047 | ||
1048 | release_firmware(firmware_p); | |
1049 | ||
1050 | downref_rproc: | |
1051 | if (ret) { | |
1052 | module_put(dev->parent->driver->owner); | |
1053 | atomic_dec(&rproc->power); | |
1054 | } | |
1055 | unlock_mutex: | |
1056 | mutex_unlock(&rproc->lock); | |
1057 | return ret; | |
1058 | } | |
1059 | EXPORT_SYMBOL(rproc_boot); | |
1060 | ||
1061 | /** | |
1062 | * rproc_shutdown() - power off the remote processor | |
1063 | * @rproc: the remote processor | |
1064 | * | |
1065 | * Power off a remote processor (previously booted with rproc_boot()). | |
1066 | * | |
1067 | * In case @rproc is still being used by an additional user(s), then | |
1068 | * this function will just decrement the power refcount and exit, | |
1069 | * without really powering off the device. | |
1070 | * | |
1071 | * Every call to rproc_boot() must (eventually) be accompanied by a call | |
1072 | * to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug. | |
1073 | * | |
1074 | * Notes: | |
1075 | * - we're not decrementing the rproc's refcount, only the power refcount. | |
1076 | * which means that the @rproc handle stays valid even after rproc_shutdown() | |
1077 | * returns, and users can still use it with a subsequent rproc_boot(), if | |
1078 | * needed. | |
1079 | */ | |
1080 | void rproc_shutdown(struct rproc *rproc) | |
1081 | { | |
1082 | struct device *dev = &rproc->dev; | |
1083 | int ret; | |
1084 | ||
1085 | ret = mutex_lock_interruptible(&rproc->lock); | |
1086 | if (ret) { | |
1087 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); | |
1088 | return; | |
1089 | } | |
1090 | ||
1091 | /* if the remote proc is still needed, bail out */ | |
1092 | if (!atomic_dec_and_test(&rproc->power)) | |
1093 | goto out; | |
1094 | ||
1095 | /* power off the remote processor */ | |
1096 | ret = rproc->ops->stop(rproc); | |
1097 | if (ret) { | |
1098 | atomic_inc(&rproc->power); | |
1099 | dev_err(dev, "can't stop rproc: %d\n", ret); | |
1100 | goto out; | |
1101 | } | |
1102 | ||
1103 | /* clean up all acquired resources */ | |
1104 | rproc_resource_cleanup(rproc); | |
1105 | ||
1106 | rproc_disable_iommu(rproc); | |
1107 | ||
1108 | /* if in crash state, unlock crash handler */ | |
1109 | if (rproc->state == RPROC_CRASHED) | |
1110 | complete_all(&rproc->crash_comp); | |
1111 | ||
1112 | rproc->state = RPROC_OFFLINE; | |
1113 | ||
1114 | dev_info(dev, "stopped remote processor %s\n", rproc->name); | |
1115 | ||
1116 | out: | |
1117 | mutex_unlock(&rproc->lock); | |
1118 | if (!ret) | |
1119 | module_put(dev->parent->driver->owner); | |
1120 | } | |
1121 | EXPORT_SYMBOL(rproc_shutdown); | |
1122 | ||
1123 | /** | |
1124 | * rproc_add() - register a remote processor | |
1125 | * @rproc: the remote processor handle to register | |
1126 | * | |
1127 | * Registers @rproc with the remoteproc framework, after it has been | |
1128 | * allocated with rproc_alloc(). | |
1129 | * | |
1130 | * This is called by the platform-specific rproc implementation, whenever | |
1131 | * a new remote processor device is probed. | |
1132 | * | |
1133 | * Returns 0 on success and an appropriate error code otherwise. | |
1134 | * | |
1135 | * Note: this function initiates an asynchronous firmware loading | |
1136 | * context, which will look for virtio devices supported by the rproc's | |
1137 | * firmware. | |
1138 | * | |
1139 | * If found, those virtio devices will be created and added, so as a result | |
1140 | * of registering this remote processor, additional virtio drivers might be | |
1141 | * probed. | |
1142 | */ | |
1143 | int rproc_add(struct rproc *rproc) | |
1144 | { | |
1145 | struct device *dev = &rproc->dev; | |
1146 | int ret; | |
1147 | ||
1148 | ret = device_add(dev); | |
1149 | if (ret < 0) | |
1150 | return ret; | |
1151 | ||
1152 | dev_info(dev, "%s is available\n", rproc->name); | |
1153 | ||
1154 | dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n"); | |
1155 | dev_info(dev, "THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.\n"); | |
1156 | ||
1157 | /* create debugfs entries */ | |
1158 | rproc_create_debug_dir(rproc); | |
1159 | ||
1160 | return rproc_add_virtio_devices(rproc); | |
1161 | } | |
1162 | EXPORT_SYMBOL(rproc_add); | |
1163 | ||
1164 | /** | |
1165 | * rproc_type_release() - release a remote processor instance | |
1166 | * @dev: the rproc's device | |
1167 | * | |
1168 | * This function should _never_ be called directly. | |
1169 | * | |
1170 | * It will be called by the driver core when no one holds a valid pointer | |
1171 | * to @dev anymore. | |
1172 | */ | |
1173 | static void rproc_type_release(struct device *dev) | |
1174 | { | |
1175 | struct rproc *rproc = container_of(dev, struct rproc, dev); | |
1176 | ||
1177 | dev_info(&rproc->dev, "releasing %s\n", rproc->name); | |
1178 | ||
1179 | rproc_delete_debug_dir(rproc); | |
1180 | ||
1181 | idr_destroy(&rproc->notifyids); | |
1182 | ||
1183 | if (rproc->index >= 0) | |
1184 | ida_simple_remove(&rproc_dev_index, rproc->index); | |
1185 | ||
1186 | kfree(rproc); | |
1187 | } | |
1188 | ||
1189 | static struct device_type rproc_type = { | |
1190 | .name = "remoteproc", | |
1191 | .release = rproc_type_release, | |
1192 | }; | |
1193 | ||
1194 | /** | |
1195 | * rproc_alloc() - allocate a remote processor handle | |
1196 | * @dev: the underlying device | |
1197 | * @name: name of this remote processor | |
1198 | * @ops: platform-specific handlers (mainly start/stop) | |
1199 | * @firmware: name of firmware file to load | |
1200 | * @len: length of private data needed by the rproc driver (in bytes) | |
1201 | * | |
1202 | * Allocates a new remote processor handle, but does not register | |
1203 | * it yet. | |
1204 | * | |
1205 | * This function should be used by rproc implementations during initialization | |
1206 | * of the remote processor. | |
1207 | * | |
1208 | * After creating an rproc handle using this function, and when ready, | |
1209 | * implementations should then call rproc_add() to complete | |
1210 | * the registration of the remote processor. | |
1211 | * | |
1212 | * On success the new rproc is returned, and on failure, NULL. | |
1213 | * | |
1214 | * Note: _never_ directly deallocate @rproc, even if it was not registered | |
1215 | * yet. Instead, when you need to unroll rproc_alloc(), use rproc_put(). | |
1216 | */ | |
1217 | struct rproc *rproc_alloc(struct device *dev, const char *name, | |
1218 | const struct rproc_ops *ops, | |
1219 | const char *firmware, int len) | |
1220 | { | |
1221 | struct rproc *rproc; | |
1222 | ||
1223 | if (!dev || !name || !ops) | |
1224 | return NULL; | |
1225 | ||
1226 | rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL); | |
1227 | if (!rproc) { | |
1228 | dev_err(dev, "%s: kzalloc failed\n", __func__); | |
1229 | return NULL; | |
1230 | } | |
1231 | ||
1232 | rproc->name = name; | |
1233 | rproc->ops = ops; | |
1234 | rproc->firmware = firmware; | |
1235 | rproc->priv = &rproc[1]; | |
1236 | ||
1237 | device_initialize(&rproc->dev); | |
1238 | rproc->dev.parent = dev; | |
1239 | rproc->dev.type = &rproc_type; | |
1240 | ||
1241 | /* Assign a unique device index and name */ | |
1242 | rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL); | |
1243 | if (rproc->index < 0) { | |
1244 | dev_err(dev, "ida_simple_get failed: %d\n", rproc->index); | |
1245 | put_device(&rproc->dev); | |
1246 | return NULL; | |
1247 | } | |
1248 | ||
1249 | dev_set_name(&rproc->dev, "remoteproc%d", rproc->index); | |
1250 | ||
1251 | atomic_set(&rproc->power, 0); | |
1252 | ||
1253 | /* Set ELF as the default fw_ops handler */ | |
1254 | rproc->fw_ops = &rproc_elf_fw_ops; | |
1255 | ||
1256 | mutex_init(&rproc->lock); | |
1257 | ||
1258 | idr_init(&rproc->notifyids); | |
1259 | ||
1260 | INIT_LIST_HEAD(&rproc->carveouts); | |
1261 | INIT_LIST_HEAD(&rproc->mappings); | |
1262 | INIT_LIST_HEAD(&rproc->traces); | |
1263 | INIT_LIST_HEAD(&rproc->rvdevs); | |
1264 | ||
1265 | INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work); | |
1266 | init_completion(&rproc->crash_comp); | |
1267 | ||
1268 | rproc->state = RPROC_OFFLINE; | |
1269 | ||
1270 | return rproc; | |
1271 | } | |
1272 | EXPORT_SYMBOL(rproc_alloc); | |
1273 | ||
1274 | /** | |
1275 | * rproc_put() - unroll rproc_alloc() | |
1276 | * @rproc: the remote processor handle | |
1277 | * | |
1278 | * This function decrements the rproc dev refcount. | |
1279 | * | |
1280 | * If no one holds any reference to rproc anymore, then its refcount would | |
1281 | * now drop to zero, and it would be freed. | |
1282 | */ | |
1283 | void rproc_put(struct rproc *rproc) | |
1284 | { | |
1285 | put_device(&rproc->dev); | |
1286 | } | |
1287 | EXPORT_SYMBOL(rproc_put); | |
1288 | ||
1289 | /** | |
1290 | * rproc_del() - unregister a remote processor | |
1291 | * @rproc: rproc handle to unregister | |
1292 | * | |
1293 | * This function should be called when the platform specific rproc | |
1294 | * implementation decides to remove the rproc device. it should | |
1295 | * _only_ be called if a previous invocation of rproc_add() | |
1296 | * has completed successfully. | |
1297 | * | |
1298 | * After rproc_del() returns, @rproc isn't freed yet, because | |
1299 | * of the outstanding reference created by rproc_alloc. To decrement that | |
1300 | * one last refcount, one still needs to call rproc_put(). | |
1301 | * | |
1302 | * Returns 0 on success and -EINVAL if @rproc isn't valid. | |
1303 | */ | |
1304 | int rproc_del(struct rproc *rproc) | |
1305 | { | |
1306 | struct rproc_vdev *rvdev, *tmp; | |
1307 | ||
1308 | if (!rproc) | |
1309 | return -EINVAL; | |
1310 | ||
1311 | /* if rproc is just being registered, wait */ | |
1312 | wait_for_completion(&rproc->firmware_loading_complete); | |
1313 | ||
1314 | /* clean up remote vdev entries */ | |
1315 | list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node) | |
1316 | rproc_remove_virtio_dev(rvdev); | |
1317 | ||
1318 | device_del(&rproc->dev); | |
1319 | ||
1320 | return 0; | |
1321 | } | |
1322 | EXPORT_SYMBOL(rproc_del); | |
1323 | ||
1324 | /** | |
1325 | * rproc_report_crash() - rproc crash reporter function | |
1326 | * @rproc: remote processor | |
1327 | * @type: crash type | |
1328 | * | |
1329 | * This function must be called every time a crash is detected by the low-level | |
1330 | * drivers implementing a specific remoteproc. This should not be called from a | |
1331 | * non-remoteproc driver. | |
1332 | * | |
1333 | * This function can be called from atomic/interrupt context. | |
1334 | */ | |
1335 | void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type) | |
1336 | { | |
1337 | if (!rproc) { | |
1338 | pr_err("NULL rproc pointer\n"); | |
1339 | return; | |
1340 | } | |
1341 | ||
1342 | dev_err(&rproc->dev, "crash detected in %s: type %s\n", | |
1343 | rproc->name, rproc_crash_to_string(type)); | |
1344 | ||
1345 | /* create a new task to handle the error */ | |
1346 | schedule_work(&rproc->crash_handler); | |
1347 | } | |
1348 | EXPORT_SYMBOL(rproc_report_crash); | |
1349 | ||
1350 | static int __init remoteproc_init(void) | |
1351 | { | |
1352 | rproc_init_debugfs(); | |
1353 | ||
1354 | return 0; | |
1355 | } | |
1356 | module_init(remoteproc_init); | |
1357 | ||
1358 | static void __exit remoteproc_exit(void) | |
1359 | { | |
1360 | rproc_exit_debugfs(); | |
1361 | } | |
1362 | module_exit(remoteproc_exit); | |
1363 | ||
1364 | MODULE_LICENSE("GPL v2"); | |
1365 | MODULE_DESCRIPTION("Generic Remote Processor Framework"); |