Root/
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"); |
1366 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9