Commit | Line | Data |
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400e64df OBC |
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> | |
b5ab5e24 | 38 | #include <linux/idr.h> |
400e64df OBC |
39 | #include <linux/klist.h> |
40 | #include <linux/elf.h> | |
41 | #include <linux/virtio_ids.h> | |
42 | #include <linux/virtio_ring.h> | |
cf59d3e9 | 43 | #include <asm/byteorder.h> |
400e64df OBC |
44 | |
45 | #include "remoteproc_internal.h" | |
46 | ||
47 | static void klist_rproc_get(struct klist_node *n); | |
48 | static void klist_rproc_put(struct klist_node *n); | |
49 | ||
50 | /* | |
51 | * klist of the available remote processors. | |
52 | * | |
53 | * We need this in order to support name-based lookups (needed by the | |
54 | * rproc_get_by_name()). | |
55 | * | |
7a186941 OBC |
56 | * That said, we don't use rproc_get_by_name() at this point. |
57 | * The use cases that do require its existence should be | |
400e64df OBC |
58 | * scrutinized, and hopefully migrated to rproc_boot() using device-based |
59 | * binding. | |
60 | * | |
61 | * If/when this materializes, we could drop the klist (and the by_name | |
62 | * API). | |
63 | */ | |
64 | static DEFINE_KLIST(rprocs, klist_rproc_get, klist_rproc_put); | |
65 | ||
66 | typedef int (*rproc_handle_resources_t)(struct rproc *rproc, | |
fd2c15ec OBC |
67 | struct resource_table *table, int len); |
68 | typedef int (*rproc_handle_resource_t)(struct rproc *rproc, void *, int avail); | |
400e64df | 69 | |
b5ab5e24 OBC |
70 | /* Unique indices for remoteproc devices */ |
71 | static DEFINE_IDA(rproc_dev_index); | |
72 | ||
400e64df OBC |
73 | /* |
74 | * This is the IOMMU fault handler we register with the IOMMU API | |
75 | * (when relevant; not all remote processors access memory through | |
76 | * an IOMMU). | |
77 | * | |
78 | * IOMMU core will invoke this handler whenever the remote processor | |
79 | * will try to access an unmapped device address. | |
80 | * | |
81 | * Currently this is mostly a stub, but it will be later used to trigger | |
82 | * the recovery of the remote processor. | |
83 | */ | |
84 | static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
77ca2332 | 85 | unsigned long iova, int flags, void *token) |
400e64df OBC |
86 | { |
87 | dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags); | |
88 | ||
89 | /* | |
90 | * Let the iommu core know we're not really handling this fault; | |
91 | * we just plan to use this as a recovery trigger. | |
92 | */ | |
93 | return -ENOSYS; | |
94 | } | |
95 | ||
96 | static int rproc_enable_iommu(struct rproc *rproc) | |
97 | { | |
98 | struct iommu_domain *domain; | |
b5ab5e24 | 99 | struct device *dev = rproc->dev.parent; |
400e64df OBC |
100 | int ret; |
101 | ||
102 | /* | |
103 | * We currently use iommu_present() to decide if an IOMMU | |
104 | * setup is needed. | |
105 | * | |
106 | * This works for simple cases, but will easily fail with | |
107 | * platforms that do have an IOMMU, but not for this specific | |
108 | * rproc. | |
109 | * | |
110 | * This will be easily solved by introducing hw capabilities | |
111 | * that will be set by the remoteproc driver. | |
112 | */ | |
113 | if (!iommu_present(dev->bus)) { | |
0798e1da MG |
114 | dev_dbg(dev, "iommu not found\n"); |
115 | return 0; | |
400e64df OBC |
116 | } |
117 | ||
118 | domain = iommu_domain_alloc(dev->bus); | |
119 | if (!domain) { | |
120 | dev_err(dev, "can't alloc iommu domain\n"); | |
121 | return -ENOMEM; | |
122 | } | |
123 | ||
77ca2332 | 124 | iommu_set_fault_handler(domain, rproc_iommu_fault, rproc); |
400e64df OBC |
125 | |
126 | ret = iommu_attach_device(domain, dev); | |
127 | if (ret) { | |
128 | dev_err(dev, "can't attach iommu device: %d\n", ret); | |
129 | goto free_domain; | |
130 | } | |
131 | ||
132 | rproc->domain = domain; | |
133 | ||
134 | return 0; | |
135 | ||
136 | free_domain: | |
137 | iommu_domain_free(domain); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static void rproc_disable_iommu(struct rproc *rproc) | |
142 | { | |
143 | struct iommu_domain *domain = rproc->domain; | |
b5ab5e24 | 144 | struct device *dev = rproc->dev.parent; |
400e64df OBC |
145 | |
146 | if (!domain) | |
147 | return; | |
148 | ||
149 | iommu_detach_device(domain, dev); | |
150 | iommu_domain_free(domain); | |
151 | ||
152 | return; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Some remote processors will ask us to allocate them physically contiguous | |
157 | * memory regions (which we call "carveouts"), and map them to specific | |
158 | * device addresses (which are hardcoded in the firmware). | |
159 | * | |
160 | * They may then ask us to copy objects into specific device addresses (e.g. | |
161 | * code/data sections) or expose us certain symbols in other device address | |
162 | * (e.g. their trace buffer). | |
163 | * | |
164 | * This function is an internal helper with which we can go over the allocated | |
165 | * carveouts and translate specific device address to kernel virtual addresses | |
166 | * so we can access the referenced memory. | |
167 | * | |
168 | * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too, | |
169 | * but only on kernel direct mapped RAM memory. Instead, we're just using | |
170 | * here the output of the DMA API, which should be more correct. | |
171 | */ | |
172 | static void *rproc_da_to_va(struct rproc *rproc, u64 da, int len) | |
173 | { | |
174 | struct rproc_mem_entry *carveout; | |
175 | void *ptr = NULL; | |
176 | ||
177 | list_for_each_entry(carveout, &rproc->carveouts, node) { | |
178 | int offset = da - carveout->da; | |
179 | ||
180 | /* try next carveout if da is too small */ | |
181 | if (offset < 0) | |
182 | continue; | |
183 | ||
184 | /* try next carveout if da is too large */ | |
185 | if (offset + len > carveout->len) | |
186 | continue; | |
187 | ||
188 | ptr = carveout->va + offset; | |
189 | ||
190 | break; | |
191 | } | |
192 | ||
193 | return ptr; | |
194 | } | |
195 | ||
196 | /** | |
197 | * rproc_load_segments() - load firmware segments to memory | |
198 | * @rproc: remote processor which will be booted using these fw segments | |
199 | * @elf_data: the content of the ELF firmware image | |
9bc91231 | 200 | * @len: firmware size (in bytes) |
400e64df OBC |
201 | * |
202 | * This function loads the firmware segments to memory, where the remote | |
203 | * processor expects them. | |
204 | * | |
205 | * Some remote processors will expect their code and data to be placed | |
206 | * in specific device addresses, and can't have them dynamically assigned. | |
207 | * | |
208 | * We currently support only those kind of remote processors, and expect | |
209 | * the program header's paddr member to contain those addresses. We then go | |
210 | * through the physically contiguous "carveout" memory regions which we | |
211 | * allocated (and mapped) earlier on behalf of the remote processor, | |
212 | * and "translate" device address to kernel addresses, so we can copy the | |
213 | * segments where they are expected. | |
214 | * | |
215 | * Currently we only support remote processors that required carveout | |
216 | * allocations and got them mapped onto their iommus. Some processors | |
217 | * might be different: they might not have iommus, and would prefer to | |
218 | * directly allocate memory for every segment/resource. This is not yet | |
219 | * supported, though. | |
220 | */ | |
9bc91231 OBC |
221 | static int |
222 | rproc_load_segments(struct rproc *rproc, const u8 *elf_data, size_t len) | |
400e64df | 223 | { |
b5ab5e24 | 224 | struct device *dev = &rproc->dev; |
400e64df OBC |
225 | struct elf32_hdr *ehdr; |
226 | struct elf32_phdr *phdr; | |
227 | int i, ret = 0; | |
228 | ||
229 | ehdr = (struct elf32_hdr *)elf_data; | |
230 | phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff); | |
231 | ||
232 | /* go through the available ELF segments */ | |
233 | for (i = 0; i < ehdr->e_phnum; i++, phdr++) { | |
234 | u32 da = phdr->p_paddr; | |
235 | u32 memsz = phdr->p_memsz; | |
236 | u32 filesz = phdr->p_filesz; | |
9bc91231 | 237 | u32 offset = phdr->p_offset; |
400e64df OBC |
238 | void *ptr; |
239 | ||
240 | if (phdr->p_type != PT_LOAD) | |
241 | continue; | |
242 | ||
243 | dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n", | |
244 | phdr->p_type, da, memsz, filesz); | |
245 | ||
246 | if (filesz > memsz) { | |
247 | dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n", | |
248 | filesz, memsz); | |
249 | ret = -EINVAL; | |
250 | break; | |
251 | } | |
252 | ||
9bc91231 OBC |
253 | if (offset + filesz > len) { |
254 | dev_err(dev, "truncated fw: need 0x%x avail 0x%x\n", | |
255 | offset + filesz, len); | |
256 | ret = -EINVAL; | |
257 | break; | |
258 | } | |
259 | ||
400e64df OBC |
260 | /* grab the kernel address for this device address */ |
261 | ptr = rproc_da_to_va(rproc, da, memsz); | |
262 | if (!ptr) { | |
263 | dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz); | |
264 | ret = -EINVAL; | |
265 | break; | |
266 | } | |
267 | ||
268 | /* put the segment where the remote processor expects it */ | |
269 | if (phdr->p_filesz) | |
270 | memcpy(ptr, elf_data + phdr->p_offset, filesz); | |
271 | ||
272 | /* | |
273 | * Zero out remaining memory for this segment. | |
274 | * | |
275 | * This isn't strictly required since dma_alloc_coherent already | |
276 | * did this for us. albeit harmless, we may consider removing | |
277 | * this. | |
278 | */ | |
279 | if (memsz > filesz) | |
280 | memset(ptr + filesz, 0, memsz - filesz); | |
281 | } | |
282 | ||
283 | return ret; | |
284 | } | |
285 | ||
6db20ea8 | 286 | int rproc_alloc_vring(struct rproc_vdev *rvdev, int i) |
400e64df | 287 | { |
7a186941 | 288 | struct rproc *rproc = rvdev->rproc; |
b5ab5e24 | 289 | struct device *dev = &rproc->dev; |
6db20ea8 | 290 | struct rproc_vring *rvring = &rvdev->vring[i]; |
7a186941 OBC |
291 | dma_addr_t dma; |
292 | void *va; | |
293 | int ret, size, notifyid; | |
400e64df | 294 | |
7a186941 | 295 | /* actual size of vring (in bytes) */ |
6db20ea8 | 296 | size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); |
7a186941 OBC |
297 | |
298 | if (!idr_pre_get(&rproc->notifyids, GFP_KERNEL)) { | |
299 | dev_err(dev, "idr_pre_get failed\n"); | |
300 | return -ENOMEM; | |
301 | } | |
302 | ||
303 | /* | |
304 | * Allocate non-cacheable memory for the vring. In the future | |
305 | * this call will also configure the IOMMU for us | |
6db20ea8 | 306 | * TODO: let the rproc know the da of this vring |
7a186941 | 307 | */ |
b5ab5e24 | 308 | va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL); |
7a186941 | 309 | if (!va) { |
b5ab5e24 | 310 | dev_err(dev->parent, "dma_alloc_coherent failed\n"); |
400e64df OBC |
311 | return -EINVAL; |
312 | } | |
313 | ||
6db20ea8 OBC |
314 | /* |
315 | * Assign an rproc-wide unique index for this vring | |
316 | * TODO: assign a notifyid for rvdev updates as well | |
317 | * TODO: let the rproc know the notifyid of this vring | |
318 | * TODO: support predefined notifyids (via resource table) | |
319 | */ | |
320 | ret = idr_get_new(&rproc->notifyids, rvring, ¬ifyid); | |
7a186941 OBC |
321 | if (ret) { |
322 | dev_err(dev, "idr_get_new failed: %d\n", ret); | |
b5ab5e24 | 323 | dma_free_coherent(dev->parent, size, va, dma); |
7a186941 OBC |
324 | return ret; |
325 | } | |
400e64df | 326 | |
7a186941 OBC |
327 | dev_dbg(dev, "vring%d: va %p dma %x size %x idr %d\n", i, va, |
328 | dma, size, notifyid); | |
329 | ||
6db20ea8 OBC |
330 | rvring->va = va; |
331 | rvring->dma = dma; | |
332 | rvring->notifyid = notifyid; | |
400e64df OBC |
333 | |
334 | return 0; | |
335 | } | |
336 | ||
6db20ea8 OBC |
337 | static int |
338 | rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i) | |
7a186941 OBC |
339 | { |
340 | struct rproc *rproc = rvdev->rproc; | |
b5ab5e24 | 341 | struct device *dev = &rproc->dev; |
6db20ea8 OBC |
342 | struct fw_rsc_vdev_vring *vring = &rsc->vring[i]; |
343 | struct rproc_vring *rvring = &rvdev->vring[i]; | |
7a186941 | 344 | |
6db20ea8 OBC |
345 | dev_dbg(dev, "vdev rsc: vring%d: da %x, qsz %d, align %d\n", |
346 | i, vring->da, vring->num, vring->align); | |
347 | ||
348 | /* make sure reserved bytes are zeroes */ | |
349 | if (vring->reserved) { | |
350 | dev_err(dev, "vring rsc has non zero reserved bytes\n"); | |
351 | return -EINVAL; | |
352 | } | |
7a186941 | 353 | |
6db20ea8 OBC |
354 | /* verify queue size and vring alignment are sane */ |
355 | if (!vring->num || !vring->align) { | |
356 | dev_err(dev, "invalid qsz (%d) or alignment (%d)\n", | |
357 | vring->num, vring->align); | |
358 | return -EINVAL; | |
7a186941 | 359 | } |
6db20ea8 OBC |
360 | |
361 | rvring->len = vring->num; | |
362 | rvring->align = vring->align; | |
363 | rvring->rvdev = rvdev; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | void rproc_free_vring(struct rproc_vring *rvring) | |
369 | { | |
370 | int size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); | |
371 | struct rproc *rproc = rvring->rvdev->rproc; | |
372 | ||
b5ab5e24 | 373 | dma_free_coherent(rproc->dev.parent, size, rvring->va, rvring->dma); |
6db20ea8 | 374 | idr_remove(&rproc->notifyids, rvring->notifyid); |
7a186941 OBC |
375 | } |
376 | ||
400e64df | 377 | /** |
fd2c15ec | 378 | * rproc_handle_vdev() - handle a vdev fw resource |
400e64df OBC |
379 | * @rproc: the remote processor |
380 | * @rsc: the vring resource descriptor | |
fd2c15ec | 381 | * @avail: size of available data (for sanity checking the image) |
400e64df | 382 | * |
7a186941 OBC |
383 | * This resource entry requests the host to statically register a virtio |
384 | * device (vdev), and setup everything needed to support it. It contains | |
385 | * everything needed to make it possible: the virtio device id, virtio | |
386 | * device features, vrings information, virtio config space, etc... | |
387 | * | |
388 | * Before registering the vdev, the vrings are allocated from non-cacheable | |
389 | * physically contiguous memory. Currently we only support two vrings per | |
390 | * remote processor (temporary limitation). We might also want to consider | |
391 | * doing the vring allocation only later when ->find_vqs() is invoked, and | |
392 | * then release them upon ->del_vqs(). | |
393 | * | |
394 | * Note: @da is currently not really handled correctly: we dynamically | |
395 | * allocate it using the DMA API, ignoring requested hard coded addresses, | |
396 | * and we don't take care of any required IOMMU programming. This is all | |
397 | * going to be taken care of when the generic iommu-based DMA API will be | |
398 | * merged. Meanwhile, statically-addressed iommu-based firmware images should | |
399 | * use RSC_DEVMEM resource entries to map their required @da to the physical | |
400 | * address of their base CMA region (ouch, hacky!). | |
400e64df OBC |
401 | * |
402 | * Returns 0 on success, or an appropriate error code otherwise | |
403 | */ | |
fd2c15ec OBC |
404 | static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, |
405 | int avail) | |
400e64df | 406 | { |
b5ab5e24 | 407 | struct device *dev = &rproc->dev; |
7a186941 OBC |
408 | struct rproc_vdev *rvdev; |
409 | int i, ret; | |
400e64df | 410 | |
fd2c15ec OBC |
411 | /* make sure resource isn't truncated */ |
412 | if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring) | |
413 | + rsc->config_len > avail) { | |
b5ab5e24 | 414 | dev_err(dev, "vdev rsc is truncated\n"); |
400e64df OBC |
415 | return -EINVAL; |
416 | } | |
417 | ||
fd2c15ec OBC |
418 | /* make sure reserved bytes are zeroes */ |
419 | if (rsc->reserved[0] || rsc->reserved[1]) { | |
420 | dev_err(dev, "vdev rsc has non zero reserved bytes\n"); | |
400e64df OBC |
421 | return -EINVAL; |
422 | } | |
423 | ||
fd2c15ec OBC |
424 | dev_dbg(dev, "vdev rsc: id %d, dfeatures %x, cfg len %d, %d vrings\n", |
425 | rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings); | |
426 | ||
7a186941 OBC |
427 | /* we currently support only two vrings per rvdev */ |
428 | if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) { | |
fd2c15ec | 429 | dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings); |
400e64df OBC |
430 | return -EINVAL; |
431 | } | |
432 | ||
7a186941 OBC |
433 | rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL); |
434 | if (!rvdev) | |
435 | return -ENOMEM; | |
400e64df | 436 | |
7a186941 | 437 | rvdev->rproc = rproc; |
400e64df | 438 | |
6db20ea8 | 439 | /* parse the vrings */ |
7a186941 | 440 | for (i = 0; i < rsc->num_of_vrings; i++) { |
6db20ea8 | 441 | ret = rproc_parse_vring(rvdev, rsc, i); |
7a186941 | 442 | if (ret) |
6db20ea8 | 443 | goto free_rvdev; |
7a186941 | 444 | } |
400e64df | 445 | |
7a186941 OBC |
446 | /* remember the device features */ |
447 | rvdev->dfeatures = rsc->dfeatures; | |
fd2c15ec | 448 | |
7a186941 | 449 | list_add_tail(&rvdev->node, &rproc->rvdevs); |
fd2c15ec | 450 | |
7a186941 OBC |
451 | /* it is now safe to add the virtio device */ |
452 | ret = rproc_add_virtio_dev(rvdev, rsc->id); | |
453 | if (ret) | |
6db20ea8 | 454 | goto free_rvdev; |
400e64df OBC |
455 | |
456 | return 0; | |
7a186941 | 457 | |
6db20ea8 | 458 | free_rvdev: |
7a186941 OBC |
459 | kfree(rvdev); |
460 | return ret; | |
400e64df OBC |
461 | } |
462 | ||
463 | /** | |
464 | * rproc_handle_trace() - handle a shared trace buffer resource | |
465 | * @rproc: the remote processor | |
466 | * @rsc: the trace resource descriptor | |
fd2c15ec | 467 | * @avail: size of available data (for sanity checking the image) |
400e64df OBC |
468 | * |
469 | * In case the remote processor dumps trace logs into memory, | |
470 | * export it via debugfs. | |
471 | * | |
472 | * Currently, the 'da' member of @rsc should contain the device address | |
473 | * where the remote processor is dumping the traces. Later we could also | |
474 | * support dynamically allocating this address using the generic | |
475 | * DMA API (but currently there isn't a use case for that). | |
476 | * | |
477 | * Returns 0 on success, or an appropriate error code otherwise | |
478 | */ | |
fd2c15ec OBC |
479 | static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc, |
480 | int avail) | |
400e64df OBC |
481 | { |
482 | struct rproc_mem_entry *trace; | |
b5ab5e24 | 483 | struct device *dev = &rproc->dev; |
400e64df OBC |
484 | void *ptr; |
485 | char name[15]; | |
486 | ||
fd2c15ec | 487 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 488 | dev_err(dev, "trace rsc is truncated\n"); |
fd2c15ec OBC |
489 | return -EINVAL; |
490 | } | |
491 | ||
492 | /* make sure reserved bytes are zeroes */ | |
493 | if (rsc->reserved) { | |
494 | dev_err(dev, "trace rsc has non zero reserved bytes\n"); | |
495 | return -EINVAL; | |
496 | } | |
497 | ||
400e64df OBC |
498 | /* what's the kernel address of this resource ? */ |
499 | ptr = rproc_da_to_va(rproc, rsc->da, rsc->len); | |
500 | if (!ptr) { | |
501 | dev_err(dev, "erroneous trace resource entry\n"); | |
502 | return -EINVAL; | |
503 | } | |
504 | ||
505 | trace = kzalloc(sizeof(*trace), GFP_KERNEL); | |
506 | if (!trace) { | |
507 | dev_err(dev, "kzalloc trace failed\n"); | |
508 | return -ENOMEM; | |
509 | } | |
510 | ||
511 | /* set the trace buffer dma properties */ | |
512 | trace->len = rsc->len; | |
513 | trace->va = ptr; | |
514 | ||
515 | /* make sure snprintf always null terminates, even if truncating */ | |
516 | snprintf(name, sizeof(name), "trace%d", rproc->num_traces); | |
517 | ||
518 | /* create the debugfs entry */ | |
519 | trace->priv = rproc_create_trace_file(name, rproc, trace); | |
520 | if (!trace->priv) { | |
521 | trace->va = NULL; | |
522 | kfree(trace); | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | list_add_tail(&trace->node, &rproc->traces); | |
527 | ||
528 | rproc->num_traces++; | |
529 | ||
fd2c15ec | 530 | dev_dbg(dev, "%s added: va %p, da 0x%x, len 0x%x\n", name, ptr, |
400e64df OBC |
531 | rsc->da, rsc->len); |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | /** | |
537 | * rproc_handle_devmem() - handle devmem resource entry | |
538 | * @rproc: remote processor handle | |
539 | * @rsc: the devmem resource entry | |
fd2c15ec | 540 | * @avail: size of available data (for sanity checking the image) |
400e64df OBC |
541 | * |
542 | * Remote processors commonly need to access certain on-chip peripherals. | |
543 | * | |
544 | * Some of these remote processors access memory via an iommu device, | |
545 | * and might require us to configure their iommu before they can access | |
546 | * the on-chip peripherals they need. | |
547 | * | |
548 | * This resource entry is a request to map such a peripheral device. | |
549 | * | |
550 | * These devmem entries will contain the physical address of the device in | |
551 | * the 'pa' member. If a specific device address is expected, then 'da' will | |
552 | * contain it (currently this is the only use case supported). 'len' will | |
553 | * contain the size of the physical region we need to map. | |
554 | * | |
555 | * Currently we just "trust" those devmem entries to contain valid physical | |
556 | * addresses, but this is going to change: we want the implementations to | |
557 | * tell us ranges of physical addresses the firmware is allowed to request, | |
558 | * and not allow firmwares to request access to physical addresses that | |
559 | * are outside those ranges. | |
560 | */ | |
fd2c15ec OBC |
561 | static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc, |
562 | int avail) | |
400e64df OBC |
563 | { |
564 | struct rproc_mem_entry *mapping; | |
b5ab5e24 | 565 | struct device *dev = &rproc->dev; |
400e64df OBC |
566 | int ret; |
567 | ||
568 | /* no point in handling this resource without a valid iommu domain */ | |
569 | if (!rproc->domain) | |
570 | return -EINVAL; | |
571 | ||
fd2c15ec | 572 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 573 | dev_err(dev, "devmem rsc is truncated\n"); |
fd2c15ec OBC |
574 | return -EINVAL; |
575 | } | |
576 | ||
577 | /* make sure reserved bytes are zeroes */ | |
578 | if (rsc->reserved) { | |
b5ab5e24 | 579 | dev_err(dev, "devmem rsc has non zero reserved bytes\n"); |
fd2c15ec OBC |
580 | return -EINVAL; |
581 | } | |
582 | ||
400e64df OBC |
583 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); |
584 | if (!mapping) { | |
b5ab5e24 | 585 | dev_err(dev, "kzalloc mapping failed\n"); |
400e64df OBC |
586 | return -ENOMEM; |
587 | } | |
588 | ||
589 | ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags); | |
590 | if (ret) { | |
b5ab5e24 | 591 | dev_err(dev, "failed to map devmem: %d\n", ret); |
400e64df OBC |
592 | goto out; |
593 | } | |
594 | ||
595 | /* | |
596 | * We'll need this info later when we'll want to unmap everything | |
597 | * (e.g. on shutdown). | |
598 | * | |
599 | * We can't trust the remote processor not to change the resource | |
600 | * table, so we must maintain this info independently. | |
601 | */ | |
602 | mapping->da = rsc->da; | |
603 | mapping->len = rsc->len; | |
604 | list_add_tail(&mapping->node, &rproc->mappings); | |
605 | ||
b5ab5e24 | 606 | dev_dbg(dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n", |
400e64df OBC |
607 | rsc->pa, rsc->da, rsc->len); |
608 | ||
609 | return 0; | |
610 | ||
611 | out: | |
612 | kfree(mapping); | |
613 | return ret; | |
614 | } | |
615 | ||
616 | /** | |
617 | * rproc_handle_carveout() - handle phys contig memory allocation requests | |
618 | * @rproc: rproc handle | |
619 | * @rsc: the resource entry | |
fd2c15ec | 620 | * @avail: size of available data (for image validation) |
400e64df OBC |
621 | * |
622 | * This function will handle firmware requests for allocation of physically | |
623 | * contiguous memory regions. | |
624 | * | |
625 | * These request entries should come first in the firmware's resource table, | |
626 | * as other firmware entries might request placing other data objects inside | |
627 | * these memory regions (e.g. data/code segments, trace resource entries, ...). | |
628 | * | |
629 | * Allocating memory this way helps utilizing the reserved physical memory | |
630 | * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries | |
631 | * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB | |
632 | * pressure is important; it may have a substantial impact on performance. | |
633 | */ | |
fd2c15ec OBC |
634 | static int rproc_handle_carveout(struct rproc *rproc, |
635 | struct fw_rsc_carveout *rsc, int avail) | |
400e64df OBC |
636 | { |
637 | struct rproc_mem_entry *carveout, *mapping; | |
b5ab5e24 | 638 | struct device *dev = &rproc->dev; |
400e64df OBC |
639 | dma_addr_t dma; |
640 | void *va; | |
641 | int ret; | |
642 | ||
fd2c15ec | 643 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 644 | dev_err(dev, "carveout rsc is truncated\n"); |
fd2c15ec OBC |
645 | return -EINVAL; |
646 | } | |
647 | ||
648 | /* make sure reserved bytes are zeroes */ | |
649 | if (rsc->reserved) { | |
650 | dev_err(dev, "carveout rsc has non zero reserved bytes\n"); | |
651 | return -EINVAL; | |
652 | } | |
653 | ||
654 | dev_dbg(dev, "carveout rsc: da %x, pa %x, len %x, flags %x\n", | |
655 | rsc->da, rsc->pa, rsc->len, rsc->flags); | |
656 | ||
400e64df OBC |
657 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); |
658 | if (!mapping) { | |
659 | dev_err(dev, "kzalloc mapping failed\n"); | |
660 | return -ENOMEM; | |
661 | } | |
662 | ||
663 | carveout = kzalloc(sizeof(*carveout), GFP_KERNEL); | |
664 | if (!carveout) { | |
665 | dev_err(dev, "kzalloc carveout failed\n"); | |
666 | ret = -ENOMEM; | |
667 | goto free_mapping; | |
668 | } | |
669 | ||
b5ab5e24 | 670 | va = dma_alloc_coherent(dev->parent, rsc->len, &dma, GFP_KERNEL); |
400e64df | 671 | if (!va) { |
b5ab5e24 | 672 | dev_err(dev->parent, "dma_alloc_coherent err: %d\n", rsc->len); |
400e64df OBC |
673 | ret = -ENOMEM; |
674 | goto free_carv; | |
675 | } | |
676 | ||
677 | dev_dbg(dev, "carveout va %p, dma %x, len 0x%x\n", va, dma, rsc->len); | |
678 | ||
679 | /* | |
680 | * Ok, this is non-standard. | |
681 | * | |
682 | * Sometimes we can't rely on the generic iommu-based DMA API | |
683 | * to dynamically allocate the device address and then set the IOMMU | |
684 | * tables accordingly, because some remote processors might | |
685 | * _require_ us to use hard coded device addresses that their | |
686 | * firmware was compiled with. | |
687 | * | |
688 | * In this case, we must use the IOMMU API directly and map | |
689 | * the memory to the device address as expected by the remote | |
690 | * processor. | |
691 | * | |
692 | * Obviously such remote processor devices should not be configured | |
693 | * to use the iommu-based DMA API: we expect 'dma' to contain the | |
694 | * physical address in this case. | |
695 | */ | |
696 | if (rproc->domain) { | |
697 | ret = iommu_map(rproc->domain, rsc->da, dma, rsc->len, | |
698 | rsc->flags); | |
699 | if (ret) { | |
700 | dev_err(dev, "iommu_map failed: %d\n", ret); | |
701 | goto dma_free; | |
702 | } | |
703 | ||
704 | /* | |
705 | * We'll need this info later when we'll want to unmap | |
706 | * everything (e.g. on shutdown). | |
707 | * | |
708 | * We can't trust the remote processor not to change the | |
709 | * resource table, so we must maintain this info independently. | |
710 | */ | |
711 | mapping->da = rsc->da; | |
712 | mapping->len = rsc->len; | |
713 | list_add_tail(&mapping->node, &rproc->mappings); | |
714 | ||
fd2c15ec | 715 | dev_dbg(dev, "carveout mapped 0x%x to 0x%x\n", rsc->da, dma); |
400e64df OBC |
716 | |
717 | /* | |
718 | * Some remote processors might need to know the pa | |
719 | * even though they are behind an IOMMU. E.g., OMAP4's | |
720 | * remote M3 processor needs this so it can control | |
721 | * on-chip hardware accelerators that are not behind | |
722 | * the IOMMU, and therefor must know the pa. | |
723 | * | |
724 | * Generally we don't want to expose physical addresses | |
725 | * if we don't have to (remote processors are generally | |
726 | * _not_ trusted), so we might want to do this only for | |
727 | * remote processor that _must_ have this (e.g. OMAP4's | |
728 | * dual M3 subsystem). | |
729 | */ | |
730 | rsc->pa = dma; | |
731 | } | |
732 | ||
733 | carveout->va = va; | |
734 | carveout->len = rsc->len; | |
735 | carveout->dma = dma; | |
736 | carveout->da = rsc->da; | |
737 | ||
738 | list_add_tail(&carveout->node, &rproc->carveouts); | |
739 | ||
740 | return 0; | |
741 | ||
742 | dma_free: | |
b5ab5e24 | 743 | dma_free_coherent(dev->parent, rsc->len, va, dma); |
400e64df OBC |
744 | free_carv: |
745 | kfree(carveout); | |
746 | free_mapping: | |
747 | kfree(mapping); | |
748 | return ret; | |
749 | } | |
750 | ||
e12bc14b OBC |
751 | /* |
752 | * A lookup table for resource handlers. The indices are defined in | |
753 | * enum fw_resource_type. | |
754 | */ | |
755 | static rproc_handle_resource_t rproc_handle_rsc[] = { | |
fd2c15ec OBC |
756 | [RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout, |
757 | [RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem, | |
758 | [RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace, | |
7a186941 | 759 | [RSC_VDEV] = NULL, /* VDEVs were handled upon registrarion */ |
e12bc14b OBC |
760 | }; |
761 | ||
400e64df OBC |
762 | /* handle firmware resource entries before booting the remote processor */ |
763 | static int | |
fd2c15ec | 764 | rproc_handle_boot_rsc(struct rproc *rproc, struct resource_table *table, int len) |
400e64df | 765 | { |
b5ab5e24 | 766 | struct device *dev = &rproc->dev; |
e12bc14b | 767 | rproc_handle_resource_t handler; |
fd2c15ec OBC |
768 | int ret = 0, i; |
769 | ||
770 | for (i = 0; i < table->num; i++) { | |
771 | int offset = table->offset[i]; | |
772 | struct fw_rsc_hdr *hdr = (void *)table + offset; | |
773 | int avail = len - offset - sizeof(*hdr); | |
774 | void *rsc = (void *)hdr + sizeof(*hdr); | |
775 | ||
776 | /* make sure table isn't truncated */ | |
777 | if (avail < 0) { | |
778 | dev_err(dev, "rsc table is truncated\n"); | |
779 | return -EINVAL; | |
780 | } | |
400e64df | 781 | |
fd2c15ec | 782 | dev_dbg(dev, "rsc: type %d\n", hdr->type); |
400e64df | 783 | |
fd2c15ec OBC |
784 | if (hdr->type >= RSC_LAST) { |
785 | dev_warn(dev, "unsupported resource %d\n", hdr->type); | |
e12bc14b | 786 | continue; |
400e64df OBC |
787 | } |
788 | ||
fd2c15ec | 789 | handler = rproc_handle_rsc[hdr->type]; |
e12bc14b OBC |
790 | if (!handler) |
791 | continue; | |
792 | ||
fd2c15ec | 793 | ret = handler(rproc, rsc, avail); |
400e64df OBC |
794 | if (ret) |
795 | break; | |
400e64df OBC |
796 | } |
797 | ||
798 | return ret; | |
799 | } | |
800 | ||
801 | /* handle firmware resource entries while registering the remote processor */ | |
802 | static int | |
fd2c15ec | 803 | rproc_handle_virtio_rsc(struct rproc *rproc, struct resource_table *table, int len) |
400e64df | 804 | { |
b5ab5e24 | 805 | struct device *dev = &rproc->dev; |
fd2c15ec OBC |
806 | int ret = 0, i; |
807 | ||
808 | for (i = 0; i < table->num; i++) { | |
809 | int offset = table->offset[i]; | |
810 | struct fw_rsc_hdr *hdr = (void *)table + offset; | |
811 | int avail = len - offset - sizeof(*hdr); | |
7a186941 | 812 | struct fw_rsc_vdev *vrsc; |
400e64df | 813 | |
fd2c15ec OBC |
814 | /* make sure table isn't truncated */ |
815 | if (avail < 0) { | |
816 | dev_err(dev, "rsc table is truncated\n"); | |
817 | return -EINVAL; | |
818 | } | |
819 | ||
820 | dev_dbg(dev, "%s: rsc type %d\n", __func__, hdr->type); | |
821 | ||
7a186941 OBC |
822 | if (hdr->type != RSC_VDEV) |
823 | continue; | |
824 | ||
825 | vrsc = (struct fw_rsc_vdev *)hdr->data; | |
826 | ||
827 | ret = rproc_handle_vdev(rproc, vrsc, avail); | |
828 | if (ret) | |
400e64df | 829 | break; |
fd2c15ec | 830 | } |
400e64df OBC |
831 | |
832 | return ret; | |
833 | } | |
834 | ||
835 | /** | |
1e3e2c7c | 836 | * rproc_find_rsc_table() - find the resource table |
400e64df OBC |
837 | * @rproc: the rproc handle |
838 | * @elf_data: the content of the ELF firmware image | |
9bc91231 | 839 | * @len: firmware size (in bytes) |
1e3e2c7c | 840 | * @tablesz: place holder for providing back the table size |
400e64df OBC |
841 | * |
842 | * This function finds the resource table inside the remote processor's | |
1e3e2c7c OBC |
843 | * firmware. It is used both upon the registration of @rproc (in order |
844 | * to look for and register the supported virito devices), and when the | |
845 | * @rproc is booted. | |
400e64df | 846 | * |
1e3e2c7c OBC |
847 | * Returns the pointer to the resource table if it is found, and write its |
848 | * size into @tablesz. If a valid table isn't found, NULL is returned | |
849 | * (and @tablesz isn't set). | |
400e64df | 850 | */ |
1e3e2c7c OBC |
851 | static struct resource_table * |
852 | rproc_find_rsc_table(struct rproc *rproc, const u8 *elf_data, size_t len, | |
853 | int *tablesz) | |
400e64df OBC |
854 | { |
855 | struct elf32_hdr *ehdr; | |
856 | struct elf32_shdr *shdr; | |
857 | const char *name_table; | |
b5ab5e24 | 858 | struct device *dev = &rproc->dev; |
1e3e2c7c OBC |
859 | struct resource_table *table = NULL; |
860 | int i; | |
400e64df OBC |
861 | |
862 | ehdr = (struct elf32_hdr *)elf_data; | |
863 | shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff); | |
864 | name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset; | |
865 | ||
866 | /* look for the resource table and handle it */ | |
867 | for (i = 0; i < ehdr->e_shnum; i++, shdr++) { | |
fd2c15ec OBC |
868 | int size = shdr->sh_size; |
869 | int offset = shdr->sh_offset; | |
400e64df | 870 | |
fd2c15ec OBC |
871 | if (strcmp(name_table + shdr->sh_name, ".resource_table")) |
872 | continue; | |
9bc91231 | 873 | |
fd2c15ec | 874 | table = (struct resource_table *)(elf_data + offset); |
400e64df | 875 | |
fd2c15ec OBC |
876 | /* make sure we have the entire table */ |
877 | if (offset + size > len) { | |
878 | dev_err(dev, "resource table truncated\n"); | |
1e3e2c7c | 879 | return NULL; |
fd2c15ec OBC |
880 | } |
881 | ||
882 | /* make sure table has at least the header */ | |
883 | if (sizeof(struct resource_table) > size) { | |
884 | dev_err(dev, "header-less resource table\n"); | |
1e3e2c7c | 885 | return NULL; |
400e64df | 886 | } |
fd2c15ec OBC |
887 | |
888 | /* we don't support any version beyond the first */ | |
889 | if (table->ver != 1) { | |
890 | dev_err(dev, "unsupported fw ver: %d\n", table->ver); | |
1e3e2c7c | 891 | return NULL; |
fd2c15ec OBC |
892 | } |
893 | ||
894 | /* make sure reserved bytes are zeroes */ | |
895 | if (table->reserved[0] || table->reserved[1]) { | |
896 | dev_err(dev, "non zero reserved bytes\n"); | |
1e3e2c7c | 897 | return NULL; |
fd2c15ec OBC |
898 | } |
899 | ||
900 | /* make sure the offsets array isn't truncated */ | |
901 | if (table->num * sizeof(table->offset[0]) + | |
902 | sizeof(struct resource_table) > size) { | |
903 | dev_err(dev, "resource table incomplete\n"); | |
1e3e2c7c | 904 | return NULL; |
fd2c15ec OBC |
905 | } |
906 | ||
1e3e2c7c | 907 | *tablesz = shdr->sh_size; |
fd2c15ec | 908 | break; |
400e64df OBC |
909 | } |
910 | ||
1e3e2c7c | 911 | return table; |
400e64df OBC |
912 | } |
913 | ||
914 | /** | |
915 | * rproc_resource_cleanup() - clean up and free all acquired resources | |
916 | * @rproc: rproc handle | |
917 | * | |
918 | * This function will free all resources acquired for @rproc, and it | |
7a186941 | 919 | * is called whenever @rproc either shuts down or fails to boot. |
400e64df OBC |
920 | */ |
921 | static void rproc_resource_cleanup(struct rproc *rproc) | |
922 | { | |
923 | struct rproc_mem_entry *entry, *tmp; | |
b5ab5e24 | 924 | struct device *dev = &rproc->dev; |
400e64df OBC |
925 | |
926 | /* clean up debugfs trace entries */ | |
927 | list_for_each_entry_safe(entry, tmp, &rproc->traces, node) { | |
928 | rproc_remove_trace_file(entry->priv); | |
929 | rproc->num_traces--; | |
930 | list_del(&entry->node); | |
931 | kfree(entry); | |
932 | } | |
933 | ||
400e64df OBC |
934 | /* clean up carveout allocations */ |
935 | list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) { | |
b5ab5e24 | 936 | dma_free_coherent(dev->parent, entry->len, entry->va, entry->dma); |
400e64df OBC |
937 | list_del(&entry->node); |
938 | kfree(entry); | |
939 | } | |
940 | ||
941 | /* clean up iommu mapping entries */ | |
942 | list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) { | |
943 | size_t unmapped; | |
944 | ||
945 | unmapped = iommu_unmap(rproc->domain, entry->da, entry->len); | |
946 | if (unmapped != entry->len) { | |
947 | /* nothing much to do besides complaining */ | |
948 | dev_err(dev, "failed to unmap %u/%u\n", entry->len, | |
949 | unmapped); | |
950 | } | |
951 | ||
952 | list_del(&entry->node); | |
953 | kfree(entry); | |
954 | } | |
955 | } | |
956 | ||
957 | /* make sure this fw image is sane */ | |
958 | static int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw) | |
959 | { | |
960 | const char *name = rproc->firmware; | |
b5ab5e24 | 961 | struct device *dev = &rproc->dev; |
400e64df | 962 | struct elf32_hdr *ehdr; |
40b78b2c | 963 | char class; |
400e64df OBC |
964 | |
965 | if (!fw) { | |
966 | dev_err(dev, "failed to load %s\n", name); | |
967 | return -EINVAL; | |
968 | } | |
969 | ||
970 | if (fw->size < sizeof(struct elf32_hdr)) { | |
971 | dev_err(dev, "Image is too small\n"); | |
972 | return -EINVAL; | |
973 | } | |
974 | ||
975 | ehdr = (struct elf32_hdr *)fw->data; | |
976 | ||
40b78b2c OBC |
977 | /* We only support ELF32 at this point */ |
978 | class = ehdr->e_ident[EI_CLASS]; | |
979 | if (class != ELFCLASS32) { | |
980 | dev_err(dev, "Unsupported class: %d\n", class); | |
981 | return -EINVAL; | |
982 | } | |
983 | ||
cf59d3e9 OBC |
984 | /* We assume the firmware has the same endianess as the host */ |
985 | # ifdef __LITTLE_ENDIAN | |
986 | if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) { | |
987 | # else /* BIG ENDIAN */ | |
988 | if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) { | |
989 | # endif | |
990 | dev_err(dev, "Unsupported firmware endianess\n"); | |
991 | return -EINVAL; | |
992 | } | |
993 | ||
9bc91231 OBC |
994 | if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) { |
995 | dev_err(dev, "Image is too small\n"); | |
996 | return -EINVAL; | |
997 | } | |
998 | ||
400e64df OBC |
999 | if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) { |
1000 | dev_err(dev, "Image is corrupted (bad magic)\n"); | |
1001 | return -EINVAL; | |
1002 | } | |
1003 | ||
1004 | if (ehdr->e_phnum == 0) { | |
1005 | dev_err(dev, "No loadable segments\n"); | |
1006 | return -EINVAL; | |
1007 | } | |
1008 | ||
1009 | if (ehdr->e_phoff > fw->size) { | |
1010 | dev_err(dev, "Firmware size is too small\n"); | |
1011 | return -EINVAL; | |
1012 | } | |
1013 | ||
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | * take a firmware and boot a remote processor with it. | |
1019 | */ | |
1020 | static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) | |
1021 | { | |
b5ab5e24 | 1022 | struct device *dev = &rproc->dev; |
400e64df OBC |
1023 | const char *name = rproc->firmware; |
1024 | struct elf32_hdr *ehdr; | |
1e3e2c7c OBC |
1025 | struct resource_table *table; |
1026 | int ret, tablesz; | |
400e64df OBC |
1027 | |
1028 | ret = rproc_fw_sanity_check(rproc, fw); | |
1029 | if (ret) | |
1030 | return ret; | |
1031 | ||
1032 | ehdr = (struct elf32_hdr *)fw->data; | |
1033 | ||
1034 | dev_info(dev, "Booting fw image %s, size %d\n", name, fw->size); | |
1035 | ||
1036 | /* | |
1037 | * if enabling an IOMMU isn't relevant for this rproc, this is | |
1038 | * just a nop | |
1039 | */ | |
1040 | ret = rproc_enable_iommu(rproc); | |
1041 | if (ret) { | |
1042 | dev_err(dev, "can't enable iommu: %d\n", ret); | |
1043 | return ret; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * The ELF entry point is the rproc's boot addr (though this is not | |
1048 | * a configurable property of all remote processors: some will always | |
1049 | * boot at a specific hardcoded address). | |
1050 | */ | |
1051 | rproc->bootaddr = ehdr->e_entry; | |
1052 | ||
1e3e2c7c OBC |
1053 | /* look for the resource table */ |
1054 | table = rproc_find_rsc_table(rproc, fw->data, fw->size, &tablesz); | |
1055 | if (!table) | |
1056 | goto clean_up; | |
1057 | ||
400e64df | 1058 | /* handle fw resources which are required to boot rproc */ |
1e3e2c7c | 1059 | ret = rproc_handle_boot_rsc(rproc, table, tablesz); |
400e64df OBC |
1060 | if (ret) { |
1061 | dev_err(dev, "Failed to process resources: %d\n", ret); | |
1062 | goto clean_up; | |
1063 | } | |
1064 | ||
1065 | /* load the ELF segments to memory */ | |
9bc91231 | 1066 | ret = rproc_load_segments(rproc, fw->data, fw->size); |
400e64df OBC |
1067 | if (ret) { |
1068 | dev_err(dev, "Failed to load program segments: %d\n", ret); | |
1069 | goto clean_up; | |
1070 | } | |
1071 | ||
1072 | /* power up the remote processor */ | |
1073 | ret = rproc->ops->start(rproc); | |
1074 | if (ret) { | |
1075 | dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret); | |
1076 | goto clean_up; | |
1077 | } | |
1078 | ||
1079 | rproc->state = RPROC_RUNNING; | |
1080 | ||
1081 | dev_info(dev, "remote processor %s is now up\n", rproc->name); | |
1082 | ||
1083 | return 0; | |
1084 | ||
1085 | clean_up: | |
1086 | rproc_resource_cleanup(rproc); | |
1087 | rproc_disable_iommu(rproc); | |
1088 | return ret; | |
1089 | } | |
1090 | ||
1091 | /* | |
1092 | * take a firmware and look for virtio devices to register. | |
1093 | * | |
1094 | * Note: this function is called asynchronously upon registration of the | |
1095 | * remote processor (so we must wait until it completes before we try | |
1096 | * to unregister the device. one other option is just to use kref here, | |
1097 | * that might be cleaner). | |
1098 | */ | |
1099 | static void rproc_fw_config_virtio(const struct firmware *fw, void *context) | |
1100 | { | |
1101 | struct rproc *rproc = context; | |
1e3e2c7c OBC |
1102 | struct resource_table *table; |
1103 | int ret, tablesz; | |
400e64df OBC |
1104 | |
1105 | if (rproc_fw_sanity_check(rproc, fw) < 0) | |
1106 | goto out; | |
1107 | ||
1e3e2c7c OBC |
1108 | /* look for the resource table */ |
1109 | table = rproc_find_rsc_table(rproc, fw->data, fw->size, &tablesz); | |
1110 | if (!table) | |
1111 | goto out; | |
1112 | ||
1113 | /* look for virtio devices and register them */ | |
1114 | ret = rproc_handle_virtio_rsc(rproc, table, tablesz); | |
1115 | if (ret) | |
400e64df | 1116 | goto out; |
400e64df | 1117 | |
400e64df | 1118 | out: |
3cc6e787 | 1119 | release_firmware(fw); |
400e64df OBC |
1120 | /* allow rproc_unregister() contexts, if any, to proceed */ |
1121 | complete_all(&rproc->firmware_loading_complete); | |
1122 | } | |
1123 | ||
1124 | /** | |
1125 | * rproc_boot() - boot a remote processor | |
1126 | * @rproc: handle of a remote processor | |
1127 | * | |
1128 | * Boot a remote processor (i.e. load its firmware, power it on, ...). | |
1129 | * | |
1130 | * If the remote processor is already powered on, this function immediately | |
1131 | * returns (successfully). | |
1132 | * | |
1133 | * Returns 0 on success, and an appropriate error value otherwise. | |
1134 | */ | |
1135 | int rproc_boot(struct rproc *rproc) | |
1136 | { | |
1137 | const struct firmware *firmware_p; | |
1138 | struct device *dev; | |
1139 | int ret; | |
1140 | ||
1141 | if (!rproc) { | |
1142 | pr_err("invalid rproc handle\n"); | |
1143 | return -EINVAL; | |
1144 | } | |
1145 | ||
b5ab5e24 | 1146 | dev = &rproc->dev; |
400e64df OBC |
1147 | |
1148 | ret = mutex_lock_interruptible(&rproc->lock); | |
1149 | if (ret) { | |
1150 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); | |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | /* loading a firmware is required */ | |
1155 | if (!rproc->firmware) { | |
1156 | dev_err(dev, "%s: no firmware to load\n", __func__); | |
1157 | ret = -EINVAL; | |
1158 | goto unlock_mutex; | |
1159 | } | |
1160 | ||
1161 | /* prevent underlying implementation from being removed */ | |
b5ab5e24 | 1162 | if (!try_module_get(dev->parent->driver->owner)) { |
400e64df OBC |
1163 | dev_err(dev, "%s: can't get owner\n", __func__); |
1164 | ret = -EINVAL; | |
1165 | goto unlock_mutex; | |
1166 | } | |
1167 | ||
1168 | /* skip the boot process if rproc is already powered up */ | |
1169 | if (atomic_inc_return(&rproc->power) > 1) { | |
1170 | ret = 0; | |
1171 | goto unlock_mutex; | |
1172 | } | |
1173 | ||
1174 | dev_info(dev, "powering up %s\n", rproc->name); | |
1175 | ||
1176 | /* load firmware */ | |
1177 | ret = request_firmware(&firmware_p, rproc->firmware, dev); | |
1178 | if (ret < 0) { | |
1179 | dev_err(dev, "request_firmware failed: %d\n", ret); | |
1180 | goto downref_rproc; | |
1181 | } | |
1182 | ||
1183 | ret = rproc_fw_boot(rproc, firmware_p); | |
1184 | ||
1185 | release_firmware(firmware_p); | |
1186 | ||
1187 | downref_rproc: | |
1188 | if (ret) { | |
b5ab5e24 | 1189 | module_put(dev->parent->driver->owner); |
400e64df OBC |
1190 | atomic_dec(&rproc->power); |
1191 | } | |
1192 | unlock_mutex: | |
1193 | mutex_unlock(&rproc->lock); | |
1194 | return ret; | |
1195 | } | |
1196 | EXPORT_SYMBOL(rproc_boot); | |
1197 | ||
1198 | /** | |
1199 | * rproc_shutdown() - power off the remote processor | |
1200 | * @rproc: the remote processor | |
1201 | * | |
1202 | * Power off a remote processor (previously booted with rproc_boot()). | |
1203 | * | |
1204 | * In case @rproc is still being used by an additional user(s), then | |
1205 | * this function will just decrement the power refcount and exit, | |
1206 | * without really powering off the device. | |
1207 | * | |
1208 | * Every call to rproc_boot() must (eventually) be accompanied by a call | |
1209 | * to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug. | |
1210 | * | |
1211 | * Notes: | |
1212 | * - we're not decrementing the rproc's refcount, only the power refcount. | |
1213 | * which means that the @rproc handle stays valid even after rproc_shutdown() | |
1214 | * returns, and users can still use it with a subsequent rproc_boot(), if | |
1215 | * needed. | |
1216 | * - don't call rproc_shutdown() to unroll rproc_get_by_name(), exactly | |
1217 | * because rproc_shutdown() _does not_ decrement the refcount of @rproc. | |
1218 | * To decrement the refcount of @rproc, use rproc_put() (but _only_ if | |
1219 | * you acquired @rproc using rproc_get_by_name()). | |
1220 | */ | |
1221 | void rproc_shutdown(struct rproc *rproc) | |
1222 | { | |
b5ab5e24 | 1223 | struct device *dev = &rproc->dev; |
400e64df OBC |
1224 | int ret; |
1225 | ||
1226 | ret = mutex_lock_interruptible(&rproc->lock); | |
1227 | if (ret) { | |
1228 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); | |
1229 | return; | |
1230 | } | |
1231 | ||
1232 | /* if the remote proc is still needed, bail out */ | |
1233 | if (!atomic_dec_and_test(&rproc->power)) | |
1234 | goto out; | |
1235 | ||
1236 | /* power off the remote processor */ | |
1237 | ret = rproc->ops->stop(rproc); | |
1238 | if (ret) { | |
1239 | atomic_inc(&rproc->power); | |
1240 | dev_err(dev, "can't stop rproc: %d\n", ret); | |
1241 | goto out; | |
1242 | } | |
1243 | ||
1244 | /* clean up all acquired resources */ | |
1245 | rproc_resource_cleanup(rproc); | |
1246 | ||
1247 | rproc_disable_iommu(rproc); | |
1248 | ||
1249 | rproc->state = RPROC_OFFLINE; | |
1250 | ||
1251 | dev_info(dev, "stopped remote processor %s\n", rproc->name); | |
1252 | ||
1253 | out: | |
1254 | mutex_unlock(&rproc->lock); | |
1255 | if (!ret) | |
b5ab5e24 | 1256 | module_put(dev->parent->driver->owner); |
400e64df OBC |
1257 | } |
1258 | EXPORT_SYMBOL(rproc_shutdown); | |
1259 | ||
1260 | /** | |
1261 | * rproc_release() - completely deletes the existence of a remote processor | |
1262 | * @kref: the rproc's kref | |
1263 | * | |
1264 | * This function should _never_ be called directly. | |
1265 | * | |
1266 | * The only reasonable location to use it is as an argument when kref_put'ing | |
1267 | * @rproc's refcount. | |
1268 | * | |
1269 | * This way it will be called when no one holds a valid pointer to this @rproc | |
1270 | * anymore (and obviously after it is removed from the rprocs klist). | |
1271 | * | |
1272 | * Note: this function is not static because rproc_vdev_release() needs it when | |
1273 | * it decrements @rproc's refcount. | |
1274 | */ | |
1275 | void rproc_release(struct kref *kref) | |
1276 | { | |
1277 | struct rproc *rproc = container_of(kref, struct rproc, refcount); | |
1278 | ||
b5ab5e24 | 1279 | dev_info(&rproc->dev, "removing %s\n", rproc->name); |
400e64df OBC |
1280 | |
1281 | rproc_delete_debug_dir(rproc); | |
1282 | ||
7a186941 OBC |
1283 | /* |
1284 | * At this point no one holds a reference to rproc anymore, | |
1285 | * so we can directly unroll rproc_alloc() | |
1286 | */ | |
1287 | rproc_free(rproc); | |
400e64df OBC |
1288 | } |
1289 | ||
1290 | /* will be called when an rproc is added to the rprocs klist */ | |
1291 | static void klist_rproc_get(struct klist_node *n) | |
1292 | { | |
1293 | struct rproc *rproc = container_of(n, struct rproc, node); | |
1294 | ||
1295 | kref_get(&rproc->refcount); | |
1296 | } | |
1297 | ||
1298 | /* will be called when an rproc is removed from the rprocs klist */ | |
1299 | static void klist_rproc_put(struct klist_node *n) | |
1300 | { | |
1301 | struct rproc *rproc = container_of(n, struct rproc, node); | |
1302 | ||
1303 | kref_put(&rproc->refcount, rproc_release); | |
1304 | } | |
1305 | ||
1306 | static struct rproc *next_rproc(struct klist_iter *i) | |
1307 | { | |
1308 | struct klist_node *n; | |
1309 | ||
1310 | n = klist_next(i); | |
1311 | if (!n) | |
1312 | return NULL; | |
1313 | ||
1314 | return container_of(n, struct rproc, node); | |
1315 | } | |
1316 | ||
1317 | /** | |
1318 | * rproc_get_by_name() - find a remote processor by name and boot it | |
1319 | * @name: name of the remote processor | |
1320 | * | |
1321 | * Finds an rproc handle using the remote processor's name, and then | |
1322 | * boot it. If it's already powered on, then just immediately return | |
1323 | * (successfully). | |
1324 | * | |
1325 | * Returns the rproc handle on success, and NULL on failure. | |
1326 | * | |
1327 | * This function increments the remote processor's refcount, so always | |
1328 | * use rproc_put() to decrement it back once rproc isn't needed anymore. | |
1329 | * | |
1330 | * Note: currently this function (and its counterpart rproc_put()) are not | |
7a186941 | 1331 | * being used. We need to scrutinize the use cases |
400e64df OBC |
1332 | * that still need them, and see if we can migrate them to use the non |
1333 | * name-based boot/shutdown interface. | |
1334 | */ | |
1335 | struct rproc *rproc_get_by_name(const char *name) | |
1336 | { | |
1337 | struct rproc *rproc; | |
1338 | struct klist_iter i; | |
1339 | int ret; | |
1340 | ||
1341 | /* find the remote processor, and upref its refcount */ | |
1342 | klist_iter_init(&rprocs, &i); | |
1343 | while ((rproc = next_rproc(&i)) != NULL) | |
1344 | if (!strcmp(rproc->name, name)) { | |
1345 | kref_get(&rproc->refcount); | |
1346 | break; | |
1347 | } | |
1348 | klist_iter_exit(&i); | |
1349 | ||
1350 | /* can't find this rproc ? */ | |
1351 | if (!rproc) { | |
1352 | pr_err("can't find remote processor %s\n", name); | |
1353 | return NULL; | |
1354 | } | |
1355 | ||
1356 | ret = rproc_boot(rproc); | |
1357 | if (ret < 0) { | |
1358 | kref_put(&rproc->refcount, rproc_release); | |
1359 | return NULL; | |
1360 | } | |
1361 | ||
1362 | return rproc; | |
1363 | } | |
1364 | EXPORT_SYMBOL(rproc_get_by_name); | |
1365 | ||
1366 | /** | |
1367 | * rproc_put() - decrement the refcount of a remote processor, and shut it down | |
1368 | * @rproc: the remote processor | |
1369 | * | |
1370 | * This function tries to shutdown @rproc, and it then decrements its | |
1371 | * refcount. | |
1372 | * | |
1373 | * After this function returns, @rproc may _not_ be used anymore, and its | |
1374 | * handle should be considered invalid. | |
1375 | * | |
1376 | * This function should be called _iff_ the @rproc handle was grabbed by | |
1377 | * calling rproc_get_by_name(). | |
1378 | */ | |
1379 | void rproc_put(struct rproc *rproc) | |
1380 | { | |
1381 | /* try to power off the remote processor */ | |
1382 | rproc_shutdown(rproc); | |
1383 | ||
1384 | /* downref rproc's refcount */ | |
1385 | kref_put(&rproc->refcount, rproc_release); | |
1386 | } | |
1387 | EXPORT_SYMBOL(rproc_put); | |
1388 | ||
1389 | /** | |
1390 | * rproc_register() - register a remote processor | |
1391 | * @rproc: the remote processor handle to register | |
1392 | * | |
1393 | * Registers @rproc with the remoteproc framework, after it has been | |
1394 | * allocated with rproc_alloc(). | |
1395 | * | |
1396 | * This is called by the platform-specific rproc implementation, whenever | |
1397 | * a new remote processor device is probed. | |
1398 | * | |
1399 | * Returns 0 on success and an appropriate error code otherwise. | |
1400 | * | |
1401 | * Note: this function initiates an asynchronous firmware loading | |
1402 | * context, which will look for virtio devices supported by the rproc's | |
1403 | * firmware. | |
1404 | * | |
1405 | * If found, those virtio devices will be created and added, so as a result | |
7a186941 | 1406 | * of registering this remote processor, additional virtio drivers might be |
400e64df | 1407 | * probed. |
400e64df OBC |
1408 | */ |
1409 | int rproc_register(struct rproc *rproc) | |
1410 | { | |
b5ab5e24 | 1411 | struct device *dev = &rproc->dev; |
400e64df OBC |
1412 | int ret = 0; |
1413 | ||
b5ab5e24 OBC |
1414 | ret = device_add(dev); |
1415 | if (ret < 0) | |
1416 | return ret; | |
1417 | ||
400e64df OBC |
1418 | /* expose to rproc_get_by_name users */ |
1419 | klist_add_tail(&rproc->node, &rprocs); | |
1420 | ||
b5ab5e24 | 1421 | dev_info(dev, "%s is available\n", rproc->name); |
400e64df | 1422 | |
489d129a OBC |
1423 | dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n"); |
1424 | dev_info(dev, "THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.\n"); | |
1425 | ||
400e64df OBC |
1426 | /* create debugfs entries */ |
1427 | rproc_create_debug_dir(rproc); | |
1428 | ||
1429 | /* rproc_unregister() calls must wait until async loader completes */ | |
1430 | init_completion(&rproc->firmware_loading_complete); | |
1431 | ||
1432 | /* | |
1433 | * We must retrieve early virtio configuration info from | |
7a186941 | 1434 | * the firmware (e.g. whether to register a virtio device, |
400e64df OBC |
1435 | * what virtio features does it support, ...). |
1436 | * | |
1437 | * We're initiating an asynchronous firmware loading, so we can | |
1438 | * be built-in kernel code, without hanging the boot process. | |
1439 | */ | |
1440 | ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG, | |
1441 | rproc->firmware, dev, GFP_KERNEL, | |
1442 | rproc, rproc_fw_config_virtio); | |
1443 | if (ret < 0) { | |
1444 | dev_err(dev, "request_firmware_nowait failed: %d\n", ret); | |
1445 | complete_all(&rproc->firmware_loading_complete); | |
1446 | klist_remove(&rproc->node); | |
1447 | } | |
1448 | ||
1449 | return ret; | |
1450 | } | |
1451 | EXPORT_SYMBOL(rproc_register); | |
1452 | ||
b5ab5e24 OBC |
1453 | /** |
1454 | * rproc_type_release() - release a remote processor instance | |
1455 | * @dev: the rproc's device | |
1456 | * | |
1457 | * This function should _never_ be called directly. | |
1458 | * | |
1459 | * It will be called by the driver core when no one holds a valid pointer | |
1460 | * to @dev anymore. | |
1461 | */ | |
1462 | static void rproc_type_release(struct device *dev) | |
1463 | { | |
1464 | struct rproc *rproc = container_of(dev, struct rproc, dev); | |
1465 | ||
1466 | idr_remove_all(&rproc->notifyids); | |
1467 | idr_destroy(&rproc->notifyids); | |
1468 | ||
1469 | if (rproc->index >= 0) | |
1470 | ida_simple_remove(&rproc_dev_index, rproc->index); | |
1471 | ||
1472 | kfree(rproc); | |
1473 | } | |
1474 | ||
1475 | static struct device_type rproc_type = { | |
1476 | .name = "remoteproc", | |
1477 | .release = rproc_type_release, | |
1478 | }; | |
1479 | ||
400e64df OBC |
1480 | /** |
1481 | * rproc_alloc() - allocate a remote processor handle | |
1482 | * @dev: the underlying device | |
1483 | * @name: name of this remote processor | |
1484 | * @ops: platform-specific handlers (mainly start/stop) | |
1485 | * @firmware: name of firmware file to load | |
1486 | * @len: length of private data needed by the rproc driver (in bytes) | |
1487 | * | |
1488 | * Allocates a new remote processor handle, but does not register | |
1489 | * it yet. | |
1490 | * | |
1491 | * This function should be used by rproc implementations during initialization | |
1492 | * of the remote processor. | |
1493 | * | |
1494 | * After creating an rproc handle using this function, and when ready, | |
1495 | * implementations should then call rproc_register() to complete | |
1496 | * the registration of the remote processor. | |
1497 | * | |
1498 | * On success the new rproc is returned, and on failure, NULL. | |
1499 | * | |
1500 | * Note: _never_ directly deallocate @rproc, even if it was not registered | |
1501 | * yet. Instead, if you just need to unroll rproc_alloc(), use rproc_free(). | |
1502 | */ | |
1503 | struct rproc *rproc_alloc(struct device *dev, const char *name, | |
1504 | const struct rproc_ops *ops, | |
1505 | const char *firmware, int len) | |
1506 | { | |
1507 | struct rproc *rproc; | |
1508 | ||
1509 | if (!dev || !name || !ops) | |
1510 | return NULL; | |
1511 | ||
1512 | rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL); | |
1513 | if (!rproc) { | |
1514 | dev_err(dev, "%s: kzalloc failed\n", __func__); | |
1515 | return NULL; | |
1516 | } | |
1517 | ||
400e64df OBC |
1518 | rproc->name = name; |
1519 | rproc->ops = ops; | |
1520 | rproc->firmware = firmware; | |
1521 | rproc->priv = &rproc[1]; | |
1522 | ||
b5ab5e24 OBC |
1523 | device_initialize(&rproc->dev); |
1524 | rproc->dev.parent = dev; | |
1525 | rproc->dev.type = &rproc_type; | |
1526 | ||
1527 | /* Assign a unique device index and name */ | |
1528 | rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL); | |
1529 | if (rproc->index < 0) { | |
1530 | dev_err(dev, "ida_simple_get failed: %d\n", rproc->index); | |
1531 | put_device(&rproc->dev); | |
1532 | return NULL; | |
1533 | } | |
1534 | ||
1535 | dev_set_name(&rproc->dev, "remoteproc%d", rproc->index); | |
1536 | ||
400e64df OBC |
1537 | atomic_set(&rproc->power, 0); |
1538 | ||
1539 | kref_init(&rproc->refcount); | |
1540 | ||
1541 | mutex_init(&rproc->lock); | |
1542 | ||
7a186941 OBC |
1543 | idr_init(&rproc->notifyids); |
1544 | ||
400e64df OBC |
1545 | INIT_LIST_HEAD(&rproc->carveouts); |
1546 | INIT_LIST_HEAD(&rproc->mappings); | |
1547 | INIT_LIST_HEAD(&rproc->traces); | |
7a186941 | 1548 | INIT_LIST_HEAD(&rproc->rvdevs); |
400e64df OBC |
1549 | |
1550 | rproc->state = RPROC_OFFLINE; | |
1551 | ||
1552 | return rproc; | |
1553 | } | |
1554 | EXPORT_SYMBOL(rproc_alloc); | |
1555 | ||
1556 | /** | |
1557 | * rproc_free() - free an rproc handle that was allocated by rproc_alloc | |
1558 | * @rproc: the remote processor handle | |
1559 | * | |
1560 | * This function should _only_ be used if @rproc was only allocated, | |
1561 | * but not registered yet. | |
1562 | * | |
1563 | * If @rproc was already successfully registered (by calling rproc_register()), | |
1564 | * then use rproc_unregister() instead. | |
1565 | */ | |
1566 | void rproc_free(struct rproc *rproc) | |
1567 | { | |
b5ab5e24 | 1568 | put_device(&rproc->dev); |
400e64df OBC |
1569 | } |
1570 | EXPORT_SYMBOL(rproc_free); | |
1571 | ||
1572 | /** | |
1573 | * rproc_unregister() - unregister a remote processor | |
1574 | * @rproc: rproc handle to unregister | |
1575 | * | |
1576 | * Unregisters a remote processor, and decrements its refcount. | |
1577 | * If its refcount drops to zero, then @rproc will be freed. If not, | |
1578 | * it will be freed later once the last reference is dropped. | |
1579 | * | |
1580 | * This function should be called when the platform specific rproc | |
1581 | * implementation decides to remove the rproc device. it should | |
1582 | * _only_ be called if a previous invocation of rproc_register() | |
1583 | * has completed successfully. | |
1584 | * | |
1585 | * After rproc_unregister() returns, @rproc is _not_ valid anymore and | |
1586 | * it shouldn't be used. More specifically, don't call rproc_free() | |
1587 | * or try to directly free @rproc after rproc_unregister() returns; | |
1588 | * none of these are needed, and calling them is a bug. | |
1589 | * | |
1590 | * Returns 0 on success and -EINVAL if @rproc isn't valid. | |
1591 | */ | |
1592 | int rproc_unregister(struct rproc *rproc) | |
1593 | { | |
6db20ea8 | 1594 | struct rproc_vdev *rvdev, *tmp; |
7a186941 | 1595 | |
400e64df OBC |
1596 | if (!rproc) |
1597 | return -EINVAL; | |
1598 | ||
1599 | /* if rproc is just being registered, wait */ | |
1600 | wait_for_completion(&rproc->firmware_loading_complete); | |
1601 | ||
7a186941 | 1602 | /* clean up remote vdev entries */ |
6db20ea8 | 1603 | list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node) |
7a186941 | 1604 | rproc_remove_virtio_dev(rvdev); |
400e64df | 1605 | |
7a186941 OBC |
1606 | /* the rproc is downref'ed as soon as it's removed from the klist */ |
1607 | klist_del(&rproc->node); | |
400e64df | 1608 | |
b5ab5e24 OBC |
1609 | device_del(&rproc->dev); |
1610 | ||
7a186941 | 1611 | /* the rproc will only be released after its refcount drops to zero */ |
400e64df OBC |
1612 | kref_put(&rproc->refcount, rproc_release); |
1613 | ||
1614 | return 0; | |
1615 | } | |
1616 | EXPORT_SYMBOL(rproc_unregister); | |
1617 | ||
1618 | static int __init remoteproc_init(void) | |
1619 | { | |
1620 | rproc_init_debugfs(); | |
b5ab5e24 | 1621 | |
400e64df OBC |
1622 | return 0; |
1623 | } | |
1624 | module_init(remoteproc_init); | |
1625 | ||
1626 | static void __exit remoteproc_exit(void) | |
1627 | { | |
1628 | rproc_exit_debugfs(); | |
1629 | } | |
1630 | module_exit(remoteproc_exit); | |
1631 | ||
1632 | MODULE_LICENSE("GPL v2"); | |
1633 | MODULE_DESCRIPTION("Generic Remote Processor Framework"); |