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 | 39 | #include <linux/elf.h> |
a2b950ac | 40 | #include <linux/crc32.h> |
400e64df OBC |
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 | ||
fec47d86 DG |
47 | static DEFINE_MUTEX(rproc_list_mutex); |
48 | static LIST_HEAD(rproc_list); | |
49 | ||
400e64df | 50 | typedef int (*rproc_handle_resources_t)(struct rproc *rproc, |
fd2c15ec | 51 | struct resource_table *table, int len); |
a2b950ac OBC |
52 | typedef int (*rproc_handle_resource_t)(struct rproc *rproc, |
53 | void *, int offset, int avail); | |
400e64df | 54 | |
b5ab5e24 OBC |
55 | /* Unique indices for remoteproc devices */ |
56 | static DEFINE_IDA(rproc_dev_index); | |
57 | ||
8afd519c FGL |
58 | static const char * const rproc_crash_names[] = { |
59 | [RPROC_MMUFAULT] = "mmufault", | |
b3d39032 BA |
60 | [RPROC_WATCHDOG] = "watchdog", |
61 | [RPROC_FATAL_ERROR] = "fatal error", | |
8afd519c FGL |
62 | }; |
63 | ||
64 | /* translate rproc_crash_type to string */ | |
65 | static const char *rproc_crash_to_string(enum rproc_crash_type type) | |
66 | { | |
67 | if (type < ARRAY_SIZE(rproc_crash_names)) | |
68 | return rproc_crash_names[type]; | |
b23f7a09 | 69 | return "unknown"; |
8afd519c FGL |
70 | } |
71 | ||
400e64df OBC |
72 | /* |
73 | * This is the IOMMU fault handler we register with the IOMMU API | |
74 | * (when relevant; not all remote processors access memory through | |
75 | * an IOMMU). | |
76 | * | |
77 | * IOMMU core will invoke this handler whenever the remote processor | |
78 | * will try to access an unmapped device address. | |
400e64df OBC |
79 | */ |
80 | static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
730f84ce | 81 | unsigned long iova, int flags, void *token) |
400e64df | 82 | { |
8afd519c FGL |
83 | struct rproc *rproc = token; |
84 | ||
400e64df OBC |
85 | dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags); |
86 | ||
8afd519c FGL |
87 | rproc_report_crash(rproc, RPROC_MMUFAULT); |
88 | ||
400e64df OBC |
89 | /* |
90 | * Let the iommu core know we're not really handling this fault; | |
8afd519c | 91 | * we just used it as a recovery trigger. |
400e64df OBC |
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 | ||
315491e5 SA |
102 | if (!rproc->has_iommu) { |
103 | dev_dbg(dev, "iommu not present\n"); | |
0798e1da | 104 | return 0; |
400e64df OBC |
105 | } |
106 | ||
107 | domain = iommu_domain_alloc(dev->bus); | |
108 | if (!domain) { | |
109 | dev_err(dev, "can't alloc iommu domain\n"); | |
110 | return -ENOMEM; | |
111 | } | |
112 | ||
77ca2332 | 113 | iommu_set_fault_handler(domain, rproc_iommu_fault, rproc); |
400e64df OBC |
114 | |
115 | ret = iommu_attach_device(domain, dev); | |
116 | if (ret) { | |
117 | dev_err(dev, "can't attach iommu device: %d\n", ret); | |
118 | goto free_domain; | |
119 | } | |
120 | ||
121 | rproc->domain = domain; | |
122 | ||
123 | return 0; | |
124 | ||
125 | free_domain: | |
126 | iommu_domain_free(domain); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | static void rproc_disable_iommu(struct rproc *rproc) | |
131 | { | |
132 | struct iommu_domain *domain = rproc->domain; | |
b5ab5e24 | 133 | struct device *dev = rproc->dev.parent; |
400e64df OBC |
134 | |
135 | if (!domain) | |
136 | return; | |
137 | ||
138 | iommu_detach_device(domain, dev); | |
139 | iommu_domain_free(domain); | |
400e64df OBC |
140 | } |
141 | ||
a01f7cd6 SA |
142 | /** |
143 | * rproc_da_to_va() - lookup the kernel virtual address for a remoteproc address | |
144 | * @rproc: handle of a remote processor | |
145 | * @da: remoteproc device address to translate | |
146 | * @len: length of the memory region @da is pointing to | |
147 | * | |
400e64df OBC |
148 | * Some remote processors will ask us to allocate them physically contiguous |
149 | * memory regions (which we call "carveouts"), and map them to specific | |
a01f7cd6 SA |
150 | * device addresses (which are hardcoded in the firmware). They may also have |
151 | * dedicated memory regions internal to the processors, and use them either | |
152 | * exclusively or alongside carveouts. | |
400e64df OBC |
153 | * |
154 | * They may then ask us to copy objects into specific device addresses (e.g. | |
155 | * code/data sections) or expose us certain symbols in other device address | |
156 | * (e.g. their trace buffer). | |
157 | * | |
a01f7cd6 SA |
158 | * This function is a helper function with which we can go over the allocated |
159 | * carveouts and translate specific device addresses to kernel virtual addresses | |
160 | * so we can access the referenced memory. This function also allows to perform | |
161 | * translations on the internal remoteproc memory regions through a platform | |
162 | * implementation specific da_to_va ops, if present. | |
163 | * | |
164 | * The function returns a valid kernel address on success or NULL on failure. | |
400e64df OBC |
165 | * |
166 | * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too, | |
167 | * but only on kernel direct mapped RAM memory. Instead, we're just using | |
a01f7cd6 SA |
168 | * here the output of the DMA API for the carveouts, which should be more |
169 | * correct. | |
400e64df | 170 | */ |
72854fb0 | 171 | void *rproc_da_to_va(struct rproc *rproc, u64 da, int len) |
400e64df OBC |
172 | { |
173 | struct rproc_mem_entry *carveout; | |
174 | void *ptr = NULL; | |
175 | ||
a01f7cd6 SA |
176 | if (rproc->ops->da_to_va) { |
177 | ptr = rproc->ops->da_to_va(rproc, da, len); | |
178 | if (ptr) | |
179 | goto out; | |
180 | } | |
181 | ||
400e64df OBC |
182 | list_for_each_entry(carveout, &rproc->carveouts, node) { |
183 | int offset = da - carveout->da; | |
184 | ||
185 | /* try next carveout if da is too small */ | |
186 | if (offset < 0) | |
187 | continue; | |
188 | ||
189 | /* try next carveout if da is too large */ | |
190 | if (offset + len > carveout->len) | |
191 | continue; | |
192 | ||
193 | ptr = carveout->va + offset; | |
194 | ||
195 | break; | |
196 | } | |
197 | ||
a01f7cd6 | 198 | out: |
400e64df OBC |
199 | return ptr; |
200 | } | |
4afc89d6 | 201 | EXPORT_SYMBOL(rproc_da_to_va); |
400e64df | 202 | |
6db20ea8 | 203 | int rproc_alloc_vring(struct rproc_vdev *rvdev, int i) |
400e64df | 204 | { |
7a186941 | 205 | struct rproc *rproc = rvdev->rproc; |
b5ab5e24 | 206 | struct device *dev = &rproc->dev; |
6db20ea8 | 207 | struct rproc_vring *rvring = &rvdev->vring[i]; |
c0d63157 | 208 | struct fw_rsc_vdev *rsc; |
7a186941 OBC |
209 | dma_addr_t dma; |
210 | void *va; | |
211 | int ret, size, notifyid; | |
400e64df | 212 | |
7a186941 | 213 | /* actual size of vring (in bytes) */ |
6db20ea8 | 214 | size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); |
7a186941 | 215 | |
7a186941 OBC |
216 | /* |
217 | * Allocate non-cacheable memory for the vring. In the future | |
218 | * this call will also configure the IOMMU for us | |
219 | */ | |
b5ab5e24 | 220 | va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL); |
7a186941 | 221 | if (!va) { |
b5ab5e24 | 222 | dev_err(dev->parent, "dma_alloc_coherent failed\n"); |
400e64df OBC |
223 | return -EINVAL; |
224 | } | |
225 | ||
6db20ea8 OBC |
226 | /* |
227 | * Assign an rproc-wide unique index for this vring | |
228 | * TODO: assign a notifyid for rvdev updates as well | |
6db20ea8 OBC |
229 | * TODO: support predefined notifyids (via resource table) |
230 | */ | |
15fc6110 | 231 | ret = idr_alloc(&rproc->notifyids, rvring, 0, 0, GFP_KERNEL); |
b39599b7 | 232 | if (ret < 0) { |
15fc6110 | 233 | dev_err(dev, "idr_alloc failed: %d\n", ret); |
b5ab5e24 | 234 | dma_free_coherent(dev->parent, size, va, dma); |
7a186941 OBC |
235 | return ret; |
236 | } | |
15fc6110 | 237 | notifyid = ret; |
400e64df | 238 | |
9d7814a9 | 239 | dev_dbg(dev, "vring%d: va %p dma %pad size 0x%x idr %d\n", |
b605ed8b | 240 | i, va, &dma, size, notifyid); |
7a186941 | 241 | |
6db20ea8 OBC |
242 | rvring->va = va; |
243 | rvring->dma = dma; | |
244 | rvring->notifyid = notifyid; | |
400e64df | 245 | |
c0d63157 SB |
246 | /* |
247 | * Let the rproc know the notifyid and da of this vring. | |
248 | * Not all platforms use dma_alloc_coherent to automatically | |
249 | * set up the iommu. In this case the device address (da) will | |
250 | * hold the physical address and not the device address. | |
251 | */ | |
252 | rsc = (void *)rproc->table_ptr + rvdev->rsc_offset; | |
253 | rsc->vring[i].da = dma; | |
254 | rsc->vring[i].notifyid = notifyid; | |
400e64df OBC |
255 | return 0; |
256 | } | |
257 | ||
6db20ea8 OBC |
258 | static int |
259 | rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i) | |
7a186941 OBC |
260 | { |
261 | struct rproc *rproc = rvdev->rproc; | |
b5ab5e24 | 262 | struct device *dev = &rproc->dev; |
6db20ea8 OBC |
263 | struct fw_rsc_vdev_vring *vring = &rsc->vring[i]; |
264 | struct rproc_vring *rvring = &rvdev->vring[i]; | |
7a186941 | 265 | |
9d7814a9 | 266 | dev_dbg(dev, "vdev rsc: vring%d: da 0x%x, qsz %d, align %d\n", |
730f84ce | 267 | i, vring->da, vring->num, vring->align); |
7a186941 | 268 | |
6db20ea8 OBC |
269 | /* verify queue size and vring alignment are sane */ |
270 | if (!vring->num || !vring->align) { | |
271 | dev_err(dev, "invalid qsz (%d) or alignment (%d)\n", | |
730f84ce | 272 | vring->num, vring->align); |
6db20ea8 | 273 | return -EINVAL; |
7a186941 | 274 | } |
6db20ea8 OBC |
275 | |
276 | rvring->len = vring->num; | |
277 | rvring->align = vring->align; | |
278 | rvring->rvdev = rvdev; | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | void rproc_free_vring(struct rproc_vring *rvring) | |
284 | { | |
285 | int size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); | |
286 | struct rproc *rproc = rvring->rvdev->rproc; | |
c0d63157 SB |
287 | int idx = rvring->rvdev->vring - rvring; |
288 | struct fw_rsc_vdev *rsc; | |
6db20ea8 | 289 | |
b5ab5e24 | 290 | dma_free_coherent(rproc->dev.parent, size, rvring->va, rvring->dma); |
6db20ea8 | 291 | idr_remove(&rproc->notifyids, rvring->notifyid); |
099a3f33 | 292 | |
c0d63157 SB |
293 | /* reset resource entry info */ |
294 | rsc = (void *)rproc->table_ptr + rvring->rvdev->rsc_offset; | |
295 | rsc->vring[idx].da = 0; | |
296 | rsc->vring[idx].notifyid = -1; | |
7a186941 OBC |
297 | } |
298 | ||
400e64df | 299 | /** |
fd2c15ec | 300 | * rproc_handle_vdev() - handle a vdev fw resource |
400e64df OBC |
301 | * @rproc: the remote processor |
302 | * @rsc: the vring resource descriptor | |
fd2c15ec | 303 | * @avail: size of available data (for sanity checking the image) |
400e64df | 304 | * |
7a186941 OBC |
305 | * This resource entry requests the host to statically register a virtio |
306 | * device (vdev), and setup everything needed to support it. It contains | |
307 | * everything needed to make it possible: the virtio device id, virtio | |
308 | * device features, vrings information, virtio config space, etc... | |
309 | * | |
310 | * Before registering the vdev, the vrings are allocated from non-cacheable | |
311 | * physically contiguous memory. Currently we only support two vrings per | |
312 | * remote processor (temporary limitation). We might also want to consider | |
313 | * doing the vring allocation only later when ->find_vqs() is invoked, and | |
314 | * then release them upon ->del_vqs(). | |
315 | * | |
316 | * Note: @da is currently not really handled correctly: we dynamically | |
317 | * allocate it using the DMA API, ignoring requested hard coded addresses, | |
318 | * and we don't take care of any required IOMMU programming. This is all | |
319 | * going to be taken care of when the generic iommu-based DMA API will be | |
320 | * merged. Meanwhile, statically-addressed iommu-based firmware images should | |
321 | * use RSC_DEVMEM resource entries to map their required @da to the physical | |
322 | * address of their base CMA region (ouch, hacky!). | |
400e64df OBC |
323 | * |
324 | * Returns 0 on success, or an appropriate error code otherwise | |
325 | */ | |
fd2c15ec | 326 | static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, |
730f84ce | 327 | int offset, int avail) |
400e64df | 328 | { |
b5ab5e24 | 329 | struct device *dev = &rproc->dev; |
7a186941 OBC |
330 | struct rproc_vdev *rvdev; |
331 | int i, ret; | |
400e64df | 332 | |
fd2c15ec OBC |
333 | /* make sure resource isn't truncated */ |
334 | if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring) | |
335 | + rsc->config_len > avail) { | |
b5ab5e24 | 336 | dev_err(dev, "vdev rsc is truncated\n"); |
400e64df OBC |
337 | return -EINVAL; |
338 | } | |
339 | ||
fd2c15ec OBC |
340 | /* make sure reserved bytes are zeroes */ |
341 | if (rsc->reserved[0] || rsc->reserved[1]) { | |
342 | dev_err(dev, "vdev rsc has non zero reserved bytes\n"); | |
400e64df OBC |
343 | return -EINVAL; |
344 | } | |
345 | ||
9d7814a9 | 346 | dev_dbg(dev, "vdev rsc: id %d, dfeatures 0x%x, cfg len %d, %d vrings\n", |
fd2c15ec OBC |
347 | rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings); |
348 | ||
7a186941 OBC |
349 | /* we currently support only two vrings per rvdev */ |
350 | if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) { | |
fd2c15ec | 351 | dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings); |
400e64df OBC |
352 | return -EINVAL; |
353 | } | |
354 | ||
899585ad | 355 | rvdev = kzalloc(sizeof(*rvdev), GFP_KERNEL); |
7a186941 OBC |
356 | if (!rvdev) |
357 | return -ENOMEM; | |
400e64df | 358 | |
aab8d802 BA |
359 | kref_init(&rvdev->refcount); |
360 | ||
7a186941 | 361 | rvdev->rproc = rproc; |
400e64df | 362 | |
6db20ea8 | 363 | /* parse the vrings */ |
7a186941 | 364 | for (i = 0; i < rsc->num_of_vrings; i++) { |
6db20ea8 | 365 | ret = rproc_parse_vring(rvdev, rsc, i); |
7a186941 | 366 | if (ret) |
6db20ea8 | 367 | goto free_rvdev; |
7a186941 | 368 | } |
400e64df | 369 | |
a2b950ac OBC |
370 | /* remember the resource offset*/ |
371 | rvdev->rsc_offset = offset; | |
fd2c15ec | 372 | |
a863af5d BA |
373 | /* allocate the vring resources */ |
374 | for (i = 0; i < rsc->num_of_vrings; i++) { | |
375 | ret = rproc_alloc_vring(rvdev, i); | |
376 | if (ret) | |
377 | goto unwind_vring_allocations; | |
378 | } | |
379 | ||
7a186941 | 380 | list_add_tail(&rvdev->node, &rproc->rvdevs); |
fd2c15ec | 381 | |
7a186941 OBC |
382 | /* it is now safe to add the virtio device */ |
383 | ret = rproc_add_virtio_dev(rvdev, rsc->id); | |
384 | if (ret) | |
cde42e07 | 385 | goto remove_rvdev; |
400e64df OBC |
386 | |
387 | return 0; | |
7a186941 | 388 | |
a863af5d BA |
389 | unwind_vring_allocations: |
390 | for (i--; i >= 0; i--) | |
391 | rproc_free_vring(&rvdev->vring[i]); | |
cde42e07 SB |
392 | remove_rvdev: |
393 | list_del(&rvdev->node); | |
6db20ea8 | 394 | free_rvdev: |
7a186941 OBC |
395 | kfree(rvdev); |
396 | return ret; | |
400e64df OBC |
397 | } |
398 | ||
aab8d802 BA |
399 | void rproc_vdev_release(struct kref *ref) |
400 | { | |
401 | struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount); | |
a863af5d BA |
402 | struct rproc_vring *rvring; |
403 | int id; | |
404 | ||
405 | for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) { | |
406 | rvring = &rvdev->vring[id]; | |
407 | if (!rvring->va) | |
408 | continue; | |
409 | ||
410 | rproc_free_vring(rvring); | |
411 | } | |
aab8d802 BA |
412 | |
413 | list_del(&rvdev->node); | |
414 | kfree(rvdev); | |
415 | } | |
416 | ||
400e64df OBC |
417 | /** |
418 | * rproc_handle_trace() - handle a shared trace buffer resource | |
419 | * @rproc: the remote processor | |
420 | * @rsc: the trace resource descriptor | |
fd2c15ec | 421 | * @avail: size of available data (for sanity checking the image) |
400e64df OBC |
422 | * |
423 | * In case the remote processor dumps trace logs into memory, | |
424 | * export it via debugfs. | |
425 | * | |
426 | * Currently, the 'da' member of @rsc should contain the device address | |
427 | * where the remote processor is dumping the traces. Later we could also | |
428 | * support dynamically allocating this address using the generic | |
429 | * DMA API (but currently there isn't a use case for that). | |
430 | * | |
431 | * Returns 0 on success, or an appropriate error code otherwise | |
432 | */ | |
fd2c15ec | 433 | static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc, |
730f84ce | 434 | int offset, int avail) |
400e64df OBC |
435 | { |
436 | struct rproc_mem_entry *trace; | |
b5ab5e24 | 437 | struct device *dev = &rproc->dev; |
400e64df OBC |
438 | void *ptr; |
439 | char name[15]; | |
440 | ||
fd2c15ec | 441 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 442 | dev_err(dev, "trace rsc is truncated\n"); |
fd2c15ec OBC |
443 | return -EINVAL; |
444 | } | |
445 | ||
446 | /* make sure reserved bytes are zeroes */ | |
447 | if (rsc->reserved) { | |
448 | dev_err(dev, "trace rsc has non zero reserved bytes\n"); | |
449 | return -EINVAL; | |
450 | } | |
451 | ||
400e64df OBC |
452 | /* what's the kernel address of this resource ? */ |
453 | ptr = rproc_da_to_va(rproc, rsc->da, rsc->len); | |
454 | if (!ptr) { | |
455 | dev_err(dev, "erroneous trace resource entry\n"); | |
456 | return -EINVAL; | |
457 | } | |
458 | ||
459 | trace = kzalloc(sizeof(*trace), GFP_KERNEL); | |
172e6ab1 | 460 | if (!trace) |
400e64df | 461 | return -ENOMEM; |
400e64df OBC |
462 | |
463 | /* set the trace buffer dma properties */ | |
464 | trace->len = rsc->len; | |
465 | trace->va = ptr; | |
466 | ||
467 | /* make sure snprintf always null terminates, even if truncating */ | |
468 | snprintf(name, sizeof(name), "trace%d", rproc->num_traces); | |
469 | ||
470 | /* create the debugfs entry */ | |
471 | trace->priv = rproc_create_trace_file(name, rproc, trace); | |
472 | if (!trace->priv) { | |
473 | trace->va = NULL; | |
474 | kfree(trace); | |
475 | return -EINVAL; | |
476 | } | |
477 | ||
478 | list_add_tail(&trace->node, &rproc->traces); | |
479 | ||
480 | rproc->num_traces++; | |
481 | ||
35386166 LJ |
482 | dev_dbg(dev, "%s added: va %p, da 0x%x, len 0x%x\n", |
483 | name, ptr, rsc->da, rsc->len); | |
400e64df OBC |
484 | |
485 | return 0; | |
486 | } | |
487 | ||
488 | /** | |
489 | * rproc_handle_devmem() - handle devmem resource entry | |
490 | * @rproc: remote processor handle | |
491 | * @rsc: the devmem resource entry | |
fd2c15ec | 492 | * @avail: size of available data (for sanity checking the image) |
400e64df OBC |
493 | * |
494 | * Remote processors commonly need to access certain on-chip peripherals. | |
495 | * | |
496 | * Some of these remote processors access memory via an iommu device, | |
497 | * and might require us to configure their iommu before they can access | |
498 | * the on-chip peripherals they need. | |
499 | * | |
500 | * This resource entry is a request to map such a peripheral device. | |
501 | * | |
502 | * These devmem entries will contain the physical address of the device in | |
503 | * the 'pa' member. If a specific device address is expected, then 'da' will | |
504 | * contain it (currently this is the only use case supported). 'len' will | |
505 | * contain the size of the physical region we need to map. | |
506 | * | |
507 | * Currently we just "trust" those devmem entries to contain valid physical | |
508 | * addresses, but this is going to change: we want the implementations to | |
509 | * tell us ranges of physical addresses the firmware is allowed to request, | |
510 | * and not allow firmwares to request access to physical addresses that | |
511 | * are outside those ranges. | |
512 | */ | |
fd2c15ec | 513 | static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc, |
730f84ce | 514 | int offset, int avail) |
400e64df OBC |
515 | { |
516 | struct rproc_mem_entry *mapping; | |
b5ab5e24 | 517 | struct device *dev = &rproc->dev; |
400e64df OBC |
518 | int ret; |
519 | ||
520 | /* no point in handling this resource without a valid iommu domain */ | |
521 | if (!rproc->domain) | |
522 | return -EINVAL; | |
523 | ||
fd2c15ec | 524 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 525 | dev_err(dev, "devmem rsc is truncated\n"); |
fd2c15ec OBC |
526 | return -EINVAL; |
527 | } | |
528 | ||
529 | /* make sure reserved bytes are zeroes */ | |
530 | if (rsc->reserved) { | |
b5ab5e24 | 531 | dev_err(dev, "devmem rsc has non zero reserved bytes\n"); |
fd2c15ec OBC |
532 | return -EINVAL; |
533 | } | |
534 | ||
400e64df | 535 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); |
172e6ab1 | 536 | if (!mapping) |
400e64df | 537 | return -ENOMEM; |
400e64df OBC |
538 | |
539 | ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags); | |
540 | if (ret) { | |
b5ab5e24 | 541 | dev_err(dev, "failed to map devmem: %d\n", ret); |
400e64df OBC |
542 | goto out; |
543 | } | |
544 | ||
545 | /* | |
546 | * We'll need this info later when we'll want to unmap everything | |
547 | * (e.g. on shutdown). | |
548 | * | |
549 | * We can't trust the remote processor not to change the resource | |
550 | * table, so we must maintain this info independently. | |
551 | */ | |
552 | mapping->da = rsc->da; | |
553 | mapping->len = rsc->len; | |
554 | list_add_tail(&mapping->node, &rproc->mappings); | |
555 | ||
b5ab5e24 | 556 | dev_dbg(dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n", |
730f84ce | 557 | rsc->pa, rsc->da, rsc->len); |
400e64df OBC |
558 | |
559 | return 0; | |
560 | ||
561 | out: | |
562 | kfree(mapping); | |
563 | return ret; | |
564 | } | |
565 | ||
566 | /** | |
567 | * rproc_handle_carveout() - handle phys contig memory allocation requests | |
568 | * @rproc: rproc handle | |
569 | * @rsc: the resource entry | |
fd2c15ec | 570 | * @avail: size of available data (for image validation) |
400e64df OBC |
571 | * |
572 | * This function will handle firmware requests for allocation of physically | |
573 | * contiguous memory regions. | |
574 | * | |
575 | * These request entries should come first in the firmware's resource table, | |
576 | * as other firmware entries might request placing other data objects inside | |
577 | * these memory regions (e.g. data/code segments, trace resource entries, ...). | |
578 | * | |
579 | * Allocating memory this way helps utilizing the reserved physical memory | |
580 | * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries | |
581 | * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB | |
582 | * pressure is important; it may have a substantial impact on performance. | |
583 | */ | |
fd2c15ec | 584 | static int rproc_handle_carveout(struct rproc *rproc, |
730f84ce AS |
585 | struct fw_rsc_carveout *rsc, |
586 | int offset, int avail) | |
400e64df OBC |
587 | { |
588 | struct rproc_mem_entry *carveout, *mapping; | |
b5ab5e24 | 589 | struct device *dev = &rproc->dev; |
400e64df OBC |
590 | dma_addr_t dma; |
591 | void *va; | |
592 | int ret; | |
593 | ||
fd2c15ec | 594 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 595 | dev_err(dev, "carveout rsc is truncated\n"); |
fd2c15ec OBC |
596 | return -EINVAL; |
597 | } | |
598 | ||
599 | /* make sure reserved bytes are zeroes */ | |
600 | if (rsc->reserved) { | |
601 | dev_err(dev, "carveout rsc has non zero reserved bytes\n"); | |
602 | return -EINVAL; | |
603 | } | |
604 | ||
9d7814a9 | 605 | dev_dbg(dev, "carveout rsc: name: %s, da 0x%x, pa 0x%x, len 0x%x, flags 0x%x\n", |
35386166 | 606 | rsc->name, rsc->da, rsc->pa, rsc->len, rsc->flags); |
fd2c15ec | 607 | |
400e64df | 608 | carveout = kzalloc(sizeof(*carveout), GFP_KERNEL); |
172e6ab1 | 609 | if (!carveout) |
7168d914 | 610 | return -ENOMEM; |
400e64df | 611 | |
b5ab5e24 | 612 | va = dma_alloc_coherent(dev->parent, rsc->len, &dma, GFP_KERNEL); |
400e64df | 613 | if (!va) { |
9c219b23 LJ |
614 | dev_err(dev->parent, |
615 | "failed to allocate dma memory: len 0x%x\n", rsc->len); | |
400e64df OBC |
616 | ret = -ENOMEM; |
617 | goto free_carv; | |
618 | } | |
619 | ||
b605ed8b AS |
620 | dev_dbg(dev, "carveout va %p, dma %pad, len 0x%x\n", |
621 | va, &dma, rsc->len); | |
400e64df OBC |
622 | |
623 | /* | |
624 | * Ok, this is non-standard. | |
625 | * | |
626 | * Sometimes we can't rely on the generic iommu-based DMA API | |
627 | * to dynamically allocate the device address and then set the IOMMU | |
628 | * tables accordingly, because some remote processors might | |
629 | * _require_ us to use hard coded device addresses that their | |
630 | * firmware was compiled with. | |
631 | * | |
632 | * In this case, we must use the IOMMU API directly and map | |
633 | * the memory to the device address as expected by the remote | |
634 | * processor. | |
635 | * | |
636 | * Obviously such remote processor devices should not be configured | |
637 | * to use the iommu-based DMA API: we expect 'dma' to contain the | |
638 | * physical address in this case. | |
639 | */ | |
640 | if (rproc->domain) { | |
7168d914 DC |
641 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); |
642 | if (!mapping) { | |
7168d914 DC |
643 | ret = -ENOMEM; |
644 | goto dma_free; | |
645 | } | |
646 | ||
400e64df | 647 | ret = iommu_map(rproc->domain, rsc->da, dma, rsc->len, |
730f84ce | 648 | rsc->flags); |
400e64df OBC |
649 | if (ret) { |
650 | dev_err(dev, "iommu_map failed: %d\n", ret); | |
7168d914 | 651 | goto free_mapping; |
400e64df OBC |
652 | } |
653 | ||
654 | /* | |
655 | * We'll need this info later when we'll want to unmap | |
656 | * everything (e.g. on shutdown). | |
657 | * | |
658 | * We can't trust the remote processor not to change the | |
659 | * resource table, so we must maintain this info independently. | |
660 | */ | |
661 | mapping->da = rsc->da; | |
662 | mapping->len = rsc->len; | |
663 | list_add_tail(&mapping->node, &rproc->mappings); | |
664 | ||
b605ed8b AS |
665 | dev_dbg(dev, "carveout mapped 0x%x to %pad\n", |
666 | rsc->da, &dma); | |
400e64df OBC |
667 | } |
668 | ||
0e49b72c OBC |
669 | /* |
670 | * Some remote processors might need to know the pa | |
671 | * even though they are behind an IOMMU. E.g., OMAP4's | |
672 | * remote M3 processor needs this so it can control | |
673 | * on-chip hardware accelerators that are not behind | |
674 | * the IOMMU, and therefor must know the pa. | |
675 | * | |
676 | * Generally we don't want to expose physical addresses | |
677 | * if we don't have to (remote processors are generally | |
678 | * _not_ trusted), so we might want to do this only for | |
679 | * remote processor that _must_ have this (e.g. OMAP4's | |
680 | * dual M3 subsystem). | |
681 | * | |
682 | * Non-IOMMU processors might also want to have this info. | |
683 | * In this case, the device address and the physical address | |
684 | * are the same. | |
685 | */ | |
686 | rsc->pa = dma; | |
687 | ||
400e64df OBC |
688 | carveout->va = va; |
689 | carveout->len = rsc->len; | |
690 | carveout->dma = dma; | |
691 | carveout->da = rsc->da; | |
692 | ||
693 | list_add_tail(&carveout->node, &rproc->carveouts); | |
694 | ||
695 | return 0; | |
696 | ||
7168d914 DC |
697 | free_mapping: |
698 | kfree(mapping); | |
400e64df | 699 | dma_free: |
b5ab5e24 | 700 | dma_free_coherent(dev->parent, rsc->len, va, dma); |
400e64df OBC |
701 | free_carv: |
702 | kfree(carveout); | |
400e64df OBC |
703 | return ret; |
704 | } | |
705 | ||
ba7290e0 | 706 | static int rproc_count_vrings(struct rproc *rproc, struct fw_rsc_vdev *rsc, |
a2b950ac | 707 | int offset, int avail) |
ba7290e0 SB |
708 | { |
709 | /* Summarize the number of notification IDs */ | |
710 | rproc->max_notifyid += rsc->num_of_vrings; | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
e12bc14b OBC |
715 | /* |
716 | * A lookup table for resource handlers. The indices are defined in | |
717 | * enum fw_resource_type. | |
718 | */ | |
232fcdbb | 719 | static rproc_handle_resource_t rproc_loading_handlers[RSC_LAST] = { |
fd2c15ec OBC |
720 | [RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout, |
721 | [RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem, | |
722 | [RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace, | |
b35d7afc | 723 | [RSC_VDEV] = (rproc_handle_resource_t)rproc_count_vrings, |
e12bc14b OBC |
724 | }; |
725 | ||
232fcdbb SB |
726 | static rproc_handle_resource_t rproc_vdev_handler[RSC_LAST] = { |
727 | [RSC_VDEV] = (rproc_handle_resource_t)rproc_handle_vdev, | |
728 | }; | |
729 | ||
400e64df | 730 | /* handle firmware resource entries before booting the remote processor */ |
a2b950ac | 731 | static int rproc_handle_resources(struct rproc *rproc, int len, |
232fcdbb | 732 | rproc_handle_resource_t handlers[RSC_LAST]) |
400e64df | 733 | { |
b5ab5e24 | 734 | struct device *dev = &rproc->dev; |
e12bc14b | 735 | rproc_handle_resource_t handler; |
fd2c15ec OBC |
736 | int ret = 0, i; |
737 | ||
a2b950ac OBC |
738 | for (i = 0; i < rproc->table_ptr->num; i++) { |
739 | int offset = rproc->table_ptr->offset[i]; | |
740 | struct fw_rsc_hdr *hdr = (void *)rproc->table_ptr + offset; | |
fd2c15ec OBC |
741 | int avail = len - offset - sizeof(*hdr); |
742 | void *rsc = (void *)hdr + sizeof(*hdr); | |
743 | ||
744 | /* make sure table isn't truncated */ | |
745 | if (avail < 0) { | |
746 | dev_err(dev, "rsc table is truncated\n"); | |
747 | return -EINVAL; | |
748 | } | |
400e64df | 749 | |
fd2c15ec | 750 | dev_dbg(dev, "rsc: type %d\n", hdr->type); |
400e64df | 751 | |
fd2c15ec OBC |
752 | if (hdr->type >= RSC_LAST) { |
753 | dev_warn(dev, "unsupported resource %d\n", hdr->type); | |
e12bc14b | 754 | continue; |
400e64df OBC |
755 | } |
756 | ||
232fcdbb | 757 | handler = handlers[hdr->type]; |
e12bc14b OBC |
758 | if (!handler) |
759 | continue; | |
760 | ||
a2b950ac | 761 | ret = handler(rproc, rsc, offset + sizeof(*hdr), avail); |
7a186941 | 762 | if (ret) |
400e64df | 763 | break; |
fd2c15ec | 764 | } |
400e64df OBC |
765 | |
766 | return ret; | |
767 | } | |
768 | ||
7bdc9650 BA |
769 | static int rproc_probe_subdevices(struct rproc *rproc) |
770 | { | |
771 | struct rproc_subdev *subdev; | |
772 | int ret; | |
773 | ||
774 | list_for_each_entry(subdev, &rproc->subdevs, node) { | |
775 | ret = subdev->probe(subdev); | |
776 | if (ret) | |
777 | goto unroll_registration; | |
778 | } | |
779 | ||
780 | return 0; | |
781 | ||
782 | unroll_registration: | |
783 | list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node) | |
784 | subdev->remove(subdev); | |
785 | ||
786 | return ret; | |
787 | } | |
788 | ||
789 | static void rproc_remove_subdevices(struct rproc *rproc) | |
790 | { | |
791 | struct rproc_subdev *subdev; | |
792 | ||
793 | list_for_each_entry(subdev, &rproc->subdevs, node) | |
794 | subdev->remove(subdev); | |
795 | } | |
796 | ||
400e64df OBC |
797 | /** |
798 | * rproc_resource_cleanup() - clean up and free all acquired resources | |
799 | * @rproc: rproc handle | |
800 | * | |
801 | * This function will free all resources acquired for @rproc, and it | |
7a186941 | 802 | * is called whenever @rproc either shuts down or fails to boot. |
400e64df OBC |
803 | */ |
804 | static void rproc_resource_cleanup(struct rproc *rproc) | |
805 | { | |
806 | struct rproc_mem_entry *entry, *tmp; | |
d81fb32f | 807 | struct rproc_vdev *rvdev, *rvtmp; |
b5ab5e24 | 808 | struct device *dev = &rproc->dev; |
400e64df OBC |
809 | |
810 | /* clean up debugfs trace entries */ | |
811 | list_for_each_entry_safe(entry, tmp, &rproc->traces, node) { | |
812 | rproc_remove_trace_file(entry->priv); | |
813 | rproc->num_traces--; | |
814 | list_del(&entry->node); | |
815 | kfree(entry); | |
816 | } | |
817 | ||
400e64df OBC |
818 | /* clean up iommu mapping entries */ |
819 | list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) { | |
820 | size_t unmapped; | |
821 | ||
822 | unmapped = iommu_unmap(rproc->domain, entry->da, entry->len); | |
823 | if (unmapped != entry->len) { | |
824 | /* nothing much to do besides complaining */ | |
e981f6d4 | 825 | dev_err(dev, "failed to unmap %u/%zu\n", entry->len, |
730f84ce | 826 | unmapped); |
400e64df OBC |
827 | } |
828 | ||
829 | list_del(&entry->node); | |
830 | kfree(entry); | |
831 | } | |
b6356a01 SA |
832 | |
833 | /* clean up carveout allocations */ | |
834 | list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) { | |
172e6ab1 SA |
835 | dma_free_coherent(dev->parent, entry->len, entry->va, |
836 | entry->dma); | |
b6356a01 SA |
837 | list_del(&entry->node); |
838 | kfree(entry); | |
839 | } | |
d81fb32f BA |
840 | |
841 | /* clean up remote vdev entries */ | |
842 | list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node) | |
843 | rproc_remove_virtio_dev(rvdev); | |
400e64df OBC |
844 | } |
845 | ||
400e64df OBC |
846 | /* |
847 | * take a firmware and boot a remote processor with it. | |
848 | */ | |
849 | static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) | |
850 | { | |
b5ab5e24 | 851 | struct device *dev = &rproc->dev; |
400e64df | 852 | const char *name = rproc->firmware; |
a2b950ac | 853 | struct resource_table *table, *loaded_table; |
1e3e2c7c | 854 | int ret, tablesz; |
400e64df OBC |
855 | |
856 | ret = rproc_fw_sanity_check(rproc, fw); | |
857 | if (ret) | |
858 | return ret; | |
859 | ||
e981f6d4 | 860 | dev_info(dev, "Booting fw image %s, size %zd\n", name, fw->size); |
400e64df OBC |
861 | |
862 | /* | |
863 | * if enabling an IOMMU isn't relevant for this rproc, this is | |
864 | * just a nop | |
865 | */ | |
866 | ret = rproc_enable_iommu(rproc); | |
867 | if (ret) { | |
868 | dev_err(dev, "can't enable iommu: %d\n", ret); | |
869 | return ret; | |
870 | } | |
871 | ||
3e5f9eb5 | 872 | rproc->bootaddr = rproc_get_boot_addr(rproc, fw); |
89970d28 | 873 | ret = -EINVAL; |
400e64df | 874 | |
1e3e2c7c | 875 | /* look for the resource table */ |
bd484984 | 876 | table = rproc_find_rsc_table(rproc, fw, &tablesz); |
a66a5114 SA |
877 | if (!table) { |
878 | dev_err(dev, "Failed to find resource table\n"); | |
1e3e2c7c | 879 | goto clean_up; |
a66a5114 | 880 | } |
1e3e2c7c | 881 | |
988d204c BA |
882 | /* |
883 | * Create a copy of the resource table. When a virtio device starts | |
884 | * and calls vring_new_virtqueue() the address of the allocated vring | |
885 | * will be stored in the cached_table. Before the device is started, | |
886 | * cached_table will be copied into device memory. | |
887 | */ | |
888 | rproc->cached_table = kmemdup(table, tablesz, GFP_KERNEL); | |
889 | if (!rproc->cached_table) | |
a2b950ac | 890 | goto clean_up; |
988d204c BA |
891 | |
892 | rproc->table_ptr = rproc->cached_table; | |
a2b950ac | 893 | |
b35d7afc BA |
894 | /* reset max_notifyid */ |
895 | rproc->max_notifyid = -1; | |
896 | ||
d81fb32f BA |
897 | /* look for virtio devices and register them */ |
898 | ret = rproc_handle_resources(rproc, tablesz, rproc_vdev_handler); | |
899 | if (ret) { | |
900 | dev_err(dev, "Failed to handle vdev resources: %d\n", ret); | |
901 | goto clean_up; | |
902 | } | |
903 | ||
400e64df | 904 | /* handle fw resources which are required to boot rproc */ |
a2b950ac | 905 | ret = rproc_handle_resources(rproc, tablesz, rproc_loading_handlers); |
400e64df OBC |
906 | if (ret) { |
907 | dev_err(dev, "Failed to process resources: %d\n", ret); | |
229b85a6 | 908 | goto clean_up_resources; |
400e64df OBC |
909 | } |
910 | ||
911 | /* load the ELF segments to memory */ | |
bd484984 | 912 | ret = rproc_load_segments(rproc, fw); |
400e64df OBC |
913 | if (ret) { |
914 | dev_err(dev, "Failed to load program segments: %d\n", ret); | |
229b85a6 | 915 | goto clean_up_resources; |
400e64df OBC |
916 | } |
917 | ||
a2b950ac OBC |
918 | /* |
919 | * The starting device has been given the rproc->cached_table as the | |
920 | * resource table. The address of the vring along with the other | |
921 | * allocated resources (carveouts etc) is stored in cached_table. | |
13c4245b BA |
922 | * In order to pass this information to the remote device we must copy |
923 | * this information to device memory. We also update the table_ptr so | |
924 | * that any subsequent changes will be applied to the loaded version. | |
a2b950ac OBC |
925 | */ |
926 | loaded_table = rproc_find_loaded_rsc_table(rproc, fw); | |
13c4245b | 927 | if (loaded_table) { |
e395f9ce | 928 | memcpy(loaded_table, rproc->cached_table, tablesz); |
13c4245b BA |
929 | rproc->table_ptr = loaded_table; |
930 | } | |
a2b950ac | 931 | |
400e64df OBC |
932 | /* power up the remote processor */ |
933 | ret = rproc->ops->start(rproc); | |
934 | if (ret) { | |
935 | dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret); | |
229b85a6 | 936 | goto clean_up_resources; |
400e64df OBC |
937 | } |
938 | ||
7bdc9650 BA |
939 | /* probe any subdevices for the remote processor */ |
940 | ret = rproc_probe_subdevices(rproc); | |
941 | if (ret) { | |
942 | dev_err(dev, "failed to probe subdevices for %s: %d\n", | |
943 | rproc->name, ret); | |
944 | goto stop_rproc; | |
945 | } | |
946 | ||
400e64df OBC |
947 | rproc->state = RPROC_RUNNING; |
948 | ||
949 | dev_info(dev, "remote processor %s is now up\n", rproc->name); | |
950 | ||
951 | return 0; | |
952 | ||
7bdc9650 BA |
953 | stop_rproc: |
954 | rproc->ops->stop(rproc); | |
229b85a6 BA |
955 | clean_up_resources: |
956 | rproc_resource_cleanup(rproc); | |
400e64df | 957 | clean_up: |
988d204c BA |
958 | kfree(rproc->cached_table); |
959 | rproc->cached_table = NULL; | |
960 | rproc->table_ptr = NULL; | |
961 | ||
400e64df OBC |
962 | rproc_disable_iommu(rproc); |
963 | return ret; | |
964 | } | |
965 | ||
966 | /* | |
967 | * take a firmware and look for virtio devices to register. | |
968 | * | |
969 | * Note: this function is called asynchronously upon registration of the | |
970 | * remote processor (so we must wait until it completes before we try | |
971 | * to unregister the device. one other option is just to use kref here, | |
972 | * that might be cleaner). | |
973 | */ | |
974 | static void rproc_fw_config_virtio(const struct firmware *fw, void *context) | |
975 | { | |
976 | struct rproc *rproc = context; | |
a2b950ac | 977 | |
ddf71187 BA |
978 | /* if rproc is marked always-on, request it to boot */ |
979 | if (rproc->auto_boot) | |
980 | rproc_boot_nowait(rproc); | |
981 | ||
3cc6e787 | 982 | release_firmware(fw); |
160e7c84 | 983 | /* allow rproc_del() contexts, if any, to proceed */ |
400e64df OBC |
984 | complete_all(&rproc->firmware_loading_complete); |
985 | } | |
986 | ||
70b85ef8 FGL |
987 | static int rproc_add_virtio_devices(struct rproc *rproc) |
988 | { | |
989 | int ret; | |
990 | ||
991 | /* rproc_del() calls must wait until async loader completes */ | |
992 | init_completion(&rproc->firmware_loading_complete); | |
993 | ||
994 | /* | |
995 | * We must retrieve early virtio configuration info from | |
996 | * the firmware (e.g. whether to register a virtio device, | |
997 | * what virtio features does it support, ...). | |
998 | * | |
999 | * We're initiating an asynchronous firmware loading, so we can | |
1000 | * be built-in kernel code, without hanging the boot process. | |
1001 | */ | |
1002 | ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG, | |
1003 | rproc->firmware, &rproc->dev, GFP_KERNEL, | |
1004 | rproc, rproc_fw_config_virtio); | |
1005 | if (ret < 0) { | |
1006 | dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret); | |
1007 | complete_all(&rproc->firmware_loading_complete); | |
1008 | } | |
1009 | ||
1010 | return ret; | |
1011 | } | |
1012 | ||
1013 | /** | |
1014 | * rproc_trigger_recovery() - recover a remoteproc | |
1015 | * @rproc: the remote processor | |
1016 | * | |
56324d7a | 1017 | * The recovery is done by resetting all the virtio devices, that way all the |
70b85ef8 FGL |
1018 | * rpmsg drivers will be reseted along with the remote processor making the |
1019 | * remoteproc functional again. | |
1020 | * | |
1021 | * This function can sleep, so it cannot be called from atomic context. | |
1022 | */ | |
1023 | int rproc_trigger_recovery(struct rproc *rproc) | |
1024 | { | |
70b85ef8 FGL |
1025 | dev_err(&rproc->dev, "recovering %s\n", rproc->name); |
1026 | ||
1027 | init_completion(&rproc->crash_comp); | |
1028 | ||
ddf71187 BA |
1029 | /* shut down the remote */ |
1030 | /* TODO: make sure this works with rproc->power > 1 */ | |
1031 | rproc_shutdown(rproc); | |
1032 | ||
70b85ef8 FGL |
1033 | /* wait until there is no more rproc users */ |
1034 | wait_for_completion(&rproc->crash_comp); | |
1035 | ||
ddf71187 | 1036 | /* |
d81fb32f | 1037 | * boot the remote processor up again |
ddf71187 | 1038 | */ |
d81fb32f | 1039 | rproc_boot(rproc); |
ddf71187 BA |
1040 | |
1041 | return 0; | |
70b85ef8 FGL |
1042 | } |
1043 | ||
8afd519c FGL |
1044 | /** |
1045 | * rproc_crash_handler_work() - handle a crash | |
1046 | * | |
1047 | * This function needs to handle everything related to a crash, like cpu | |
1048 | * registers and stack dump, information to help to debug the fatal error, etc. | |
1049 | */ | |
1050 | static void rproc_crash_handler_work(struct work_struct *work) | |
1051 | { | |
1052 | struct rproc *rproc = container_of(work, struct rproc, crash_handler); | |
1053 | struct device *dev = &rproc->dev; | |
1054 | ||
1055 | dev_dbg(dev, "enter %s\n", __func__); | |
1056 | ||
1057 | mutex_lock(&rproc->lock); | |
1058 | ||
1059 | if (rproc->state == RPROC_CRASHED || rproc->state == RPROC_OFFLINE) { | |
1060 | /* handle only the first crash detected */ | |
1061 | mutex_unlock(&rproc->lock); | |
1062 | return; | |
1063 | } | |
1064 | ||
1065 | rproc->state = RPROC_CRASHED; | |
1066 | dev_err(dev, "handling crash #%u in %s\n", ++rproc->crash_cnt, | |
1067 | rproc->name); | |
1068 | ||
1069 | mutex_unlock(&rproc->lock); | |
1070 | ||
2e37abb8 FGL |
1071 | if (!rproc->recovery_disabled) |
1072 | rproc_trigger_recovery(rproc); | |
8afd519c FGL |
1073 | } |
1074 | ||
400e64df | 1075 | /** |
3d87fa1d | 1076 | * __rproc_boot() - boot a remote processor |
400e64df | 1077 | * @rproc: handle of a remote processor |
3d87fa1d | 1078 | * @wait: wait for rproc registration completion |
400e64df OBC |
1079 | * |
1080 | * Boot a remote processor (i.e. load its firmware, power it on, ...). | |
1081 | * | |
1082 | * If the remote processor is already powered on, this function immediately | |
1083 | * returns (successfully). | |
1084 | * | |
1085 | * Returns 0 on success, and an appropriate error value otherwise. | |
1086 | */ | |
3d87fa1d | 1087 | static int __rproc_boot(struct rproc *rproc, bool wait) |
400e64df OBC |
1088 | { |
1089 | const struct firmware *firmware_p; | |
1090 | struct device *dev; | |
1091 | int ret; | |
1092 | ||
1093 | if (!rproc) { | |
1094 | pr_err("invalid rproc handle\n"); | |
1095 | return -EINVAL; | |
1096 | } | |
1097 | ||
b5ab5e24 | 1098 | dev = &rproc->dev; |
400e64df OBC |
1099 | |
1100 | ret = mutex_lock_interruptible(&rproc->lock); | |
1101 | if (ret) { | |
1102 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); | |
1103 | return ret; | |
1104 | } | |
1105 | ||
400e64df OBC |
1106 | /* skip the boot process if rproc is already powered up */ |
1107 | if (atomic_inc_return(&rproc->power) > 1) { | |
1108 | ret = 0; | |
1109 | goto unlock_mutex; | |
1110 | } | |
1111 | ||
1112 | dev_info(dev, "powering up %s\n", rproc->name); | |
1113 | ||
1114 | /* load firmware */ | |
1115 | ret = request_firmware(&firmware_p, rproc->firmware, dev); | |
1116 | if (ret < 0) { | |
1117 | dev_err(dev, "request_firmware failed: %d\n", ret); | |
1118 | goto downref_rproc; | |
1119 | } | |
1120 | ||
3d87fa1d LJ |
1121 | /* if rproc virtio is not yet configured, wait */ |
1122 | if (wait) | |
1123 | wait_for_completion(&rproc->firmware_loading_complete); | |
1124 | ||
400e64df OBC |
1125 | ret = rproc_fw_boot(rproc, firmware_p); |
1126 | ||
1127 | release_firmware(firmware_p); | |
1128 | ||
1129 | downref_rproc: | |
fbb6aacb | 1130 | if (ret) |
400e64df | 1131 | atomic_dec(&rproc->power); |
400e64df OBC |
1132 | unlock_mutex: |
1133 | mutex_unlock(&rproc->lock); | |
1134 | return ret; | |
1135 | } | |
3d87fa1d LJ |
1136 | |
1137 | /** | |
1138 | * rproc_boot() - boot a remote processor | |
1139 | * @rproc: handle of a remote processor | |
1140 | */ | |
1141 | int rproc_boot(struct rproc *rproc) | |
1142 | { | |
1143 | return __rproc_boot(rproc, true); | |
1144 | } | |
400e64df OBC |
1145 | EXPORT_SYMBOL(rproc_boot); |
1146 | ||
3d87fa1d LJ |
1147 | /** |
1148 | * rproc_boot_nowait() - boot a remote processor | |
1149 | * @rproc: handle of a remote processor | |
1150 | * | |
1151 | * Same as rproc_boot() but don't wait for rproc registration completion | |
1152 | */ | |
1153 | int rproc_boot_nowait(struct rproc *rproc) | |
1154 | { | |
1155 | return __rproc_boot(rproc, false); | |
1156 | } | |
1157 | ||
400e64df OBC |
1158 | /** |
1159 | * rproc_shutdown() - power off the remote processor | |
1160 | * @rproc: the remote processor | |
1161 | * | |
1162 | * Power off a remote processor (previously booted with rproc_boot()). | |
1163 | * | |
1164 | * In case @rproc is still being used by an additional user(s), then | |
1165 | * this function will just decrement the power refcount and exit, | |
1166 | * without really powering off the device. | |
1167 | * | |
1168 | * Every call to rproc_boot() must (eventually) be accompanied by a call | |
1169 | * to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug. | |
1170 | * | |
1171 | * Notes: | |
1172 | * - we're not decrementing the rproc's refcount, only the power refcount. | |
1173 | * which means that the @rproc handle stays valid even after rproc_shutdown() | |
1174 | * returns, and users can still use it with a subsequent rproc_boot(), if | |
1175 | * needed. | |
400e64df OBC |
1176 | */ |
1177 | void rproc_shutdown(struct rproc *rproc) | |
1178 | { | |
b5ab5e24 | 1179 | struct device *dev = &rproc->dev; |
400e64df OBC |
1180 | int ret; |
1181 | ||
1182 | ret = mutex_lock_interruptible(&rproc->lock); | |
1183 | if (ret) { | |
1184 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); | |
1185 | return; | |
1186 | } | |
1187 | ||
1188 | /* if the remote proc is still needed, bail out */ | |
1189 | if (!atomic_dec_and_test(&rproc->power)) | |
1190 | goto out; | |
1191 | ||
7bdc9650 BA |
1192 | /* remove any subdevices for the remote processor */ |
1193 | rproc_remove_subdevices(rproc); | |
1194 | ||
400e64df OBC |
1195 | /* power off the remote processor */ |
1196 | ret = rproc->ops->stop(rproc); | |
1197 | if (ret) { | |
1198 | atomic_inc(&rproc->power); | |
1199 | dev_err(dev, "can't stop rproc: %d\n", ret); | |
1200 | goto out; | |
1201 | } | |
1202 | ||
1203 | /* clean up all acquired resources */ | |
1204 | rproc_resource_cleanup(rproc); | |
1205 | ||
1206 | rproc_disable_iommu(rproc); | |
1207 | ||
988d204c BA |
1208 | /* Free the copy of the resource table */ |
1209 | kfree(rproc->cached_table); | |
1210 | rproc->cached_table = NULL; | |
1211 | rproc->table_ptr = NULL; | |
a2b950ac | 1212 | |
70b85ef8 FGL |
1213 | /* if in crash state, unlock crash handler */ |
1214 | if (rproc->state == RPROC_CRASHED) | |
1215 | complete_all(&rproc->crash_comp); | |
1216 | ||
400e64df OBC |
1217 | rproc->state = RPROC_OFFLINE; |
1218 | ||
1219 | dev_info(dev, "stopped remote processor %s\n", rproc->name); | |
1220 | ||
1221 | out: | |
1222 | mutex_unlock(&rproc->lock); | |
400e64df OBC |
1223 | } |
1224 | EXPORT_SYMBOL(rproc_shutdown); | |
1225 | ||
fec47d86 DG |
1226 | /** |
1227 | * rproc_get_by_phandle() - find a remote processor by phandle | |
1228 | * @phandle: phandle to the rproc | |
1229 | * | |
1230 | * Finds an rproc handle using the remote processor's phandle, and then | |
1231 | * return a handle to the rproc. | |
1232 | * | |
1233 | * This function increments the remote processor's refcount, so always | |
1234 | * use rproc_put() to decrement it back once rproc isn't needed anymore. | |
1235 | * | |
1236 | * Returns the rproc handle on success, and NULL on failure. | |
1237 | */ | |
8de3dbd0 | 1238 | #ifdef CONFIG_OF |
fec47d86 DG |
1239 | struct rproc *rproc_get_by_phandle(phandle phandle) |
1240 | { | |
1241 | struct rproc *rproc = NULL, *r; | |
1242 | struct device_node *np; | |
1243 | ||
1244 | np = of_find_node_by_phandle(phandle); | |
1245 | if (!np) | |
1246 | return NULL; | |
1247 | ||
1248 | mutex_lock(&rproc_list_mutex); | |
1249 | list_for_each_entry(r, &rproc_list, node) { | |
1250 | if (r->dev.parent && r->dev.parent->of_node == np) { | |
fbb6aacb BA |
1251 | /* prevent underlying implementation from being removed */ |
1252 | if (!try_module_get(r->dev.parent->driver->owner)) { | |
1253 | dev_err(&r->dev, "can't get owner\n"); | |
1254 | break; | |
1255 | } | |
1256 | ||
fec47d86 DG |
1257 | rproc = r; |
1258 | get_device(&rproc->dev); | |
1259 | break; | |
1260 | } | |
1261 | } | |
1262 | mutex_unlock(&rproc_list_mutex); | |
1263 | ||
1264 | of_node_put(np); | |
1265 | ||
1266 | return rproc; | |
1267 | } | |
8de3dbd0 OBC |
1268 | #else |
1269 | struct rproc *rproc_get_by_phandle(phandle phandle) | |
1270 | { | |
1271 | return NULL; | |
1272 | } | |
1273 | #endif | |
fec47d86 DG |
1274 | EXPORT_SYMBOL(rproc_get_by_phandle); |
1275 | ||
400e64df | 1276 | /** |
160e7c84 | 1277 | * rproc_add() - register a remote processor |
400e64df OBC |
1278 | * @rproc: the remote processor handle to register |
1279 | * | |
1280 | * Registers @rproc with the remoteproc framework, after it has been | |
1281 | * allocated with rproc_alloc(). | |
1282 | * | |
1283 | * This is called by the platform-specific rproc implementation, whenever | |
1284 | * a new remote processor device is probed. | |
1285 | * | |
1286 | * Returns 0 on success and an appropriate error code otherwise. | |
1287 | * | |
1288 | * Note: this function initiates an asynchronous firmware loading | |
1289 | * context, which will look for virtio devices supported by the rproc's | |
1290 | * firmware. | |
1291 | * | |
1292 | * If found, those virtio devices will be created and added, so as a result | |
7a186941 | 1293 | * of registering this remote processor, additional virtio drivers might be |
400e64df | 1294 | * probed. |
400e64df | 1295 | */ |
160e7c84 | 1296 | int rproc_add(struct rproc *rproc) |
400e64df | 1297 | { |
b5ab5e24 | 1298 | struct device *dev = &rproc->dev; |
70b85ef8 | 1299 | int ret; |
400e64df | 1300 | |
b5ab5e24 OBC |
1301 | ret = device_add(dev); |
1302 | if (ret < 0) | |
1303 | return ret; | |
400e64df | 1304 | |
b5ab5e24 | 1305 | dev_info(dev, "%s is available\n", rproc->name); |
400e64df | 1306 | |
489d129a OBC |
1307 | dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n"); |
1308 | dev_info(dev, "THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.\n"); | |
1309 | ||
400e64df OBC |
1310 | /* create debugfs entries */ |
1311 | rproc_create_debug_dir(rproc); | |
d2e12e66 DG |
1312 | ret = rproc_add_virtio_devices(rproc); |
1313 | if (ret < 0) | |
1314 | return ret; | |
400e64df | 1315 | |
d2e12e66 DG |
1316 | /* expose to rproc_get_by_phandle users */ |
1317 | mutex_lock(&rproc_list_mutex); | |
1318 | list_add(&rproc->node, &rproc_list); | |
1319 | mutex_unlock(&rproc_list_mutex); | |
1320 | ||
1321 | return 0; | |
400e64df | 1322 | } |
160e7c84 | 1323 | EXPORT_SYMBOL(rproc_add); |
400e64df | 1324 | |
b5ab5e24 OBC |
1325 | /** |
1326 | * rproc_type_release() - release a remote processor instance | |
1327 | * @dev: the rproc's device | |
1328 | * | |
1329 | * This function should _never_ be called directly. | |
1330 | * | |
1331 | * It will be called by the driver core when no one holds a valid pointer | |
1332 | * to @dev anymore. | |
1333 | */ | |
1334 | static void rproc_type_release(struct device *dev) | |
1335 | { | |
1336 | struct rproc *rproc = container_of(dev, struct rproc, dev); | |
1337 | ||
7183a2a7 OBC |
1338 | dev_info(&rproc->dev, "releasing %s\n", rproc->name); |
1339 | ||
1340 | rproc_delete_debug_dir(rproc); | |
1341 | ||
b5ab5e24 OBC |
1342 | idr_destroy(&rproc->notifyids); |
1343 | ||
1344 | if (rproc->index >= 0) | |
1345 | ida_simple_remove(&rproc_dev_index, rproc->index); | |
1346 | ||
0f57dc6a | 1347 | kfree(rproc->firmware); |
b5ab5e24 OBC |
1348 | kfree(rproc); |
1349 | } | |
1350 | ||
1351 | static struct device_type rproc_type = { | |
1352 | .name = "remoteproc", | |
1353 | .release = rproc_type_release, | |
1354 | }; | |
400e64df OBC |
1355 | |
1356 | /** | |
1357 | * rproc_alloc() - allocate a remote processor handle | |
1358 | * @dev: the underlying device | |
1359 | * @name: name of this remote processor | |
1360 | * @ops: platform-specific handlers (mainly start/stop) | |
8b4aec9a | 1361 | * @firmware: name of firmware file to load, can be NULL |
400e64df OBC |
1362 | * @len: length of private data needed by the rproc driver (in bytes) |
1363 | * | |
1364 | * Allocates a new remote processor handle, but does not register | |
8b4aec9a | 1365 | * it yet. if @firmware is NULL, a default name is used. |
400e64df OBC |
1366 | * |
1367 | * This function should be used by rproc implementations during initialization | |
1368 | * of the remote processor. | |
1369 | * | |
1370 | * After creating an rproc handle using this function, and when ready, | |
160e7c84 | 1371 | * implementations should then call rproc_add() to complete |
400e64df OBC |
1372 | * the registration of the remote processor. |
1373 | * | |
1374 | * On success the new rproc is returned, and on failure, NULL. | |
1375 | * | |
1376 | * Note: _never_ directly deallocate @rproc, even if it was not registered | |
433c0e04 | 1377 | * yet. Instead, when you need to unroll rproc_alloc(), use rproc_free(). |
400e64df OBC |
1378 | */ |
1379 | struct rproc *rproc_alloc(struct device *dev, const char *name, | |
730f84ce AS |
1380 | const struct rproc_ops *ops, |
1381 | const char *firmware, int len) | |
400e64df OBC |
1382 | { |
1383 | struct rproc *rproc; | |
8b4aec9a | 1384 | char *p, *template = "rproc-%s-fw"; |
0f57dc6a | 1385 | int name_len; |
400e64df OBC |
1386 | |
1387 | if (!dev || !name || !ops) | |
1388 | return NULL; | |
1389 | ||
0f57dc6a | 1390 | if (!firmware) { |
8b4aec9a | 1391 | /* |
8b4aec9a | 1392 | * If the caller didn't pass in a firmware name then |
0f57dc6a | 1393 | * construct a default name. |
8b4aec9a RT |
1394 | */ |
1395 | name_len = strlen(name) + strlen(template) - 2 + 1; | |
0f57dc6a MR |
1396 | p = kmalloc(name_len, GFP_KERNEL); |
1397 | if (!p) | |
1398 | return NULL; | |
8b4aec9a RT |
1399 | snprintf(p, name_len, template, name); |
1400 | } else { | |
0f57dc6a MR |
1401 | p = kstrdup(firmware, GFP_KERNEL); |
1402 | if (!p) | |
1403 | return NULL; | |
1404 | } | |
1405 | ||
1406 | rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL); | |
1407 | if (!rproc) { | |
1408 | kfree(p); | |
1409 | return NULL; | |
8b4aec9a RT |
1410 | } |
1411 | ||
1412 | rproc->firmware = p; | |
400e64df OBC |
1413 | rproc->name = name; |
1414 | rproc->ops = ops; | |
400e64df | 1415 | rproc->priv = &rproc[1]; |
ddf71187 | 1416 | rproc->auto_boot = true; |
400e64df | 1417 | |
b5ab5e24 OBC |
1418 | device_initialize(&rproc->dev); |
1419 | rproc->dev.parent = dev; | |
1420 | rproc->dev.type = &rproc_type; | |
2aefbef0 | 1421 | rproc->dev.class = &rproc_class; |
b5ab5e24 OBC |
1422 | |
1423 | /* Assign a unique device index and name */ | |
1424 | rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL); | |
1425 | if (rproc->index < 0) { | |
1426 | dev_err(dev, "ida_simple_get failed: %d\n", rproc->index); | |
1427 | put_device(&rproc->dev); | |
1428 | return NULL; | |
1429 | } | |
1430 | ||
1431 | dev_set_name(&rproc->dev, "remoteproc%d", rproc->index); | |
1432 | ||
400e64df OBC |
1433 | atomic_set(&rproc->power, 0); |
1434 | ||
4afc89d6 SB |
1435 | /* Set ELF as the default fw_ops handler */ |
1436 | rproc->fw_ops = &rproc_elf_fw_ops; | |
400e64df OBC |
1437 | |
1438 | mutex_init(&rproc->lock); | |
1439 | ||
7a186941 OBC |
1440 | idr_init(&rproc->notifyids); |
1441 | ||
400e64df OBC |
1442 | INIT_LIST_HEAD(&rproc->carveouts); |
1443 | INIT_LIST_HEAD(&rproc->mappings); | |
1444 | INIT_LIST_HEAD(&rproc->traces); | |
7a186941 | 1445 | INIT_LIST_HEAD(&rproc->rvdevs); |
7bdc9650 | 1446 | INIT_LIST_HEAD(&rproc->subdevs); |
400e64df | 1447 | |
8afd519c | 1448 | INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work); |
70b85ef8 | 1449 | init_completion(&rproc->crash_comp); |
8afd519c | 1450 | |
400e64df OBC |
1451 | rproc->state = RPROC_OFFLINE; |
1452 | ||
1453 | return rproc; | |
1454 | } | |
1455 | EXPORT_SYMBOL(rproc_alloc); | |
1456 | ||
1457 | /** | |
433c0e04 BA |
1458 | * rproc_free() - unroll rproc_alloc() |
1459 | * @rproc: the remote processor handle | |
1460 | * | |
1461 | * This function decrements the rproc dev refcount. | |
1462 | * | |
1463 | * If no one holds any reference to rproc anymore, then its refcount would | |
1464 | * now drop to zero, and it would be freed. | |
1465 | */ | |
1466 | void rproc_free(struct rproc *rproc) | |
1467 | { | |
1468 | put_device(&rproc->dev); | |
1469 | } | |
1470 | EXPORT_SYMBOL(rproc_free); | |
1471 | ||
1472 | /** | |
1473 | * rproc_put() - release rproc reference | |
400e64df OBC |
1474 | * @rproc: the remote processor handle |
1475 | * | |
c6b5a276 | 1476 | * This function decrements the rproc dev refcount. |
400e64df | 1477 | * |
c6b5a276 OBC |
1478 | * If no one holds any reference to rproc anymore, then its refcount would |
1479 | * now drop to zero, and it would be freed. | |
400e64df | 1480 | */ |
160e7c84 | 1481 | void rproc_put(struct rproc *rproc) |
400e64df | 1482 | { |
fbb6aacb | 1483 | module_put(rproc->dev.parent->driver->owner); |
b5ab5e24 | 1484 | put_device(&rproc->dev); |
400e64df | 1485 | } |
160e7c84 | 1486 | EXPORT_SYMBOL(rproc_put); |
400e64df OBC |
1487 | |
1488 | /** | |
160e7c84 | 1489 | * rproc_del() - unregister a remote processor |
400e64df OBC |
1490 | * @rproc: rproc handle to unregister |
1491 | * | |
400e64df OBC |
1492 | * This function should be called when the platform specific rproc |
1493 | * implementation decides to remove the rproc device. it should | |
160e7c84 | 1494 | * _only_ be called if a previous invocation of rproc_add() |
400e64df OBC |
1495 | * has completed successfully. |
1496 | * | |
160e7c84 | 1497 | * After rproc_del() returns, @rproc isn't freed yet, because |
c6b5a276 | 1498 | * of the outstanding reference created by rproc_alloc. To decrement that |
433c0e04 | 1499 | * one last refcount, one still needs to call rproc_free(). |
400e64df OBC |
1500 | * |
1501 | * Returns 0 on success and -EINVAL if @rproc isn't valid. | |
1502 | */ | |
160e7c84 | 1503 | int rproc_del(struct rproc *rproc) |
400e64df | 1504 | { |
6db20ea8 | 1505 | struct rproc_vdev *rvdev, *tmp; |
7a186941 | 1506 | |
400e64df OBC |
1507 | if (!rproc) |
1508 | return -EINVAL; | |
1509 | ||
1510 | /* if rproc is just being registered, wait */ | |
1511 | wait_for_completion(&rproc->firmware_loading_complete); | |
1512 | ||
ddf71187 BA |
1513 | /* if rproc is marked always-on, rproc_add() booted it */ |
1514 | /* TODO: make sure this works with rproc->power > 1 */ | |
1515 | if (rproc->auto_boot) | |
1516 | rproc_shutdown(rproc); | |
1517 | ||
7a186941 | 1518 | /* clean up remote vdev entries */ |
6db20ea8 | 1519 | list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node) |
7a186941 | 1520 | rproc_remove_virtio_dev(rvdev); |
400e64df | 1521 | |
fec47d86 DG |
1522 | /* the rproc is downref'ed as soon as it's removed from the klist */ |
1523 | mutex_lock(&rproc_list_mutex); | |
1524 | list_del(&rproc->node); | |
1525 | mutex_unlock(&rproc_list_mutex); | |
1526 | ||
b5ab5e24 | 1527 | device_del(&rproc->dev); |
400e64df OBC |
1528 | |
1529 | return 0; | |
1530 | } | |
160e7c84 | 1531 | EXPORT_SYMBOL(rproc_del); |
400e64df | 1532 | |
7bdc9650 BA |
1533 | /** |
1534 | * rproc_add_subdev() - add a subdevice to a remoteproc | |
1535 | * @rproc: rproc handle to add the subdevice to | |
1536 | * @subdev: subdev handle to register | |
1537 | * @probe: function to call when the rproc boots | |
1538 | * @remove: function to call when the rproc shuts down | |
1539 | */ | |
1540 | void rproc_add_subdev(struct rproc *rproc, | |
1541 | struct rproc_subdev *subdev, | |
1542 | int (*probe)(struct rproc_subdev *subdev), | |
1543 | void (*remove)(struct rproc_subdev *subdev)) | |
1544 | { | |
1545 | subdev->probe = probe; | |
1546 | subdev->remove = remove; | |
1547 | ||
1548 | list_add_tail(&subdev->node, &rproc->subdevs); | |
1549 | } | |
1550 | EXPORT_SYMBOL(rproc_add_subdev); | |
1551 | ||
1552 | /** | |
1553 | * rproc_remove_subdev() - remove a subdevice from a remoteproc | |
1554 | * @rproc: rproc handle to remove the subdevice from | |
1555 | * @subdev: subdev handle, previously registered with rproc_add_subdev() | |
1556 | */ | |
1557 | void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev) | |
1558 | { | |
1559 | list_del(&subdev->node); | |
1560 | } | |
1561 | EXPORT_SYMBOL(rproc_remove_subdev); | |
1562 | ||
8afd519c FGL |
1563 | /** |
1564 | * rproc_report_crash() - rproc crash reporter function | |
1565 | * @rproc: remote processor | |
1566 | * @type: crash type | |
1567 | * | |
1568 | * This function must be called every time a crash is detected by the low-level | |
1569 | * drivers implementing a specific remoteproc. This should not be called from a | |
1570 | * non-remoteproc driver. | |
1571 | * | |
1572 | * This function can be called from atomic/interrupt context. | |
1573 | */ | |
1574 | void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type) | |
1575 | { | |
1576 | if (!rproc) { | |
1577 | pr_err("NULL rproc pointer\n"); | |
1578 | return; | |
1579 | } | |
1580 | ||
1581 | dev_err(&rproc->dev, "crash detected in %s: type %s\n", | |
1582 | rproc->name, rproc_crash_to_string(type)); | |
1583 | ||
1584 | /* create a new task to handle the error */ | |
1585 | schedule_work(&rproc->crash_handler); | |
1586 | } | |
1587 | EXPORT_SYMBOL(rproc_report_crash); | |
1588 | ||
400e64df OBC |
1589 | static int __init remoteproc_init(void) |
1590 | { | |
2aefbef0 | 1591 | rproc_init_sysfs(); |
400e64df | 1592 | rproc_init_debugfs(); |
b5ab5e24 | 1593 | |
400e64df OBC |
1594 | return 0; |
1595 | } | |
1596 | module_init(remoteproc_init); | |
1597 | ||
1598 | static void __exit remoteproc_exit(void) | |
1599 | { | |
f42f79af SA |
1600 | ida_destroy(&rproc_dev_index); |
1601 | ||
400e64df | 1602 | rproc_exit_debugfs(); |
2aefbef0 | 1603 | rproc_exit_sysfs(); |
400e64df OBC |
1604 | } |
1605 | module_exit(remoteproc_exit); | |
1606 | ||
1607 | MODULE_LICENSE("GPL v2"); | |
1608 | MODULE_DESCRIPTION("Generic Remote Processor Framework"); |