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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/elf.h> |
40 | #include <linux/virtio_ids.h> | |
41 | #include <linux/virtio_ring.h> | |
cf59d3e9 | 42 | #include <asm/byteorder.h> |
400e64df OBC |
43 | |
44 | #include "remoteproc_internal.h" | |
45 | ||
400e64df | 46 | typedef int (*rproc_handle_resources_t)(struct rproc *rproc, |
fd2c15ec OBC |
47 | struct resource_table *table, int len); |
48 | typedef int (*rproc_handle_resource_t)(struct rproc *rproc, void *, int avail); | |
400e64df | 49 | |
b5ab5e24 OBC |
50 | /* Unique indices for remoteproc devices */ |
51 | static DEFINE_IDA(rproc_dev_index); | |
52 | ||
8afd519c FGL |
53 | static const char * const rproc_crash_names[] = { |
54 | [RPROC_MMUFAULT] = "mmufault", | |
55 | }; | |
56 | ||
57 | /* translate rproc_crash_type to string */ | |
58 | static const char *rproc_crash_to_string(enum rproc_crash_type type) | |
59 | { | |
60 | if (type < ARRAY_SIZE(rproc_crash_names)) | |
61 | return rproc_crash_names[type]; | |
62 | return "unkown"; | |
63 | } | |
64 | ||
400e64df OBC |
65 | /* |
66 | * This is the IOMMU fault handler we register with the IOMMU API | |
67 | * (when relevant; not all remote processors access memory through | |
68 | * an IOMMU). | |
69 | * | |
70 | * IOMMU core will invoke this handler whenever the remote processor | |
71 | * will try to access an unmapped device address. | |
400e64df OBC |
72 | */ |
73 | static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev, | |
77ca2332 | 74 | unsigned long iova, int flags, void *token) |
400e64df | 75 | { |
8afd519c FGL |
76 | struct rproc *rproc = token; |
77 | ||
400e64df OBC |
78 | dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags); |
79 | ||
8afd519c FGL |
80 | rproc_report_crash(rproc, RPROC_MMUFAULT); |
81 | ||
400e64df OBC |
82 | /* |
83 | * Let the iommu core know we're not really handling this fault; | |
8afd519c | 84 | * we just used it as a recovery trigger. |
400e64df OBC |
85 | */ |
86 | return -ENOSYS; | |
87 | } | |
88 | ||
89 | static int rproc_enable_iommu(struct rproc *rproc) | |
90 | { | |
91 | struct iommu_domain *domain; | |
b5ab5e24 | 92 | struct device *dev = rproc->dev.parent; |
400e64df OBC |
93 | int ret; |
94 | ||
95 | /* | |
96 | * We currently use iommu_present() to decide if an IOMMU | |
97 | * setup is needed. | |
98 | * | |
99 | * This works for simple cases, but will easily fail with | |
100 | * platforms that do have an IOMMU, but not for this specific | |
101 | * rproc. | |
102 | * | |
103 | * This will be easily solved by introducing hw capabilities | |
104 | * that will be set by the remoteproc driver. | |
105 | */ | |
106 | if (!iommu_present(dev->bus)) { | |
0798e1da MG |
107 | dev_dbg(dev, "iommu not found\n"); |
108 | return 0; | |
400e64df OBC |
109 | } |
110 | ||
111 | domain = iommu_domain_alloc(dev->bus); | |
112 | if (!domain) { | |
113 | dev_err(dev, "can't alloc iommu domain\n"); | |
114 | return -ENOMEM; | |
115 | } | |
116 | ||
77ca2332 | 117 | iommu_set_fault_handler(domain, rproc_iommu_fault, rproc); |
400e64df OBC |
118 | |
119 | ret = iommu_attach_device(domain, dev); | |
120 | if (ret) { | |
121 | dev_err(dev, "can't attach iommu device: %d\n", ret); | |
122 | goto free_domain; | |
123 | } | |
124 | ||
125 | rproc->domain = domain; | |
126 | ||
127 | return 0; | |
128 | ||
129 | free_domain: | |
130 | iommu_domain_free(domain); | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static void rproc_disable_iommu(struct rproc *rproc) | |
135 | { | |
136 | struct iommu_domain *domain = rproc->domain; | |
b5ab5e24 | 137 | struct device *dev = rproc->dev.parent; |
400e64df OBC |
138 | |
139 | if (!domain) | |
140 | return; | |
141 | ||
142 | iommu_detach_device(domain, dev); | |
143 | iommu_domain_free(domain); | |
144 | ||
145 | return; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Some remote processors will ask us to allocate them physically contiguous | |
150 | * memory regions (which we call "carveouts"), and map them to specific | |
151 | * device addresses (which are hardcoded in the firmware). | |
152 | * | |
153 | * They may then ask us to copy objects into specific device addresses (e.g. | |
154 | * code/data sections) or expose us certain symbols in other device address | |
155 | * (e.g. their trace buffer). | |
156 | * | |
157 | * This function is an internal helper with which we can go over the allocated | |
158 | * carveouts and translate specific device address to kernel virtual addresses | |
159 | * so we can access the referenced memory. | |
160 | * | |
161 | * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too, | |
162 | * but only on kernel direct mapped RAM memory. Instead, we're just using | |
163 | * here the output of the DMA API, which should be more correct. | |
164 | */ | |
72854fb0 | 165 | void *rproc_da_to_va(struct rproc *rproc, u64 da, int len) |
400e64df OBC |
166 | { |
167 | struct rproc_mem_entry *carveout; | |
168 | void *ptr = NULL; | |
169 | ||
170 | list_for_each_entry(carveout, &rproc->carveouts, node) { | |
171 | int offset = da - carveout->da; | |
172 | ||
173 | /* try next carveout if da is too small */ | |
174 | if (offset < 0) | |
175 | continue; | |
176 | ||
177 | /* try next carveout if da is too large */ | |
178 | if (offset + len > carveout->len) | |
179 | continue; | |
180 | ||
181 | ptr = carveout->va + offset; | |
182 | ||
183 | break; | |
184 | } | |
185 | ||
186 | return ptr; | |
187 | } | |
4afc89d6 | 188 | EXPORT_SYMBOL(rproc_da_to_va); |
400e64df | 189 | |
6db20ea8 | 190 | int rproc_alloc_vring(struct rproc_vdev *rvdev, int i) |
400e64df | 191 | { |
7a186941 | 192 | struct rproc *rproc = rvdev->rproc; |
b5ab5e24 | 193 | struct device *dev = &rproc->dev; |
6db20ea8 | 194 | struct rproc_vring *rvring = &rvdev->vring[i]; |
7a186941 OBC |
195 | dma_addr_t dma; |
196 | void *va; | |
197 | int ret, size, notifyid; | |
400e64df | 198 | |
7a186941 | 199 | /* actual size of vring (in bytes) */ |
6db20ea8 | 200 | size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); |
7a186941 | 201 | |
7a186941 OBC |
202 | /* |
203 | * Allocate non-cacheable memory for the vring. In the future | |
204 | * this call will also configure the IOMMU for us | |
6db20ea8 | 205 | * TODO: let the rproc know the da of this vring |
7a186941 | 206 | */ |
b5ab5e24 | 207 | va = dma_alloc_coherent(dev->parent, size, &dma, GFP_KERNEL); |
7a186941 | 208 | if (!va) { |
b5ab5e24 | 209 | dev_err(dev->parent, "dma_alloc_coherent failed\n"); |
400e64df OBC |
210 | return -EINVAL; |
211 | } | |
212 | ||
6db20ea8 OBC |
213 | /* |
214 | * Assign an rproc-wide unique index for this vring | |
215 | * TODO: assign a notifyid for rvdev updates as well | |
216 | * TODO: let the rproc know the notifyid of this vring | |
217 | * TODO: support predefined notifyids (via resource table) | |
218 | */ | |
15fc6110 | 219 | ret = idr_alloc(&rproc->notifyids, rvring, 0, 0, GFP_KERNEL); |
7a186941 | 220 | if (ret) { |
15fc6110 | 221 | dev_err(dev, "idr_alloc failed: %d\n", ret); |
b5ab5e24 | 222 | dma_free_coherent(dev->parent, size, va, dma); |
7a186941 OBC |
223 | return ret; |
224 | } | |
15fc6110 | 225 | notifyid = ret; |
400e64df | 226 | |
099a3f33 SB |
227 | /* Store largest notifyid */ |
228 | rproc->max_notifyid = max(rproc->max_notifyid, notifyid); | |
229 | ||
d09f53a7 EG |
230 | dev_dbg(dev, "vring%d: va %p dma %llx size %x idr %d\n", i, va, |
231 | (unsigned long long)dma, size, notifyid); | |
7a186941 | 232 | |
6db20ea8 OBC |
233 | rvring->va = va; |
234 | rvring->dma = dma; | |
235 | rvring->notifyid = notifyid; | |
400e64df OBC |
236 | |
237 | return 0; | |
238 | } | |
239 | ||
6db20ea8 OBC |
240 | static int |
241 | rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i) | |
7a186941 OBC |
242 | { |
243 | struct rproc *rproc = rvdev->rproc; | |
b5ab5e24 | 244 | struct device *dev = &rproc->dev; |
6db20ea8 OBC |
245 | struct fw_rsc_vdev_vring *vring = &rsc->vring[i]; |
246 | struct rproc_vring *rvring = &rvdev->vring[i]; | |
7a186941 | 247 | |
6db20ea8 OBC |
248 | dev_dbg(dev, "vdev rsc: vring%d: da %x, qsz %d, align %d\n", |
249 | i, vring->da, vring->num, vring->align); | |
7a186941 | 250 | |
6db20ea8 OBC |
251 | /* make sure reserved bytes are zeroes */ |
252 | if (vring->reserved) { | |
253 | dev_err(dev, "vring rsc has non zero reserved bytes\n"); | |
254 | return -EINVAL; | |
255 | } | |
7a186941 | 256 | |
6db20ea8 OBC |
257 | /* verify queue size and vring alignment are sane */ |
258 | if (!vring->num || !vring->align) { | |
259 | dev_err(dev, "invalid qsz (%d) or alignment (%d)\n", | |
260 | vring->num, vring->align); | |
261 | return -EINVAL; | |
7a186941 | 262 | } |
6db20ea8 OBC |
263 | |
264 | rvring->len = vring->num; | |
265 | rvring->align = vring->align; | |
266 | rvring->rvdev = rvdev; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
099a3f33 SB |
271 | static int rproc_max_notifyid(int id, void *p, void *data) |
272 | { | |
273 | int *maxid = data; | |
274 | *maxid = max(*maxid, id); | |
275 | return 0; | |
276 | } | |
277 | ||
6db20ea8 OBC |
278 | void rproc_free_vring(struct rproc_vring *rvring) |
279 | { | |
280 | int size = PAGE_ALIGN(vring_size(rvring->len, rvring->align)); | |
281 | struct rproc *rproc = rvring->rvdev->rproc; | |
099a3f33 | 282 | int maxid = 0; |
6db20ea8 | 283 | |
b5ab5e24 | 284 | dma_free_coherent(rproc->dev.parent, size, rvring->va, rvring->dma); |
6db20ea8 | 285 | idr_remove(&rproc->notifyids, rvring->notifyid); |
099a3f33 SB |
286 | |
287 | /* Find the largest remaining notifyid */ | |
288 | idr_for_each(&rproc->notifyids, rproc_max_notifyid, &maxid); | |
289 | rproc->max_notifyid = maxid; | |
7a186941 OBC |
290 | } |
291 | ||
400e64df | 292 | /** |
fd2c15ec | 293 | * rproc_handle_vdev() - handle a vdev fw resource |
400e64df OBC |
294 | * @rproc: the remote processor |
295 | * @rsc: the vring resource descriptor | |
fd2c15ec | 296 | * @avail: size of available data (for sanity checking the image) |
400e64df | 297 | * |
7a186941 OBC |
298 | * This resource entry requests the host to statically register a virtio |
299 | * device (vdev), and setup everything needed to support it. It contains | |
300 | * everything needed to make it possible: the virtio device id, virtio | |
301 | * device features, vrings information, virtio config space, etc... | |
302 | * | |
303 | * Before registering the vdev, the vrings are allocated from non-cacheable | |
304 | * physically contiguous memory. Currently we only support two vrings per | |
305 | * remote processor (temporary limitation). We might also want to consider | |
306 | * doing the vring allocation only later when ->find_vqs() is invoked, and | |
307 | * then release them upon ->del_vqs(). | |
308 | * | |
309 | * Note: @da is currently not really handled correctly: we dynamically | |
310 | * allocate it using the DMA API, ignoring requested hard coded addresses, | |
311 | * and we don't take care of any required IOMMU programming. This is all | |
312 | * going to be taken care of when the generic iommu-based DMA API will be | |
313 | * merged. Meanwhile, statically-addressed iommu-based firmware images should | |
314 | * use RSC_DEVMEM resource entries to map their required @da to the physical | |
315 | * address of their base CMA region (ouch, hacky!). | |
400e64df OBC |
316 | * |
317 | * Returns 0 on success, or an appropriate error code otherwise | |
318 | */ | |
fd2c15ec OBC |
319 | static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, |
320 | int avail) | |
400e64df | 321 | { |
b5ab5e24 | 322 | struct device *dev = &rproc->dev; |
7a186941 OBC |
323 | struct rproc_vdev *rvdev; |
324 | int i, ret; | |
400e64df | 325 | |
fd2c15ec OBC |
326 | /* make sure resource isn't truncated */ |
327 | if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring) | |
328 | + rsc->config_len > avail) { | |
b5ab5e24 | 329 | dev_err(dev, "vdev rsc is truncated\n"); |
400e64df OBC |
330 | return -EINVAL; |
331 | } | |
332 | ||
fd2c15ec OBC |
333 | /* make sure reserved bytes are zeroes */ |
334 | if (rsc->reserved[0] || rsc->reserved[1]) { | |
335 | dev_err(dev, "vdev rsc has non zero reserved bytes\n"); | |
400e64df OBC |
336 | return -EINVAL; |
337 | } | |
338 | ||
fd2c15ec OBC |
339 | dev_dbg(dev, "vdev rsc: id %d, dfeatures %x, cfg len %d, %d vrings\n", |
340 | rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings); | |
341 | ||
7a186941 OBC |
342 | /* we currently support only two vrings per rvdev */ |
343 | if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) { | |
fd2c15ec | 344 | dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings); |
400e64df OBC |
345 | return -EINVAL; |
346 | } | |
347 | ||
7a186941 OBC |
348 | rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL); |
349 | if (!rvdev) | |
350 | return -ENOMEM; | |
400e64df | 351 | |
7a186941 | 352 | rvdev->rproc = rproc; |
400e64df | 353 | |
6db20ea8 | 354 | /* parse the vrings */ |
7a186941 | 355 | for (i = 0; i < rsc->num_of_vrings; i++) { |
6db20ea8 | 356 | ret = rproc_parse_vring(rvdev, rsc, i); |
7a186941 | 357 | if (ret) |
6db20ea8 | 358 | goto free_rvdev; |
7a186941 | 359 | } |
400e64df | 360 | |
7a186941 OBC |
361 | /* remember the device features */ |
362 | rvdev->dfeatures = rsc->dfeatures; | |
fd2c15ec | 363 | |
7a186941 | 364 | list_add_tail(&rvdev->node, &rproc->rvdevs); |
fd2c15ec | 365 | |
7a186941 OBC |
366 | /* it is now safe to add the virtio device */ |
367 | ret = rproc_add_virtio_dev(rvdev, rsc->id); | |
368 | if (ret) | |
6db20ea8 | 369 | goto free_rvdev; |
400e64df OBC |
370 | |
371 | return 0; | |
7a186941 | 372 | |
6db20ea8 | 373 | free_rvdev: |
7a186941 OBC |
374 | kfree(rvdev); |
375 | return ret; | |
400e64df OBC |
376 | } |
377 | ||
378 | /** | |
379 | * rproc_handle_trace() - handle a shared trace buffer resource | |
380 | * @rproc: the remote processor | |
381 | * @rsc: the trace resource descriptor | |
fd2c15ec | 382 | * @avail: size of available data (for sanity checking the image) |
400e64df OBC |
383 | * |
384 | * In case the remote processor dumps trace logs into memory, | |
385 | * export it via debugfs. | |
386 | * | |
387 | * Currently, the 'da' member of @rsc should contain the device address | |
388 | * where the remote processor is dumping the traces. Later we could also | |
389 | * support dynamically allocating this address using the generic | |
390 | * DMA API (but currently there isn't a use case for that). | |
391 | * | |
392 | * Returns 0 on success, or an appropriate error code otherwise | |
393 | */ | |
fd2c15ec OBC |
394 | static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc, |
395 | int avail) | |
400e64df OBC |
396 | { |
397 | struct rproc_mem_entry *trace; | |
b5ab5e24 | 398 | struct device *dev = &rproc->dev; |
400e64df OBC |
399 | void *ptr; |
400 | char name[15]; | |
401 | ||
fd2c15ec | 402 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 403 | dev_err(dev, "trace rsc is truncated\n"); |
fd2c15ec OBC |
404 | return -EINVAL; |
405 | } | |
406 | ||
407 | /* make sure reserved bytes are zeroes */ | |
408 | if (rsc->reserved) { | |
409 | dev_err(dev, "trace rsc has non zero reserved bytes\n"); | |
410 | return -EINVAL; | |
411 | } | |
412 | ||
400e64df OBC |
413 | /* what's the kernel address of this resource ? */ |
414 | ptr = rproc_da_to_va(rproc, rsc->da, rsc->len); | |
415 | if (!ptr) { | |
416 | dev_err(dev, "erroneous trace resource entry\n"); | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
420 | trace = kzalloc(sizeof(*trace), GFP_KERNEL); | |
421 | if (!trace) { | |
422 | dev_err(dev, "kzalloc trace failed\n"); | |
423 | return -ENOMEM; | |
424 | } | |
425 | ||
426 | /* set the trace buffer dma properties */ | |
427 | trace->len = rsc->len; | |
428 | trace->va = ptr; | |
429 | ||
430 | /* make sure snprintf always null terminates, even if truncating */ | |
431 | snprintf(name, sizeof(name), "trace%d", rproc->num_traces); | |
432 | ||
433 | /* create the debugfs entry */ | |
434 | trace->priv = rproc_create_trace_file(name, rproc, trace); | |
435 | if (!trace->priv) { | |
436 | trace->va = NULL; | |
437 | kfree(trace); | |
438 | return -EINVAL; | |
439 | } | |
440 | ||
441 | list_add_tail(&trace->node, &rproc->traces); | |
442 | ||
443 | rproc->num_traces++; | |
444 | ||
fd2c15ec | 445 | dev_dbg(dev, "%s added: va %p, da 0x%x, len 0x%x\n", name, ptr, |
400e64df OBC |
446 | rsc->da, rsc->len); |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | /** | |
452 | * rproc_handle_devmem() - handle devmem resource entry | |
453 | * @rproc: remote processor handle | |
454 | * @rsc: the devmem resource entry | |
fd2c15ec | 455 | * @avail: size of available data (for sanity checking the image) |
400e64df OBC |
456 | * |
457 | * Remote processors commonly need to access certain on-chip peripherals. | |
458 | * | |
459 | * Some of these remote processors access memory via an iommu device, | |
460 | * and might require us to configure their iommu before they can access | |
461 | * the on-chip peripherals they need. | |
462 | * | |
463 | * This resource entry is a request to map such a peripheral device. | |
464 | * | |
465 | * These devmem entries will contain the physical address of the device in | |
466 | * the 'pa' member. If a specific device address is expected, then 'da' will | |
467 | * contain it (currently this is the only use case supported). 'len' will | |
468 | * contain the size of the physical region we need to map. | |
469 | * | |
470 | * Currently we just "trust" those devmem entries to contain valid physical | |
471 | * addresses, but this is going to change: we want the implementations to | |
472 | * tell us ranges of physical addresses the firmware is allowed to request, | |
473 | * and not allow firmwares to request access to physical addresses that | |
474 | * are outside those ranges. | |
475 | */ | |
fd2c15ec OBC |
476 | static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc, |
477 | int avail) | |
400e64df OBC |
478 | { |
479 | struct rproc_mem_entry *mapping; | |
b5ab5e24 | 480 | struct device *dev = &rproc->dev; |
400e64df OBC |
481 | int ret; |
482 | ||
483 | /* no point in handling this resource without a valid iommu domain */ | |
484 | if (!rproc->domain) | |
485 | return -EINVAL; | |
486 | ||
fd2c15ec | 487 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 488 | dev_err(dev, "devmem rsc is truncated\n"); |
fd2c15ec OBC |
489 | return -EINVAL; |
490 | } | |
491 | ||
492 | /* make sure reserved bytes are zeroes */ | |
493 | if (rsc->reserved) { | |
b5ab5e24 | 494 | dev_err(dev, "devmem rsc has non zero reserved bytes\n"); |
fd2c15ec OBC |
495 | return -EINVAL; |
496 | } | |
497 | ||
400e64df OBC |
498 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); |
499 | if (!mapping) { | |
b5ab5e24 | 500 | dev_err(dev, "kzalloc mapping failed\n"); |
400e64df OBC |
501 | return -ENOMEM; |
502 | } | |
503 | ||
504 | ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags); | |
505 | if (ret) { | |
b5ab5e24 | 506 | dev_err(dev, "failed to map devmem: %d\n", ret); |
400e64df OBC |
507 | goto out; |
508 | } | |
509 | ||
510 | /* | |
511 | * We'll need this info later when we'll want to unmap everything | |
512 | * (e.g. on shutdown). | |
513 | * | |
514 | * We can't trust the remote processor not to change the resource | |
515 | * table, so we must maintain this info independently. | |
516 | */ | |
517 | mapping->da = rsc->da; | |
518 | mapping->len = rsc->len; | |
519 | list_add_tail(&mapping->node, &rproc->mappings); | |
520 | ||
b5ab5e24 | 521 | dev_dbg(dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n", |
400e64df OBC |
522 | rsc->pa, rsc->da, rsc->len); |
523 | ||
524 | return 0; | |
525 | ||
526 | out: | |
527 | kfree(mapping); | |
528 | return ret; | |
529 | } | |
530 | ||
531 | /** | |
532 | * rproc_handle_carveout() - handle phys contig memory allocation requests | |
533 | * @rproc: rproc handle | |
534 | * @rsc: the resource entry | |
fd2c15ec | 535 | * @avail: size of available data (for image validation) |
400e64df OBC |
536 | * |
537 | * This function will handle firmware requests for allocation of physically | |
538 | * contiguous memory regions. | |
539 | * | |
540 | * These request entries should come first in the firmware's resource table, | |
541 | * as other firmware entries might request placing other data objects inside | |
542 | * these memory regions (e.g. data/code segments, trace resource entries, ...). | |
543 | * | |
544 | * Allocating memory this way helps utilizing the reserved physical memory | |
545 | * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries | |
546 | * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB | |
547 | * pressure is important; it may have a substantial impact on performance. | |
548 | */ | |
fd2c15ec OBC |
549 | static int rproc_handle_carveout(struct rproc *rproc, |
550 | struct fw_rsc_carveout *rsc, int avail) | |
400e64df OBC |
551 | { |
552 | struct rproc_mem_entry *carveout, *mapping; | |
b5ab5e24 | 553 | struct device *dev = &rproc->dev; |
400e64df OBC |
554 | dma_addr_t dma; |
555 | void *va; | |
556 | int ret; | |
557 | ||
fd2c15ec | 558 | if (sizeof(*rsc) > avail) { |
b5ab5e24 | 559 | dev_err(dev, "carveout rsc is truncated\n"); |
fd2c15ec OBC |
560 | return -EINVAL; |
561 | } | |
562 | ||
563 | /* make sure reserved bytes are zeroes */ | |
564 | if (rsc->reserved) { | |
565 | dev_err(dev, "carveout rsc has non zero reserved bytes\n"); | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
569 | dev_dbg(dev, "carveout rsc: da %x, pa %x, len %x, flags %x\n", | |
570 | rsc->da, rsc->pa, rsc->len, rsc->flags); | |
571 | ||
400e64df OBC |
572 | carveout = kzalloc(sizeof(*carveout), GFP_KERNEL); |
573 | if (!carveout) { | |
574 | dev_err(dev, "kzalloc carveout failed\n"); | |
7168d914 | 575 | return -ENOMEM; |
400e64df OBC |
576 | } |
577 | ||
b5ab5e24 | 578 | va = dma_alloc_coherent(dev->parent, rsc->len, &dma, GFP_KERNEL); |
400e64df | 579 | if (!va) { |
b5ab5e24 | 580 | dev_err(dev->parent, "dma_alloc_coherent err: %d\n", rsc->len); |
400e64df OBC |
581 | ret = -ENOMEM; |
582 | goto free_carv; | |
583 | } | |
584 | ||
d09f53a7 EG |
585 | dev_dbg(dev, "carveout va %p, dma %llx, len 0x%x\n", va, |
586 | (unsigned long long)dma, rsc->len); | |
400e64df OBC |
587 | |
588 | /* | |
589 | * Ok, this is non-standard. | |
590 | * | |
591 | * Sometimes we can't rely on the generic iommu-based DMA API | |
592 | * to dynamically allocate the device address and then set the IOMMU | |
593 | * tables accordingly, because some remote processors might | |
594 | * _require_ us to use hard coded device addresses that their | |
595 | * firmware was compiled with. | |
596 | * | |
597 | * In this case, we must use the IOMMU API directly and map | |
598 | * the memory to the device address as expected by the remote | |
599 | * processor. | |
600 | * | |
601 | * Obviously such remote processor devices should not be configured | |
602 | * to use the iommu-based DMA API: we expect 'dma' to contain the | |
603 | * physical address in this case. | |
604 | */ | |
605 | if (rproc->domain) { | |
7168d914 DC |
606 | mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); |
607 | if (!mapping) { | |
608 | dev_err(dev, "kzalloc mapping failed\n"); | |
609 | ret = -ENOMEM; | |
610 | goto dma_free; | |
611 | } | |
612 | ||
400e64df OBC |
613 | ret = iommu_map(rproc->domain, rsc->da, dma, rsc->len, |
614 | rsc->flags); | |
615 | if (ret) { | |
616 | dev_err(dev, "iommu_map failed: %d\n", ret); | |
7168d914 | 617 | goto free_mapping; |
400e64df OBC |
618 | } |
619 | ||
620 | /* | |
621 | * We'll need this info later when we'll want to unmap | |
622 | * everything (e.g. on shutdown). | |
623 | * | |
624 | * We can't trust the remote processor not to change the | |
625 | * resource table, so we must maintain this info independently. | |
626 | */ | |
627 | mapping->da = rsc->da; | |
628 | mapping->len = rsc->len; | |
629 | list_add_tail(&mapping->node, &rproc->mappings); | |
630 | ||
d09f53a7 EG |
631 | dev_dbg(dev, "carveout mapped 0x%x to 0x%llx\n", |
632 | rsc->da, (unsigned long long)dma); | |
400e64df OBC |
633 | } |
634 | ||
0e49b72c OBC |
635 | /* |
636 | * Some remote processors might need to know the pa | |
637 | * even though they are behind an IOMMU. E.g., OMAP4's | |
638 | * remote M3 processor needs this so it can control | |
639 | * on-chip hardware accelerators that are not behind | |
640 | * the IOMMU, and therefor must know the pa. | |
641 | * | |
642 | * Generally we don't want to expose physical addresses | |
643 | * if we don't have to (remote processors are generally | |
644 | * _not_ trusted), so we might want to do this only for | |
645 | * remote processor that _must_ have this (e.g. OMAP4's | |
646 | * dual M3 subsystem). | |
647 | * | |
648 | * Non-IOMMU processors might also want to have this info. | |
649 | * In this case, the device address and the physical address | |
650 | * are the same. | |
651 | */ | |
652 | rsc->pa = dma; | |
653 | ||
400e64df OBC |
654 | carveout->va = va; |
655 | carveout->len = rsc->len; | |
656 | carveout->dma = dma; | |
657 | carveout->da = rsc->da; | |
658 | ||
659 | list_add_tail(&carveout->node, &rproc->carveouts); | |
660 | ||
661 | return 0; | |
662 | ||
7168d914 DC |
663 | free_mapping: |
664 | kfree(mapping); | |
400e64df | 665 | dma_free: |
b5ab5e24 | 666 | dma_free_coherent(dev->parent, rsc->len, va, dma); |
400e64df OBC |
667 | free_carv: |
668 | kfree(carveout); | |
400e64df OBC |
669 | return ret; |
670 | } | |
671 | ||
e12bc14b OBC |
672 | /* |
673 | * A lookup table for resource handlers. The indices are defined in | |
674 | * enum fw_resource_type. | |
675 | */ | |
676 | static rproc_handle_resource_t rproc_handle_rsc[] = { | |
fd2c15ec OBC |
677 | [RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout, |
678 | [RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem, | |
679 | [RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace, | |
7a186941 | 680 | [RSC_VDEV] = NULL, /* VDEVs were handled upon registrarion */ |
e12bc14b OBC |
681 | }; |
682 | ||
400e64df OBC |
683 | /* handle firmware resource entries before booting the remote processor */ |
684 | static int | |
fd2c15ec | 685 | rproc_handle_boot_rsc(struct rproc *rproc, struct resource_table *table, int len) |
400e64df | 686 | { |
b5ab5e24 | 687 | struct device *dev = &rproc->dev; |
e12bc14b | 688 | rproc_handle_resource_t handler; |
fd2c15ec OBC |
689 | int ret = 0, i; |
690 | ||
691 | for (i = 0; i < table->num; i++) { | |
692 | int offset = table->offset[i]; | |
693 | struct fw_rsc_hdr *hdr = (void *)table + offset; | |
694 | int avail = len - offset - sizeof(*hdr); | |
695 | void *rsc = (void *)hdr + sizeof(*hdr); | |
696 | ||
697 | /* make sure table isn't truncated */ | |
698 | if (avail < 0) { | |
699 | dev_err(dev, "rsc table is truncated\n"); | |
700 | return -EINVAL; | |
701 | } | |
400e64df | 702 | |
fd2c15ec | 703 | dev_dbg(dev, "rsc: type %d\n", hdr->type); |
400e64df | 704 | |
fd2c15ec OBC |
705 | if (hdr->type >= RSC_LAST) { |
706 | dev_warn(dev, "unsupported resource %d\n", hdr->type); | |
e12bc14b | 707 | continue; |
400e64df OBC |
708 | } |
709 | ||
fd2c15ec | 710 | handler = rproc_handle_rsc[hdr->type]; |
e12bc14b OBC |
711 | if (!handler) |
712 | continue; | |
713 | ||
fd2c15ec | 714 | ret = handler(rproc, rsc, avail); |
400e64df OBC |
715 | if (ret) |
716 | break; | |
400e64df OBC |
717 | } |
718 | ||
719 | return ret; | |
720 | } | |
721 | ||
722 | /* handle firmware resource entries while registering the remote processor */ | |
723 | static int | |
fd2c15ec | 724 | rproc_handle_virtio_rsc(struct rproc *rproc, struct resource_table *table, int len) |
400e64df | 725 | { |
b5ab5e24 | 726 | struct device *dev = &rproc->dev; |
fd2c15ec OBC |
727 | int ret = 0, i; |
728 | ||
729 | for (i = 0; i < table->num; i++) { | |
730 | int offset = table->offset[i]; | |
731 | struct fw_rsc_hdr *hdr = (void *)table + offset; | |
732 | int avail = len - offset - sizeof(*hdr); | |
7a186941 | 733 | struct fw_rsc_vdev *vrsc; |
400e64df | 734 | |
fd2c15ec OBC |
735 | /* make sure table isn't truncated */ |
736 | if (avail < 0) { | |
737 | dev_err(dev, "rsc table is truncated\n"); | |
738 | return -EINVAL; | |
739 | } | |
740 | ||
741 | dev_dbg(dev, "%s: rsc type %d\n", __func__, hdr->type); | |
742 | ||
7a186941 OBC |
743 | if (hdr->type != RSC_VDEV) |
744 | continue; | |
745 | ||
746 | vrsc = (struct fw_rsc_vdev *)hdr->data; | |
747 | ||
748 | ret = rproc_handle_vdev(rproc, vrsc, avail); | |
749 | if (ret) | |
400e64df | 750 | break; |
fd2c15ec | 751 | } |
400e64df OBC |
752 | |
753 | return ret; | |
754 | } | |
755 | ||
400e64df OBC |
756 | /** |
757 | * rproc_resource_cleanup() - clean up and free all acquired resources | |
758 | * @rproc: rproc handle | |
759 | * | |
760 | * This function will free all resources acquired for @rproc, and it | |
7a186941 | 761 | * is called whenever @rproc either shuts down or fails to boot. |
400e64df OBC |
762 | */ |
763 | static void rproc_resource_cleanup(struct rproc *rproc) | |
764 | { | |
765 | struct rproc_mem_entry *entry, *tmp; | |
b5ab5e24 | 766 | struct device *dev = &rproc->dev; |
400e64df OBC |
767 | |
768 | /* clean up debugfs trace entries */ | |
769 | list_for_each_entry_safe(entry, tmp, &rproc->traces, node) { | |
770 | rproc_remove_trace_file(entry->priv); | |
771 | rproc->num_traces--; | |
772 | list_del(&entry->node); | |
773 | kfree(entry); | |
774 | } | |
775 | ||
400e64df OBC |
776 | /* clean up carveout allocations */ |
777 | list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) { | |
b5ab5e24 | 778 | dma_free_coherent(dev->parent, entry->len, entry->va, entry->dma); |
400e64df OBC |
779 | list_del(&entry->node); |
780 | kfree(entry); | |
781 | } | |
782 | ||
783 | /* clean up iommu mapping entries */ | |
784 | list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) { | |
785 | size_t unmapped; | |
786 | ||
787 | unmapped = iommu_unmap(rproc->domain, entry->da, entry->len); | |
788 | if (unmapped != entry->len) { | |
789 | /* nothing much to do besides complaining */ | |
e981f6d4 | 790 | dev_err(dev, "failed to unmap %u/%zu\n", entry->len, |
400e64df OBC |
791 | unmapped); |
792 | } | |
793 | ||
794 | list_del(&entry->node); | |
795 | kfree(entry); | |
796 | } | |
797 | } | |
798 | ||
400e64df OBC |
799 | /* |
800 | * take a firmware and boot a remote processor with it. | |
801 | */ | |
802 | static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) | |
803 | { | |
b5ab5e24 | 804 | struct device *dev = &rproc->dev; |
400e64df | 805 | const char *name = rproc->firmware; |
1e3e2c7c OBC |
806 | struct resource_table *table; |
807 | int ret, tablesz; | |
400e64df OBC |
808 | |
809 | ret = rproc_fw_sanity_check(rproc, fw); | |
810 | if (ret) | |
811 | return ret; | |
812 | ||
e981f6d4 | 813 | dev_info(dev, "Booting fw image %s, size %zd\n", name, fw->size); |
400e64df OBC |
814 | |
815 | /* | |
816 | * if enabling an IOMMU isn't relevant for this rproc, this is | |
817 | * just a nop | |
818 | */ | |
819 | ret = rproc_enable_iommu(rproc); | |
820 | if (ret) { | |
821 | dev_err(dev, "can't enable iommu: %d\n", ret); | |
822 | return ret; | |
823 | } | |
824 | ||
3e5f9eb5 | 825 | rproc->bootaddr = rproc_get_boot_addr(rproc, fw); |
400e64df | 826 | |
1e3e2c7c | 827 | /* look for the resource table */ |
bd484984 | 828 | table = rproc_find_rsc_table(rproc, fw, &tablesz); |
30338cf0 SB |
829 | if (!table) { |
830 | ret = -EINVAL; | |
1e3e2c7c | 831 | goto clean_up; |
30338cf0 | 832 | } |
1e3e2c7c | 833 | |
400e64df | 834 | /* handle fw resources which are required to boot rproc */ |
1e3e2c7c | 835 | ret = rproc_handle_boot_rsc(rproc, table, tablesz); |
400e64df OBC |
836 | if (ret) { |
837 | dev_err(dev, "Failed to process resources: %d\n", ret); | |
838 | goto clean_up; | |
839 | } | |
840 | ||
841 | /* load the ELF segments to memory */ | |
bd484984 | 842 | ret = rproc_load_segments(rproc, fw); |
400e64df OBC |
843 | if (ret) { |
844 | dev_err(dev, "Failed to load program segments: %d\n", ret); | |
845 | goto clean_up; | |
846 | } | |
847 | ||
848 | /* power up the remote processor */ | |
849 | ret = rproc->ops->start(rproc); | |
850 | if (ret) { | |
851 | dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret); | |
852 | goto clean_up; | |
853 | } | |
854 | ||
855 | rproc->state = RPROC_RUNNING; | |
856 | ||
857 | dev_info(dev, "remote processor %s is now up\n", rproc->name); | |
858 | ||
859 | return 0; | |
860 | ||
861 | clean_up: | |
862 | rproc_resource_cleanup(rproc); | |
863 | rproc_disable_iommu(rproc); | |
864 | return ret; | |
865 | } | |
866 | ||
867 | /* | |
868 | * take a firmware and look for virtio devices to register. | |
869 | * | |
870 | * Note: this function is called asynchronously upon registration of the | |
871 | * remote processor (so we must wait until it completes before we try | |
872 | * to unregister the device. one other option is just to use kref here, | |
873 | * that might be cleaner). | |
874 | */ | |
875 | static void rproc_fw_config_virtio(const struct firmware *fw, void *context) | |
876 | { | |
877 | struct rproc *rproc = context; | |
1e3e2c7c OBC |
878 | struct resource_table *table; |
879 | int ret, tablesz; | |
400e64df OBC |
880 | |
881 | if (rproc_fw_sanity_check(rproc, fw) < 0) | |
882 | goto out; | |
883 | ||
1e3e2c7c | 884 | /* look for the resource table */ |
bd484984 | 885 | table = rproc_find_rsc_table(rproc, fw, &tablesz); |
1e3e2c7c OBC |
886 | if (!table) |
887 | goto out; | |
888 | ||
889 | /* look for virtio devices and register them */ | |
890 | ret = rproc_handle_virtio_rsc(rproc, table, tablesz); | |
891 | if (ret) | |
400e64df | 892 | goto out; |
400e64df | 893 | |
400e64df | 894 | out: |
3cc6e787 | 895 | release_firmware(fw); |
160e7c84 | 896 | /* allow rproc_del() contexts, if any, to proceed */ |
400e64df OBC |
897 | complete_all(&rproc->firmware_loading_complete); |
898 | } | |
899 | ||
70b85ef8 FGL |
900 | static int rproc_add_virtio_devices(struct rproc *rproc) |
901 | { | |
902 | int ret; | |
903 | ||
904 | /* rproc_del() calls must wait until async loader completes */ | |
905 | init_completion(&rproc->firmware_loading_complete); | |
906 | ||
907 | /* | |
908 | * We must retrieve early virtio configuration info from | |
909 | * the firmware (e.g. whether to register a virtio device, | |
910 | * what virtio features does it support, ...). | |
911 | * | |
912 | * We're initiating an asynchronous firmware loading, so we can | |
913 | * be built-in kernel code, without hanging the boot process. | |
914 | */ | |
915 | ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG, | |
916 | rproc->firmware, &rproc->dev, GFP_KERNEL, | |
917 | rproc, rproc_fw_config_virtio); | |
918 | if (ret < 0) { | |
919 | dev_err(&rproc->dev, "request_firmware_nowait err: %d\n", ret); | |
920 | complete_all(&rproc->firmware_loading_complete); | |
921 | } | |
922 | ||
923 | return ret; | |
924 | } | |
925 | ||
926 | /** | |
927 | * rproc_trigger_recovery() - recover a remoteproc | |
928 | * @rproc: the remote processor | |
929 | * | |
930 | * The recovery is done by reseting all the virtio devices, that way all the | |
931 | * rpmsg drivers will be reseted along with the remote processor making the | |
932 | * remoteproc functional again. | |
933 | * | |
934 | * This function can sleep, so it cannot be called from atomic context. | |
935 | */ | |
936 | int rproc_trigger_recovery(struct rproc *rproc) | |
937 | { | |
938 | struct rproc_vdev *rvdev, *rvtmp; | |
939 | ||
940 | dev_err(&rproc->dev, "recovering %s\n", rproc->name); | |
941 | ||
942 | init_completion(&rproc->crash_comp); | |
943 | ||
944 | /* clean up remote vdev entries */ | |
945 | list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node) | |
946 | rproc_remove_virtio_dev(rvdev); | |
947 | ||
948 | /* wait until there is no more rproc users */ | |
949 | wait_for_completion(&rproc->crash_comp); | |
950 | ||
951 | return rproc_add_virtio_devices(rproc); | |
952 | } | |
953 | ||
8afd519c FGL |
954 | /** |
955 | * rproc_crash_handler_work() - handle a crash | |
956 | * | |
957 | * This function needs to handle everything related to a crash, like cpu | |
958 | * registers and stack dump, information to help to debug the fatal error, etc. | |
959 | */ | |
960 | static void rproc_crash_handler_work(struct work_struct *work) | |
961 | { | |
962 | struct rproc *rproc = container_of(work, struct rproc, crash_handler); | |
963 | struct device *dev = &rproc->dev; | |
964 | ||
965 | dev_dbg(dev, "enter %s\n", __func__); | |
966 | ||
967 | mutex_lock(&rproc->lock); | |
968 | ||
969 | if (rproc->state == RPROC_CRASHED || rproc->state == RPROC_OFFLINE) { | |
970 | /* handle only the first crash detected */ | |
971 | mutex_unlock(&rproc->lock); | |
972 | return; | |
973 | } | |
974 | ||
975 | rproc->state = RPROC_CRASHED; | |
976 | dev_err(dev, "handling crash #%u in %s\n", ++rproc->crash_cnt, | |
977 | rproc->name); | |
978 | ||
979 | mutex_unlock(&rproc->lock); | |
980 | ||
2e37abb8 FGL |
981 | if (!rproc->recovery_disabled) |
982 | rproc_trigger_recovery(rproc); | |
8afd519c FGL |
983 | } |
984 | ||
400e64df OBC |
985 | /** |
986 | * rproc_boot() - boot a remote processor | |
987 | * @rproc: handle of a remote processor | |
988 | * | |
989 | * Boot a remote processor (i.e. load its firmware, power it on, ...). | |
990 | * | |
991 | * If the remote processor is already powered on, this function immediately | |
992 | * returns (successfully). | |
993 | * | |
994 | * Returns 0 on success, and an appropriate error value otherwise. | |
995 | */ | |
996 | int rproc_boot(struct rproc *rproc) | |
997 | { | |
998 | const struct firmware *firmware_p; | |
999 | struct device *dev; | |
1000 | int ret; | |
1001 | ||
1002 | if (!rproc) { | |
1003 | pr_err("invalid rproc handle\n"); | |
1004 | return -EINVAL; | |
1005 | } | |
1006 | ||
b5ab5e24 | 1007 | dev = &rproc->dev; |
400e64df OBC |
1008 | |
1009 | ret = mutex_lock_interruptible(&rproc->lock); | |
1010 | if (ret) { | |
1011 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); | |
1012 | return ret; | |
1013 | } | |
1014 | ||
1015 | /* loading a firmware is required */ | |
1016 | if (!rproc->firmware) { | |
1017 | dev_err(dev, "%s: no firmware to load\n", __func__); | |
1018 | ret = -EINVAL; | |
1019 | goto unlock_mutex; | |
1020 | } | |
1021 | ||
1022 | /* prevent underlying implementation from being removed */ | |
b5ab5e24 | 1023 | if (!try_module_get(dev->parent->driver->owner)) { |
400e64df OBC |
1024 | dev_err(dev, "%s: can't get owner\n", __func__); |
1025 | ret = -EINVAL; | |
1026 | goto unlock_mutex; | |
1027 | } | |
1028 | ||
1029 | /* skip the boot process if rproc is already powered up */ | |
1030 | if (atomic_inc_return(&rproc->power) > 1) { | |
1031 | ret = 0; | |
1032 | goto unlock_mutex; | |
1033 | } | |
1034 | ||
1035 | dev_info(dev, "powering up %s\n", rproc->name); | |
1036 | ||
1037 | /* load firmware */ | |
1038 | ret = request_firmware(&firmware_p, rproc->firmware, dev); | |
1039 | if (ret < 0) { | |
1040 | dev_err(dev, "request_firmware failed: %d\n", ret); | |
1041 | goto downref_rproc; | |
1042 | } | |
1043 | ||
1044 | ret = rproc_fw_boot(rproc, firmware_p); | |
1045 | ||
1046 | release_firmware(firmware_p); | |
1047 | ||
1048 | downref_rproc: | |
1049 | if (ret) { | |
b5ab5e24 | 1050 | module_put(dev->parent->driver->owner); |
400e64df OBC |
1051 | atomic_dec(&rproc->power); |
1052 | } | |
1053 | unlock_mutex: | |
1054 | mutex_unlock(&rproc->lock); | |
1055 | return ret; | |
1056 | } | |
1057 | EXPORT_SYMBOL(rproc_boot); | |
1058 | ||
1059 | /** | |
1060 | * rproc_shutdown() - power off the remote processor | |
1061 | * @rproc: the remote processor | |
1062 | * | |
1063 | * Power off a remote processor (previously booted with rproc_boot()). | |
1064 | * | |
1065 | * In case @rproc is still being used by an additional user(s), then | |
1066 | * this function will just decrement the power refcount and exit, | |
1067 | * without really powering off the device. | |
1068 | * | |
1069 | * Every call to rproc_boot() must (eventually) be accompanied by a call | |
1070 | * to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug. | |
1071 | * | |
1072 | * Notes: | |
1073 | * - we're not decrementing the rproc's refcount, only the power refcount. | |
1074 | * which means that the @rproc handle stays valid even after rproc_shutdown() | |
1075 | * returns, and users can still use it with a subsequent rproc_boot(), if | |
1076 | * needed. | |
400e64df OBC |
1077 | */ |
1078 | void rproc_shutdown(struct rproc *rproc) | |
1079 | { | |
b5ab5e24 | 1080 | struct device *dev = &rproc->dev; |
400e64df OBC |
1081 | int ret; |
1082 | ||
1083 | ret = mutex_lock_interruptible(&rproc->lock); | |
1084 | if (ret) { | |
1085 | dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); | |
1086 | return; | |
1087 | } | |
1088 | ||
1089 | /* if the remote proc is still needed, bail out */ | |
1090 | if (!atomic_dec_and_test(&rproc->power)) | |
1091 | goto out; | |
1092 | ||
1093 | /* power off the remote processor */ | |
1094 | ret = rproc->ops->stop(rproc); | |
1095 | if (ret) { | |
1096 | atomic_inc(&rproc->power); | |
1097 | dev_err(dev, "can't stop rproc: %d\n", ret); | |
1098 | goto out; | |
1099 | } | |
1100 | ||
1101 | /* clean up all acquired resources */ | |
1102 | rproc_resource_cleanup(rproc); | |
1103 | ||
1104 | rproc_disable_iommu(rproc); | |
1105 | ||
70b85ef8 FGL |
1106 | /* if in crash state, unlock crash handler */ |
1107 | if (rproc->state == RPROC_CRASHED) | |
1108 | complete_all(&rproc->crash_comp); | |
1109 | ||
400e64df OBC |
1110 | rproc->state = RPROC_OFFLINE; |
1111 | ||
1112 | dev_info(dev, "stopped remote processor %s\n", rproc->name); | |
1113 | ||
1114 | out: | |
1115 | mutex_unlock(&rproc->lock); | |
1116 | if (!ret) | |
b5ab5e24 | 1117 | module_put(dev->parent->driver->owner); |
400e64df OBC |
1118 | } |
1119 | EXPORT_SYMBOL(rproc_shutdown); | |
1120 | ||
1121 | /** | |
160e7c84 | 1122 | * rproc_add() - register a remote processor |
400e64df OBC |
1123 | * @rproc: the remote processor handle to register |
1124 | * | |
1125 | * Registers @rproc with the remoteproc framework, after it has been | |
1126 | * allocated with rproc_alloc(). | |
1127 | * | |
1128 | * This is called by the platform-specific rproc implementation, whenever | |
1129 | * a new remote processor device is probed. | |
1130 | * | |
1131 | * Returns 0 on success and an appropriate error code otherwise. | |
1132 | * | |
1133 | * Note: this function initiates an asynchronous firmware loading | |
1134 | * context, which will look for virtio devices supported by the rproc's | |
1135 | * firmware. | |
1136 | * | |
1137 | * If found, those virtio devices will be created and added, so as a result | |
7a186941 | 1138 | * of registering this remote processor, additional virtio drivers might be |
400e64df | 1139 | * probed. |
400e64df | 1140 | */ |
160e7c84 | 1141 | int rproc_add(struct rproc *rproc) |
400e64df | 1142 | { |
b5ab5e24 | 1143 | struct device *dev = &rproc->dev; |
70b85ef8 | 1144 | int ret; |
400e64df | 1145 | |
b5ab5e24 OBC |
1146 | ret = device_add(dev); |
1147 | if (ret < 0) | |
1148 | return ret; | |
400e64df | 1149 | |
b5ab5e24 | 1150 | dev_info(dev, "%s is available\n", rproc->name); |
400e64df | 1151 | |
489d129a OBC |
1152 | dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n"); |
1153 | dev_info(dev, "THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.\n"); | |
1154 | ||
400e64df OBC |
1155 | /* create debugfs entries */ |
1156 | rproc_create_debug_dir(rproc); | |
1157 | ||
70b85ef8 | 1158 | return rproc_add_virtio_devices(rproc); |
400e64df | 1159 | } |
160e7c84 | 1160 | EXPORT_SYMBOL(rproc_add); |
400e64df | 1161 | |
b5ab5e24 OBC |
1162 | /** |
1163 | * rproc_type_release() - release a remote processor instance | |
1164 | * @dev: the rproc's device | |
1165 | * | |
1166 | * This function should _never_ be called directly. | |
1167 | * | |
1168 | * It will be called by the driver core when no one holds a valid pointer | |
1169 | * to @dev anymore. | |
1170 | */ | |
1171 | static void rproc_type_release(struct device *dev) | |
1172 | { | |
1173 | struct rproc *rproc = container_of(dev, struct rproc, dev); | |
1174 | ||
7183a2a7 OBC |
1175 | dev_info(&rproc->dev, "releasing %s\n", rproc->name); |
1176 | ||
1177 | rproc_delete_debug_dir(rproc); | |
1178 | ||
b5ab5e24 OBC |
1179 | idr_destroy(&rproc->notifyids); |
1180 | ||
1181 | if (rproc->index >= 0) | |
1182 | ida_simple_remove(&rproc_dev_index, rproc->index); | |
1183 | ||
1184 | kfree(rproc); | |
1185 | } | |
1186 | ||
1187 | static struct device_type rproc_type = { | |
1188 | .name = "remoteproc", | |
1189 | .release = rproc_type_release, | |
1190 | }; | |
400e64df OBC |
1191 | |
1192 | /** | |
1193 | * rproc_alloc() - allocate a remote processor handle | |
1194 | * @dev: the underlying device | |
1195 | * @name: name of this remote processor | |
1196 | * @ops: platform-specific handlers (mainly start/stop) | |
1197 | * @firmware: name of firmware file to load | |
1198 | * @len: length of private data needed by the rproc driver (in bytes) | |
1199 | * | |
1200 | * Allocates a new remote processor handle, but does not register | |
1201 | * it yet. | |
1202 | * | |
1203 | * This function should be used by rproc implementations during initialization | |
1204 | * of the remote processor. | |
1205 | * | |
1206 | * After creating an rproc handle using this function, and when ready, | |
160e7c84 | 1207 | * implementations should then call rproc_add() to complete |
400e64df OBC |
1208 | * the registration of the remote processor. |
1209 | * | |
1210 | * On success the new rproc is returned, and on failure, NULL. | |
1211 | * | |
1212 | * Note: _never_ directly deallocate @rproc, even if it was not registered | |
160e7c84 | 1213 | * yet. Instead, when you need to unroll rproc_alloc(), use rproc_put(). |
400e64df OBC |
1214 | */ |
1215 | struct rproc *rproc_alloc(struct device *dev, const char *name, | |
1216 | const struct rproc_ops *ops, | |
1217 | const char *firmware, int len) | |
1218 | { | |
1219 | struct rproc *rproc; | |
1220 | ||
1221 | if (!dev || !name || !ops) | |
1222 | return NULL; | |
1223 | ||
1224 | rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL); | |
1225 | if (!rproc) { | |
1226 | dev_err(dev, "%s: kzalloc failed\n", __func__); | |
1227 | return NULL; | |
1228 | } | |
1229 | ||
400e64df OBC |
1230 | rproc->name = name; |
1231 | rproc->ops = ops; | |
1232 | rproc->firmware = firmware; | |
1233 | rproc->priv = &rproc[1]; | |
1234 | ||
b5ab5e24 OBC |
1235 | device_initialize(&rproc->dev); |
1236 | rproc->dev.parent = dev; | |
1237 | rproc->dev.type = &rproc_type; | |
1238 | ||
1239 | /* Assign a unique device index and name */ | |
1240 | rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL); | |
1241 | if (rproc->index < 0) { | |
1242 | dev_err(dev, "ida_simple_get failed: %d\n", rproc->index); | |
1243 | put_device(&rproc->dev); | |
1244 | return NULL; | |
1245 | } | |
1246 | ||
1247 | dev_set_name(&rproc->dev, "remoteproc%d", rproc->index); | |
1248 | ||
400e64df OBC |
1249 | atomic_set(&rproc->power, 0); |
1250 | ||
4afc89d6 SB |
1251 | /* Set ELF as the default fw_ops handler */ |
1252 | rproc->fw_ops = &rproc_elf_fw_ops; | |
400e64df OBC |
1253 | |
1254 | mutex_init(&rproc->lock); | |
1255 | ||
7a186941 OBC |
1256 | idr_init(&rproc->notifyids); |
1257 | ||
400e64df OBC |
1258 | INIT_LIST_HEAD(&rproc->carveouts); |
1259 | INIT_LIST_HEAD(&rproc->mappings); | |
1260 | INIT_LIST_HEAD(&rproc->traces); | |
7a186941 | 1261 | INIT_LIST_HEAD(&rproc->rvdevs); |
400e64df | 1262 | |
8afd519c | 1263 | INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work); |
70b85ef8 | 1264 | init_completion(&rproc->crash_comp); |
8afd519c | 1265 | |
400e64df OBC |
1266 | rproc->state = RPROC_OFFLINE; |
1267 | ||
1268 | return rproc; | |
1269 | } | |
1270 | EXPORT_SYMBOL(rproc_alloc); | |
1271 | ||
1272 | /** | |
160e7c84 | 1273 | * rproc_put() - unroll rproc_alloc() |
400e64df OBC |
1274 | * @rproc: the remote processor handle |
1275 | * | |
c6b5a276 | 1276 | * This function decrements the rproc dev refcount. |
400e64df | 1277 | * |
c6b5a276 OBC |
1278 | * If no one holds any reference to rproc anymore, then its refcount would |
1279 | * now drop to zero, and it would be freed. | |
400e64df | 1280 | */ |
160e7c84 | 1281 | void rproc_put(struct rproc *rproc) |
400e64df | 1282 | { |
b5ab5e24 | 1283 | put_device(&rproc->dev); |
400e64df | 1284 | } |
160e7c84 | 1285 | EXPORT_SYMBOL(rproc_put); |
400e64df OBC |
1286 | |
1287 | /** | |
160e7c84 | 1288 | * rproc_del() - unregister a remote processor |
400e64df OBC |
1289 | * @rproc: rproc handle to unregister |
1290 | * | |
400e64df OBC |
1291 | * This function should be called when the platform specific rproc |
1292 | * implementation decides to remove the rproc device. it should | |
160e7c84 | 1293 | * _only_ be called if a previous invocation of rproc_add() |
400e64df OBC |
1294 | * has completed successfully. |
1295 | * | |
160e7c84 | 1296 | * After rproc_del() returns, @rproc isn't freed yet, because |
c6b5a276 | 1297 | * of the outstanding reference created by rproc_alloc. To decrement that |
160e7c84 | 1298 | * one last refcount, one still needs to call rproc_put(). |
400e64df OBC |
1299 | * |
1300 | * Returns 0 on success and -EINVAL if @rproc isn't valid. | |
1301 | */ | |
160e7c84 | 1302 | int rproc_del(struct rproc *rproc) |
400e64df | 1303 | { |
6db20ea8 | 1304 | struct rproc_vdev *rvdev, *tmp; |
7a186941 | 1305 | |
400e64df OBC |
1306 | if (!rproc) |
1307 | return -EINVAL; | |
1308 | ||
1309 | /* if rproc is just being registered, wait */ | |
1310 | wait_for_completion(&rproc->firmware_loading_complete); | |
1311 | ||
7a186941 | 1312 | /* clean up remote vdev entries */ |
6db20ea8 | 1313 | list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node) |
7a186941 | 1314 | rproc_remove_virtio_dev(rvdev); |
400e64df | 1315 | |
b5ab5e24 | 1316 | device_del(&rproc->dev); |
400e64df OBC |
1317 | |
1318 | return 0; | |
1319 | } | |
160e7c84 | 1320 | EXPORT_SYMBOL(rproc_del); |
400e64df | 1321 | |
8afd519c FGL |
1322 | /** |
1323 | * rproc_report_crash() - rproc crash reporter function | |
1324 | * @rproc: remote processor | |
1325 | * @type: crash type | |
1326 | * | |
1327 | * This function must be called every time a crash is detected by the low-level | |
1328 | * drivers implementing a specific remoteproc. This should not be called from a | |
1329 | * non-remoteproc driver. | |
1330 | * | |
1331 | * This function can be called from atomic/interrupt context. | |
1332 | */ | |
1333 | void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type) | |
1334 | { | |
1335 | if (!rproc) { | |
1336 | pr_err("NULL rproc pointer\n"); | |
1337 | return; | |
1338 | } | |
1339 | ||
1340 | dev_err(&rproc->dev, "crash detected in %s: type %s\n", | |
1341 | rproc->name, rproc_crash_to_string(type)); | |
1342 | ||
1343 | /* create a new task to handle the error */ | |
1344 | schedule_work(&rproc->crash_handler); | |
1345 | } | |
1346 | EXPORT_SYMBOL(rproc_report_crash); | |
1347 | ||
400e64df OBC |
1348 | static int __init remoteproc_init(void) |
1349 | { | |
1350 | rproc_init_debugfs(); | |
b5ab5e24 | 1351 | |
400e64df OBC |
1352 | return 0; |
1353 | } | |
1354 | module_init(remoteproc_init); | |
1355 | ||
1356 | static void __exit remoteproc_exit(void) | |
1357 | { | |
1358 | rproc_exit_debugfs(); | |
1359 | } | |
1360 | module_exit(remoteproc_exit); | |
1361 | ||
1362 | MODULE_LICENSE("GPL v2"); | |
1363 | MODULE_DESCRIPTION("Generic Remote Processor Framework"); |