xref: /linux/drivers/remoteproc/qcom_common.c (revision 3d0fe49454652117522f60bfbefb978ba0e5300b) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Qualcomm Peripheral Image Loader helpers
4  *
5  * Copyright (C) 2016 Linaro Ltd
6  * Copyright (C) 2015 Sony Mobile Communications Inc
7  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
8  */
9 
10 #include <linux/firmware.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/notifier.h>
14 #include <linux/remoteproc.h>
15 #include <linux/remoteproc/qcom_rproc.h>
16 #include <linux/rpmsg/qcom_glink.h>
17 #include <linux/rpmsg/qcom_smd.h>
18 #include <linux/slab.h>
19 #include <linux/soc/qcom/mdt_loader.h>
20 #include <linux/soc/qcom/smem.h>
21 
22 #include "remoteproc_internal.h"
23 #include "qcom_common.h"
24 
25 #define to_glink_subdev(d) container_of(d, struct qcom_rproc_glink, subdev)
26 #define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
27 #define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
28 
29 #define MAX_NUM_OF_SS           10
30 #define MAX_REGION_NAME_LENGTH  16
31 #define SBL_MINIDUMP_SMEM_ID	602
32 #define MINIDUMP_REGION_VALID		('V' << 24 | 'A' << 16 | 'L' << 8 | 'I' << 0)
33 #define MINIDUMP_SS_ENCR_DONE		('D' << 24 | 'O' << 16 | 'N' << 8 | 'E' << 0)
34 #define MINIDUMP_SS_ENABLED		('E' << 24 | 'N' << 16 | 'B' << 8 | 'L' << 0)
35 
36 /**
37  * struct minidump_region - Minidump region
38  * @name		: Name of the region to be dumped
39  * @seq_num:		: Use to differentiate regions with same name.
40  * @valid		: This entry to be dumped (if set to 1)
41  * @address		: Physical address of region to be dumped
42  * @size		: Size of the region
43  */
44 struct minidump_region {
45 	char	name[MAX_REGION_NAME_LENGTH];
46 	__le32	seq_num;
47 	__le32	valid;
48 	__le64	address;
49 	__le64	size;
50 };
51 
52 /**
53  * struct minidump_subsystem - Subsystem's SMEM Table of content
54  * @status : Subsystem toc init status
55  * @enabled : if set to 1, this region would be copied during coredump
56  * @encryption_status: Encryption status for this subsystem
57  * @encryption_required : Decides to encrypt the subsystem regions or not
58  * @region_count : Number of regions added in this subsystem toc
59  * @regions_baseptr : regions base pointer of the subsystem
60  */
61 struct minidump_subsystem {
62 	__le32	status;
63 	__le32	enabled;
64 	__le32	encryption_status;
65 	__le32	encryption_required;
66 	__le32	region_count;
67 	__le64	regions_baseptr;
68 };
69 
70 /**
71  * struct minidump_global_toc - Global Table of Content
72  * @status : Global Minidump init status
73  * @md_revision : Minidump revision
74  * @enabled : Minidump enable status
75  * @subsystems : Array of subsystems toc
76  */
77 struct minidump_global_toc {
78 	__le32				status;
79 	__le32				md_revision;
80 	__le32				enabled;
81 	struct minidump_subsystem	subsystems[MAX_NUM_OF_SS];
82 };
83 
84 struct qcom_ssr_subsystem {
85 	const char *name;
86 	struct srcu_notifier_head notifier_list;
87 	struct list_head list;
88 };
89 
90 static LIST_HEAD(qcom_ssr_subsystem_list);
91 static DEFINE_MUTEX(qcom_ssr_subsys_lock);
92 
93 static void qcom_minidump_cleanup(struct rproc *rproc)
94 {
95 	struct rproc_dump_segment *entry, *tmp;
96 
97 	list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
98 		list_del(&entry->node);
99 		kfree(entry->priv);
100 		kfree(entry);
101 	}
102 }
103 
104 static int qcom_add_minidump_segments(struct rproc *rproc, struct minidump_subsystem *subsystem,
105 			void (*rproc_dumpfn_t)(struct rproc *rproc, struct rproc_dump_segment *segment,
106 				void *dest, size_t offset, size_t size))
107 {
108 	struct minidump_region __iomem *ptr;
109 	struct minidump_region region;
110 	int seg_cnt, i;
111 	dma_addr_t da;
112 	size_t size;
113 	char *name;
114 
115 	if (WARN_ON(!list_empty(&rproc->dump_segments))) {
116 		dev_err(&rproc->dev, "dump segment list already populated\n");
117 		return -EUCLEAN;
118 	}
119 
120 	seg_cnt = le32_to_cpu(subsystem->region_count);
121 	ptr = ioremap((unsigned long)le64_to_cpu(subsystem->regions_baseptr),
122 		      seg_cnt * sizeof(struct minidump_region));
123 	if (!ptr)
124 		return -EFAULT;
125 
126 	for (i = 0; i < seg_cnt; i++) {
127 		memcpy_fromio(&region, ptr + i, sizeof(region));
128 		if (le32_to_cpu(region.valid) == MINIDUMP_REGION_VALID) {
129 			name = kstrndup(region.name, MAX_REGION_NAME_LENGTH - 1, GFP_KERNEL);
130 			if (!name) {
131 				iounmap(ptr);
132 				return -ENOMEM;
133 			}
134 			da = le64_to_cpu(region.address);
135 			size = le64_to_cpu(region.size);
136 			rproc_coredump_add_custom_segment(rproc, da, size, rproc_dumpfn_t, name);
137 		}
138 	}
139 
140 	iounmap(ptr);
141 	return 0;
142 }
143 
144 void qcom_minidump(struct rproc *rproc, unsigned int minidump_id,
145 		void (*rproc_dumpfn_t)(struct rproc *rproc,
146 		struct rproc_dump_segment *segment, void *dest, size_t offset,
147 		size_t size))
148 {
149 	int ret;
150 	struct minidump_subsystem *subsystem;
151 	struct minidump_global_toc *toc;
152 
153 	/* Get Global minidump ToC*/
154 	toc = qcom_smem_get(QCOM_SMEM_HOST_ANY, SBL_MINIDUMP_SMEM_ID, NULL);
155 
156 	/* check if global table pointer exists and init is set */
157 	if (IS_ERR(toc) || !toc->status) {
158 		dev_err(&rproc->dev, "Minidump TOC not found in SMEM\n");
159 		return;
160 	}
161 
162 	/* Get subsystem table of contents using the minidump id */
163 	subsystem = &toc->subsystems[minidump_id];
164 
165 	/**
166 	 * Collect minidump if SS ToC is valid and segment table
167 	 * is initialized in memory and encryption status is set.
168 	 */
169 	if (subsystem->regions_baseptr == 0 ||
170 	    le32_to_cpu(subsystem->status) != 1 ||
171 	    le32_to_cpu(subsystem->enabled) != MINIDUMP_SS_ENABLED) {
172 		return rproc_coredump(rproc);
173 	}
174 
175 	if (le32_to_cpu(subsystem->encryption_status) != MINIDUMP_SS_ENCR_DONE) {
176 		dev_err(&rproc->dev, "Minidump not ready, skipping\n");
177 		return;
178 	}
179 
180 	/**
181 	 * Clear out the dump segments populated by parse_fw before
182 	 * re-populating them with minidump segments.
183 	 */
184 	rproc_coredump_cleanup(rproc);
185 
186 	ret = qcom_add_minidump_segments(rproc, subsystem, rproc_dumpfn_t);
187 	if (ret) {
188 		dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret);
189 		goto clean_minidump;
190 	}
191 	rproc_coredump_using_sections(rproc);
192 clean_minidump:
193 	qcom_minidump_cleanup(rproc);
194 }
195 EXPORT_SYMBOL_GPL(qcom_minidump);
196 
197 static int glink_subdev_start(struct rproc_subdev *subdev)
198 {
199 	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
200 
201 	glink->edge = qcom_glink_smem_register(glink->dev, glink->node);
202 
203 	return PTR_ERR_OR_ZERO(glink->edge);
204 }
205 
206 static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed)
207 {
208 	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
209 
210 	qcom_glink_smem_unregister(glink->edge);
211 	glink->edge = NULL;
212 }
213 
214 static void glink_subdev_unprepare(struct rproc_subdev *subdev)
215 {
216 	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
217 
218 	qcom_glink_ssr_notify(glink->ssr_name);
219 }
220 
221 /**
222  * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
223  * @rproc:	rproc handle to parent the subdevice
224  * @glink:	reference to a GLINK subdev context
225  * @ssr_name:	identifier of the associated remoteproc for ssr notifications
226  */
227 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
228 			   const char *ssr_name)
229 {
230 	struct device *dev = &rproc->dev;
231 
232 	glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge");
233 	if (!glink->node)
234 		return;
235 
236 	glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
237 	if (!glink->ssr_name)
238 		return;
239 
240 	glink->dev = dev;
241 	glink->subdev.start = glink_subdev_start;
242 	glink->subdev.stop = glink_subdev_stop;
243 	glink->subdev.unprepare = glink_subdev_unprepare;
244 
245 	rproc_add_subdev(rproc, &glink->subdev);
246 }
247 EXPORT_SYMBOL_GPL(qcom_add_glink_subdev);
248 
249 /**
250  * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc
251  * @rproc:	rproc handle
252  * @glink:	reference to a GLINK subdev context
253  */
254 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
255 {
256 	if (!glink->node)
257 		return;
258 
259 	rproc_remove_subdev(rproc, &glink->subdev);
260 	kfree_const(glink->ssr_name);
261 	of_node_put(glink->node);
262 }
263 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
264 
265 /**
266  * qcom_register_dump_segments() - register segments for coredump
267  * @rproc:	remoteproc handle
268  * @fw:		firmware header
269  *
270  * Register all segments of the ELF in the remoteproc coredump segment list
271  *
272  * Return: 0 on success, negative errno on failure.
273  */
274 int qcom_register_dump_segments(struct rproc *rproc,
275 				const struct firmware *fw)
276 {
277 	const struct elf32_phdr *phdrs;
278 	const struct elf32_phdr *phdr;
279 	const struct elf32_hdr *ehdr;
280 	int ret;
281 	int i;
282 
283 	ehdr = (struct elf32_hdr *)fw->data;
284 	phdrs = (struct elf32_phdr *)(ehdr + 1);
285 
286 	for (i = 0; i < ehdr->e_phnum; i++) {
287 		phdr = &phdrs[i];
288 
289 		if (phdr->p_type != PT_LOAD)
290 			continue;
291 
292 		if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
293 			continue;
294 
295 		if (!phdr->p_memsz)
296 			continue;
297 
298 		ret = rproc_coredump_add_segment(rproc, phdr->p_paddr,
299 						 phdr->p_memsz);
300 		if (ret)
301 			return ret;
302 	}
303 
304 	return 0;
305 }
306 EXPORT_SYMBOL_GPL(qcom_register_dump_segments);
307 
308 static int smd_subdev_start(struct rproc_subdev *subdev)
309 {
310 	struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
311 
312 	smd->edge = qcom_smd_register_edge(smd->dev, smd->node);
313 
314 	return PTR_ERR_OR_ZERO(smd->edge);
315 }
316 
317 static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed)
318 {
319 	struct qcom_rproc_subdev *smd = to_smd_subdev(subdev);
320 
321 	qcom_smd_unregister_edge(smd->edge);
322 	smd->edge = NULL;
323 }
324 
325 /**
326  * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc
327  * @rproc:	rproc handle to parent the subdevice
328  * @smd:	reference to a Qualcomm subdev context
329  */
330 void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
331 {
332 	struct device *dev = &rproc->dev;
333 
334 	smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge");
335 	if (!smd->node)
336 		return;
337 
338 	smd->dev = dev;
339 	smd->subdev.start = smd_subdev_start;
340 	smd->subdev.stop = smd_subdev_stop;
341 
342 	rproc_add_subdev(rproc, &smd->subdev);
343 }
344 EXPORT_SYMBOL_GPL(qcom_add_smd_subdev);
345 
346 /**
347  * qcom_remove_smd_subdev() - remove the smd subdevice from rproc
348  * @rproc:	rproc handle
349  * @smd:	the SMD subdevice to remove
350  */
351 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd)
352 {
353 	if (!smd->node)
354 		return;
355 
356 	rproc_remove_subdev(rproc, &smd->subdev);
357 	of_node_put(smd->node);
358 }
359 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
360 
361 static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name)
362 {
363 	struct qcom_ssr_subsystem *info;
364 
365 	mutex_lock(&qcom_ssr_subsys_lock);
366 	/* Match in the global qcom_ssr_subsystem_list with name */
367 	list_for_each_entry(info, &qcom_ssr_subsystem_list, list)
368 		if (!strcmp(info->name, name))
369 			goto out;
370 
371 	info = kzalloc(sizeof(*info), GFP_KERNEL);
372 	if (!info) {
373 		info = ERR_PTR(-ENOMEM);
374 		goto out;
375 	}
376 	info->name = kstrdup_const(name, GFP_KERNEL);
377 	srcu_init_notifier_head(&info->notifier_list);
378 
379 	/* Add to global notification list */
380 	list_add_tail(&info->list, &qcom_ssr_subsystem_list);
381 
382 out:
383 	mutex_unlock(&qcom_ssr_subsys_lock);
384 	return info;
385 }
386 
387 /**
388  * qcom_register_ssr_notifier() - register SSR notification handler
389  * @name:	Subsystem's SSR name
390  * @nb:		notifier_block to be invoked upon subsystem's state change
391  *
392  * This registers the @nb notifier block as part the notifier chain for a
393  * remoteproc associated with @name. The notifier block's callback
394  * will be invoked when the remote processor's SSR events occur
395  * (pre/post startup and pre/post shutdown).
396  *
397  * Return: a subsystem cookie on success, ERR_PTR on failure.
398  */
399 void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb)
400 {
401 	struct qcom_ssr_subsystem *info;
402 
403 	info = qcom_ssr_get_subsys(name);
404 	if (IS_ERR(info))
405 		return info;
406 
407 	srcu_notifier_chain_register(&info->notifier_list, nb);
408 
409 	return &info->notifier_list;
410 }
411 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
412 
413 /**
414  * qcom_unregister_ssr_notifier() - unregister SSR notification handler
415  * @notify:	subsystem cookie returned from qcom_register_ssr_notifier
416  * @nb:		notifier_block to unregister
417  *
418  * This function will unregister the notifier from the particular notifier
419  * chain.
420  *
421  * Return: 0 on success, %ENOENT otherwise.
422  */
423 int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
424 {
425 	return srcu_notifier_chain_unregister(notify, nb);
426 }
427 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
428 
429 static int ssr_notify_prepare(struct rproc_subdev *subdev)
430 {
431 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
432 	struct qcom_ssr_notify_data data = {
433 		.name = ssr->info->name,
434 		.crashed = false,
435 	};
436 
437 	srcu_notifier_call_chain(&ssr->info->notifier_list,
438 				 QCOM_SSR_BEFORE_POWERUP, &data);
439 	return 0;
440 }
441 
442 static int ssr_notify_start(struct rproc_subdev *subdev)
443 {
444 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
445 	struct qcom_ssr_notify_data data = {
446 		.name = ssr->info->name,
447 		.crashed = false,
448 	};
449 
450 	srcu_notifier_call_chain(&ssr->info->notifier_list,
451 				 QCOM_SSR_AFTER_POWERUP, &data);
452 	return 0;
453 }
454 
455 static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
456 {
457 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
458 	struct qcom_ssr_notify_data data = {
459 		.name = ssr->info->name,
460 		.crashed = crashed,
461 	};
462 
463 	srcu_notifier_call_chain(&ssr->info->notifier_list,
464 				 QCOM_SSR_BEFORE_SHUTDOWN, &data);
465 }
466 
467 static void ssr_notify_unprepare(struct rproc_subdev *subdev)
468 {
469 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
470 	struct qcom_ssr_notify_data data = {
471 		.name = ssr->info->name,
472 		.crashed = false,
473 	};
474 
475 	srcu_notifier_call_chain(&ssr->info->notifier_list,
476 				 QCOM_SSR_AFTER_SHUTDOWN, &data);
477 }
478 
479 /**
480  * qcom_add_ssr_subdev() - register subdevice as restart notification source
481  * @rproc:	rproc handle
482  * @ssr:	SSR subdevice handle
483  * @ssr_name:	identifier to use for notifications originating from @rproc
484  *
485  * As the @ssr is registered with the @rproc SSR events will be sent to all
486  * registered listeners for the remoteproc when it's SSR events occur
487  * (pre/post startup and pre/post shutdown).
488  */
489 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
490 			 const char *ssr_name)
491 {
492 	struct qcom_ssr_subsystem *info;
493 
494 	info = qcom_ssr_get_subsys(ssr_name);
495 	if (IS_ERR(info)) {
496 		dev_err(&rproc->dev, "Failed to add ssr subdevice\n");
497 		return;
498 	}
499 
500 	ssr->info = info;
501 	ssr->subdev.prepare = ssr_notify_prepare;
502 	ssr->subdev.start = ssr_notify_start;
503 	ssr->subdev.stop = ssr_notify_stop;
504 	ssr->subdev.unprepare = ssr_notify_unprepare;
505 
506 	rproc_add_subdev(rproc, &ssr->subdev);
507 }
508 EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev);
509 
510 /**
511  * qcom_remove_ssr_subdev() - remove subdevice as restart notification source
512  * @rproc:	rproc handle
513  * @ssr:	SSR subdevice handle
514  */
515 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
516 {
517 	rproc_remove_subdev(rproc, &ssr->subdev);
518 	ssr->info = NULL;
519 }
520 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
521 
522 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver");
523 MODULE_LICENSE("GPL v2");
524