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 MD_REGION_VALID ('V' << 24 | 'A' << 16 | 'L' << 8 | 'I' << 0) 33 #define MD_SS_ENCR_DONE ('D' << 24 | 'O' << 16 | 'N' << 8 | 'E' << 0) 34 #define MD_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 { 106 struct minidump_region __iomem *ptr; 107 struct minidump_region region; 108 int seg_cnt, i; 109 dma_addr_t da; 110 size_t size; 111 char *name; 112 113 if (WARN_ON(!list_empty(&rproc->dump_segments))) { 114 dev_err(&rproc->dev, "dump segment list already populated\n"); 115 return -EUCLEAN; 116 } 117 118 seg_cnt = le32_to_cpu(subsystem->region_count); 119 ptr = ioremap((unsigned long)le64_to_cpu(subsystem->regions_baseptr), 120 seg_cnt * sizeof(struct minidump_region)); 121 if (!ptr) 122 return -EFAULT; 123 124 for (i = 0; i < seg_cnt; i++) { 125 memcpy_fromio(®ion, ptr + i, sizeof(region)); 126 if (region.valid == MD_REGION_VALID) { 127 name = kstrdup(region.name, GFP_KERNEL); 128 if (!name) { 129 iounmap(ptr); 130 return -ENOMEM; 131 } 132 da = le64_to_cpu(region.address); 133 size = le32_to_cpu(region.size); 134 rproc_coredump_add_custom_segment(rproc, da, size, NULL, name); 135 } 136 } 137 138 iounmap(ptr); 139 return 0; 140 } 141 142 void qcom_minidump(struct rproc *rproc, unsigned int minidump_id) 143 { 144 int ret; 145 struct minidump_subsystem *subsystem; 146 struct minidump_global_toc *toc; 147 148 /* Get Global minidump ToC*/ 149 toc = qcom_smem_get(QCOM_SMEM_HOST_ANY, SBL_MINIDUMP_SMEM_ID, NULL); 150 151 /* check if global table pointer exists and init is set */ 152 if (IS_ERR(toc) || !toc->status) { 153 dev_err(&rproc->dev, "Minidump TOC not found in SMEM\n"); 154 return; 155 } 156 157 /* Get subsystem table of contents using the minidump id */ 158 subsystem = &toc->subsystems[minidump_id]; 159 160 /** 161 * Collect minidump if SS ToC is valid and segment table 162 * is initialized in memory and encryption status is set. 163 */ 164 if (subsystem->regions_baseptr == 0 || 165 le32_to_cpu(subsystem->status) != 1 || 166 le32_to_cpu(subsystem->enabled) != MD_SS_ENABLED || 167 le32_to_cpu(subsystem->encryption_status) != MD_SS_ENCR_DONE) { 168 dev_err(&rproc->dev, "Minidump not ready, skipping\n"); 169 return; 170 } 171 172 ret = qcom_add_minidump_segments(rproc, subsystem); 173 if (ret) { 174 dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret); 175 goto clean_minidump; 176 } 177 rproc_coredump_using_sections(rproc); 178 clean_minidump: 179 qcom_minidump_cleanup(rproc); 180 } 181 EXPORT_SYMBOL_GPL(qcom_minidump); 182 183 static int glink_subdev_start(struct rproc_subdev *subdev) 184 { 185 struct qcom_rproc_glink *glink = to_glink_subdev(subdev); 186 187 glink->edge = qcom_glink_smem_register(glink->dev, glink->node); 188 189 return PTR_ERR_OR_ZERO(glink->edge); 190 } 191 192 static void glink_subdev_stop(struct rproc_subdev *subdev, bool crashed) 193 { 194 struct qcom_rproc_glink *glink = to_glink_subdev(subdev); 195 196 qcom_glink_smem_unregister(glink->edge); 197 glink->edge = NULL; 198 } 199 200 static void glink_subdev_unprepare(struct rproc_subdev *subdev) 201 { 202 struct qcom_rproc_glink *glink = to_glink_subdev(subdev); 203 204 qcom_glink_ssr_notify(glink->ssr_name); 205 } 206 207 /** 208 * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc 209 * @rproc: rproc handle to parent the subdevice 210 * @glink: reference to a GLINK subdev context 211 * @ssr_name: identifier of the associated remoteproc for ssr notifications 212 */ 213 void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink, 214 const char *ssr_name) 215 { 216 struct device *dev = &rproc->dev; 217 218 glink->node = of_get_child_by_name(dev->parent->of_node, "glink-edge"); 219 if (!glink->node) 220 return; 221 222 glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL); 223 if (!glink->ssr_name) 224 return; 225 226 glink->dev = dev; 227 glink->subdev.start = glink_subdev_start; 228 glink->subdev.stop = glink_subdev_stop; 229 glink->subdev.unprepare = glink_subdev_unprepare; 230 231 rproc_add_subdev(rproc, &glink->subdev); 232 } 233 EXPORT_SYMBOL_GPL(qcom_add_glink_subdev); 234 235 /** 236 * qcom_remove_glink_subdev() - remove a GLINK subdevice from rproc 237 * @rproc: rproc handle 238 * @glink: reference to a GLINK subdev context 239 */ 240 void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink) 241 { 242 if (!glink->node) 243 return; 244 245 rproc_remove_subdev(rproc, &glink->subdev); 246 kfree_const(glink->ssr_name); 247 of_node_put(glink->node); 248 } 249 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev); 250 251 /** 252 * qcom_register_dump_segments() - register segments for coredump 253 * @rproc: remoteproc handle 254 * @fw: firmware header 255 * 256 * Register all segments of the ELF in the remoteproc coredump segment list 257 * 258 * Return: 0 on success, negative errno on failure. 259 */ 260 int qcom_register_dump_segments(struct rproc *rproc, 261 const struct firmware *fw) 262 { 263 const struct elf32_phdr *phdrs; 264 const struct elf32_phdr *phdr; 265 const struct elf32_hdr *ehdr; 266 int ret; 267 int i; 268 269 ehdr = (struct elf32_hdr *)fw->data; 270 phdrs = (struct elf32_phdr *)(ehdr + 1); 271 272 for (i = 0; i < ehdr->e_phnum; i++) { 273 phdr = &phdrs[i]; 274 275 if (phdr->p_type != PT_LOAD) 276 continue; 277 278 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH) 279 continue; 280 281 if (!phdr->p_memsz) 282 continue; 283 284 ret = rproc_coredump_add_segment(rproc, phdr->p_paddr, 285 phdr->p_memsz); 286 if (ret) 287 return ret; 288 } 289 290 return 0; 291 } 292 EXPORT_SYMBOL_GPL(qcom_register_dump_segments); 293 294 static int smd_subdev_start(struct rproc_subdev *subdev) 295 { 296 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev); 297 298 smd->edge = qcom_smd_register_edge(smd->dev, smd->node); 299 300 return PTR_ERR_OR_ZERO(smd->edge); 301 } 302 303 static void smd_subdev_stop(struct rproc_subdev *subdev, bool crashed) 304 { 305 struct qcom_rproc_subdev *smd = to_smd_subdev(subdev); 306 307 qcom_smd_unregister_edge(smd->edge); 308 smd->edge = NULL; 309 } 310 311 /** 312 * qcom_add_smd_subdev() - try to add a SMD subdevice to rproc 313 * @rproc: rproc handle to parent the subdevice 314 * @smd: reference to a Qualcomm subdev context 315 */ 316 void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd) 317 { 318 struct device *dev = &rproc->dev; 319 320 smd->node = of_get_child_by_name(dev->parent->of_node, "smd-edge"); 321 if (!smd->node) 322 return; 323 324 smd->dev = dev; 325 smd->subdev.start = smd_subdev_start; 326 smd->subdev.stop = smd_subdev_stop; 327 328 rproc_add_subdev(rproc, &smd->subdev); 329 } 330 EXPORT_SYMBOL_GPL(qcom_add_smd_subdev); 331 332 /** 333 * qcom_remove_smd_subdev() - remove the smd subdevice from rproc 334 * @rproc: rproc handle 335 * @smd: the SMD subdevice to remove 336 */ 337 void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd) 338 { 339 if (!smd->node) 340 return; 341 342 rproc_remove_subdev(rproc, &smd->subdev); 343 of_node_put(smd->node); 344 } 345 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev); 346 347 static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name) 348 { 349 struct qcom_ssr_subsystem *info; 350 351 mutex_lock(&qcom_ssr_subsys_lock); 352 /* Match in the global qcom_ssr_subsystem_list with name */ 353 list_for_each_entry(info, &qcom_ssr_subsystem_list, list) 354 if (!strcmp(info->name, name)) 355 goto out; 356 357 info = kzalloc(sizeof(*info), GFP_KERNEL); 358 if (!info) { 359 info = ERR_PTR(-ENOMEM); 360 goto out; 361 } 362 info->name = kstrdup_const(name, GFP_KERNEL); 363 srcu_init_notifier_head(&info->notifier_list); 364 365 /* Add to global notification list */ 366 list_add_tail(&info->list, &qcom_ssr_subsystem_list); 367 368 out: 369 mutex_unlock(&qcom_ssr_subsys_lock); 370 return info; 371 } 372 373 /** 374 * qcom_register_ssr_notifier() - register SSR notification handler 375 * @name: Subsystem's SSR name 376 * @nb: notifier_block to be invoked upon subsystem's state change 377 * 378 * This registers the @nb notifier block as part the notifier chain for a 379 * remoteproc associated with @name. The notifier block's callback 380 * will be invoked when the remote processor's SSR events occur 381 * (pre/post startup and pre/post shutdown). 382 * 383 * Return: a subsystem cookie on success, ERR_PTR on failure. 384 */ 385 void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb) 386 { 387 struct qcom_ssr_subsystem *info; 388 389 info = qcom_ssr_get_subsys(name); 390 if (IS_ERR(info)) 391 return info; 392 393 srcu_notifier_chain_register(&info->notifier_list, nb); 394 395 return &info->notifier_list; 396 } 397 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier); 398 399 /** 400 * qcom_unregister_ssr_notifier() - unregister SSR notification handler 401 * @notify: subsystem cookie returned from qcom_register_ssr_notifier 402 * @nb: notifier_block to unregister 403 * 404 * This function will unregister the notifier from the particular notifier 405 * chain. 406 * 407 * Return: 0 on success, %ENOENT otherwise. 408 */ 409 int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb) 410 { 411 return srcu_notifier_chain_unregister(notify, nb); 412 } 413 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier); 414 415 static int ssr_notify_prepare(struct rproc_subdev *subdev) 416 { 417 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); 418 struct qcom_ssr_notify_data data = { 419 .name = ssr->info->name, 420 .crashed = false, 421 }; 422 423 srcu_notifier_call_chain(&ssr->info->notifier_list, 424 QCOM_SSR_BEFORE_POWERUP, &data); 425 return 0; 426 } 427 428 static int ssr_notify_start(struct rproc_subdev *subdev) 429 { 430 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); 431 struct qcom_ssr_notify_data data = { 432 .name = ssr->info->name, 433 .crashed = false, 434 }; 435 436 srcu_notifier_call_chain(&ssr->info->notifier_list, 437 QCOM_SSR_AFTER_POWERUP, &data); 438 return 0; 439 } 440 441 static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed) 442 { 443 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); 444 struct qcom_ssr_notify_data data = { 445 .name = ssr->info->name, 446 .crashed = crashed, 447 }; 448 449 srcu_notifier_call_chain(&ssr->info->notifier_list, 450 QCOM_SSR_BEFORE_SHUTDOWN, &data); 451 } 452 453 static void ssr_notify_unprepare(struct rproc_subdev *subdev) 454 { 455 struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev); 456 struct qcom_ssr_notify_data data = { 457 .name = ssr->info->name, 458 .crashed = false, 459 }; 460 461 srcu_notifier_call_chain(&ssr->info->notifier_list, 462 QCOM_SSR_AFTER_SHUTDOWN, &data); 463 } 464 465 /** 466 * qcom_add_ssr_subdev() - register subdevice as restart notification source 467 * @rproc: rproc handle 468 * @ssr: SSR subdevice handle 469 * @ssr_name: identifier to use for notifications originating from @rproc 470 * 471 * As the @ssr is registered with the @rproc SSR events will be sent to all 472 * registered listeners for the remoteproc when it's SSR events occur 473 * (pre/post startup and pre/post shutdown). 474 */ 475 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr, 476 const char *ssr_name) 477 { 478 struct qcom_ssr_subsystem *info; 479 480 info = qcom_ssr_get_subsys(ssr_name); 481 if (IS_ERR(info)) { 482 dev_err(&rproc->dev, "Failed to add ssr subdevice\n"); 483 return; 484 } 485 486 ssr->info = info; 487 ssr->subdev.prepare = ssr_notify_prepare; 488 ssr->subdev.start = ssr_notify_start; 489 ssr->subdev.stop = ssr_notify_stop; 490 ssr->subdev.unprepare = ssr_notify_unprepare; 491 492 rproc_add_subdev(rproc, &ssr->subdev); 493 } 494 EXPORT_SYMBOL_GPL(qcom_add_ssr_subdev); 495 496 /** 497 * qcom_remove_ssr_subdev() - remove subdevice as restart notification source 498 * @rproc: rproc handle 499 * @ssr: SSR subdevice handle 500 */ 501 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr) 502 { 503 rproc_remove_subdev(rproc, &ssr->subdev); 504 ssr->info = NULL; 505 } 506 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev); 507 508 MODULE_DESCRIPTION("Qualcomm Remoteproc helper driver"); 509 MODULE_LICENSE("GPL v2"); 510