1c7e64b9cSStewart Smith /* 2c7e64b9cSStewart Smith * PowerNV OPAL Dump Interface 3c7e64b9cSStewart Smith * 4c7e64b9cSStewart Smith * Copyright 2013,2014 IBM Corp. 5c7e64b9cSStewart Smith * 6c7e64b9cSStewart Smith * This program is free software; you can redistribute it and/or 7c7e64b9cSStewart Smith * modify it under the terms of the GNU General Public License 8c7e64b9cSStewart Smith * as published by the Free Software Foundation; either version 9c7e64b9cSStewart Smith * 2 of the License, or (at your option) any later version. 10c7e64b9cSStewart Smith */ 11c7e64b9cSStewart Smith 12c7e64b9cSStewart Smith #include <linux/kobject.h> 13c7e64b9cSStewart Smith #include <linux/mm.h> 14c7e64b9cSStewart Smith #include <linux/slab.h> 15c7e64b9cSStewart Smith #include <linux/vmalloc.h> 16c7e64b9cSStewart Smith #include <linux/pagemap.h> 17c7e64b9cSStewart Smith #include <linux/delay.h> 18c7e64b9cSStewart Smith 19c7e64b9cSStewart Smith #include <asm/opal.h> 20c7e64b9cSStewart Smith 21c7e64b9cSStewart Smith #define DUMP_TYPE_FSP 0x01 22c7e64b9cSStewart Smith 23c7e64b9cSStewart Smith struct dump_obj { 24c7e64b9cSStewart Smith struct kobject kobj; 25c7e64b9cSStewart Smith struct bin_attribute dump_attr; 26c7e64b9cSStewart Smith uint32_t id; /* becomes object name */ 27c7e64b9cSStewart Smith uint32_t type; 28c7e64b9cSStewart Smith uint32_t size; 29c7e64b9cSStewart Smith char *buffer; 30c7e64b9cSStewart Smith }; 31c7e64b9cSStewart Smith #define to_dump_obj(x) container_of(x, struct dump_obj, kobj) 32c7e64b9cSStewart Smith 33c7e64b9cSStewart Smith struct dump_attribute { 34c7e64b9cSStewart Smith struct attribute attr; 35c7e64b9cSStewart Smith ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr, 36c7e64b9cSStewart Smith char *buf); 37c7e64b9cSStewart Smith ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr, 38c7e64b9cSStewart Smith const char *buf, size_t count); 39c7e64b9cSStewart Smith }; 40c7e64b9cSStewart Smith #define to_dump_attr(x) container_of(x, struct dump_attribute, attr) 41c7e64b9cSStewart Smith 42c7e64b9cSStewart Smith static ssize_t dump_id_show(struct dump_obj *dump_obj, 43c7e64b9cSStewart Smith struct dump_attribute *attr, 44c7e64b9cSStewart Smith char *buf) 45c7e64b9cSStewart Smith { 46c7e64b9cSStewart Smith return sprintf(buf, "0x%x\n", dump_obj->id); 47c7e64b9cSStewart Smith } 48c7e64b9cSStewart Smith 49c7e64b9cSStewart Smith static const char* dump_type_to_string(uint32_t type) 50c7e64b9cSStewart Smith { 51c7e64b9cSStewart Smith switch (type) { 52c7e64b9cSStewart Smith case 0x01: return "SP Dump"; 53c7e64b9cSStewart Smith case 0x02: return "System/Platform Dump"; 54c7e64b9cSStewart Smith case 0x03: return "SMA Dump"; 55c7e64b9cSStewart Smith default: return "unknown"; 56c7e64b9cSStewart Smith } 57c7e64b9cSStewart Smith } 58c7e64b9cSStewart Smith 59c7e64b9cSStewart Smith static ssize_t dump_type_show(struct dump_obj *dump_obj, 60c7e64b9cSStewart Smith struct dump_attribute *attr, 61c7e64b9cSStewart Smith char *buf) 62c7e64b9cSStewart Smith { 63c7e64b9cSStewart Smith 64c7e64b9cSStewart Smith return sprintf(buf, "0x%x %s\n", dump_obj->type, 65c7e64b9cSStewart Smith dump_type_to_string(dump_obj->type)); 66c7e64b9cSStewart Smith } 67c7e64b9cSStewart Smith 68c7e64b9cSStewart Smith static ssize_t dump_ack_show(struct dump_obj *dump_obj, 69c7e64b9cSStewart Smith struct dump_attribute *attr, 70c7e64b9cSStewart Smith char *buf) 71c7e64b9cSStewart Smith { 72c7e64b9cSStewart Smith return sprintf(buf, "ack - acknowledge dump\n"); 73c7e64b9cSStewart Smith } 74c7e64b9cSStewart Smith 75c7e64b9cSStewart Smith /* 76c7e64b9cSStewart Smith * Send acknowledgement to OPAL 77c7e64b9cSStewart Smith */ 78c7e64b9cSStewart Smith static int64_t dump_send_ack(uint32_t dump_id) 79c7e64b9cSStewart Smith { 80c7e64b9cSStewart Smith int rc; 81c7e64b9cSStewart Smith 82c7e64b9cSStewart Smith rc = opal_dump_ack(dump_id); 83c7e64b9cSStewart Smith if (rc) 84c7e64b9cSStewart Smith pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n", 85c7e64b9cSStewart Smith __func__, dump_id, rc); 86c7e64b9cSStewart Smith return rc; 87c7e64b9cSStewart Smith } 88c7e64b9cSStewart Smith 89c7e64b9cSStewart Smith static ssize_t dump_ack_store(struct dump_obj *dump_obj, 90c7e64b9cSStewart Smith struct dump_attribute *attr, 91c7e64b9cSStewart Smith const char *buf, 92c7e64b9cSStewart Smith size_t count) 93c7e64b9cSStewart Smith { 94c7e64b9cSStewart Smith dump_send_ack(dump_obj->id); 95cc4f265aSStewart Smith sysfs_remove_file_self(&dump_obj->kobj, &attr->attr); 96cc4f265aSStewart Smith kobject_put(&dump_obj->kobj); 97c7e64b9cSStewart Smith return count; 98c7e64b9cSStewart Smith } 99c7e64b9cSStewart Smith 100c7e64b9cSStewart Smith /* Attributes of a dump 101c7e64b9cSStewart Smith * The binary attribute of the dump itself is dynamic 102c7e64b9cSStewart Smith * due to the dynamic size of the dump 103c7e64b9cSStewart Smith */ 104c7e64b9cSStewart Smith static struct dump_attribute id_attribute = 105c7e64b9cSStewart Smith __ATTR(id, 0666, dump_id_show, NULL); 106c7e64b9cSStewart Smith static struct dump_attribute type_attribute = 107c7e64b9cSStewart Smith __ATTR(type, 0666, dump_type_show, NULL); 108c7e64b9cSStewart Smith static struct dump_attribute ack_attribute = 109c7e64b9cSStewart Smith __ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store); 110c7e64b9cSStewart Smith 111c7e64b9cSStewart Smith static ssize_t init_dump_show(struct dump_obj *dump_obj, 112c7e64b9cSStewart Smith struct dump_attribute *attr, 113c7e64b9cSStewart Smith char *buf) 114c7e64b9cSStewart Smith { 115c7e64b9cSStewart Smith return sprintf(buf, "1 - initiate dump\n"); 116c7e64b9cSStewart Smith } 117c7e64b9cSStewart Smith 118c7e64b9cSStewart Smith static int64_t dump_fips_init(uint8_t type) 119c7e64b9cSStewart Smith { 120c7e64b9cSStewart Smith int rc; 121c7e64b9cSStewart Smith 122c7e64b9cSStewart Smith rc = opal_dump_init(type); 123c7e64b9cSStewart Smith if (rc) 124c7e64b9cSStewart Smith pr_warn("%s: Failed to initiate FipS dump (%d)\n", 125c7e64b9cSStewart Smith __func__, rc); 126c7e64b9cSStewart Smith return rc; 127c7e64b9cSStewart Smith } 128c7e64b9cSStewart Smith 129c7e64b9cSStewart Smith static ssize_t init_dump_store(struct dump_obj *dump_obj, 130c7e64b9cSStewart Smith struct dump_attribute *attr, 131c7e64b9cSStewart Smith const char *buf, 132c7e64b9cSStewart Smith size_t count) 133c7e64b9cSStewart Smith { 134c7e64b9cSStewart Smith dump_fips_init(DUMP_TYPE_FSP); 135c7e64b9cSStewart Smith pr_info("%s: Initiated FSP dump\n", __func__); 136c7e64b9cSStewart Smith return count; 137c7e64b9cSStewart Smith } 138c7e64b9cSStewart Smith 139c7e64b9cSStewart Smith static struct dump_attribute initiate_attribute = 140c7e64b9cSStewart Smith __ATTR(initiate_dump, 0600, init_dump_show, init_dump_store); 141c7e64b9cSStewart Smith 142c7e64b9cSStewart Smith static struct attribute *initiate_attrs[] = { 143c7e64b9cSStewart Smith &initiate_attribute.attr, 144c7e64b9cSStewart Smith NULL, 145c7e64b9cSStewart Smith }; 146c7e64b9cSStewart Smith 147c7e64b9cSStewart Smith static struct attribute_group initiate_attr_group = { 148c7e64b9cSStewart Smith .attrs = initiate_attrs, 149c7e64b9cSStewart Smith }; 150c7e64b9cSStewart Smith 151c7e64b9cSStewart Smith static struct kset *dump_kset; 152c7e64b9cSStewart Smith 153c7e64b9cSStewart Smith static ssize_t dump_attr_show(struct kobject *kobj, 154c7e64b9cSStewart Smith struct attribute *attr, 155c7e64b9cSStewart Smith char *buf) 156c7e64b9cSStewart Smith { 157c7e64b9cSStewart Smith struct dump_attribute *attribute; 158c7e64b9cSStewart Smith struct dump_obj *dump; 159c7e64b9cSStewart Smith 160c7e64b9cSStewart Smith attribute = to_dump_attr(attr); 161c7e64b9cSStewart Smith dump = to_dump_obj(kobj); 162c7e64b9cSStewart Smith 163c7e64b9cSStewart Smith if (!attribute->show) 164c7e64b9cSStewart Smith return -EIO; 165c7e64b9cSStewart Smith 166c7e64b9cSStewart Smith return attribute->show(dump, attribute, buf); 167c7e64b9cSStewart Smith } 168c7e64b9cSStewart Smith 169c7e64b9cSStewart Smith static ssize_t dump_attr_store(struct kobject *kobj, 170c7e64b9cSStewart Smith struct attribute *attr, 171c7e64b9cSStewart Smith const char *buf, size_t len) 172c7e64b9cSStewart Smith { 173c7e64b9cSStewart Smith struct dump_attribute *attribute; 174c7e64b9cSStewart Smith struct dump_obj *dump; 175c7e64b9cSStewart Smith 176c7e64b9cSStewart Smith attribute = to_dump_attr(attr); 177c7e64b9cSStewart Smith dump = to_dump_obj(kobj); 178c7e64b9cSStewart Smith 179c7e64b9cSStewart Smith if (!attribute->store) 180c7e64b9cSStewart Smith return -EIO; 181c7e64b9cSStewart Smith 182c7e64b9cSStewart Smith return attribute->store(dump, attribute, buf, len); 183c7e64b9cSStewart Smith } 184c7e64b9cSStewart Smith 185c7e64b9cSStewart Smith static const struct sysfs_ops dump_sysfs_ops = { 186c7e64b9cSStewart Smith .show = dump_attr_show, 187c7e64b9cSStewart Smith .store = dump_attr_store, 188c7e64b9cSStewart Smith }; 189c7e64b9cSStewart Smith 190c7e64b9cSStewart Smith static void dump_release(struct kobject *kobj) 191c7e64b9cSStewart Smith { 192c7e64b9cSStewart Smith struct dump_obj *dump; 193c7e64b9cSStewart Smith 194c7e64b9cSStewart Smith dump = to_dump_obj(kobj); 195c7e64b9cSStewart Smith vfree(dump->buffer); 196c7e64b9cSStewart Smith kfree(dump); 197c7e64b9cSStewart Smith } 198c7e64b9cSStewart Smith 199c7e64b9cSStewart Smith static struct attribute *dump_default_attrs[] = { 200c7e64b9cSStewart Smith &id_attribute.attr, 201c7e64b9cSStewart Smith &type_attribute.attr, 202c7e64b9cSStewart Smith &ack_attribute.attr, 203c7e64b9cSStewart Smith NULL, 204c7e64b9cSStewart Smith }; 205c7e64b9cSStewart Smith 206c7e64b9cSStewart Smith static struct kobj_type dump_ktype = { 207c7e64b9cSStewart Smith .sysfs_ops = &dump_sysfs_ops, 208c7e64b9cSStewart Smith .release = &dump_release, 209c7e64b9cSStewart Smith .default_attrs = dump_default_attrs, 210c7e64b9cSStewart Smith }; 211c7e64b9cSStewart Smith 2122d6b63bbSAnton Blanchard static int64_t dump_read_info(uint32_t *dump_id, uint32_t *dump_size, uint32_t *dump_type) 213c7e64b9cSStewart Smith { 2142d6b63bbSAnton Blanchard __be32 id, size, type; 215c7e64b9cSStewart Smith int rc; 216c7e64b9cSStewart Smith 2172d6b63bbSAnton Blanchard type = cpu_to_be32(0xffffffff); 218c7e64b9cSStewart Smith 2192d6b63bbSAnton Blanchard rc = opal_dump_info2(&id, &size, &type); 220c7e64b9cSStewart Smith if (rc == OPAL_PARAMETER) 2212d6b63bbSAnton Blanchard rc = opal_dump_info(&id, &size); 2222d6b63bbSAnton Blanchard 2232d6b63bbSAnton Blanchard *dump_id = be32_to_cpu(id); 2242d6b63bbSAnton Blanchard *dump_size = be32_to_cpu(size); 2252d6b63bbSAnton Blanchard *dump_type = be32_to_cpu(type); 226c7e64b9cSStewart Smith 227c7e64b9cSStewart Smith if (rc) 228c7e64b9cSStewart Smith pr_warn("%s: Failed to get dump info (%d)\n", 229c7e64b9cSStewart Smith __func__, rc); 230c7e64b9cSStewart Smith return rc; 231c7e64b9cSStewart Smith } 232c7e64b9cSStewart Smith 233c7e64b9cSStewart Smith static int64_t dump_read_data(struct dump_obj *dump) 234c7e64b9cSStewart Smith { 235c7e64b9cSStewart Smith struct opal_sg_list *list; 236c7e64b9cSStewart Smith uint64_t addr; 237c7e64b9cSStewart Smith int64_t rc; 238c7e64b9cSStewart Smith 239c7e64b9cSStewart Smith /* Allocate memory */ 240c7e64b9cSStewart Smith dump->buffer = vzalloc(PAGE_ALIGN(dump->size)); 241c7e64b9cSStewart Smith if (!dump->buffer) { 242c7e64b9cSStewart Smith pr_err("%s : Failed to allocate memory\n", __func__); 243c7e64b9cSStewart Smith rc = -ENOMEM; 244c7e64b9cSStewart Smith goto out; 245c7e64b9cSStewart Smith } 246c7e64b9cSStewart Smith 247c7e64b9cSStewart Smith /* Generate SG list */ 2483441f04bSAnton Blanchard list = opal_vmalloc_to_sg_list(dump->buffer, dump->size); 249c7e64b9cSStewart Smith if (!list) { 250c7e64b9cSStewart Smith rc = -ENOMEM; 251c7e64b9cSStewart Smith goto out; 252c7e64b9cSStewart Smith } 253c7e64b9cSStewart Smith 254c7e64b9cSStewart Smith /* First entry address */ 255c7e64b9cSStewart Smith addr = __pa(list); 256c7e64b9cSStewart Smith 257c7e64b9cSStewart Smith /* Fetch data */ 258c7e64b9cSStewart Smith rc = OPAL_BUSY_EVENT; 259c7e64b9cSStewart Smith while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 260c7e64b9cSStewart Smith rc = opal_dump_read(dump->id, addr); 261c7e64b9cSStewart Smith if (rc == OPAL_BUSY_EVENT) { 262c7e64b9cSStewart Smith opal_poll_events(NULL); 263c7e64b9cSStewart Smith msleep(20); 264c7e64b9cSStewart Smith } 265c7e64b9cSStewart Smith } 266c7e64b9cSStewart Smith 267c7e64b9cSStewart Smith if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) 268c7e64b9cSStewart Smith pr_warn("%s: Extract dump failed for ID 0x%x\n", 269c7e64b9cSStewart Smith __func__, dump->id); 270c7e64b9cSStewart Smith 271c7e64b9cSStewart Smith /* Free SG list */ 2723441f04bSAnton Blanchard opal_free_sg_list(list); 273c7e64b9cSStewart Smith 274c7e64b9cSStewart Smith out: 275c7e64b9cSStewart Smith return rc; 276c7e64b9cSStewart Smith } 277c7e64b9cSStewart Smith 278c7e64b9cSStewart Smith static ssize_t dump_attr_read(struct file *filep, struct kobject *kobj, 279c7e64b9cSStewart Smith struct bin_attribute *bin_attr, 280c7e64b9cSStewart Smith char *buffer, loff_t pos, size_t count) 281c7e64b9cSStewart Smith { 282c7e64b9cSStewart Smith ssize_t rc; 283c7e64b9cSStewart Smith 284c7e64b9cSStewart Smith struct dump_obj *dump = to_dump_obj(kobj); 285c7e64b9cSStewart Smith 286c7e64b9cSStewart Smith if (!dump->buffer) { 287c7e64b9cSStewart Smith rc = dump_read_data(dump); 288c7e64b9cSStewart Smith 289c7e64b9cSStewart Smith if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) { 290c7e64b9cSStewart Smith vfree(dump->buffer); 291c7e64b9cSStewart Smith dump->buffer = NULL; 292c7e64b9cSStewart Smith 293c7e64b9cSStewart Smith return -EIO; 294c7e64b9cSStewart Smith } 295c7e64b9cSStewart Smith if (rc == OPAL_PARTIAL) { 296c7e64b9cSStewart Smith /* On a partial read, we just return EIO 297c7e64b9cSStewart Smith * and rely on userspace to ask us to try 298c7e64b9cSStewart Smith * again. 299c7e64b9cSStewart Smith */ 300c7e64b9cSStewart Smith pr_info("%s: Platform dump partially read.ID = 0x%x\n", 301c7e64b9cSStewart Smith __func__, dump->id); 302c7e64b9cSStewart Smith return -EIO; 303c7e64b9cSStewart Smith } 304c7e64b9cSStewart Smith } 305c7e64b9cSStewart Smith 306c7e64b9cSStewart Smith memcpy(buffer, dump->buffer + pos, count); 307c7e64b9cSStewart Smith 308c7e64b9cSStewart Smith /* You may think we could free the dump buffer now and retrieve 309c7e64b9cSStewart Smith * it again later if needed, but due to current firmware limitation, 310c7e64b9cSStewart Smith * that's not the case. So, once read into userspace once, 311c7e64b9cSStewart Smith * we keep the dump around until it's acknowledged by userspace. 312c7e64b9cSStewart Smith */ 313c7e64b9cSStewart Smith 314c7e64b9cSStewart Smith return count; 315c7e64b9cSStewart Smith } 316c7e64b9cSStewart Smith 317c7e64b9cSStewart Smith static struct dump_obj *create_dump_obj(uint32_t id, size_t size, 318c7e64b9cSStewart Smith uint32_t type) 319c7e64b9cSStewart Smith { 320c7e64b9cSStewart Smith struct dump_obj *dump; 321c7e64b9cSStewart Smith int rc; 322c7e64b9cSStewart Smith 323c7e64b9cSStewart Smith dump = kzalloc(sizeof(*dump), GFP_KERNEL); 324c7e64b9cSStewart Smith if (!dump) 325c7e64b9cSStewart Smith return NULL; 326c7e64b9cSStewart Smith 327c7e64b9cSStewart Smith dump->kobj.kset = dump_kset; 328c7e64b9cSStewart Smith 329c7e64b9cSStewart Smith kobject_init(&dump->kobj, &dump_ktype); 330c7e64b9cSStewart Smith 331c7e64b9cSStewart Smith sysfs_bin_attr_init(&dump->dump_attr); 332c7e64b9cSStewart Smith 333c7e64b9cSStewart Smith dump->dump_attr.attr.name = "dump"; 334c7e64b9cSStewart Smith dump->dump_attr.attr.mode = 0400; 335c7e64b9cSStewart Smith dump->dump_attr.size = size; 336c7e64b9cSStewart Smith dump->dump_attr.read = dump_attr_read; 337c7e64b9cSStewart Smith 338c7e64b9cSStewart Smith dump->id = id; 339c7e64b9cSStewart Smith dump->size = size; 340c7e64b9cSStewart Smith dump->type = type; 341c7e64b9cSStewart Smith 342c7e64b9cSStewart Smith rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id); 343c7e64b9cSStewart Smith if (rc) { 344c7e64b9cSStewart Smith kobject_put(&dump->kobj); 345c7e64b9cSStewart Smith return NULL; 346c7e64b9cSStewart Smith } 347c7e64b9cSStewart Smith 348c7e64b9cSStewart Smith rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr); 349c7e64b9cSStewart Smith if (rc) { 350c7e64b9cSStewart Smith kobject_put(&dump->kobj); 351c7e64b9cSStewart Smith return NULL; 352c7e64b9cSStewart Smith } 353c7e64b9cSStewart Smith 354c7e64b9cSStewart Smith pr_info("%s: New platform dump. ID = 0x%x Size %u\n", 355c7e64b9cSStewart Smith __func__, dump->id, dump->size); 356c7e64b9cSStewart Smith 357c7e64b9cSStewart Smith kobject_uevent(&dump->kobj, KOBJ_ADD); 358c7e64b9cSStewart Smith 359c7e64b9cSStewart Smith return dump; 360c7e64b9cSStewart Smith } 361c7e64b9cSStewart Smith 362c7e64b9cSStewart Smith static int process_dump(void) 363c7e64b9cSStewart Smith { 364c7e64b9cSStewart Smith int rc; 365c7e64b9cSStewart Smith uint32_t dump_id, dump_size, dump_type; 366c7e64b9cSStewart Smith struct dump_obj *dump; 367c7e64b9cSStewart Smith char name[22]; 368c7e64b9cSStewart Smith 369c7e64b9cSStewart Smith rc = dump_read_info(&dump_id, &dump_size, &dump_type); 370c7e64b9cSStewart Smith if (rc != OPAL_SUCCESS) 371c7e64b9cSStewart Smith return rc; 372c7e64b9cSStewart Smith 373c7e64b9cSStewart Smith sprintf(name, "0x%x-0x%x", dump_type, dump_id); 374c7e64b9cSStewart Smith 375c7e64b9cSStewart Smith /* we may get notified twice, let's handle 376c7e64b9cSStewart Smith * that gracefully and not create two conflicting 377c7e64b9cSStewart Smith * entries. 378c7e64b9cSStewart Smith */ 379c7e64b9cSStewart Smith if (kset_find_obj(dump_kset, name)) 380c7e64b9cSStewart Smith return 0; 381c7e64b9cSStewart Smith 382c7e64b9cSStewart Smith dump = create_dump_obj(dump_id, dump_size, dump_type); 383c7e64b9cSStewart Smith if (!dump) 384c7e64b9cSStewart Smith return -1; 385c7e64b9cSStewart Smith 386c7e64b9cSStewart Smith return 0; 387c7e64b9cSStewart Smith } 388c7e64b9cSStewart Smith 389c7e64b9cSStewart Smith static void dump_work_fn(struct work_struct *work) 390c7e64b9cSStewart Smith { 391c7e64b9cSStewart Smith process_dump(); 392c7e64b9cSStewart Smith } 393c7e64b9cSStewart Smith 394c7e64b9cSStewart Smith static DECLARE_WORK(dump_work, dump_work_fn); 395c7e64b9cSStewart Smith 396c7e64b9cSStewart Smith static void schedule_process_dump(void) 397c7e64b9cSStewart Smith { 398c7e64b9cSStewart Smith schedule_work(&dump_work); 399c7e64b9cSStewart Smith } 400c7e64b9cSStewart Smith 401c7e64b9cSStewart Smith /* 402c7e64b9cSStewart Smith * New dump available notification 403c7e64b9cSStewart Smith * 404c7e64b9cSStewart Smith * Once we get notification, we add sysfs entries for it. 405c7e64b9cSStewart Smith * We only fetch the dump on demand, and create sysfs asynchronously. 406c7e64b9cSStewart Smith */ 407c7e64b9cSStewart Smith static int dump_event(struct notifier_block *nb, 408c7e64b9cSStewart Smith unsigned long events, void *change) 409c7e64b9cSStewart Smith { 410c7e64b9cSStewart Smith if (events & OPAL_EVENT_DUMP_AVAIL) 411c7e64b9cSStewart Smith schedule_process_dump(); 412c7e64b9cSStewart Smith 413c7e64b9cSStewart Smith return 0; 414c7e64b9cSStewart Smith } 415c7e64b9cSStewart Smith 416c7e64b9cSStewart Smith static struct notifier_block dump_nb = { 417c7e64b9cSStewart Smith .notifier_call = dump_event, 418c7e64b9cSStewart Smith .next = NULL, 419c7e64b9cSStewart Smith .priority = 0 420c7e64b9cSStewart Smith }; 421c7e64b9cSStewart Smith 422c7e64b9cSStewart Smith void __init opal_platform_dump_init(void) 423c7e64b9cSStewart Smith { 424c7e64b9cSStewart Smith int rc; 425c7e64b9cSStewart Smith 426c7e64b9cSStewart Smith dump_kset = kset_create_and_add("dump", NULL, opal_kobj); 427c7e64b9cSStewart Smith if (!dump_kset) { 428c7e64b9cSStewart Smith pr_warn("%s: Failed to create dump kset\n", __func__); 429c7e64b9cSStewart Smith return; 430c7e64b9cSStewart Smith } 431c7e64b9cSStewart Smith 432c7e64b9cSStewart Smith rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group); 433c7e64b9cSStewart Smith if (rc) { 434c7e64b9cSStewart Smith pr_warn("%s: Failed to create initiate dump attr group\n", 435c7e64b9cSStewart Smith __func__); 436c7e64b9cSStewart Smith kobject_put(&dump_kset->kobj); 437c7e64b9cSStewart Smith return; 438c7e64b9cSStewart Smith } 439c7e64b9cSStewart Smith 440c7e64b9cSStewart Smith rc = opal_notifier_register(&dump_nb); 441c7e64b9cSStewart Smith if (rc) { 442c7e64b9cSStewart Smith pr_warn("%s: Can't register OPAL event notifier (%d)\n", 443c7e64b9cSStewart Smith __func__, rc); 444c7e64b9cSStewart Smith return; 445c7e64b9cSStewart Smith } 446c7e64b9cSStewart Smith 447c7e64b9cSStewart Smith opal_dump_resend_notification(); 448c7e64b9cSStewart Smith } 449