12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2c7e64b9cSStewart Smith /* 3c7e64b9cSStewart Smith * PowerNV OPAL Dump Interface 4c7e64b9cSStewart Smith * 5c7e64b9cSStewart Smith * Copyright 2013,2014 IBM Corp. 6c7e64b9cSStewart Smith */ 7c7e64b9cSStewart Smith 8c7e64b9cSStewart Smith #include <linux/kobject.h> 9c7e64b9cSStewart Smith #include <linux/mm.h> 10c7e64b9cSStewart Smith #include <linux/slab.h> 11c7e64b9cSStewart Smith #include <linux/vmalloc.h> 12c7e64b9cSStewart Smith #include <linux/pagemap.h> 13c7e64b9cSStewart Smith #include <linux/delay.h> 148034f715SAlistair Popple #include <linux/interrupt.h> 15c7e64b9cSStewart Smith 16c7e64b9cSStewart Smith #include <asm/opal.h> 17c7e64b9cSStewart Smith 18c7e64b9cSStewart Smith #define DUMP_TYPE_FSP 0x01 19c7e64b9cSStewart Smith 20c7e64b9cSStewart Smith struct dump_obj { 21c7e64b9cSStewart Smith struct kobject kobj; 22c7e64b9cSStewart Smith struct bin_attribute dump_attr; 23c7e64b9cSStewart Smith uint32_t id; /* becomes object name */ 24c7e64b9cSStewart Smith uint32_t type; 25c7e64b9cSStewart Smith uint32_t size; 26c7e64b9cSStewart Smith char *buffer; 27c7e64b9cSStewart Smith }; 28c7e64b9cSStewart Smith #define to_dump_obj(x) container_of(x, struct dump_obj, kobj) 29c7e64b9cSStewart Smith 30c7e64b9cSStewart Smith struct dump_attribute { 31c7e64b9cSStewart Smith struct attribute attr; 32c7e64b9cSStewart Smith ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr, 33c7e64b9cSStewart Smith char *buf); 34c7e64b9cSStewart Smith ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr, 35c7e64b9cSStewart Smith const char *buf, size_t count); 36c7e64b9cSStewart Smith }; 37c7e64b9cSStewart Smith #define to_dump_attr(x) container_of(x, struct dump_attribute, attr) 38c7e64b9cSStewart Smith 39c7e64b9cSStewart Smith static ssize_t dump_id_show(struct dump_obj *dump_obj, 40c7e64b9cSStewart Smith struct dump_attribute *attr, 41c7e64b9cSStewart Smith char *buf) 42c7e64b9cSStewart Smith { 43c7e64b9cSStewart Smith return sprintf(buf, "0x%x\n", dump_obj->id); 44c7e64b9cSStewart Smith } 45c7e64b9cSStewart Smith 46c7e64b9cSStewart Smith static const char* dump_type_to_string(uint32_t type) 47c7e64b9cSStewart Smith { 48c7e64b9cSStewart Smith switch (type) { 49c7e64b9cSStewart Smith case 0x01: return "SP Dump"; 50c7e64b9cSStewart Smith case 0x02: return "System/Platform Dump"; 51c7e64b9cSStewart Smith case 0x03: return "SMA Dump"; 52c7e64b9cSStewart Smith default: return "unknown"; 53c7e64b9cSStewart Smith } 54c7e64b9cSStewart Smith } 55c7e64b9cSStewart Smith 56c7e64b9cSStewart Smith static ssize_t dump_type_show(struct dump_obj *dump_obj, 57c7e64b9cSStewart Smith struct dump_attribute *attr, 58c7e64b9cSStewart Smith char *buf) 59c7e64b9cSStewart Smith { 60c7e64b9cSStewart Smith 61c7e64b9cSStewart Smith return sprintf(buf, "0x%x %s\n", dump_obj->type, 62c7e64b9cSStewart Smith dump_type_to_string(dump_obj->type)); 63c7e64b9cSStewart Smith } 64c7e64b9cSStewart Smith 65c7e64b9cSStewart Smith static ssize_t dump_ack_show(struct dump_obj *dump_obj, 66c7e64b9cSStewart Smith struct dump_attribute *attr, 67c7e64b9cSStewart Smith char *buf) 68c7e64b9cSStewart Smith { 69c7e64b9cSStewart Smith return sprintf(buf, "ack - acknowledge dump\n"); 70c7e64b9cSStewart Smith } 71c7e64b9cSStewart Smith 72c7e64b9cSStewart Smith /* 73c7e64b9cSStewart Smith * Send acknowledgement to OPAL 74c7e64b9cSStewart Smith */ 75c7e64b9cSStewart Smith static int64_t dump_send_ack(uint32_t dump_id) 76c7e64b9cSStewart Smith { 77c7e64b9cSStewart Smith int rc; 78c7e64b9cSStewart Smith 79c7e64b9cSStewart Smith rc = opal_dump_ack(dump_id); 80c7e64b9cSStewart Smith if (rc) 81c7e64b9cSStewart Smith pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n", 82c7e64b9cSStewart Smith __func__, dump_id, rc); 83c7e64b9cSStewart Smith return rc; 84c7e64b9cSStewart Smith } 85c7e64b9cSStewart Smith 86c7e64b9cSStewart Smith static ssize_t dump_ack_store(struct dump_obj *dump_obj, 87c7e64b9cSStewart Smith struct dump_attribute *attr, 88c7e64b9cSStewart Smith const char *buf, 89c7e64b9cSStewart Smith size_t count) 90c7e64b9cSStewart Smith { 91c7e64b9cSStewart Smith dump_send_ack(dump_obj->id); 92cc4f265aSStewart Smith sysfs_remove_file_self(&dump_obj->kobj, &attr->attr); 93cc4f265aSStewart Smith kobject_put(&dump_obj->kobj); 94c7e64b9cSStewart Smith return count; 95c7e64b9cSStewart Smith } 96c7e64b9cSStewart Smith 97c7e64b9cSStewart Smith /* Attributes of a dump 98c7e64b9cSStewart Smith * The binary attribute of the dump itself is dynamic 99c7e64b9cSStewart Smith * due to the dynamic size of the dump 100c7e64b9cSStewart Smith */ 101c7e64b9cSStewart Smith static struct dump_attribute id_attribute = 10257ad583fSRussell Currey __ATTR(id, 0444, dump_id_show, NULL); 103c7e64b9cSStewart Smith static struct dump_attribute type_attribute = 10457ad583fSRussell Currey __ATTR(type, 0444, dump_type_show, NULL); 105c7e64b9cSStewart Smith static struct dump_attribute ack_attribute = 106c7e64b9cSStewart Smith __ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store); 107c7e64b9cSStewart Smith 108c7e64b9cSStewart Smith static ssize_t init_dump_show(struct dump_obj *dump_obj, 109c7e64b9cSStewart Smith struct dump_attribute *attr, 110c7e64b9cSStewart Smith char *buf) 111c7e64b9cSStewart Smith { 112cdd91b89SVasant Hegde return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n"); 113c7e64b9cSStewart Smith } 114c7e64b9cSStewart Smith 115c7e64b9cSStewart Smith static int64_t dump_fips_init(uint8_t type) 116c7e64b9cSStewart Smith { 117c7e64b9cSStewart Smith int rc; 118c7e64b9cSStewart Smith 119c7e64b9cSStewart Smith rc = opal_dump_init(type); 120c7e64b9cSStewart Smith if (rc) 121cdd91b89SVasant Hegde pr_warn("%s: Failed to initiate FSP dump (%d)\n", 122c7e64b9cSStewart Smith __func__, rc); 123c7e64b9cSStewart Smith return rc; 124c7e64b9cSStewart Smith } 125c7e64b9cSStewart Smith 126c7e64b9cSStewart Smith static ssize_t init_dump_store(struct dump_obj *dump_obj, 127c7e64b9cSStewart Smith struct dump_attribute *attr, 128c7e64b9cSStewart Smith const char *buf, 129c7e64b9cSStewart Smith size_t count) 130c7e64b9cSStewart Smith { 131cdd91b89SVasant Hegde int rc; 132cdd91b89SVasant Hegde 133cdd91b89SVasant Hegde rc = dump_fips_init(DUMP_TYPE_FSP); 134cdd91b89SVasant Hegde if (rc == OPAL_SUCCESS) 135c7e64b9cSStewart Smith pr_info("%s: Initiated FSP dump\n", __func__); 136cdd91b89SVasant Hegde 137c7e64b9cSStewart Smith return count; 138c7e64b9cSStewart Smith } 139c7e64b9cSStewart Smith 140c7e64b9cSStewart Smith static struct dump_attribute initiate_attribute = 141c7e64b9cSStewart Smith __ATTR(initiate_dump, 0600, init_dump_show, init_dump_store); 142c7e64b9cSStewart Smith 143c7e64b9cSStewart Smith static struct attribute *initiate_attrs[] = { 144c7e64b9cSStewart Smith &initiate_attribute.attr, 145c7e64b9cSStewart Smith NULL, 146c7e64b9cSStewart Smith }; 147c7e64b9cSStewart Smith 148c7e64b9cSStewart Smith static struct attribute_group initiate_attr_group = { 149c7e64b9cSStewart Smith .attrs = initiate_attrs, 150c7e64b9cSStewart Smith }; 151c7e64b9cSStewart Smith 152c7e64b9cSStewart Smith static struct kset *dump_kset; 153c7e64b9cSStewart Smith 154c7e64b9cSStewart Smith static ssize_t dump_attr_show(struct kobject *kobj, 155c7e64b9cSStewart Smith struct attribute *attr, 156c7e64b9cSStewart Smith char *buf) 157c7e64b9cSStewart Smith { 158c7e64b9cSStewart Smith struct dump_attribute *attribute; 159c7e64b9cSStewart Smith struct dump_obj *dump; 160c7e64b9cSStewart Smith 161c7e64b9cSStewart Smith attribute = to_dump_attr(attr); 162c7e64b9cSStewart Smith dump = to_dump_obj(kobj); 163c7e64b9cSStewart Smith 164c7e64b9cSStewart Smith if (!attribute->show) 165c7e64b9cSStewart Smith return -EIO; 166c7e64b9cSStewart Smith 167c7e64b9cSStewart Smith return attribute->show(dump, attribute, buf); 168c7e64b9cSStewart Smith } 169c7e64b9cSStewart Smith 170c7e64b9cSStewart Smith static ssize_t dump_attr_store(struct kobject *kobj, 171c7e64b9cSStewart Smith struct attribute *attr, 172c7e64b9cSStewart Smith const char *buf, size_t len) 173c7e64b9cSStewart Smith { 174c7e64b9cSStewart Smith struct dump_attribute *attribute; 175c7e64b9cSStewart Smith struct dump_obj *dump; 176c7e64b9cSStewart Smith 177c7e64b9cSStewart Smith attribute = to_dump_attr(attr); 178c7e64b9cSStewart Smith dump = to_dump_obj(kobj); 179c7e64b9cSStewart Smith 180c7e64b9cSStewart Smith if (!attribute->store) 181c7e64b9cSStewart Smith return -EIO; 182c7e64b9cSStewart Smith 183c7e64b9cSStewart Smith return attribute->store(dump, attribute, buf, len); 184c7e64b9cSStewart Smith } 185c7e64b9cSStewart Smith 186c7e64b9cSStewart Smith static const struct sysfs_ops dump_sysfs_ops = { 187c7e64b9cSStewart Smith .show = dump_attr_show, 188c7e64b9cSStewart Smith .store = dump_attr_store, 189c7e64b9cSStewart Smith }; 190c7e64b9cSStewart Smith 191c7e64b9cSStewart Smith static void dump_release(struct kobject *kobj) 192c7e64b9cSStewart Smith { 193c7e64b9cSStewart Smith struct dump_obj *dump; 194c7e64b9cSStewart Smith 195c7e64b9cSStewart Smith dump = to_dump_obj(kobj); 196c7e64b9cSStewart Smith vfree(dump->buffer); 197c7e64b9cSStewart Smith kfree(dump); 198c7e64b9cSStewart Smith } 199c7e64b9cSStewart Smith 200c7e64b9cSStewart Smith static struct attribute *dump_default_attrs[] = { 201c7e64b9cSStewart Smith &id_attribute.attr, 202c7e64b9cSStewart Smith &type_attribute.attr, 203c7e64b9cSStewart Smith &ack_attribute.attr, 204c7e64b9cSStewart Smith NULL, 205c7e64b9cSStewart Smith }; 206c7e64b9cSStewart Smith 207c7e64b9cSStewart Smith static struct kobj_type dump_ktype = { 208c7e64b9cSStewart Smith .sysfs_ops = &dump_sysfs_ops, 209c7e64b9cSStewart Smith .release = &dump_release, 210c7e64b9cSStewart Smith .default_attrs = dump_default_attrs, 211c7e64b9cSStewart Smith }; 212c7e64b9cSStewart Smith 2132d6b63bbSAnton Blanchard static int64_t dump_read_info(uint32_t *dump_id, uint32_t *dump_size, uint32_t *dump_type) 214c7e64b9cSStewart Smith { 2152d6b63bbSAnton Blanchard __be32 id, size, type; 216c7e64b9cSStewart Smith int rc; 217c7e64b9cSStewart Smith 2182d6b63bbSAnton Blanchard type = cpu_to_be32(0xffffffff); 219c7e64b9cSStewart Smith 2202d6b63bbSAnton Blanchard rc = opal_dump_info2(&id, &size, &type); 221c7e64b9cSStewart Smith if (rc == OPAL_PARAMETER) 2222d6b63bbSAnton Blanchard rc = opal_dump_info(&id, &size); 2232d6b63bbSAnton Blanchard 224a5bbe8fdSMukesh Ojha if (rc) { 225a5bbe8fdSMukesh Ojha pr_warn("%s: Failed to get dump info (%d)\n", 226a5bbe8fdSMukesh Ojha __func__, rc); 227a5bbe8fdSMukesh Ojha return rc; 228a5bbe8fdSMukesh Ojha } 229a5bbe8fdSMukesh Ojha 2302d6b63bbSAnton Blanchard *dump_id = be32_to_cpu(id); 2312d6b63bbSAnton Blanchard *dump_size = be32_to_cpu(size); 2322d6b63bbSAnton Blanchard *dump_type = be32_to_cpu(type); 233c7e64b9cSStewart Smith 234c7e64b9cSStewart Smith return rc; 235c7e64b9cSStewart Smith } 236c7e64b9cSStewart Smith 237c7e64b9cSStewart Smith static int64_t dump_read_data(struct dump_obj *dump) 238c7e64b9cSStewart Smith { 239c7e64b9cSStewart Smith struct opal_sg_list *list; 240c7e64b9cSStewart Smith uint64_t addr; 241c7e64b9cSStewart Smith int64_t rc; 242c7e64b9cSStewart Smith 243c7e64b9cSStewart Smith /* Allocate memory */ 244c7e64b9cSStewart Smith dump->buffer = vzalloc(PAGE_ALIGN(dump->size)); 245c7e64b9cSStewart Smith if (!dump->buffer) { 246c7e64b9cSStewart Smith pr_err("%s : Failed to allocate memory\n", __func__); 247c7e64b9cSStewart Smith rc = -ENOMEM; 248c7e64b9cSStewart Smith goto out; 249c7e64b9cSStewart Smith } 250c7e64b9cSStewart Smith 251c7e64b9cSStewart Smith /* Generate SG list */ 2523441f04bSAnton Blanchard list = opal_vmalloc_to_sg_list(dump->buffer, dump->size); 253c7e64b9cSStewart Smith if (!list) { 254c7e64b9cSStewart Smith rc = -ENOMEM; 255c7e64b9cSStewart Smith goto out; 256c7e64b9cSStewart Smith } 257c7e64b9cSStewart Smith 258c7e64b9cSStewart Smith /* First entry address */ 259c7e64b9cSStewart Smith addr = __pa(list); 260c7e64b9cSStewart Smith 261c7e64b9cSStewart Smith /* Fetch data */ 262c7e64b9cSStewart Smith rc = OPAL_BUSY_EVENT; 263c7e64b9cSStewart Smith while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { 264c7e64b9cSStewart Smith rc = opal_dump_read(dump->id, addr); 265c7e64b9cSStewart Smith if (rc == OPAL_BUSY_EVENT) { 266c7e64b9cSStewart Smith opal_poll_events(NULL); 267c7e64b9cSStewart Smith msleep(20); 268c7e64b9cSStewart Smith } 269c7e64b9cSStewart Smith } 270c7e64b9cSStewart Smith 271c7e64b9cSStewart Smith if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) 272c7e64b9cSStewart Smith pr_warn("%s: Extract dump failed for ID 0x%x\n", 273c7e64b9cSStewart Smith __func__, dump->id); 274c7e64b9cSStewart Smith 275c7e64b9cSStewart Smith /* Free SG list */ 2763441f04bSAnton Blanchard opal_free_sg_list(list); 277c7e64b9cSStewart Smith 278c7e64b9cSStewart Smith out: 279c7e64b9cSStewart Smith return rc; 280c7e64b9cSStewart Smith } 281c7e64b9cSStewart Smith 282c7e64b9cSStewart Smith static ssize_t dump_attr_read(struct file *filep, struct kobject *kobj, 283c7e64b9cSStewart Smith struct bin_attribute *bin_attr, 284c7e64b9cSStewart Smith char *buffer, loff_t pos, size_t count) 285c7e64b9cSStewart Smith { 286c7e64b9cSStewart Smith ssize_t rc; 287c7e64b9cSStewart Smith 288c7e64b9cSStewart Smith struct dump_obj *dump = to_dump_obj(kobj); 289c7e64b9cSStewart Smith 290c7e64b9cSStewart Smith if (!dump->buffer) { 291c7e64b9cSStewart Smith rc = dump_read_data(dump); 292c7e64b9cSStewart Smith 293c7e64b9cSStewart Smith if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) { 294c7e64b9cSStewart Smith vfree(dump->buffer); 295c7e64b9cSStewart Smith dump->buffer = NULL; 296c7e64b9cSStewart Smith 297c7e64b9cSStewart Smith return -EIO; 298c7e64b9cSStewart Smith } 299c7e64b9cSStewart Smith if (rc == OPAL_PARTIAL) { 300c7e64b9cSStewart Smith /* On a partial read, we just return EIO 301c7e64b9cSStewart Smith * and rely on userspace to ask us to try 302c7e64b9cSStewart Smith * again. 303c7e64b9cSStewart Smith */ 304c7e64b9cSStewart Smith pr_info("%s: Platform dump partially read. ID = 0x%x\n", 305c7e64b9cSStewart Smith __func__, dump->id); 306c7e64b9cSStewart Smith return -EIO; 307c7e64b9cSStewart Smith } 308c7e64b9cSStewart Smith } 309c7e64b9cSStewart Smith 310c7e64b9cSStewart Smith memcpy(buffer, dump->buffer + pos, count); 311c7e64b9cSStewart Smith 312c7e64b9cSStewart Smith /* You may think we could free the dump buffer now and retrieve 313c7e64b9cSStewart Smith * it again later if needed, but due to current firmware limitation, 314c7e64b9cSStewart Smith * that's not the case. So, once read into userspace once, 315c7e64b9cSStewart Smith * we keep the dump around until it's acknowledged by userspace. 316c7e64b9cSStewart Smith */ 317c7e64b9cSStewart Smith 318c7e64b9cSStewart Smith return count; 319c7e64b9cSStewart Smith } 320c7e64b9cSStewart Smith 3210a43ae3eSVasant Hegde static void create_dump_obj(uint32_t id, size_t size, uint32_t type) 322c7e64b9cSStewart Smith { 323c7e64b9cSStewart Smith struct dump_obj *dump; 324c7e64b9cSStewart Smith int rc; 325c7e64b9cSStewart Smith 326c7e64b9cSStewart Smith dump = kzalloc(sizeof(*dump), GFP_KERNEL); 327c7e64b9cSStewart Smith if (!dump) 3280a43ae3eSVasant Hegde return; 329c7e64b9cSStewart Smith 330c7e64b9cSStewart Smith dump->kobj.kset = dump_kset; 331c7e64b9cSStewart Smith 332c7e64b9cSStewart Smith kobject_init(&dump->kobj, &dump_ktype); 333c7e64b9cSStewart Smith 334c7e64b9cSStewart Smith sysfs_bin_attr_init(&dump->dump_attr); 335c7e64b9cSStewart Smith 336c7e64b9cSStewart Smith dump->dump_attr.attr.name = "dump"; 337c7e64b9cSStewart Smith dump->dump_attr.attr.mode = 0400; 338c7e64b9cSStewart Smith dump->dump_attr.size = size; 339c7e64b9cSStewart Smith dump->dump_attr.read = dump_attr_read; 340c7e64b9cSStewart Smith 341c7e64b9cSStewart Smith dump->id = id; 342c7e64b9cSStewart Smith dump->size = size; 343c7e64b9cSStewart Smith dump->type = type; 344c7e64b9cSStewart Smith 345c7e64b9cSStewart Smith rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id); 346c7e64b9cSStewart Smith if (rc) { 347c7e64b9cSStewart Smith kobject_put(&dump->kobj); 3480a43ae3eSVasant Hegde return; 349c7e64b9cSStewart Smith } 350c7e64b9cSStewart Smith 3510a43ae3eSVasant Hegde /* 3520a43ae3eSVasant Hegde * As soon as the sysfs file for this dump is created/activated there is 3530a43ae3eSVasant Hegde * a chance the opal_errd daemon (or any userspace) might read and 3540a43ae3eSVasant Hegde * acknowledge the dump before kobject_uevent() is called. If that 3550a43ae3eSVasant Hegde * happens then there is a potential race between 3560a43ae3eSVasant Hegde * dump_ack_store->kobject_put() and kobject_uevent() which leads to a 3570a43ae3eSVasant Hegde * use-after-free of a kernfs object resulting in a kernel crash. 3580a43ae3eSVasant Hegde * 3590a43ae3eSVasant Hegde * To avoid that, we need to take a reference on behalf of the bin file, 3600a43ae3eSVasant Hegde * so that our reference remains valid while we call kobject_uevent(). 3610a43ae3eSVasant Hegde * We then drop our reference before exiting the function, leaving the 3620a43ae3eSVasant Hegde * bin file to drop the last reference (if it hasn't already). 3630a43ae3eSVasant Hegde */ 3640a43ae3eSVasant Hegde 3650a43ae3eSVasant Hegde /* Take a reference for the bin file */ 3660a43ae3eSVasant Hegde kobject_get(&dump->kobj); 367c7e64b9cSStewart Smith rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr); 3680a43ae3eSVasant Hegde if (rc == 0) { 3690a43ae3eSVasant Hegde kobject_uevent(&dump->kobj, KOBJ_ADD); 370c7e64b9cSStewart Smith 371c7e64b9cSStewart Smith pr_info("%s: New platform dump. ID = 0x%x Size %u\n", 372c7e64b9cSStewart Smith __func__, dump->id, dump->size); 3730a43ae3eSVasant Hegde } else { 3740a43ae3eSVasant Hegde /* Drop reference count taken for bin file */ 3750a43ae3eSVasant Hegde kobject_put(&dump->kobj); 3760a43ae3eSVasant Hegde } 377c7e64b9cSStewart Smith 3780a43ae3eSVasant Hegde /* Drop our reference */ 3790a43ae3eSVasant Hegde kobject_put(&dump->kobj); 3800a43ae3eSVasant Hegde return; 381c7e64b9cSStewart Smith } 382c7e64b9cSStewart Smith 3838034f715SAlistair Popple static irqreturn_t process_dump(int irq, void *data) 384c7e64b9cSStewart Smith { 385c7e64b9cSStewart Smith int rc; 386c7e64b9cSStewart Smith uint32_t dump_id, dump_size, dump_type; 387c7e64b9cSStewart Smith char name[22]; 388a9cbf0b2SMukesh Ojha struct kobject *kobj; 389c7e64b9cSStewart Smith 390c7e64b9cSStewart Smith rc = dump_read_info(&dump_id, &dump_size, &dump_type); 391c7e64b9cSStewart Smith if (rc != OPAL_SUCCESS) 392b29336c0SMukesh Ojha return IRQ_HANDLED; 393c7e64b9cSStewart Smith 394c7e64b9cSStewart Smith sprintf(name, "0x%x-0x%x", dump_type, dump_id); 395c7e64b9cSStewart Smith 396c7e64b9cSStewart Smith /* we may get notified twice, let's handle 397c7e64b9cSStewart Smith * that gracefully and not create two conflicting 398c7e64b9cSStewart Smith * entries. 399c7e64b9cSStewart Smith */ 400a9cbf0b2SMukesh Ojha kobj = kset_find_obj(dump_kset, name); 401a9cbf0b2SMukesh Ojha if (kobj) { 402a9cbf0b2SMukesh Ojha /* Drop reference added by kset_find_obj() */ 403a9cbf0b2SMukesh Ojha kobject_put(kobj); 404b29336c0SMukesh Ojha return IRQ_HANDLED; 405a9cbf0b2SMukesh Ojha } 406c7e64b9cSStewart Smith 407b29336c0SMukesh Ojha create_dump_obj(dump_id, dump_size, dump_type); 408c7e64b9cSStewart Smith 4098034f715SAlistair Popple return IRQ_HANDLED; 410c7e64b9cSStewart Smith } 411c7e64b9cSStewart Smith 412c7e64b9cSStewart Smith void __init opal_platform_dump_init(void) 413c7e64b9cSStewart Smith { 414c7e64b9cSStewart Smith int rc; 4158034f715SAlistair Popple int dump_irq; 416c7e64b9cSStewart Smith 417831cf65bSMichael Neuling /* ELOG not supported by firmware */ 418831cf65bSMichael Neuling if (!opal_check_token(OPAL_DUMP_READ)) 419831cf65bSMichael Neuling return; 420831cf65bSMichael Neuling 421c7e64b9cSStewart Smith dump_kset = kset_create_and_add("dump", NULL, opal_kobj); 422c7e64b9cSStewart Smith if (!dump_kset) { 423c7e64b9cSStewart Smith pr_warn("%s: Failed to create dump kset\n", __func__); 424c7e64b9cSStewart Smith return; 425c7e64b9cSStewart Smith } 426c7e64b9cSStewart Smith 427c7e64b9cSStewart Smith rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group); 428c7e64b9cSStewart Smith if (rc) { 429c7e64b9cSStewart Smith pr_warn("%s: Failed to create initiate dump attr group\n", 430c7e64b9cSStewart Smith __func__); 431c7e64b9cSStewart Smith kobject_put(&dump_kset->kobj); 432c7e64b9cSStewart Smith return; 433c7e64b9cSStewart Smith } 434c7e64b9cSStewart Smith 4358034f715SAlistair Popple dump_irq = opal_event_request(ilog2(OPAL_EVENT_DUMP_AVAIL)); 4368034f715SAlistair Popple if (!dump_irq) { 4378034f715SAlistair Popple pr_err("%s: Can't register OPAL event irq (%d)\n", 4388034f715SAlistair Popple __func__, dump_irq); 4398034f715SAlistair Popple return; 4408034f715SAlistair Popple } 4418034f715SAlistair Popple 4428034f715SAlistair Popple rc = request_threaded_irq(dump_irq, NULL, process_dump, 4438034f715SAlistair Popple IRQF_TRIGGER_HIGH | IRQF_ONESHOT, 4448034f715SAlistair Popple "opal-dump", NULL); 445c7e64b9cSStewart Smith if (rc) { 4468034f715SAlistair Popple pr_err("%s: Can't request OPAL event irq (%d)\n", 447c7e64b9cSStewart Smith __func__, rc); 448c7e64b9cSStewart Smith return; 449c7e64b9cSStewart Smith } 450c7e64b9cSStewart Smith 4517e73a3b7SStewart Smith if (opal_check_token(OPAL_DUMP_RESEND)) 452c7e64b9cSStewart Smith opal_dump_resend_notification(); 453c7e64b9cSStewart Smith } 454