mirror of https://gitee.com/openkylin/linux.git
457 lines
9.7 KiB
C
457 lines
9.7 KiB
C
/*
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* PowerNV OPAL Dump Interface
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*
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* Copyright 2013,2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kobject.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/pagemap.h>
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#include <linux/delay.h>
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#include <asm/opal.h>
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#define DUMP_TYPE_FSP 0x01
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struct dump_obj {
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struct kobject kobj;
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struct bin_attribute dump_attr;
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uint32_t id; /* becomes object name */
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uint32_t type;
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uint32_t size;
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char *buffer;
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};
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#define to_dump_obj(x) container_of(x, struct dump_obj, kobj)
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struct dump_attribute {
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struct attribute attr;
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ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr,
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char *buf);
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ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr,
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const char *buf, size_t count);
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};
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#define to_dump_attr(x) container_of(x, struct dump_attribute, attr)
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static ssize_t dump_id_show(struct dump_obj *dump_obj,
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struct dump_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "0x%x\n", dump_obj->id);
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}
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static const char* dump_type_to_string(uint32_t type)
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{
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switch (type) {
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case 0x01: return "SP Dump";
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case 0x02: return "System/Platform Dump";
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case 0x03: return "SMA Dump";
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default: return "unknown";
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}
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}
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static ssize_t dump_type_show(struct dump_obj *dump_obj,
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struct dump_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "0x%x %s\n", dump_obj->type,
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dump_type_to_string(dump_obj->type));
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}
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static ssize_t dump_ack_show(struct dump_obj *dump_obj,
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struct dump_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "ack - acknowledge dump\n");
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}
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/*
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* Send acknowledgement to OPAL
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*/
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static int64_t dump_send_ack(uint32_t dump_id)
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{
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int rc;
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rc = opal_dump_ack(dump_id);
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if (rc)
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pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n",
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__func__, dump_id, rc);
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return rc;
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}
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static ssize_t dump_ack_store(struct dump_obj *dump_obj,
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struct dump_attribute *attr,
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const char *buf,
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size_t count)
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{
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dump_send_ack(dump_obj->id);
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sysfs_remove_file_self(&dump_obj->kobj, &attr->attr);
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kobject_put(&dump_obj->kobj);
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return count;
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}
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/* Attributes of a dump
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* The binary attribute of the dump itself is dynamic
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* due to the dynamic size of the dump
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*/
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static struct dump_attribute id_attribute =
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__ATTR(id, S_IRUGO, dump_id_show, NULL);
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static struct dump_attribute type_attribute =
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__ATTR(type, S_IRUGO, dump_type_show, NULL);
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static struct dump_attribute ack_attribute =
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__ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store);
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static ssize_t init_dump_show(struct dump_obj *dump_obj,
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struct dump_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n");
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}
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static int64_t dump_fips_init(uint8_t type)
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{
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int rc;
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rc = opal_dump_init(type);
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if (rc)
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pr_warn("%s: Failed to initiate FSP dump (%d)\n",
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__func__, rc);
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return rc;
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}
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static ssize_t init_dump_store(struct dump_obj *dump_obj,
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struct dump_attribute *attr,
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const char *buf,
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size_t count)
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{
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int rc;
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rc = dump_fips_init(DUMP_TYPE_FSP);
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if (rc == OPAL_SUCCESS)
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pr_info("%s: Initiated FSP dump\n", __func__);
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return count;
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}
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static struct dump_attribute initiate_attribute =
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__ATTR(initiate_dump, 0600, init_dump_show, init_dump_store);
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static struct attribute *initiate_attrs[] = {
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&initiate_attribute.attr,
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NULL,
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};
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static struct attribute_group initiate_attr_group = {
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.attrs = initiate_attrs,
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};
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static struct kset *dump_kset;
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static ssize_t dump_attr_show(struct kobject *kobj,
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struct attribute *attr,
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char *buf)
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{
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struct dump_attribute *attribute;
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struct dump_obj *dump;
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attribute = to_dump_attr(attr);
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dump = to_dump_obj(kobj);
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if (!attribute->show)
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return -EIO;
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return attribute->show(dump, attribute, buf);
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}
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static ssize_t dump_attr_store(struct kobject *kobj,
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struct attribute *attr,
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const char *buf, size_t len)
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{
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struct dump_attribute *attribute;
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struct dump_obj *dump;
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attribute = to_dump_attr(attr);
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dump = to_dump_obj(kobj);
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if (!attribute->store)
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return -EIO;
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return attribute->store(dump, attribute, buf, len);
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}
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static const struct sysfs_ops dump_sysfs_ops = {
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.show = dump_attr_show,
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.store = dump_attr_store,
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};
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static void dump_release(struct kobject *kobj)
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{
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struct dump_obj *dump;
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dump = to_dump_obj(kobj);
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vfree(dump->buffer);
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kfree(dump);
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}
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static struct attribute *dump_default_attrs[] = {
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&id_attribute.attr,
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&type_attribute.attr,
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&ack_attribute.attr,
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NULL,
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};
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static struct kobj_type dump_ktype = {
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.sysfs_ops = &dump_sysfs_ops,
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.release = &dump_release,
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.default_attrs = dump_default_attrs,
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};
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static int64_t dump_read_info(uint32_t *dump_id, uint32_t *dump_size, uint32_t *dump_type)
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{
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__be32 id, size, type;
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int rc;
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type = cpu_to_be32(0xffffffff);
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rc = opal_dump_info2(&id, &size, &type);
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if (rc == OPAL_PARAMETER)
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rc = opal_dump_info(&id, &size);
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*dump_id = be32_to_cpu(id);
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*dump_size = be32_to_cpu(size);
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*dump_type = be32_to_cpu(type);
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if (rc)
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pr_warn("%s: Failed to get dump info (%d)\n",
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__func__, rc);
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return rc;
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}
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static int64_t dump_read_data(struct dump_obj *dump)
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{
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struct opal_sg_list *list;
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uint64_t addr;
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int64_t rc;
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/* Allocate memory */
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dump->buffer = vzalloc(PAGE_ALIGN(dump->size));
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if (!dump->buffer) {
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pr_err("%s : Failed to allocate memory\n", __func__);
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rc = -ENOMEM;
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goto out;
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}
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/* Generate SG list */
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list = opal_vmalloc_to_sg_list(dump->buffer, dump->size);
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if (!list) {
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rc = -ENOMEM;
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goto out;
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}
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/* First entry address */
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addr = __pa(list);
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/* Fetch data */
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rc = OPAL_BUSY_EVENT;
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while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
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rc = opal_dump_read(dump->id, addr);
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if (rc == OPAL_BUSY_EVENT) {
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opal_poll_events(NULL);
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msleep(20);
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}
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}
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if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL)
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pr_warn("%s: Extract dump failed for ID 0x%x\n",
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__func__, dump->id);
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/* Free SG list */
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opal_free_sg_list(list);
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out:
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return rc;
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}
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static ssize_t dump_attr_read(struct file *filep, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buffer, loff_t pos, size_t count)
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{
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ssize_t rc;
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struct dump_obj *dump = to_dump_obj(kobj);
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if (!dump->buffer) {
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rc = dump_read_data(dump);
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if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) {
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vfree(dump->buffer);
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dump->buffer = NULL;
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return -EIO;
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}
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if (rc == OPAL_PARTIAL) {
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/* On a partial read, we just return EIO
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* and rely on userspace to ask us to try
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* again.
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*/
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pr_info("%s: Platform dump partially read. ID = 0x%x\n",
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__func__, dump->id);
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return -EIO;
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}
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}
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memcpy(buffer, dump->buffer + pos, count);
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/* You may think we could free the dump buffer now and retrieve
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* it again later if needed, but due to current firmware limitation,
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* that's not the case. So, once read into userspace once,
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* we keep the dump around until it's acknowledged by userspace.
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*/
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return count;
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}
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static struct dump_obj *create_dump_obj(uint32_t id, size_t size,
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uint32_t type)
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{
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struct dump_obj *dump;
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int rc;
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dump = kzalloc(sizeof(*dump), GFP_KERNEL);
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if (!dump)
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return NULL;
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dump->kobj.kset = dump_kset;
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kobject_init(&dump->kobj, &dump_ktype);
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sysfs_bin_attr_init(&dump->dump_attr);
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dump->dump_attr.attr.name = "dump";
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dump->dump_attr.attr.mode = 0400;
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dump->dump_attr.size = size;
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dump->dump_attr.read = dump_attr_read;
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dump->id = id;
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dump->size = size;
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dump->type = type;
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rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id);
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if (rc) {
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kobject_put(&dump->kobj);
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return NULL;
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}
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rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr);
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if (rc) {
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kobject_put(&dump->kobj);
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return NULL;
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}
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pr_info("%s: New platform dump. ID = 0x%x Size %u\n",
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__func__, dump->id, dump->size);
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kobject_uevent(&dump->kobj, KOBJ_ADD);
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return dump;
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}
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static int process_dump(void)
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{
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int rc;
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uint32_t dump_id, dump_size, dump_type;
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struct dump_obj *dump;
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char name[22];
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rc = dump_read_info(&dump_id, &dump_size, &dump_type);
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if (rc != OPAL_SUCCESS)
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return rc;
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sprintf(name, "0x%x-0x%x", dump_type, dump_id);
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/* we may get notified twice, let's handle
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* that gracefully and not create two conflicting
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* entries.
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*/
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if (kset_find_obj(dump_kset, name))
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return 0;
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dump = create_dump_obj(dump_id, dump_size, dump_type);
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if (!dump)
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return -1;
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return 0;
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}
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static void dump_work_fn(struct work_struct *work)
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{
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process_dump();
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}
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static DECLARE_WORK(dump_work, dump_work_fn);
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static void schedule_process_dump(void)
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{
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schedule_work(&dump_work);
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}
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/*
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* New dump available notification
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*
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* Once we get notification, we add sysfs entries for it.
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* We only fetch the dump on demand, and create sysfs asynchronously.
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*/
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static int dump_event(struct notifier_block *nb,
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unsigned long events, void *change)
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{
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if (events & OPAL_EVENT_DUMP_AVAIL)
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schedule_process_dump();
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return 0;
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}
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static struct notifier_block dump_nb = {
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.notifier_call = dump_event,
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.next = NULL,
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.priority = 0
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};
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void __init opal_platform_dump_init(void)
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{
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int rc;
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/* ELOG not supported by firmware */
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if (!opal_check_token(OPAL_DUMP_READ))
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return;
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dump_kset = kset_create_and_add("dump", NULL, opal_kobj);
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if (!dump_kset) {
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pr_warn("%s: Failed to create dump kset\n", __func__);
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return;
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}
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rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group);
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if (rc) {
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pr_warn("%s: Failed to create initiate dump attr group\n",
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__func__);
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kobject_put(&dump_kset->kobj);
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return;
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}
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rc = opal_notifier_register(&dump_nb);
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if (rc) {
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pr_warn("%s: Can't register OPAL event notifier (%d)\n",
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__func__, rc);
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return;
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}
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opal_dump_resend_notification();
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}
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