316 lines
6.9 KiB
C
316 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Error log support on PowerNV.
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*
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* Copyright 2013,2014 IBM Corp.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/fs.h>
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#include <linux/vmalloc.h>
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#include <linux/fcntl.h>
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#include <linux/kobject.h>
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#include <linux/uaccess.h>
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#include <asm/opal.h>
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struct elog_obj {
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struct kobject kobj;
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struct bin_attribute raw_attr;
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uint64_t id;
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uint64_t type;
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size_t size;
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char *buffer;
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};
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#define to_elog_obj(x) container_of(x, struct elog_obj, kobj)
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struct elog_attribute {
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struct attribute attr;
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ssize_t (*show)(struct elog_obj *elog, struct elog_attribute *attr,
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char *buf);
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ssize_t (*store)(struct elog_obj *elog, struct elog_attribute *attr,
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const char *buf, size_t count);
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};
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#define to_elog_attr(x) container_of(x, struct elog_attribute, attr)
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static ssize_t elog_id_show(struct elog_obj *elog_obj,
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struct elog_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "0x%llx\n", elog_obj->id);
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}
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static const char *elog_type_to_string(uint64_t type)
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{
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switch (type) {
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case 0: return "PEL";
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default: return "unknown";
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}
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}
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static ssize_t elog_type_show(struct elog_obj *elog_obj,
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struct elog_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "0x%llx %s\n",
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elog_obj->type,
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elog_type_to_string(elog_obj->type));
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}
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static ssize_t elog_ack_show(struct elog_obj *elog_obj,
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struct elog_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "ack - acknowledge log message\n");
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}
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static ssize_t elog_ack_store(struct elog_obj *elog_obj,
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struct elog_attribute *attr,
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const char *buf,
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size_t count)
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{
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opal_send_ack_elog(elog_obj->id);
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sysfs_remove_file_self(&elog_obj->kobj, &attr->attr);
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kobject_put(&elog_obj->kobj);
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return count;
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}
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static struct elog_attribute id_attribute =
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__ATTR(id, 0444, elog_id_show, NULL);
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static struct elog_attribute type_attribute =
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__ATTR(type, 0444, elog_type_show, NULL);
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static struct elog_attribute ack_attribute =
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__ATTR(acknowledge, 0660, elog_ack_show, elog_ack_store);
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static struct kset *elog_kset;
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static ssize_t elog_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 elog_attribute *attribute;
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struct elog_obj *elog;
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attribute = to_elog_attr(attr);
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elog = to_elog_obj(kobj);
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if (!attribute->show)
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return -EIO;
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return attribute->show(elog, attribute, buf);
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}
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static ssize_t elog_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 elog_attribute *attribute;
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struct elog_obj *elog;
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attribute = to_elog_attr(attr);
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elog = to_elog_obj(kobj);
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if (!attribute->store)
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return -EIO;
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return attribute->store(elog, attribute, buf, len);
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}
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static const struct sysfs_ops elog_sysfs_ops = {
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.show = elog_attr_show,
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.store = elog_attr_store,
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};
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static void elog_release(struct kobject *kobj)
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{
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struct elog_obj *elog;
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elog = to_elog_obj(kobj);
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kfree(elog->buffer);
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kfree(elog);
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}
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static struct attribute *elog_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 elog_ktype = {
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.sysfs_ops = &elog_sysfs_ops,
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.release = &elog_release,
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.default_attrs = elog_default_attrs,
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};
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/* Maximum size of a single log on FSP is 16KB */
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#define OPAL_MAX_ERRLOG_SIZE 16384
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static ssize_t raw_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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int opal_rc;
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struct elog_obj *elog = to_elog_obj(kobj);
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/* We may have had an error reading before, so let's retry */
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if (!elog->buffer) {
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elog->buffer = kzalloc(elog->size, GFP_KERNEL);
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if (!elog->buffer)
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return -EIO;
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opal_rc = opal_read_elog(__pa(elog->buffer),
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elog->size, elog->id);
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if (opal_rc != OPAL_SUCCESS) {
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pr_err("ELOG: log read failed for log-id=%llx\n",
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elog->id);
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kfree(elog->buffer);
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elog->buffer = NULL;
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return -EIO;
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}
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}
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memcpy(buffer, elog->buffer + pos, count);
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return count;
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}
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static struct elog_obj *create_elog_obj(uint64_t id, size_t size, uint64_t type)
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{
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struct elog_obj *elog;
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int rc;
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elog = kzalloc(sizeof(*elog), GFP_KERNEL);
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if (!elog)
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return NULL;
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elog->kobj.kset = elog_kset;
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kobject_init(&elog->kobj, &elog_ktype);
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sysfs_bin_attr_init(&elog->raw_attr);
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elog->raw_attr.attr.name = "raw";
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elog->raw_attr.attr.mode = 0400;
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elog->raw_attr.size = size;
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elog->raw_attr.read = raw_attr_read;
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elog->id = id;
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elog->size = size;
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elog->type = type;
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elog->buffer = kzalloc(elog->size, GFP_KERNEL);
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if (elog->buffer) {
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rc = opal_read_elog(__pa(elog->buffer),
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elog->size, elog->id);
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if (rc != OPAL_SUCCESS) {
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pr_err("ELOG: log read failed for log-id=%llx\n",
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elog->id);
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kfree(elog->buffer);
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elog->buffer = NULL;
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}
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}
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rc = kobject_add(&elog->kobj, NULL, "0x%llx", id);
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if (rc) {
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kobject_put(&elog->kobj);
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return NULL;
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}
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rc = sysfs_create_bin_file(&elog->kobj, &elog->raw_attr);
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if (rc) {
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kobject_put(&elog->kobj);
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return NULL;
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}
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kobject_uevent(&elog->kobj, KOBJ_ADD);
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return elog;
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}
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static irqreturn_t elog_event(int irq, void *data)
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{
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__be64 size;
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__be64 id;
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__be64 type;
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uint64_t elog_size;
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uint64_t log_id;
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uint64_t elog_type;
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int rc;
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char name[2+16+1];
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struct kobject *kobj;
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rc = opal_get_elog_size(&id, &size, &type);
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if (rc != OPAL_SUCCESS) {
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pr_err("ELOG: OPAL log info read failed\n");
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return IRQ_HANDLED;
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}
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elog_size = be64_to_cpu(size);
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log_id = be64_to_cpu(id);
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elog_type = be64_to_cpu(type);
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WARN_ON(elog_size > OPAL_MAX_ERRLOG_SIZE);
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if (elog_size >= OPAL_MAX_ERRLOG_SIZE)
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elog_size = OPAL_MAX_ERRLOG_SIZE;
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sprintf(name, "0x%llx", log_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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kobj = kset_find_obj(elog_kset, name);
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if (kobj) {
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/* Drop reference added by kset_find_obj() */
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kobject_put(kobj);
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return IRQ_HANDLED;
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}
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create_elog_obj(log_id, elog_size, elog_type);
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return IRQ_HANDLED;
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}
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int __init opal_elog_init(void)
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{
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int rc = 0, irq;
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/* ELOG not supported by firmware */
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if (!opal_check_token(OPAL_ELOG_READ))
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return -1;
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elog_kset = kset_create_and_add("elog", NULL, opal_kobj);
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if (!elog_kset) {
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pr_warn("%s: failed to create elog kset\n", __func__);
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return -1;
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}
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irq = opal_event_request(ilog2(OPAL_EVENT_ERROR_LOG_AVAIL));
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if (!irq) {
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pr_err("%s: Can't register OPAL event irq (%d)\n",
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__func__, irq);
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return irq;
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}
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rc = request_threaded_irq(irq, NULL, elog_event,
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IRQF_TRIGGER_HIGH | IRQF_ONESHOT, "opal-elog", NULL);
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if (rc) {
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pr_err("%s: Can't request OPAL event irq (%d)\n",
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__func__, rc);
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return rc;
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}
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/* We are now ready to pull error logs from opal. */
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if (opal_check_token(OPAL_ELOG_RESEND))
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opal_resend_pending_logs();
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return 0;
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}
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