2 * Error log support on PowerNV.
4 * Copyright 2013,2014 IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/sysfs.h>
17 #include <linux/vmalloc.h>
18 #include <linux/fcntl.h>
19 #include <linux/kobject.h>
20 #include <asm/uaccess.h>
25 struct bin_attribute raw_attr;
31 #define to_elog_obj(x) container_of(x, struct elog_obj, kobj)
33 struct elog_attribute {
34 struct attribute attr;
35 ssize_t (*show)(struct elog_obj *elog, struct elog_attribute *attr,
37 ssize_t (*store)(struct elog_obj *elog, struct elog_attribute *attr,
38 const char *buf, size_t count);
40 #define to_elog_attr(x) container_of(x, struct elog_attribute, attr)
42 static ssize_t elog_id_show(struct elog_obj *elog_obj,
43 struct elog_attribute *attr,
46 return sprintf(buf, "0x%llx\n", elog_obj->id);
49 static const char *elog_type_to_string(uint64_t type)
53 default: return "unknown";
57 static ssize_t elog_type_show(struct elog_obj *elog_obj,
58 struct elog_attribute *attr,
61 return sprintf(buf, "0x%llx %s\n",
63 elog_type_to_string(elog_obj->type));
66 static ssize_t elog_ack_show(struct elog_obj *elog_obj,
67 struct elog_attribute *attr,
70 return sprintf(buf, "ack - acknowledge log message\n");
73 static void delay_release_kobj(void *kobj)
75 kobject_put((struct kobject *)kobj);
78 static ssize_t elog_ack_store(struct elog_obj *elog_obj,
79 struct elog_attribute *attr,
83 opal_send_ack_elog(elog_obj->id);
84 sysfs_schedule_callback(&elog_obj->kobj, delay_release_kobj,
85 &elog_obj->kobj, THIS_MODULE);
89 static struct elog_attribute id_attribute =
90 __ATTR(id, 0666, elog_id_show, NULL);
91 static struct elog_attribute type_attribute =
92 __ATTR(type, 0666, elog_type_show, NULL);
93 static struct elog_attribute ack_attribute =
94 __ATTR(acknowledge, 0660, elog_ack_show, elog_ack_store);
96 static struct kset *elog_kset;
98 static ssize_t elog_attr_show(struct kobject *kobj,
99 struct attribute *attr,
102 struct elog_attribute *attribute;
103 struct elog_obj *elog;
105 attribute = to_elog_attr(attr);
106 elog = to_elog_obj(kobj);
108 if (!attribute->show)
111 return attribute->show(elog, attribute, buf);
114 static ssize_t elog_attr_store(struct kobject *kobj,
115 struct attribute *attr,
116 const char *buf, size_t len)
118 struct elog_attribute *attribute;
119 struct elog_obj *elog;
121 attribute = to_elog_attr(attr);
122 elog = to_elog_obj(kobj);
124 if (!attribute->store)
127 return attribute->store(elog, attribute, buf, len);
130 static const struct sysfs_ops elog_sysfs_ops = {
131 .show = elog_attr_show,
132 .store = elog_attr_store,
135 static void elog_release(struct kobject *kobj)
137 struct elog_obj *elog;
139 elog = to_elog_obj(kobj);
144 static struct attribute *elog_default_attrs[] = {
146 &type_attribute.attr,
151 static struct kobj_type elog_ktype = {
152 .sysfs_ops = &elog_sysfs_ops,
153 .release = &elog_release,
154 .default_attrs = elog_default_attrs,
157 /* Maximum size of a single log on FSP is 16KB */
158 #define OPAL_MAX_ERRLOG_SIZE 16384
160 static ssize_t raw_attr_read(struct file *filep, struct kobject *kobj,
161 struct bin_attribute *bin_attr,
162 char *buffer, loff_t pos, size_t count)
166 struct elog_obj *elog = to_elog_obj(kobj);
168 /* We may have had an error reading before, so let's retry */
170 elog->buffer = kzalloc(elog->size, GFP_KERNEL);
174 opal_rc = opal_read_elog(__pa(elog->buffer),
175 elog->size, elog->id);
176 if (opal_rc != OPAL_SUCCESS) {
177 pr_err("ELOG: log read failed for log-id=%llx\n",
185 memcpy(buffer, elog->buffer + pos, count);
190 static struct elog_obj *create_elog_obj(uint64_t id, size_t size, uint64_t type)
192 struct elog_obj *elog;
195 elog = kzalloc(sizeof(*elog), GFP_KERNEL);
199 elog->kobj.kset = elog_kset;
201 kobject_init(&elog->kobj, &elog_ktype);
203 sysfs_bin_attr_init(&elog->raw_attr);
205 elog->raw_attr.attr.name = "raw";
206 elog->raw_attr.attr.mode = 0400;
207 elog->raw_attr.size = size;
208 elog->raw_attr.read = raw_attr_read;
214 elog->buffer = kzalloc(elog->size, GFP_KERNEL);
217 rc = opal_read_elog(__pa(elog->buffer),
218 elog->size, elog->id);
219 if (rc != OPAL_SUCCESS) {
220 pr_err("ELOG: log read failed for log-id=%llx\n",
227 rc = kobject_add(&elog->kobj, NULL, "0x%llx", id);
229 kobject_put(&elog->kobj);
233 rc = sysfs_create_bin_file(&elog->kobj, &elog->raw_attr);
235 kobject_put(&elog->kobj);
239 kobject_uevent(&elog->kobj, KOBJ_ADD);
244 static void elog_work_fn(struct work_struct *work)
252 rc = opal_get_elog_size(&log_id, &elog_size, &elog_type);
253 if (rc != OPAL_SUCCESS) {
254 pr_err("ELOG: Opal log read failed\n");
258 BUG_ON(elog_size > OPAL_MAX_ERRLOG_SIZE);
260 if (elog_size >= OPAL_MAX_ERRLOG_SIZE)
261 elog_size = OPAL_MAX_ERRLOG_SIZE;
263 sprintf(name, "0x%llx", log_id);
265 /* we may get notified twice, let's handle
266 * that gracefully and not create two conflicting
269 if (kset_find_obj(elog_kset, name))
272 create_elog_obj(log_id, elog_size, elog_type);
275 static DECLARE_WORK(elog_work, elog_work_fn);
277 static int elog_event(struct notifier_block *nb,
278 unsigned long events, void *change)
280 /* check for error log event */
281 if (events & OPAL_EVENT_ERROR_LOG_AVAIL)
282 schedule_work(&elog_work);
286 static struct notifier_block elog_nb = {
287 .notifier_call = elog_event,
292 int __init opal_elog_init(void)
296 elog_kset = kset_create_and_add("elog", NULL, opal_kobj);
298 pr_warn("%s: failed to create elog kset\n", __func__);
302 rc = opal_notifier_register(&elog_nb);
304 pr_err("%s: Can't register OPAL event notifier (%d)\n",
309 /* We are now ready to pull error logs from opal. */
310 opal_resend_pending_logs();