blob: e23399c7f7735ad8677d7f011821cc5d3fa56717 [file] [log] [blame]
Bernhard Walle69ac9cd2008-06-27 13:12:54 +02001/*
2 * linux/drivers/firmware/memmap.c
3 * Copyright (C) 2008 SUSE LINUX Products GmbH
4 * by Bernhard Walle <bwalle@suse.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License v2.0 as published by
8 * the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17#include <linux/string.h>
18#include <linux/firmware-map.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/types.h>
22#include <linux/bootmem.h>
23
24/*
25 * Data types ------------------------------------------------------------------
26 */
27
28/*
29 * Firmware map entry. Because firmware memory maps are flat and not
30 * hierarchical, it's ok to organise them in a linked list. No parent
31 * information is necessary as for the resource tree.
32 */
33struct firmware_map_entry {
34 resource_size_t start; /* start of the memory range */
35 resource_size_t end; /* end of the memory range (incl.) */
36 const char *type; /* type of the memory range */
37 struct list_head list; /* entry for the linked list */
38 struct kobject kobj; /* kobject for each entry */
39};
40
41/*
42 * Forward declarations --------------------------------------------------------
43 */
44static ssize_t memmap_attr_show(struct kobject *kobj,
45 struct attribute *attr, char *buf);
46static ssize_t start_show(struct firmware_map_entry *entry, char *buf);
47static ssize_t end_show(struct firmware_map_entry *entry, char *buf);
48static ssize_t type_show(struct firmware_map_entry *entry, char *buf);
49
50/*
51 * Static data -----------------------------------------------------------------
52 */
53
54struct memmap_attribute {
55 struct attribute attr;
56 ssize_t (*show)(struct firmware_map_entry *entry, char *buf);
57};
58
59struct memmap_attribute memmap_start_attr = __ATTR_RO(start);
60struct memmap_attribute memmap_end_attr = __ATTR_RO(end);
61struct memmap_attribute memmap_type_attr = __ATTR_RO(type);
62
63/*
64 * These are default attributes that are added for every memmap entry.
65 */
66static struct attribute *def_attrs[] = {
67 &memmap_start_attr.attr,
68 &memmap_end_attr.attr,
69 &memmap_type_attr.attr,
70 NULL
71};
72
73static struct sysfs_ops memmap_attr_ops = {
74 .show = memmap_attr_show,
75};
76
77static struct kobj_type memmap_ktype = {
78 .sysfs_ops = &memmap_attr_ops,
79 .default_attrs = def_attrs,
80};
81
82/*
83 * Registration functions ------------------------------------------------------
84 */
85
86/*
87 * Firmware memory map entries
88 */
89static LIST_HEAD(map_entries);
90
91/**
92 * Common implementation of firmware_map_add() and firmware_map_add_early()
93 * which expects a pre-allocated struct firmware_map_entry.
94 *
95 * @start: Start of the memory range.
96 * @end: End of the memory range (inclusive).
97 * @type: Type of the memory range.
98 * @entry: Pre-allocated (either kmalloc() or bootmem allocator), uninitialised
99 * entry.
100 */
101static int firmware_map_add_entry(resource_size_t start, resource_size_t end,
102 const char *type,
103 struct firmware_map_entry *entry)
104{
105 BUG_ON(start > end);
106
107 entry->start = start;
108 entry->end = end;
109 entry->type = type;
110 INIT_LIST_HEAD(&entry->list);
111 kobject_init(&entry->kobj, &memmap_ktype);
112
113 list_add_tail(&entry->list, &map_entries);
114
115 return 0;
116}
117
118/*
119 * See <linux/firmware-map.h> for documentation.
120 */
121int firmware_map_add(resource_size_t start, resource_size_t end,
122 const char *type)
123{
124 struct firmware_map_entry *entry;
125
126 entry = kmalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC);
127 WARN_ON(!entry);
128 if (!entry)
129 return -ENOMEM;
130
131 return firmware_map_add_entry(start, end, type, entry);
132}
133
134/*
135 * See <linux/firmware-map.h> for documentation.
136 */
137int __init firmware_map_add_early(resource_size_t start, resource_size_t end,
138 const char *type)
139{
140 struct firmware_map_entry *entry;
141
142 entry = alloc_bootmem_low(sizeof(struct firmware_map_entry));
143 WARN_ON(!entry);
144 if (!entry)
145 return -ENOMEM;
146
147 return firmware_map_add_entry(start, end, type, entry);
148}
149
150/*
151 * Sysfs functions -------------------------------------------------------------
152 */
153
154static ssize_t start_show(struct firmware_map_entry *entry, char *buf)
155{
156 return snprintf(buf, PAGE_SIZE, "0x%llx\n", entry->start);
157}
158
159static ssize_t end_show(struct firmware_map_entry *entry, char *buf)
160{
161 return snprintf(buf, PAGE_SIZE, "0x%llx\n", entry->end);
162}
163
164static ssize_t type_show(struct firmware_map_entry *entry, char *buf)
165{
166 return snprintf(buf, PAGE_SIZE, "%s\n", entry->type);
167}
168
169#define to_memmap_attr(_attr) container_of(_attr, struct memmap_attribute, attr)
170#define to_memmap_entry(obj) container_of(obj, struct firmware_map_entry, kobj)
171
172static ssize_t memmap_attr_show(struct kobject *kobj,
173 struct attribute *attr, char *buf)
174{
175 struct firmware_map_entry *entry = to_memmap_entry(kobj);
176 struct memmap_attribute *memmap_attr = to_memmap_attr(attr);
177
178 return memmap_attr->show(entry, buf);
179}
180
181/*
182 * Initialises stuff and adds the entries in the map_entries list to
183 * sysfs. Important is that firmware_map_add() and firmware_map_add_early()
184 * must be called before late_initcall.
185 */
186static int __init memmap_init(void)
187{
188 int i = 0;
189 struct firmware_map_entry *entry;
190 struct kset *memmap_kset;
191
192 memmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj);
193 WARN_ON(!memmap_kset);
194 if (!memmap_kset)
195 return -ENOMEM;
196
197 list_for_each_entry(entry, &map_entries, list) {
198 entry->kobj.kset = memmap_kset;
199 kobject_add(&entry->kobj, NULL, "%d", i++);
200 }
201
202 return 0;
203}
204late_initcall(memmap_init);
205