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1 | /* |
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 | */ | |
33 | struct 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 | */ | |
44 | static ssize_t memmap_attr_show(struct kobject *kobj, | |
45 | struct attribute *attr, char *buf); | |
46 | static ssize_t start_show(struct firmware_map_entry *entry, char *buf); | |
47 | static ssize_t end_show(struct firmware_map_entry *entry, char *buf); | |
48 | static ssize_t type_show(struct firmware_map_entry *entry, char *buf); | |
49 | ||
50 | /* | |
51 | * Static data ----------------------------------------------------------------- | |
52 | */ | |
53 | ||
54 | struct memmap_attribute { | |
55 | struct attribute attr; | |
56 | ssize_t (*show)(struct firmware_map_entry *entry, char *buf); | |
57 | }; | |
58 | ||
59 | struct memmap_attribute memmap_start_attr = __ATTR_RO(start); | |
60 | struct memmap_attribute memmap_end_attr = __ATTR_RO(end); | |
61 | struct memmap_attribute memmap_type_attr = __ATTR_RO(type); | |
62 | ||
63 | /* | |
64 | * These are default attributes that are added for every memmap entry. | |
65 | */ | |
66 | static struct attribute *def_attrs[] = { | |
67 | &memmap_start_attr.attr, | |
68 | &memmap_end_attr.attr, | |
69 | &memmap_type_attr.attr, | |
70 | NULL | |
71 | }; | |
72 | ||
73 | static struct sysfs_ops memmap_attr_ops = { | |
74 | .show = memmap_attr_show, | |
75 | }; | |
76 | ||
77 | static 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 | */ | |
89 | static 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 | */ | |
101 | static 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 | */ | |
121 | int 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 | */ | |
137 | int __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 | ||
154 | static 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 | ||
159 | static 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 | ||
164 | static 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 | ||
172 | static 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 | */ | |
186 | static 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 | } | |
204 | late_initcall(memmap_init); | |
205 |