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69ac9cd6 BW |
1 | /* |
2 | * linux/drivers/firmware/memmap.c | |
3 | * Copyright (C) 2008 SUSE LINUX Products GmbH | |
97bef7dd | 4 | * by Bernhard Walle <bernhard.walle@gmx.de> |
69ac9cd6 BW |
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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
69ac9cd6 BW |
24 | |
25 | /* | |
26 | * Data types ------------------------------------------------------------------ | |
27 | */ | |
28 | ||
29 | /* | |
30 | * Firmware map entry. Because firmware memory maps are flat and not | |
31 | * hierarchical, it's ok to organise them in a linked list. No parent | |
32 | * information is necessary as for the resource tree. | |
33 | */ | |
34 | struct firmware_map_entry { | |
3b0fde0f YL |
35 | /* |
36 | * start and end must be u64 rather than resource_size_t, because e820 | |
37 | * resources can lie at addresses above 4G. | |
38 | */ | |
39 | u64 start; /* start of the memory range */ | |
40 | u64 end; /* end of the memory range (incl.) */ | |
69ac9cd6 BW |
41 | const char *type; /* type of the memory range */ |
42 | struct list_head list; /* entry for the linked list */ | |
43 | struct kobject kobj; /* kobject for each entry */ | |
44 | }; | |
45 | ||
46 | /* | |
47 | * Forward declarations -------------------------------------------------------- | |
48 | */ | |
49 | static ssize_t memmap_attr_show(struct kobject *kobj, | |
50 | struct attribute *attr, char *buf); | |
51 | static ssize_t start_show(struct firmware_map_entry *entry, char *buf); | |
52 | static ssize_t end_show(struct firmware_map_entry *entry, char *buf); | |
53 | static ssize_t type_show(struct firmware_map_entry *entry, char *buf); | |
54 | ||
55 | /* | |
56 | * Static data ----------------------------------------------------------------- | |
57 | */ | |
58 | ||
59 | struct memmap_attribute { | |
60 | struct attribute attr; | |
61 | ssize_t (*show)(struct firmware_map_entry *entry, char *buf); | |
62 | }; | |
63 | ||
da2bdf9a RK |
64 | static struct memmap_attribute memmap_start_attr = __ATTR_RO(start); |
65 | static struct memmap_attribute memmap_end_attr = __ATTR_RO(end); | |
66 | static struct memmap_attribute memmap_type_attr = __ATTR_RO(type); | |
69ac9cd6 BW |
67 | |
68 | /* | |
69 | * These are default attributes that are added for every memmap entry. | |
70 | */ | |
71 | static struct attribute *def_attrs[] = { | |
72 | &memmap_start_attr.attr, | |
73 | &memmap_end_attr.attr, | |
74 | &memmap_type_attr.attr, | |
75 | NULL | |
76 | }; | |
77 | ||
52cf25d0 | 78 | static const struct sysfs_ops memmap_attr_ops = { |
69ac9cd6 BW |
79 | .show = memmap_attr_show, |
80 | }; | |
81 | ||
82 | static struct kobj_type memmap_ktype = { | |
83 | .sysfs_ops = &memmap_attr_ops, | |
84 | .default_attrs = def_attrs, | |
85 | }; | |
86 | ||
87 | /* | |
88 | * Registration functions ------------------------------------------------------ | |
89 | */ | |
90 | ||
91 | /* | |
31bad924 BW |
92 | * Firmware memory map entries. No locking is needed because the |
93 | * firmware_map_add() and firmware_map_add_early() functions are called | |
94 | * in firmware initialisation code in one single thread of execution. | |
69ac9cd6 BW |
95 | */ |
96 | static LIST_HEAD(map_entries); | |
97 | ||
98 | /** | |
31bad924 | 99 | * firmware_map_add_entry() - Does the real work to add a firmware memmap entry. |
69ac9cd6 | 100 | * @start: Start of the memory range. |
4ed940d4 | 101 | * @end: End of the memory range (exclusive). |
69ac9cd6 BW |
102 | * @type: Type of the memory range. |
103 | * @entry: Pre-allocated (either kmalloc() or bootmem allocator), uninitialised | |
104 | * entry. | |
31bad924 BW |
105 | * |
106 | * Common implementation of firmware_map_add() and firmware_map_add_early() | |
107 | * which expects a pre-allocated struct firmware_map_entry. | |
108 | **/ | |
3b0fde0f | 109 | static int firmware_map_add_entry(u64 start, u64 end, |
69ac9cd6 BW |
110 | const char *type, |
111 | struct firmware_map_entry *entry) | |
112 | { | |
113 | BUG_ON(start > end); | |
114 | ||
115 | entry->start = start; | |
4ed940d4 | 116 | entry->end = end - 1; |
69ac9cd6 BW |
117 | entry->type = type; |
118 | INIT_LIST_HEAD(&entry->list); | |
119 | kobject_init(&entry->kobj, &memmap_ktype); | |
120 | ||
121 | list_add_tail(&entry->list, &map_entries); | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
d96ae530 AM |
126 | /* |
127 | * Add memmap entry on sysfs | |
128 | */ | |
129 | static int add_sysfs_fw_map_entry(struct firmware_map_entry *entry) | |
130 | { | |
131 | static int map_entries_nr; | |
132 | static struct kset *mmap_kset; | |
133 | ||
134 | if (!mmap_kset) { | |
135 | mmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj); | |
136 | if (!mmap_kset) | |
137 | return -ENOMEM; | |
138 | } | |
139 | ||
140 | entry->kobj.kset = mmap_kset; | |
141 | if (kobject_add(&entry->kobj, NULL, "%d", map_entries_nr++)) | |
142 | kobject_put(&entry->kobj); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
31bad924 | 147 | /** |
d96ae530 AM |
148 | * firmware_map_add_hotplug() - Adds a firmware mapping entry when we do |
149 | * memory hotplug. | |
31bad924 | 150 | * @start: Start of the memory range. |
4ed940d4 | 151 | * @end: End of the memory range (exclusive) |
31bad924 BW |
152 | * @type: Type of the memory range. |
153 | * | |
d96ae530 AM |
154 | * Adds a firmware mapping entry. This function is for memory hotplug, it is |
155 | * similar to function firmware_map_add_early(). The only difference is that | |
156 | * it will create the syfs entry dynamically. | |
31bad924 BW |
157 | * |
158 | * Returns 0 on success, or -ENOMEM if no memory could be allocated. | |
159 | **/ | |
d96ae530 | 160 | int __meminit firmware_map_add_hotplug(u64 start, u64 end, const char *type) |
69ac9cd6 BW |
161 | { |
162 | struct firmware_map_entry *entry; | |
163 | ||
d96ae530 | 164 | entry = kzalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC); |
69ac9cd6 BW |
165 | if (!entry) |
166 | return -ENOMEM; | |
167 | ||
d96ae530 AM |
168 | firmware_map_add_entry(start, end, type, entry); |
169 | /* create the memmap entry */ | |
170 | add_sysfs_fw_map_entry(entry); | |
171 | ||
172 | return 0; | |
69ac9cd6 BW |
173 | } |
174 | ||
31bad924 BW |
175 | /** |
176 | * firmware_map_add_early() - Adds a firmware mapping entry. | |
177 | * @start: Start of the memory range. | |
4ed940d4 | 178 | * @end: End of the memory range. |
31bad924 BW |
179 | * @type: Type of the memory range. |
180 | * | |
181 | * Adds a firmware mapping entry. This function uses the bootmem allocator | |
d96ae530 | 182 | * for memory allocation. |
31bad924 BW |
183 | * |
184 | * That function must be called before late_initcall. | |
185 | * | |
186 | * Returns 0 on success, or -ENOMEM if no memory could be allocated. | |
187 | **/ | |
3b0fde0f | 188 | int __init firmware_map_add_early(u64 start, u64 end, const char *type) |
69ac9cd6 BW |
189 | { |
190 | struct firmware_map_entry *entry; | |
191 | ||
3c1596ef | 192 | entry = alloc_bootmem(sizeof(struct firmware_map_entry)); |
31bad924 | 193 | if (WARN_ON(!entry)) |
69ac9cd6 BW |
194 | return -ENOMEM; |
195 | ||
196 | return firmware_map_add_entry(start, end, type, entry); | |
197 | } | |
198 | ||
199 | /* | |
200 | * Sysfs functions ------------------------------------------------------------- | |
201 | */ | |
202 | ||
203 | static ssize_t start_show(struct firmware_map_entry *entry, char *buf) | |
204 | { | |
78681ac0 RD |
205 | return snprintf(buf, PAGE_SIZE, "0x%llx\n", |
206 | (unsigned long long)entry->start); | |
69ac9cd6 BW |
207 | } |
208 | ||
209 | static ssize_t end_show(struct firmware_map_entry *entry, char *buf) | |
210 | { | |
78681ac0 RD |
211 | return snprintf(buf, PAGE_SIZE, "0x%llx\n", |
212 | (unsigned long long)entry->end); | |
69ac9cd6 BW |
213 | } |
214 | ||
215 | static ssize_t type_show(struct firmware_map_entry *entry, char *buf) | |
216 | { | |
217 | return snprintf(buf, PAGE_SIZE, "%s\n", entry->type); | |
218 | } | |
219 | ||
220 | #define to_memmap_attr(_attr) container_of(_attr, struct memmap_attribute, attr) | |
221 | #define to_memmap_entry(obj) container_of(obj, struct firmware_map_entry, kobj) | |
222 | ||
223 | static ssize_t memmap_attr_show(struct kobject *kobj, | |
224 | struct attribute *attr, char *buf) | |
225 | { | |
226 | struct firmware_map_entry *entry = to_memmap_entry(kobj); | |
227 | struct memmap_attribute *memmap_attr = to_memmap_attr(attr); | |
228 | ||
229 | return memmap_attr->show(entry, buf); | |
230 | } | |
231 | ||
232 | /* | |
233 | * Initialises stuff and adds the entries in the map_entries list to | |
234 | * sysfs. Important is that firmware_map_add() and firmware_map_add_early() | |
31bad924 BW |
235 | * must be called before late_initcall. That's just because that function |
236 | * is called as late_initcall() function, which means that if you call | |
237 | * firmware_map_add() or firmware_map_add_early() afterwards, the entries | |
238 | * are not added to sysfs. | |
69ac9cd6 BW |
239 | */ |
240 | static int __init memmap_init(void) | |
241 | { | |
69ac9cd6 | 242 | struct firmware_map_entry *entry; |
69ac9cd6 | 243 | |
d96ae530 AM |
244 | list_for_each_entry(entry, &map_entries, list) |
245 | add_sysfs_fw_map_entry(entry); | |
69ac9cd6 BW |
246 | |
247 | return 0; | |
248 | } | |
249 | late_initcall(memmap_init); | |
250 |