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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/firmware/memmap.c
4 * Copyright (C) 2008 SUSE LINUX Products GmbH
5 * by Bernhard Walle <bernhard.walle@gmx.de>
6 */
7
8#include <linux/string.h>
9#include <linux/firmware-map.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/memblock.h>
14#include <linux/slab.h>
15#include <linux/mm.h>
16
17/*
18 * Data types ------------------------------------------------------------------
19 */
20
21/*
22 * Firmware map entry. Because firmware memory maps are flat and not
23 * hierarchical, it's ok to organise them in a linked list. No parent
24 * information is necessary as for the resource tree.
25 */
26struct firmware_map_entry {
27 /*
28 * start and end must be u64 rather than resource_size_t, because e820
29 * resources can lie at addresses above 4G.
30 */
31 u64 start; /* start of the memory range */
32 u64 end; /* end of the memory range (incl.) */
33 const char *type; /* type of the memory range */
34 struct list_head list; /* entry for the linked list */
35 struct kobject kobj; /* kobject for each entry */
36};
37
38/*
39 * Forward declarations --------------------------------------------------------
40 */
41static ssize_t memmap_attr_show(struct kobject *kobj,
42 struct attribute *attr, char *buf);
43static ssize_t start_show(struct firmware_map_entry *entry, char *buf);
44static ssize_t end_show(struct firmware_map_entry *entry, char *buf);
45static ssize_t type_show(struct firmware_map_entry *entry, char *buf);
46
47static struct firmware_map_entry * __meminit
48firmware_map_find_entry(u64 start, u64 end, const char *type);
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
59static struct memmap_attribute memmap_start_attr = __ATTR_RO(start);
60static struct memmap_attribute memmap_end_attr = __ATTR_RO(end);
61static struct 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};
72ATTRIBUTE_GROUPS(def);
73
74static const struct sysfs_ops memmap_attr_ops = {
75 .show = memmap_attr_show,
76};
77
78/* Firmware memory map entries. */
79static LIST_HEAD(map_entries);
80static DEFINE_SPINLOCK(map_entries_lock);
81
82/*
83 * For memory hotplug, there is no way to free memory map entries allocated
84 * by boot mem after the system is up. So when we hot-remove memory whose
85 * map entry is allocated by bootmem, we need to remember the storage and
86 * reuse it when the memory is hot-added again.
87 */
88static LIST_HEAD(map_entries_bootmem);
89static DEFINE_SPINLOCK(map_entries_bootmem_lock);
90
91
92static inline struct firmware_map_entry *
93to_memmap_entry(struct kobject *kobj)
94{
95 return container_of(kobj, struct firmware_map_entry, kobj);
96}
97
98static void __meminit release_firmware_map_entry(struct kobject *kobj)
99{
100 struct firmware_map_entry *entry = to_memmap_entry(kobj);
101
102 if (PageReserved(virt_to_page(entry))) {
103 /*
104 * Remember the storage allocated by bootmem, and reuse it when
105 * the memory is hot-added again. The entry will be added to
106 * map_entries_bootmem here, and deleted from &map_entries in
107 * firmware_map_remove_entry().
108 */
109 spin_lock(&map_entries_bootmem_lock);
110 list_add(&entry->list, &map_entries_bootmem);
111 spin_unlock(&map_entries_bootmem_lock);
112
113 return;
114 }
115
116 kfree(entry);
117}
118
119static const struct kobj_type memmap_ktype = {
120 .release = release_firmware_map_entry,
121 .sysfs_ops = &memmap_attr_ops,
122 .default_groups = def_groups,
123};
124
125/*
126 * Registration functions ------------------------------------------------------
127 */
128
129/**
130 * firmware_map_add_entry() - Does the real work to add a firmware memmap entry.
131 * @start: Start of the memory range.
132 * @end: End of the memory range (exclusive).
133 * @type: Type of the memory range.
134 * @entry: Pre-allocated (either kmalloc() or bootmem allocator), uninitialised
135 * entry.
136 *
137 * Common implementation of firmware_map_add() and firmware_map_add_early()
138 * which expects a pre-allocated struct firmware_map_entry.
139 *
140 * Return: 0 always
141 */
142static int firmware_map_add_entry(u64 start, u64 end,
143 const char *type,
144 struct firmware_map_entry *entry)
145{
146 BUG_ON(start > end);
147
148 entry->start = start;
149 entry->end = end - 1;
150 entry->type = type;
151 INIT_LIST_HEAD(&entry->list);
152 kobject_init(&entry->kobj, &memmap_ktype);
153
154 spin_lock(&map_entries_lock);
155 list_add_tail(&entry->list, &map_entries);
156 spin_unlock(&map_entries_lock);
157
158 return 0;
159}
160
161/**
162 * firmware_map_remove_entry() - Does the real work to remove a firmware
163 * memmap entry.
164 * @entry: removed entry.
165 *
166 * The caller must hold map_entries_lock, and release it properly.
167 */
168static inline void firmware_map_remove_entry(struct firmware_map_entry *entry)
169{
170 list_del(&entry->list);
171}
172
173/*
174 * Add memmap entry on sysfs
175 */
176static int add_sysfs_fw_map_entry(struct firmware_map_entry *entry)
177{
178 static int map_entries_nr;
179 static struct kset *mmap_kset;
180
181 if (entry->kobj.state_in_sysfs)
182 return -EEXIST;
183
184 if (!mmap_kset) {
185 mmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj);
186 if (!mmap_kset)
187 return -ENOMEM;
188 }
189
190 entry->kobj.kset = mmap_kset;
191 if (kobject_add(&entry->kobj, NULL, "%d", map_entries_nr++))
192 kobject_put(&entry->kobj);
193
194 return 0;
195}
196
197/*
198 * Remove memmap entry on sysfs
199 */
200static inline void remove_sysfs_fw_map_entry(struct firmware_map_entry *entry)
201{
202 kobject_put(&entry->kobj);
203}
204
205/**
206 * firmware_map_find_entry_in_list() - Search memmap entry in a given list.
207 * @start: Start of the memory range.
208 * @end: End of the memory range (exclusive).
209 * @type: Type of the memory range.
210 * @list: In which to find the entry.
211 *
212 * This function is to find the memmap entey of a given memory range in a
213 * given list. The caller must hold map_entries_lock, and must not release
214 * the lock until the processing of the returned entry has completed.
215 *
216 * Return: Pointer to the entry to be found on success, or NULL on failure.
217 */
218static struct firmware_map_entry * __meminit
219firmware_map_find_entry_in_list(u64 start, u64 end, const char *type,
220 struct list_head *list)
221{
222 struct firmware_map_entry *entry;
223
224 list_for_each_entry(entry, list, list)
225 if ((entry->start == start) && (entry->end == end) &&
226 (!strcmp(entry->type, type))) {
227 return entry;
228 }
229
230 return NULL;
231}
232
233/**
234 * firmware_map_find_entry() - Search memmap entry in map_entries.
235 * @start: Start of the memory range.
236 * @end: End of the memory range (exclusive).
237 * @type: Type of the memory range.
238 *
239 * This function is to find the memmap entey of a given memory range.
240 * The caller must hold map_entries_lock, and must not release the lock
241 * until the processing of the returned entry has completed.
242 *
243 * Return: Pointer to the entry to be found on success, or NULL on failure.
244 */
245static struct firmware_map_entry * __meminit
246firmware_map_find_entry(u64 start, u64 end, const char *type)
247{
248 return firmware_map_find_entry_in_list(start, end, type, &map_entries);
249}
250
251/**
252 * firmware_map_find_entry_bootmem() - Search memmap entry in map_entries_bootmem.
253 * @start: Start of the memory range.
254 * @end: End of the memory range (exclusive).
255 * @type: Type of the memory range.
256 *
257 * This function is similar to firmware_map_find_entry except that it find the
258 * given entry in map_entries_bootmem.
259 *
260 * Return: Pointer to the entry to be found on success, or NULL on failure.
261 */
262static struct firmware_map_entry * __meminit
263firmware_map_find_entry_bootmem(u64 start, u64 end, const char *type)
264{
265 return firmware_map_find_entry_in_list(start, end, type,
266 &map_entries_bootmem);
267}
268
269/**
270 * firmware_map_add_hotplug() - Adds a firmware mapping entry when we do
271 * memory hotplug.
272 * @start: Start of the memory range.
273 * @end: End of the memory range (exclusive)
274 * @type: Type of the memory range.
275 *
276 * Adds a firmware mapping entry. This function is for memory hotplug, it is
277 * similar to function firmware_map_add_early(). The only difference is that
278 * it will create the syfs entry dynamically.
279 *
280 * Return: 0 on success, or -ENOMEM if no memory could be allocated.
281 */
282int __meminit firmware_map_add_hotplug(u64 start, u64 end, const char *type)
283{
284 struct firmware_map_entry *entry;
285
286 entry = firmware_map_find_entry(start, end - 1, type);
287 if (entry)
288 return 0;
289
290 entry = firmware_map_find_entry_bootmem(start, end - 1, type);
291 if (!entry) {
292 entry = kzalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC);
293 if (!entry)
294 return -ENOMEM;
295 } else {
296 /* Reuse storage allocated by bootmem. */
297 spin_lock(&map_entries_bootmem_lock);
298 list_del(&entry->list);
299 spin_unlock(&map_entries_bootmem_lock);
300
301 memset(entry, 0, sizeof(*entry));
302 }
303
304 firmware_map_add_entry(start, end, type, entry);
305 /* create the memmap entry */
306 add_sysfs_fw_map_entry(entry);
307
308 return 0;
309}
310
311/**
312 * firmware_map_add_early() - Adds a firmware mapping entry.
313 * @start: Start of the memory range.
314 * @end: End of the memory range.
315 * @type: Type of the memory range.
316 *
317 * Adds a firmware mapping entry. This function uses the bootmem allocator
318 * for memory allocation.
319 *
320 * That function must be called before late_initcall.
321 *
322 * Return: 0 on success, or -ENOMEM if no memory could be allocated.
323 */
324int __init firmware_map_add_early(u64 start, u64 end, const char *type)
325{
326 struct firmware_map_entry *entry;
327
328 entry = memblock_alloc(sizeof(struct firmware_map_entry),
329 SMP_CACHE_BYTES);
330 if (WARN_ON(!entry))
331 return -ENOMEM;
332
333 return firmware_map_add_entry(start, end, type, entry);
334}
335
336/**
337 * firmware_map_remove() - remove a firmware mapping entry
338 * @start: Start of the memory range.
339 * @end: End of the memory range.
340 * @type: Type of the memory range.
341 *
342 * removes a firmware mapping entry.
343 *
344 * Return: 0 on success, or -EINVAL if no entry.
345 */
346int __meminit firmware_map_remove(u64 start, u64 end, const char *type)
347{
348 struct firmware_map_entry *entry;
349
350 spin_lock(&map_entries_lock);
351 entry = firmware_map_find_entry(start, end - 1, type);
352 if (!entry) {
353 spin_unlock(&map_entries_lock);
354 return -EINVAL;
355 }
356
357 firmware_map_remove_entry(entry);
358 spin_unlock(&map_entries_lock);
359
360 /* remove the memmap entry */
361 remove_sysfs_fw_map_entry(entry);
362
363 return 0;
364}
365
366/*
367 * Sysfs functions -------------------------------------------------------------
368 */
369
370static ssize_t start_show(struct firmware_map_entry *entry, char *buf)
371{
372 return snprintf(buf, PAGE_SIZE, "0x%llx\n",
373 (unsigned long long)entry->start);
374}
375
376static ssize_t end_show(struct firmware_map_entry *entry, char *buf)
377{
378 return snprintf(buf, PAGE_SIZE, "0x%llx\n",
379 (unsigned long long)entry->end);
380}
381
382static ssize_t type_show(struct firmware_map_entry *entry, char *buf)
383{
384 return snprintf(buf, PAGE_SIZE, "%s\n", entry->type);
385}
386
387static inline struct memmap_attribute *to_memmap_attr(struct attribute *attr)
388{
389 return container_of(attr, struct memmap_attribute, attr);
390}
391
392static ssize_t memmap_attr_show(struct kobject *kobj,
393 struct attribute *attr, char *buf)
394{
395 struct firmware_map_entry *entry = to_memmap_entry(kobj);
396 struct memmap_attribute *memmap_attr = to_memmap_attr(attr);
397
398 return memmap_attr->show(entry, buf);
399}
400
401/*
402 * Initialises stuff and adds the entries in the map_entries list to
403 * sysfs. Important is that firmware_map_add() and firmware_map_add_early()
404 * must be called before late_initcall. That's just because that function
405 * is called as late_initcall() function, which means that if you call
406 * firmware_map_add() or firmware_map_add_early() afterwards, the entries
407 * are not added to sysfs.
408 */
409static int __init firmware_memmap_init(void)
410{
411 struct firmware_map_entry *entry;
412
413 list_for_each_entry(entry, &map_entries, list)
414 add_sysfs_fw_map_entry(entry);
415
416 return 0;
417}
418late_initcall(firmware_memmap_init);
419
1/*
2 * linux/drivers/firmware/memmap.c
3 * Copyright (C) 2008 SUSE LINUX Products GmbH
4 * by Bernhard Walle <bernhard.walle@gmx.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#include <linux/slab.h>
24#include <linux/mm.h>
25
26/*
27 * Data types ------------------------------------------------------------------
28 */
29
30/*
31 * Firmware map entry. Because firmware memory maps are flat and not
32 * hierarchical, it's ok to organise them in a linked list. No parent
33 * information is necessary as for the resource tree.
34 */
35struct firmware_map_entry {
36 /*
37 * start and end must be u64 rather than resource_size_t, because e820
38 * resources can lie at addresses above 4G.
39 */
40 u64 start; /* start of the memory range */
41 u64 end; /* end of the memory range (incl.) */
42 const char *type; /* type of the memory range */
43 struct list_head list; /* entry for the linked list */
44 struct kobject kobj; /* kobject for each entry */
45};
46
47/*
48 * Forward declarations --------------------------------------------------------
49 */
50static ssize_t memmap_attr_show(struct kobject *kobj,
51 struct attribute *attr, char *buf);
52static ssize_t start_show(struct firmware_map_entry *entry, char *buf);
53static ssize_t end_show(struct firmware_map_entry *entry, char *buf);
54static ssize_t type_show(struct firmware_map_entry *entry, char *buf);
55
56static struct firmware_map_entry * __meminit
57firmware_map_find_entry(u64 start, u64 end, const char *type);
58
59/*
60 * Static data -----------------------------------------------------------------
61 */
62
63struct memmap_attribute {
64 struct attribute attr;
65 ssize_t (*show)(struct firmware_map_entry *entry, char *buf);
66};
67
68static struct memmap_attribute memmap_start_attr = __ATTR_RO(start);
69static struct memmap_attribute memmap_end_attr = __ATTR_RO(end);
70static struct memmap_attribute memmap_type_attr = __ATTR_RO(type);
71
72/*
73 * These are default attributes that are added for every memmap entry.
74 */
75static struct attribute *def_attrs[] = {
76 &memmap_start_attr.attr,
77 &memmap_end_attr.attr,
78 &memmap_type_attr.attr,
79 NULL
80};
81
82static const struct sysfs_ops memmap_attr_ops = {
83 .show = memmap_attr_show,
84};
85
86/* Firmware memory map entries. */
87static LIST_HEAD(map_entries);
88static DEFINE_SPINLOCK(map_entries_lock);
89
90/*
91 * For memory hotplug, there is no way to free memory map entries allocated
92 * by boot mem after the system is up. So when we hot-remove memory whose
93 * map entry is allocated by bootmem, we need to remember the storage and
94 * reuse it when the memory is hot-added again.
95 */
96static LIST_HEAD(map_entries_bootmem);
97static DEFINE_SPINLOCK(map_entries_bootmem_lock);
98
99
100static inline struct firmware_map_entry *
101to_memmap_entry(struct kobject *kobj)
102{
103 return container_of(kobj, struct firmware_map_entry, kobj);
104}
105
106static void __meminit release_firmware_map_entry(struct kobject *kobj)
107{
108 struct firmware_map_entry *entry = to_memmap_entry(kobj);
109
110 if (PageReserved(virt_to_page(entry))) {
111 /*
112 * Remember the storage allocated by bootmem, and reuse it when
113 * the memory is hot-added again. The entry will be added to
114 * map_entries_bootmem here, and deleted from &map_entries in
115 * firmware_map_remove_entry().
116 */
117 spin_lock(&map_entries_bootmem_lock);
118 list_add(&entry->list, &map_entries_bootmem);
119 spin_unlock(&map_entries_bootmem_lock);
120
121 return;
122 }
123
124 kfree(entry);
125}
126
127static struct kobj_type __refdata memmap_ktype = {
128 .release = release_firmware_map_entry,
129 .sysfs_ops = &memmap_attr_ops,
130 .default_attrs = def_attrs,
131};
132
133/*
134 * Registration functions ------------------------------------------------------
135 */
136
137/**
138 * firmware_map_add_entry() - Does the real work to add a firmware memmap entry.
139 * @start: Start of the memory range.
140 * @end: End of the memory range (exclusive).
141 * @type: Type of the memory range.
142 * @entry: Pre-allocated (either kmalloc() or bootmem allocator), uninitialised
143 * entry.
144 *
145 * Common implementation of firmware_map_add() and firmware_map_add_early()
146 * which expects a pre-allocated struct firmware_map_entry.
147 *
148 * Return: 0 always
149 */
150static int firmware_map_add_entry(u64 start, u64 end,
151 const char *type,
152 struct firmware_map_entry *entry)
153{
154 BUG_ON(start > end);
155
156 entry->start = start;
157 entry->end = end - 1;
158 entry->type = type;
159 INIT_LIST_HEAD(&entry->list);
160 kobject_init(&entry->kobj, &memmap_ktype);
161
162 spin_lock(&map_entries_lock);
163 list_add_tail(&entry->list, &map_entries);
164 spin_unlock(&map_entries_lock);
165
166 return 0;
167}
168
169/**
170 * firmware_map_remove_entry() - Does the real work to remove a firmware
171 * memmap entry.
172 * @entry: removed entry.
173 *
174 * The caller must hold map_entries_lock, and release it properly.
175 */
176static inline void firmware_map_remove_entry(struct firmware_map_entry *entry)
177{
178 list_del(&entry->list);
179}
180
181/*
182 * Add memmap entry on sysfs
183 */
184static int add_sysfs_fw_map_entry(struct firmware_map_entry *entry)
185{
186 static int map_entries_nr;
187 static struct kset *mmap_kset;
188
189 if (entry->kobj.state_in_sysfs)
190 return -EEXIST;
191
192 if (!mmap_kset) {
193 mmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj);
194 if (!mmap_kset)
195 return -ENOMEM;
196 }
197
198 entry->kobj.kset = mmap_kset;
199 if (kobject_add(&entry->kobj, NULL, "%d", map_entries_nr++))
200 kobject_put(&entry->kobj);
201
202 return 0;
203}
204
205/*
206 * Remove memmap entry on sysfs
207 */
208static inline void remove_sysfs_fw_map_entry(struct firmware_map_entry *entry)
209{
210 kobject_put(&entry->kobj);
211}
212
213/**
214 * firmware_map_find_entry_in_list() - Search memmap entry in a given list.
215 * @start: Start of the memory range.
216 * @end: End of the memory range (exclusive).
217 * @type: Type of the memory range.
218 * @list: In which to find the entry.
219 *
220 * This function is to find the memmap entey of a given memory range in a
221 * given list. The caller must hold map_entries_lock, and must not release
222 * the lock until the processing of the returned entry has completed.
223 *
224 * Return: Pointer to the entry to be found on success, or NULL on failure.
225 */
226static struct firmware_map_entry * __meminit
227firmware_map_find_entry_in_list(u64 start, u64 end, const char *type,
228 struct list_head *list)
229{
230 struct firmware_map_entry *entry;
231
232 list_for_each_entry(entry, list, list)
233 if ((entry->start == start) && (entry->end == end) &&
234 (!strcmp(entry->type, type))) {
235 return entry;
236 }
237
238 return NULL;
239}
240
241/**
242 * firmware_map_find_entry() - Search memmap entry in map_entries.
243 * @start: Start of the memory range.
244 * @end: End of the memory range (exclusive).
245 * @type: Type of the memory range.
246 *
247 * This function is to find the memmap entey of a given memory range.
248 * The caller must hold map_entries_lock, and must not release the lock
249 * until the processing of the returned entry has completed.
250 *
251 * Return: Pointer to the entry to be found on success, or NULL on failure.
252 */
253static struct firmware_map_entry * __meminit
254firmware_map_find_entry(u64 start, u64 end, const char *type)
255{
256 return firmware_map_find_entry_in_list(start, end, type, &map_entries);
257}
258
259/**
260 * firmware_map_find_entry_bootmem() - Search memmap entry in map_entries_bootmem.
261 * @start: Start of the memory range.
262 * @end: End of the memory range (exclusive).
263 * @type: Type of the memory range.
264 *
265 * This function is similar to firmware_map_find_entry except that it find the
266 * given entry in map_entries_bootmem.
267 *
268 * Return: Pointer to the entry to be found on success, or NULL on failure.
269 */
270static struct firmware_map_entry * __meminit
271firmware_map_find_entry_bootmem(u64 start, u64 end, const char *type)
272{
273 return firmware_map_find_entry_in_list(start, end, type,
274 &map_entries_bootmem);
275}
276
277/**
278 * firmware_map_add_hotplug() - Adds a firmware mapping entry when we do
279 * memory hotplug.
280 * @start: Start of the memory range.
281 * @end: End of the memory range (exclusive)
282 * @type: Type of the memory range.
283 *
284 * Adds a firmware mapping entry. This function is for memory hotplug, it is
285 * similar to function firmware_map_add_early(). The only difference is that
286 * it will create the syfs entry dynamically.
287 *
288 * Return: 0 on success, or -ENOMEM if no memory could be allocated.
289 */
290int __meminit firmware_map_add_hotplug(u64 start, u64 end, const char *type)
291{
292 struct firmware_map_entry *entry;
293
294 entry = firmware_map_find_entry(start, end - 1, type);
295 if (entry)
296 return 0;
297
298 entry = firmware_map_find_entry_bootmem(start, end - 1, type);
299 if (!entry) {
300 entry = kzalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC);
301 if (!entry)
302 return -ENOMEM;
303 } else {
304 /* Reuse storage allocated by bootmem. */
305 spin_lock(&map_entries_bootmem_lock);
306 list_del(&entry->list);
307 spin_unlock(&map_entries_bootmem_lock);
308
309 memset(entry, 0, sizeof(*entry));
310 }
311
312 firmware_map_add_entry(start, end, type, entry);
313 /* create the memmap entry */
314 add_sysfs_fw_map_entry(entry);
315
316 return 0;
317}
318
319/**
320 * firmware_map_add_early() - Adds a firmware mapping entry.
321 * @start: Start of the memory range.
322 * @end: End of the memory range.
323 * @type: Type of the memory range.
324 *
325 * Adds a firmware mapping entry. This function uses the bootmem allocator
326 * for memory allocation.
327 *
328 * That function must be called before late_initcall.
329 *
330 * Return: 0 on success, or -ENOMEM if no memory could be allocated.
331 */
332int __init firmware_map_add_early(u64 start, u64 end, const char *type)
333{
334 struct firmware_map_entry *entry;
335
336 entry = memblock_virt_alloc(sizeof(struct firmware_map_entry), 0);
337 if (WARN_ON(!entry))
338 return -ENOMEM;
339
340 return firmware_map_add_entry(start, end, type, entry);
341}
342
343/**
344 * firmware_map_remove() - remove a firmware mapping entry
345 * @start: Start of the memory range.
346 * @end: End of the memory range.
347 * @type: Type of the memory range.
348 *
349 * removes a firmware mapping entry.
350 *
351 * Return: 0 on success, or -EINVAL if no entry.
352 */
353int __meminit firmware_map_remove(u64 start, u64 end, const char *type)
354{
355 struct firmware_map_entry *entry;
356
357 spin_lock(&map_entries_lock);
358 entry = firmware_map_find_entry(start, end - 1, type);
359 if (!entry) {
360 spin_unlock(&map_entries_lock);
361 return -EINVAL;
362 }
363
364 firmware_map_remove_entry(entry);
365 spin_unlock(&map_entries_lock);
366
367 /* remove the memmap entry */
368 remove_sysfs_fw_map_entry(entry);
369
370 return 0;
371}
372
373/*
374 * Sysfs functions -------------------------------------------------------------
375 */
376
377static ssize_t start_show(struct firmware_map_entry *entry, char *buf)
378{
379 return snprintf(buf, PAGE_SIZE, "0x%llx\n",
380 (unsigned long long)entry->start);
381}
382
383static ssize_t end_show(struct firmware_map_entry *entry, char *buf)
384{
385 return snprintf(buf, PAGE_SIZE, "0x%llx\n",
386 (unsigned long long)entry->end);
387}
388
389static ssize_t type_show(struct firmware_map_entry *entry, char *buf)
390{
391 return snprintf(buf, PAGE_SIZE, "%s\n", entry->type);
392}
393
394static inline struct memmap_attribute *to_memmap_attr(struct attribute *attr)
395{
396 return container_of(attr, struct memmap_attribute, attr);
397}
398
399static ssize_t memmap_attr_show(struct kobject *kobj,
400 struct attribute *attr, char *buf)
401{
402 struct firmware_map_entry *entry = to_memmap_entry(kobj);
403 struct memmap_attribute *memmap_attr = to_memmap_attr(attr);
404
405 return memmap_attr->show(entry, buf);
406}
407
408/*
409 * Initialises stuff and adds the entries in the map_entries list to
410 * sysfs. Important is that firmware_map_add() and firmware_map_add_early()
411 * must be called before late_initcall. That's just because that function
412 * is called as late_initcall() function, which means that if you call
413 * firmware_map_add() or firmware_map_add_early() afterwards, the entries
414 * are not added to sysfs.
415 */
416static int __init firmware_memmap_init(void)
417{
418 struct firmware_map_entry *entry;
419
420 list_for_each_entry(entry, &map_entries, list)
421 add_sysfs_fw_map_entry(entry);
422
423 return 0;
424}
425late_initcall(firmware_memmap_init);
426