1 // SPDX-License-Identifier: GPL-2.0-only
9 #include <linux/firmware-map.h>
18  * Data types ------------------------------------------------------------------
39  * Forward declarations --------------------------------------------------------
51  * Static data -----------------------------------------------------------------
83  * by boot mem after the system is up. So when we hot-remove memory whose
85  * reuse it when the memory is hot-added again.
104 		 * the memory is hot-added again. The entry will be added to  in release_firmware_map_entry()
109 		list_add(&entry->list, &map_entries_bootmem);  in release_firmware_map_entry()
125  * Registration functions ------------------------------------------------------
129  * firmware_map_add_entry() - Does the real work to add a firmware memmap entry.
133  * @entry: Pre-allocated (either kmalloc() or bootmem allocator), uninitialised
137  * which expects a pre-allocated struct firmware_map_entry.
147 	entry->start = start;  in firmware_map_add_entry()
148 	entry->end = end - 1;  in firmware_map_add_entry()
149 	entry->type = type;  in firmware_map_add_entry()
150 	INIT_LIST_HEAD(&entry->list);  in firmware_map_add_entry()
151 	kobject_init(&entry->kobj, &memmap_ktype);  in firmware_map_add_entry()
154 	list_add_tail(&entry->list, &map_entries);  in firmware_map_add_entry()
161  * firmware_map_remove_entry() - Does the real work to remove a firmware
169 	list_del(&entry->list);  in firmware_map_remove_entry()
180 	if (entry->kobj.state_in_sysfs)  in add_sysfs_fw_map_entry()
181 		return -EEXIST;  in add_sysfs_fw_map_entry()
186 			return -ENOMEM;  in add_sysfs_fw_map_entry()
189 	entry->kobj.kset = mmap_kset;  in add_sysfs_fw_map_entry()
190 	if (kobject_add(&entry->kobj, NULL, "%d", map_entries_nr++))  in add_sysfs_fw_map_entry()
191 		kobject_put(&entry->kobj);  in add_sysfs_fw_map_entry()
201 	kobject_put(&entry->kobj);  in remove_sysfs_fw_map_entry()
205  * firmware_map_find_entry_in_list() - Search memmap entry in a given list.
213  * the lock until the processing of the returned entry has completed.
224 		if ((entry->start == start) && (entry->end == end) &&  in firmware_map_find_entry_in_list()
225 		    (!strcmp(entry->type, type))) {  in firmware_map_find_entry_in_list()
233  * firmware_map_find_entry() - Search memmap entry in map_entries.
240  * until the processing of the returned entry has completed.
251  * firmware_map_find_entry_bootmem() - Search memmap entry in map_entries_bootmem.
269  * firmware_map_add_hotplug() - Adds a firmware mapping entry when we do
279  * Return: 0 on success, or -ENOMEM if no memory could be allocated.
285 	entry = firmware_map_find_entry(start, end - 1, type);  in firmware_map_add_hotplug()
289 	entry = firmware_map_find_entry_bootmem(start, end - 1, type);  in firmware_map_add_hotplug()
293 			return -ENOMEM;  in firmware_map_add_hotplug()
297 		list_del(&entry->list);  in firmware_map_add_hotplug()
311  * firmware_map_add_early() - Adds a firmware mapping entry.
321  * Return: 0 on success, or -ENOMEM if no memory could be allocated.
330 		return -ENOMEM;  in firmware_map_add_early()
336  * firmware_map_remove() - remove a firmware mapping entry
343  * Return: 0 on success, or -EINVAL if no entry.
350 	entry = firmware_map_find_entry(start, end - 1, type);  in firmware_map_remove()
353 		return -EINVAL;  in firmware_map_remove()
366  * Sysfs functions -------------------------------------------------------------
372 		(unsigned long long)entry->start);  in start_show()
378 		(unsigned long long)entry->end);  in end_show()
383 	return snprintf(buf, PAGE_SIZE, "%s\n", entry->type);  in type_show()
397 	return memmap_attr->show(entry, buf);  in memmap_attr_show()