6b13f685e
김민수
BSP 최초 추가
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#include <linux/string.h>
#include <linux/firmware-map.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/bootmem.h>
#include <linux/slab.h>
#include <linux/mm.h>
struct firmware_map_entry {
u64 start;
u64 end;
const char *type;
struct list_head list;
struct kobject kobj;
};
static ssize_t memmap_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf);
static ssize_t start_show(struct firmware_map_entry *entry, char *buf);
static ssize_t end_show(struct firmware_map_entry *entry, char *buf);
static ssize_t type_show(struct firmware_map_entry *entry, char *buf);
static struct firmware_map_entry * __meminit
firmware_map_find_entry(u64 start, u64 end, const char *type);
struct memmap_attribute {
struct attribute attr;
ssize_t (*show)(struct firmware_map_entry *entry, char *buf);
};
static struct memmap_attribute memmap_start_attr = __ATTR_RO(start);
static struct memmap_attribute memmap_end_attr = __ATTR_RO(end);
static struct memmap_attribute memmap_type_attr = __ATTR_RO(type);
static struct attribute *def_attrs[] = {
&memmap_start_attr.attr,
&memmap_end_attr.attr,
&memmap_type_attr.attr,
NULL
};
static const struct sysfs_ops memmap_attr_ops = {
.show = memmap_attr_show,
};
static LIST_HEAD(map_entries);
static DEFINE_SPINLOCK(map_entries_lock);
static LIST_HEAD(map_entries_bootmem);
static DEFINE_SPINLOCK(map_entries_bootmem_lock);
static inline struct firmware_map_entry *
to_memmap_entry(struct kobject *kobj)
{
return container_of(kobj, struct firmware_map_entry, kobj);
}
static void __meminit release_firmware_map_entry(struct kobject *kobj)
{
struct firmware_map_entry *entry = to_memmap_entry(kobj);
if (PageReserved(virt_to_page(entry))) {
spin_lock(&map_entries_bootmem_lock);
list_add(&entry->list, &map_entries_bootmem);
spin_unlock(&map_entries_bootmem_lock);
return;
}
kfree(entry);
}
static struct kobj_type __refdata memmap_ktype = {
.release = release_firmware_map_entry,
.sysfs_ops = &memmap_attr_ops,
.default_attrs = def_attrs,
};
static int firmware_map_add_entry(u64 start, u64 end,
const char *type,
struct firmware_map_entry *entry)
{
BUG_ON(start > end);
entry->start = start;
entry->end = end - 1;
entry->type = type;
INIT_LIST_HEAD(&entry->list);
kobject_init(&entry->kobj, &memmap_ktype);
spin_lock(&map_entries_lock);
list_add_tail(&entry->list, &map_entries);
spin_unlock(&map_entries_lock);
return 0;
}
static inline void firmware_map_remove_entry(struct firmware_map_entry *entry)
{
list_del(&entry->list);
}
static int add_sysfs_fw_map_entry(struct firmware_map_entry *entry)
{
static int map_entries_nr;
static struct kset *mmap_kset;
if (!mmap_kset) {
mmap_kset = kset_create_and_add("memmap", NULL, firmware_kobj);
if (!mmap_kset)
return -ENOMEM;
}
entry->kobj.kset = mmap_kset;
if (kobject_add(&entry->kobj, NULL, "%d", map_entries_nr++))
kobject_put(&entry->kobj);
return 0;
}
static inline void remove_sysfs_fw_map_entry(struct firmware_map_entry *entry)
{
kobject_put(&entry->kobj);
}
static struct firmware_map_entry * __meminit
firmware_map_find_entry_in_list(u64 start, u64 end, const char *type,
struct list_head *list)
{
struct firmware_map_entry *entry;
list_for_each_entry(entry, list, list)
if ((entry->start == start) && (entry->end == end) &&
(!strcmp(entry->type, type))) {
return entry;
}
return NULL;
}
static struct firmware_map_entry * __meminit
firmware_map_find_entry(u64 start, u64 end, const char *type)
{
return firmware_map_find_entry_in_list(start, end, type, &map_entries);
}
static struct firmware_map_entry * __meminit
firmware_map_find_entry_bootmem(u64 start, u64 end, const char *type)
{
return firmware_map_find_entry_in_list(start, end, type,
&map_entries_bootmem);
}
int __meminit firmware_map_add_hotplug(u64 start, u64 end, const char *type)
{
struct firmware_map_entry *entry;
entry = firmware_map_find_entry_bootmem(start, end, type);
if (!entry) {
entry = kzalloc(sizeof(struct firmware_map_entry), GFP_ATOMIC);
if (!entry)
return -ENOMEM;
} else {
spin_lock(&map_entries_bootmem_lock);
list_del(&entry->list);
spin_unlock(&map_entries_bootmem_lock);
memset(entry, 0, sizeof(*entry));
}
firmware_map_add_entry(start, end, type, entry);
add_sysfs_fw_map_entry(entry);
return 0;
}
int __init firmware_map_add_early(u64 start, u64 end, const char *type)
{
struct firmware_map_entry *entry;
entry = memblock_virt_alloc(sizeof(struct firmware_map_entry), 0);
if (WARN_ON(!entry))
return -ENOMEM;
return firmware_map_add_entry(start, end, type, entry);
}
int __meminit firmware_map_remove(u64 start, u64 end, const char *type)
{
struct firmware_map_entry *entry;
spin_lock(&map_entries_lock);
entry = firmware_map_find_entry(start, end - 1, type);
if (!entry) {
spin_unlock(&map_entries_lock);
return -EINVAL;
}
firmware_map_remove_entry(entry);
spin_unlock(&map_entries_lock);
remove_sysfs_fw_map_entry(entry);
return 0;
}
static ssize_t start_show(struct firmware_map_entry *entry, char *buf)
{
return snprintf(buf, PAGE_SIZE, "0x%llx
",
(unsigned long long)entry->start);
}
static ssize_t end_show(struct firmware_map_entry *entry, char *buf)
{
return snprintf(buf, PAGE_SIZE, "0x%llx
",
(unsigned long long)entry->end);
}
static ssize_t type_show(struct firmware_map_entry *entry, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s
", entry->type);
}
static inline struct memmap_attribute *to_memmap_attr(struct attribute *attr)
{
return container_of(attr, struct memmap_attribute, attr);
}
static ssize_t memmap_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct firmware_map_entry *entry = to_memmap_entry(kobj);
struct memmap_attribute *memmap_attr = to_memmap_attr(attr);
return memmap_attr->show(entry, buf);
}
static int __init firmware_memmap_init(void)
{
struct firmware_map_entry *entry;
list_for_each_entry(entry, &map_entries, list)
add_sysfs_fw_map_entry(entry);
return 0;
}
late_initcall(firmware_memmap_init);
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