// SPDX-License-Identifier: GPL-2.0
/*
* main.c - Multi purpose firmware loading support
*
* Copyright (c) 2003 Manuel Estrada Sainz
*
* Please see Documentation/driver-api/firmware/ for more information.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/capability.h>
#include <linux/device.h>
#include <linux/kernel_read_file.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/vmalloc.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/highmem.h>
#include <linux/firmware.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/file.h>
#include <linux/list.h>
#include <linux/fs.h>
#include <linux/async.h>
#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/syscore_ops.h>
#include <linux/reboot.h>
#include <linux/security.h>
#include <linux/xz.h>
#include <generated/utsrelease.h>
#include "../base.h"
#include "firmware.h"
#include "fallback.h"
MODULE_AUTHOR("Manuel Estrada Sainz");
MODULE_DESCRIPTION("Multi purpose firmware loading support");
MODULE_LICENSE("GPL");
struct firmware_cache {
/* firmware_buf instance will be added into the below list */
spinlock_t lock;
struct list_head head;
int state;
#ifdef CONFIG_FW_CACHE
/*
* Names of firmware images which have been cached successfully
* will be added into the below list so that device uncache
* helper can trace which firmware images have been cached
* before.
*/
spinlock_t name_lock;
struct list_head fw_names;
struct delayed_work work;
struct notifier_block pm_notify;
#endif
};
struct fw_cache_entry {
struct list_head list;
const char *name;
};
struct fw_name_devm {
unsigned long magic;
const char *name;
};
static inline struct fw_priv *to_fw_priv(struct kref *ref)
{
return container_of(ref, struct fw_priv, ref);
}
#define FW_LOADER_NO_CACHE 0
#define FW_LOADER_START_CACHE 1
/* fw_lock could be moved to 'struct fw_sysfs' but since it is just
* guarding for corner cases a global lock should be OK */
DEFINE_MUTEX(fw_lock);
static struct firmware_cache fw_cache;
/* Builtin firmware support */
#ifdef CONFIG_FW_LOADER
extern struct builtin_fw __start_builtin_fw[];
extern struct builtin_fw __end_builtin_fw[];
static bool fw_copy_to_prealloc_buf(struct firmware *fw,
void *buf, size_t size)
{
if (!buf)
return true;
if (size < fw->size)
return false;
memcpy(buf, fw->data, fw->size);
return true;
}
static bool fw_get_builtin_firmware(struct firmware *fw, const char *name,
void *buf, size_t size)
{
struct builtin_fw *b_fw;
for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
if (strcmp(name, b_fw->name) == 0) {
fw->size = b_fw->size;
fw->data = b_fw->data;
return fw_copy_to_prealloc_buf(fw, buf, size);
}
}
return false;
}
static bool fw_is_builtin_firmware(const struct firmware *fw)
{
struct builtin_fw *b_fw;
for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++)
if (fw->data == b_fw->data)
return true;
return false;
}
#else /* Module case - no builtin firmware support */
static inline bool fw_get_builtin_firmware(struct firmware *fw,
const char *name, void *buf,
size_t size)
{
return false;
}
static inline bool fw_is_builtin_firmware(const struct firmware *fw)
{
return false;
}
#endif
static void fw_state_init(struct fw_priv *fw_priv)
{
struct fw_state *fw_st = &fw_priv->fw_st;
init_completion(&fw_st->completion);
fw_st->status = FW_STATUS_UNKNOWN;
}
static inline int fw_state_wait(struct fw_priv *fw_priv)
{
return __fw_state_wait_common(fw_priv, MAX_SCHEDULE_TIMEOUT);
}
static void fw_cache_piggyback_on_request(struct fw_priv *fw_priv);
static struct fw_priv *__allocate_fw_priv(const char *fw_name,
struct firmware_cache *fwc,
void *dbuf,
| 