// 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/initrd.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/zstd.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);
struct firmware_cache fw_cache;
bool fw_load_abort_all;
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,
size_t size,
size_t offset,
u32 opt_flags)
{
struct fw_priv *fw_priv;
/* For a partial read, the buffer must be preallocated. */
if ((opt_flags & FW_OPT_PARTIAL) && !dbuf)
return NULL;
/* Only partial reads are allowed to use an offset. */
if (offset != 0 && !(opt_flags & FW_OPT_PARTIAL))
return NULL
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