153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __FIRMWARE_LOADER_H
|
|
#define __FIRMWARE_LOADER_H
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/firmware.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/list.h>
|
|
#include <linux/completion.h>
|
|
|
|
#include <generated/utsrelease.h>
|
|
|
|
/**
|
|
* enum fw_opt - options to control firmware loading behaviour
|
|
*
|
|
* @FW_OPT_UEVENT: Enables the fallback mechanism to send a kobject uevent
|
|
* when the firmware is not found. Userspace is in charge to load the
|
|
* firmware using the sysfs loading facility.
|
|
* @FW_OPT_NOWAIT: Used to describe the firmware request is asynchronous.
|
|
* @FW_OPT_USERHELPER: Enable the fallback mechanism, in case the direct
|
|
* filesystem lookup fails at finding the firmware. For details refer to
|
|
* firmware_fallback_sysfs().
|
|
* @FW_OPT_NO_WARN: Quiet, avoid printing warning messages.
|
|
* @FW_OPT_NOCACHE: Disables firmware caching. Firmware caching is used to
|
|
* cache the firmware upon suspend, so that upon resume races against the
|
|
* firmware file lookup on storage is avoided. Used for calls where the
|
|
* file may be too big, or where the driver takes charge of its own
|
|
* firmware caching mechanism.
|
|
* @FW_OPT_NOFALLBACK_SYSFS: Disable the sysfs fallback mechanism. Takes
|
|
* precedence over &FW_OPT_UEVENT and &FW_OPT_USERHELPER.
|
|
* @FW_OPT_FALLBACK_PLATFORM: Enable fallback to device fw copy embedded in
|
|
* the platform's main firmware. If both this fallback and the sysfs
|
|
* fallback are enabled, then this fallback will be tried first.
|
|
*/
|
|
enum fw_opt {
|
|
FW_OPT_UEVENT = BIT(0),
|
|
FW_OPT_NOWAIT = BIT(1),
|
|
FW_OPT_USERHELPER = BIT(2),
|
|
FW_OPT_NO_WARN = BIT(3),
|
|
FW_OPT_NOCACHE = BIT(4),
|
|
FW_OPT_NOFALLBACK_SYSFS = BIT(5),
|
|
FW_OPT_FALLBACK_PLATFORM = BIT(6),
|
|
};
|
|
|
|
enum fw_status {
|
|
FW_STATUS_UNKNOWN,
|
|
FW_STATUS_LOADING,
|
|
FW_STATUS_DONE,
|
|
FW_STATUS_ABORTED,
|
|
};
|
|
|
|
/*
|
|
* Concurrent request_firmware() for the same firmware need to be
|
|
* serialized. struct fw_state is simple state machine which hold the
|
|
* state of the firmware loading.
|
|
*/
|
|
struct fw_state {
|
|
struct completion completion;
|
|
enum fw_status status;
|
|
};
|
|
|
|
struct fw_priv {
|
|
struct kref ref;
|
|
struct list_head list;
|
|
struct firmware_cache *fwc;
|
|
struct fw_state fw_st;
|
|
void *data;
|
|
size_t size;
|
|
size_t allocated_size;
|
|
#ifdef CONFIG_FW_LOADER_PAGED_BUF
|
|
bool is_paged_buf;
|
|
struct page **pages;
|
|
int nr_pages;
|
|
int page_array_size;
|
|
#endif
|
|
#ifdef CONFIG_FW_LOADER_USER_HELPER
|
|
bool need_uevent;
|
|
struct list_head pending_list;
|
|
#endif
|
|
const char *fw_name;
|
|
};
|
|
|
|
extern struct mutex fw_lock;
|
|
|
|
static inline bool __fw_state_check(struct fw_priv *fw_priv,
|
|
enum fw_status status)
|
|
{
|
|
struct fw_state *fw_st = &fw_priv->fw_st;
|
|
|
|
return fw_st->status == status;
|
|
}
|
|
|
|
static inline int __fw_state_wait_common(struct fw_priv *fw_priv, long timeout)
|
|
{
|
|
struct fw_state *fw_st = &fw_priv->fw_st;
|
|
long ret;
|
|
|
|
ret = wait_for_completion_killable_timeout(&fw_st->completion, timeout);
|
|
if (ret != 0 && fw_st->status == FW_STATUS_ABORTED)
|
|
return -ENOENT;
|
|
if (!ret)
|
|
return -ETIMEDOUT;
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
static inline void __fw_state_set(struct fw_priv *fw_priv,
|
|
enum fw_status status)
|
|
{
|
|
struct fw_state *fw_st = &fw_priv->fw_st;
|
|
|
|
WRITE_ONCE(fw_st->status, status);
|
|
|
|
if (status == FW_STATUS_DONE || status == FW_STATUS_ABORTED)
|
|
complete_all(&fw_st->completion);
|
|
}
|
|
|
|
static inline void fw_state_aborted(struct fw_priv *fw_priv)
|
|
{
|
|
__fw_state_set(fw_priv, FW_STATUS_ABORTED);
|
|
}
|
|
|
|
static inline bool fw_state_is_aborted(struct fw_priv *fw_priv)
|
|
{
|
|
return __fw_state_check(fw_priv, FW_STATUS_ABORTED);
|
|
}
|
|
|
|
static inline void fw_state_start(struct fw_priv *fw_priv)
|
|
{
|
|
__fw_state_set(fw_priv, FW_STATUS_LOADING);
|
|
}
|
|
|
|
static inline void fw_state_done(struct fw_priv *fw_priv)
|
|
{
|
|
__fw_state_set(fw_priv, FW_STATUS_DONE);
|
|
}
|
|
|
|
int assign_fw(struct firmware *fw, struct device *device,
|
|
enum fw_opt opt_flags);
|
|
|
|
#ifdef CONFIG_FW_LOADER_PAGED_BUF
|
|
void fw_free_paged_buf(struct fw_priv *fw_priv);
|
|
int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed);
|
|
int fw_map_paged_buf(struct fw_priv *fw_priv);
|
|
#else
|
|
static inline void fw_free_paged_buf(struct fw_priv *fw_priv) {}
|
|
static inline int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed) { return -ENXIO; }
|
|
static inline int fw_map_paged_buf(struct fw_priv *fw_priv) { return -ENXIO; }
|
|
#endif
|
|
|
|
#endif /* __FIRMWARE_LOADER_H */
|