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firmware_loader: Add firmware-upload support 

Extend the firmware subsystem to support a persistent sysfs interface that
userspace may use to initiate a firmware update. For example, FPGA based
PCIe cards load firmware and FPGA images from local FLASH when the card
boots. The images in FLASH may be updated with new images provided by the
user at his/her convenience.

A device driver may call firmware_upload_register() to expose persistent
"loading" and "data" sysfs files. These files are used in the same way as
the fallback sysfs "loading" and "data" files. When 0 is written to
"loading" to complete the write of firmware data, the data is transferred
to the lower-level driver using pre-registered call-back functions. The
data transfer is done in the context of a kernel worker thread.

Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Tianfei zhang <tianfei.zhang@intel.com>
Tested-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Link: https://lore.kernel.org/r/20220421212204.36052-5-russell.h.weight@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russ Weight 2022-04-21 14:22:00 -07:00 committed by Greg Kroah-Hartman
parent e0c11a8b98
commit 97730bbb24
12 changed files with 595 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
Documentation/ABI/testing/sysfs-class-firmware Normal file
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@ -0,0 +1,32 @@
What: /sys/class/firmware/.../data
Date: July 2022
KernelVersion: 5.19
Contact: Russ Weight <russell.h.weight@intel.com>
Description: The data sysfs file is used for firmware-fallback and for
firmware uploads. Cat a firmware image to this sysfs file
after you echo 1 to the loading sysfs file. When the firmware
image write is complete, echo 0 to the loading sysfs file. This
sequence will signal the completion of the firmware write and
signal the lower-level driver that the firmware data is
available.
What: /sys/class/firmware/.../loading
Date: July 2022
KernelVersion: 5.19
Contact: Russ Weight <russell.h.weight@intel.com>
Description: The loading sysfs file is used for both firmware-fallback and
for firmware uploads. Echo 1 onto the loading file to indicate
you are writing a firmware file to the data sysfs node. Echo
-1 onto this file to abort the data write or echo 0 onto this
file to indicate that the write is complete. For firmware
uploads, the zero value also triggers the transfer of the
firmware data to the lower-level device driver.
What: /sys/class/firmware/.../timeout
Date: July 2022
KernelVersion: 5.19
Contact: Russ Weight <russell.h.weight@intel.com>
Description: This file supports the timeout mechanism for firmware
fallback. This file has no affect on firmware uploads. For
more information on timeouts please see the documentation
for firmware fallback.

107
Documentation/driver-api/firmware/fw_upload.rst Normal file
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@ -0,0 +1,107 @@
.. SPDX-License-Identifier: GPL-2.0
===================
Firmware Upload API
===================
A device driver that registers with the firmware loader will expose
persistent sysfs nodes to enable users to initiate firmware updates for
that device. It is the responsibility of the device driver and/or the
device itself to perform any validation on the data received. Firmware
upload uses the same *loading* and *data* sysfs files described in the
documentation for firmware fallback.
Register for firmware upload
============================
A device driver registers for firmware upload by calling
firmware_upload_register(). Among the parameter list is a name to
identify the device under /sys/class/firmware. A user may initiate a
firmware upload by echoing a 1 to the *loading* sysfs file for the target
device. Next, the user writes the firmware image to the *data* sysfs
file. After writing the firmware data, the user echos 0 to the *loading*
sysfs file to signal completion. Echoing 0 to *loading* also triggers the
transfer of the firmware to the lower-lever device driver in the context
of a kernel worker thread.
To use the firmware upload API, write a driver that implements a set of
ops. The probe function calls firmware_upload_register() and the remove
function calls firmware_upload_unregister() such as::
static const struct fw_upload_ops m10bmc_ops = {
.prepare = m10bmc_sec_prepare,
.write = m10bmc_sec_write,
.poll_complete = m10bmc_sec_poll_complete,
.cancel = m10bmc_sec_cancel,
.cleanup = m10bmc_sec_cleanup,
};
static int m10bmc_sec_probe(struct platform_device *pdev)
{
const char *fw_name, *truncate;
struct m10bmc_sec *sec;
struct fw_upload *fwl;
unsigned int len;
sec = devm_kzalloc(&pdev->dev, sizeof(*sec), GFP_KERNEL);
if (!sec)
return -ENOMEM;
sec->dev = &pdev->dev;
sec->m10bmc = dev_get_drvdata(pdev->dev.parent);
dev_set_drvdata(&pdev->dev, sec);
fw_name = dev_name(sec->dev);
truncate = strstr(fw_name, ".auto");
len = (truncate) ? truncate - fw_name : strlen(fw_name);
sec->fw_name = kmemdup_nul(fw_name, len, GFP_KERNEL);
fwl = firmware_upload_register(sec->dev, sec->fw_name, &m10bmc_ops, sec);
if (IS_ERR(fwl)) {
dev_err(sec->dev, "Firmware Upload driver failed to start\n");
kfree(sec->fw_name);
return PTR_ERR(fwl);
}
sec->fwl = fwl;
return 0;
}
static int m10bmc_sec_remove(struct platform_device *pdev)
{
struct m10bmc_sec *sec = dev_get_drvdata(&pdev->dev);
firmware_upload_unregister(sec->fwl);
kfree(sec->fw_name);
return 0;
}
firmware_upload_register
------------------------
.. kernel-doc:: drivers/base/firmware_loader/sysfs_upload.c
:identifiers: firmware_upload_register
firmware_upload_unregister
--------------------------
.. kernel-doc:: drivers/base/firmware_loader/sysfs_upload.c
:identifiers: firmware_upload_unregister
Firmware Upload Ops
-------------------
.. kernel-doc:: include/linux/firmware.h
:identifiers: fw_upload_ops
Firmware Upload Progress Codes
------------------------------
The following progress codes are used internally by the firmware loader:
.. kernel-doc:: drivers/base/firmware_loader/sysfs_upload.h
:identifiers: fw_upload_prog
Firmware Upload Error Codes
---------------------------
The following error codes may be returned by the driver ops in case of
failure:
.. kernel-doc:: include/linux/firmware.h
:identifiers: fw_upload_err

1
Documentation/driver-api/firmware/index.rst
View File

@ -8,6 +8,7 @@ Linux Firmware API
core
efi/index
request_firmware
fw_upload
other_interfaces
.. only:: subproject and html

14
drivers/base/firmware_loader/Kconfig
View File

@ -202,5 +202,19 @@ config FW_CACHE
If unsure, say Y.
config FW_UPLOAD
bool "Enable users to initiate firmware updates using sysfs"
select FW_LOADER_SYSFS
select FW_LOADER_PAGED_BUF
help
Enabling this option will allow device drivers to expose a persistent
sysfs interface that allows firmware updates to be initiated from
userspace. For example, FPGA based PCIe cards load firmware and FPGA
images from local FLASH when the card boots. The images in FLASH may
be updated with new images provided by the user. Enable this device
to support cards that rely on user-initiated updates for firmware files.
If unsure, say N.
endif # FW_LOADER
endmenu

1
drivers/base/firmware_loader/Makefile
View File

@ -7,5 +7,6 @@ firmware_class-objs := main.o
firmware_class-$(CONFIG_FW_LOADER_USER_HELPER) += fallback.o
firmware_class-$(CONFIG_EFI_EMBEDDED_FIRMWARE) += fallback_platform.o
firmware_class-$(CONFIG_FW_LOADER_SYSFS) += sysfs.o
firmware_class-$(CONFIG_FW_UPLOAD) += sysfs_upload.o
obj-y += builtin/

6
drivers/base/firmware_loader/firmware.h
View File

@ -87,6 +87,7 @@ struct fw_priv {
};
extern struct mutex fw_lock;
extern struct firmware_cache fw_cache;
static inline bool __fw_state_check(struct fw_priv *fw_priv,
enum fw_status status)
@ -159,7 +160,12 @@ static inline bool fw_state_is_loading(struct fw_priv *fw_priv)
return __fw_state_check(fw_priv, FW_STATUS_LOADING);
}
int alloc_lookup_fw_priv(const char *fw_name, struct firmware_cache *fwc,
struct fw_priv **fw_priv, void *dbuf, size_t size,
size_t offset, u32 opt_flags);
int assign_fw(struct firmware *fw, struct device *device);
void free_fw_priv(struct fw_priv *fw_priv);
void fw_state_init(struct fw_priv *fw_priv);
#ifdef CONFIG_FW_LOADER
bool firmware_is_builtin(const struct firmware *fw);

16
drivers/base/firmware_loader/main.c
View File

@ -92,9 +92,9 @@ static inline struct fw_priv *to_fw_priv(struct kref *ref)
* guarding for corner cases a global lock should be OK */
DEFINE_MUTEX(fw_lock);
static struct firmware_cache fw_cache;
struct firmware_cache fw_cache;
static void fw_state_init(struct fw_priv *fw_priv)
void fw_state_init(struct fw_priv *fw_priv)
{
struct fw_state *fw_st = &fw_priv->fw_st;
@ -164,13 +164,9 @@ static struct fw_priv *__lookup_fw_priv(const char *fw_name)
}
/* Returns 1 for batching firmware requests with the same name */
static int alloc_lookup_fw_priv(const char *fw_name,
struct firmware_cache *fwc,
struct fw_priv **fw_priv,
void *dbuf,
size_t size,
size_t offset,
u32 opt_flags)
int alloc_lookup_fw_priv(const char *fw_name, struct firmware_cache *fwc,
struct fw_priv **fw_priv, void *dbuf, size_t size,
size_t offset, u32 opt_flags)
{
struct fw_priv *tmp;
@ -225,7 +221,7 @@ static void __free_fw_priv(struct kref *ref)
kfree(fw_priv);
}
static void free_fw_priv(struct fw_priv *fw_priv)
void free_fw_priv(struct fw_priv *fw_priv)
{
struct firmware_cache *fwc = fw_priv->fwc;
spin_lock(&fwc->lock);

19
drivers/base/firmware_loader/sysfs.c
View File

@ -6,8 +6,8 @@
#include <linux/slab.h>
#include <linux/types.h>
#include "firmware.h"
#include "sysfs.h"
#include "sysfs_upload.h"
/*
* sysfs support for firmware loader
@ -94,6 +94,10 @@ static void fw_dev_release(struct device *dev)
{
struct fw_sysfs *fw_sysfs = to_fw_sysfs(dev);
if (fw_sysfs->fw_upload_priv) {
free_fw_priv(fw_sysfs->fw_priv);
kfree(fw_sysfs->fw_upload_priv);
}
kfree(fw_sysfs);
}
@ -199,6 +203,14 @@ static ssize_t firmware_loading_store(struct device *dev,
written = rc;
} else {
fw_state_done(fw_priv);
/*
* If this is a user-initiated firmware upload
* then start the upload in a worker thread now.
*/
rc = fw_upload_start(fw_sysfs);
if (rc)
written = rc;
}
break;
}
@ -208,6 +220,9 @@ static ssize_t firmware_loading_store(struct device *dev,
fallthrough;
case -1:
fw_load_abort(fw_sysfs);
if (fw_sysfs->fw_upload_priv)
fw_state_init(fw_sysfs->fw_priv);
break;
}
out:
@ -215,7 +230,7 @@ out:
return written;
}
static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);
DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);
static void firmware_rw_data(struct fw_priv *fw_priv, char *buffer,
loff_t offset, size_t count, bool read)

4
drivers/base/firmware_loader/sysfs.h
View File

@ -4,9 +4,12 @@
#include <linux/device.h>
#include "firmware.h"
MODULE_IMPORT_NS(FIRMWARE_LOADER_PRIVATE);
extern struct firmware_fallback_config fw_fallback_config;
extern struct device_attribute dev_attr_loading;
#ifdef CONFIG_FW_LOADER_USER_HELPER
/**
@ -73,6 +76,7 @@ struct fw_sysfs {
struct device dev;
struct fw_priv *fw_priv;
struct firmware *fw;
void *fw_upload_priv;
};
static inline struct fw_sysfs *to_fw_sysfs(struct device *dev)

276
drivers/base/firmware_loader/sysfs_upload.c Normal file
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@ -0,0 +1,276 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "sysfs.h"
#include "sysfs_upload.h"
/*
* Support for user-space to initiate a firmware upload to a device.
*/
static void fw_upload_update_progress(struct fw_upload_priv *fwlp,
enum fw_upload_prog new_progress)
{
mutex_lock(&fwlp->lock);
fwlp->progress = new_progress;
mutex_unlock(&fwlp->lock);
}
static void fw_upload_set_error(struct fw_upload_priv *fwlp,
enum fw_upload_err err_code)
{
mutex_lock(&fwlp->lock);
fwlp->err_progress = fwlp->progress;
fwlp->err_code = err_code;
mutex_unlock(&fwlp->lock);
}
static void fw_upload_prog_complete(struct fw_upload_priv *fwlp)
{
mutex_lock(&fwlp->lock);
fwlp->progress = FW_UPLOAD_PROG_IDLE;
mutex_unlock(&fwlp->lock);
}
static void fw_upload_main(struct work_struct *work)
{
struct fw_upload_priv *fwlp;
struct fw_sysfs *fw_sysfs;
u32 written = 0, offset = 0;
enum fw_upload_err ret;
struct device *fw_dev;
struct fw_upload *fwl;
fwlp = container_of(work, struct fw_upload_priv, work);
fwl = fwlp->fw_upload;
fw_sysfs = (struct fw_sysfs *)fwl->priv;
fw_dev = &fw_sysfs->dev;
fw_upload_update_progress(fwlp, FW_UPLOAD_PROG_PREPARING);
ret = fwlp->ops->prepare(fwl, fwlp->data, fwlp->remaining_size);
if (ret != FW_UPLOAD_ERR_NONE) {
fw_upload_set_error(fwlp, ret);
goto putdev_exit;
}
fw_upload_update_progress(fwlp, FW_UPLOAD_PROG_TRANSFERRING);
while (fwlp->remaining_size) {
ret = fwlp->ops->write(fwl, fwlp->data, offset,
fwlp->remaining_size, &written);
if (ret != FW_UPLOAD_ERR_NONE || !written) {
if (ret == FW_UPLOAD_ERR_NONE) {
dev_warn(fw_dev, "write-op wrote zero data\n");
ret = FW_UPLOAD_ERR_RW_ERROR;
}
fw_upload_set_error(fwlp, ret);
goto done;
}
fwlp->remaining_size -= written;
offset += written;
}
fw_upload_update_progress(fwlp, FW_UPLOAD_PROG_PROGRAMMING);
ret = fwlp->ops->poll_complete(fwl);
if (ret != FW_UPLOAD_ERR_NONE)
fw_upload_set_error(fwlp, ret);
done:
if (fwlp->ops->cleanup)
fwlp->ops->cleanup(fwl);
putdev_exit:
put_device(fw_dev->parent);
/*
* Note: fwlp->remaining_size is left unmodified here to provide
* additional information on errors. It will be reinitialized when
* the next firmeware upload begins.
*/
mutex_lock(&fw_lock);
fw_free_paged_buf(fw_sysfs->fw_priv);
fw_state_init(fw_sysfs->fw_priv);
mutex_unlock(&fw_lock);
fwlp->data = NULL;
fw_upload_prog_complete(fwlp);
}
/*
* Start a worker thread to upload data to the parent driver.
* Must be called with fw_lock held.
*/
int fw_upload_start(struct fw_sysfs *fw_sysfs)
{
struct fw_priv *fw_priv = fw_sysfs->fw_priv;
struct device *fw_dev = &fw_sysfs->dev;
struct fw_upload_priv *fwlp;
if (!fw_sysfs->fw_upload_priv)
return 0;
if (!fw_priv->size) {
fw_free_paged_buf(fw_priv);
fw_state_init(fw_sysfs->fw_priv);
return 0;
}
fwlp = fw_sysfs->fw_upload_priv;
mutex_lock(&fwlp->lock);
/* Do not interfere with an on-going fw_upload */
if (fwlp->progress != FW_UPLOAD_PROG_IDLE) {
mutex_unlock(&fwlp->lock);
return -EBUSY;
}
get_device(fw_dev->parent); /* released in fw_upload_main */
fwlp->progress = FW_UPLOAD_PROG_RECEIVING;
fwlp->err_code = 0;
fwlp->remaining_size = fw_priv->size;
fwlp->data = fw_priv->data;
pr_debug("%s: fw-%s fw_priv=%p data=%p size=%u\n",
__func__, fw_priv->fw_name,
fw_priv, fw_priv->data,
(unsigned int)fw_priv->size);
queue_work(system_long_wq, &fwlp->work);
mutex_unlock(&fwlp->lock);
return 0;
}
/**
* firmware_upload_register() - register for the firmware upload sysfs API
* @parent: parent device instantiating firmware upload
* @name: firmware name to be associated with this device
* @ops: pointer to structure of firmware upload ops
* @dd_handle: pointer to parent driver private data
*
* @name must be unique among all users of firmware upload. The firmware
* sysfs files for this device will be found at /sys/class/firmware/@name.
*
* Return: struct fw_upload pointer or ERR_PTR()
*
**/
struct fw_upload *
firmware_upload_register(struct module *module, struct device *parent,
const char *name, const struct fw_upload_ops *ops,
void *dd_handle)
{
u32 opt_flags = FW_OPT_NOCACHE;
struct fw_upload *fw_upload;
struct fw_upload_priv *fw_upload_priv;
struct fw_sysfs *fw_sysfs;
struct fw_priv *fw_priv;
struct device *fw_dev;
int ret;
if (!name || name[0] == '\0')
return ERR_PTR(-EINVAL);
if (!ops || !ops->cancel || !ops->prepare ||
!ops->write || !ops->poll_complete) {
dev_err(parent, "Attempt to register without all required ops\n");
return ERR_PTR(-EINVAL);
}
if (!try_module_get(module))
return ERR_PTR(-EFAULT);
fw_upload = kzalloc(sizeof(*fw_upload), GFP_KERNEL);
if (!fw_upload) {
ret = -ENOMEM;
goto exit_module_put;
}
fw_upload_priv = kzalloc(sizeof(*fw_upload_priv), GFP_KERNEL);
if (!fw_upload_priv) {
ret = -ENOMEM;
goto free_fw_upload;
}
fw_upload_priv->fw_upload = fw_upload;
fw_upload_priv->ops = ops;
mutex_init(&fw_upload_priv->lock);
fw_upload_priv->module = module;
fw_upload_priv->name = name;
fw_upload_priv->err_code = 0;
fw_upload_priv->progress = FW_UPLOAD_PROG_IDLE;
INIT_WORK(&fw_upload_priv->work, fw_upload_main);
fw_upload->dd_handle = dd_handle;
fw_sysfs = fw_create_instance(NULL, name, parent, opt_flags);
if (IS_ERR(fw_sysfs)) {
ret = PTR_ERR(fw_sysfs);
goto free_fw_upload_priv;
}
fw_upload->priv = fw_sysfs;
fw_sysfs->fw_upload_priv = fw_upload_priv;
fw_dev = &fw_sysfs->dev;
ret = alloc_lookup_fw_priv(name, &fw_cache, &fw_priv, NULL, 0, 0,
FW_OPT_NOCACHE);
if (ret != 0) {
if (ret > 0)
ret = -EINVAL;
goto free_fw_sysfs;
}
fw_priv->is_paged_buf = true;
fw_sysfs->fw_priv = fw_priv;
ret = device_add(fw_dev);
if (ret) {
dev_err(fw_dev, "%s: device_register failed\n", __func__);
put_device(fw_dev);
goto exit_module_put;
}
return fw_upload;
free_fw_sysfs:
kfree(fw_sysfs);
free_fw_upload_priv:
kfree(fw_upload_priv);
free_fw_upload:
kfree(fw_upload);
exit_module_put:
module_put(module);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(firmware_upload_register);
/**
* firmware_upload_unregister() - Unregister firmware upload interface
* @fw_upload: pointer to struct fw_upload
**/
void firmware_upload_unregister(struct fw_upload *fw_upload)
{
struct fw_sysfs *fw_sysfs = fw_upload->priv;
struct fw_upload_priv *fw_upload_priv = fw_sysfs->fw_upload_priv;
mutex_lock(&fw_upload_priv->lock);
if (fw_upload_priv->progress == FW_UPLOAD_PROG_IDLE) {
mutex_unlock(&fw_upload_priv->lock);
goto unregister;
}
fw_upload_priv->ops->cancel(fw_upload);
mutex_unlock(&fw_upload_priv->lock);
/* Ensure lower-level device-driver is finished */
flush_work(&fw_upload_priv->work);
unregister:
device_unregister(&fw_sysfs->dev);
module_put(fw_upload_priv->module);
}
EXPORT_SYMBOL_GPL(firmware_upload_unregister);

49
drivers/base/firmware_loader/sysfs_upload.h Normal file
View File

@ -0,0 +1,49 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __FIRMWARE_UPLOAD_H
#define __FIRMWARE_UPLOAD_H
#include <linux/device.h>
/**
* enum fw_upload_prog - firmware upload progress codes
* @FW_UPLOAD_PROG_IDLE: there is no firmware upload in progress
* @FW_UPLOAD_PROG_RECEIVING: worker thread is receiving firmware data
* @FW_UPLOAD_PROG_PREPARING: target device is preparing for firmware upload
* @FW_UPLOAD_PROG_TRANSFERRING: data is being copied to the device
* @FW_UPLOAD_PROG_PROGRAMMING: device is performing the firmware update
* @FW_UPLOAD_PROG_MAX: Maximum progress code marker
*/
enum fw_upload_prog {
FW_UPLOAD_PROG_IDLE,
FW_UPLOAD_PROG_RECEIVING,
FW_UPLOAD_PROG_PREPARING,
FW_UPLOAD_PROG_TRANSFERRING,
FW_UPLOAD_PROG_PROGRAMMING,
FW_UPLOAD_PROG_MAX
};
struct fw_upload_priv {
struct fw_upload *fw_upload;
struct module *module;
const char *name;
const struct fw_upload_ops *ops;
struct mutex lock; /* protect data structure contents */
struct work_struct work;
const u8 *data; /* pointer to update data */
u32 remaining_size; /* size remaining to transfer */
enum fw_upload_prog progress;
enum fw_upload_prog err_progress; /* progress at time of failure */
enum fw_upload_err err_code; /* security manager error code */
};
#ifdef CONFIG_FW_UPLOAD
int fw_upload_start(struct fw_sysfs *fw_sysfs);
umode_t fw_upload_is_visible(struct kobject *kobj, struct attribute *attr, int n);
#else
static inline int fw_upload_start(struct fw_sysfs *fw_sysfs)
{
return 0;
}
#endif
#endif /* __FIRMWARE_UPLOAD_H */

82
include/linux/firmware.h
View File

@ -17,6 +17,64 @@ struct firmware {
void *priv;
};
/**
* enum fw_upload_err - firmware upload error codes
* @FW_UPLOAD_ERR_NONE: returned to indicate success
* @FW_UPLOAD_ERR_HW_ERROR: error signalled by hardware, see kernel log
* @FW_UPLOAD_ERR_TIMEOUT: SW timed out on handshake with HW/firmware
* @FW_UPLOAD_ERR_CANCELED: upload was cancelled by the user
* @FW_UPLOAD_ERR_BUSY: there is an upload operation already in progress
* @FW_UPLOAD_ERR_INVALID_SIZE: invalid firmware image size
* @FW_UPLOAD_ERR_RW_ERROR: read or write to HW failed, see kernel log
* @FW_UPLOAD_ERR_WEAROUT: FLASH device is approaching wear-out, wait & retry
* @FW_UPLOAD_ERR_MAX: Maximum error code marker
*/
enum fw_upload_err {
FW_UPLOAD_ERR_NONE,
FW_UPLOAD_ERR_HW_ERROR,
FW_UPLOAD_ERR_TIMEOUT,
FW_UPLOAD_ERR_CANCELED,
FW_UPLOAD_ERR_BUSY,
FW_UPLOAD_ERR_INVALID_SIZE,
FW_UPLOAD_ERR_RW_ERROR,
FW_UPLOAD_ERR_WEAROUT,
FW_UPLOAD_ERR_MAX
};
struct fw_upload {
void *dd_handle; /* reference to parent driver */
void *priv; /* firmware loader private fields */
};
/**
* struct fw_upload_ops - device specific operations to support firmware upload
* @prepare: Required: Prepare secure update
* @write: Required: The write() op receives the remaining
* size to be written and must return the actual
* size written or a negative error code. The write()
* op will be called repeatedly until all data is
* written.
* @poll_complete: Required: Check for the completion of the
* HW authentication/programming process.
* @cancel: Required: Request cancellation of update. This op
* is called from the context of a different kernel
* thread, so race conditions need to be considered.
* @cleanup: Optional: Complements the prepare()
* function and is called at the completion
* of the update, on success or failure, if the
* prepare function succeeded.
*/
struct fw_upload_ops {
enum fw_upload_err (*prepare)(struct fw_upload *fw_upload,
const u8 *data, u32 size);
enum fw_upload_err (*write)(struct fw_upload *fw_upload,
const u8 *data, u32 offset,
u32 size, u32 *written);
enum fw_upload_err (*poll_complete)(struct fw_upload *fw_upload);
void (*cancel)(struct fw_upload *fw_upload);
void (*cleanup)(struct fw_upload *fw_upload);
};
struct module;
struct device;
@ -112,6 +170,30 @@ static inline int request_partial_firmware_into_buf
#endif
#ifdef CONFIG_FW_UPLOAD
struct fw_upload *
firmware_upload_register(struct module *module, struct device *parent,
const char *name, const struct fw_upload_ops *ops,
void *dd_handle);
void firmware_upload_unregister(struct fw_upload *fw_upload);
#else
static inline struct fw_upload *
firmware_upload_register(struct module *module, struct device *parent,
const char *name, const struct fw_upload_ops *ops,
void *dd_handle)
{
return ERR_PTR(-EINVAL);
}
static inline void firmware_upload_unregister(struct fw_upload *fw_upload)
{
}
#endif
int firmware_request_cache(struct device *device, const char *name);
#endif