Message-ID: <7f9e2513-936d-a774-2d87-c863c523ff46@redhat.com>
Date:   Mon, 26 Oct 2020 07:23:37 -0700
From:   Tom Rix <trix@...hat.com>
To:     "Wu, Hao" <hao.wu@...el.com>,
        "Weight, Russell H" <russell.h.weight@...el.com>,
        "mdf@...nel.org" <mdf@...nel.org>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "lgoncalv@...hat.com" <lgoncalv@...hat.com>,
        "Xu, Yilun" <yilun.xu@...el.com>,
        "Gerlach, Matthew" <matthew.gerlach@...el.com>
Subject: Re: [PATCH v5 1/7] fpga: sec-mgr: intel fpga security manager class
 driver


On 10/25/20 7:29 PM, Wu, Hao wrote:
>> Subject: [PATCH v5 1/7] fpga: sec-mgr: intel fpga security manager class
>> driver
>>
>> Create the FPGA Security Manager class driver. The security
>> manager provides interfaces to manage secure updates for the
>> FPGA and BMC images that are stored in FLASH. The driver can
>> also be used to update root entry hashes and to cancel code
>> signing keys.
>>
>> This patch creates the class driver and provides sysfs
>> interfaces for displaying root entry hashes, canceled code
>> signing keys and flash counts.
>>
>> Signed-off-by: Russ Weight <russell.h.weight@...el.com>
>> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
>> Reviewed-by: Tom Rix <trix@...hat.com>
>> ---
>> v5:
>>   - Added the devm_fpga_sec_mgr_unregister() function, following recent
>>     changes to the fpga_manager() implementation.
>>   - Changed some *_show() functions to use sysfs_emit() instead of sprintf(
>> v4:
>>   - Changed from "Intel FPGA Security Manager" to FPGA Security Manager"
>>     and removed unnecessary references to "Intel".
>>   - Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_
>> v3:
>>   - Modified sysfs handler check in check_sysfs_handler() to make
>>     it more readable.
>> v2:
>>   - Bumped documentation dates and versions
>>   - Added Documentation/fpga/ifpga-sec-mgr.rst
>>   - Removed references to bmc_flash_count & smbus_flash_count (not
>> supported)
>>   - Split ifpga_sec_mgr_register() into create() and register() functions
>>   - Added devm_ifpga_sec_mgr_create()
>>   - Removed typedefs for imgr ops
>> ---
>>  .../ABI/testing/sysfs-class-fpga-sec-mgr      |  67 +++
>>  Documentation/fpga/fpga-sec-mgr.rst           |  50 ++
>>  Documentation/fpga/index.rst                  |   1 +
>>  MAINTAINERS                                   |   9 +
>>  drivers/fpga/Kconfig                          |   9 +
>>  drivers/fpga/Makefile                         |   3 +
>>  drivers/fpga/fpga-sec-mgr.c                   | 487 ++++++++++++++++++
>>  include/linux/fpga/fpga-sec-mgr.h             |  83 +++
>>  8 files changed, 709 insertions(+)
>>  create mode 100644 Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
>>  create mode 100644 Documentation/fpga/fpga-sec-mgr.rst
>>  create mode 100644 drivers/fpga/fpga-sec-mgr.c
>>  create mode 100644 include/linux/fpga/fpga-sec-mgr.h
>>
>> diff --git a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
>> b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
>> new file mode 100644
>> index 000000000000..843f0b58f171
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
>> @@ -0,0 +1,67 @@
>> +What: 		/sys/class/fpga_sec_mgr/fpga_secX/name
>> +Date:		Oct 2020
>> +KernelVersion:  5.11
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Name of low level fpga security manager driver.
>> +
>> +What:
>> 	/sys/class/fpga_sec_mgr/fpga_secX/security/sr_root_entry_hash
>> +Date:		Oct 2020
>> +KernelVersion:  5.11
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Read only. Returns the root entry hash for the static
>> +		region if one is programmed, else it returns the
>> +		string: "hash not programmed".  This file is only
>> +		visible if the underlying device supports it.
>> +		Format: "0x%x".
>> +
> If we plan to make this class driver a common one for everybody, then
> these sysfs defined here sounds a little device-specific? This is just my
> personal feeling, Moritz and Tom, how do you guys think about these ones?
>
> Hao

I agree, while other vendors may have a secure update mechanism, it is unlikely they will have _this_ one.

Do you think changing fpga_secX to intel_secX would be ok ?

Tom

>> +What:
>> 	/sys/class/fpga_sec_mgr/fpga_secX/security/pr_root_entry_hash
>> +Date:		Oct 2020
>> +KernelVersion:  5.11
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Read only. Returns the root entry hash for the partial
>> +		reconfiguration region if one is programmed, else it
>> +		returns the string: "hash not programmed".  This file
>> +		is only visible if the underlying device supports it.
>> +		Format: "0x%x".
>> +
>> +What:
>> 	/sys/class/fpga_sec_mgr/fpga_secX/security/bmc_root_entry_hash
>> +Date:		Oct 2020
>> +KernelVersion:  5.11
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Read only. Returns the root entry hash for the BMC image
>> +		if one is programmed, else it returns the string:
>> +		"hash not programmed".  This file is only visible if the
>> +		underlying device supports it.
>> +		Format: "0x%x".
>> +
>> +What:
>> 	/sys/class/fpga_sec_mgr/fpga_secX/security/sr_canceled_csks
>> +Date:		Oct 2020
>> +KernelVersion:  5.11
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Read only. Returns a list of indices for canceled code
>> +		signing keys for the static region. The standard bitmap
>> +		list format is used (e.g. "1,2-6,9").
>> +
>> +What:
>> 	/sys/class/fpga_sec_mgr/fpga_secX/security/pr_canceled_csks
>> +Date:		Oct 2020
>> +KernelVersion:  5.11
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Read only. Returns a list of indices for canceled code
>> +		signing keys for the partial reconfiguration region. The
>> +		standard bitmap list format is used (e.g. "1,2-6,9").
>> +
>> +What:
>> 	/sys/class/fpga_sec_mgr/fpga_secX/security/bmc_canceled_csks
>> +Date:		Oct 2020
>> +KernelVersion:  5.11
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Read only. Returns a list of indices for canceled code
>> +		signing keys for the BMC.  The standard bitmap list format
>> +		is used (e.g. "1,2-6,9").
>> +
>> +What:
>> 	/sys/class/fpga_sec_mgr/fpga_secX/security/user_flash_count
>> +Date:		Oct 2020
>> +KernelVersion:  5.11
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Read only. Returns number of times the user image for the
>> +		static region has been flashed.
>> +		Format: "%u".
>> diff --git a/Documentation/fpga/fpga-sec-mgr.rst
>> b/Documentation/fpga/fpga-sec-mgr.rst
>> new file mode 100644
>> index 000000000000..4a1d6519b1d3
>> --- /dev/null
>> +++ b/Documentation/fpga/fpga-sec-mgr.rst
>> @@ -0,0 +1,50 @@
>> +.. SPDX-License-Identifier: GPL-2.0
>> +
>> +========================================
>> +FPGA Security Manager Class Driver
>> +========================================
>> +
>> +The FPGA Security Manager class driver provides a common
>> +API for user-space tools to manage updates for secure FPGA
>> +devices. Device drivers that instantiate the Security
>> +Manager class driver will interact with a HW secure update
>> +engine in order to transfer new FPGA and BMC images to FLASH so
>> +that they will be automatically loaded when the FPGA card reboots.
>> +
>> +A significant difference between the FPGA Manager and the FPGA
>> +Security Manager is that the FPGA Manager does a live update (Partial
>> +Reconfiguration) to a device, whereas the FPGA Security Manager
>> +updates the FLASH images for the Static Region and the BMC so that
>> +they will be loaded the next time the FPGA card boots. Security is
>> +enforced by hardware and firmware. The security manager interacts
>> +with the firmware to initiate an update, pass in the necessary data,
>> +and collect status on the update.
>> +
>> +In addition to managing secure updates of the FPGA and BMC images,
>> +the FPGA Security Manager update process may also used to
>> +program root entry hashes and cancellation keys for the FPGA static
>> +region, the FPGA partial reconfiguration region, and the BMC.
>> +
>> +Secure updates make use of the request_firmware framework, which
>> +requires that image files are accessible under /lib/firmware. A request
>> +for a secure update returns immediately, while the update itself
>> +proceeds in the context of a kernel worker thread. Sysfs files provide
>> +a means for monitoring the progress of a secure update and for
>> +retrieving error information in the event of a failure.
>> +
>> +Sysfs Attributes
>> +================
>> +
>> +The API consists of two groups of sysfs attributes as described below.
>> +
>> +1. Files in the *security* sub-directory can be used to read security
>> +   information including: Root Entry Hashes (REH), Cancelled Code
>> +   Signing Keys (CSK), and the flash update count for FPGA images.
>> +
>> +2. Files in the *update* sub-directory can be used to instantiate and
>> +   monitor a secure update.
>> +
>> +
>> +See `<../ABI/testing/sysfs-class-fpga-sec-mgr>`__ for a full
>> +description of the sysfs attributes for the FPGA Security
>> +Manager.
>> diff --git a/Documentation/fpga/index.rst b/Documentation/fpga/index.rst
>> index f80f95667ca2..0b2f427042af 100644
>> --- a/Documentation/fpga/index.rst
>> +++ b/Documentation/fpga/index.rst
>> @@ -8,6 +8,7 @@ fpga
>>      :maxdepth: 1
>>
>>      dfl
>> +    fpga-sec-mgr
>>
>>  .. only::  subproject and html
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 4538378de6f5..7997fff716a8 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -6901,6 +6901,15 @@ F:	Documentation/fpga/
>>  F:	drivers/fpga/
>>  F:	include/linux/fpga/
>>
>> +FPGA SECURITY MANAGER DRIVERS
>> +M:	Russ Weight <russell.h.weight@...el.com>
>> +L:	linux-fpga@...r.kernel.org
>> +S:	Maintained
>> +F:	Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
>> +F:	Documentation/fpga/fpga-sec-mgr.rst
>> +F:	drivers/fpga/fpga-sec-mgr.c
>> +F:	include/linux/fpga/fpga-sec-mgr.h
>> +
>>  FPU EMULATOR
>>  M:	Bill Metzenthen <billm@...bpc.org.au>
>>  S:	Maintained
>> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
>> index 7cd5a29fc437..6810b23b178d 100644
>> --- a/drivers/fpga/Kconfig
>> +++ b/drivers/fpga/Kconfig
>> @@ -215,4 +215,13 @@ config FPGA_MGR_ZYNQMP_FPGA
>>  	  to configure the programmable logic(PL) through PS
>>  	  on ZynqMP SoC.
>>
>> +config FPGA_SEC_MGR
>> +	tristate "FPGA Security Manager"
>> +	help
>> +	  The Security Manager class driver presents a common
>> +	  user API for managing secure updates for FPGA
>> +	  devices, including flash images for the FPGA static
>> +	  region and for the BMC. Select this option to enable
>> +	  updates for secure FPGA devices.
>> +
>>  endif # FPGA
>> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
>> index d8e21dfc6778..0e357262faed 100644
>> --- a/drivers/fpga/Makefile
>> +++ b/drivers/fpga/Makefile
>> @@ -21,6 +21,9 @@ obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA)	+=
>> zynqmp-fpga.o
>>  obj-$(CONFIG_ALTERA_PR_IP_CORE)         += altera-pr-ip-core.o
>>  obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT)    += altera-pr-ip-core-plat.o
>>
>> +# FPGA Security Manager Framework
>> +obj-$(CONFIG_FPGA_SEC_MGR)		+= fpga-sec-mgr.o
>> +
>>  # FPGA Bridge Drivers
>>  obj-$(CONFIG_FPGA_BRIDGE)		+= fpga-bridge.o
>>  obj-$(CONFIG_SOCFPGA_FPGA_BRIDGE)	+= altera-hps2fpga.o altera-
>> fpga2sdram.o
>> diff --git a/drivers/fpga/fpga-sec-mgr.c b/drivers/fpga/fpga-sec-mgr.c
>> new file mode 100644
>> index 000000000000..95b5a7ccbe44
>> --- /dev/null
>> +++ b/drivers/fpga/fpga-sec-mgr.c
>> @@ -0,0 +1,487 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * FPGA Security Manager
>> + *
>> + * Copyright (C) 2019-2020 Intel Corporation, Inc.
>> + */
>> +
>> +#include <linux/fpga/fpga-sec-mgr.h>
>> +#include <linux/idr.h>
>> +#include <linux/module.h>
>> +#include <linux/slab.h>
>> +#include <linux/vmalloc.h>
>> +
>> +static DEFINE_IDA(fpga_sec_mgr_ida);
>> +static struct class *fpga_sec_mgr_class;
>> +
>> +struct fpga_sec_mgr_devres {
>> +	struct fpga_sec_mgr *smgr;
>> +};
>> +
>> +#define to_sec_mgr(d) container_of(d, struct fpga_sec_mgr, dev)
>> +
>> +static ssize_t
>> +show_canceled_csk(struct fpga_sec_mgr *smgr,
>> +		  int (*get_csk)(struct fpga_sec_mgr *smgr,
>> +				 unsigned long *csk_map, unsigned int nbits),
>> +		  int (*get_csk_nbits)(struct fpga_sec_mgr *smgr),
>> +		  char *buf)
>> +{
>> +	unsigned long *csk_map = NULL;
>> +	unsigned int nbits;
>> +	int ret;
>> +
>> +	ret = get_csk_nbits(smgr);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	nbits = (unsigned int)ret;
>> +	csk_map = vmalloc(sizeof(unsigned long) * BITS_TO_LONGS(nbits));
>> +	if (!csk_map)
>> +		return -ENOMEM;
>> +
>> +	ret = get_csk(smgr, csk_map, nbits);
>> +	if (ret)
>> +		goto vfree_exit;
>> +
>> +	ret = bitmap_print_to_pagebuf(1, buf, csk_map, nbits);
>> +
>> +vfree_exit:
>> +	vfree(csk_map);
>> +	return ret;
>> +}
>> +
>> +static ssize_t
>> +show_root_entry_hash(struct fpga_sec_mgr *smgr,
>> +		     int (*get_reh)(struct fpga_sec_mgr *smgr, u8 *hash,
>> +				    unsigned int size),
>> +		     int (*get_reh_size)(struct fpga_sec_mgr *smgr),
>> +		     char *buf)
>> +{
>> +	int size, i, cnt, ret;
>> +	u8 *hash;
>> +
>> +	ret = get_reh_size(smgr);
>> +	if (ret < 0)
>> +		return ret;
>> +	else if (!ret)
>> +		return sysfs_emit(buf, "hash not programmed\n");
>> +
>> +	size = ret;
>> +	hash = vmalloc(size);
>> +	if (!hash)
>> +		return -ENOMEM;
>> +
>> +	ret = get_reh(smgr, hash, size);
>> +	if (ret)
>> +		goto vfree_exit;
>> +
>> +	cnt = sprintf(buf, "0x");
>> +	for (i = 0; i < size; i++)
>> +		cnt += sprintf(buf + cnt, "%02x", hash[i]);
>> +	cnt += sprintf(buf + cnt, "\n");
>> +
>> +vfree_exit:
>> +	vfree(hash);
>> +	return ret ? : cnt;
>> +}
>> +
>> +#define DEVICE_ATTR_SEC_CSK(_name) \
>> +static ssize_t _name##_canceled_csks_show(struct device *dev, \
>> +					  struct device_attribute *attr, \
>> +					  char *buf) \
>> +{ \
>> +	struct fpga_sec_mgr *smgr = to_sec_mgr(dev); \
>> +	return show_canceled_csk(smgr, \
>> +	       smgr->sops->_name##_canceled_csks, \
>> +	       smgr->sops->_name##_canceled_csk_nbits, buf); \
>> +} \
>> +static DEVICE_ATTR_RO(_name##_canceled_csks)
>> +
>> +#define DEVICE_ATTR_SEC_ROOT_ENTRY_HASH(_name) \
>> +static ssize_t _name##_root_entry_hash_show(struct device *dev, \
>> +				     struct device_attribute *attr, \
>> +				     char *buf) \
>> +{ \
>> +	struct fpga_sec_mgr *smgr = to_sec_mgr(dev); \
>> +	return show_root_entry_hash(smgr, \
>> +	       smgr->sops->_name##_root_entry_hash, \
>> +	       smgr->sops->_name##_reh_size, buf); \
>> +} \
>> +static DEVICE_ATTR_RO(_name##_root_entry_hash)
>> +
>> +static ssize_t user_flash_count_show(struct device *dev,
>> +				     struct device_attribute *attr, char *buf)
>> +{
>> +	struct fpga_sec_mgr *smgr = to_sec_mgr(dev);
>> +	int cnt = smgr->sops->user_flash_count(smgr);
>> +
>> +	return cnt < 0 ? cnt : sysfs_emit(buf, "%u\n", cnt);
>> +}
>> +static DEVICE_ATTR_RO(user_flash_count);
>> +
>> +DEVICE_ATTR_SEC_ROOT_ENTRY_HASH(sr);
>> +DEVICE_ATTR_SEC_ROOT_ENTRY_HASH(pr);
>> +DEVICE_ATTR_SEC_ROOT_ENTRY_HASH(bmc);
>> +DEVICE_ATTR_SEC_CSK(sr);
>> +DEVICE_ATTR_SEC_CSK(pr);
>> +DEVICE_ATTR_SEC_CSK(bmc);
>> +
>> +static struct attribute *sec_mgr_security_attrs[] = {
>> +	&dev_attr_user_flash_count.attr,
>> +	&dev_attr_bmc_root_entry_hash.attr,
>> +	&dev_attr_sr_root_entry_hash.attr,
>> +	&dev_attr_pr_root_entry_hash.attr,
>> +	&dev_attr_sr_canceled_csks.attr,
>> +	&dev_attr_pr_canceled_csks.attr,
>> +	&dev_attr_bmc_canceled_csks.attr,
>> +	NULL,
>> +};
>> +
>> +#define check_attr(attribute, _name) \
>> +	((attribute) == &dev_attr_##_name.attr && smgr->sops->_name)
>> +
>> +static umode_t sec_mgr_visible(struct kobject *kobj,
>> +			       struct attribute *attr, int n)
>> +{
>> +	struct fpga_sec_mgr *smgr = to_sec_mgr(kobj_to_dev(kobj));
>> +
>> +	/*
>> +	 * Only display optional sysfs attributes if a
>> +	 * corresponding handler is provided
>> +	 */
>> +	if (check_attr(attr, user_flash_count) ||
>> +	    check_attr(attr, bmc_root_entry_hash) ||
>> +	    check_attr(attr, sr_root_entry_hash) ||
>> +	    check_attr(attr, pr_root_entry_hash) ||
>> +	    check_attr(attr, sr_canceled_csks) ||
>> +	    check_attr(attr, pr_canceled_csks) ||
>> +	    check_attr(attr, bmc_canceled_csks))
>> +		return attr->mode;
>> +
>> +	return 0;
>> +}
>> +
>> +static struct attribute_group sec_mgr_security_attr_group = {
>> +	.name = "security",
>> +	.attrs = sec_mgr_security_attrs,
>> +	.is_visible = sec_mgr_visible,
>> +};
>> +
>> +static ssize_t name_show(struct device *dev,
>> +			 struct device_attribute *attr, char *buf)
>> +{
>> +	struct fpga_sec_mgr *smgr = to_sec_mgr(dev);
>> +
>> +	return sysfs_emit(buf, "%s\n", smgr->name);
>> +}
>> +static DEVICE_ATTR_RO(name);
>> +
>> +static struct attribute *sec_mgr_attrs[] = {
>> +	&dev_attr_name.attr,
>> +	NULL,
>> +};
>> +
>> +static struct attribute_group sec_mgr_attr_group = {
>> +	.attrs = sec_mgr_attrs,
>> +};
>> +
>> +static const struct attribute_group *fpga_sec_mgr_attr_groups[] = {
>> +	&sec_mgr_attr_group,
>> +	&sec_mgr_security_attr_group,
>> +	NULL,
>> +};
>> +
>> +static bool check_sysfs_handler(struct device *dev,
>> +				void *sysfs_handler, void *size_handler,
>> +				const char *sysfs_handler_name,
>> +				const char *size_handler_name)
>> +{
>> +	/*
>> +	 * sysfs_handler and size_handler must either both be
>> +	 * defined or both be NULL.
>> +	 */
>> +	if (sysfs_handler && !size_handler) {
>> +		dev_err(dev, "%s registered without %s\n",
>> +			sysfs_handler_name, size_handler_name);
>> +		return false;
>> +	} else if (!sysfs_handler && size_handler) {
>> +		dev_err(dev, "%s registered without %s\n",
>> +			size_handler_name, sysfs_handler_name);
>> +		return false;
>> +	}
>> +	return true;
>> +}
>> +
>> +#define check_reh_handler(_dev, _sops, _name) \
>> +	check_sysfs_handler(_dev, (_sops)->_name##_root_entry_hash, \
>> +			    (_sops)->_name##_reh_size, \
>> +			    __stringify(_name##_root_entry_hash), \
>> +			    __stringify(_name##_reh_size))
>> +
>> +#define check_csk_handler(_dev, _sops, _name) \
>> +	check_sysfs_handler(_dev, (_sops)->_name##_canceled_csks, \
>> +			    (_sops)->_name##_canceled_csk_nbits, \
>> +			    __stringify(_name##_canceled_csks), \
>> +			    __stringify(_name##_canceled_csk_nbits))
>> +
>> +/**
>> + * fpga_sec_mgr_create - create and initialize an FPGA
>> + *			  security manager struct
>> + *
>> + * @dev:  fpga security manager device from pdev
>> + * @name: fpga security manager name
>> + * @sops: pointer to a structure of fpga callback functions
>> + * @priv: fpga security manager private data
>> + *
>> + * The caller of this function is responsible for freeing the struct
>> + * with ifpg_sec_mgr_free(). Using devm_fpga_sec_mgr_create() instead
>> + * is recommended.
>> + *
>> + * Return: pointer to struct fpga_sec_mgr or NULL
>> + */
>> +struct fpga_sec_mgr *
>> +fpga_sec_mgr_create(struct device *dev, const char *name,
>> +		    const struct fpga_sec_mgr_ops *sops, void *priv)
>> +{
>> +	struct fpga_sec_mgr *smgr;
>> +	int id, ret;
>> +
>> +	if (!check_reh_handler(dev, sops, bmc) ||
>> +	    !check_reh_handler(dev, sops, sr) ||
>> +	    !check_reh_handler(dev, sops, pr) ||
>> +	    !check_csk_handler(dev, sops, bmc) ||
>> +	    !check_csk_handler(dev, sops, sr) ||
>> +	    !check_csk_handler(dev, sops, pr)) {
>> +		return NULL;
>> +	}
>> +
>> +	if (!name || !strlen(name)) {
>> +		dev_err(dev, "Attempt to register with no name!\n");
>> +		return NULL;
>> +	}
>> +
>> +	smgr = kzalloc(sizeof(*smgr), GFP_KERNEL);
>> +	if (!smgr)
>> +		return NULL;
>> +
>> +	id = ida_simple_get(&fpga_sec_mgr_ida, 0, 0, GFP_KERNEL);
>> +	if (id < 0)
>> +		goto error_kfree;
>> +
>> +	mutex_init(&smgr->lock);
>> +
>> +	smgr->name = name;
>> +	smgr->priv = priv;
>> +	smgr->sops = sops;
>> +
>> +	device_initialize(&smgr->dev);
>> +	smgr->dev.class = fpga_sec_mgr_class;
>> +	smgr->dev.parent = dev;
>> +	smgr->dev.id = id;
>> +
>> +	ret = dev_set_name(&smgr->dev, "fpga_sec%d", id);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to set device name: fpga_sec%d\n", id);
>> +		goto error_device;
>> +	}
>> +
>> +	return smgr;
>> +
>> +error_device:
>> +	ida_simple_remove(&fpga_sec_mgr_ida, id);
>> +
>> +error_kfree:
>> +	kfree(smgr);
>> +
>> +	return NULL;
>> +}
>> +EXPORT_SYMBOL_GPL(fpga_sec_mgr_create);
>> +
>> +/**
>> + * fpga_sec_mgr_free - free an FPGA security manager created
>> + *			with fpga_sec_mgr_create()
>> + *
>> + * @smgr:	FPGA security manager structure
>> + */
>> +void fpga_sec_mgr_free(struct fpga_sec_mgr *smgr)
>> +{
>> +	ida_simple_remove(&fpga_sec_mgr_ida, smgr->dev.id);
>> +	kfree(smgr);
>> +}
>> +EXPORT_SYMBOL_GPL(fpga_sec_mgr_free);
>> +
>> +static void devm_fpga_sec_mgr_release(struct device *dev, void *res)
>> +{
>> +	struct fpga_sec_mgr_devres *dr = res;
>> +
>> +	fpga_sec_mgr_free(dr->smgr);
>> +}
>> +
>> +/**
>> + * devm_fpga_sec_mgr_create - create and initialize an FPGA
>> + *			       security manager struct
>> + *
>> + * @dev:  fpga security manager device from pdev
>> + * @name: fpga security manager name
>> + * @sops: pointer to a structure of fpga callback functions
>> + * @priv: fpga security manager private data
>> + *
>> + * This function is intended for use in a FPGA Security manager
>> + * driver's probe function.  After the security manager driver creates
>> + * the fpga_sec_mgr struct with devm_fpga_sec_mgr_create(), it should
>> + * register it with devm_fpga_sec_mgr_register().
>> + * The fpga_sec_mgr struct allocated with this function will be freed
>> + * automatically on driver detach.
>> + *
>> + * Return: pointer to struct fpga_sec_mgr or NULL
>> + */
>> +struct fpga_sec_mgr *
>> +devm_fpga_sec_mgr_create(struct device *dev, const char *name,
>> +			 const struct fpga_sec_mgr_ops *sops, void *priv)
>> +{
>> +	struct fpga_sec_mgr_devres *dr;
>> +
>> +	dr = devres_alloc(devm_fpga_sec_mgr_release, sizeof(*dr),
>> GFP_KERNEL);
>> +	if (!dr)
>> +		return NULL;
>> +
>> +	dr->smgr = fpga_sec_mgr_create(dev, name, sops, priv);
>> +	if (!dr->smgr) {
>> +		devres_free(dr);
>> +		return NULL;
>> +	}
>> +
>> +	devres_add(dev, dr);
>> +
>> +	return dr->smgr;
>> +}
>> +EXPORT_SYMBOL_GPL(devm_fpga_sec_mgr_create);
>> +
>> +/**
>> + * fpga_sec_mgr_register - register an FPGA security manager
>> + *
>> + * @smgr: fpga security manager struct
>> + *
>> + * Return: 0 on success, negative error code otherwise.
>> + */
>> +int fpga_sec_mgr_register(struct fpga_sec_mgr *smgr)
>> +{
>> +	int ret;
>> +
>> +	ret = device_add(&smgr->dev);
>> +	if (ret)
>> +		goto error_device;
>> +
>> +	dev_info(&smgr->dev, "%s registered\n", smgr->name);
>> +
>> +	return 0;
>> +
>> +error_device:
>> +	ida_simple_remove(&fpga_sec_mgr_ida, smgr->dev.id);
>> +
>> +	return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(fpga_sec_mgr_register);
>> +
>> +/**
>> + * fpga_sec_mgr_unregister - unregister an FPGA security manager
>> + *
>> + * @mgr: fpga manager struct
>> + *
>> + * This function is intended for use in an FPGA security manager
>> + * driver's remove() function.
>> + */
>> +void fpga_sec_mgr_unregister(struct fpga_sec_mgr *smgr)
>> +{
>> +	dev_info(&smgr->dev, "%s %s\n", __func__, smgr->name);
>> +
>> +	device_unregister(&smgr->dev);
>> +}
>> +EXPORT_SYMBOL_GPL(fpga_sec_mgr_unregister);
>> +
>> +static int fpga_sec_mgr_devres_match(struct device *dev, void *res,
>> +				     void *match_data)
>> +{
>> +	struct fpga_sec_mgr_devres *dr = res;
>> +
>> +	return match_data == dr->smgr;
>> +}
>> +
>> +static void devm_fpga_sec_mgr_unregister(struct device *dev, void *res)
>> +{
>> +	struct fpga_sec_mgr_devres *dr = res;
>> +
>> +	fpga_sec_mgr_unregister(dr->smgr);
>> +}
>> +
>> +/**
>> + * devm_fpga_sec_mgr_register - resource managed variant of
>> + *				fpga_sec_mgr_register()
>> + *
>> + * @dev: managing device for this FPGA security manager
>> + * @smgr: fpga security manager struct
>> + *
>> + * This is the devres variant of fpga_sec_mgr_register() for which the
>> + * unregister function will be called automatically when the managing
>> + * device is detached.
>> + */
>> +int devm_fpga_sec_mgr_register(struct device *dev, struct fpga_sec_mgr
>> *smgr)
>> +{
>> +	struct fpga_sec_mgr_devres *dr;
>> +	int ret;
>> +
>> +	/*
>> +	 * Make sure that the struct fpga_sec_mgr * that is passed in is
>> +	 * managed itself.
>> +	 */
>> +	if (WARN_ON(!devres_find(dev, devm_fpga_sec_mgr_release,
>> +				 fpga_sec_mgr_devres_match, smgr)))
>> +		return -EINVAL;
>> +
>> +	dr = devres_alloc(devm_fpga_sec_mgr_unregister, sizeof(*dr),
>> GFP_KERNEL);
>> +	if (!dr)
>> +		return -ENOMEM;
>> +
>> +	ret = fpga_sec_mgr_register(smgr);
>> +	if (ret) {
>> +		devres_free(dr);
>> +		return ret;
>> +	}
>> +
>> +	dr->smgr = smgr;
>> +	devres_add(dev, dr);
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devm_fpga_sec_mgr_register);
>> +
>> +static void fpga_sec_mgr_dev_release(struct device *dev)
>> +{
>> +}
>> +
>> +static int __init fpga_sec_mgr_class_init(void)
>> +{
>> +	pr_info("FPGA Security Manager\n");
>> +
>> +	fpga_sec_mgr_class = class_create(THIS_MODULE, "fpga_sec_mgr");
>> +	if (IS_ERR(fpga_sec_mgr_class))
>> +		return PTR_ERR(fpga_sec_mgr_class);
>> +
>> +	fpga_sec_mgr_class->dev_groups = fpga_sec_mgr_attr_groups;
>> +	fpga_sec_mgr_class->dev_release = fpga_sec_mgr_dev_release;
>> +
>> +	return 0;
>> +}
>> +
>> +static void __exit fpga_sec_mgr_class_exit(void)
>> +{
>> +	class_destroy(fpga_sec_mgr_class);
>> +	ida_destroy(&fpga_sec_mgr_ida);
>> +}
>> +
>> +MODULE_DESCRIPTION("FPGA Security Manager Driver");
>> +MODULE_LICENSE("GPL v2");
>> +
>> +subsys_initcall(fpga_sec_mgr_class_init);
>> +module_exit(fpga_sec_mgr_class_exit)
>> diff --git a/include/linux/fpga/fpga-sec-mgr.h b/include/linux/fpga/fpga-sec-
>> mgr.h
>> new file mode 100644
>> index 000000000000..dd596c6c3748
>> --- /dev/null
>> +++ b/include/linux/fpga/fpga-sec-mgr.h
>> @@ -0,0 +1,83 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Header file for FPGA Security Manager
>> + *
>> + * Copyright (C) 2019-2020 Intel Corporation, Inc.
>> + */
>> +#ifndef _LINUX_FPGA_SEC_MGR_H
>> +#define _LINUX_FPGA_SEC_MGR_H
>> +
>> +#include <linux/device.h>
>> +#include <linux/mutex.h>
>> +#include <linux/types.h>
>> +
>> +struct fpga_sec_mgr;
>> +
>> +/**
>> + * struct fpga_sec_mgr_ops - device specific operations
>> + * @user_flash_count:	    Optional: Return sysfs string output for
>> FPGA
>> + *			    image flash count
>> + * @sr_root_entry_hash:	    Optional: Return sysfs string output for
>> static
>> + *			    region root entry hash
>> + * @pr_root_entry_hash:	    Optional: Return sysfs string output for
>> partial
>> + *			    reconfiguration root entry hash
>> + * @bmc_root_entry_hash:    Optional: Return sysfs string output for BMC
>> + *			    root entry hash
>> + * @sr_canceled_csks:	    Optional: Return sysfs string output for static
>> + *			    region canceled keys
>> + * @pr_canceled_csks:	    Optional: Return sysfs string output for
>> partial
>> + *			    reconfiguration canceled keys
>> + * @bmc_canceled_csks:	    Optional: Return sysfs string output for
>> bmc
>> + *			    canceled keys
>> + * @bmc_canceled_csk_nbits: Optional: Return BMC canceled csk vector bit
>> count
>> + * @sr_canceled_csk_nbits:  Optional: Return SR canceled csk vector bit
>> count
>> + * @pr_canceled_csk_nbits:  Optional: Return PR canceled csk vector bit
>> count
>> + * @bmc_reh_size:	    Optional: Return byte size for BMC root entry hash
>> + * @sr_reh_size:	    Optional: Return byte size for SR root entry hash
>> + * @pr_reh_size:	    Optional: Return byte size for PR root entry hash
>> + */
>> +struct fpga_sec_mgr_ops {
>> +	int (*user_flash_count)(struct fpga_sec_mgr *smgr);
>> +	int (*bmc_root_entry_hash)(struct fpga_sec_mgr *smgr, u8 *hash,
>> +				   unsigned int size);
>> +	int (*sr_root_entry_hash)(struct fpga_sec_mgr *smgr, u8 *hash,
>> +				  unsigned int size);
>> +	int (*pr_root_entry_hash)(struct fpga_sec_mgr *smgr, u8 *hash,
>> +				  unsigned int size);
>> +	int (*bmc_canceled_csks)(struct fpga_sec_mgr *smgr,
>> +				 unsigned long *csk_map, unsigned int nbits);
>> +	int (*sr_canceled_csks)(struct fpga_sec_mgr *smgr,
>> +				unsigned long *csk_map, unsigned int nbits);
>> +	int (*pr_canceled_csks)(struct fpga_sec_mgr *smgr,
>> +				unsigned long *csk_map, unsigned int nbits);
>> +	int (*bmc_reh_size)(struct fpga_sec_mgr *smgr);
>> +	int (*sr_reh_size)(struct fpga_sec_mgr *smgr);
>> +	int (*pr_reh_size)(struct fpga_sec_mgr *smgr);
>> +	int (*bmc_canceled_csk_nbits)(struct fpga_sec_mgr *smgr);
>> +	int (*sr_canceled_csk_nbits)(struct fpga_sec_mgr *smgr);
>> +	int (*pr_canceled_csk_nbits)(struct fpga_sec_mgr *smgr);
>> +};
>> +
>> +struct fpga_sec_mgr {
>> +	const char *name;
>> +	struct device dev;
>> +	const struct fpga_sec_mgr_ops *sops;
>> +	struct mutex lock;		/* protect data structure contents */
>> +	void *priv;
>> +};
>> +
>> +struct fpga_sec_mgr *
>> +fpga_sec_mgr_create(struct device *dev, const char *name,
>> +		    const struct fpga_sec_mgr_ops *sops, void *priv);
>> +
>> +struct fpga_sec_mgr *
>> +devm_fpga_sec_mgr_create(struct device *dev, const char *name,
>> +			 const struct fpga_sec_mgr_ops *sops, void *priv);
>> +
>> +int fpga_sec_mgr_register(struct fpga_sec_mgr *smgr);
>> +int devm_fpga_sec_mgr_register(struct device *dev,
>> +			       struct fpga_sec_mgr *smgr);
>> +void fpga_sec_mgr_unregister(struct fpga_sec_mgr *smgr);
>> +void fpga_sec_mgr_free(struct fpga_sec_mgr *smgr);
>> +
>> +#endif
>> --
>> 2.25.1

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