Message-ID: <58a1b51a-4c01-248f-1ee7-fc541e417b44@intel.com>
Date:   Fri, 4 Sep 2020 17:44:58 -0700
From:   Russ Weight <russell.h.weight@...el.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     lee.jones@...aro.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, trix@...hat.com, lgoncalv@...hat.com,
        yilun.xu@...el.com, hao.wu@...el.com, matthew.gerlach@...el.com
Subject: Re: [PATCH v1 01/12] fpga: fpga security manager class driver


On 9/4/20 5:23 PM, Moritz Fischer wrote:
> Hi Russ,
>
> On Fri, Sep 04, 2020 at 04:52:54PM -0700, Russ Weight wrote:
>> Create the Intel 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>
> As for Reviewed-by tags I had seen on other patches in the series, I'd
> prefer for that to happen on public mailing lists. If Hao reviewed
> patches on some internal Intel list I won't know about it, so please
> have him properly Ack/Reviewed-by tag things on a public mailing list.

Sure - I'll remove the Ack/Reviewed-by tags that were added internally 
before I submit the next version of the patchset (except where Hao 
re-adds them on the public list during this review cycle).

>
>> ---
>>   .../ABI/testing/sysfs-class-ifpga-sec-mgr     |  75 ++++
>>   MAINTAINERS                                   |   8 +
>>   drivers/fpga/Kconfig                          |   9 +
>>   drivers/fpga/Makefile                         |   3 +
>>   drivers/fpga/ifpga-sec-mgr.c                  | 339 ++++++++++++++++++
>>   include/linux/fpga/ifpga-sec-mgr.h            | 145 ++++++++
>>   6 files changed, 579 insertions(+)
>>   create mode 100644 Documentation/ABI/testing/sysfs-class-ifpga-sec-mgr
>>   create mode 100644 drivers/fpga/ifpga-sec-mgr.c
>>   create mode 100644 include/linux/fpga/ifpga-sec-mgr.h
>>
>> diff --git a/Documentation/ABI/testing/sysfs-class-ifpga-sec-mgr b/Documentation/ABI/testing/sysfs-class-ifpga-sec-mgr
>> new file mode 100644
>> index 000000000000..86f8992559bf
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/sysfs-class-ifpga-sec-mgr
>> @@ -0,0 +1,75 @@
>> +What: 		/sys/class/ifpga_sec_mgr/ifpga_secX/name
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Name of low level fpga security manager driver.
>> +
>> +What: 		/sys/class/ifpga_sec_mgr/ifpga_secX/security/sr_root_entry_hash
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +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".
>> +
>> +What: 		/sys/class/ifpga_sec_mgr/ifpga_secX/security/pr_root_entry_hash
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +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/ifpga_sec_mgr/ifpga_secX/security/bmc_root_entry_hash
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +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/ifpga_sec_mgr/ifpga_secX/security/sr_canceled_csks
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +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/ifpga_sec_mgr/ifpga_secX/security/pr_canceled_csks
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +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/ifpga_sec_mgr/ifpga_secX/security/bmc_canceled_csks
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +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/ifpga_sec_mgr/ifpga_secX/security/user_flash_count
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +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: "%d".
>> +
>> +What: 		/sys/class/ifpga_sec_mgr/ifpga_secX/security/bmc_flash_count
>> +Date:		Sep 2020
>> +KernelVersion:  5.10
>> +Contact:	Russ Weight <russell.h.weight@...el.com>
>> +Description:	Read only. Returns number of times the BMC image has been
>> +		flashed.
>> +		Format: "%d".
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index deaafb617361..4a2ebe6b120d 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -6830,6 +6830,14 @@ F:	Documentation/fpga/
>>   F:	drivers/fpga/
>>   F:	include/linux/fpga/
>>   
>> +INTEL 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-ifpga-sec-mgr
>> +F:	drivers/fpga/ifpga-sec-mgr.c
>> +F:	include/linux/fpga/ifpga-sec-mgr.h
> Generally not against having more people help out, but do we need a
> per driver maintainer?
>
>> +
>>   FPU EMULATOR
>>   M:	Bill Metzenthen <billm@...bpc.org.au>
>>   S:	Maintained
>> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
>> index 88f64fbf55e3..97c0a6cc2ba7 100644
>> --- a/drivers/fpga/Kconfig
>> +++ b/drivers/fpga/Kconfig
>> @@ -235,4 +235,13 @@ config FPGA_MGR_ZYNQMP_FPGA
>>   	  to configure the programmable logic(PL) through PS
>>   	  on ZynqMP SoC.
>>   
>> +config IFPGA_SEC_MGR
>> +	tristate "Intel Security Manager for FPGA"
>> +        help
>> +	  The Intel Security Manager class driver presents a common
>> +	  user API for managing secure updates for Intel 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 c69bfc931519..ec9fbacdedd8 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-$(CONFIG_ALTERA_PR_IP_CORE_PLAT)    += altera-pr-ip-core-plat.o
>>   
>> +# Intel FPGA Security Manager Framework
>> +obj-$(CONFIG_IFPGA_SEC_MGR)		+= ifpga-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/ifpga-sec-mgr.c b/drivers/fpga/ifpga-sec-mgr.c
>> new file mode 100644
>> index 000000000000..97bf80277ed2
>> --- /dev/null
>> +++ b/drivers/fpga/ifpga-sec-mgr.c
>> @@ -0,0 +1,339 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Intel Security Manager for FPGA
>> + *
>> + * Copyright (C) 2019-2020 Intel Corporation, Inc.
>> + */
>> +
>> +#include <linux/fpga/ifpga-sec-mgr.h>
>> +#include <linux/idr.h>
>> +#include <linux/module.h>
>> +#include <linux/slab.h>
>> +#include <linux/vmalloc.h>
>> +
>> +static DEFINE_IDA(ifpga_sec_mgr_ida);
>> +static struct class *ifpga_sec_mgr_class;
>> +
>> +static ssize_t show_canceled_csk(struct ifpga_sec_mgr *imgr,
>> +				 sysfs_csk_hndlr_t get_csk,
>> +				 sysfs_csk_nbits_t get_csk_nbits,
>> +				 char *buf)
>> +{
>> +	unsigned long *csk_map = NULL;
>> +	unsigned int nbits;
>> +	int cnt, ret;
>> +
>> +	ret = get_csk_nbits(imgr);
>> +	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(imgr, csk_map, nbits);
>> +	if (ret)
>> +		goto vfree_exit;
>> +
>> +	cnt = bitmap_print_to_pagebuf(1, buf, csk_map, nbits);
>> +
>> +vfree_exit:
>> +	vfree(csk_map);
>> +	return ret ? : cnt;
>> +}
>> +
>> +static ssize_t show_root_entry_hash(struct ifpga_sec_mgr *imgr,
>> +				    sysfs_reh_hndlr_t get_reh,
>> +				    sysfs_reh_size_t get_reh_size,
>> +				    char *buf)
>> +{
>> +	unsigned int size, i;
>> +	int ret, cnt = 0;
>> +	u8 *hash;
>> +
>> +	ret = get_reh_size(imgr);
>> +	if (ret < 0)
>> +		return ret;
>> +	else if (!ret)
>> +		return sprintf(buf, "hash not programmed\n");
>> +
>> +	size = (unsigned int)ret;
>> +	hash = vmalloc(size);
>> +	if (!hash)
>> +		return -ENOMEM;
>> +
>> +	ret = get_reh(imgr, 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 to_sec_mgr(d) container_of(d, struct ifpga_sec_mgr, dev)
>> +
>> +#define DEVICE_ATTR_SEC_CSK(_name) \
>> +static ssize_t _name##_canceled_csks_show(struct device *dev, \
>> +					  struct device_attribute *attr, \
>> +					  char *buf) \
>> +{ \
>> +	struct ifpga_sec_mgr *imgr = to_sec_mgr(dev); \
>> +	return show_canceled_csk(imgr, \
>> +	       imgr->iops->_name##_canceled_csks, \
>> +	       imgr->iops->_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 ifpga_sec_mgr *imgr = to_sec_mgr(dev); \
>> +	return show_root_entry_hash(imgr, \
>> +	       imgr->iops->_name##_root_entry_hash, \
>> +	       imgr->iops->_name##_reh_size, buf); \
>> +} \
>> +static DEVICE_ATTR_RO(_name##_root_entry_hash)
>> +
>> +#define DEVICE_ATTR_SEC_FLASH_CNT(_name) \
>> +static ssize_t _name##_flash_count_show(struct device *dev, \
>> +		    struct device_attribute *attr, char *buf) \
>> +{ \
>> +	struct ifpga_sec_mgr *imgr = to_sec_mgr(dev); \
>> +	int cnt = imgr->iops->_name##_flash_count(imgr); \
>> +	return cnt < 0 ? cnt : sprintf(buf, "%d\n", cnt); \
>> +} \
>> +static DEVICE_ATTR_RO(_name##_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_FLASH_CNT(user);
>> +DEVICE_ATTR_SEC_FLASH_CNT(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_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 && imgr->iops->_name)
>> +
>> +static umode_t sec_mgr_visible(struct kobject *kobj,
>> +			       struct attribute *attr, int n)
>> +{
>> +	struct ifpga_sec_mgr *imgr = to_sec_mgr(kobj_to_dev(kobj));
>> +
>> +	if (check_attr(attr, user_flash_count) ||
>> +	    check_attr(attr, bmc_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 ifpga_sec_mgr *imgr = to_sec_mgr(dev);
>> +
>> +	return sprintf(buf, "%s\n", imgr->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 *ifpga_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)
>> +{
>> +	if (sysfs_handler) {
>> +		if (!size_handler) {
>> +			dev_err(dev, "%s registered without %s\n",
>> +				sysfs_handler_name, size_handler_name);
>> +			return false;
>> +		}
>> +	} else if (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, _iops, _name) \
>> +	check_sysfs_handler(_dev, (_iops)->_name##_root_entry_hash, \
>> +			    (_iops)->_name##_reh_size, \
>> +			    __stringify(_name##_root_entry_hash), \
>> +			    __stringify(_name##_reh_size))
>> +
>> +#define check_csk_handler(_dev, _iops, _name) \
>> +	check_sysfs_handler(_dev, (_iops)->_name##_canceled_csks, \
>> +			    (_iops)->_name##_canceled_csk_nbits, \
>> +			    __stringify(_name##_canceled_csks), \
>> +			    __stringify(_name##_canceled_csk_nbits))
>> +
>> +/**
>> + * ifpga_sec_mgr_register - register an IFPGA security manager struct
>> + *
>> + * @dev:  create ifpga security manager device from pdev
>> + * @name: ifpga security manager name
>> + * @iops: pointer to a structure of ifpga callback functions
>> + * @priv: ifpga security manager private data
>> + *
>> + * Returns &struct ifpga_sec_mgr pointer on success, or ERR_PTR() on error.
>> + */
>> +struct ifpga_sec_mgr *
>> +ifpga_sec_mgr_register(struct device *dev, const char *name,
>> +		       const struct ifpga_sec_mgr_ops *iops, void *priv)
>> +{
>> +	struct ifpga_sec_mgr *imgr;
>> +	int id, ret;
>> +
>> +	if (!check_reh_handler(dev, iops, bmc) ||
>> +	    !check_reh_handler(dev, iops, sr) ||
>> +	    !check_reh_handler(dev, iops, pr) ||
>> +	    !check_csk_handler(dev, iops, bmc) ||
>> +	    !check_csk_handler(dev, iops, sr) ||
>> +	    !check_csk_handler(dev, iops, pr)) {
>> +		return ERR_PTR(-EINVAL);
>> +	}
>> +
>> +	if (!name || !strlen(name)) {
>> +		dev_err(dev, "Attempt to register with no name!\n");
>> +		return ERR_PTR(-EINVAL);
>> +	}
>> +
>> +	imgr = kzalloc(sizeof(*imgr), GFP_KERNEL);
>> +	if (!imgr)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	imgr->name = name;
>> +	imgr->priv = priv;
>> +	imgr->iops = iops;
>> +	mutex_init(&imgr->lock);
>> +
>> +	id = ida_simple_get(&ifpga_sec_mgr_ida, 0, 0, GFP_KERNEL);
>> +	if (id < 0) {
>> +		ret = id;
>> +		goto exit_free;
>> +	}
>> +
>> +	imgr->dev.class = ifpga_sec_mgr_class;
>> +	imgr->dev.parent = dev;
>> +	imgr->dev.id = id;
>> +
>> +	ret = dev_set_name(&imgr->dev, "ifpga_sec%d", id);
>> +	if (ret) {
>> +		dev_err(dev, "Failed to set device name: ifpga_sec%d\n", id);
>> +		ida_simple_remove(&ifpga_sec_mgr_ida, id);
>> +		goto exit_free;
>> +	}
>> +
>> +	ret = device_register(&imgr->dev);
>> +	if (ret) {
>> +		put_device(&imgr->dev);
>> +		return ERR_PTR(ret);
>> +	}
>> +
>> +	return imgr;
>> +
>> +exit_free:
>> +	kfree(dev);
>> +	return ERR_PTR(ret);
>> +}
>> +EXPORT_SYMBOL_GPL(ifpga_sec_mgr_register);
>> +
>> +/**
>> + * ifpga_sec_mgr_unregister - unregister a IFPGA security manager
>> + *
>> + * @mgr: fpga manager struct
>> + *
>> + * This function is intended for use in a IFPGA security manager
>> + * driver's remove() function.
>> + */
>> +void ifpga_sec_mgr_unregister(struct ifpga_sec_mgr *imgr)
>> +{
>> +	dev_info(&imgr->dev, "%s %s\n", __func__, imgr->name);
>> +
>> +	device_unregister(&imgr->dev);
>> +}
>> +EXPORT_SYMBOL_GPL(ifpga_sec_mgr_unregister);
>> +
>> +static void ifpga_sec_mgr_dev_release(struct device *dev)
>> +{
>> +	struct ifpga_sec_mgr *imgr = to_sec_mgr(dev);
>> +
>> +	mutex_destroy(&imgr->lock);
>> +	ida_simple_remove(&ifpga_sec_mgr_ida, imgr->dev.id);
>> +	kfree(imgr);
>> +}
>> +
>> +static int __init ifpga_sec_mgr_class_init(void)
>> +{
>> +	pr_info("Intel FPGA Security Manager\n");
>> +
>> +	ifpga_sec_mgr_class = class_create(THIS_MODULE, "ifpga_sec_mgr");
>> +	if (IS_ERR(ifpga_sec_mgr_class))
>> +		return PTR_ERR(ifpga_sec_mgr_class);
>> +
>> +	ifpga_sec_mgr_class->dev_groups = ifpga_sec_mgr_attr_groups;
>> +	ifpga_sec_mgr_class->dev_release = ifpga_sec_mgr_dev_release;
>> +
>> +	return 0;
>> +}
>> +
>> +static void __exit ifpga_sec_mgr_class_exit(void)
>> +{
>> +	class_destroy(ifpga_sec_mgr_class);
>> +	ida_destroy(&ifpga_sec_mgr_ida);
>> +}
>> +
>> +MODULE_DESCRIPTION("Intel FPGA Security Manager Driver");
>> +MODULE_LICENSE("GPL v2");
>> +
>> +subsys_initcall(ifpga_sec_mgr_class_init);
>> +module_exit(ifpga_sec_mgr_class_exit)
>> diff --git a/include/linux/fpga/ifpga-sec-mgr.h b/include/linux/fpga/ifpga-sec-mgr.h
>> new file mode 100644
>> index 000000000000..e391b0c8f448
>> --- /dev/null
>> +++ b/include/linux/fpga/ifpga-sec-mgr.h
>> @@ -0,0 +1,145 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * Header file for Intel FPGA Security Manager
>> + *
>> + * Copyright (C) 2019-2020 Intel Corporation, Inc.
>> + */
>> +#ifndef _LINUX_IFPGA_SEC_MGR_H
>> +#define _LINUX_IFPGA_SEC_MGR_H
>> +
>> +#include <linux/device.h>
>> +#include <linux/mutex.h>
>> +#include <linux/types.h>
>> +
>> +struct ifpga_sec_mgr;
>> +
>> +/**
>> + * typedef sysfs_reh_size_t - Function to return byte size of root entry hash
>> + *
>> + * @imgr:      pointer to security manager structure
>> + *
>> + * This datatype is used to define a function that returns the byte size of a
>> + * root entry hash.
>> + *
>> + * Context: No locking requirements are imposed by the security manager.
>> + * Return:  Byte count on success, negative errno on failure
>> + */
>> +typedef int (*sysfs_reh_size_t)(struct ifpga_sec_mgr *imgr);
>> +
>> +/**
>> + * typedef sysfs_reh_hndlr_t - Function pointer to sysfs file handler
>> + *			       for root entry hashes
>> + * @imgr:      pointer to security manager structure
>> + * @hash:      pointer to an array of bytes in which to store the hash
>> + * @size:      byte size of root entry hash
>> + *
>> + * This datatype is used to define a sysfs file handler function to
>> + * return root entry hash data to be displayed via sysfs.
>> + *
>> + * Context: No locking requirements are imposed by the security manager.
>> + * Return:  0 on success, negative errno on failure
>> + */
>> +typedef int (*sysfs_reh_hndlr_t)(struct ifpga_sec_mgr *imgr, u8 *hash,
>> +				 unsigned int size);
>> +
>> +/**
>> + * typedef sysfs_cnt_hndlr_t - Function pointer to sysfs file handler
>> + *			       for flash counts
>> + * @imgr: pointer to security manager structure
>> + *
>> + * This datatype is used to define a sysfs file handler function to
>> + * return a flash count to be displayed via sysfs.
>> + *
>> + * Context: No locking requirements are imposed by the security manager
>> + * Return: flash count or negative errno
>> + */
>> +typedef int (*sysfs_cnt_hndlr_t)(struct ifpga_sec_mgr *imgr);
>> +
>> +/**
>> + * typedef sysfs_csk_nbits_t - Function to return the number of bits in
>> + *				      a Code Signing Key cancellation vector
>> + *
>> + * @imgr:      pointer to security manager structure
>> + *
>> + * This datatype is used to define a function that returns the number of bits
>> + * in a Code Signing Key cancellation vector.
>> + *
>> + * Context: No locking requirements are imposed by the security manager.
>> + * Return:  Number of bits on success, negative errno on failure
>> + */
>> +typedef int (*sysfs_csk_nbits_t)(struct ifpga_sec_mgr *imgr);
>> +
>> +/**
>> + * typedef sysfs_csk_hndlr_t - Function pointer to sysfs file handler
>> + *			       bit vector of canceled keys
>> + *
>> + * @imgr:    pointer to security manager structure
>> + * @csk_map: pointer to a bitmap to contain cancellation key vector
>> + * @nbits:   number of bits in CSK vector
>> + *
>> + * This datatype is used to define a sysfs file handler function to
>> + * return a bitmap of canceled keys to be displayed via sysfs.
>> + *
>> + * Context: No locking requirements are imposed by the security manager.
>> + * Return:  0 on success, negative errno on failure
>> + */
>> +typedef int (*sysfs_csk_hndlr_t)(struct ifpga_sec_mgr *imgr,
>> +				 unsigned long *csk_map, unsigned int nbits);
>> +
>> +/**
>> + * struct ifpga_sec_mgr_ops - device specific operations
>> + * @user_flash_count:	    Optional: Return sysfs string output for FPGA
>> + *			    image flash count
>> + * @bmc_flash_count:	    Optional: Return sysfs string output for BMC
>> + *			    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 ifpga_sec_mgr_ops {
>> +	sysfs_cnt_hndlr_t user_flash_count;
>> +	sysfs_cnt_hndlr_t bmc_flash_count;
>> +	sysfs_cnt_hndlr_t smbus_flash_count;
>> +	sysfs_reh_hndlr_t sr_root_entry_hash;
>> +	sysfs_reh_hndlr_t pr_root_entry_hash;
>> +	sysfs_reh_hndlr_t bmc_root_entry_hash;
>> +	sysfs_csk_hndlr_t sr_canceled_csks;
>> +	sysfs_csk_hndlr_t pr_canceled_csks;
>> +	sysfs_csk_hndlr_t bmc_canceled_csks;
>> +	sysfs_reh_size_t bmc_reh_size;
>> +	sysfs_reh_size_t sr_reh_size;
>> +	sysfs_reh_size_t pr_reh_size;
>> +	sysfs_csk_nbits_t bmc_canceled_csk_nbits;
>> +	sysfs_csk_nbits_t sr_canceled_csk_nbits;
>> +	sysfs_csk_nbits_t pr_canceled_csk_nbits;
>> +};
>> +
>> +struct ifpga_sec_mgr {
>> +	const char *name;
>> +	struct device dev;
>> +	const struct ifpga_sec_mgr_ops *iops;
>> +	struct mutex lock;		/* protect data structure contents */
>> +	void *priv;
>> +};
>> +
>> +struct ifpga_sec_mgr *
>> +ifpga_sec_mgr_register(struct device *dev, const char *name,
>> +		       const struct ifpga_sec_mgr_ops *iops, void *priv);
>> +void ifpga_sec_mgr_unregister(struct ifpga_sec_mgr *imgr);
>> +
>> +#endif
>> -- 
>> 2.17.1
>>
> This will take me a while,
>
> Thanks,
> Moritz

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