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1// SPDX-License-Identifier: GPL-2.0-only2/* Copyright(c) 2022 Intel Corporation. */3 4#include <linux/bitfield.h>5#include <linux/module.h>6#include <linux/kdev_t.h>7#include <linux/semaphore.h>8#include <linux/slab.h>9 10#include <asm/cpu_device_id.h>11 12#include "ifs.h"13 14#define X86_MATCH(vfm, array_gen)				\15	X86_MATCH_VFM_FEATURE(vfm, X86_FEATURE_CORE_CAPABILITIES, array_gen)16 17static const struct x86_cpu_id ifs_cpu_ids[] __initconst = {18	X86_MATCH(INTEL_SAPPHIRERAPIDS_X, ARRAY_GEN0),19	X86_MATCH(INTEL_EMERALDRAPIDS_X, ARRAY_GEN0),20	X86_MATCH(INTEL_GRANITERAPIDS_X, ARRAY_GEN0),21	X86_MATCH(INTEL_GRANITERAPIDS_D, ARRAY_GEN0),22	X86_MATCH(INTEL_ATOM_CRESTMONT_X, ARRAY_GEN1),23	{}24};25MODULE_DEVICE_TABLE(x86cpu, ifs_cpu_ids);26 27ATTRIBUTE_GROUPS(plat_ifs);28ATTRIBUTE_GROUPS(plat_ifs_array);29 30bool *ifs_pkg_auth;31 32static const struct ifs_test_caps scan_test = {33	.integrity_cap_bit = MSR_INTEGRITY_CAPS_PERIODIC_BIST_BIT,34	.test_num = IFS_TYPE_SAF,35	.image_suffix = "scan",36};37 38static const struct ifs_test_caps array_test = {39	.integrity_cap_bit = MSR_INTEGRITY_CAPS_ARRAY_BIST_BIT,40	.test_num = IFS_TYPE_ARRAY_BIST,41};42 43static const struct ifs_test_msrs scan_msrs = {44	.copy_hashes = MSR_COPY_SCAN_HASHES,45	.copy_hashes_status = MSR_SCAN_HASHES_STATUS,46	.copy_chunks = MSR_AUTHENTICATE_AND_COPY_CHUNK,47	.copy_chunks_status = MSR_CHUNKS_AUTHENTICATION_STATUS,48	.test_ctrl = MSR_SAF_CTRL,49};50 51static const struct ifs_test_msrs sbaf_msrs = {52	.copy_hashes = MSR_COPY_SBAF_HASHES,53	.copy_hashes_status = MSR_SBAF_HASHES_STATUS,54	.copy_chunks = MSR_AUTHENTICATE_AND_COPY_SBAF_CHUNK,55	.copy_chunks_status = MSR_SBAF_CHUNKS_AUTHENTICATION_STATUS,56	.test_ctrl = MSR_SBAF_CTRL,57};58 59static const struct ifs_test_caps sbaf_test = {60	.integrity_cap_bit = MSR_INTEGRITY_CAPS_SBAF_BIT,61	.test_num = IFS_TYPE_SBAF,62	.image_suffix = "sbft",63};64 65static struct ifs_device ifs_devices[] = {66	[IFS_TYPE_SAF] = {67		.test_caps = &scan_test,68		.test_msrs = &scan_msrs,69		.misc = {70			.name = "intel_ifs_0",71			.minor = MISC_DYNAMIC_MINOR,72			.groups = plat_ifs_groups,73		},74	},75	[IFS_TYPE_ARRAY_BIST] = {76		.test_caps = &array_test,77		.misc = {78			.name = "intel_ifs_1",79			.minor = MISC_DYNAMIC_MINOR,80			.groups = plat_ifs_array_groups,81		},82	},83	[IFS_TYPE_SBAF] = {84		.test_caps = &sbaf_test,85		.test_msrs = &sbaf_msrs,86		.misc = {87			.name = "intel_ifs_2",88			.minor = MISC_DYNAMIC_MINOR,89			.groups = plat_ifs_groups,90		},91	},92};93 94#define IFS_NUMTESTS ARRAY_SIZE(ifs_devices)95 96static void ifs_cleanup(void)97{98	int i;99 100	for (i = 0; i < IFS_NUMTESTS; i++) {101		if (ifs_devices[i].misc.this_device)102			misc_deregister(&ifs_devices[i].misc);103	}104	kfree(ifs_pkg_auth);105}106 107static int __init ifs_init(void)108{109	const struct x86_cpu_id *m;110	u64 msrval;111	int i, ret;112 113	m = x86_match_cpu(ifs_cpu_ids);114	if (!m)115		return -ENODEV;116 117	if (rdmsrl_safe(MSR_IA32_CORE_CAPS, &msrval))118		return -ENODEV;119 120	if (!(msrval & MSR_IA32_CORE_CAPS_INTEGRITY_CAPS))121		return -ENODEV;122 123	if (rdmsrl_safe(MSR_INTEGRITY_CAPS, &msrval))124		return -ENODEV;125 126	ifs_pkg_auth = kmalloc_array(topology_max_packages(), sizeof(bool), GFP_KERNEL);127	if (!ifs_pkg_auth)128		return -ENOMEM;129 130	for (i = 0; i < IFS_NUMTESTS; i++) {131		if (!(msrval & BIT(ifs_devices[i].test_caps->integrity_cap_bit)))132			continue;133		ifs_devices[i].rw_data.generation = FIELD_GET(MSR_INTEGRITY_CAPS_SAF_GEN_MASK,134							      msrval);135		ifs_devices[i].rw_data.array_gen = (u32)m->driver_data;136		ret = misc_register(&ifs_devices[i].misc);137		if (ret)138			goto err_exit;139	}140	return 0;141 142err_exit:143	ifs_cleanup();144	return ret;145}146 147static void __exit ifs_exit(void)148{149	ifs_cleanup();150}151 152module_init(ifs_init);153module_exit(ifs_exit);154 155MODULE_LICENSE("GPL");156MODULE_DESCRIPTION("Intel In Field Scan (IFS) device");157