// SPDX-License-Identifier: GPL-2.0-only /* Copyright(c) 2022 Intel Corporation. */ #include <linux/module.h> #include <linux/kdev_t.h> #include <linux/semaphore.h> #include <linux/slab.h> #include <asm/cpu_device_id.h> #include "ifs.h" #define X86_MATCH(model) \ X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, \ INTEL_FAM6_##model, X86_FEATURE_CORE_CAPABILITIES, NULL) static const struct x86_cpu_id ifs_cpu_ids[] __initconst = { X86_MATCH(SAPPHIRERAPIDS_X), {} }; MODULE_DEVICE_TABLE(x86cpu, ifs_cpu_ids); static struct ifs_device ifs_device = { .data = { .integrity_cap_bit = MSR_INTEGRITY_CAPS_PERIODIC_BIST_BIT, .test_num = 0, }, .misc = { .name = "intel_ifs_0", .nodename = "intel_ifs/0", .minor = MISC_DYNAMIC_MINOR, }, }; static int __init ifs_init(void) { const struct x86_cpu_id *m; u64 msrval; int ret; m = x86_match_cpu(ifs_cpu_ids); if (!m) return -ENODEV; if (rdmsrl_safe(MSR_IA32_CORE_CAPS, &msrval)) return -ENODEV; if (!(msrval & MSR_IA32_CORE_CAPS_INTEGRITY_CAPS)) return -ENODEV; if (rdmsrl_safe(MSR_INTEGRITY_CAPS, &msrval)) return -ENODEV; ifs_device.misc.groups = ifs_get_groups(); if (!(msrval & BIT(ifs_device.data.integrity_cap_bit))) return -ENODEV; ifs_device.data.pkg_auth = kmalloc_array(topology_max_packages(), sizeof(bool), GFP_KERNEL); if (!ifs_device.data.pkg_auth) return -ENOMEM; ret = misc_register(&ifs_device.misc); if (ret) { kfree(ifs_device.data.pkg_auth); return ret; } return 0; } static void __exit ifs_exit(void) { misc_deregister(&ifs_device.misc); kfree(ifs_device.data.pkg_auth); } module_init(ifs_init); module_exit(ifs_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Intel In Field Scan (IFS) device");