// 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), X86_MATCH(EMERALDRAPIDS_X), {} }; MODULE_DEVICE_TABLE(x86cpu, ifs_cpu_ids); ATTRIBUTE_GROUPS(plat_ifs); ATTRIBUTE_GROUPS(plat_ifs_array); bool *ifs_pkg_auth; static const struct ifs_test_caps scan_test = { .integrity_cap_bit = MSR_INTEGRITY_CAPS_PERIODIC_BIST_BIT, .test_num = IFS_TYPE_SAF, }; static const struct ifs_test_caps array_test = { .integrity_cap_bit = MSR_INTEGRITY_CAPS_ARRAY_BIST_BIT, .test_num = IFS_TYPE_ARRAY_BIST, }; static struct ifs_device ifs_devices[] = { [IFS_TYPE_SAF] = { .test_caps = &scan_test, .misc = { .name = "intel_ifs_0", .minor = MISC_DYNAMIC_MINOR, .groups = plat_ifs_groups, }, }, [IFS_TYPE_ARRAY_BIST] = { .test_caps = &array_test, .misc = { .name = "intel_ifs_1", .minor = MISC_DYNAMIC_MINOR, .groups = plat_ifs_array_groups, }, }, }; #define IFS_NUMTESTS ARRAY_SIZE(ifs_devices) static void ifs_cleanup(void) { int i; for (i = 0; i < IFS_NUMTESTS; i++) { if (ifs_devices[i].misc.this_device) misc_deregister(&ifs_devices[i].misc); } kfree(ifs_pkg_auth); } static int __init ifs_init(void) { const struct x86_cpu_id *m; u64 msrval; int i, 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_pkg_auth = kmalloc_array(topology_max_packages(), sizeof(bool), GFP_KERNEL); if (!ifs_pkg_auth) return -ENOMEM; for (i = 0; i < IFS_NUMTESTS; i++) { if (!(msrval & BIT(ifs_devices[i].test_caps->integrity_cap_bit))) continue; ret = misc_register(&ifs_devices[i].misc); if (ret) goto err_exit; } return 0; err_exit: ifs_cleanup(); return ret; } static void __exit ifs_exit(void) { ifs_cleanup(); } module_init(ifs_init); module_exit(ifs_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Intel In Field Scan (IFS) device");