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// 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 <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,
},
.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;
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)) &&
!misc_register(&ifs_device.misc)) {
down(&ifs_sem);
ifs_load_firmware(ifs_device.misc.this_device);
up(&ifs_sem);
return 0;
}
return -ENODEV;
}
static void __exit ifs_exit(void)
{
misc_deregister(&ifs_device.misc);
}
module_init(ifs_init);
module_exit(ifs_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Intel In Field Scan (IFS) device");
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