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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2022 Intel Corporation. */
#include <linux/bitfield.h>
#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, array_gen) \
X86_MATCH_VENDOR_FAM_MODEL_FEATURE(INTEL, 6, \
INTEL_FAM6_##model, X86_FEATURE_CORE_CAPABILITIES, array_gen)
static const struct x86_cpu_id ifs_cpu_ids[] __initconst = {
X86_MATCH(SAPPHIRERAPIDS_X, ARRAY_GEN0),
X86_MATCH(EMERALDRAPIDS_X, ARRAY_GEN0),
X86_MATCH(GRANITERAPIDS_X, ARRAY_GEN0),
X86_MATCH(GRANITERAPIDS_D, ARRAY_GEN0),
X86_MATCH(ATOM_CRESTMONT_X, ARRAY_GEN1),
{}
};
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;
ifs_devices[i].rw_data.generation = FIELD_GET(MSR_INTEGRITY_CAPS_SAF_GEN_MASK,
msrval);
ifs_devices[i].rw_data.array_gen = (u32)m->driver_data;
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");
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