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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/s390/kernel/cpacf.c
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// SPDX-License-Identifier: GPL-2.0

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/*

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 * Copyright IBM Corp. 2024

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 */

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#define pr_fmt(fmt) "cpacf: " fmt

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#include <linux/cpu.h>

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#include <linux/device.h>

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#include <linux/sysfs.h>

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#include <asm/cpacf.h>

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#define CPACF_QUERY(name, instruction)						\

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static ssize_t name##_query_raw_read(struct file *fp,				\

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				     struct kobject *kobj,			\

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				     const struct bin_attribute *attr,		\

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				     char *buf, loff_t offs,			\

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				     size_t count)				\

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{										\

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	cpacf_mask_t mask;							\

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										\

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	if (!cpacf_query(CPACF_##instruction, &mask))				\

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		return -EOPNOTSUPP;						\

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	return memory_read_from_buffer(buf, count, &offs, &mask, sizeof(mask));	\

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}										\

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static const BIN_ATTR_RO(name##_query_raw, sizeof(cpacf_mask_t))

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CPACF_QUERY(km, KM);

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CPACF_QUERY(kmc, KMC);

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CPACF_QUERY(kimd, KIMD);

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CPACF_QUERY(klmd, KLMD);

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CPACF_QUERY(kmac, KMAC);

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CPACF_QUERY(pckmo, PCKMO);

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CPACF_QUERY(kmf, KMF);

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CPACF_QUERY(kmctr, KMCTR);

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CPACF_QUERY(kmo, KMO);

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CPACF_QUERY(pcc, PCC);

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CPACF_QUERY(prno, PRNO);

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CPACF_QUERY(kma, KMA);

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CPACF_QUERY(kdsa, KDSA);

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#define CPACF_QAI(name, instruction)					\

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static ssize_t name##_query_auth_info_raw_read(				\

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	struct file *fp, struct kobject *kobj,				\

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	const struct bin_attribute *attr, char *buf, loff_t offs,	\

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	size_t count)							\

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{									\

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	cpacf_qai_t qai;						\

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									\

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	if (!cpacf_qai(CPACF_##instruction, &qai))			\

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		return -EOPNOTSUPP;					\

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	return memory_read_from_buffer(buf, count, &offs, &qai,		\

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					sizeof(qai));			\

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}									\

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static const BIN_ATTR_RO(name##_query_auth_info_raw, sizeof(cpacf_qai_t))

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CPACF_QAI(km, KM);

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CPACF_QAI(kmc, KMC);

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CPACF_QAI(kimd, KIMD);

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CPACF_QAI(klmd, KLMD);

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CPACF_QAI(kmac, KMAC);

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CPACF_QAI(pckmo, PCKMO);

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CPACF_QAI(kmf, KMF);

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CPACF_QAI(kmctr, KMCTR);

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CPACF_QAI(kmo, KMO);

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CPACF_QAI(pcc, PCC);

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CPACF_QAI(prno, PRNO);

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CPACF_QAI(kma, KMA);

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CPACF_QAI(kdsa, KDSA);

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static const struct bin_attribute *const cpacf_attrs[] = {

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	&bin_attr_km_query_raw,

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	&bin_attr_kmc_query_raw,

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	&bin_attr_kimd_query_raw,

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	&bin_attr_klmd_query_raw,

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	&bin_attr_kmac_query_raw,

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	&bin_attr_pckmo_query_raw,

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	&bin_attr_kmf_query_raw,

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	&bin_attr_kmctr_query_raw,

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	&bin_attr_kmo_query_raw,

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	&bin_attr_pcc_query_raw,

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	&bin_attr_prno_query_raw,

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	&bin_attr_kma_query_raw,

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	&bin_attr_kdsa_query_raw,

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	&bin_attr_km_query_auth_info_raw,

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	&bin_attr_kmc_query_auth_info_raw,

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	&bin_attr_kimd_query_auth_info_raw,

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	&bin_attr_klmd_query_auth_info_raw,

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	&bin_attr_kmac_query_auth_info_raw,

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	&bin_attr_pckmo_query_auth_info_raw,

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	&bin_attr_kmf_query_auth_info_raw,

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	&bin_attr_kmctr_query_auth_info_raw,

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	&bin_attr_kmo_query_auth_info_raw,

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	&bin_attr_pcc_query_auth_info_raw,

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	&bin_attr_prno_query_auth_info_raw,

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	&bin_attr_kma_query_auth_info_raw,

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	&bin_attr_kdsa_query_auth_info_raw,

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	NULL,

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};

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static const struct attribute_group cpacf_attr_grp = {

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	.name = "cpacf",

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	.bin_attrs = cpacf_attrs,

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};

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static int __init cpacf_init(void)

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{

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	struct device *cpu_root;

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	int rc = 0;

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	cpu_root = bus_get_dev_root(&cpu_subsys);

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	if (cpu_root) {

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		rc = sysfs_create_group(&cpu_root->kobj, &cpacf_attr_grp);

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		put_device(cpu_root);

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	}

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	return rc;

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}

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device_initcall(cpacf_init);

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