xref: /linux/arch/s390/kernel/cpacf.c (revision 3ea5eb68b9d624935108b5e696859304edfac202)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright IBM Corp. 2024
4  */
5 
6 #define KMSG_COMPONENT "cpacf"
7 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
8 
9 #include <linux/cpu.h>
10 #include <linux/device.h>
11 #include <linux/sysfs.h>
12 #include <asm/cpacf.h>
13 
14 #define CPACF_QUERY(name, instruction)						\
15 static ssize_t name##_query_raw_read(struct file *fp,				\
16 				     struct kobject *kobj,			\
17 				     struct bin_attribute *attr,		\
18 				     char *buf, loff_t offs,			\
19 				     size_t count)				\
20 {										\
21 	cpacf_mask_t mask;							\
22 										\
23 	if (!cpacf_query(CPACF_##instruction, &mask))				\
24 		return -EOPNOTSUPP;						\
25 	return memory_read_from_buffer(buf, count, &offs, &mask, sizeof(mask));	\
26 }										\
27 static BIN_ATTR_RO(name##_query_raw, sizeof(cpacf_mask_t))
28 
29 CPACF_QUERY(km, KM);
30 CPACF_QUERY(kmc, KMC);
31 CPACF_QUERY(kimd, KIMD);
32 CPACF_QUERY(klmd, KLMD);
33 CPACF_QUERY(kmac, KMAC);
34 CPACF_QUERY(pckmo, PCKMO);
35 CPACF_QUERY(kmf, KMF);
36 CPACF_QUERY(kmctr, KMCTR);
37 CPACF_QUERY(kmo, KMO);
38 CPACF_QUERY(pcc, PCC);
39 CPACF_QUERY(prno, PRNO);
40 CPACF_QUERY(kma, KMA);
41 CPACF_QUERY(kdsa, KDSA);
42 
43 #define CPACF_QAI(name, instruction)				\
44 static ssize_t name##_query_auth_info_raw_read(			\
45 	struct file *fp, struct kobject *kobj,			\
46 	struct bin_attribute *attr, char *buf, loff_t offs,	\
47 	size_t count)						\
48 {								\
49 	cpacf_qai_t qai;					\
50 								\
51 	if (!cpacf_qai(CPACF_##instruction, &qai))		\
52 		return -EOPNOTSUPP;				\
53 	return memory_read_from_buffer(buf, count, &offs, &qai, \
54 					sizeof(qai));		\
55 }								\
56 static BIN_ATTR_RO(name##_query_auth_info_raw, sizeof(cpacf_qai_t))
57 
58 CPACF_QAI(km, KM);
59 CPACF_QAI(kmc, KMC);
60 CPACF_QAI(kimd, KIMD);
61 CPACF_QAI(klmd, KLMD);
62 CPACF_QAI(kmac, KMAC);
63 CPACF_QAI(pckmo, PCKMO);
64 CPACF_QAI(kmf, KMF);
65 CPACF_QAI(kmctr, KMCTR);
66 CPACF_QAI(kmo, KMO);
67 CPACF_QAI(pcc, PCC);
68 CPACF_QAI(prno, PRNO);
69 CPACF_QAI(kma, KMA);
70 CPACF_QAI(kdsa, KDSA);
71 
72 static struct bin_attribute *cpacf_attrs[] = {
73 	&bin_attr_km_query_raw,
74 	&bin_attr_kmc_query_raw,
75 	&bin_attr_kimd_query_raw,
76 	&bin_attr_klmd_query_raw,
77 	&bin_attr_kmac_query_raw,
78 	&bin_attr_pckmo_query_raw,
79 	&bin_attr_kmf_query_raw,
80 	&bin_attr_kmctr_query_raw,
81 	&bin_attr_kmo_query_raw,
82 	&bin_attr_pcc_query_raw,
83 	&bin_attr_prno_query_raw,
84 	&bin_attr_kma_query_raw,
85 	&bin_attr_kdsa_query_raw,
86 	&bin_attr_km_query_auth_info_raw,
87 	&bin_attr_kmc_query_auth_info_raw,
88 	&bin_attr_kimd_query_auth_info_raw,
89 	&bin_attr_klmd_query_auth_info_raw,
90 	&bin_attr_kmac_query_auth_info_raw,
91 	&bin_attr_pckmo_query_auth_info_raw,
92 	&bin_attr_kmf_query_auth_info_raw,
93 	&bin_attr_kmctr_query_auth_info_raw,
94 	&bin_attr_kmo_query_auth_info_raw,
95 	&bin_attr_pcc_query_auth_info_raw,
96 	&bin_attr_prno_query_auth_info_raw,
97 	&bin_attr_kma_query_auth_info_raw,
98 	&bin_attr_kdsa_query_auth_info_raw,
99 	NULL,
100 };
101 
102 static const struct attribute_group cpacf_attr_grp = {
103 	.name = "cpacf",
104 	.bin_attrs = cpacf_attrs,
105 };
106 
107 static int __init cpacf_init(void)
108 {
109 	struct device *cpu_root;
110 	int rc = 0;
111 
112 	cpu_root = bus_get_dev_root(&cpu_subsys);
113 	if (cpu_root) {
114 		rc = sysfs_create_group(&cpu_root->kobj, &cpacf_attr_grp);
115 		put_device(cpu_root);
116 	}
117 	return rc;
118 }
119 device_initcall(cpacf_init);
120