arch/s390/kernel/cpacf.c

   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);