1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Implementation of get_cpuid().
4 *
5 * Copyright IBM Corp. 2014, 2018
6 * Author(s): Alexander Yarygin <yarygin@linux.vnet.ibm.com>
7 *	      Thomas Richter <tmricht@linux.vnet.ibm.com>
8 */
9
10#include <sys/types.h>
11#include <errno.h>
12#include <unistd.h>
13#include <stdio.h>
14#include <string.h>
15#include <linux/ctype.h>
16#include <linux/kernel.h>
17#include <linux/zalloc.h>
18
19#include "../../util/header.h"
20
21#define SYSINFO_MANU	"Manufacturer:"
22#define SYSINFO_TYPE	"Type:"
23#define SYSINFO_MODEL	"Model:"
24#define SRVLVL_CPUMF	"CPU-MF:"
25#define SRVLVL_VERSION	"version="
26#define SRVLVL_AUTHORIZATION	"authorization="
27#define SYSINFO		"/proc/sysinfo"
28#define SRVLVL		"/proc/service_levels"
29
30int get_cpuid(char *buffer, size_t sz)
31{
32	char *cp, *line = NULL, *line2;
33	char type[8], model[33], version[8], manufacturer[32], authorization[8];
34	int tpsize = 0, mdsize = 0, vssize = 0, mfsize = 0, atsize = 0;
35	int read;
36	unsigned long line_sz;
37	size_t nbytes;
38	FILE *sysinfo;
39
40	/*
41	 * Scan /proc/sysinfo line by line and read out values for
42	 * Manufacturer:, Type: and Model:, for example:
43	 * Manufacturer:    IBM
44	 * Type:            2964
45	 * Model:           702              N96
46	 * The first word is the Model Capacity and the second word is
47	 * Model (can be omitted). Both words have a maximum size of 16
48	 * bytes.
49	 */
50	memset(manufacturer, 0, sizeof(manufacturer));
51	memset(type, 0, sizeof(type));
52	memset(model, 0, sizeof(model));
53	memset(version, 0, sizeof(version));
54	memset(authorization, 0, sizeof(authorization));
55
56	sysinfo = fopen(SYSINFO, "r");
57	if (sysinfo == NULL)
58		return errno;
59
60	while ((read = getline(&line, &line_sz, sysinfo)) != -1) {
61		if (!strncmp(line, SYSINFO_MANU, strlen(SYSINFO_MANU))) {
62			line2 = line + strlen(SYSINFO_MANU);
63
64			while ((cp = strtok_r(line2, "\n ", &line2))) {
65				mfsize += scnprintf(manufacturer + mfsize,
66						    sizeof(manufacturer) - mfsize, "%s", cp);
67			}
68		}
69
70		if (!strncmp(line, SYSINFO_TYPE, strlen(SYSINFO_TYPE))) {
71			line2 = line + strlen(SYSINFO_TYPE);
72
73			while ((cp = strtok_r(line2, "\n ", &line2))) {
74				tpsize += scnprintf(type + tpsize,
75						    sizeof(type) - tpsize, "%s", cp);
76			}
77		}
78
79		if (!strncmp(line, SYSINFO_MODEL, strlen(SYSINFO_MODEL))) {
80			line2 = line + strlen(SYSINFO_MODEL);
81
82			while ((cp = strtok_r(line2, "\n ", &line2))) {
83				mdsize += scnprintf(model + mdsize, sizeof(model) - mdsize,
84						    "%s%s", model[0] ? "," : "", cp);
85			}
86			break;
87		}
88	}
89	fclose(sysinfo);
90
91	/* Missing manufacturer, type or model information should not happen */
92	if (!manufacturer[0] || !type[0] || !model[0])
93		return EINVAL;
94
95	/*
96	 * Scan /proc/service_levels and return the CPU-MF counter facility
97	 * version number and authorization level.
98	 * Optional, does not exist on z/VM guests.
99	 */
100	sysinfo = fopen(SRVLVL, "r");
101	if (sysinfo == NULL)
102		goto skip_sysinfo;
103	while ((read = getline(&line, &line_sz, sysinfo)) != -1) {
104		if (strncmp(line, SRVLVL_CPUMF, strlen(SRVLVL_CPUMF)))
105			continue;
106
107		line2 = line + strlen(SRVLVL_CPUMF);
108		while ((cp = strtok_r(line2, "\n ", &line2))) {
109			if (!strncmp(cp, SRVLVL_VERSION,
110				     strlen(SRVLVL_VERSION))) {
111				char *sep = strchr(cp, '=');
112
113				vssize += scnprintf(version + vssize,
114						    sizeof(version) - vssize, "%s", sep + 1);
115			}
116			if (!strncmp(cp, SRVLVL_AUTHORIZATION,
117				     strlen(SRVLVL_AUTHORIZATION))) {
118				char *sep = strchr(cp, '=');
119
120				atsize += scnprintf(authorization + atsize,
121						    sizeof(authorization) - atsize, "%s", sep + 1);
122			}
123		}
124	}
125	fclose(sysinfo);
126
127skip_sysinfo:
128	free(line);
129
130	if (version[0] && authorization[0] )
131		nbytes = snprintf(buffer, sz, "%s,%s,%s,%s,%s",
132				  manufacturer, type, model, version,
133				  authorization);
134	else
135		nbytes = snprintf(buffer, sz, "%s,%s,%s", manufacturer, type,
136				  model);
137	return (nbytes >= sz) ? ENOBUFS : 0;
138}
139
140char *get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
141{
142	char *buf = malloc(128);
143
144	if (buf && get_cpuid(buf, 128))
145		zfree(&buf);
146	return buf;
147}
148