1 // SPDX-License-Identifier: GPL-2.0
8 #include "helpers/helpers.h"
10 static const char *cpu_vendor_table
[X86_VENDOR_MAX
] = {
11 "Unknown", "GenuineIntel", "AuthenticAMD", "HygonGenuine",
14 #if defined(__i386__) || defined(__x86_64__)
20 * CPUID functions returning a single datum
22 * Define unsigned int cpuid_e[abcd]x(unsigned int op)
24 #define cpuid_func(reg) \
25 unsigned int cpuid_##reg(unsigned int op) \
27 unsigned int eax, ebx, ecx, edx; \
28 __cpuid(op, eax, ebx, ecx, edx); \
36 #endif /* defined(__i386__) || defined(__x86_64__) */
40 * Extract CPU vendor, family, model, stepping info from /proc/cpuinfo
42 * Returns 0 on success or a negativ error code
44 * TBD: Should there be a cpuid alternative for this if /proc is not mounted?
46 int get_cpu_info(struct cpupower_cpu_info
*cpu_info
)
51 unsigned int unknown
= 0xffffff;
52 unsigned int cpuid_level
, ext_cpuid_level
;
56 cpu_info
->vendor
= X86_VENDOR_UNKNOWN
;
57 cpu_info
->family
= unknown
;
58 cpu_info
->model
= unknown
;
59 cpu_info
->stepping
= unknown
;
62 fp
= fopen("/proc/cpuinfo", "r");
67 if (!fgets(value
, 64, fp
))
71 if (!strncmp(value
, "processor\t: ", 12))
72 sscanf(value
, "processor\t: %u", &proc
);
74 if (proc
!= (unsigned int)base_cpu
)
78 if (!strncmp(value
, "vendor_id", 9)) {
79 for (x
= 1; x
< X86_VENDOR_MAX
; x
++) {
80 if (strstr(value
, cpu_vendor_table
[x
]))
83 /* Get CPU family, etc. */
84 } else if (!strncmp(value
, "cpu family\t: ", 13)) {
85 sscanf(value
, "cpu family\t: %u",
87 } else if (!strncmp(value
, "model\t\t: ", 9)) {
88 sscanf(value
, "model\t\t: %u",
90 } else if (!strncmp(value
, "stepping\t: ", 10)) {
91 sscanf(value
, "stepping\t: %u",
94 /* Exit -> all values must have been set */
95 if (cpu_info
->vendor
== X86_VENDOR_UNKNOWN
||
96 cpu_info
->family
== unknown
||
97 cpu_info
->model
== unknown
||
98 cpu_info
->stepping
== unknown
) {
110 /* Get some useful CPU capabilities from cpuid */
111 if (cpu_info
->vendor
!= X86_VENDOR_AMD
&&
112 cpu_info
->vendor
!= X86_VENDOR_HYGON
&&
113 cpu_info
->vendor
!= X86_VENDOR_INTEL
)
116 cpuid_level
= cpuid_eax(0);
117 ext_cpuid_level
= cpuid_eax(0x80000000);
120 if (ext_cpuid_level
>= 0x80000007 &&
121 (cpuid_edx(0x80000007) & (1 << 8)))
122 cpu_info
->caps
|= CPUPOWER_CAP_INV_TSC
;
124 /* Aperf/Mperf registers support */
125 if (cpuid_level
>= 6 && (cpuid_ecx(6) & 0x1))
126 cpu_info
->caps
|= CPUPOWER_CAP_APERF
;
128 /* AMD or Hygon Boost state enable/disable register */
129 if (cpu_info
->vendor
== X86_VENDOR_AMD
||
130 cpu_info
->vendor
== X86_VENDOR_HYGON
) {
131 if (ext_cpuid_level
>= 0x80000007 &&
132 (cpuid_edx(0x80000007) & (1 << 9)))
133 cpu_info
->caps
|= CPUPOWER_CAP_AMD_CBP
;
135 if (ext_cpuid_level
>= 0x80000008 &&
136 cpuid_ebx(0x80000008) & (1 << 4))
137 cpu_info
->caps
|= CPUPOWER_CAP_AMD_RDPRU
;
140 if (cpu_info
->vendor
== X86_VENDOR_INTEL
) {
141 if (cpuid_level
>= 6 &&
142 (cpuid_eax(6) & (1 << 1)))
143 cpu_info
->caps
|= CPUPOWER_CAP_INTEL_IDA
;
146 if (cpu_info
->vendor
== X86_VENDOR_INTEL
) {
147 /* Intel's perf-bias MSR support */
148 if (cpuid_level
>= 6 && (cpuid_ecx(6) & (1 << 3)))
149 cpu_info
->caps
|= CPUPOWER_CAP_PERF_BIAS
;
151 /* Intel's Turbo Ratio Limit support */
152 if (cpu_info
->family
== 6) {
153 switch (cpu_info
->model
) {
154 case 0x1A: /* Core i7, Xeon 5500 series
155 * Bloomfield, Gainstown NHM-EP
157 case 0x1E: /* Core i7 and i5 Processor
158 * Clarksfield, Lynnfield, Jasper Forest
160 case 0x1F: /* Core i7 and i5 Processor - Nehalem */
161 case 0x25: /* Westmere Client
162 * Clarkdale, Arrandale
164 case 0x2C: /* Westmere EP - Gulftown */
165 cpu_info
->caps
|= CPUPOWER_CAP_HAS_TURBO_RATIO
;
168 case 0x2D: /* SNB Xeon */
170 case 0x3E: /* IVB Xeon */
171 cpu_info
->caps
|= CPUPOWER_CAP_HAS_TURBO_RATIO
;
172 cpu_info
->caps
|= CPUPOWER_CAP_IS_SNB
;
174 case 0x2E: /* Nehalem-EX Xeon - Beckton */
175 case 0x2F: /* Westmere-EX Xeon - Eagleton */
182 /* printf("ID: %u - Extid: 0x%x - Caps: 0x%llx\n",
183 cpuid_level, ext_cpuid_level, cpu_info->caps);