1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2017 Intel Corporation
*/
#include <fcntl.h>
#include <unistd.h>
#include <cpuid.h>
#include <rte_common.h>
#include "eal_private.h"
static unsigned int
rte_cpu_get_model(uint32_t fam_mod_step)
{
uint32_t family, model, ext_model;
family = (fam_mod_step >> 8) & 0xf;
model = (fam_mod_step >> 4) & 0xf;
if (family == 6 || family == 15) {
ext_model = (fam_mod_step >> 16) & 0xf;
model += (ext_model << 4);
}
return model;
}
static int32_t
rdmsr(int msr, uint64_t *val)
{
#ifdef RTE_EXEC_ENV_LINUXAPP
int fd;
int ret;
fd = open("/dev/cpu/0/msr", O_RDONLY);
if (fd < 0)
return fd;
ret = pread(fd, val, sizeof(uint64_t), msr);
close(fd);
return ret;
#else
RTE_SET_USED(msr);
RTE_SET_USED(val);
return -1;
#endif
}
static uint32_t
check_model_wsm_nhm(uint8_t model)
{
switch (model) {
/* Westmere */
case 0x25:
case 0x2C:
case 0x2F:
/* Nehalem */
case 0x1E:
case 0x1F:
case 0x1A:
case 0x2E:
return 1;
}
return 0;
}
static uint32_t
check_model_gdm_dnv(uint8_t model)
{
switch (model) {
/* Goldmont */
case 0x5C:
/* Denverton */
case 0x5F:
return 1;
}
return 0;
}
uint64_t
get_tsc_freq_arch(void)
{
uint64_t tsc_hz = 0;
uint32_t a, b, c, d, maxleaf;
uint8_t mult, model;
int32_t ret;
/*
* Time Stamp Counter and Nominal Core Crystal Clock
* Information Leaf
*/
maxleaf = __get_cpuid_max(0, NULL);
if (maxleaf >= 0x15) {
__cpuid(0x15, a, b, c, d);
/* EBX : TSC/Crystal ratio, ECX : Crystal Hz */
if (b && c)
return c * (b / a);
}
__cpuid(0x1, a, b, c, d);
model = rte_cpu_get_model(a);
if (check_model_wsm_nhm(model))
mult = 133;
else if ((c & bit_AVX) || check_model_gdm_dnv(model))
mult = 100;
else
return 0;
ret = rdmsr(0xCE, &tsc_hz);
if (ret < 0)
return 0;
return ((tsc_hz >> 8) & 0xff) * mult * 1E6;
}
|
