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
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
#if defined(__i386__) || defined(__x86_64__)
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <pci/pci.h>
#include "helpers/helpers.h"
#define MSR_AMD_PSTATE_STATUS 0xc0010063
#define MSR_AMD_PSTATE 0xc0010064
#define MSR_AMD_PSTATE_LIMIT 0xc0010061
union msr_pstate {
struct {
unsigned fid:6;
unsigned did:3;
unsigned vid:7;
unsigned res1:6;
unsigned nbdid:1;
unsigned res2:2;
unsigned nbvid:7;
unsigned iddval:8;
unsigned idddiv:2;
unsigned res3:21;
unsigned en:1;
} bits;
struct {
unsigned fid:8;
unsigned did:6;
unsigned vid:8;
unsigned iddval:8;
unsigned idddiv:2;
unsigned res1:30;
unsigned en:1;
} fam17h_bits;
unsigned long long val;
};
static int get_did(int family, union msr_pstate pstate)
{
int t;
if (family == 0x12)
t = pstate.val & 0xf;
else if (family == 0x17)
t = pstate.fam17h_bits.did;
else
t = pstate.bits.did;
return t;
}
static int get_cof(int family, union msr_pstate pstate)
{
int t;
int fid, did, cof;
did = get_did(family, pstate);
if (family == 0x17) {
fid = pstate.fam17h_bits.fid;
cof = 200 * fid / did;
} else {
t = 0x10;
fid = pstate.bits.fid;
if (family == 0x11)
t = 0x8;
cof = (100 * (fid + t)) >> did;
}
return cof;
}
/* Needs:
* cpu -> the cpu that gets evaluated
* cpu_family -> The cpu's family (0x10, 0x12,...)
* boots_states -> how much boost states the machines support
*
* Fills up:
* pstates -> a pointer to an array of size MAX_HW_PSTATES
* must be initialized with zeros.
* All available HW pstates (including boost states)
* no -> amount of pstates above array got filled up with
*
* returns zero on success, -1 on failure
*/
int decode_pstates(unsigned int cpu, unsigned int cpu_family,
int boost_states, unsigned long *pstates, int *no)
{
int i, psmax, pscur;
union msr_pstate pstate;
unsigned long long val;
/* Only read out frequencies from HW when CPU might be boostable
to keep the code as short and clean as possible.
Otherwise frequencies are exported via ACPI tables.
*/
if (cpu_family < 0x10 || cpu_family == 0x14)
return -1;
if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val))
return -1;
psmax = (val >> 4) & 0x7;
if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val))
return -1;
pscur = val & 0x7;
pscur += boost_states;
psmax += boost_states;
for (i = 0; i <= psmax; i++) {
if (i >= MAX_HW_PSTATES) {
fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n",
psmax, MAX_HW_PSTATES);
return -1;
}
if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val))
return -1;
pstates[i] = get_cof(cpu_family, pstate);
}
*no = i;
return 0;
}
int amd_pci_get_num_boost_states(int *active, int *states)
{
struct pci_access *pci_acc;
struct pci_dev *device;
uint8_t val = 0;
*active = *states = 0;
device = pci_slot_func_init(&pci_acc, 0x18, 4);
if (device == NULL)
return -ENODEV;
val = pci_read_byte(device, 0x15c);
if (val & 3)
*active = 1;
else
*active = 0;
*states = (val >> 2) & 7;
pci_cleanup(pci_acc);
return 0;
}
#endif /* defined(__i386__) || defined(__x86_64__) */
|
