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gerrit-public.fairphone.software / kernel / msm-5.4 / d6a624eef128c97b35fcea47cd00ef22f005e7aa / . / tools / power / cpupower / utils / helpers / amd.c
blob: 6437ef39aeea61fe592d11d5a022730a8b46a6dd [file] [log] [blame]
Dominik Brodowski7fe2f632011-03-30 16:30:11 +0200[diff] [blame]1#if defined(__i386__) || defined(__x86_64__)
2#include <unistd.h>
3#include <errno.h>
4#include <stdio.h>
5#include <stdint.h>
6
7#include <pci/pci.h>
8
9#include "helpers/helpers.h"
10
11#define MSR_AMD_PSTATE_STATUS 0xc0010063
12#define MSR_AMD_PSTATE 0xc0010064
13#define MSR_AMD_PSTATE_LIMIT 0xc0010061
14
15union msr_pstate {
16 struct {
17 unsigned fid:6;
18 unsigned did:3;
19 unsigned vid:7;
20 unsigned res1:6;
21 unsigned nbdid:1;
22 unsigned res2:2;
23 unsigned nbvid:7;
24 unsigned iddval:8;
25 unsigned idddiv:2;
26 unsigned res3:21;
27 unsigned en:1;
28 } bits;
29 unsigned long long val;
30};
31
32static int get_did(int family, union msr_pstate pstate)
33{
34 int t;
35
36 if (family == 0x12)
37 t = pstate.val & 0xf;
38 else
39 t = pstate.bits.did;
40
41 return t;
42}
43
44static int get_cof(int family, union msr_pstate pstate)
45{
46 int t;
47 int fid, did;
48
49 did = get_did(family, pstate);
50
51 t = 0x10;
52 fid = pstate.bits.fid;
53 if (family == 0x11)
54 t = 0x8;
55
Dominik Brodowski2cd005c2011-04-19 20:16:05 +0200[diff] [blame]56 return (100 * (fid + t)) >> did;
57}
Dominik Brodowski7fe2f632011-03-30 16:30:11 +0200[diff] [blame]58
59/* Needs:
60 * cpu -> the cpu that gets evaluated
61 * cpu_family -> The cpu's family (0x10, 0x12,...)
62 * boots_states -> how much boost states the machines support
63 *
64 * Fills up:
65 * pstates -> a pointer to an array of size MAX_HW_PSTATES
66 * must be initialized with zeros.
67 * All available HW pstates (including boost states)
68 * no -> amount of pstates above array got filled up with
69 *
70 * returns zero on success, -1 on failure
71 */
72int decode_pstates(unsigned int cpu, unsigned int cpu_family,
73 int boost_states, unsigned long *pstates, int *no)
74{
75 int i, psmax, pscur;
76 union msr_pstate pstate;
Dominik Brodowski2cd005c2011-04-19 20:16:05 +0200[diff] [blame]77 unsigned long long val;
Dominik Brodowski7fe2f632011-03-30 16:30:11 +0200[diff] [blame]78
79 /* Only read out frequencies from HW when CPU might be boostable
80 to keep the code as short and clean as possible.
81 Otherwise frequencies are exported via ACPI tables.
82 */
83 if (cpu_family < 0x10 || cpu_family == 0x14)
84 return -1;
85
86 if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val))
87 return -1;
88
89 psmax = (val >> 4) & 0x7;
90
91 if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val))
92 return -1;
93
94 pscur = val & 0x7;
95
96 pscur += boost_states;
97 psmax += boost_states;
Dominik Brodowski2cd005c2011-04-19 20:16:05 +0200[diff] [blame]98 for (i = 0; i <= psmax; i++) {
Dominik Brodowski7fe2f632011-03-30 16:30:11 +0200[diff] [blame]99 if (i >= MAX_HW_PSTATES) {
100 fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n",
101 psmax, MAX_HW_PSTATES);
102 return -1;
103 }
104 if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val))
105 return -1;
106 pstates[i] = get_cof(cpu_family, pstate);
107 }
108 *no = i;
109 return 0;
110}
111
112int amd_pci_get_num_boost_states(int *active, int *states)
113{
114 struct pci_access *pci_acc;
Dominik Brodowski7fe2f632011-03-30 16:30:11 +0200[diff] [blame]115 struct pci_dev *device;
116 uint8_t val = 0;
117
118 *active = *states = 0;
119
Thomas Renninger568a8992011-10-11 15:33:50 +0200[diff] [blame]120 device = pci_slot_func_init(&pci_acc, 0x18, 4);
Dominik Brodowski7fe2f632011-03-30 16:30:11 +0200[diff] [blame]121
122 if (device == NULL)
123 return -ENODEV;
124
125 val = pci_read_byte(device, 0x15c);
126 if (val & 3)
127 *active = 1;
128 else
129 *active = 0;
130 *states = (val >> 2) & 7;
131
132 pci_cleanup(pci_acc);
133 return 0;
134}
135#endif /* defined(__i386__) || defined(__x86_64__) */