cpupowerutils - cpufrequtils extended with quite some features
[linux-2.6.git] / tools / power / cpupower / utils / helpers / amd.c
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
15 union 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
32 static 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
44 static 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
56         return ((100 * (fid + t)) >> did);
57  }
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  */
72 int 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;
77         unsigned long long val;
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;
98         for (i=0; i<=psmax; i++) {
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
112 int amd_pci_get_num_boost_states(int *active, int *states)
113 {
114         struct pci_access *pci_acc;
115         int vendor_id = 0x1022;
116         int boost_dev_ids[4] = {0x1204, 0x1604, 0x1704, 0};
117         struct pci_dev *device;
118         uint8_t val = 0;
119
120         *active = *states = 0;
121
122         device = pci_acc_init(&pci_acc, vendor_id, boost_dev_ids);
123
124         if (device == NULL)
125                 return -ENODEV;
126
127         val = pci_read_byte(device, 0x15c);
128         if (val & 3)
129                 *active = 1;
130         else
131                 *active = 0;
132         *states = (val >> 2) & 7;
133
134         pci_cleanup(pci_acc);
135         return 0;
136 }
137 #endif /* defined(__i386__) || defined(__x86_64__) */