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 	struct pci_dev *device;
116 	uint8_t val = 0;
117 
118 	*active = *states = 0;
119 
120 	device = pci_slot_func_init(&pci_acc, 0x18, 4);
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__) */
136