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1// SPDX-License-Identifier: GPL-2.0
2#if defined(__i386__) || defined(__x86_64__)
3#include <unistd.h>
4#include <errno.h>
5#include <stdio.h>
6#include <stdint.h>
7
8#include <pci/pci.h>
9
10#include "helpers/helpers.h"
11#include "cpufreq.h"
12#include "acpi_cppc.h"
13
14/* ACPI P-States Helper Functions for AMD Processors ***************/
15#define MSR_AMD_PSTATE_STATUS 0xc0010063
16#define MSR_AMD_PSTATE 0xc0010064
17#define MSR_AMD_PSTATE_LIMIT 0xc0010061
18
19union core_pstate {
20 /* pre fam 17h: */
21 struct {
22 unsigned fid:6;
23 unsigned did:3;
24 unsigned vid:7;
25 unsigned res1:6;
26 unsigned nbdid:1;
27 unsigned res2:2;
28 unsigned nbvid:7;
29 unsigned iddval:8;
30 unsigned idddiv:2;
31 unsigned res3:21;
32 unsigned en:1;
33 } pstate;
34 /* since fam 17h: */
35 struct {
36 unsigned fid:8;
37 unsigned did:6;
38 unsigned vid:8;
39 unsigned iddval:8;
40 unsigned idddiv:2;
41 unsigned res1:31;
42 unsigned en:1;
43 } pstatedef;
44 unsigned long long val;
45};
46
47static int get_did(union core_pstate pstate)
48{
49 int t;
50
51 if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF)
52 t = pstate.pstatedef.did;
53 else if (cpupower_cpu_info.family == 0x12)
54 t = pstate.val & 0xf;
55 else
56 t = pstate.pstate.did;
57
58 return t;
59}
60
61static int get_cof(union core_pstate pstate)
62{
63 int t;
64 int fid, did, cof;
65
66 did = get_did(pstate);
67 if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF) {
68 fid = pstate.pstatedef.fid;
69 cof = 200 * fid / did;
70 } else {
71 t = 0x10;
72 fid = pstate.pstate.fid;
73 if (cpupower_cpu_info.family == 0x11)
74 t = 0x8;
75 cof = (100 * (fid + t)) >> did;
76 }
77 return cof;
78}
79
80/* Needs:
81 * cpu -> the cpu that gets evaluated
82 * boost_states -> how much boost states the machines support
83 *
84 * Fills up:
85 * pstates -> a pointer to an array of size MAX_HW_PSTATES
86 * must be initialized with zeros.
87 * All available HW pstates (including boost states)
88 * no -> amount of pstates above array got filled up with
89 *
90 * returns zero on success, -1 on failure
91 */
92int decode_pstates(unsigned int cpu, int boost_states,
93 unsigned long *pstates, int *no)
94{
95 int i, psmax;
96 union core_pstate pstate;
97 unsigned long long val;
98
99 /* Only read out frequencies from HW if HW Pstate is supported,
100 * otherwise frequencies are exported via ACPI tables.
101 */
102 if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_HW_PSTATE))
103 return -1;
104
105 if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val))
106 return -1;
107
108 psmax = (val >> 4) & 0x7;
109 psmax += boost_states;
110 for (i = 0; i <= psmax; i++) {
111 if (i >= MAX_HW_PSTATES) {
112 fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n",
113 psmax, MAX_HW_PSTATES);
114 return -1;
115 }
116 if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val))
117 return -1;
118
119 /* The enabled bit (bit 63) is common for all families */
120 if (!pstate.pstatedef.en)
121 continue;
122
123 pstates[i] = get_cof(pstate);
124 }
125 *no = i;
126 return 0;
127}
128
129int amd_pci_get_num_boost_states(int *active, int *states)
130{
131 struct pci_access *pci_acc;
132 struct pci_dev *device;
133 uint8_t val = 0;
134
135 *active = *states = 0;
136
137 device = pci_slot_func_init(&pci_acc, 0x18, 4);
138
139 if (device == NULL)
140 return -ENODEV;
141
142 val = pci_read_byte(device, 0x15c);
143 if (val & 3)
144 *active = 1;
145 else
146 *active = 0;
147 *states = (val >> 2) & 7;
148
149 pci_cleanup(pci_acc);
150 return 0;
151}
152
153/* ACPI P-States Helper Functions for AMD Processors ***************/
154
155/* AMD P-State Helper Functions ************************************/
156enum amd_pstate_value {
157 AMD_PSTATE_HIGHEST_PERF,
158 AMD_PSTATE_MAX_FREQ,
159 AMD_PSTATE_LOWEST_NONLINEAR_FREQ,
160 MAX_AMD_PSTATE_VALUE_READ_FILES,
161};
162
163static const char *amd_pstate_value_files[MAX_AMD_PSTATE_VALUE_READ_FILES] = {
164 [AMD_PSTATE_HIGHEST_PERF] = "amd_pstate_highest_perf",
165 [AMD_PSTATE_MAX_FREQ] = "amd_pstate_max_freq",
166 [AMD_PSTATE_LOWEST_NONLINEAR_FREQ] = "amd_pstate_lowest_nonlinear_freq",
167};
168
169static unsigned long amd_pstate_get_data(unsigned int cpu,
170 enum amd_pstate_value value)
171{
172 return cpufreq_get_sysfs_value_from_table(cpu,
173 amd_pstate_value_files,
174 value,
175 MAX_AMD_PSTATE_VALUE_READ_FILES);
176}
177
178void amd_pstate_boost_init(unsigned int cpu, int *support, int *active)
179{
180 unsigned long highest_perf, nominal_perf, cpuinfo_min,
181 cpuinfo_max, amd_pstate_max;
182
183 highest_perf = amd_pstate_get_data(cpu, AMD_PSTATE_HIGHEST_PERF);
184 nominal_perf = acpi_cppc_get_data(cpu, NOMINAL_PERF);
185
186 *support = highest_perf > nominal_perf ? 1 : 0;
187 if (!(*support))
188 return;
189
190 cpufreq_get_hardware_limits(cpu, &cpuinfo_min, &cpuinfo_max);
191 amd_pstate_max = amd_pstate_get_data(cpu, AMD_PSTATE_MAX_FREQ);
192
193 *active = cpuinfo_max == amd_pstate_max ? 1 : 0;
194}
195
196void amd_pstate_show_perf_and_freq(unsigned int cpu, int no_rounding)
197{
198 printf(_(" AMD PSTATE Highest Performance: %lu. Maximum Frequency: "),
199 amd_pstate_get_data(cpu, AMD_PSTATE_HIGHEST_PERF));
200 /*
201 * If boost isn't active, the cpuinfo_max doesn't indicate real max
202 * frequency. So we read it back from amd-pstate sysfs entry.
203 */
204 print_speed(amd_pstate_get_data(cpu, AMD_PSTATE_MAX_FREQ), no_rounding);
205 printf(".\n");
206
207 printf(_(" AMD PSTATE Nominal Performance: %lu. Nominal Frequency: "),
208 acpi_cppc_get_data(cpu, NOMINAL_PERF));
209 print_speed(acpi_cppc_get_data(cpu, NOMINAL_FREQ) * 1000,
210 no_rounding);
211 printf(".\n");
212
213 printf(_(" AMD PSTATE Lowest Non-linear Performance: %lu. Lowest Non-linear Frequency: "),
214 acpi_cppc_get_data(cpu, LOWEST_NONLINEAR_PERF));
215 print_speed(amd_pstate_get_data(cpu, AMD_PSTATE_LOWEST_NONLINEAR_FREQ),
216 no_rounding);
217 printf(".\n");
218
219 printf(_(" AMD PSTATE Lowest Performance: %lu. Lowest Frequency: "),
220 acpi_cppc_get_data(cpu, LOWEST_PERF));
221 print_speed(acpi_cppc_get_data(cpu, LOWEST_FREQ) * 1000, no_rounding);
222 printf(".\n");
223}
224
225/* AMD P-State Helper Functions ************************************/
226#endif /* defined(__i386__) || defined(__x86_64__) */