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 
19 union 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 
get_did(union core_pstate pstate)47 static 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 
get_cof(union core_pstate pstate)61 static 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  */
decode_pstates(unsigned int cpu,int boost_states,unsigned long * pstates,int * no)92 int 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 
amd_pci_get_num_boost_states(int * active,int * states)129 int 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 ************************************/
156 enum 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 
163 static 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 
amd_pstate_get_data(unsigned int cpu,enum amd_pstate_value value)169 static 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 
amd_pstate_boost_init(unsigned int cpu,int * support,int * active)178 void 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 
amd_pstate_show_perf_and_freq(unsigned int cpu,int no_rounding)196 void 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__) */
227