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 /* since fam 1Ah: */ 45 struct { 46 unsigned fid:12; 47 unsigned res1:2; 48 unsigned vid:8; 49 unsigned iddval:8; 50 unsigned idddiv:2; 51 unsigned res2:31; 52 unsigned en:1; 53 } pstatedef2; 54 unsigned long long val; 55 }; 56 57 static int get_did(union core_pstate pstate) 58 { 59 int t; 60 61 /* Fam 1Ah onward do not use did */ 62 if (cpupower_cpu_info.family >= 0x1A) 63 return 0; 64 65 if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF) 66 t = pstate.pstatedef.did; 67 else if (cpupower_cpu_info.family == 0x12) 68 t = pstate.val & 0xf; 69 else 70 t = pstate.pstate.did; 71 72 return t; 73 } 74 75 static int get_cof(union core_pstate pstate) 76 { 77 int t; 78 int fid, did, cof = 0; 79 80 did = get_did(pstate); 81 if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATEDEF) { 82 if (cpupower_cpu_info.family >= 0x1A) { 83 fid = pstate.pstatedef2.fid; 84 if (fid > 0x0f) 85 cof = (fid * 5); 86 } else { 87 fid = pstate.pstatedef.fid; 88 cof = 200 * fid / did; 89 } 90 } else { 91 t = 0x10; 92 fid = pstate.pstate.fid; 93 if (cpupower_cpu_info.family == 0x11) 94 t = 0x8; 95 cof = (100 * (fid + t)) >> did; 96 } 97 return cof; 98 } 99 100 /* Needs: 101 * cpu -> the cpu that gets evaluated 102 * boost_states -> how much boost states the machines support 103 * 104 * Fills up: 105 * pstates -> a pointer to an array of size MAX_HW_PSTATES 106 * must be initialized with zeros. 107 * All available HW pstates (including boost states) 108 * no -> amount of pstates above array got filled up with 109 * 110 * returns zero on success, -1 on failure 111 */ 112 int decode_pstates(unsigned int cpu, int boost_states, 113 unsigned long *pstates, int *no) 114 { 115 int i, psmax; 116 union core_pstate pstate; 117 unsigned long long val; 118 119 /* Only read out frequencies from HW if HW Pstate is supported, 120 * otherwise frequencies are exported via ACPI tables. 121 */ 122 if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_HW_PSTATE)) 123 return -1; 124 125 if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val)) 126 return -1; 127 128 psmax = (val >> 4) & 0x7; 129 psmax += boost_states; 130 for (i = 0; i <= psmax; i++) { 131 if (i >= MAX_HW_PSTATES) { 132 fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n", 133 psmax, MAX_HW_PSTATES); 134 return -1; 135 } 136 if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val)) 137 return -1; 138 139 /* The enabled bit (bit 63) is common for all families */ 140 if (!pstate.pstatedef.en) 141 continue; 142 143 pstates[i] = get_cof(pstate); 144 } 145 *no = i; 146 return 0; 147 } 148 149 int amd_pci_get_num_boost_states(int *active, int *states) 150 { 151 struct pci_access *pci_acc; 152 struct pci_dev *device; 153 uint8_t val = 0; 154 155 *active = *states = 0; 156 157 device = pci_slot_func_init(&pci_acc, 0x18, 4); 158 159 if (device == NULL) 160 return -ENODEV; 161 162 val = pci_read_byte(device, 0x15c); 163 if (val & 3) 164 *active = 1; 165 else 166 *active = 0; 167 *states = (val >> 2) & 7; 168 169 pci_cleanup(pci_acc); 170 return 0; 171 } 172 173 /* ACPI P-States Helper Functions for AMD Processors ***************/ 174 175 /* AMD P-State Helper Functions ************************************/ 176 enum amd_pstate_value { 177 AMD_PSTATE_HIGHEST_PERF, 178 AMD_PSTATE_MAX_FREQ, 179 AMD_PSTATE_LOWEST_NONLINEAR_FREQ, 180 MAX_AMD_PSTATE_VALUE_READ_FILES, 181 }; 182 183 static const char *amd_pstate_value_files[MAX_AMD_PSTATE_VALUE_READ_FILES] = { 184 [AMD_PSTATE_HIGHEST_PERF] = "amd_pstate_highest_perf", 185 [AMD_PSTATE_MAX_FREQ] = "amd_pstate_max_freq", 186 [AMD_PSTATE_LOWEST_NONLINEAR_FREQ] = "amd_pstate_lowest_nonlinear_freq", 187 }; 188 189 static unsigned long amd_pstate_get_data(unsigned int cpu, 190 enum amd_pstate_value value) 191 { 192 return cpufreq_get_sysfs_value_from_table(cpu, 193 amd_pstate_value_files, 194 value, 195 MAX_AMD_PSTATE_VALUE_READ_FILES); 196 } 197 198 void amd_pstate_boost_init(unsigned int cpu, int *support, int *active) 199 { 200 unsigned long highest_perf, nominal_perf, cpuinfo_min, 201 cpuinfo_max, amd_pstate_max; 202 203 highest_perf = amd_pstate_get_data(cpu, AMD_PSTATE_HIGHEST_PERF); 204 nominal_perf = acpi_cppc_get_data(cpu, NOMINAL_PERF); 205 206 *support = highest_perf > nominal_perf ? 1 : 0; 207 if (!(*support)) 208 return; 209 210 cpufreq_get_hardware_limits(cpu, &cpuinfo_min, &cpuinfo_max); 211 amd_pstate_max = amd_pstate_get_data(cpu, AMD_PSTATE_MAX_FREQ); 212 213 *active = cpuinfo_max == amd_pstate_max ? 1 : 0; 214 } 215 216 void amd_pstate_show_perf_and_freq(unsigned int cpu, int no_rounding) 217 { 218 printf(_(" AMD PSTATE Highest Performance: %lu. Maximum Frequency: "), 219 amd_pstate_get_data(cpu, AMD_PSTATE_HIGHEST_PERF)); 220 /* 221 * If boost isn't active, the cpuinfo_max doesn't indicate real max 222 * frequency. So we read it back from amd-pstate sysfs entry. 223 */ 224 print_speed(amd_pstate_get_data(cpu, AMD_PSTATE_MAX_FREQ), no_rounding); 225 printf(".\n"); 226 227 printf(_(" AMD PSTATE Nominal Performance: %lu. Nominal Frequency: "), 228 acpi_cppc_get_data(cpu, NOMINAL_PERF)); 229 print_speed(acpi_cppc_get_data(cpu, NOMINAL_FREQ) * 1000, 230 no_rounding); 231 printf(".\n"); 232 233 printf(_(" AMD PSTATE Lowest Non-linear Performance: %lu. Lowest Non-linear Frequency: "), 234 acpi_cppc_get_data(cpu, LOWEST_NONLINEAR_PERF)); 235 print_speed(amd_pstate_get_data(cpu, AMD_PSTATE_LOWEST_NONLINEAR_FREQ), 236 no_rounding); 237 printf(".\n"); 238 239 printf(_(" AMD PSTATE Lowest Performance: %lu. Lowest Frequency: "), 240 acpi_cppc_get_data(cpu, LOWEST_PERF)); 241 print_speed(acpi_cppc_get_data(cpu, LOWEST_FREQ) * 1000, no_rounding); 242 printf(".\n"); 243 } 244 245 /* AMD P-State Helper Functions ************************************/ 246 #endif /* defined(__i386__) || defined(__x86_64__) */ 247