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 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 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 */ 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 } 128 129 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 }; 168 169 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 } 177 178 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 } 195 196 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