1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 /* 25 * Copyright (c) 2009, Intel Corporation. 26 * All Rights Reserved. 27 */ 28 29 #include <sys/x86_archext.h> 30 #include <sys/machsystm.h> 31 #include <sys/archsystm.h> 32 #include <sys/x_call.h> 33 #include <sys/acpi/acpi.h> 34 #include <sys/acpica.h> 35 #include <sys/speedstep.h> 36 #include <sys/cpu_acpi.h> 37 #include <sys/cpupm.h> 38 #include <sys/dtrace.h> 39 #include <sys/sdt.h> 40 41 static int speedstep_init(cpu_t *); 42 static void speedstep_fini(cpu_t *); 43 static void speedstep_power(cpuset_t, uint32_t); 44 static void speedstep_stop(cpu_t *); 45 static boolean_t speedstep_turbo_supported(void); 46 47 /* 48 * Interfaces for modules implementing Intel's Enhanced SpeedStep. 49 */ 50 cpupm_state_ops_t speedstep_ops = { 51 "Enhanced SpeedStep Technology", 52 speedstep_init, 53 speedstep_fini, 54 speedstep_power, 55 speedstep_stop 56 }; 57 58 /* 59 * Error returns 60 */ 61 #define ESS_RET_SUCCESS 0x00 62 #define ESS_RET_NO_PM 0x01 63 #define ESS_RET_UNSUP_STATE 0x02 64 65 /* 66 * MSR registers for changing and reading processor power state. 67 */ 68 #define IA32_PERF_STAT_MSR 0x198 69 #define IA32_PERF_CTL_MSR 0x199 70 71 #define IA32_CPUID_TSC_CONSTANT 0xF30 72 #define IA32_MISC_ENABLE_MSR 0x1A0 73 #define IA32_MISC_ENABLE_EST (1<<16) 74 #define IA32_MISC_ENABLE_CXE (1<<25) 75 76 #define CPUID_TURBO_SUPPORT (1 << 1) 77 78 /* 79 * Debugging support 80 */ 81 #ifdef DEBUG 82 volatile int ess_debug = 0; 83 #define ESSDEBUG(arglist) if (ess_debug) printf arglist; 84 #else 85 #define ESSDEBUG(arglist) 86 #endif 87 88 /* 89 * Write the ctrl register. How it is written, depends upon the _PCT 90 * APCI object value. 91 */ 92 static void 93 write_ctrl(cpu_acpi_handle_t handle, uint32_t ctrl) 94 { 95 cpu_acpi_pct_t *pct_ctrl; 96 uint64_t reg; 97 98 pct_ctrl = CPU_ACPI_PCT_CTRL(handle); 99 100 switch (pct_ctrl->cr_addrspace_id) { 101 case ACPI_ADR_SPACE_FIXED_HARDWARE: 102 /* 103 * Read current power state because reserved bits must be 104 * preserved, compose new value, and write it. 105 */ 106 reg = rdmsr(IA32_PERF_CTL_MSR); 107 reg &= ~((uint64_t)0xFFFF); 108 reg |= ctrl; 109 wrmsr(IA32_PERF_CTL_MSR, reg); 110 break; 111 112 case ACPI_ADR_SPACE_SYSTEM_IO: 113 (void) cpu_acpi_write_port(pct_ctrl->cr_address, ctrl, 114 pct_ctrl->cr_width); 115 break; 116 117 default: 118 DTRACE_PROBE1(ess_ctrl_unsupported_type, uint8_t, 119 pct_ctrl->cr_addrspace_id); 120 return; 121 } 122 123 DTRACE_PROBE1(ess_ctrl_write, uint32_t, ctrl); 124 } 125 126 /* 127 * Transition the current processor to the requested state. 128 */ 129 void 130 speedstep_pstate_transition(uint32_t req_state) 131 { 132 cpupm_mach_state_t *mach_state = 133 (cpupm_mach_state_t *)CPU->cpu_m.mcpu_pm_mach_state; 134 cpu_acpi_handle_t handle = mach_state->ms_acpi_handle; 135 cpu_acpi_pstate_t *req_pstate; 136 uint32_t ctrl; 137 138 req_pstate = (cpu_acpi_pstate_t *)CPU_ACPI_PSTATES(handle); 139 req_pstate += req_state; 140 141 DTRACE_PROBE1(ess_transition, uint32_t, CPU_ACPI_FREQ(req_pstate)); 142 143 /* 144 * Initiate the processor p-state change. 145 */ 146 ctrl = CPU_ACPI_PSTATE_CTRL(req_pstate); 147 write_ctrl(handle, ctrl); 148 149 if (mach_state->ms_turbo != NULL) 150 cpupm_record_turbo_info(mach_state->ms_turbo, 151 mach_state->ms_pstate.cma_state.pstate, req_state); 152 153 mach_state->ms_pstate.cma_state.pstate = req_state; 154 cpu_set_curr_clock(((uint64_t)CPU_ACPI_FREQ(req_pstate) * 1000000)); 155 } 156 157 static void 158 speedstep_power(cpuset_t set, uint32_t req_state) 159 { 160 /* 161 * If thread is already running on target CPU then just 162 * make the transition request. Otherwise, we'll need to 163 * make a cross-call. 164 */ 165 kpreempt_disable(); 166 if (CPU_IN_SET(set, CPU->cpu_id)) { 167 speedstep_pstate_transition(req_state); 168 CPUSET_DEL(set, CPU->cpu_id); 169 } 170 if (!CPUSET_ISNULL(set)) { 171 xc_call((xc_arg_t)req_state, 0, 0, CPUSET2BV(set), 172 (xc_func_t)speedstep_pstate_transition); 173 } 174 kpreempt_enable(); 175 } 176 177 /* 178 * Validate that this processor supports Speedstep and if so, 179 * get the P-state data from ACPI and cache it. 180 */ 181 static int 182 speedstep_init(cpu_t *cp) 183 { 184 cpupm_mach_state_t *mach_state = 185 (cpupm_mach_state_t *)cp->cpu_m.mcpu_pm_mach_state; 186 cpu_acpi_handle_t handle = mach_state->ms_acpi_handle; 187 cpu_acpi_pct_t *pct_stat; 188 static int logged = 0; 189 190 ESSDEBUG(("speedstep_init: processor %d\n", cp->cpu_id)); 191 192 /* 193 * Cache the P-state specific ACPI data. 194 */ 195 if (cpu_acpi_cache_pstate_data(handle) != 0) { 196 if (!logged) { 197 cmn_err(CE_NOTE, "!SpeedStep support is being " 198 "disabled due to errors parsing ACPI P-state " 199 "objects exported by BIOS."); 200 logged = 1; 201 } 202 speedstep_fini(cp); 203 return (ESS_RET_NO_PM); 204 } 205 206 pct_stat = CPU_ACPI_PCT_STATUS(handle); 207 switch (pct_stat->cr_addrspace_id) { 208 case ACPI_ADR_SPACE_FIXED_HARDWARE: 209 ESSDEBUG(("Transitions will use fixed hardware\n")); 210 break; 211 case ACPI_ADR_SPACE_SYSTEM_IO: 212 ESSDEBUG(("Transitions will use system IO\n")); 213 break; 214 default: 215 cmn_err(CE_WARN, "!_PCT conifgured for unsupported " 216 "addrspace = %d.", pct_stat->cr_addrspace_id); 217 cmn_err(CE_NOTE, "!CPU power management will not function."); 218 speedstep_fini(cp); 219 return (ESS_RET_NO_PM); 220 } 221 222 cpupm_alloc_domains(cp, CPUPM_P_STATES); 223 224 if (speedstep_turbo_supported()) 225 mach_state->ms_turbo = cpupm_turbo_init(cp); 226 227 ESSDEBUG(("Processor %d succeeded.\n", cp->cpu_id)) 228 return (ESS_RET_SUCCESS); 229 } 230 231 /* 232 * Free resources allocated by speedstep_init(). 233 */ 234 static void 235 speedstep_fini(cpu_t *cp) 236 { 237 cpupm_mach_state_t *mach_state = 238 (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state); 239 cpu_acpi_handle_t handle = mach_state->ms_acpi_handle; 240 241 cpupm_free_domains(&cpupm_pstate_domains); 242 cpu_acpi_free_pstate_data(handle); 243 244 if (mach_state->ms_turbo != NULL) 245 cpupm_turbo_fini(mach_state->ms_turbo); 246 mach_state->ms_turbo = NULL; 247 } 248 249 static void 250 speedstep_stop(cpu_t *cp) 251 { 252 cpupm_mach_state_t *mach_state = 253 (cpupm_mach_state_t *)(cp->cpu_m.mcpu_pm_mach_state); 254 cpu_acpi_handle_t handle = mach_state->ms_acpi_handle; 255 256 cpupm_remove_domains(cp, CPUPM_P_STATES, &cpupm_pstate_domains); 257 cpu_acpi_free_pstate_data(handle); 258 259 if (mach_state->ms_turbo != NULL) 260 cpupm_turbo_fini(mach_state->ms_turbo); 261 mach_state->ms_turbo = NULL; 262 } 263 264 boolean_t 265 speedstep_supported(uint_t family, uint_t model) 266 { 267 struct cpuid_regs cpu_regs; 268 269 /* Required features */ 270 if (!is_x86_feature(x86_featureset, X86FSET_CPUID) || 271 !is_x86_feature(x86_featureset, X86FSET_MSR)) { 272 return (B_FALSE); 273 } 274 275 /* 276 * We only support family/model combinations which 277 * are P-state TSC invariant. 278 */ 279 if (!((family == 0xf && model >= 0x3) || 280 (family == 0x6 && model >= 0xe))) { 281 return (B_FALSE); 282 } 283 284 /* 285 * Enhanced SpeedStep supported? 286 */ 287 cpu_regs.cp_eax = 0x1; 288 (void) __cpuid_insn(&cpu_regs); 289 if (!(cpu_regs.cp_ecx & CPUID_INTC_ECX_EST)) { 290 return (B_FALSE); 291 } 292 293 return (B_TRUE); 294 } 295 296 boolean_t 297 speedstep_turbo_supported(void) 298 { 299 struct cpuid_regs cpu_regs; 300 301 /* Required features */ 302 if (!is_x86_feature(x86_featureset, X86FSET_CPUID) || 303 !is_x86_feature(x86_featureset, X86FSET_MSR)) { 304 return (B_FALSE); 305 } 306 307 /* 308 * turbo mode supported? 309 */ 310 cpu_regs.cp_eax = 0x6; 311 (void) __cpuid_insn(&cpu_regs); 312 if (!(cpu_regs.cp_eax & CPUID_TURBO_SUPPORT)) { 313 return (B_FALSE); 314 } 315 316 return (B_TRUE); 317 } 318