linux/include/acpi/processor.h
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   1#ifndef __ACPI_PROCESSOR_H
   2#define __ACPI_PROCESSOR_H
   3
   4#include <linux/kernel.h>
   5#include <linux/cpu.h>
   6#include <linux/thermal.h>
   7#include <asm/acpi.h>
   8
   9#define ACPI_PROCESSOR_BUSY_METRIC      10
  10
  11#define ACPI_PROCESSOR_MAX_POWER        8
  12#define ACPI_PROCESSOR_MAX_C2_LATENCY   100
  13#define ACPI_PROCESSOR_MAX_C3_LATENCY   1000
  14
  15#define ACPI_PROCESSOR_MAX_THROTTLING   16
  16#define ACPI_PROCESSOR_MAX_THROTTLE     250     /* 25% */
  17#define ACPI_PROCESSOR_MAX_DUTY_WIDTH   4
  18
  19#define ACPI_PDC_REVISION_ID            0x1
  20
  21#define ACPI_PSD_REV0_REVISION          0       /* Support for _PSD as in ACPI 3.0 */
  22#define ACPI_PSD_REV0_ENTRIES           5
  23
  24#define ACPI_TSD_REV0_REVISION          0       /* Support for _PSD as in ACPI 3.0 */
  25#define ACPI_TSD_REV0_ENTRIES           5
  26/*
  27 * Types of coordination defined in ACPI 3.0. Same macros can be used across
  28 * P, C and T states
  29 */
  30#define DOMAIN_COORD_TYPE_SW_ALL        0xfc
  31#define DOMAIN_COORD_TYPE_SW_ANY        0xfd
  32#define DOMAIN_COORD_TYPE_HW_ALL        0xfe
  33
  34#define ACPI_CSTATE_SYSTEMIO    0
  35#define ACPI_CSTATE_FFH         1
  36#define ACPI_CSTATE_HALT        2
  37
  38#define ACPI_CX_DESC_LEN        32
  39
  40/* Power Management */
  41
  42struct acpi_processor_cx;
  43
  44struct acpi_power_register {
  45        u8 descriptor;
  46        u16 length;
  47        u8 space_id;
  48        u8 bit_width;
  49        u8 bit_offset;
  50        u8 access_size;
  51        u64 address;
  52} __attribute__ ((packed));
  53
  54struct acpi_processor_cx {
  55        u8 valid;
  56        u8 type;
  57        u32 address;
  58        u8 entry_method;
  59        u8 index;
  60        u32 latency;
  61        u8 bm_sts_skip;
  62        char desc[ACPI_CX_DESC_LEN];
  63};
  64
  65struct acpi_processor_power {
  66        struct acpi_processor_cx *state;
  67        unsigned long bm_check_timestamp;
  68        u32 default_state;
  69        int count;
  70        struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
  71        int timer_broadcast_on_state;
  72};
  73
  74/* Performance Management */
  75
  76struct acpi_psd_package {
  77        u64 num_entries;
  78        u64 revision;
  79        u64 domain;
  80        u64 coord_type;
  81        u64 num_processors;
  82} __attribute__ ((packed));
  83
  84struct acpi_pct_register {
  85        u8 descriptor;
  86        u16 length;
  87        u8 space_id;
  88        u8 bit_width;
  89        u8 bit_offset;
  90        u8 reserved;
  91        u64 address;
  92} __attribute__ ((packed));
  93
  94struct acpi_processor_px {
  95        u64 core_frequency;     /* megahertz */
  96        u64 power;      /* milliWatts */
  97        u64 transition_latency; /* microseconds */
  98        u64 bus_master_latency; /* microseconds */
  99        u64 control;    /* control value */
 100        u64 status;     /* success indicator */
 101};
 102
 103struct acpi_processor_performance {
 104        unsigned int state;
 105        unsigned int platform_limit;
 106        struct acpi_pct_register control_register;
 107        struct acpi_pct_register status_register;
 108        unsigned int state_count;
 109        struct acpi_processor_px *states;
 110        struct acpi_psd_package domain_info;
 111        cpumask_var_t shared_cpu_map;
 112        unsigned int shared_type;
 113};
 114
 115/* Throttling Control */
 116
 117struct acpi_tsd_package {
 118        u64 num_entries;
 119        u64 revision;
 120        u64 domain;
 121        u64 coord_type;
 122        u64 num_processors;
 123} __attribute__ ((packed));
 124
 125struct acpi_ptc_register {
 126        u8 descriptor;
 127        u16 length;
 128        u8 space_id;
 129        u8 bit_width;
 130        u8 bit_offset;
 131        u8 reserved;
 132        u64 address;
 133} __attribute__ ((packed));
 134
 135struct acpi_processor_tx_tss {
 136        u64 freqpercentage;     /* */
 137        u64 power;      /* milliWatts */
 138        u64 transition_latency; /* microseconds */
 139        u64 control;    /* control value */
 140        u64 status;     /* success indicator */
 141};
 142struct acpi_processor_tx {
 143        u16 power;
 144        u16 performance;
 145};
 146
 147struct acpi_processor;
 148struct acpi_processor_throttling {
 149        unsigned int state;
 150        unsigned int platform_limit;
 151        struct acpi_pct_register control_register;
 152        struct acpi_pct_register status_register;
 153        unsigned int state_count;
 154        struct acpi_processor_tx_tss *states_tss;
 155        struct acpi_tsd_package domain_info;
 156        cpumask_var_t shared_cpu_map;
 157        int (*acpi_processor_get_throttling) (struct acpi_processor * pr);
 158        int (*acpi_processor_set_throttling) (struct acpi_processor * pr,
 159                                              int state, bool force);
 160
 161        u32 address;
 162        u8 duty_offset;
 163        u8 duty_width;
 164        u8 tsd_valid_flag;
 165        unsigned int shared_type;
 166        struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
 167};
 168
 169/* Limit Interface */
 170
 171struct acpi_processor_lx {
 172        int px;                 /* performance state */
 173        int tx;                 /* throttle level */
 174};
 175
 176struct acpi_processor_limit {
 177        struct acpi_processor_lx state; /* current limit */
 178        struct acpi_processor_lx thermal;       /* thermal limit */
 179        struct acpi_processor_lx user;  /* user limit */
 180};
 181
 182struct acpi_processor_flags {
 183        u8 power:1;
 184        u8 performance:1;
 185        u8 throttling:1;
 186        u8 limit:1;
 187        u8 bm_control:1;
 188        u8 bm_check:1;
 189        u8 has_cst:1;
 190        u8 power_setup_done:1;
 191        u8 bm_rld_set:1;
 192        u8 need_hotplug_init:1;
 193};
 194
 195struct acpi_processor {
 196        acpi_handle handle;
 197        u32 acpi_id;
 198        u32 id;
 199        u32 pblk;
 200        int performance_platform_limit;
 201        int throttling_platform_limit;
 202        /* 0 - states 0..n-th state available */
 203
 204        struct acpi_processor_flags flags;
 205        struct acpi_processor_power power;
 206        struct acpi_processor_performance *performance;
 207        struct acpi_processor_throttling throttling;
 208        struct acpi_processor_limit limit;
 209        struct thermal_cooling_device *cdev;
 210};
 211
 212struct acpi_processor_errata {
 213        u8 smp;
 214        struct {
 215                u8 throttle:1;
 216                u8 fdma:1;
 217                u8 reserved:6;
 218                u32 bmisx;
 219        } piix4;
 220};
 221
 222extern void acpi_processor_load_module(struct acpi_processor *pr);
 223extern int acpi_processor_preregister_performance(struct
 224                                                  acpi_processor_performance
 225                                                  __percpu *performance);
 226
 227extern int acpi_processor_register_performance(struct acpi_processor_performance
 228                                               *performance, unsigned int cpu);
 229extern void acpi_processor_unregister_performance(struct
 230                                                  acpi_processor_performance
 231                                                  *performance,
 232                                                  unsigned int cpu);
 233
 234/* note: this locks both the calling module and the processor module
 235         if a _PPC object exists, rmmod is disallowed then */
 236int acpi_processor_notify_smm(struct module *calling_module);
 237
 238/* for communication between multiple parts of the processor kernel module */
 239DECLARE_PER_CPU(struct acpi_processor *, processors);
 240extern struct acpi_processor_errata errata;
 241
 242#ifdef ARCH_HAS_POWER_INIT
 243void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
 244                                        unsigned int cpu);
 245int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 246                                    struct acpi_processor_cx *cx,
 247                                    struct acpi_power_register *reg);
 248void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
 249#else
 250static inline void acpi_processor_power_init_bm_check(struct
 251                                                      acpi_processor_flags
 252                                                      *flags, unsigned int cpu)
 253{
 254        flags->bm_check = 1;
 255        return;
 256}
 257static inline int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 258                                                  struct acpi_processor_cx *cx,
 259                                                  struct acpi_power_register
 260                                                  *reg)
 261{
 262        return -1;
 263}
 264static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
 265                                                   *cstate)
 266{
 267        return;
 268}
 269#endif
 270
 271/* in processor_perflib.c */
 272
 273#ifdef CONFIG_CPU_FREQ
 274void acpi_processor_ppc_init(void);
 275void acpi_processor_ppc_exit(void);
 276int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag);
 277extern int acpi_processor_get_bios_limit(int cpu, unsigned int *limit);
 278#else
 279static inline void acpi_processor_ppc_init(void)
 280{
 281        return;
 282}
 283static inline void acpi_processor_ppc_exit(void)
 284{
 285        return;
 286}
 287static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr,
 288                                                                int event_flag)
 289{
 290        static unsigned int printout = 1;
 291        if (printout) {
 292                printk(KERN_WARNING
 293                       "Warning: Processor Platform Limit event detected, but not handled.\n");
 294                printk(KERN_WARNING
 295                       "Consider compiling CPUfreq support into your kernel.\n");
 296                printout = 0;
 297        }
 298        return 0;
 299}
 300static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
 301{
 302        return -ENODEV;
 303}
 304
 305#endif                          /* CONFIG_CPU_FREQ */
 306
 307/* in processor_core.c */
 308void acpi_processor_set_pdc(acpi_handle handle);
 309int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
 310
 311/* in processor_throttling.c */
 312int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
 313int acpi_processor_get_throttling_info(struct acpi_processor *pr);
 314extern int acpi_processor_set_throttling(struct acpi_processor *pr,
 315                                         int state, bool force);
 316/*
 317 * Reevaluate whether the T-state is invalid after one cpu is
 318 * onlined/offlined. In such case the flags.throttling will be updated.
 319 */
 320extern void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
 321                        unsigned long action);
 322extern const struct file_operations acpi_processor_throttling_fops;
 323extern void acpi_processor_throttling_init(void);
 324/* in processor_idle.c */
 325int acpi_processor_power_init(struct acpi_processor *pr);
 326int acpi_processor_power_exit(struct acpi_processor *pr);
 327int acpi_processor_cst_has_changed(struct acpi_processor *pr);
 328int acpi_processor_hotplug(struct acpi_processor *pr);
 329int acpi_processor_suspend(struct device *dev);
 330int acpi_processor_resume(struct device *dev);
 331extern struct cpuidle_driver acpi_idle_driver;
 332
 333/* in processor_thermal.c */
 334int acpi_processor_get_limit_info(struct acpi_processor *pr);
 335extern const struct thermal_cooling_device_ops processor_cooling_ops;
 336#ifdef CONFIG_CPU_FREQ
 337void acpi_thermal_cpufreq_init(void);
 338void acpi_thermal_cpufreq_exit(void);
 339#else
 340static inline void acpi_thermal_cpufreq_init(void)
 341{
 342        return;
 343}
 344static inline void acpi_thermal_cpufreq_exit(void)
 345{
 346        return;
 347}
 348#endif
 349
 350#endif
 351
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