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/cpuidle.h>
   7#include <linux/thermal.h>
   8#include <asm/acpi.h>
   9
  10#define ACPI_PROCESSOR_BUSY_METRIC      10
  11
  12#define ACPI_PROCESSOR_MAX_POWER        8
  13#define ACPI_PROCESSOR_MAX_C2_LATENCY   100
  14#define ACPI_PROCESSOR_MAX_C3_LATENCY   1000
  15
  16#define ACPI_PROCESSOR_MAX_THROTTLING   16
  17#define ACPI_PROCESSOR_MAX_THROTTLE     250     /* 25% */
  18#define ACPI_PROCESSOR_MAX_DUTY_WIDTH   4
  19
  20#define ACPI_PDC_REVISION_ID            0x1
  21
  22#define ACPI_PSD_REV0_REVISION          0       /* Support for _PSD as in ACPI 3.0 */
  23#define ACPI_PSD_REV0_ENTRIES           5
  24
  25#define ACPI_TSD_REV0_REVISION          0       /* Support for _PSD as in ACPI 3.0 */
  26#define ACPI_TSD_REV0_ENTRIES           5
  27/*
  28 * Types of coordination defined in ACPI 3.0. Same macros can be used across
  29 * P, C and T states
  30 */
  31#define DOMAIN_COORD_TYPE_SW_ALL        0xfc
  32#define DOMAIN_COORD_TYPE_SW_ANY        0xfd
  33#define DOMAIN_COORD_TYPE_HW_ALL        0xfe
  34
  35#define ACPI_CSTATE_SYSTEMIO    0
  36#define ACPI_CSTATE_FFH         1
  37#define ACPI_CSTATE_HALT        2
  38
  39#define ACPI_CX_DESC_LEN        32
  40
  41/* Power Management */
  42
  43struct acpi_processor_cx;
  44
  45struct acpi_power_register {
  46        u8 descriptor;
  47        u16 length;
  48        u8 space_id;
  49        u8 bit_width;
  50        u8 bit_offset;
  51        u8 reserved;
  52        u64 address;
  53} __attribute__ ((packed));
  54
  55struct acpi_processor_cx_policy {
  56        u32 count;
  57        struct acpi_processor_cx *state;
  58        struct {
  59                u32 time;
  60                u32 ticks;
  61                u32 count;
  62                u32 bm;
  63        } threshold;
  64};
  65
  66struct acpi_processor_cx {
  67        u8 valid;
  68        u8 type;
  69        u32 address;
  70        u8 entry_method;
  71        u8 index;
  72        u32 latency;
  73        u32 latency_ticks;
  74        u32 power;
  75        u32 usage;
  76        u64 time;
  77        struct acpi_processor_cx_policy promotion;
  78        struct acpi_processor_cx_policy demotion;
  79        char desc[ACPI_CX_DESC_LEN];
  80};
  81
  82struct acpi_processor_power {
  83        struct cpuidle_device dev;
  84        struct acpi_processor_cx *state;
  85        unsigned long bm_check_timestamp;
  86        u32 default_state;
  87        u32 bm_activity;
  88        int count;
  89        struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
  90        int timer_broadcast_on_state;
  91};
  92
  93/* Performance Management */
  94
  95struct acpi_psd_package {
  96        acpi_integer num_entries;
  97        acpi_integer revision;
  98        acpi_integer domain;
  99        acpi_integer coord_type;
 100        acpi_integer num_processors;
 101} __attribute__ ((packed));
 102
 103struct acpi_pct_register {
 104        u8 descriptor;
 105        u16 length;
 106        u8 space_id;
 107        u8 bit_width;
 108        u8 bit_offset;
 109        u8 reserved;
 110        u64 address;
 111} __attribute__ ((packed));
 112
 113struct acpi_processor_px {
 114        acpi_integer core_frequency;    /* megahertz */
 115        acpi_integer power;     /* milliWatts */
 116        acpi_integer transition_latency;        /* microseconds */
 117        acpi_integer bus_master_latency;        /* microseconds */
 118        acpi_integer control;   /* control value */
 119        acpi_integer status;    /* success indicator */
 120};
 121
 122struct acpi_processor_performance {
 123        unsigned int state;
 124        unsigned int platform_limit;
 125        struct acpi_pct_register control_register;
 126        struct acpi_pct_register status_register;
 127        unsigned int state_count;
 128        struct acpi_processor_px *states;
 129        struct acpi_psd_package domain_info;
 130        cpumask_t shared_cpu_map;
 131        unsigned int shared_type;
 132};
 133
 134/* Throttling Control */
 135
 136struct acpi_tsd_package {
 137        acpi_integer num_entries;
 138        acpi_integer revision;
 139        acpi_integer domain;
 140        acpi_integer coord_type;
 141        acpi_integer num_processors;
 142} __attribute__ ((packed));
 143
 144struct acpi_ptc_register {
 145        u8 descriptor;
 146        u16 length;
 147        u8 space_id;
 148        u8 bit_width;
 149        u8 bit_offset;
 150        u8 reserved;
 151        u64 address;
 152} __attribute__ ((packed));
 153
 154struct acpi_processor_tx_tss {
 155        acpi_integer freqpercentage;    /* */
 156        acpi_integer power;     /* milliWatts */
 157        acpi_integer transition_latency;        /* microseconds */
 158        acpi_integer control;   /* control value */
 159        acpi_integer status;    /* success indicator */
 160};
 161struct acpi_processor_tx {
 162        u16 power;
 163        u16 performance;
 164};
 165
 166struct acpi_processor;
 167struct acpi_processor_throttling {
 168        unsigned int state;
 169        unsigned int platform_limit;
 170        struct acpi_pct_register control_register;
 171        struct acpi_pct_register status_register;
 172        unsigned int state_count;
 173        struct acpi_processor_tx_tss *states_tss;
 174        struct acpi_tsd_package domain_info;
 175        cpumask_t shared_cpu_map;
 176        int (*acpi_processor_get_throttling) (struct acpi_processor * pr);
 177        int (*acpi_processor_set_throttling) (struct acpi_processor * pr,
 178                                              int state);
 179
 180        u32 address;
 181        u8 duty_offset;
 182        u8 duty_width;
 183        u8 tsd_valid_flag;
 184        unsigned int shared_type;
 185        struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
 186};
 187
 188/* Limit Interface */
 189
 190struct acpi_processor_lx {
 191        int px;                 /* performance state */
 192        int tx;                 /* throttle level */
 193};
 194
 195struct acpi_processor_limit {
 196        struct acpi_processor_lx state; /* current limit */
 197        struct acpi_processor_lx thermal;       /* thermal limit */
 198        struct acpi_processor_lx user;  /* user limit */
 199};
 200
 201struct acpi_processor_flags {
 202        u8 power:1;
 203        u8 performance:1;
 204        u8 throttling:1;
 205        u8 limit:1;
 206        u8 bm_control:1;
 207        u8 bm_check:1;
 208        u8 has_cst:1;
 209        u8 power_setup_done:1;
 210        u8 bm_rld_set:1;
 211};
 212
 213struct acpi_processor {
 214        acpi_handle handle;
 215        u32 acpi_id;
 216        u32 id;
 217        u32 pblk;
 218        int performance_platform_limit;
 219        int throttling_platform_limit;
 220        /* 0 - states 0..n-th state available */
 221
 222        struct acpi_processor_flags flags;
 223        struct acpi_processor_power power;
 224        struct acpi_processor_performance *performance;
 225        struct acpi_processor_throttling throttling;
 226        struct acpi_processor_limit limit;
 227        struct thermal_cooling_device *cdev;
 228        /* the _PDC objects for this processor, if any */
 229        struct acpi_object_list *pdc;
 230};
 231
 232struct acpi_processor_errata {
 233        u8 smp;
 234        struct {
 235                u8 throttle:1;
 236                u8 fdma:1;
 237                u8 reserved:6;
 238                u32 bmisx;
 239        } piix4;
 240};
 241
 242extern int acpi_processor_preregister_performance(struct
 243                                                  acpi_processor_performance
 244                                                  *performance);
 245
 246extern int acpi_processor_register_performance(struct acpi_processor_performance
 247                                               *performance, unsigned int cpu);
 248extern void acpi_processor_unregister_performance(struct
 249                                                  acpi_processor_performance
 250                                                  *performance,
 251                                                  unsigned int cpu);
 252
 253/* note: this locks both the calling module and the processor module
 254         if a _PPC object exists, rmmod is disallowed then */
 255int acpi_processor_notify_smm(struct module *calling_module);
 256
 257/* for communication between multiple parts of the processor kernel module */
 258DECLARE_PER_CPU(struct acpi_processor *, processors);
 259extern struct acpi_processor_errata errata;
 260
 261void arch_acpi_processor_init_pdc(struct acpi_processor *pr);
 262
 263#ifdef ARCH_HAS_POWER_INIT
 264void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
 265                                        unsigned int cpu);
 266int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 267                                    struct acpi_processor_cx *cx,
 268                                    struct acpi_power_register *reg);
 269void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
 270#else
 271static inline void acpi_processor_power_init_bm_check(struct
 272                                                      acpi_processor_flags
 273                                                      *flags, unsigned int cpu)
 274{
 275        flags->bm_check = 1;
 276        return;
 277}
 278static inline int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 279                                                  struct acpi_processor_cx *cx,
 280                                                  struct acpi_power_register
 281                                                  *reg)
 282{
 283        return -1;
 284}
 285static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
 286                                                   *cstate)
 287{
 288        return;
 289}
 290#endif
 291
 292/* in processor_perflib.c */
 293
 294#ifdef CONFIG_CPU_FREQ
 295void acpi_processor_ppc_init(void);
 296void acpi_processor_ppc_exit(void);
 297int acpi_processor_ppc_has_changed(struct acpi_processor *pr);
 298#else
 299static inline void acpi_processor_ppc_init(void)
 300{
 301        return;
 302}
 303static inline void acpi_processor_ppc_exit(void)
 304{
 305        return;
 306}
 307static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 308{
 309        static unsigned int printout = 1;
 310        if (printout) {
 311                printk(KERN_WARNING
 312                       "Warning: Processor Platform Limit event detected, but not handled.\n");
 313                printk(KERN_WARNING
 314                       "Consider compiling CPUfreq support into your kernel.\n");
 315                printout = 0;
 316        }
 317        return 0;
 318}
 319#endif                          /* CONFIG_CPU_FREQ */
 320
 321/* in processor_throttling.c */
 322int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
 323int acpi_processor_get_throttling_info(struct acpi_processor *pr);
 324extern int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
 325extern struct file_operations acpi_processor_throttling_fops;
 326extern void acpi_processor_throttling_init(void);
 327/* in processor_idle.c */
 328int acpi_processor_power_init(struct acpi_processor *pr,
 329                              struct acpi_device *device);
 330int acpi_processor_cst_has_changed(struct acpi_processor *pr);
 331int acpi_processor_power_exit(struct acpi_processor *pr,
 332                              struct acpi_device *device);
 333int acpi_processor_suspend(struct acpi_device * device, pm_message_t state);
 334int acpi_processor_resume(struct acpi_device * device);
 335extern struct cpuidle_driver acpi_idle_driver;
 336
 337/* in processor_thermal.c */
 338int acpi_processor_get_limit_info(struct acpi_processor *pr);
 339extern struct file_operations acpi_processor_limit_fops;
 340extern struct thermal_cooling_device_ops processor_cooling_ops;
 341#ifdef CONFIG_CPU_FREQ
 342void acpi_thermal_cpufreq_init(void);
 343void acpi_thermal_cpufreq_exit(void);
 344#else
 345static inline void acpi_thermal_cpufreq_init(void)
 346{
 347        return;
 348}
 349static inline void acpi_thermal_cpufreq_exit(void)
 350{
 351        return;
 352}
 353#endif
 354
 355#endif
 356
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