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