include/acpi/processor.h

   1 #ifndef __ACPI_PROCESSOR_H
   2 #define __ACPI_PROCESSOR_H
   3
   4 #include <linux/kernel.h>
   5 #include <linux/cpu.h>
   6
   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 /*
  25  * Types of coordination defined in ACPI 3.0. Same macros can be used across
  26  * P, C and T states
  27  */
  28 #define DOMAIN_COORD_TYPE_SW_ALL        0xfc
  29 #define DOMAIN_COORD_TYPE_SW_ANY        0xfd
  30 #define DOMAIN_COORD_TYPE_HW_ALL        0xfe
  31
  32 #define ACPI_CSTATE_SYSTEMIO    (0)
  33 #define ACPI_CSTATE_FFH         (1)
  34
  35 /* Power Management */
  36
  37 struct acpi_processor_cx;
  38
  39 struct acpi_power_register {
  40         u8 descriptor;
  41         u16 length;
  42         u8 space_id;
  43         u8 bit_width;
  44         u8 bit_offset;
  45         u8 reserved;
  46         u64 address;
  47 } __attribute__ ((packed));
  48
  49 struct acpi_processor_cx_policy {
  50         u32 count;
  51         struct acpi_processor_cx *state;
  52         struct {
  53                 u32 time;
  54                 u32 ticks;
  55                 u32 count;
  56                 u32 bm;
  57         } threshold;
  58 };
  59
  60 struct acpi_processor_cx {
  61         u8 valid;
  62         u8 type;
  63         u32 address;
  64         u8 space_id;
  65         u8 index;
  66         u32 latency;
  67         u32 latency_ticks;
  68         u32 power;
  69         u32 usage;
  70         u64 time;
  71         struct acpi_processor_cx_policy promotion;
  72         struct acpi_processor_cx_policy demotion;
  73 };
  74
  75 struct acpi_processor_power {
  76         struct acpi_processor_cx *state;
  77         unsigned long bm_check_timestamp;
  78         u32 default_state;
  79         u32 bm_activity;
  80         int count;
  81         struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
  82 };
  83
  84 /* Performance Management */
  85
  86 struct acpi_psd_package {
  87         acpi_integer num_entries;
  88         acpi_integer revision;
  89         acpi_integer domain;
  90         acpi_integer coord_type;
  91         acpi_integer num_processors;
  92 } __attribute__ ((packed));
  93
  94 struct acpi_pct_register {
  95         u8 descriptor;
  96         u16 length;
  97         u8 space_id;
  98         u8 bit_width;
  99         u8 bit_offset;
 100         u8 reserved;
 101         u64 address;
 102 } __attribute__ ((packed));
 103
 104 struct acpi_processor_px {
 105         acpi_integer core_frequency;    /* megahertz */
 106         acpi_integer power;     /* milliWatts */
 107         acpi_integer transition_latency;        /* microseconds */
 108         acpi_integer bus_master_latency;        /* microseconds */
 109         acpi_integer control;   /* control value */
 110         acpi_integer status;    /* success indicator */
 111 };
 112
 113 struct acpi_processor_performance {
 114         unsigned int state;
 115         unsigned int platform_limit;
 116         struct acpi_pct_register control_register;
 117         struct acpi_pct_register status_register;
 118         unsigned int state_count;
 119         struct acpi_processor_px *states;
 120         struct acpi_psd_package domain_info;
 121         cpumask_t shared_cpu_map;
 122         unsigned int shared_type;
 123 };
 124
 125 /* Throttling Control */
 126
 127 struct acpi_processor_tx {
 128         u16 power;
 129         u16 performance;
 130 };
 131
 132 struct acpi_processor_throttling {
 133         int state;
 134         u32 address;
 135         u8 duty_offset;
 136         u8 duty_width;
 137         int state_count;
 138         struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
 139 };
 140
 141 /* Limit Interface */
 142
 143 struct acpi_processor_lx {
 144         int px;                 /* performace state */
 145         int tx;                 /* throttle level */
 146 };
 147
 148 struct acpi_processor_limit {
 149         struct acpi_processor_lx state; /* current limit */
 150         struct acpi_processor_lx thermal;       /* thermal limit */
 151         struct acpi_processor_lx user;  /* user limit */
 152 };
 153
 154 struct acpi_processor_flags {
 155         u8 power:1;
 156         u8 performance:1;
 157         u8 throttling:1;
 158         u8 limit:1;
 159         u8 bm_control:1;
 160         u8 bm_check:1;
 161         u8 has_cst:1;
 162         u8 power_setup_done:1;
 163 };
 164
 165 struct acpi_processor {
 166         acpi_handle handle;
 167         u32 acpi_id;
 168         u32 id;
 169         u32 pblk;
 170         int performance_platform_limit;
 171         struct acpi_processor_flags flags;
 172         struct acpi_processor_power power;
 173         struct acpi_processor_performance *performance;
 174         struct acpi_processor_throttling throttling;
 175         struct acpi_processor_limit limit;
 176
 177         /* the _PDC objects for this processor, if any */
 178         struct acpi_object_list *pdc;
 179 };
 180
 181 struct acpi_processor_errata {
 182         u8 smp;
 183         struct {
 184                 u8 throttle:1;
 185                 u8 fdma:1;
 186                 u8 reserved:6;
 187                 u32 bmisx;
 188         } piix4;
 189 };
 190
 191 extern int acpi_processor_preregister_performance(
 192                 struct acpi_processor_performance **performance);
 193
 194 extern int acpi_processor_register_performance(struct acpi_processor_performance
 195                                                *performance, unsigned int cpu);
 196 extern void acpi_processor_unregister_performance(struct
 197                                                   acpi_processor_performance
 198                                                   *performance,
 199                                                   unsigned int cpu);
 200
 201 /* note: this locks both the calling module and the processor module
 202          if a _PPC object exists, rmmod is disallowed then */
 203 int acpi_processor_notify_smm(struct module *calling_module);
 204
 205 /* for communication between multiple parts of the processor kernel module */
 206 extern struct acpi_processor *processors[NR_CPUS];
 207 extern struct acpi_processor_errata errata;
 208
 209 void arch_acpi_processor_init_pdc(struct acpi_processor *pr);
 210
 211 #ifdef ARCH_HAS_POWER_INIT
 212 void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
 213                                         unsigned int cpu);
 214 int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 215                 struct acpi_processor_cx *cx, struct acpi_power_register *reg);
 216 void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
 217 #else
 218 static inline void acpi_processor_power_init_bm_check(struct
 219                                                       acpi_processor_flags
 220                                                       *flags, unsigned int cpu)
 221 {
 222         flags->bm_check = 1;
 223         return;
 224 }
 225 static inline int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 226                 struct acpi_processor_cx *cx, struct acpi_power_register *reg)
 227 {
 228         return -1;
 229 }
 230 static inline void acpi_processor_ffh_cstate_enter(
 231                 struct acpi_processor_cx *cstate)
 232 {
 233         return;
 234 }
 235 #endif
 236
 237 /* in processor_perflib.c */
 238
 239 #ifdef CONFIG_CPU_FREQ
 240 void acpi_processor_ppc_init(void);
 241 void acpi_processor_ppc_exit(void);
 242 int acpi_processor_ppc_has_changed(struct acpi_processor *pr);
 243 #else
 244 static inline void acpi_processor_ppc_init(void)
 245 {
 246         return;
 247 }
 248 static inline void acpi_processor_ppc_exit(void)
 249 {
 250         return;
 251 }
 252 static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 253 {
 254         static unsigned int printout = 1;
 255         if (printout) {
 256                 printk(KERN_WARNING
 257                        "Warning: Processor Platform Limit event detected, but not handled.\n");
 258                 printk(KERN_WARNING
 259                        "Consider compiling CPUfreq support into your kernel.\n");
 260                 printout = 0;
 261         }
 262         return 0;
 263 }
 264 #endif                          /* CONFIG_CPU_FREQ */
 265
 266 /* in processor_throttling.c */
 267 int acpi_processor_get_throttling_info(struct acpi_processor *pr);
 268 int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
 269 extern struct file_operations acpi_processor_throttling_fops;
 270
 271 /* in processor_idle.c */
 272 int acpi_processor_power_init(struct acpi_processor *pr,
 273                               struct acpi_device *device);
 274 int acpi_processor_cst_has_changed(struct acpi_processor *pr);
 275 int acpi_processor_power_exit(struct acpi_processor *pr,
 276                               struct acpi_device *device);
 277
 278 /* in processor_thermal.c */
 279 int acpi_processor_get_limit_info(struct acpi_processor *pr);
 280 extern struct file_operations acpi_processor_limit_fops;
 281
 282 #ifdef CONFIG_CPU_FREQ
 283 void acpi_thermal_cpufreq_init(void);
 284 void acpi_thermal_cpufreq_exit(void);
 285 #else
 286 static inline void acpi_thermal_cpufreq_init(void)
 287 {
 288         return;
 289 }
 290 static inline void acpi_thermal_cpufreq_exit(void)
 291 {
 292         return;
 293 }
 294 #endif
 295
 296 #endif