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         int timer_broadcast_on_state;
  83 };
  84
  85 /* Performance Management */
  86
  87 struct acpi_psd_package {
  88         acpi_integer num_entries;
  89         acpi_integer revision;
  90         acpi_integer domain;
  91         acpi_integer coord_type;
  92         acpi_integer num_processors;
  93 } __attribute__ ((packed));
  94
  95 struct acpi_pct_register {
  96         u8 descriptor;
  97         u16 length;
  98         u8 space_id;
  99         u8 bit_width;
 100         u8 bit_offset;
 101         u8 reserved;
 102         u64 address;
 103 } __attribute__ ((packed));
 104
 105 struct acpi_processor_px {
 106         acpi_integer core_frequency;    /* megahertz */
 107         acpi_integer power;     /* milliWatts */
 108         acpi_integer transition_latency;        /* microseconds */
 109         acpi_integer bus_master_latency;        /* microseconds */
 110         acpi_integer control;   /* control value */
 111         acpi_integer status;    /* success indicator */
 112 };
 113
 114 struct acpi_processor_performance {
 115         unsigned int state;
 116         unsigned int platform_limit;
 117         struct acpi_pct_register control_register;
 118         struct acpi_pct_register status_register;
 119         unsigned int state_count;
 120         struct acpi_processor_px *states;
 121         struct acpi_psd_package domain_info;
 122         cpumask_t shared_cpu_map;
 123         unsigned int shared_type;
 124 };
 125
 126 /* Throttling Control */
 127
 128 struct acpi_processor_tx {
 129         u16 power;
 130         u16 performance;
 131 };
 132
 133 struct acpi_processor_throttling {
 134         int state;
 135         u32 address;
 136         u8 duty_offset;
 137         u8 duty_width;
 138         int state_count;
 139         struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
 140 };
 141
 142 /* Limit Interface */
 143
 144 struct acpi_processor_lx {
 145         int px;                 /* performace state */
 146         int tx;                 /* throttle level */
 147 };
 148
 149 struct acpi_processor_limit {
 150         struct acpi_processor_lx state; /* current limit */
 151         struct acpi_processor_lx thermal;       /* thermal limit */
 152         struct acpi_processor_lx user;  /* user limit */
 153 };
 154
 155 struct acpi_processor_flags {
 156         u8 power:1;
 157         u8 performance:1;
 158         u8 throttling:1;
 159         u8 limit:1;
 160         u8 bm_control:1;
 161         u8 bm_check:1;
 162         u8 has_cst:1;
 163         u8 power_setup_done:1;
 164 };
 165
 166 struct acpi_processor {
 167         acpi_handle handle;
 168         u32 acpi_id;
 169         u32 id;
 170         u32 pblk;
 171         int performance_platform_limit;
 172         struct acpi_processor_flags flags;
 173         struct acpi_processor_power power;
 174         struct acpi_processor_performance *performance;
 175         struct acpi_processor_throttling throttling;
 176         struct acpi_processor_limit limit;
 177
 178         /* the _PDC objects for this processor, if any */
 179         struct acpi_object_list *pdc;
 180 };
 181
 182 struct acpi_processor_errata {
 183         u8 smp;
 184         struct {
 185                 u8 throttle:1;
 186                 u8 fdma:1;
 187                 u8 reserved:6;
 188                 u32 bmisx;
 189         } piix4;
 190 };
 191
 192 extern int acpi_processor_preregister_performance(struct
 193                                                   acpi_processor_performance
 194                                                   **performance);
 195
 196 extern int acpi_processor_register_performance(struct acpi_processor_performance
 197                                                *performance, unsigned int cpu);
 198 extern void acpi_processor_unregister_performance(struct
 199                                                   acpi_processor_performance
 200                                                   *performance,
 201                                                   unsigned int cpu);
 202
 203 /* note: this locks both the calling module and the processor module
 204          if a _PPC object exists, rmmod is disallowed then */
 205 int acpi_processor_notify_smm(struct module *calling_module);
 206
 207 /* for communication between multiple parts of the processor kernel module */
 208 extern struct acpi_processor *processors[NR_CPUS];
 209 extern struct acpi_processor_errata errata;
 210
 211 void arch_acpi_processor_init_pdc(struct acpi_processor *pr);
 212
 213 #ifdef ARCH_HAS_POWER_INIT
 214 void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
 215                                         unsigned int cpu);
 216 int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 217                                     struct acpi_processor_cx *cx,
 218                                     struct acpi_power_register *reg);
 219 void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
 220 #else
 221 static inline void acpi_processor_power_init_bm_check(struct
 222                                                       acpi_processor_flags
 223                                                       *flags, unsigned int cpu)
 224 {
 225         flags->bm_check = 1;
 226         return;
 227 }
 228 static inline int acpi_processor_ffh_cstate_probe(unsigned int cpu,
 229                                                   struct acpi_processor_cx *cx,
 230                                                   struct acpi_power_register
 231                                                   *reg)
 232 {
 233         return -1;
 234 }
 235 static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
 236                                                    *cstate)
 237 {
 238         return;
 239 }
 240 #endif
 241
 242 /* in processor_perflib.c */
 243
 244 #ifdef CONFIG_CPU_FREQ
 245 void acpi_processor_ppc_init(void);
 246 void acpi_processor_ppc_exit(void);
 247 int acpi_processor_ppc_has_changed(struct acpi_processor *pr);
 248 #else
 249 static inline void acpi_processor_ppc_init(void)
 250 {
 251         return;
 252 }
 253 static inline void acpi_processor_ppc_exit(void)
 254 {
 255         return;
 256 }
 257 static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 258 {
 259         static unsigned int printout = 1;
 260         if (printout) {
 261                 printk(KERN_WARNING
 262                        "Warning: Processor Platform Limit event detected, but not handled.\n");
 263                 printk(KERN_WARNING
 264                        "Consider compiling CPUfreq support into your kernel.\n");
 265                 printout = 0;
 266         }
 267         return 0;
 268 }
 269 #endif                          /* CONFIG_CPU_FREQ */
 270
 271 /* in processor_throttling.c */
 272 int acpi_processor_get_throttling_info(struct acpi_processor *pr);
 273 int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
 274 extern struct file_operations acpi_processor_throttling_fops;
 275
 276 /* in processor_idle.c */
 277 int acpi_processor_power_init(struct acpi_processor *pr,
 278                               struct acpi_device *device);
 279 int acpi_processor_cst_has_changed(struct acpi_processor *pr);
 280 int acpi_processor_power_exit(struct acpi_processor *pr,
 281                               struct acpi_device *device);
 282
 283 /* in processor_thermal.c */
 284 int acpi_processor_get_limit_info(struct acpi_processor *pr);
 285 extern struct file_operations acpi_processor_limit_fops;
 286
 287 #ifdef CONFIG_CPU_FREQ
 288 void acpi_thermal_cpufreq_init(void);
 289 void acpi_thermal_cpufreq_exit(void);
 290 #else
 291 static inline void acpi_thermal_cpufreq_init(void)
 292 {
 293         return;
 294 }
 295 static inline void acpi_thermal_cpufreq_exit(void)
 296 {
 297         return;
 298 }
 299 #endif
 300
 301 #endif