include/acpi/processor.h

   1 #ifndef __ACPI_PROCESSOR_H
   2 #define __ACPI_PROCESSOR_H
   3
   4 #include <linux/kernel.h>
   5
   6 #include <asm/acpi.h>
   7
   8 #define ACPI_PROCESSOR_BUSY_METRIC      10
   9
  10 #define ACPI_PROCESSOR_MAX_POWER        8
  11 #define ACPI_PROCESSOR_MAX_C2_LATENCY   100
  12 #define ACPI_PROCESSOR_MAX_C3_LATENCY   1000
  13
  14 #define ACPI_PROCESSOR_MAX_THROTTLING   16
  15 #define ACPI_PROCESSOR_MAX_THROTTLE     250     /* 25% */
  16 #define ACPI_PROCESSOR_MAX_DUTY_WIDTH   4
  17
  18 #define ACPI_PDC_REVISION_ID            0x1
  19
  20 /* Power Management */
  21
  22 struct acpi_processor_cx;
  23
  24 struct acpi_power_register {
  25         u8 descriptor;
  26         u16 length;
  27         u8 space_id;
  28         u8 bit_width;
  29         u8 bit_offset;
  30         u8 reserved;
  31         u64 address;
  32 } __attribute__ ((packed));
  33
  34 struct acpi_processor_cx_policy {
  35         u32 count;
  36         struct acpi_processor_cx *state;
  37         struct {
  38                 u32 time;
  39                 u32 ticks;
  40                 u32 count;
  41                 u32 bm;
  42         } threshold;
  43 };
  44
  45 struct acpi_processor_cx {
  46         u8 valid;
  47         u8 type;
  48         u32 address;
  49         u32 latency;
  50         u32 latency_ticks;
  51         u32 power;
  52         u32 usage;
  53         struct acpi_processor_cx_policy promotion;
  54         struct acpi_processor_cx_policy demotion;
  55 };
  56
  57 struct acpi_processor_power {
  58         struct acpi_processor_cx *state;
  59         unsigned long bm_check_timestamp;
  60         u32 default_state;
  61         u32 bm_activity;
  62         int count;
  63         struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
  64 };
  65
  66 /* Performance Management */
  67
  68 struct acpi_pct_register {
  69         u8 descriptor;
  70         u16 length;
  71         u8 space_id;
  72         u8 bit_width;
  73         u8 bit_offset;
  74         u8 reserved;
  75         u64 address;
  76 } __attribute__ ((packed));
  77
  78 struct acpi_processor_px {
  79         acpi_integer core_frequency;    /* megahertz */
  80         acpi_integer power;     /* milliWatts */
  81         acpi_integer transition_latency;        /* microseconds */
  82         acpi_integer bus_master_latency;        /* microseconds */
  83         acpi_integer control;   /* control value */
  84         acpi_integer status;    /* success indicator */
  85 };
  86
  87 struct acpi_processor_performance {
  88         unsigned int state;
  89         unsigned int platform_limit;
  90         struct acpi_pct_register control_register;
  91         struct acpi_pct_register status_register;
  92         unsigned int state_count;
  93         struct acpi_processor_px *states;
  94
  95 };
  96
  97 /* Throttling Control */
  98
  99 struct acpi_processor_tx {
 100         u16 power;
 101         u16 performance;
 102 };
 103
 104 struct acpi_processor_throttling {
 105         int state;
 106         u32 address;
 107         u8 duty_offset;
 108         u8 duty_width;
 109         int state_count;
 110         struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
 111 };
 112
 113 /* Limit Interface */
 114
 115 struct acpi_processor_lx {
 116         int px;                 /* performace state */
 117         int tx;                 /* throttle level */
 118 };
 119
 120 struct acpi_processor_limit {
 121         struct acpi_processor_lx state; /* current limit */
 122         struct acpi_processor_lx thermal;       /* thermal limit */
 123         struct acpi_processor_lx user;  /* user limit */
 124 };
 125
 126 struct acpi_processor_flags {
 127         u8 power:1;
 128         u8 performance:1;
 129         u8 throttling:1;
 130         u8 limit:1;
 131         u8 bm_control:1;
 132         u8 bm_check:1;
 133         u8 has_cst:1;
 134         u8 power_setup_done:1;
 135 };
 136
 137 struct acpi_processor {
 138         acpi_handle handle;
 139         u32 acpi_id;
 140         u32 id;
 141         u32 pblk;
 142         int performance_platform_limit;
 143         struct acpi_processor_flags flags;
 144         struct acpi_processor_power power;
 145         struct acpi_processor_performance *performance;
 146         struct acpi_processor_throttling throttling;
 147         struct acpi_processor_limit limit;
 148
 149         /* the _PDC objects for this processor, if any */
 150         struct acpi_object_list *pdc;
 151 };
 152
 153 struct acpi_processor_errata {
 154         u8 smp;
 155         struct {
 156                 u8 throttle:1;
 157                 u8 fdma:1;
 158                 u8 reserved:6;
 159                 u32 bmisx;
 160         } piix4;
 161 };
 162
 163 extern int acpi_processor_register_performance(struct acpi_processor_performance
 164                                                *performance, unsigned int cpu);
 165 extern void acpi_processor_unregister_performance(struct
 166                                                   acpi_processor_performance
 167                                                   *performance,
 168                                                   unsigned int cpu);
 169
 170 /* note: this locks both the calling module and the processor module
 171          if a _PPC object exists, rmmod is disallowed then */
 172 int acpi_processor_notify_smm(struct module *calling_module);
 173
 174 /* for communication between multiple parts of the processor kernel module */
 175 extern struct acpi_processor *processors[NR_CPUS];
 176 extern struct acpi_processor_errata errata;
 177
 178 void arch_acpi_processor_init_pdc(struct acpi_processor *pr);
 179
 180 #ifdef ARCH_HAS_POWER_INIT
 181 void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
 182                                         unsigned int cpu);
 183 #else
 184 static inline void acpi_processor_power_init_bm_check(struct
 185                                                       acpi_processor_flags
 186                                                       *flags, unsigned int cpu)
 187 {
 188         flags->bm_check = 1;
 189         return;
 190 }
 191 #endif
 192
 193 /* in processor_perflib.c */
 194
 195 #ifdef CONFIG_CPU_FREQ
 196 void acpi_processor_ppc_init(void);
 197 void acpi_processor_ppc_exit(void);
 198 int acpi_processor_ppc_has_changed(struct acpi_processor *pr);
 199 #else
 200 static inline void acpi_processor_ppc_init(void)
 201 {
 202         return;
 203 }
 204 static inline void acpi_processor_ppc_exit(void)
 205 {
 206         return;
 207 }
 208 static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 209 {
 210         static unsigned int printout = 1;
 211         if (printout) {
 212                 printk(KERN_WARNING
 213                        "Warning: Processor Platform Limit event detected, but not handled.\n");
 214                 printk(KERN_WARNING
 215                        "Consider compiling CPUfreq support into your kernel.\n");
 216                 printout = 0;
 217         }
 218         return 0;
 219 }
 220 #endif                          /* CONFIG_CPU_FREQ */
 221
 222 /* in processor_throttling.c */
 223 int acpi_processor_get_throttling_info(struct acpi_processor *pr);
 224 int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
 225 extern struct file_operations acpi_processor_throttling_fops;
 226
 227 /* in processor_idle.c */
 228 int acpi_processor_power_init(struct acpi_processor *pr,
 229                               struct acpi_device *device);
 230 int acpi_processor_cst_has_changed(struct acpi_processor *pr);
 231 int acpi_processor_power_exit(struct acpi_processor *pr,
 232                               struct acpi_device *device);
 233
 234 /* in processor_thermal.c */
 235 int acpi_processor_get_limit_info(struct acpi_processor *pr);
 236 extern struct file_operations acpi_processor_limit_fops;
 237
 238 #ifdef CONFIG_CPU_FREQ
 239 void acpi_thermal_cpufreq_init(void);
 240 void acpi_thermal_cpufreq_exit(void);
 241 #else
 242 static inline void acpi_thermal_cpufreq_init(void)
 243 {
 244         return;
 245 }
 246 static inline void acpi_thermal_cpufreq_exit(void)
 247 {
 248         return;
 249 }
 250 #endif
 251
 252 #endif