include/acpi/processor.h

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