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
  36 struct acpi_processor_cx_policy {
  37         u32                     count;
  38         struct acpi_processor_cx *state;
  39         struct {
  40                 u32                     time;
  41                 u32                     ticks;
  42                 u32                     count;
  43                 u32                     bm;
  44         }                       threshold;
  45 };
  46
  47 struct acpi_processor_cx {
  48         u8                      valid;
  49         u8                      type;
  50         u32                     address;
  51         u32                     latency;
  52         u32                     latency_ticks;
  53         u32                     power;
  54         u32                     usage;
  55         struct acpi_processor_cx_policy promotion;
  56         struct acpi_processor_cx_policy demotion;
  57 };
  58
  59 struct acpi_processor_power {
  60         struct acpi_processor_cx *state;
  61         unsigned long           bm_check_timestamp;
  62         u32                     default_state;
  63         u32                     bm_activity;
  64         int                     count;
  65         struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
  66
  67         /* the _PDC objects passed by the driver, if any */
  68         struct acpi_object_list *pdc;
  69 };
  70
  71 /* Performance Management */
  72
  73 struct acpi_pct_register {
  74         u8                      descriptor;
  75         u16                     length;
  76         u8                      space_id;
  77         u8                      bit_width;
  78         u8                      bit_offset;
  79         u8                      reserved;
  80         u64                     address;
  81 } __attribute__ ((packed));
  82
  83 struct acpi_processor_px {
  84         acpi_integer            core_frequency;         /* megahertz */
  85         acpi_integer            power;                  /* milliWatts */
  86         acpi_integer            transition_latency;     /* microseconds */
  87         acpi_integer            bus_master_latency;     /* microseconds */
  88         acpi_integer            control;                /* control value */
  89         acpi_integer            status;                 /* success indicator */
  90 };
  91
  92 struct acpi_processor_performance {
  93         unsigned int             state;
  94         unsigned int             platform_limit;
  95         struct acpi_pct_register control_register;
  96         struct acpi_pct_register status_register;
  97         unsigned int             state_count;
  98         struct acpi_processor_px *states;
  99
 100         /* the _PDC objects passed by the driver, if any */
 101         struct acpi_object_list *pdc;
 102 };
 103
 104
 105
 106 /* Throttling Control */
 107
 108 struct acpi_processor_tx {
 109         u16                     power;
 110         u16                     performance;
 111 };
 112
 113 struct acpi_processor_throttling {
 114         int                     state;
 115         u32                     address;
 116         u8                      duty_offset;
 117         u8                      duty_width;
 118         int                     state_count;
 119         struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
 120 };
 121
 122 /* Limit Interface */
 123
 124 struct acpi_processor_lx {
 125         int                     px;             /* performace state */
 126         int                     tx;             /* throttle level */
 127 };
 128
 129 struct acpi_processor_limit {
 130         struct acpi_processor_lx state;         /* current limit */
 131         struct acpi_processor_lx thermal;       /* thermal limit */
 132         struct acpi_processor_lx user;          /* user limit */
 133 };
 134
 135
 136 struct acpi_processor_flags {
 137         u8                      power:1;
 138         u8                      performance:1;
 139         u8                      throttling:1;
 140         u8                      limit:1;
 141         u8                      bm_control:1;
 142         u8                      bm_check:1;
 143         u8                      has_cst:1;
 144         u8                      power_setup_done:1;
 145 };
 146
 147 struct acpi_processor {
 148         acpi_handle             handle;
 149         u32                     acpi_id;
 150         u32                     id;
 151         u32                     pblk;
 152         int                     performance_platform_limit;
 153         struct acpi_processor_flags flags;
 154         struct acpi_processor_power power;
 155         struct acpi_processor_performance *performance;
 156         struct acpi_processor_throttling throttling;
 157         struct acpi_processor_limit limit;
 158 };
 159
 160 struct acpi_processor_errata {
 161         u8                      smp;
 162         struct {
 163                 u8                      throttle:1;
 164                 u8                      fdma:1;
 165                 u8                      reserved:6;
 166                 u32                     bmisx;
 167         }                       piix4;
 168 };
 169
 170 extern int acpi_processor_register_performance (
 171         struct acpi_processor_performance * performance,
 172         unsigned int cpu);
 173 extern void acpi_processor_unregister_performance (
 174         struct acpi_processor_performance * performance,
 175         unsigned int cpu);
 176
 177 /* note: this locks both the calling module and the processor module
 178          if a _PPC object exists, rmmod is disallowed then */
 179 int acpi_processor_notify_smm(struct module *calling_module);
 180
 181
 182
 183 /* for communication between multiple parts of the processor kernel module */
 184 extern struct acpi_processor    *processors[NR_CPUS];
 185 extern struct acpi_processor_errata errata;
 186
 187 int acpi_processor_set_pdc(struct acpi_processor *pr,
 188                 struct acpi_object_list *pdc_in);
 189
 190 #ifdef ARCH_HAS_POWER_PDC_INIT
 191 void acpi_processor_power_init_pdc(struct acpi_processor_power *pow,
 192                 unsigned int cpu);
 193 void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
 194                 unsigned int cpu);
 195 #else
 196 static inline void acpi_processor_power_init_pdc(
 197                 struct acpi_processor_power *pow, unsigned int cpu)
 198 {
 199         pow->pdc = NULL;
 200         return;
 201 }
 202
 203 static inline void acpi_processor_power_init_bm_check(
 204                 struct acpi_processor_flags *flags, unsigned int cpu)
 205 {
 206         flags->bm_check = 1;
 207         return;
 208 }
 209 #endif
 210
 211 /* in processor_perflib.c */
 212
 213 #ifdef CONFIG_CPU_FREQ
 214 void acpi_processor_ppc_init(void);
 215 void acpi_processor_ppc_exit(void);
 216 int acpi_processor_ppc_has_changed(struct acpi_processor *pr);
 217 #else
 218 static inline void acpi_processor_ppc_init(void) { return; }
 219 static inline void acpi_processor_ppc_exit(void) { return; }
 220 static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr) {
 221         static unsigned int printout = 1;
 222         if (printout) {
 223                 printk(KERN_WARNING "Warning: Processor Platform Limit event detected, but not handled.\n");
 224                 printk(KERN_WARNING "Consider compiling CPUfreq support into your kernel.\n");
 225                 printout = 0;
 226         }
 227         return 0;
 228 }
 229 #endif /* CONFIG_CPU_FREQ */
 230
 231 /* in processor_throttling.c */
 232 int acpi_processor_get_throttling_info (struct acpi_processor *pr);
 233 int acpi_processor_set_throttling (struct acpi_processor *pr, int state);
 234 ssize_t acpi_processor_write_throttling (
 235         struct file             *file,
 236         const char              __user *buffer,
 237         size_t                  count,
 238         loff_t                  *data);
 239 extern struct file_operations acpi_processor_throttling_fops;
 240
 241 /* in processor_idle.c */
 242 int acpi_processor_power_init(struct acpi_processor *pr, struct acpi_device *device);
 243 int acpi_processor_cst_has_changed (struct acpi_processor *pr);
 244 int acpi_processor_power_exit(struct acpi_processor *pr, struct acpi_device *device);
 245
 246
 247 /* in processor_thermal.c */
 248 int acpi_processor_get_limit_info (struct acpi_processor *pr);
 249 ssize_t acpi_processor_write_limit (
 250         struct file             *file,
 251         const char              __user *buffer,
 252         size_t                  count,
 253         loff_t                  *data);
 254 extern struct file_operations acpi_processor_limit_fops;
 255
 256 #ifdef CONFIG_CPU_FREQ
 257 void acpi_thermal_cpufreq_init(void);
 258 void acpi_thermal_cpufreq_exit(void);
 259 #else
 260 static inline void acpi_thermal_cpufreq_init(void) { return; }
 261 static inline void acpi_thermal_cpufreq_exit(void) { return; }
 262 #endif
 263
 264
 265 #endif