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