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         /* the _PDC objects passed by the driver, if any */
  67         struct acpi_object_list *pdc;
  68 };
  69
  70 /* Performance Management */
  71
  72 struct acpi_pct_register {
  73         u8 descriptor;
  74         u16 length;
  75         u8 space_id;
  76         u8 bit_width;
  77         u8 bit_offset;
  78         u8 reserved;
  79         u64 address;
  80 } __attribute__ ((packed));
  81
  82 struct acpi_processor_px {
  83         acpi_integer core_frequency;    /* megahertz */
  84         acpi_integer power;     /* milliWatts */
  85         acpi_integer transition_latency;        /* microseconds */
  86         acpi_integer bus_master_latency;        /* microseconds */
  87         acpi_integer control;   /* control value */
  88         acpi_integer status;    /* success indicator */
  89 };
  90
  91 struct acpi_processor_performance {
  92         unsigned int state;
  93         unsigned int platform_limit;
  94         struct acpi_pct_register control_register;
  95         struct acpi_pct_register status_register;
  96         unsigned int state_count;
  97         struct acpi_processor_px *states;
  98
  99         /* the _PDC objects passed by the driver, if any */
 100         struct acpi_object_list *pdc;
 101 };
 102
 103 /* Throttling Control */
 104
 105 struct acpi_processor_tx {
 106         u16 power;
 107         u16 performance;
 108 };
 109
 110 struct acpi_processor_throttling {
 111         int state;
 112         u32 address;
 113         u8 duty_offset;
 114         u8 duty_width;
 115         int state_count;
 116         struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
 117 };
 118
 119 /* Limit Interface */
 120
 121 struct acpi_processor_lx {
 122         int px;                 /* performace state */
 123         int tx;                 /* throttle level */
 124 };
 125
 126 struct acpi_processor_limit {
 127         struct acpi_processor_lx state; /* current limit */
 128         struct acpi_processor_lx thermal;       /* thermal limit */
 129         struct acpi_processor_lx user;  /* user limit */
 130 };
 131
 132 struct acpi_processor_flags {
 133         u8 power:1;
 134         u8 performance:1;
 135         u8 throttling:1;
 136         u8 limit:1;
 137         u8 bm_control:1;
 138         u8 bm_check:1;
 139         u8 has_cst:1;
 140         u8 power_setup_done:1;
 141 };
 142
 143 struct acpi_processor {
 144         acpi_handle handle;
 145         u32 acpi_id;
 146         u32 id;
 147         u32 pblk;
 148         int performance_platform_limit;
 149         struct acpi_processor_flags flags;
 150         struct acpi_processor_power power;
 151         struct acpi_processor_performance *performance;
 152         struct acpi_processor_throttling throttling;
 153         struct acpi_processor_limit limit;
 154 };
 155
 156 struct acpi_processor_errata {
 157         u8 smp;
 158         struct {
 159                 u8 throttle:1;
 160                 u8 fdma:1;
 161                 u8 reserved:6;
 162                 u32 bmisx;
 163         } piix4;
 164 };
 165
 166 extern int acpi_processor_register_performance(struct acpi_processor_performance
 167                                                *performance, unsigned int cpu);
 168 extern void acpi_processor_unregister_performance(struct
 169                                                   acpi_processor_performance
 170                                                   *performance,
 171                                                   unsigned int cpu);
 172
 173 /* note: this locks both the calling module and the processor module
 174          if a _PPC object exists, rmmod is disallowed then */
 175 int acpi_processor_notify_smm(struct module *calling_module);
 176
 177 /* for communication between multiple parts of the processor kernel module */
 178 extern struct acpi_processor *processors[NR_CPUS];
 179 extern struct acpi_processor_errata errata;
 180
 181 int acpi_processor_set_pdc(struct acpi_processor *pr,
 182                            struct acpi_object_list *pdc_in);
 183
 184 #ifdef ARCH_HAS_POWER_PDC_INIT
 185 void acpi_processor_power_init_pdc(struct acpi_processor_power *pow,
 186                                    unsigned int cpu);
 187 void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
 188                                         unsigned int cpu);
 189 #else
 190 static inline void acpi_processor_power_init_pdc(struct acpi_processor_power
 191                                                  *pow, unsigned int cpu)
 192 {
 193         pow->pdc = NULL;
 194         return;
 195 }
 196
 197 static inline void acpi_processor_power_init_bm_check(struct
 198                                                       acpi_processor_flags
 199                                                       *flags, unsigned int cpu)
 200 {
 201         flags->bm_check = 1;
 202         return;
 203 }
 204 #endif
 205
 206 /* in processor_perflib.c */
 207
 208 #ifdef CONFIG_CPU_FREQ
 209 void acpi_processor_ppc_init(void);
 210 void acpi_processor_ppc_exit(void);
 211 int acpi_processor_ppc_has_changed(struct acpi_processor *pr);
 212 #else
 213 static inline void acpi_processor_ppc_init(void)
 214 {
 215         return;
 216 }
 217 static inline void acpi_processor_ppc_exit(void)
 218 {
 219         return;
 220 }
 221 static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 222 {
 223         static unsigned int printout = 1;
 224         if (printout) {
 225                 printk(KERN_WARNING
 226                        "Warning: Processor Platform Limit event detected, but not handled.\n");
 227                 printk(KERN_WARNING
 228                        "Consider compiling CPUfreq support into your kernel.\n");
 229                 printout = 0;
 230         }
 231         return 0;
 232 }
 233 #endif                          /* CONFIG_CPU_FREQ */
 234
 235 /* in processor_throttling.c */
 236 int acpi_processor_get_throttling_info(struct acpi_processor *pr);
 237 int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
 238 ssize_t acpi_processor_write_throttling(struct file *file,
 239                                         const char __user * buffer,
 240                                         size_t count, loff_t * data);
 241 extern struct file_operations acpi_processor_throttling_fops;
 242
 243 /* in processor_idle.c */
 244 int acpi_processor_power_init(struct acpi_processor *pr,
 245                               struct acpi_device *device);
 246 int acpi_processor_cst_has_changed(struct acpi_processor *pr);
 247 int acpi_processor_power_exit(struct acpi_processor *pr,
 248                               struct acpi_device *device);
 249
 250 /* in processor_thermal.c */
 251 int acpi_processor_get_limit_info(struct acpi_processor *pr);
 252 ssize_t acpi_processor_write_limit(struct file *file,
 253                                    const char __user * buffer,
 254                                    size_t count, loff_t * data);
 255 extern struct file_operations acpi_processor_limit_fops;
 256
 257 #ifdef CONFIG_CPU_FREQ
 258 void acpi_thermal_cpufreq_init(void);
 259 void acpi_thermal_cpufreq_exit(void);
 260 #else
 261 static inline void acpi_thermal_cpufreq_init(void)
 262 {
 263         return;
 264 }
 265 static inline void acpi_thermal_cpufreq_exit(void)
 266 {
 267         return;
 268 }
 269 #endif
 270
 271 #endif