include/acpi/cppc_acpi.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * CPPC (Collaborative Processor Performance Control) methods used
   4  * by CPUfreq drivers.
   5  *
   6  * (C) Copyright 2014, 2015 Linaro Ltd.
   7  * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org>
   8  */
   9
  10 #ifndef _CPPC_ACPI_H
  11 #define _CPPC_ACPI_H
  12
  13 #include <linux/acpi.h>
  14 #include <linux/cpufreq.h>
  15 #include <linux/types.h>
  16
  17 #include <acpi/pcc.h>
  18 #include <acpi/processor.h>
  19
  20 /* CPPCv2 and CPPCv3 support */
  21 #define CPPC_V2_REV     2
  22 #define CPPC_V3_REV     3
  23 #define CPPC_V2_NUM_ENT 21
  24 #define CPPC_V3_NUM_ENT 23
  25
  26 #define PCC_CMD_COMPLETE_MASK   (1 << 0)
  27 #define PCC_ERROR_MASK          (1 << 2)
  28
  29 #define MAX_CPC_REG_ENT 21
  30
  31 /* CPPC specific PCC commands. */
  32 #define CMD_READ 0
  33 #define CMD_WRITE 1
  34
  35 /* Each register has the folowing format. */
  36 struct cpc_reg {
  37         u8 descriptor;
  38         u16 length;
  39         u8 space_id;
  40         u8 bit_width;
  41         u8 bit_offset;
  42         u8 access_width;
  43         u64 address;
  44 } __packed;
  45
  46 /*
  47  * Each entry in the CPC table is either
  48  * of type ACPI_TYPE_BUFFER or
  49  * ACPI_TYPE_INTEGER.
  50  */
  51 struct cpc_register_resource {
  52         acpi_object_type type;
  53         u64 __iomem *sys_mem_vaddr;
  54         union {
  55                 struct cpc_reg reg;
  56                 u64 int_value;
  57         } cpc_entry;
  58 };
  59
  60 /* Container to hold the CPC details for each CPU */
  61 struct cpc_desc {
  62         int num_entries;
  63         int version;
  64         int cpu_id;
  65         int write_cmd_status;
  66         int write_cmd_id;
  67         /* Lock used for RMW operations in cpc_write() */
  68         raw_spinlock_t rmw_lock;
  69         struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
  70         struct acpi_psd_package domain_info;
  71         struct kobject kobj;
  72 };
  73
  74 /* These are indexes into the per-cpu cpc_regs[]. Order is important. */
  75 enum cppc_regs {
  76         HIGHEST_PERF,
  77         NOMINAL_PERF,
  78         LOW_NON_LINEAR_PERF,
  79         LOWEST_PERF,
  80         GUARANTEED_PERF,
  81         DESIRED_PERF,
  82         MIN_PERF,
  83         MAX_PERF,
  84         PERF_REDUC_TOLERANCE,
  85         TIME_WINDOW,
  86         CTR_WRAP_TIME,
  87         REFERENCE_CTR,
  88         DELIVERED_CTR,
  89         PERF_LIMITED,
  90         ENABLE,
  91         AUTO_SEL_ENABLE,
  92         AUTO_ACT_WINDOW,
  93         ENERGY_PERF,
  94         REFERENCE_PERF,
  95         LOWEST_FREQ,
  96         NOMINAL_FREQ,
  97 };
  98
  99 /*
 100  * Categorization of registers as described
 101  * in the ACPI v.5.1 spec.
 102  * XXX: Only filling up ones which are used by governors
 103  * today.
 104  */
 105 struct cppc_perf_caps {
 106         u32 guaranteed_perf;
 107         u32 highest_perf;
 108         u32 nominal_perf;
 109         u32 lowest_perf;
 110         u32 lowest_nonlinear_perf;
 111         u32 lowest_freq;
 112         u32 nominal_freq;
 113         u32 energy_perf;
 114         bool auto_sel;
 115 };
 116
 117 struct cppc_perf_ctrls {
 118         u32 max_perf;
 119         u32 min_perf;
 120         u32 desired_perf;
 121         u32 energy_perf;
 122 };
 123
 124 struct cppc_perf_fb_ctrs {
 125         u64 reference;
 126         u64 delivered;
 127         u64 reference_perf;
 128         u64 wraparound_time;
 129 };
 130
 131 /* Per CPU container for runtime CPPC management. */
 132 struct cppc_cpudata {
 133         struct list_head node;
 134         struct cppc_perf_caps perf_caps;
 135         struct cppc_perf_ctrls perf_ctrls;
 136         struct cppc_perf_fb_ctrs perf_fb_ctrs;
 137         unsigned int shared_type;
 138         cpumask_var_t shared_cpu_map;
 139 };
 140
 141 #ifdef CONFIG_ACPI_CPPC_LIB
 142 extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
 143 extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf);
 144 extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf);
 145 extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
 146 extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
 147 extern int cppc_set_enable(int cpu, bool enable);
 148 extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
 149 extern bool cppc_perf_ctrs_in_pcc(void);
 150 extern unsigned int cppc_perf_to_khz(struct cppc_perf_caps *caps, unsigned int perf);
 151 extern unsigned int cppc_khz_to_perf(struct cppc_perf_caps *caps, unsigned int freq);
 152 extern bool acpi_cpc_valid(void);
 153 extern bool cppc_allow_fast_switch(void);
 154 extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
 155 extern unsigned int cppc_get_transition_latency(int cpu);
 156 extern bool cpc_ffh_supported(void);
 157 extern bool cpc_supported_by_cpu(void);
 158 extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
 159 extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
 160 extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf);
 161 extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable);
 162 extern int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps);
 163 extern int cppc_set_auto_sel(int cpu, bool enable);
 164 extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf);
 165 extern int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator);
 166 extern int amd_detect_prefcore(bool *detected);
 167 #else /* !CONFIG_ACPI_CPPC_LIB */
 168 static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
 169 {
 170         return -EOPNOTSUPP;
 171 }
 172 static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
 173 {
 174         return -EOPNOTSUPP;
 175 }
 176 static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
 177 {
 178         return -EOPNOTSUPP;
 179 }
 180 static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
 181 {
 182         return -EOPNOTSUPP;
 183 }
 184 static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
 185 {
 186         return -EOPNOTSUPP;
 187 }
 188 static inline int cppc_set_enable(int cpu, bool enable)
 189 {
 190         return -EOPNOTSUPP;
 191 }
 192 static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps)
 193 {
 194         return -EOPNOTSUPP;
 195 }
 196 static inline bool cppc_perf_ctrs_in_pcc(void)
 197 {
 198         return false;
 199 }
 200 static inline bool acpi_cpc_valid(void)
 201 {
 202         return false;
 203 }
 204 static inline bool cppc_allow_fast_switch(void)
 205 {
 206         return false;
 207 }
 208 static inline unsigned int cppc_get_transition_latency(int cpu)
 209 {
 210         return CPUFREQ_ETERNAL;
 211 }
 212 static inline bool cpc_ffh_supported(void)
 213 {
 214         return false;
 215 }
 216 static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
 217 {
 218         return -EOPNOTSUPP;
 219 }
 220 static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
 221 {
 222         return -EOPNOTSUPP;
 223 }
 224 static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
 225 {
 226         return -EOPNOTSUPP;
 227 }
 228 static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
 229 {
 230         return -EOPNOTSUPP;
 231 }
 232 static inline int cppc_set_auto_sel(int cpu, bool enable)
 233 {
 234         return -EOPNOTSUPP;
 235 }
 236 static inline int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps)
 237 {
 238         return -EOPNOTSUPP;
 239 }
 240 static inline int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf)
 241 {
 242         return -ENODEV;
 243 }
 244 static inline int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator)
 245 {
 246         return -EOPNOTSUPP;
 247 }
 248 static inline int amd_detect_prefcore(bool *detected)
 249 {
 250         return -ENODEV;
 251 }
 252 #endif /* !CONFIG_ACPI_CPPC_LIB */
 253
 254 #endif /* _CPPC_ACPI_H*/