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usr
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src
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linux-headers-6.8.0-36
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include
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acpi
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drwxr-xr-x
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cppc_acpi.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * CPPC (Collaborative Processor Performance Control) methods used * by CPUfreq drivers. * * (C) Copyright 2014, 2015 Linaro Ltd. * Author: Ashwin Chaugule <ashwin.chaugule@linaro.org> */ #ifndef _CPPC_ACPI_H #define _CPPC_ACPI_H #include <linux/acpi.h> #include <linux/cpufreq.h> #include <linux/types.h> #include <acpi/pcc.h> #include <acpi/processor.h> /* CPPCv2 and CPPCv3 support */ #define CPPC_V2_REV 2 #define CPPC_V3_REV 3 #define CPPC_V2_NUM_ENT 21 #define CPPC_V3_NUM_ENT 23 #define PCC_CMD_COMPLETE_MASK (1 << 0) #define PCC_ERROR_MASK (1 << 2) #define MAX_CPC_REG_ENT 21 /* CPPC specific PCC commands. */ #define CMD_READ 0 #define CMD_WRITE 1 /* Each register has the folowing format. */ struct cpc_reg { u8 descriptor; u16 length; u8 space_id; u8 bit_width; u8 bit_offset; u8 access_width; u64 address; } __packed; /* * Each entry in the CPC table is either * of type ACPI_TYPE_BUFFER or * ACPI_TYPE_INTEGER. */ struct cpc_register_resource { acpi_object_type type; u64 __iomem *sys_mem_vaddr; union { struct cpc_reg reg; u64 int_value; } cpc_entry; }; /* Container to hold the CPC details for each CPU */ struct cpc_desc { int num_entries; int version; int cpu_id; int write_cmd_status; int write_cmd_id; struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT]; struct acpi_psd_package domain_info; struct kobject kobj; }; /* These are indexes into the per-cpu cpc_regs[]. Order is important. */ enum cppc_regs { HIGHEST_PERF, NOMINAL_PERF, LOW_NON_LINEAR_PERF, LOWEST_PERF, GUARANTEED_PERF, DESIRED_PERF, MIN_PERF, MAX_PERF, PERF_REDUC_TOLERANCE, TIME_WINDOW, CTR_WRAP_TIME, REFERENCE_CTR, DELIVERED_CTR, PERF_LIMITED, ENABLE, AUTO_SEL_ENABLE, AUTO_ACT_WINDOW, ENERGY_PERF, REFERENCE_PERF, LOWEST_FREQ, NOMINAL_FREQ, }; /* * Categorization of registers as described * in the ACPI v.5.1 spec. * XXX: Only filling up ones which are used by governors * today. */ struct cppc_perf_caps { u32 guaranteed_perf; u32 highest_perf; u32 nominal_perf; u32 lowest_perf; u32 lowest_nonlinear_perf; u32 lowest_freq; u32 nominal_freq; u32 energy_perf; bool auto_sel; }; struct cppc_perf_ctrls { u32 max_perf; u32 min_perf; u32 desired_perf; u32 energy_perf; }; struct cppc_perf_fb_ctrs { u64 reference; u64 delivered; u64 reference_perf; u64 wraparound_time; }; /* Per CPU container for runtime CPPC management. */ struct cppc_cpudata { struct list_head node; struct cppc_perf_caps perf_caps; struct cppc_perf_ctrls perf_ctrls; struct cppc_perf_fb_ctrs perf_fb_ctrs; unsigned int shared_type; cpumask_var_t shared_cpu_map; }; #ifdef CONFIG_ACPI_CPPC_LIB extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf); extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); extern int cppc_set_enable(int cpu, bool enable); extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps); extern bool cppc_perf_ctrs_in_pcc(void); extern unsigned int cppc_perf_to_khz(struct cppc_perf_caps *caps, unsigned int perf); extern unsigned int cppc_khz_to_perf(struct cppc_perf_caps *caps, unsigned int freq); extern bool acpi_cpc_valid(void); extern bool cppc_allow_fast_switch(void); extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data); extern unsigned int cppc_get_transition_latency(int cpu); extern bool cpc_ffh_supported(void); extern bool cpc_supported_by_cpu(void); extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val); extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val); extern int cppc_get_epp_perf(int cpunum, u64 *epp_perf); extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable); extern int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps); extern int cppc_set_auto_sel(int cpu, bool enable); #else /* !CONFIG_ACPI_CPPC_LIB */ static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf) { return -ENOTSUPP; } static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf) { return -ENOTSUPP; } static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs) { return -ENOTSUPP; } static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) { return -ENOTSUPP; } static inline int cppc_set_enable(int cpu, bool enable) { return -ENOTSUPP; } static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps) { return -ENOTSUPP; } static inline bool cppc_perf_ctrs_in_pcc(void) { return false; } static inline bool acpi_cpc_valid(void) { return false; } static inline bool cppc_allow_fast_switch(void) { return false; } static inline unsigned int cppc_get_transition_latency(int cpu) { return CPUFREQ_ETERNAL; } static inline bool cpc_ffh_supported(void) { return false; } static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val) { return -ENOTSUPP; } static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val) { return -ENOTSUPP; } static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable) { return -ENOTSUPP; } static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf) { return -ENOTSUPP; } static inline int cppc_set_auto_sel(int cpu, bool enable) { return -ENOTSUPP; } static inline int cppc_get_auto_sel_caps(int cpunum, struct cppc_perf_caps *perf_caps) { return -ENOTSUPP; } #endif /* !CONFIG_ACPI_CPPC_LIB */ #endif /* _CPPC_ACPI_H*/
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