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linux/include/acpi/cppc_acpi.h
Rafael J. Wysocki c28a280bd4 ACPI: CPPC: Do not use CPUFREQ_ETERNAL as an error value 
Instead of using CPUFREQ_ETERNAL for signaling an error condition
in cppc_get_transition_latency(), change the return value type of
that function to int and make it return a proper negative error
code on failures.

No intentional functional impact.

Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Reviewed-by: Jie Zhan <zhanjie9@hisilicon.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Qais Yousef <qyousef@layalina.io>
2025-10-01 13:57:13 +02:00

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/* 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
#define CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE (7)
#define CPPC_AUTO_ACT_WINDOW_EXP_BIT_SIZE (3)
#define CPPC_AUTO_ACT_WINDOW_MAX_SIG ((1 << CPPC_AUTO_ACT_WINDOW_SIG_BIT_SIZE) - 1)
#define CPPC_AUTO_ACT_WINDOW_MAX_EXP ((1 << CPPC_AUTO_ACT_WINDOW_EXP_BIT_SIZE) - 1)
/* CPPC_AUTO_ACT_WINDOW_MAX_SIG is 127, so 128 and 129 will decay to 127 when writing */
#define CPPC_AUTO_ACT_WINDOW_SIG_CARRY_THRESH 129
#define CPPC_ENERGY_PERF_MAX (0xFF)
/* 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;
/* Lock used for RMW operations in cpc_write() */
raw_spinlock_t rmw_lock;
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 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_highest_perf(int cpunum, u64 *highest_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 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_set_epp(int cpu, u64 epp_val);
extern int cppc_get_auto_act_window(int cpu, u64 *auto_act_window);
extern int cppc_set_auto_act_window(int cpu, u64 auto_act_window);
extern int cppc_get_auto_sel(int cpu, bool *enable);
extern int cppc_set_auto_sel(int cpu, bool enable);
extern int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf);
extern int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator);
extern int amd_detect_prefcore(bool *detected);
#else /* !CONFIG_ACPI_CPPC_LIB */
static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
{
return -EOPNOTSUPP;
}
static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
{
return -EOPNOTSUPP;
}
static inline int cppc_set_enable(int cpu, bool enable)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps)
{
return -EOPNOTSUPP;
}
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 int cppc_get_transition_latency(int cpu)
{
return -ENODATA;
}
static inline bool cpc_ffh_supported(void)
{
return false;
}
static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
{
return -EOPNOTSUPP;
}
static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
{
return -EOPNOTSUPP;
}
static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls, bool enable)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_epp_perf(int cpunum, u64 *epp_perf)
{
return -EOPNOTSUPP;
}
static inline int cppc_set_epp(int cpu, u64 epp_val)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_auto_act_window(int cpu, u64 *auto_act_window)
{
return -EOPNOTSUPP;
}
static inline int cppc_set_auto_act_window(int cpu, u64 auto_act_window)
{
return -EOPNOTSUPP;
}
static inline int cppc_get_auto_sel(int cpu, bool *enable)
{
return -EOPNOTSUPP;
}
static inline int cppc_set_auto_sel(int cpu, bool enable)
{
return -EOPNOTSUPP;
}
static inline int amd_get_highest_perf(unsigned int cpu, u32 *highest_perf)
{
return -ENODEV;
}
static inline int amd_get_boost_ratio_numerator(unsigned int cpu, u64 *numerator)
{
return -EOPNOTSUPP;
}
static inline int amd_detect_prefcore(bool *detected)
{
return -ENODEV;
}
#endif /* !CONFIG_ACPI_CPPC_LIB */
#endif /* _CPPC_ACPI_H*/
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