cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cppc_acpi.h (4618B)

      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/* Support CPPCv2 and CPPCv3  */
     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. */
     36struct 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 */
     51struct 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 */
     61struct cpc_desc {
     62	int num_entries;
     63	int version;
     64	int cpu_id;
     65	int write_cmd_status;
     66	int write_cmd_id;
     67	struct cpc_register_resource cpc_regs[MAX_CPC_REG_ENT];
     68	struct acpi_psd_package domain_info;
     69	struct kobject kobj;
     70};
     71
     72/* These are indexes into the per-cpu cpc_regs[]. Order is important. */
     73enum cppc_regs {
     74	HIGHEST_PERF,
     75	NOMINAL_PERF,
     76	LOW_NON_LINEAR_PERF,
     77	LOWEST_PERF,
     78	GUARANTEED_PERF,
     79	DESIRED_PERF,
     80	MIN_PERF,
     81	MAX_PERF,
     82	PERF_REDUC_TOLERANCE,
     83	TIME_WINDOW,
     84	CTR_WRAP_TIME,
     85	REFERENCE_CTR,
     86	DELIVERED_CTR,
     87	PERF_LIMITED,
     88	ENABLE,
     89	AUTO_SEL_ENABLE,
     90	AUTO_ACT_WINDOW,
     91	ENERGY_PERF,
     92	REFERENCE_PERF,
     93	LOWEST_FREQ,
     94	NOMINAL_FREQ,
     95};
     96
     97/*
     98 * Categorization of registers as described
     99 * in the ACPI v.5.1 spec.
    100 * XXX: Only filling up ones which are used by governors
    101 * today.
    102 */
    103struct cppc_perf_caps {
    104	u32 guaranteed_perf;
    105	u32 highest_perf;
    106	u32 nominal_perf;
    107	u32 lowest_perf;
    108	u32 lowest_nonlinear_perf;
    109	u32 lowest_freq;
    110	u32 nominal_freq;
    111};
    112
    113struct cppc_perf_ctrls {
    114	u32 max_perf;
    115	u32 min_perf;
    116	u32 desired_perf;
    117};
    118
    119struct cppc_perf_fb_ctrs {
    120	u64 reference;
    121	u64 delivered;
    122	u64 reference_perf;
    123	u64 wraparound_time;
    124};
    125
    126/* Per CPU container for runtime CPPC management. */
    127struct cppc_cpudata {
    128	struct list_head node;
    129	struct cppc_perf_caps perf_caps;
    130	struct cppc_perf_ctrls perf_ctrls;
    131	struct cppc_perf_fb_ctrs perf_fb_ctrs;
    132	unsigned int shared_type;
    133	cpumask_var_t shared_cpu_map;
    134};
    135
    136#ifdef CONFIG_ACPI_CPPC_LIB
    137extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf);
    138extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf);
    139extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs);
    140extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
    141extern int cppc_set_enable(int cpu, bool enable);
    142extern int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps);
    143extern bool acpi_cpc_valid(void);
    144extern bool cppc_allow_fast_switch(void);
    145extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
    146extern unsigned int cppc_get_transition_latency(int cpu);
    147extern bool cpc_ffh_supported(void);
    148extern bool cpc_supported_by_cpu(void);
    149extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
    150extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
    151#else /* !CONFIG_ACPI_CPPC_LIB */
    152static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
    153{
    154	return -ENOTSUPP;
    155}
    156static inline int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf)
    157{
    158	return -ENOTSUPP;
    159}
    160static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
    161{
    162	return -ENOTSUPP;
    163}
    164static inline int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
    165{
    166	return -ENOTSUPP;
    167}
    168static inline int cppc_set_enable(int cpu, bool enable)
    169{
    170	return -ENOTSUPP;
    171}
    172static inline int cppc_get_perf_caps(int cpu, struct cppc_perf_caps *caps)
    173{
    174	return -ENOTSUPP;
    175}
    176static inline bool acpi_cpc_valid(void)
    177{
    178	return false;
    179}
    180static inline bool cppc_allow_fast_switch(void)
    181{
    182	return false;
    183}
    184static inline unsigned int cppc_get_transition_latency(int cpu)
    185{
    186	return CPUFREQ_ETERNAL;
    187}
    188static inline bool cpc_ffh_supported(void)
    189{
    190	return false;
    191}
    192static inline int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val)
    193{
    194	return -ENOTSUPP;
    195}
    196static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
    197{
    198	return -ENOTSUPP;
    199}
    200#endif /* !CONFIG_ACPI_CPPC_LIB */
    201
    202#endif /* _CPPC_ACPI_H*/