forked from mirrors/linux
d4da12f803
Adds online and offline driver callback support to allow cpu cores go offline and help to restore the previous working states when core goes back online later for EPP driver mode. Acked-by: Huang Rui <ray.huang@amd.com> Reviewed-by: Mario Limonciello <Mario.Limonciello@amd.com> Reviewed-by: Wyes Karny <wyes.karny@amd.com> Tested-by: Wyes Karny <wyes.karny@amd.com> Signed-off-by: Perry Yuan <Perry.Yuan@amd.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/include/linux/amd-pstate.h
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*
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* Copyright (C) 2022 Advanced Micro Devices, Inc.
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*
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* Author: Meng Li <li.meng@amd.com>
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*/
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#ifndef _LINUX_AMD_PSTATE_H
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#define _LINUX_AMD_PSTATE_H
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#include <linux/pm_qos.h>
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#define AMD_CPPC_EPP_PERFORMANCE 0x00
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#define AMD_CPPC_EPP_BALANCE_PERFORMANCE 0x80
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#define AMD_CPPC_EPP_BALANCE_POWERSAVE 0xBF
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#define AMD_CPPC_EPP_POWERSAVE 0xFF
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/*********************************************************************
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* AMD P-state INTERFACE *
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*********************************************************************/
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/**
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* struct amd_aperf_mperf
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* @aperf: actual performance frequency clock count
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* @mperf: maximum performance frequency clock count
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* @tsc: time stamp counter
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*/
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struct amd_aperf_mperf {
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u64 aperf;
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u64 mperf;
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u64 tsc;
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};
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/**
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* struct amd_cpudata - private CPU data for AMD P-State
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* @cpu: CPU number
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* @req: constraint request to apply
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* @cppc_req_cached: cached performance request hints
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* @highest_perf: the maximum performance an individual processor may reach,
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* assuming ideal conditions
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* @nominal_perf: the maximum sustained performance level of the processor,
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* assuming ideal operating conditions
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* @lowest_nonlinear_perf: the lowest performance level at which nonlinear power
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* savings are achieved
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* @lowest_perf: the absolute lowest performance level of the processor
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* @max_freq: the frequency that mapped to highest_perf
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* @min_freq: the frequency that mapped to lowest_perf
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* @nominal_freq: the frequency that mapped to nominal_perf
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* @lowest_nonlinear_freq: the frequency that mapped to lowest_nonlinear_perf
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* @cur: Difference of Aperf/Mperf/tsc count between last and current sample
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* @prev: Last Aperf/Mperf/tsc count value read from register
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* @freq: current cpu frequency value
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* @boost_supported: check whether the Processor or SBIOS supports boost mode
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* @epp_policy: Last saved policy used to set energy-performance preference
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* @epp_cached: Cached CPPC energy-performance preference value
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* @policy: Cpufreq policy value
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* @cppc_cap1_cached Cached MSR_AMD_CPPC_CAP1 register value
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*
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* The amd_cpudata is key private data for each CPU thread in AMD P-State, and
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* represents all the attributes and goals that AMD P-State requests at runtime.
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*/
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struct amd_cpudata {
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int cpu;
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struct freq_qos_request req[2];
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u64 cppc_req_cached;
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u32 highest_perf;
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u32 nominal_perf;
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u32 lowest_nonlinear_perf;
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u32 lowest_perf;
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u32 max_freq;
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u32 min_freq;
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u32 nominal_freq;
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u32 lowest_nonlinear_freq;
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struct amd_aperf_mperf cur;
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struct amd_aperf_mperf prev;
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u64 freq;
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bool boost_supported;
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/* EPP feature related attributes*/
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s16 epp_policy;
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s16 epp_cached;
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u32 policy;
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u64 cppc_cap1_cached;
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bool suspended;
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};
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/*
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* enum amd_pstate_mode - driver working mode of amd pstate
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*/
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enum amd_pstate_mode {
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AMD_PSTATE_DISABLE = 0,
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AMD_PSTATE_PASSIVE,
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AMD_PSTATE_ACTIVE,
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AMD_PSTATE_MAX,
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};
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static const char * const amd_pstate_mode_string[] = {
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[AMD_PSTATE_DISABLE] = "disable",
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[AMD_PSTATE_PASSIVE] = "passive",
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[AMD_PSTATE_ACTIVE] = "active",
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NULL,
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};
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#endif /* _LINUX_AMD_PSTATE_H */
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