64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
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/*
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* Copyright (C) 2015 Linaro Ltd.
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* Author: Shannon Zhao <shannon.zhao@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/cpu.h>
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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#include <linux/perf_event.h>
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#include <asm/kvm_emulate.h>
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#include <kvm/arm_pmu.h>
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/**
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* kvm_pmu_get_counter_value - get PMU counter value
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* @vcpu: The vcpu pointer
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* @select_idx: The counter index
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*/
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u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx)
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{
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u64 counter, reg, enabled, running;
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struct kvm_pmu *pmu = &vcpu->arch.pmu;
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struct kvm_pmc *pmc = &pmu->pmc[select_idx];
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reg = (select_idx == ARMV8_PMU_CYCLE_IDX)
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? PMCCNTR_EL0 : PMEVCNTR0_EL0 + select_idx;
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counter = vcpu_sys_reg(vcpu, reg);
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/* The real counter value is equal to the value of counter register plus
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* the value perf event counts.
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*/
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if (pmc->perf_event)
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counter += perf_event_read_value(pmc->perf_event, &enabled,
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&running);
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return counter & pmc->bitmask;
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}
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/**
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* kvm_pmu_set_counter_value - set PMU counter value
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* @vcpu: The vcpu pointer
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* @select_idx: The counter index
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* @val: The counter value
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*/
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void kvm_pmu_set_counter_value(struct kvm_vcpu *vcpu, u64 select_idx, u64 val)
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{
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u64 reg;
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reg = (select_idx == ARMV8_PMU_CYCLE_IDX)
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? PMCCNTR_EL0 : PMEVCNTR0_EL0 + select_idx;
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vcpu_sys_reg(vcpu, reg) += (s64)val - kvm_pmu_get_counter_value(vcpu, select_idx);
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}
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