87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2023 Rivos Inc
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*
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* Authors:
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* Atish Patra <atishp@rivosinc.com>
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/kvm_host.h>
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#include <asm/csr.h>
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#include <asm/sbi.h>
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#include <asm/kvm_vcpu_sbi.h>
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static int kvm_sbi_ext_pmu_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
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struct kvm_vcpu_sbi_return *retdata)
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{
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int ret = 0;
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
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struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
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unsigned long funcid = cp->a6;
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u64 temp;
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if (!kvpmu->init_done) {
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retdata->err_val = SBI_ERR_NOT_SUPPORTED;
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return 0;
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}
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switch (funcid) {
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case SBI_EXT_PMU_NUM_COUNTERS:
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ret = kvm_riscv_vcpu_pmu_num_ctrs(vcpu, retdata);
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break;
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case SBI_EXT_PMU_COUNTER_GET_INFO:
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ret = kvm_riscv_vcpu_pmu_ctr_info(vcpu, cp->a0, retdata);
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break;
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case SBI_EXT_PMU_COUNTER_CFG_MATCH:
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#if defined(CONFIG_32BIT)
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temp = ((uint64_t)cp->a5 << 32) | cp->a4;
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#else
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temp = cp->a4;
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#endif
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/*
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* This can fail if perf core framework fails to create an event.
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* Forward the error to userspace because it's an error which
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* happened within the host kernel. The other option would be
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* to convert to an SBI error and forward to the guest.
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*/
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ret = kvm_riscv_vcpu_pmu_ctr_cfg_match(vcpu, cp->a0, cp->a1,
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cp->a2, cp->a3, temp, retdata);
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break;
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case SBI_EXT_PMU_COUNTER_START:
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#if defined(CONFIG_32BIT)
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temp = ((uint64_t)cp->a4 << 32) | cp->a3;
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#else
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temp = cp->a3;
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#endif
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ret = kvm_riscv_vcpu_pmu_ctr_start(vcpu, cp->a0, cp->a1, cp->a2,
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temp, retdata);
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break;
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case SBI_EXT_PMU_COUNTER_STOP:
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ret = kvm_riscv_vcpu_pmu_ctr_stop(vcpu, cp->a0, cp->a1, cp->a2, retdata);
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break;
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case SBI_EXT_PMU_COUNTER_FW_READ:
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ret = kvm_riscv_vcpu_pmu_ctr_read(vcpu, cp->a0, retdata);
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break;
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default:
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retdata->err_val = SBI_ERR_NOT_SUPPORTED;
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}
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return ret;
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}
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static unsigned long kvm_sbi_ext_pmu_probe(struct kvm_vcpu *vcpu)
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{
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struct kvm_pmu *kvpmu = vcpu_to_pmu(vcpu);
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return kvpmu->init_done;
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}
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_pmu = {
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.extid_start = SBI_EXT_PMU,
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.extid_end = SBI_EXT_PMU,
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.handler = kvm_sbi_ext_pmu_handler,
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.probe = kvm_sbi_ext_pmu_probe,
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};
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