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e309fd113b
The new get_event_info funciton allows the guest to query the presence of multiple events with single SBI call. Currently, the perf driver in linux guest invokes it for all the standard SBI PMU events. Support the SBI function implementation in KVM as well. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Acked-by: Paul Walmsley <pjw@kernel.org> Link: https://lore.kernel.org/r/20250909-pmu_event_info-v6-7-d8f80cacb884@rivosinc.com Signed-off-by: Anup Patel <anup@brainfault.org>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
// 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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* No need to forward the error to userspace and exit the guest.
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* The operation can continue without profiling. Forward the
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* appropriate SBI error 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_fw_ctr_read(vcpu, cp->a0, retdata);
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break;
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case SBI_EXT_PMU_COUNTER_FW_READ_HI:
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if (IS_ENABLED(CONFIG_32BIT))
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ret = kvm_riscv_vcpu_pmu_fw_ctr_read_hi(vcpu, cp->a0, retdata);
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else
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retdata->out_val = 0;
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break;
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case SBI_EXT_PMU_SNAPSHOT_SET_SHMEM:
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ret = kvm_riscv_vcpu_pmu_snapshot_set_shmem(vcpu, cp->a0, cp->a1, cp->a2, retdata);
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break;
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case SBI_EXT_PMU_EVENT_GET_INFO:
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ret = kvm_riscv_vcpu_pmu_event_info(vcpu, cp->a0, cp->a1, cp->a2, cp->a3, 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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