74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* perf.h - performance monitor header
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*
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* Copyright (C) 2021 Intel Corporation
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*
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* Author: Lu Baolu <baolu.lu@linux.intel.com>
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*/
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enum latency_type {
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DMAR_LATENCY_INV_IOTLB = 0,
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DMAR_LATENCY_INV_DEVTLB,
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DMAR_LATENCY_INV_IEC,
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DMAR_LATENCY_PRQ,
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DMAR_LATENCY_NUM
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};
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enum latency_count {
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COUNTS_10e2 = 0, /* < 0.1us */
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COUNTS_10e3, /* 0.1us ~ 1us */
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COUNTS_10e4, /* 1us ~ 10us */
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COUNTS_10e5, /* 10us ~ 100us */
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COUNTS_10e6, /* 100us ~ 1ms */
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COUNTS_10e7, /* 1ms ~ 10ms */
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COUNTS_10e8_plus, /* 10ms and plus*/
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COUNTS_MIN,
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COUNTS_MAX,
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COUNTS_SUM,
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COUNTS_NUM
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};
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struct latency_statistic {
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bool enabled;
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u64 counter[COUNTS_NUM];
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u64 samples;
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};
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#ifdef CONFIG_DMAR_PERF
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int dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type);
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void dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type);
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bool dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type);
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void dmar_latency_update(struct intel_iommu *iommu, enum latency_type type,
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u64 latency);
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int dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size);
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#else
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static inline int
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dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type)
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{
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return -EINVAL;
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}
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static inline void
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dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type)
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{
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}
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static inline bool
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dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type)
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{
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return false;
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}
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static inline void
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dmar_latency_update(struct intel_iommu *iommu, enum latency_type type, u64 latency)
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{
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}
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static inline int
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dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size)
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{
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return 0;
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}
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#endif /* CONFIG_DMAR_PERF */
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