1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * perf.h - performance monitor header
4 *
5 * Copyright (C) 2021 Intel Corporation
6 *
7 * Author: Lu Baolu <baolu.lu@linux.intel.com>
8 */
9
10enum latency_type {
11 DMAR_LATENCY_INV_IOTLB = 0,
12 DMAR_LATENCY_INV_DEVTLB,
13 DMAR_LATENCY_INV_IEC,
14 DMAR_LATENCY_PRQ,
15 DMAR_LATENCY_NUM
16};
17
18enum latency_count {
19 COUNTS_10e2 = 0, /* < 0.1us */
20 COUNTS_10e3, /* 0.1us ~ 1us */
21 COUNTS_10e4, /* 1us ~ 10us */
22 COUNTS_10e5, /* 10us ~ 100us */
23 COUNTS_10e6, /* 100us ~ 1ms */
24 COUNTS_10e7, /* 1ms ~ 10ms */
25 COUNTS_10e8_plus, /* 10ms and plus*/
26 COUNTS_MIN,
27 COUNTS_MAX,
28 COUNTS_SUM,
29 COUNTS_NUM
30};
31
32struct latency_statistic {
33 bool enabled;
34 u64 counter[COUNTS_NUM];
35 u64 samples;
36};
37
38#ifdef CONFIG_DMAR_PERF
39int dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type);
40void dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type);
41bool dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type);
42void dmar_latency_update(struct intel_iommu *iommu, enum latency_type type,
43 u64 latency);
44int dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size);
45#else
46static inline int
47dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type)
48{
49 return -EINVAL;
50}
51
52static inline void
53dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type)
54{
55}
56
57static inline bool
58dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type)
59{
60 return false;
61}
62
63static inline void
64dmar_latency_update(struct intel_iommu *iommu, enum latency_type type, u64 latency)
65{
66}
67
68static inline int
69dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size)
70{
71 return 0;
72}
73#endif /* CONFIG_DMAR_PERF */
74

source code of linux/drivers/iommu/intel/perf.h