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_NUM
15};
16
17enum latency_count {
18 COUNTS_10e2 = 0, /* < 0.1us */
19 COUNTS_10e3, /* 0.1us ~ 1us */
20 COUNTS_10e4, /* 1us ~ 10us */
21 COUNTS_10e5, /* 10us ~ 100us */
22 COUNTS_10e6, /* 100us ~ 1ms */
23 COUNTS_10e7, /* 1ms ~ 10ms */
24 COUNTS_10e8_plus, /* 10ms and plus*/
25 COUNTS_MIN,
26 COUNTS_MAX,
27 COUNTS_SUM,
28 COUNTS_NUM
29};
30
31struct latency_statistic {
32 bool enabled;
33 u64 counter[COUNTS_NUM];
34 u64 samples;
35};
36
37#ifdef CONFIG_DMAR_PERF
38int dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type);
39void dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type);
40bool dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type);
41void dmar_latency_update(struct intel_iommu *iommu, enum latency_type type,
42 u64 latency);
43void dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size);
44#else
45static inline int
46dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type)
47{
48 return -EINVAL;
49}
50
51static inline void
52dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type)
53{
54}
55
56static inline bool
57dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type)
58{
59 return false;
60}
61
62static inline void
63dmar_latency_update(struct intel_iommu *iommu, enum latency_type type, u64 latency)
64{
65}
66
67static inline void
68dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size)
69{
70}
71#endif /* CONFIG_DMAR_PERF */
72