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
10 enum 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
18 enum 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
32 struct latency_statistic {
33 bool enabled;
34 u64 counter[COUNTS_NUM];
35 u64 samples;
36 };
37
38 #ifdef CONFIG_DMAR_PERF
39 int dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type);
40 void dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type);
41 bool dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type);
42 void dmar_latency_update(struct intel_iommu *iommu, enum latency_type type,
43 u64 latency);
44 int dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size);
45 #else
46 static inline int
dmar_latency_enable(struct intel_iommu * iommu,enum latency_type type)47 dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type)
48 {
49 return -EINVAL;
50 }
51
52 static inline void
dmar_latency_disable(struct intel_iommu * iommu,enum latency_type type)53 dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type)
54 {
55 }
56
57 static inline bool
dmar_latency_enabled(struct intel_iommu * iommu,enum latency_type type)58 dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type)
59 {
60 return false;
61 }
62
63 static inline void
dmar_latency_update(struct intel_iommu * iommu,enum latency_type type,u64 latency)64 dmar_latency_update(struct intel_iommu *iommu, enum latency_type type, u64 latency)
65 {
66 }
67
68 static inline int
dmar_latency_snapshot(struct intel_iommu * iommu,char * str,size_t size)69 dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size)
70 {
71 return 0;
72 }
73 #endif /* CONFIG_DMAR_PERF */
74