drivers/iommu/intel/perf.h

   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_NUM
  15 };
  16
  17 enum 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
  31 struct latency_statistic {
  32         bool enabled;
  33         u64 counter[COUNTS_NUM];
  34         u64 samples;
  35 };
  36
  37 #ifdef CONFIG_DMAR_PERF
  38 int dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type);
  39 void dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type);
  40 bool dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type);
  41 void dmar_latency_update(struct intel_iommu *iommu, enum latency_type type,
  42                          u64 latency);
  43 int dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size);
  44 #else
  45 static inline int
  46 dmar_latency_enable(struct intel_iommu *iommu, enum latency_type type)
  47 {
  48         return -EINVAL;
  49 }
  50
  51 static inline void
  52 dmar_latency_disable(struct intel_iommu *iommu, enum latency_type type)
  53 {
  54 }
  55
  56 static inline bool
  57 dmar_latency_enabled(struct intel_iommu *iommu, enum latency_type type)
  58 {
  59         return false;
  60 }
  61
  62 static inline void
  63 dmar_latency_update(struct intel_iommu *iommu, enum latency_type type, u64 latency)
  64 {
  65 }
  66
  67 static inline int
  68 dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size)
  69 {
  70         return 0;
  71 }
  72 #endif /* CONFIG_DMAR_PERF */