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75c02a0376
snprintf() returns the number of bytes that would have been written, not the number actually written. Using this for offset tracking can cause buffer overruns if truncation occurs. Replace snprintf() with scnprintf() to ensure the offset stays within bounds. Since scnprintf() never returns a negative value, and zero is not possible in this context because 'bytes' starts at 0 and 'size - bytes' is DEBUG_BUFFER_SIZE in the first call, which is large enough to hold the string literals used, the return value is always positive. An integer overflow is also completely out of reach here due to the small and fixed buffer size. The error check in latency_show_one() is therefore unnecessary. Remove it and make dmar_latency_snapshot() return void. Signed-off-by: Seyediman Seyedarab <ImanDevel@gmail.com> Link: https://lore.kernel.org/r/20250731225048.131364-1-ImanDevel@gmail.com Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/* 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_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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void 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 void
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dmar_latency_snapshot(struct intel_iommu *iommu, char *str, size_t size)
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{
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}
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#endif /* CONFIG_DMAR_PERF */
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