105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
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/*
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* Copyright (c) 2014 Google, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __IOTRACE_H
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#define __IOTRACE_H
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#include <linux/types.h>
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/*
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* This file is designed to be included in arch/<arch>/include/asm/io.h.
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* It redirects all IO access through a tracing/checksumming feature for
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* testing purposes.
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*/
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#if defined(CONFIG_IO_TRACE) && !defined(IOTRACE_IMPL) && \
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!defined(CONFIG_SPL_BUILD)
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#undef readl
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#define readl(addr) iotrace_readl((const void *)(addr))
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#undef writel
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#define writel(val, addr) iotrace_writel(val, (const void *)(addr))
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#undef readw
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#define readw(addr) iotrace_readw((const void *)(addr))
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#undef writew
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#define writew(val, addr) iotrace_writew(val, (const void *)(addr))
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#undef readb
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#define readb(addr) iotrace_readb((const void *)(addr))
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#undef writeb
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#define writeb(val, addr) iotrace_writeb(val, (const void *)(addr))
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#endif
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/* Tracing functions which mirror their io.h counterparts */
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u32 iotrace_readl(const void *ptr);
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void iotrace_writel(ulong value, const void *ptr);
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u16 iotrace_readw(const void *ptr);
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void iotrace_writew(ulong value, const void *ptr);
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u8 iotrace_readb(const void *ptr);
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void iotrace_writeb(ulong value, const void *ptr);
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/**
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* iotrace_reset_checksum() - Reset the iotrace checksum
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*/
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void iotrace_reset_checksum(void);
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/**
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* iotrace_get_checksum() - Get the current checksum value
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*
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* @return currect checksum value
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*/
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u32 iotrace_get_checksum(void);
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/**
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* iotrace_set_enabled() - Set whether iotracing is enabled or not
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*
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* This controls whether the checksum is updated and a trace record added
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* for each I/O access.
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*
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* @enable: true to enable iotracing, false to disable
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*/
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void iotrace_set_enabled(int enable);
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/**
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* iotrace_get_enabled() - Get whether iotracing is enabled or not
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*
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* @return true if enabled, false if disabled
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*/
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int iotrace_get_enabled(void);
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/**
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* iotrace_set_buffer() - Set position and size of iotrace buffer
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*
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* Defines where the iotrace buffer goes, and resets the output pointer to
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* the start of the buffer.
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*
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* The buffer can be 0 size in which case the checksum is updated but no
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* trace records are writen. If the buffer is exhausted, the offset will
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* continue to increase but not new data will be written.
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*
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* @start: Start address of buffer
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* @size: Size of buffer in bytes
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*/
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void iotrace_set_buffer(ulong start, ulong size);
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/**
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* iotrace_get_buffer() - Get buffer information
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*
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* @start: Returns start address of buffer
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* @size: Returns size of buffer in bytes
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* @offset: Returns the byte offset where the next output trace record will
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* @count: Returns the number of trace records recorded
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* be written (or would be if the buffer was large enough)
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*/
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void iotrace_get_buffer(ulong *start, ulong *size, ulong *offset, ulong *count);
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#endif /* __IOTRACE_H */
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