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