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include/iotrace.h
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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) && \ !defined(CONFIG_SPL_BUILD) #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 |
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#define readb(addr) iotrace_readb((const void *)(uintptr_t)addr) |
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#undef writeb |
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#define writeb(val, addr) \ iotrace_writeb(val, (const void *)(uintptr_t)addr) |
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#endif /* 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 */ |