157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2014 Google, Inc.
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*/
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#ifndef __IOTRACE_H
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#define __IOTRACE_H
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//#include <common.h>
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#include <linux/types.h>
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/* Support up to the machine word length for now */
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typedef ulong iovalue_t;
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enum iotrace_flags {
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IOT_8 = 0,
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IOT_16,
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IOT_32,
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IOT_READ = 0 << 3,
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IOT_WRITE = 1 << 3,
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};
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/**
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* struct iotrace_record - Holds a single I/O trace record
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*
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* @flags: I/O access type
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* @timestamp: Timestamp of access
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* @addr: Address of access
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* @value: Value written or read
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*/
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struct iotrace_record {
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enum iotrace_flags flags;
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u64 timestamp;
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phys_addr_t addr;
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iovalue_t value;
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};
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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, (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, (void *)(addr))
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#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, (void *)(uintptr_t)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, void *ptr);
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u16 iotrace_readw(const void *ptr);
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void iotrace_writew(ulong value, void *ptr);
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u8 iotrace_readb(const void *ptr);
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void iotrace_writeb(ulong value, 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_region() - Set whether iotrace is limited to a specific
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* io region.
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*
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* Defines the address and size of the limited region.
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*
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* @start: address of the beginning of the region
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* @size: size of the region in bytes.
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*/
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void iotrace_set_region(ulong start, ulong size);
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/**
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* iotrace_reset_region() - Reset the region limit
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*/
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void iotrace_reset_region(void);
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/**
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* iotrace_get_region() - Get region information
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*
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* @start: Returns start address of region
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* @size: Returns size of region in bytes
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*/
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void iotrace_get_region(ulong *start, ulong *size);
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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 actual size of buffer in bytes
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* @needed_size: Returns needed 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 *needed_size, ulong *offset, ulong *count);
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#endif /* __IOTRACE_H */
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