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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2014 Google, Inc.
*/
#ifndef __IOTRACE_H
#define __IOTRACE_H
#include <linux/types.h>
/* Support up to the machine word length for now */
typedef ulong iovalue_t;
enum iotrace_flags {
IOT_8 = 0,
IOT_16,
IOT_32,
IOT_READ = 0 << 3,
IOT_WRITE = 1 << 3,
};
/**
* struct iotrace_record - Holds a single I/O trace record
*
* @flags: I/O access type
* @timestamp: Timestamp of access
* @addr: Address of access
* @value: Value written or read
*/
struct iotrace_record {
enum iotrace_flags flags;
u64 timestamp;
phys_addr_t addr;
iovalue_t value;
};
/*
* 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, (void *)(addr))
#undef readw
#define readw(addr) iotrace_readw((const void *)(addr))
#undef writew
#define writew(val, addr) iotrace_writew(val, (void *)(addr))
#undef readb
#define readb(addr) iotrace_readb((const void *)(uintptr_t)addr)
#undef writeb
#define writeb(val, addr) iotrace_writeb(val, (void *)(uintptr_t)addr)
#endif
/* Tracing functions which mirror their io.h counterparts */
u32 iotrace_readl(const void *ptr);
void iotrace_writel(ulong value, void *ptr);
u16 iotrace_readw(const void *ptr);
void iotrace_writew(ulong value, void *ptr);
u8 iotrace_readb(const void *ptr);
void iotrace_writeb(ulong value, 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_region() - Set whether iotrace is limited to a specific
* io region.
*
* Defines the address and size of the limited region.
*
* @start: address of the beginning of the region
* @size: size of the region in bytes.
*/
void iotrace_set_region(ulong start, ulong size);
/**
* iotrace_reset_region() - Reset the region limit
*/
void iotrace_reset_region(void);
/**
* iotrace_get_region() - Get region information
*
* @start: Returns start address of region
* @size: Returns size of region in bytes
*/
void iotrace_get_region(ulong *start, ulong *size);
/**
* 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 actual size of buffer in bytes
* @needed_size: Returns needed 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 *needed_size, ulong *offset, ulong *count);
#endif /* __IOTRACE_H */
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