1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2014 Google, Inc.
10 #include <linux/types.h>
12 /* Support up to the machine word length for now */
13 typedef ulong iovalue_t;
25 * struct iotrace_record - Holds a single I/O trace record
27 * @flags: I/O access type
28 * @timestamp: Timestamp of access
29 * @addr: Address of access
30 * @value: Value written or read
32 struct iotrace_record {
33 enum iotrace_flags flags;
40 * This file is designed to be included in arch/<arch>/include/asm/io.h.
41 * It redirects all IO access through a tracing/checksumming feature for
45 #if defined(CONFIG_IO_TRACE) && !defined(IOTRACE_IMPL) && \
46 !defined(CONFIG_SPL_BUILD)
49 #define readl(addr) iotrace_readl((const void *)(addr))
52 #define writel(val, addr) iotrace_writel(val, (void *)(addr))
55 #define readw(addr) iotrace_readw((const void *)(addr))
58 #define writew(val, addr) iotrace_writew(val, (void *)(addr))
61 #define readb(addr) iotrace_readb((const void *)(uintptr_t)addr)
64 #define writeb(val, addr) iotrace_writeb(val, (void *)(uintptr_t)addr)
68 /* Tracing functions which mirror their io.h counterparts */
69 u32 iotrace_readl(const void *ptr);
70 void iotrace_writel(ulong value, void *ptr);
71 u16 iotrace_readw(const void *ptr);
72 void iotrace_writew(ulong value, void *ptr);
73 u8 iotrace_readb(const void *ptr);
74 void iotrace_writeb(ulong value, void *ptr);
77 * iotrace_reset_checksum() - Reset the iotrace checksum
79 void iotrace_reset_checksum(void);
82 * iotrace_get_checksum() - Get the current checksum value
84 * Return: currect checksum value
86 u32 iotrace_get_checksum(void);
89 * iotrace_set_region() - Set whether iotrace is limited to a specific
92 * Defines the address and size of the limited region.
94 * @start: address of the beginning of the region
95 * @size: size of the region in bytes.
97 void iotrace_set_region(ulong start, ulong size);
100 * iotrace_reset_region() - Reset the region limit
102 void iotrace_reset_region(void);
105 * iotrace_get_region() - Get region information
107 * @start: Returns start address of region
108 * @size: Returns size of region in bytes
110 void iotrace_get_region(ulong *start, ulong *size);
113 * iotrace_set_enabled() - Set whether iotracing is enabled or not
115 * This controls whether the checksum is updated and a trace record added
116 * for each I/O access.
118 * @enable: true to enable iotracing, false to disable
120 void iotrace_set_enabled(int enable);
123 * iotrace_get_enabled() - Get whether iotracing is enabled or not
125 * Return: true if enabled, false if disabled
127 int iotrace_get_enabled(void);
130 * iotrace_set_buffer() - Set position and size of iotrace buffer
132 * Defines where the iotrace buffer goes, and resets the output pointer to
133 * the start of the buffer.
135 * The buffer can be 0 size in which case the checksum is updated but no
136 * trace records are writen. If the buffer is exhausted, the offset will
137 * continue to increase but not new data will be written.
139 * @start: Start address of buffer
140 * @size: Size of buffer in bytes
142 void iotrace_set_buffer(ulong start, ulong size);
145 * iotrace_get_buffer() - Get buffer information
147 * @start: Returns start address of buffer
148 * @size: Returns actual size of buffer in bytes
149 * @needed_size: Returns needed size of buffer in bytes
150 * @offset: Returns the byte offset where the next output trace record will
151 * @count: Returns the number of trace records recorded
152 * be written (or would be if the buffer was large enough)
154 void iotrace_get_buffer(ulong *start, ulong *size, ulong *needed_size, ulong *offset, ulong *count);
156 #endif /* __IOTRACE_H */