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, (const void *)(addr))
55 #define readw(addr) iotrace_readw((const void *)(addr))
58 #define writew(val, addr) iotrace_writew(val, (const void *)(addr))
61 #define readb(addr) iotrace_readb((const void *)(uintptr_t)addr)
64 #define writeb(val, addr) \
65 iotrace_writeb(val, (const void *)(uintptr_t)addr)
69 /* Tracing functions which mirror their io.h counterparts */
70 u32 iotrace_readl(const void *ptr);
71 void iotrace_writel(ulong value, const void *ptr);
72 u16 iotrace_readw(const void *ptr);
73 void iotrace_writew(ulong value, const void *ptr);
74 u8 iotrace_readb(const void *ptr);
75 void iotrace_writeb(ulong value, const void *ptr);
78 * iotrace_reset_checksum() - Reset the iotrace checksum
80 void iotrace_reset_checksum(void);
83 * iotrace_get_checksum() - Get the current checksum value
85 * @return currect checksum value
87 u32 iotrace_get_checksum(void);
90 * iotrace_set_region() - Set whether iotrace is limited to a specific
93 * Defines the address and size of the limited region.
95 * @start: address of the beginning of the region
96 * @size: size of the region in bytes.
98 void iotrace_set_region(ulong start, ulong size);
101 * iotrace_reset_region() - Reset the region limit
103 void iotrace_reset_region(void);
106 * iotrace_get_region() - Get region information
108 * @start: Returns start address of region
109 * @size: Returns size of region in bytes
111 void iotrace_get_region(ulong *start, ulong *size);
114 * iotrace_set_enabled() - Set whether iotracing is enabled or not
116 * This controls whether the checksum is updated and a trace record added
117 * for each I/O access.
119 * @enable: true to enable iotracing, false to disable
121 void iotrace_set_enabled(int enable);
124 * iotrace_get_enabled() - Get whether iotracing is enabled or not
126 * @return true if enabled, false if disabled
128 int iotrace_get_enabled(void);
131 * iotrace_set_buffer() - Set position and size of iotrace buffer
133 * Defines where the iotrace buffer goes, and resets the output pointer to
134 * the start of the buffer.
136 * The buffer can be 0 size in which case the checksum is updated but no
137 * trace records are writen. If the buffer is exhausted, the offset will
138 * continue to increase but not new data will be written.
140 * @start: Start address of buffer
141 * @size: Size of buffer in bytes
143 void iotrace_set_buffer(ulong start, ulong size);
146 * iotrace_get_buffer() - Get buffer information
148 * @start: Returns start address of buffer
149 * @size: Returns actual size of buffer in bytes
150 * @needed_size: Returns needed size of buffer in bytes
151 * @offset: Returns the byte offset where the next output trace record will
152 * @count: Returns the number of trace records recorded
153 * be written (or would be if the buffer was large enough)
155 void iotrace_get_buffer(ulong *start, ulong *size, ulong *needed_size, ulong *offset, ulong *count);
157 #endif /* __IOTRACE_H */