iotrace.c
3.79 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2014 Google, Inc.
*/
#define IOTRACE_IMPL
#include <common.h>
#include <mapmem.h>
#include <time.h>
#include <asm/io.h>
#include <u-boot/crc.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* struct iotrace - current trace status and checksum
*
* @start: Start address of iotrace buffer
* @size: Actual size of iotrace buffer in bytes
* @needed_size: Needed of iotrace buffer in bytes
* @offset: Current write offset into iotrace buffer
* @region_start: Address of IO region to trace
* @region_size: Size of region to trace. if 0 will trace all address space
* @crc32: Current value of CRC chceksum of trace records
* @enabled: true if enabled, false if disabled
*/
static struct iotrace {
ulong start;
ulong size;
ulong needed_size;
ulong offset;
ulong region_start;
ulong region_size;
u32 crc32;
bool enabled;
} iotrace;
static void add_record(int flags, const void *ptr, ulong value)
{
struct iotrace_record srec, *rec = &srec;
/*
* We don't support iotrace before relocation. Since the trace buffer
* is set up by a command, it can't be enabled at present. To change
* this we would need to set the iotrace buffer at build-time. See
* lib/trace.c for how this might be done if you are interested.
*/
if (!(gd->flags & GD_FLG_RELOC) || !iotrace.enabled)
return;
if (iotrace.region_size)
if ((ulong)ptr < iotrace.region_start ||
(ulong)ptr > iotrace.region_start + iotrace.region_size)
return;
/* Store it if there is room */
if (iotrace.offset + sizeof(*rec) < iotrace.size) {
rec = (struct iotrace_record *)map_sysmem(
iotrace.start + iotrace.offset,
sizeof(value));
} else {
WARN_ONCE(1, "WARNING: iotrace buffer exhausted, please check needed length using \"iotrace stats\"\n");
iotrace.needed_size += sizeof(struct iotrace_record);
return;
}
rec->timestamp = timer_get_us();
rec->flags = flags;
rec->addr = map_to_sysmem(ptr);
rec->value = value;
/* Update our checksum */
iotrace.crc32 = crc32(iotrace.crc32, (unsigned char *)rec,
sizeof(*rec));
iotrace.needed_size += sizeof(struct iotrace_record);
iotrace.offset += sizeof(struct iotrace_record);
}
u32 iotrace_readl(const void *ptr)
{
u32 v;
v = readl(ptr);
add_record(IOT_32 | IOT_READ, ptr, v);
return v;
}
void iotrace_writel(ulong value, void *ptr)
{
add_record(IOT_32 | IOT_WRITE, ptr, value);
writel(value, ptr);
}
u16 iotrace_readw(const void *ptr)
{
u32 v;
v = readw(ptr);
add_record(IOT_16 | IOT_READ, ptr, v);
return v;
}
void iotrace_writew(ulong value, void *ptr)
{
add_record(IOT_16 | IOT_WRITE, ptr, value);
writew(value, ptr);
}
u8 iotrace_readb(const void *ptr)
{
u32 v;
v = readb(ptr);
add_record(IOT_8 | IOT_READ, ptr, v);
return v;
}
void iotrace_writeb(ulong value, void *ptr)
{
add_record(IOT_8 | IOT_WRITE, ptr, value);
writeb(value, ptr);
}
void iotrace_reset_checksum(void)
{
iotrace.crc32 = 0;
}
u32 iotrace_get_checksum(void)
{
return iotrace.crc32;
}
void iotrace_set_region(ulong start, ulong size)
{
iotrace.region_start = start;
iotrace.region_size = size;
}
void iotrace_reset_region(void)
{
iotrace.region_start = 0;
iotrace.region_size = 0;
}
void iotrace_get_region(ulong *start, ulong *size)
{
*start = iotrace.region_start;
*size = iotrace.region_size;
}
void iotrace_set_enabled(int enable)
{
iotrace.enabled = enable;
}
int iotrace_get_enabled(void)
{
return iotrace.enabled;
}
void iotrace_set_buffer(ulong start, ulong size)
{
iotrace.start = start;
iotrace.size = size;
iotrace.offset = 0;
iotrace.crc32 = 0;
}
void iotrace_get_buffer(ulong *start, ulong *size, ulong *needed_size, ulong *offset, ulong *count)
{
*start = iotrace.start;
*size = iotrace.size;
*needed_size = iotrace.needed_size;
*offset = iotrace.offset;
*count = iotrace.offset / sizeof(struct iotrace_record);
}