1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2014 Google, Inc.
12 #include <u-boot/crc.h>
14 DECLARE_GLOBAL_DATA_PTR;
17 * struct iotrace - current trace status and checksum
19 * @start: Start address of iotrace buffer
20 * @size: Actual size of iotrace buffer in bytes
21 * @needed_size: Needed of iotrace buffer in bytes
22 * @offset: Current write offset into iotrace buffer
23 * @region_start: Address of IO region to trace
24 * @region_size: Size of region to trace. if 0 will trace all address space
25 * @crc32: Current value of CRC chceksum of trace records
26 * @enabled: true if enabled, false if disabled
28 static struct iotrace {
39 static void add_record(int flags, const void *ptr, ulong value)
41 struct iotrace_record srec, *rec = &srec;
44 * We don't support iotrace before relocation. Since the trace buffer
45 * is set up by a command, it can't be enabled at present. To change
46 * this we would need to set the iotrace buffer at build-time. See
47 * lib/trace.c for how this might be done if you are interested.
49 if (!(gd->flags & GD_FLG_RELOC) || !iotrace.enabled)
52 if (iotrace.region_size)
53 if ((ulong)ptr < iotrace.region_start ||
54 (ulong)ptr > iotrace.region_start + iotrace.region_size)
57 /* Store it if there is room */
58 if (iotrace.offset + sizeof(*rec) < iotrace.size) {
59 rec = (struct iotrace_record *)map_sysmem(
60 iotrace.start + iotrace.offset,
63 WARN_ONCE(1, "WARNING: iotrace buffer exhausted, please check needed length using \"iotrace stats\"\n");
64 iotrace.needed_size += sizeof(struct iotrace_record);
68 rec->timestamp = timer_get_us();
70 rec->addr = map_to_sysmem(ptr);
73 /* Update our checksum */
74 iotrace.crc32 = crc32(iotrace.crc32, (unsigned char *)rec,
77 iotrace.needed_size += sizeof(struct iotrace_record);
78 iotrace.offset += sizeof(struct iotrace_record);
81 u32 iotrace_readl(const void *ptr)
86 add_record(IOT_32 | IOT_READ, ptr, v);
91 void iotrace_writel(ulong value, void *ptr)
93 add_record(IOT_32 | IOT_WRITE, ptr, value);
97 u16 iotrace_readw(const void *ptr)
102 add_record(IOT_16 | IOT_READ, ptr, v);
107 void iotrace_writew(ulong value, void *ptr)
109 add_record(IOT_16 | IOT_WRITE, ptr, value);
113 u8 iotrace_readb(const void *ptr)
118 add_record(IOT_8 | IOT_READ, ptr, v);
123 void iotrace_writeb(ulong value, void *ptr)
125 add_record(IOT_8 | IOT_WRITE, ptr, value);
129 void iotrace_reset_checksum(void)
134 u32 iotrace_get_checksum(void)
136 return iotrace.crc32;
139 void iotrace_set_region(ulong start, ulong size)
141 iotrace.region_start = start;
142 iotrace.region_size = size;
145 void iotrace_reset_region(void)
147 iotrace.region_start = 0;
148 iotrace.region_size = 0;
151 void iotrace_get_region(ulong *start, ulong *size)
153 *start = iotrace.region_start;
154 *size = iotrace.region_size;
157 void iotrace_set_enabled(int enable)
159 iotrace.enabled = enable;
162 int iotrace_get_enabled(void)
164 return iotrace.enabled;
167 void iotrace_set_buffer(ulong start, ulong size)
169 iotrace.start = start;
175 void iotrace_get_buffer(ulong *start, ulong *size, ulong *needed_size, ulong *offset, ulong *count)
177 *start = iotrace.start;
178 *size = iotrace.size;
179 *needed_size = iotrace.needed_size;
180 *offset = iotrace.offset;
181 *count = iotrace.offset / sizeof(struct iotrace_record);