1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2014 Google, Inc.
12 DECLARE_GLOBAL_DATA_PTR;
15 * struct iotrace - current trace status and checksum
17 * @start: Start address of iotrace buffer
18 * @size: Actual size of iotrace buffer in bytes
19 * @needed_size: Needed of iotrace buffer in bytes
20 * @offset: Current write offset into iotrace buffer
21 * @region_start: Address of IO region to trace
22 * @region_size: Size of region to trace. if 0 will trace all address space
23 * @crc32: Current value of CRC chceksum of trace records
24 * @enabled: true if enabled, false if disabled
26 static struct iotrace {
37 static void add_record(int flags, const void *ptr, ulong value)
39 struct iotrace_record srec, *rec = &srec;
42 * We don't support iotrace before relocation. Since the trace buffer
43 * is set up by a command, it can't be enabled at present. To change
44 * this we would need to set the iotrace buffer at build-time. See
45 * lib/trace.c for how this might be done if you are interested.
47 if (!(gd->flags & GD_FLG_RELOC) || !iotrace.enabled)
50 if (iotrace.region_size)
51 if ((ulong)ptr < iotrace.region_start ||
52 (ulong)ptr > iotrace.region_start + iotrace.region_size)
55 /* Store it if there is room */
56 if (iotrace.offset + sizeof(*rec) < iotrace.size) {
57 rec = (struct iotrace_record *)map_sysmem(
58 iotrace.start + iotrace.offset,
61 WARN_ONCE(1, "WARNING: iotrace buffer exhausted, please check needed length using \"iotrace stats\"\n");
62 iotrace.needed_size += sizeof(struct iotrace_record);
66 rec->timestamp = timer_get_us();
68 rec->addr = map_to_sysmem(ptr);
71 /* Update our checksum */
72 iotrace.crc32 = crc32(iotrace.crc32, (unsigned char *)rec,
75 iotrace.needed_size += sizeof(struct iotrace_record);
76 iotrace.offset += sizeof(struct iotrace_record);
79 u32 iotrace_readl(const void *ptr)
84 add_record(IOT_32 | IOT_READ, ptr, v);
89 void iotrace_writel(ulong value, const void *ptr)
91 add_record(IOT_32 | IOT_WRITE, ptr, value);
95 u16 iotrace_readw(const void *ptr)
100 add_record(IOT_16 | IOT_READ, ptr, v);
105 void iotrace_writew(ulong value, const void *ptr)
107 add_record(IOT_16 | IOT_WRITE, ptr, value);
111 u8 iotrace_readb(const void *ptr)
116 add_record(IOT_8 | IOT_READ, ptr, v);
121 void iotrace_writeb(ulong value, const void *ptr)
123 add_record(IOT_8 | IOT_WRITE, ptr, value);
127 void iotrace_reset_checksum(void)
132 u32 iotrace_get_checksum(void)
134 return iotrace.crc32;
137 void iotrace_set_region(ulong start, ulong size)
139 iotrace.region_start = start;
140 iotrace.region_size = size;
143 void iotrace_reset_region(void)
145 iotrace.region_start = 0;
146 iotrace.region_size = 0;
149 void iotrace_get_region(ulong *start, ulong *size)
151 *start = iotrace.region_start;
152 *size = iotrace.region_size;
155 void iotrace_set_enabled(int enable)
157 iotrace.enabled = enable;
160 int iotrace_get_enabled(void)
162 return iotrace.enabled;
165 void iotrace_set_buffer(ulong start, ulong size)
167 iotrace.start = start;
173 void iotrace_get_buffer(ulong *start, ulong *size, ulong *needed_size, ulong *offset, ulong *count)
175 *start = iotrace.start;
176 *size = iotrace.size;
177 *needed_size = iotrace.needed_size;
178 *offset = iotrace.offset;
179 *count = iotrace.offset / sizeof(struct iotrace_record);