170 lines
3.2 KiB
C
170 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2014 Google, Inc.
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*/
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#define IOTRACE_IMPL
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#include <common.h>
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#include <mapmem.h>
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#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Support up to the machine word length for now */
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typedef ulong iovalue_t;
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enum iotrace_flags {
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IOT_8 = 0,
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IOT_16,
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IOT_32,
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IOT_READ = 0 << 3,
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IOT_WRITE = 1 << 3,
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};
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/**
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* struct iotrace_record - Holds a single I/O trace record
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*
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* @flags: I/O access type
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* @addr: Address of access
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* @value: Value written or read
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*/
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struct iotrace_record {
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enum iotrace_flags flags;
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phys_addr_t addr;
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iovalue_t value;
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};
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/**
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* struct iotrace - current trace status and checksum
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*
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* @start: Start address of iotrace buffer
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* @size: Size of iotrace buffer in bytes
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* @offset: Current write offset into iotrace buffer
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* @crc32: Current value of CRC chceksum of trace records
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* @enabled: true if enabled, false if disabled
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*/
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static struct iotrace {
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ulong start;
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ulong size;
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ulong offset;
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u32 crc32;
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bool enabled;
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} iotrace;
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static void add_record(int flags, const void *ptr, ulong value)
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{
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struct iotrace_record srec, *rec = &srec;
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/*
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* We don't support iotrace before relocation. Since the trace buffer
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* is set up by a command, it can't be enabled at present. To change
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* this we would need to set the iotrace buffer at build-time. See
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* lib/trace.c for how this might be done if you are interested.
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*/
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if (!(gd->flags & GD_FLG_RELOC) || !iotrace.enabled)
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return;
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/* Store it if there is room */
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if (iotrace.offset + sizeof(*rec) < iotrace.size) {
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rec = (struct iotrace_record *)map_sysmem(
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iotrace.start + iotrace.offset,
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sizeof(value));
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}
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rec->flags = flags;
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rec->addr = map_to_sysmem(ptr);
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rec->value = value;
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/* Update our checksum */
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iotrace.crc32 = crc32(iotrace.crc32, (unsigned char *)rec,
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sizeof(*rec));
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iotrace.offset += sizeof(struct iotrace_record);
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}
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u32 iotrace_readl(const void *ptr)
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{
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u32 v;
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v = readl(ptr);
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add_record(IOT_32 | IOT_READ, ptr, v);
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return v;
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}
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void iotrace_writel(ulong value, const void *ptr)
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{
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add_record(IOT_32 | IOT_WRITE, ptr, value);
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writel(value, ptr);
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}
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u16 iotrace_readw(const void *ptr)
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{
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u32 v;
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v = readw(ptr);
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add_record(IOT_16 | IOT_READ, ptr, v);
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return v;
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}
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void iotrace_writew(ulong value, const void *ptr)
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{
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add_record(IOT_16 | IOT_WRITE, ptr, value);
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writew(value, ptr);
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}
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u8 iotrace_readb(const void *ptr)
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{
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u32 v;
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v = readb(ptr);
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add_record(IOT_8 | IOT_READ, ptr, v);
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return v;
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}
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void iotrace_writeb(ulong value, const void *ptr)
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{
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add_record(IOT_8 | IOT_WRITE, ptr, value);
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writeb(value, ptr);
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}
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void iotrace_reset_checksum(void)
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{
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iotrace.crc32 = 0;
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}
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u32 iotrace_get_checksum(void)
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{
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return iotrace.crc32;
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}
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void iotrace_set_enabled(int enable)
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{
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iotrace.enabled = enable;
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}
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int iotrace_get_enabled(void)
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{
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return iotrace.enabled;
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}
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void iotrace_set_buffer(ulong start, ulong size)
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{
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iotrace.start = start;
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iotrace.size = size;
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iotrace.offset = 0;
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iotrace.crc32 = 0;
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}
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void iotrace_get_buffer(ulong *start, ulong *size, ulong *offset, ulong *count)
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{
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*start = iotrace.start;
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*size = iotrace.size;
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*offset = iotrace.offset;
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*count = iotrace.offset / sizeof(struct iotrace_record);
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}
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