iotrace.c
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/*
* Copyright (c) 2014 Google, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#define IOTRACE_IMPL
#include <common.h>
#include <mapmem.h>
#include <asm/io.h>
DECLARE_GLOBAL_DATA_PTR;
/* Support up to the machine word length for now */
typedef ulong iovalue_t;
enum iotrace_flags {
IOT_8 = 0,
IOT_16,
IOT_32,
IOT_READ = 0 << 3,
IOT_WRITE = 1 << 3,
};
/**
* struct iotrace_record - Holds a single I/O trace record
*
* @flags: I/O access type
* @addr: Address of access
* @value: Value written or read
*/
struct iotrace_record {
enum iotrace_flags flags;
phys_addr_t addr;
iovalue_t value;
};
/**
* struct iotrace - current trace status and checksum
*
* @start: Start address of iotrace buffer
* @size: Size of iotrace buffer in bytes
* @offset: Current write offset into iotrace buffer
* @crc32: Current value of CRC chceksum of trace records
* @enabled: true if enabled, false if disabled
*/
static struct iotrace {
ulong start;
ulong size;
ulong offset;
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;
/* 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));
}
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.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, const 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, const 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, const 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_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 *offset, ulong *count)
{
*start = iotrace.start;
*size = iotrace.size;
*offset = iotrace.offset;
*count = iotrace.offset / sizeof(struct iotrace_record);
}