Release 4.18 tools/perf/util/arm-spe-pkt-decoder.c
// SPDX-License-Identifier: GPL-2.0
/*
* Arm Statistical Profiling Extensions (SPE) support
* Copyright (c) 2017-2018, Arm Ltd.
*/
#include <stdio.h>
#include <string.h>
#include <endian.h>
#include <byteswap.h>
#include "arm-spe-pkt-decoder.h"
#define BIT(n) (1ULL << (n))
#define NS_FLAG BIT(63)
#define EL_FLAG (BIT(62) | BIT(61))
#define SPE_HEADER0_PAD 0x0
#define SPE_HEADER0_END 0x1
#define SPE_HEADER0_ADDRESS 0x30
/* address packet (short) */
#define SPE_HEADER0_ADDRESS_MASK 0x38
#define SPE_HEADER0_COUNTER 0x18
/* counter packet (short) */
#define SPE_HEADER0_COUNTER_MASK 0x38
#define SPE_HEADER0_TIMESTAMP 0x71
#define SPE_HEADER0_TIMESTAMP 0x71
#define SPE_HEADER0_EVENTS 0x2
#define SPE_HEADER0_EVENTS_MASK 0xf
#define SPE_HEADER0_SOURCE 0x3
#define SPE_HEADER0_SOURCE_MASK 0xf
#define SPE_HEADER0_CONTEXT 0x24
#define SPE_HEADER0_CONTEXT_MASK 0x3c
#define SPE_HEADER0_OP_TYPE 0x8
#define SPE_HEADER0_OP_TYPE_MASK 0x3c
#define SPE_HEADER1_ALIGNMENT 0x0
#define SPE_HEADER1_ADDRESS 0xb0
/* address packet (extended) */
#define SPE_HEADER1_ADDRESS_MASK 0xf8
#define SPE_HEADER1_COUNTER 0x98
/* counter packet (extended) */
#define SPE_HEADER1_COUNTER_MASK 0xf8
#if __BYTE_ORDER == __BIG_ENDIAN
#define le16_to_cpu bswap_16
#define le32_to_cpu bswap_32
#define le64_to_cpu bswap_64
#define memcpy_le64(d, s, n) do { \
memcpy((d), (s), (n)); \
*(d) = le64_to_cpu(*(d)); \
} while (0)
#else
#define le16_to_cpu
#define le32_to_cpu
#define le64_to_cpu
#define memcpy_le64 memcpy
#endif
static const char * const arm_spe_packet_name[] = {
[ARM_SPE_PAD] = "PAD",
[ARM_SPE_END] = "END",
[ARM_SPE_TIMESTAMP] = "TS",
[ARM_SPE_ADDRESS] = "ADDR",
[ARM_SPE_COUNTER] = "LAT",
[ARM_SPE_CONTEXT] = "CONTEXT",
[ARM_SPE_OP_TYPE] = "OP-TYPE",
[ARM_SPE_EVENTS] = "EVENTS",
[ARM_SPE_DATA_SOURCE] = "DATA-SOURCE",
};
const char *arm_spe_pkt_name(enum arm_spe_pkt_type type)
{
return arm_spe_packet_name[type];
}
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/* return ARM SPE payload size from its encoding,
* which is in bits 5:4 of the byte.
* 00 : byte
* 01 : halfword (2)
* 10 : word (4)
* 11 : doubleword (8)
*/
static int payloadlen(unsigned char byte)
{
return 1 << ((byte & 0x30) >> 4);
}
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static int arm_spe_get_payload(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
size_t payload_len = payloadlen(buf[0]);
if (len < 1 + payload_len)
return ARM_SPE_NEED_MORE_BYTES;
buf++;
switch (payload_len) {
case 1: packet->payload = *(uint8_t *)buf; break;
case 2: packet->payload = le16_to_cpu(*(uint16_t *)buf); break;
case 4: packet->payload = le32_to_cpu(*(uint32_t *)buf); break;
case 8: packet->payload = le64_to_cpu(*(uint64_t *)buf); break;
default: return ARM_SPE_BAD_PACKET;
}
return 1 + payload_len;
}
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static int arm_spe_get_pad(struct arm_spe_pkt *packet)
{
packet->type = ARM_SPE_PAD;
return 1;
}
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static int arm_spe_get_alignment(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
unsigned int alignment = 1 << ((buf[0] & 0xf) + 1);
if (len < alignment)
return ARM_SPE_NEED_MORE_BYTES;
packet->type = ARM_SPE_PAD;
return alignment - (((uintptr_t)buf) & (alignment - 1));
}
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static int arm_spe_get_end(struct arm_spe_pkt *packet)
{
packet->type = ARM_SPE_END;
return 1;
}
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static int arm_spe_get_timestamp(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
packet->type = ARM_SPE_TIMESTAMP;
return arm_spe_get_payload(buf, len, packet);
}
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static int arm_spe_get_events(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
int ret = arm_spe_get_payload(buf, len, packet);
packet->type = ARM_SPE_EVENTS;
/* we use index to identify Events with a less number of
* comparisons in arm_spe_pkt_desc(): E.g., the LLC-ACCESS,
* LLC-REFILL, and REMOTE-ACCESS events are identified iff
* index > 1.
*/
packet->index = ret - 1;
return ret;
}
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static int arm_spe_get_data_source(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
packet->type = ARM_SPE_DATA_SOURCE;
return arm_spe_get_payload(buf, len, packet);
}
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static int arm_spe_get_context(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
packet->type = ARM_SPE_CONTEXT;
packet->index = buf[0] & 0x3;
return arm_spe_get_payload(buf, len, packet);
}
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static int arm_spe_get_op_type(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
packet->type = ARM_SPE_OP_TYPE;
packet->index = buf[0] & 0x3;
return arm_spe_get_payload(buf, len, packet);
}
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static int arm_spe_get_counter(const unsigned char *buf, size_t len,
const unsigned char ext_hdr, struct arm_spe_pkt *packet)
{
if (len < 2)
return ARM_SPE_NEED_MORE_BYTES;
packet->type = ARM_SPE_COUNTER;
if (ext_hdr)
packet->index = ((buf[0] & 0x3) << 3) | (buf[1] & 0x7);
else
packet->index = buf[0] & 0x7;
packet->payload = le16_to_cpu(*(uint16_t *)(buf + 1));
return 1 + ext_hdr + 2;
}
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static int arm_spe_get_addr(const unsigned char *buf, size_t len,
const unsigned char ext_hdr, struct arm_spe_pkt *packet)
{
if (len < 8)
return ARM_SPE_NEED_MORE_BYTES;
packet->type = ARM_SPE_ADDRESS;
if (ext_hdr)
packet->index = ((buf[0] & 0x3) << 3) | (buf[1] & 0x7);
else
packet->index = buf[0] & 0x7;
memcpy_le64(&packet->payload, buf + 1, 8);
return 1 + ext_hdr + 8;
}
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static int arm_spe_do_get_packet(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
unsigned int byte;
memset(packet, 0, sizeof(struct arm_spe_pkt));
if (!len)
return ARM_SPE_NEED_MORE_BYTES;
byte = buf[0];
if (byte == SPE_HEADER0_PAD)
return arm_spe_get_pad(packet);
else if (byte == SPE_HEADER0_END) /* no timestamp at end of record */
return arm_spe_get_end(packet);
else if (byte & 0xc0 /* 0y11xxxxxx */) {
if (byte & 0x80) {
if ((byte & SPE_HEADER0_ADDRESS_MASK) == SPE_HEADER0_ADDRESS)
return arm_spe_get_addr(buf, len, 0, packet);
if ((byte & SPE_HEADER0_COUNTER_MASK) == SPE_HEADER0_COUNTER)
return arm_spe_get_counter(buf, len, 0, packet);
} else
if (byte == SPE_HEADER0_TIMESTAMP)
return arm_spe_get_timestamp(buf, len, packet);
else if ((byte & SPE_HEADER0_EVENTS_MASK) == SPE_HEADER0_EVENTS)
return arm_spe_get_events(buf, len, packet);
else if ((byte & SPE_HEADER0_SOURCE_MASK) == SPE_HEADER0_SOURCE)
return arm_spe_get_data_source(buf, len, packet);
else if ((byte & SPE_HEADER0_CONTEXT_MASK) == SPE_HEADER0_CONTEXT)
return arm_spe_get_context(buf, len, packet);
else if ((byte & SPE_HEADER0_OP_TYPE_MASK) == SPE_HEADER0_OP_TYPE)
return arm_spe_get_op_type(buf, len, packet);
} else if ((byte & 0xe0) == 0x20 /* 0y001xxxxx */) {
/* 16-bit header */
byte = buf[1];
if (byte == SPE_HEADER1_ALIGNMENT)
return arm_spe_get_alignment(buf, len, packet);
else if ((byte & SPE_HEADER1_ADDRESS_MASK) == SPE_HEADER1_ADDRESS)
return arm_spe_get_addr(buf, len, 1, packet);
else if ((byte & SPE_HEADER1_COUNTER_MASK) == SPE_HEADER1_COUNTER)
return arm_spe_get_counter(buf, len, 1, packet);
}
return ARM_SPE_BAD_PACKET;
}
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int arm_spe_get_packet(const unsigned char *buf, size_t len,
struct arm_spe_pkt *packet)
{
int ret;
ret = arm_spe_do_get_packet(buf, len, packet);
/* put multiple consecutive PADs on the same line, up to
* the fixed-width output format of 16 bytes per line.
*/
if (ret > 0 && packet->type == ARM_SPE_PAD) {
while (ret < 16 && len > (size_t)ret && !buf[ret])
ret += 1;
}
return ret;
}
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int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
size_t buf_len)
{
int ret, ns, el, idx = packet->index;
unsigned long long payload = packet->payload;
const char *name = arm_spe_pkt_name(packet->type);
switch (packet->type) {
case ARM_SPE_BAD:
case ARM_SPE_PAD:
case ARM_SPE_END:
return snprintf(buf, buf_len, "%s", name);
case ARM_SPE_EVENTS: {
size_t blen = buf_len;
ret = 0;
ret = snprintf(buf, buf_len, "EV");
buf += ret;
blen -= ret;
if (payload & 0x1) {
ret = snprintf(buf, buf_len, " EXCEPTION-GEN");
buf += ret;
blen -= ret;
}
if (payload & 0x2) {
ret = snprintf(buf, buf_len, " RETIRED");
buf += ret;
blen -= ret;
}
if (payload & 0x4) {
ret = snprintf(buf, buf_len, " L1D-ACCESS");
buf += ret;
blen -= ret;
}
if (payload & 0x8) {
ret = snprintf(buf, buf_len, " L1D-REFILL");
buf += ret;
blen -= ret;
}
if (payload & 0x10) {
ret = snprintf(buf, buf_len, " TLB-ACCESS");
buf += ret;
blen -= ret;
}
if (payload & 0x20) {
ret = snprintf(buf, buf_len, " TLB-REFILL");
buf += ret;
blen -= ret;
}
if (payload & 0x40) {
ret = snprintf(buf, buf_len, " NOT-TAKEN");
buf += ret;
blen -= ret;
}
if (payload & 0x80) {
ret = snprintf(buf, buf_len, " MISPRED");
buf += ret;
blen -= ret;
}
if (idx > 1) {
if (payload & 0x100) {
ret = snprintf(buf, buf_len, " LLC-ACCESS");
buf += ret;
blen -= ret;
}
if (payload & 0x200) {
ret = snprintf(buf, buf_len, " LLC-REFILL");
buf += ret;
blen -= ret;
}
if (payload & 0x400) {
ret = snprintf(buf, buf_len, " REMOTE-ACCESS");
buf += ret;
blen -= ret;
}
}
if (ret < 0)
return ret;
blen -= ret;
return buf_len - blen;
}
case ARM_SPE_OP_TYPE:
switch (idx) {
case 0: return snprintf(buf, buf_len, "%s", payload & 0x1 ?
"COND-SELECT" : "INSN-OTHER");
case 1: {
size_t blen = buf_len;
if (payload & 0x1)
ret = snprintf(buf, buf_len, "ST");
else
ret = snprintf(buf, buf_len, "LD");
buf += ret;
blen -= ret;
if (payload & 0x2) {
if (payload & 0x4) {
ret = snprintf(buf, buf_len, " AT");
buf += ret;
blen -= ret;
}
if (payload & 0x8) {
ret = snprintf(buf, buf_len, " EXCL");
buf += ret;
blen -= ret;
}
if (payload & 0x10) {
ret = snprintf(buf, buf_len, " AR");
buf += ret;
blen -= ret;
}
} else if (payload & 0x4) {
ret = snprintf(buf, buf_len, " SIMD-FP");
buf += ret;
blen -= ret;
}
if (ret < 0)
return ret;
blen -= ret;
return buf_len - blen;
}
case 2: {
size_t blen = buf_len;
ret = snprintf(buf, buf_len, "B");
buf += ret;
blen -= ret;
if (payload & 0x1) {
ret = snprintf(buf, buf_len, " COND");
buf += ret;
blen -= ret;
}
if (payload & 0x2) {
ret = snprintf(buf, buf_len, " IND");
buf += ret;
blen -= ret;
}
if (ret < 0)
return ret;
blen -= ret;
return buf_len - blen;
}
default: return 0;
}
case ARM_SPE_DATA_SOURCE:
case ARM_SPE_TIMESTAMP:
return snprintf(buf, buf_len, "%s %lld", name, payload);
case ARM_SPE_ADDRESS:
switch (idx) {
case 0:
case 1: ns = !!(packet->payload & NS_FLAG);
el = (packet->payload & EL_FLAG) >> 61;
payload &= ~(0xffULL << 56);
return snprintf(buf, buf_len, "%s 0x%llx el%d ns=%d",
(idx == 1) ? "TGT" : "PC", payload, el, ns);
case 2: return snprintf(buf, buf_len, "VA 0x%llx", payload);
case 3: ns = !!(packet->payload & NS_FLAG);
payload &= ~(0xffULL << 56);
return snprintf(buf, buf_len, "PA 0x%llx ns=%d",
payload, ns);
default: return 0;
}
case ARM_SPE_CONTEXT:
return snprintf(buf, buf_len, "%s 0x%lx el%d", name,
(unsigned long)payload, idx + 1);
case ARM_SPE_COUNTER: {
size_t blen = buf_len;
ret = snprintf(buf, buf_len, "%s %d ", name,
(unsigned short)payload);
buf += ret;
blen -= ret;
switch (idx) {
case 0: ret = snprintf(buf, buf_len, "TOT"); break;
case 1: ret = snprintf(buf, buf_len, "ISSUE"); break;
case 2: ret = snprintf(buf, buf_len, "XLAT"); break;
default: ret = 0;
}
if (ret < 0)
return ret;
blen -= ret;
return buf_len - blen;
}
default:
break;
}
return snprintf(buf, buf_len, "%s 0x%llx (%d)",
name, payload, packet->index);
}
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