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