536 lines
14 KiB
C
536 lines
14 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 <linux/bitops.h>
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#include <stdarg.h>
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#include "arm-spe-pkt-decoder.h"
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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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/*
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* Extracts the field "sz" from header bits and converts to bytes:
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* 00 : byte (1)
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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 unsigned int arm_spe_payload_len(unsigned char hdr)
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{
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return 1U << ((hdr & GENMASK_ULL(5, 4)) >> 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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unsigned char ext_hdr,
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struct arm_spe_pkt *packet)
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{
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size_t payload_len = arm_spe_payload_len(buf[ext_hdr]);
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if (len < 1 + ext_hdr + payload_len)
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return ARM_SPE_NEED_MORE_BYTES;
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buf += 1 + ext_hdr;
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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 + ext_hdr + 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, 0, 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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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 if
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* index > 1.
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*/
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packet->index = arm_spe_payload_len(buf[0]);
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return arm_spe_get_payload(buf, len, 0, packet);
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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, 0, 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 = SPE_CTX_PKT_HDR_INDEX(buf[0]);
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return arm_spe_get_payload(buf, len, 0, 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 = SPE_OP_PKT_HDR_CLASS(buf[0]);
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return arm_spe_get_payload(buf, len, 0, 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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packet->type = ARM_SPE_COUNTER;
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if (ext_hdr)
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packet->index = SPE_HDR_EXTENDED_INDEX(buf[0], buf[1]);
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else
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packet->index = SPE_HDR_SHORT_INDEX(buf[0]);
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return arm_spe_get_payload(buf, len, ext_hdr, packet);
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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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packet->type = ARM_SPE_ADDRESS;
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if (ext_hdr)
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packet->index = SPE_HDR_EXTENDED_INDEX(buf[0], buf[1]);
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else
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packet->index = SPE_HDR_SHORT_INDEX(buf[0]);
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return arm_spe_get_payload(buf, len, ext_hdr, packet);
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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 hdr;
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unsigned char ext_hdr = 0;
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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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hdr = buf[0];
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if (hdr == SPE_HEADER0_PAD)
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return arm_spe_get_pad(packet);
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if (hdr == SPE_HEADER0_END) /* no timestamp at end of record */
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return arm_spe_get_end(packet);
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if (hdr == SPE_HEADER0_TIMESTAMP)
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return arm_spe_get_timestamp(buf, len, packet);
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if ((hdr & SPE_HEADER0_MASK1) == SPE_HEADER0_EVENTS)
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return arm_spe_get_events(buf, len, packet);
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if ((hdr & SPE_HEADER0_MASK1) == SPE_HEADER0_SOURCE)
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return arm_spe_get_data_source(buf, len, packet);
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if ((hdr & SPE_HEADER0_MASK2) == SPE_HEADER0_CONTEXT)
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return arm_spe_get_context(buf, len, packet);
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if ((hdr & SPE_HEADER0_MASK2) == SPE_HEADER0_OP_TYPE)
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return arm_spe_get_op_type(buf, len, packet);
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if ((hdr & SPE_HEADER0_MASK2) == SPE_HEADER0_EXTENDED) {
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/* 16-bit extended format header */
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if (len == 1)
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return ARM_SPE_BAD_PACKET;
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ext_hdr = 1;
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hdr = buf[1];
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if (hdr == SPE_HEADER1_ALIGNMENT)
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return arm_spe_get_alignment(buf, len, packet);
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}
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/*
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* The short format header's byte 0 or the extended format header's
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* byte 1 has been assigned to 'hdr', which uses the same encoding for
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* address packet and counter packet, so don't need to distinguish if
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* it's short format or extended format and handle in once.
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*/
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if ((hdr & SPE_HEADER0_MASK3) == SPE_HEADER0_ADDRESS)
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return arm_spe_get_addr(buf, len, ext_hdr, packet);
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if ((hdr & SPE_HEADER0_MASK3) == SPE_HEADER0_COUNTER)
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return arm_spe_get_counter(buf, len, ext_hdr, packet);
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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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static int arm_spe_pkt_out_string(int *err, char **buf_p, size_t *blen,
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const char *fmt, ...)
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{
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va_list ap;
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int ret;
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/* Bail out if any error occurred */
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if (err && *err)
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return *err;
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va_start(ap, fmt);
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ret = vsnprintf(*buf_p, *blen, fmt, ap);
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va_end(ap);
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if (ret < 0) {
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if (err && !*err)
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*err = ret;
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/*
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* A return value of *blen or more means that the output was
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* truncated and the buffer is overrun.
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*/
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} else if ((size_t)ret >= *blen) {
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(*buf_p)[*blen - 1] = '\0';
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/*
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* Set *err to 'ret' to avoid overflow if tries to
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* fill this buffer sequentially.
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*/
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if (err && !*err)
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*err = ret;
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} else {
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*buf_p += ret;
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*blen -= ret;
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}
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return ret;
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}
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static int arm_spe_pkt_desc_event(const struct arm_spe_pkt *packet,
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char *buf, size_t buf_len)
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{
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u64 payload = packet->payload;
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int err = 0;
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arm_spe_pkt_out_string(&err, &buf, &buf_len, "EV");
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if (payload & BIT(EV_EXCEPTION_GEN))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " EXCEPTION-GEN");
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if (payload & BIT(EV_RETIRED))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " RETIRED");
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if (payload & BIT(EV_L1D_ACCESS))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " L1D-ACCESS");
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if (payload & BIT(EV_L1D_REFILL))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " L1D-REFILL");
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if (payload & BIT(EV_TLB_ACCESS))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " TLB-ACCESS");
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if (payload & BIT(EV_TLB_WALK))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " TLB-REFILL");
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if (payload & BIT(EV_NOT_TAKEN))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " NOT-TAKEN");
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if (payload & BIT(EV_MISPRED))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " MISPRED");
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if (payload & BIT(EV_LLC_ACCESS))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " LLC-ACCESS");
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if (payload & BIT(EV_LLC_MISS))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " LLC-REFILL");
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if (payload & BIT(EV_REMOTE_ACCESS))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " REMOTE-ACCESS");
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if (payload & BIT(EV_ALIGNMENT))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " ALIGNMENT");
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if (payload & BIT(EV_PARTIAL_PREDICATE))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " SVE-PARTIAL-PRED");
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if (payload & BIT(EV_EMPTY_PREDICATE))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " SVE-EMPTY-PRED");
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return err;
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}
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static int arm_spe_pkt_desc_op_type(const struct arm_spe_pkt *packet,
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char *buf, size_t buf_len)
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{
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u64 payload = packet->payload;
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int err = 0;
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switch (packet->index) {
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case SPE_OP_PKT_HDR_CLASS_OTHER:
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if (SPE_OP_PKT_IS_OTHER_SVE_OP(payload)) {
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arm_spe_pkt_out_string(&err, &buf, &buf_len, "SVE-OTHER");
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/* SVE effective vector length */
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " EVLEN %d",
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SPE_OP_PKG_SVE_EVL(payload));
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if (payload & SPE_OP_PKT_SVE_FP)
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " FP");
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if (payload & SPE_OP_PKT_SVE_PRED)
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " PRED");
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} else {
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arm_spe_pkt_out_string(&err, &buf, &buf_len, "OTHER");
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " %s",
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payload & SPE_OP_PKT_COND ?
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"COND-SELECT" : "INSN-OTHER");
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}
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break;
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case SPE_OP_PKT_HDR_CLASS_LD_ST_ATOMIC:
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arm_spe_pkt_out_string(&err, &buf, &buf_len,
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payload & 0x1 ? "ST" : "LD");
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if (SPE_OP_PKT_IS_LDST_ATOMIC(payload)) {
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if (payload & SPE_OP_PKT_AT)
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " AT");
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if (payload & SPE_OP_PKT_EXCL)
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " EXCL");
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if (payload & SPE_OP_PKT_AR)
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " AR");
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}
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switch (SPE_OP_PKT_LDST_SUBCLASS_GET(payload)) {
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case SPE_OP_PKT_LDST_SUBCLASS_SIMD_FP:
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " SIMD-FP");
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break;
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case SPE_OP_PKT_LDST_SUBCLASS_GP_REG:
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " GP-REG");
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break;
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case SPE_OP_PKT_LDST_SUBCLASS_UNSPEC_REG:
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " UNSPEC-REG");
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break;
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case SPE_OP_PKT_LDST_SUBCLASS_NV_SYSREG:
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " NV-SYSREG");
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break;
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default:
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break;
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}
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if (SPE_OP_PKT_IS_LDST_SVE(payload)) {
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/* SVE effective vector length */
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " EVLEN %d",
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SPE_OP_PKG_SVE_EVL(payload));
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if (payload & SPE_OP_PKT_SVE_PRED)
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " PRED");
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if (payload & SPE_OP_PKT_SVE_SG)
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " SG");
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}
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break;
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case SPE_OP_PKT_HDR_CLASS_BR_ERET:
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arm_spe_pkt_out_string(&err, &buf, &buf_len, "B");
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if (payload & SPE_OP_PKT_COND)
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " COND");
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if (SPE_OP_PKT_IS_INDIRECT_BRANCH(payload))
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arm_spe_pkt_out_string(&err, &buf, &buf_len, " IND");
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break;
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default:
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/* Unknown index */
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err = -1;
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break;
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}
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return err;
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}
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static int arm_spe_pkt_desc_addr(const struct arm_spe_pkt *packet,
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char *buf, size_t buf_len)
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{
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int ns, el, idx = packet->index;
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int ch, pat;
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u64 payload = packet->payload;
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int err = 0;
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switch (idx) {
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case SPE_ADDR_PKT_HDR_INDEX_INS:
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case SPE_ADDR_PKT_HDR_INDEX_BRANCH:
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ns = !!SPE_ADDR_PKT_GET_NS(payload);
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el = SPE_ADDR_PKT_GET_EL(payload);
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payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload);
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arm_spe_pkt_out_string(&err, &buf, &buf_len,
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"%s 0x%llx el%d ns=%d",
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(idx == 1) ? "TGT" : "PC", payload, el, ns);
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break;
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case SPE_ADDR_PKT_HDR_INDEX_DATA_VIRT:
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arm_spe_pkt_out_string(&err, &buf, &buf_len,
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"VA 0x%llx", payload);
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break;
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case SPE_ADDR_PKT_HDR_INDEX_DATA_PHYS:
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ns = !!SPE_ADDR_PKT_GET_NS(payload);
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ch = !!SPE_ADDR_PKT_GET_CH(payload);
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pat = SPE_ADDR_PKT_GET_PAT(payload);
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payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload);
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arm_spe_pkt_out_string(&err, &buf, &buf_len,
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"PA 0x%llx ns=%d ch=%d pat=%x",
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payload, ns, ch, pat);
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break;
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default:
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/* Unknown index */
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err = -1;
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break;
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}
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return err;
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}
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static int arm_spe_pkt_desc_counter(const struct arm_spe_pkt *packet,
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char *buf, size_t buf_len)
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{
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u64 payload = packet->payload;
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const char *name = arm_spe_pkt_name(packet->type);
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int err = 0;
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|
|
|
arm_spe_pkt_out_string(&err, &buf, &buf_len, "%s %d ", name,
|
|
(unsigned short)payload);
|
|
|
|
switch (packet->index) {
|
|
case SPE_CNT_PKT_HDR_INDEX_TOTAL_LAT:
|
|
arm_spe_pkt_out_string(&err, &buf, &buf_len, "TOT");
|
|
break;
|
|
case SPE_CNT_PKT_HDR_INDEX_ISSUE_LAT:
|
|
arm_spe_pkt_out_string(&err, &buf, &buf_len, "ISSUE");
|
|
break;
|
|
case SPE_CNT_PKT_HDR_INDEX_TRANS_LAT:
|
|
arm_spe_pkt_out_string(&err, &buf, &buf_len, "XLAT");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int arm_spe_pkt_desc(const struct arm_spe_pkt *packet, char *buf,
|
|
size_t buf_len)
|
|
{
|
|
int idx = packet->index;
|
|
unsigned long long payload = packet->payload;
|
|
const char *name = arm_spe_pkt_name(packet->type);
|
|
char *buf_orig = buf;
|
|
size_t blen = buf_len;
|
|
int err = 0;
|
|
|
|
switch (packet->type) {
|
|
case ARM_SPE_BAD:
|
|
case ARM_SPE_PAD:
|
|
case ARM_SPE_END:
|
|
arm_spe_pkt_out_string(&err, &buf, &blen, "%s", name);
|
|
break;
|
|
case ARM_SPE_EVENTS:
|
|
err = arm_spe_pkt_desc_event(packet, buf, buf_len);
|
|
break;
|
|
case ARM_SPE_OP_TYPE:
|
|
err = arm_spe_pkt_desc_op_type(packet, buf, buf_len);
|
|
break;
|
|
case ARM_SPE_DATA_SOURCE:
|
|
case ARM_SPE_TIMESTAMP:
|
|
arm_spe_pkt_out_string(&err, &buf, &blen, "%s %lld", name, payload);
|
|
break;
|
|
case ARM_SPE_ADDRESS:
|
|
err = arm_spe_pkt_desc_addr(packet, buf, buf_len);
|
|
break;
|
|
case ARM_SPE_CONTEXT:
|
|
arm_spe_pkt_out_string(&err, &buf, &blen, "%s 0x%lx el%d",
|
|
name, (unsigned long)payload, idx + 1);
|
|
break;
|
|
case ARM_SPE_COUNTER:
|
|
err = arm_spe_pkt_desc_counter(packet, buf, buf_len);
|
|
break;
|
|
default:
|
|
/* Unknown packet type */
|
|
err = -1;
|
|
break;
|
|
}
|
|
|
|
/* Output raw data if detect any error */
|
|
if (err) {
|
|
err = 0;
|
|
arm_spe_pkt_out_string(&err, &buf_orig, &buf_len, "%s 0x%llx (%d)",
|
|
name, payload, packet->index);
|
|
}
|
|
|
|
return err;
|
|
}
|