From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756221AbbE2Ngo (ORCPT ); Fri, 29 May 2015 09:36:44 -0400 Received: from mga03.intel.com ([134.134.136.65]:46121 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755020AbbE2NgO (ORCPT ); Fri, 29 May 2015 09:36:14 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,517,1427785200"; d="scan'208";a="717534369" From: Adrian Hunter To: Arnaldo Carvalho de Melo Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Jiri Olsa Subject: [PATCH V6 04/17] perf tools: Add Intel PT packet decoder Date: Fri, 29 May 2015 16:33:32 +0300 Message-Id: <1432906425-9911-5-git-send-email-adrian.hunter@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1432906425-9911-1-git-send-email-adrian.hunter@intel.com> References: <1432906425-9911-1-git-send-email-adrian.hunter@intel.com> Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support for decoding Intel Processor Trace packets. This essentially provides intel_pt_get_packet() which takes a buffer of binary data and returns the decoded packet. Signed-off-by: Adrian Hunter --- tools/perf/util/Build | 1 + tools/perf/util/intel-pt-decoder/Build | 1 + .../util/intel-pt-decoder/intel-pt-pkt-decoder.c | 400 +++++++++++++++++++++ .../util/intel-pt-decoder/intel-pt-pkt-decoder.h | 64 ++++ 4 files changed, 466 insertions(+) create mode 100644 tools/perf/util/intel-pt-decoder/Build create mode 100644 tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c create mode 100644 tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.h diff --git a/tools/perf/util/Build b/tools/perf/util/Build index e4b676d..86c81f6 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -75,6 +75,7 @@ libperf-$(CONFIG_X86) += tsc.o libperf-y += cloexec.o libperf-y += thread-stack.o libperf-$(CONFIG_AUXTRACE) += auxtrace.o +libperf-$(CONFIG_AUXTRACE) += intel-pt-decoder/ libperf-y += parse-branch-options.o libperf-$(CONFIG_LIBELF) += symbol-elf.o diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build new file mode 100644 index 0000000..9d67381 --- /dev/null +++ b/tools/perf/util/intel-pt-decoder/Build @@ -0,0 +1 @@ +libperf-$(CONFIG_AUXTRACE) += intel-pt-pkt-decoder.o diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c new file mode 100644 index 0000000..988c82c --- /dev/null +++ b/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c @@ -0,0 +1,400 @@ +/* + * intel_pt_pkt_decoder.c: Intel Processor Trace support + * Copyright (c) 2013-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + */ + +#include +#include +#include +#include + +#include "intel-pt-pkt-decoder.h" + +#define BIT(n) (1 << (n)) + +#define BIT63 ((uint64_t)1 << 63) + +#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 packet_name[] = { + [INTEL_PT_BAD] = "Bad Packet!", + [INTEL_PT_PAD] = "PAD", + [INTEL_PT_TNT] = "TNT", + [INTEL_PT_TIP_PGD] = "TIP.PGD", + [INTEL_PT_TIP_PGE] = "TIP.PGE", + [INTEL_PT_TSC] = "TSC", + [INTEL_PT_MODE_EXEC] = "MODE.Exec", + [INTEL_PT_MODE_TSX] = "MODE.TSX", + [INTEL_PT_TIP] = "TIP", + [INTEL_PT_FUP] = "FUP", + [INTEL_PT_PSB] = "PSB", + [INTEL_PT_PSBEND] = "PSBEND", + [INTEL_PT_CBR] = "CBR", + [INTEL_PT_PIP] = "PIP", + [INTEL_PT_OVF] = "OVF", +}; + +const char *intel_pt_pkt_name(enum intel_pt_pkt_type type) +{ + return packet_name[type]; +} + +static int intel_pt_get_long_tnt(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + uint64_t payload; + int count; + + if (len < 8) + return INTEL_PT_NEED_MORE_BYTES; + + payload = le64_to_cpu(*(uint64_t *)buf); + + for (count = 47; count; count--) { + if (payload & BIT63) + break; + payload <<= 1; + } + + packet->type = INTEL_PT_TNT; + packet->count = count; + packet->payload = payload << 1; + return 8; +} + +static int intel_pt_get_pip(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + uint64_t payload = 0; + + if (len < 8) + return INTEL_PT_NEED_MORE_BYTES; + + packet->type = INTEL_PT_PIP; + memcpy_le64(&payload, buf + 2, 6); + packet->payload = payload >> 1; + + return 8; +} + +static int intel_pt_get_cbr(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + if (len < 4) + return INTEL_PT_NEED_MORE_BYTES; + packet->type = INTEL_PT_CBR; + packet->payload = buf[2]; + return 4; +} + +static int intel_pt_get_ovf(struct intel_pt_pkt *packet) +{ + packet->type = INTEL_PT_OVF; + return 2; +} + +static int intel_pt_get_psb(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + int i; + + if (len < 16) + return INTEL_PT_NEED_MORE_BYTES; + + for (i = 2; i < 16; i += 2) { + if (buf[i] != 2 || buf[i + 1] != 0x82) + return INTEL_PT_BAD_PACKET; + } + + packet->type = INTEL_PT_PSB; + return 16; +} + +static int intel_pt_get_psbend(struct intel_pt_pkt *packet) +{ + packet->type = INTEL_PT_PSBEND; + return 2; +} + +static int intel_pt_get_pad(struct intel_pt_pkt *packet) +{ + packet->type = INTEL_PT_PAD; + return 1; +} + +static int intel_pt_get_ext(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + if (len < 2) + return INTEL_PT_NEED_MORE_BYTES; + + switch (buf[1]) { + case 0xa3: /* Long TNT */ + return intel_pt_get_long_tnt(buf, len, packet); + case 0x43: /* PIP */ + return intel_pt_get_pip(buf, len, packet); + case 0x03: /* CBR */ + return intel_pt_get_cbr(buf, len, packet); + case 0xf3: /* OVF */ + return intel_pt_get_ovf(packet); + case 0x82: /* PSB */ + return intel_pt_get_psb(buf, len, packet); + case 0x23: /* PSBEND */ + return intel_pt_get_psbend(packet); + default: + return INTEL_PT_BAD_PACKET; + } +} + +static int intel_pt_get_short_tnt(unsigned int byte, + struct intel_pt_pkt *packet) +{ + int count; + + for (count = 6; count; count--) { + if (byte & BIT(7)) + break; + byte <<= 1; + } + + packet->type = INTEL_PT_TNT; + packet->count = count; + packet->payload = (uint64_t)byte << 57; + + return 1; +} + +static int intel_pt_get_ip(enum intel_pt_pkt_type type, unsigned int byte, + const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + switch (byte >> 5) { + case 0: + packet->count = 0; + break; + case 1: + if (len < 3) + return INTEL_PT_NEED_MORE_BYTES; + packet->count = 2; + packet->payload = le16_to_cpu(*(uint16_t *)(buf + 1)); + break; + case 2: + if (len < 5) + return INTEL_PT_NEED_MORE_BYTES; + packet->count = 4; + packet->payload = le32_to_cpu(*(uint32_t *)(buf + 1)); + break; + case 3: + case 6: + if (len < 7) + return INTEL_PT_NEED_MORE_BYTES; + packet->count = 6; + memcpy_le64(&packet->payload, buf + 1, 6); + break; + default: + return INTEL_PT_BAD_PACKET; + } + + packet->type = type; + + return packet->count + 1; +} + +static int intel_pt_get_mode(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + if (len < 2) + return INTEL_PT_NEED_MORE_BYTES; + + switch (buf[1] >> 5) { + case 0: + packet->type = INTEL_PT_MODE_EXEC; + switch (buf[1] & 3) { + case 0: + packet->payload = 16; + break; + case 1: + packet->payload = 64; + break; + case 2: + packet->payload = 32; + break; + default: + return INTEL_PT_BAD_PACKET; + } + break; + case 1: + packet->type = INTEL_PT_MODE_TSX; + if ((buf[1] & 3) == 3) + return INTEL_PT_BAD_PACKET; + packet->payload = buf[1] & 3; + break; + default: + return INTEL_PT_BAD_PACKET; + } + + return 2; +} + +static int intel_pt_get_tsc(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + if (len < 8) + return INTEL_PT_NEED_MORE_BYTES; + packet->type = INTEL_PT_TSC; + memcpy_le64(&packet->payload, buf + 1, 7); + return 8; +} + +static int intel_pt_do_get_packet(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + unsigned int byte; + + memset(packet, 0, sizeof(struct intel_pt_pkt)); + + if (!len) + return INTEL_PT_NEED_MORE_BYTES; + + byte = buf[0]; + if (!(byte & BIT(0))) { + if (byte == 0) + return intel_pt_get_pad(packet); + if (byte == 2) + return intel_pt_get_ext(buf, len, packet); + return intel_pt_get_short_tnt(byte, packet); + } + + switch (byte & 0x1f) { + case 0x0D: + return intel_pt_get_ip(INTEL_PT_TIP, byte, buf, len, packet); + case 0x11: + return intel_pt_get_ip(INTEL_PT_TIP_PGE, byte, buf, len, + packet); + case 0x01: + return intel_pt_get_ip(INTEL_PT_TIP_PGD, byte, buf, len, + packet); + case 0x1D: + return intel_pt_get_ip(INTEL_PT_FUP, byte, buf, len, packet); + case 0x19: + switch (byte) { + case 0x99: + return intel_pt_get_mode(buf, len, packet); + case 0x19: + return intel_pt_get_tsc(buf, len, packet); + default: + return INTEL_PT_BAD_PACKET; + } + default: + return INTEL_PT_BAD_PACKET; + } +} + +int intel_pt_get_packet(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet) +{ + int ret; + + ret = intel_pt_do_get_packet(buf, len, packet); + if (ret > 0) { + while (ret < 8 && len > (size_t)ret && !buf[ret]) + ret += 1; + } + return ret; +} + +int intel_pt_pkt_desc(const struct intel_pt_pkt *packet, char *buf, + size_t buf_len) +{ + int ret, i; + unsigned long long payload = packet->payload; + const char *name = intel_pt_pkt_name(packet->type); + + switch (packet->type) { + case INTEL_PT_BAD: + case INTEL_PT_PAD: + case INTEL_PT_PSB: + case INTEL_PT_PSBEND: + case INTEL_PT_OVF: + return snprintf(buf, buf_len, "%s", name); + case INTEL_PT_TNT: { + size_t blen = buf_len; + + ret = snprintf(buf, blen, "%s ", name); + if (ret < 0) + return ret; + buf += ret; + blen -= ret; + for (i = 0; i < packet->count; i++) { + if (payload & BIT63) + ret = snprintf(buf, blen, "T"); + else + ret = snprintf(buf, blen, "N"); + if (ret < 0) + return ret; + buf += ret; + blen -= ret; + payload <<= 1; + } + ret = snprintf(buf, blen, " (%d)", packet->count); + if (ret < 0) + return ret; + blen -= ret; + return buf_len - blen; + } + case INTEL_PT_TIP_PGD: + case INTEL_PT_TIP_PGE: + case INTEL_PT_TIP: + case INTEL_PT_FUP: + if (!(packet->count)) + return snprintf(buf, buf_len, "%s no ip", name); + case INTEL_PT_CBR: + return snprintf(buf, buf_len, "%s 0x%llx", name, payload); + case INTEL_PT_TSC: + if (packet->count) + return snprintf(buf, buf_len, + "%s 0x%llx CTC 0x%x FC 0x%x", + name, payload, packet->count & 0xffff, + (packet->count >> 16) & 0x1ff); + else + return snprintf(buf, buf_len, "%s 0x%llx", + name, payload); + case INTEL_PT_MODE_EXEC: + return snprintf(buf, buf_len, "%s %lld", name, payload); + case INTEL_PT_MODE_TSX: + return snprintf(buf, buf_len, "%s TXAbort:%u InTX:%u", + name, (unsigned)(payload >> 1) & 1, + (unsigned)payload & 1); + case INTEL_PT_PIP: + ret = snprintf(buf, buf_len, "%s 0x%llx", + name, payload); + return ret; + default: + break; + } + return snprintf(buf, buf_len, "%s 0x%llx (%d)", + name, payload, packet->count); +} diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.h b/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.h new file mode 100644 index 0000000..53404fa --- /dev/null +++ b/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.h @@ -0,0 +1,64 @@ +/* + * intel_pt_pkt_decoder.h: Intel Processor Trace support + * Copyright (c) 2013-2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + */ + +#ifndef INCLUDE__INTEL_PT_PKT_DECODER_H__ +#define INCLUDE__INTEL_PT_PKT_DECODER_H__ + +#include +#include + +#define INTEL_PT_PKT_DESC_MAX 256 + +#define INTEL_PT_NEED_MORE_BYTES -1 +#define INTEL_PT_BAD_PACKET -2 + +#define INTEL_PT_PSB_STR "\002\202\002\202\002\202\002\202" \ + "\002\202\002\202\002\202\002\202" +#define INTEL_PT_PSB_LEN 16 + +#define INTEL_PT_PKT_MAX_SZ 16 + +enum intel_pt_pkt_type { + INTEL_PT_BAD, + INTEL_PT_PAD, + INTEL_PT_TNT, + INTEL_PT_TIP_PGD, + INTEL_PT_TIP_PGE, + INTEL_PT_TSC, + INTEL_PT_MODE_EXEC, + INTEL_PT_MODE_TSX, + INTEL_PT_TIP, + INTEL_PT_FUP, + INTEL_PT_PSB, + INTEL_PT_PSBEND, + INTEL_PT_CBR, + INTEL_PT_PIP, + INTEL_PT_OVF, +}; + +struct intel_pt_pkt { + enum intel_pt_pkt_type type; + int count; + uint64_t payload; +}; + +const char *intel_pt_pkt_name(enum intel_pt_pkt_type); + +int intel_pt_get_packet(const unsigned char *buf, size_t len, + struct intel_pt_pkt *packet); + +int intel_pt_pkt_desc(const struct intel_pt_pkt *packet, char *buf, size_t len); + +#endif -- 1.9.1