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Subject[tip:perf/core] perf tools: Add decoder mechanic to support dumping trace data
Commit-ID:  68ffe39028982d08bf382700642ed46cc0539e1b
Gitweb: https://git.kernel.org/tip/68ffe39028982d08bf382700642ed46cc0539e1b
Author: Mathieu Poirier <mathieu.poirier@linaro.org>
AuthorDate: Wed, 17 Jan 2018 10:52:13 -0700
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 25 Jan 2018 06:37:25 -0300

perf tools: Add decoder mechanic to support dumping trace data

This patch adds the required interface to the openCSD library to support
dumping CoreSight trace packet using the "report --dump" command. The
information conveyed is related to the type of packets gathered by a
trace session rather than full decoding.

Co-authored-by: Tor Jeremiassen <tor@ti.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: Mike Leach <mike.leach@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1516211539-5166-5-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/Build | 1 +
tools/perf/util/cs-etm-decoder/Build | 1 +
tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 334 ++++++++++++++++++++++++
tools/perf/util/cs-etm-decoder/cs-etm-decoder.h | 96 +++++++
tools/perf/util/cs-etm.c | 108 +++++++-
5 files changed, 536 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index c054ff8..ea0a452 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -91,6 +91,7 @@ libperf-$(CONFIG_AUXTRACE) += arm-spe-pkt-decoder.o

ifdef CONFIG_LIBOPENCSD
libperf-$(CONFIG_AUXTRACE) += cs-etm.o
+libperf-$(CONFIG_AUXTRACE) += cs-etm-decoder/
endif

libperf-y += parse-branch-options.o
diff --git a/tools/perf/util/cs-etm-decoder/Build b/tools/perf/util/cs-etm-decoder/Build
new file mode 100644
index 0000000..bc22c39
--- /dev/null
+++ b/tools/perf/util/cs-etm-decoder/Build
@@ -0,0 +1 @@
+libperf-$(CONFIG_AUXTRACE) += cs-etm-decoder.o
diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
new file mode 100644
index 0000000..6a4c86b
--- /dev/null
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -0,0 +1,334 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright(C) 2015-2018 Linaro Limited.
+ *
+ * Author: Tor Jeremiassen <tor@ti.com>
+ * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
+ */
+
+#include <linux/err.h>
+#include <linux/list.h>
+#include <stdlib.h>
+#include <opencsd/c_api/opencsd_c_api.h>
+#include <opencsd/etmv4/trc_pkt_types_etmv4.h>
+#include <opencsd/ocsd_if_types.h>
+
+#include "cs-etm.h"
+#include "cs-etm-decoder.h"
+#include "intlist.h"
+#include "util.h"
+
+#define MAX_BUFFER 1024
+
+/* use raw logging */
+#ifdef CS_DEBUG_RAW
+#define CS_LOG_RAW_FRAMES
+#ifdef CS_RAW_PACKED
+#define CS_RAW_DEBUG_FLAGS (OCSD_DFRMTR_UNPACKED_RAW_OUT | \
+ OCSD_DFRMTR_PACKED_RAW_OUT)
+#else
+#define CS_RAW_DEBUG_FLAGS (OCSD_DFRMTR_UNPACKED_RAW_OUT)
+#endif
+#endif
+
+struct cs_etm_decoder {
+ void *data;
+ void (*packet_printer)(const char *msg);
+ bool trace_on;
+ dcd_tree_handle_t dcd_tree;
+ cs_etm_mem_cb_type mem_access;
+ ocsd_datapath_resp_t prev_return;
+ u32 packet_count;
+ u32 head;
+ u32 tail;
+ struct cs_etm_packet packet_buffer[MAX_BUFFER];
+};
+
+static void cs_etm_decoder__gen_etmv4_config(struct cs_etm_trace_params *params,
+ ocsd_etmv4_cfg *config)
+{
+ config->reg_configr = params->etmv4.reg_configr;
+ config->reg_traceidr = params->etmv4.reg_traceidr;
+ config->reg_idr0 = params->etmv4.reg_idr0;
+ config->reg_idr1 = params->etmv4.reg_idr1;
+ config->reg_idr2 = params->etmv4.reg_idr2;
+ config->reg_idr8 = params->etmv4.reg_idr8;
+ config->reg_idr9 = 0;
+ config->reg_idr10 = 0;
+ config->reg_idr11 = 0;
+ config->reg_idr12 = 0;
+ config->reg_idr13 = 0;
+ config->arch_ver = ARCH_V8;
+ config->core_prof = profile_CortexA;
+}
+
+static void cs_etm_decoder__print_str_cb(const void *p_context,
+ const char *msg,
+ const int str_len)
+{
+ if (p_context && str_len)
+ ((struct cs_etm_decoder *)p_context)->packet_printer(msg);
+}
+
+static int
+cs_etm_decoder__init_def_logger_printing(struct cs_etm_decoder_params *d_params,
+ struct cs_etm_decoder *decoder)
+{
+ int ret = 0;
+
+ if (d_params->packet_printer == NULL)
+ return -1;
+
+ decoder->packet_printer = d_params->packet_printer;
+
+ /*
+ * Set up a library default logger to process any printers
+ * (packet/raw frame) we add later.
+ */
+ ret = ocsd_def_errlog_init(OCSD_ERR_SEV_ERROR, 1);
+ if (ret != 0)
+ return -1;
+
+ /* no stdout / err / file output */
+ ret = ocsd_def_errlog_config_output(C_API_MSGLOGOUT_FLG_NONE, NULL);
+ if (ret != 0)
+ return -1;
+
+ /*
+ * Set the string CB for the default logger, passes strings to
+ * perf print logger.
+ */
+ ret = ocsd_def_errlog_set_strprint_cb(decoder->dcd_tree,
+ (void *)decoder,
+ cs_etm_decoder__print_str_cb);
+ if (ret != 0)
+ ret = -1;
+
+ return 0;
+}
+
+#ifdef CS_LOG_RAW_FRAMES
+static void
+cs_etm_decoder__init_raw_frame_logging(struct cs_etm_decoder_params *d_params,
+ struct cs_etm_decoder *decoder)
+{
+ /* Only log these during a --dump operation */
+ if (d_params->operation == CS_ETM_OPERATION_PRINT) {
+ /* set up a library default logger to process the
+ * raw frame printer we add later
+ */
+ ocsd_def_errlog_init(OCSD_ERR_SEV_ERROR, 1);
+
+ /* no stdout / err / file output */
+ ocsd_def_errlog_config_output(C_API_MSGLOGOUT_FLG_NONE, NULL);
+
+ /* set the string CB for the default logger,
+ * passes strings to perf print logger.
+ */
+ ocsd_def_errlog_set_strprint_cb(decoder->dcd_tree,
+ (void *)decoder,
+ cs_etm_decoder__print_str_cb);
+
+ /* use the built in library printer for the raw frames */
+ ocsd_dt_set_raw_frame_printer(decoder->dcd_tree,
+ CS_RAW_DEBUG_FLAGS);
+ }
+}
+#else
+static void
+cs_etm_decoder__init_raw_frame_logging(
+ struct cs_etm_decoder_params *d_params __maybe_unused,
+ struct cs_etm_decoder *decoder __maybe_unused)
+{
+}
+#endif
+
+static int cs_etm_decoder__create_packet_printer(struct cs_etm_decoder *decoder,
+ const char *decoder_name,
+ void *trace_config)
+{
+ u8 csid;
+
+ if (ocsd_dt_create_decoder(decoder->dcd_tree, decoder_name,
+ OCSD_CREATE_FLG_PACKET_PROC,
+ trace_config, &csid))
+ return -1;
+
+ if (ocsd_dt_set_pkt_protocol_printer(decoder->dcd_tree, csid, 0))
+ return -1;
+
+ return 0;
+}
+
+static int
+cs_etm_decoder__create_etm_packet_printer(struct cs_etm_trace_params *t_params,
+ struct cs_etm_decoder *decoder)
+{
+ const char *decoder_name;
+ ocsd_etmv4_cfg trace_config_etmv4;
+ void *trace_config;
+
+ switch (t_params->protocol) {
+ case CS_ETM_PROTO_ETMV4i:
+ cs_etm_decoder__gen_etmv4_config(t_params, &trace_config_etmv4);
+ decoder_name = OCSD_BUILTIN_DCD_ETMV4I;
+ trace_config = &trace_config_etmv4;
+ break;
+ default:
+ return -1;
+ }
+
+ return cs_etm_decoder__create_packet_printer(decoder,
+ decoder_name,
+ trace_config);
+}
+
+static void cs_etm_decoder__clear_buffer(struct cs_etm_decoder *decoder)
+{
+ int i;
+
+ decoder->head = 0;
+ decoder->tail = 0;
+ decoder->packet_count = 0;
+ for (i = 0; i < MAX_BUFFER; i++) {
+ decoder->packet_buffer[i].start_addr = 0xdeadbeefdeadbeefUL;
+ decoder->packet_buffer[i].end_addr = 0xdeadbeefdeadbeefUL;
+ decoder->packet_buffer[i].exc = false;
+ decoder->packet_buffer[i].exc_ret = false;
+ decoder->packet_buffer[i].cpu = INT_MIN;
+ }
+}
+
+static int
+cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params,
+ struct cs_etm_trace_params *t_params,
+ struct cs_etm_decoder *decoder)
+{
+ if (d_params->operation == CS_ETM_OPERATION_PRINT)
+ return cs_etm_decoder__create_etm_packet_printer(t_params,
+ decoder);
+ return -1;
+}
+
+struct cs_etm_decoder *
+cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params,
+ struct cs_etm_trace_params t_params[])
+{
+ struct cs_etm_decoder *decoder;
+ ocsd_dcd_tree_src_t format;
+ u32 flags;
+ int i, ret;
+
+ if ((!t_params) || (!d_params))
+ return NULL;
+
+ decoder = zalloc(sizeof(*decoder));
+
+ if (!decoder)
+ return NULL;
+
+ decoder->data = d_params->data;
+ decoder->prev_return = OCSD_RESP_CONT;
+ cs_etm_decoder__clear_buffer(decoder);
+ format = (d_params->formatted ? OCSD_TRC_SRC_FRAME_FORMATTED :
+ OCSD_TRC_SRC_SINGLE);
+ flags = 0;
+ flags |= (d_params->fsyncs ? OCSD_DFRMTR_HAS_FSYNCS : 0);
+ flags |= (d_params->hsyncs ? OCSD_DFRMTR_HAS_HSYNCS : 0);
+ flags |= (d_params->frame_aligned ? OCSD_DFRMTR_FRAME_MEM_ALIGN : 0);
+
+ /*
+ * Drivers may add barrier frames when used with perf, set up to
+ * handle this. Barriers const of FSYNC packet repeated 4 times.
+ */
+ flags |= OCSD_DFRMTR_RESET_ON_4X_FSYNC;
+
+ /* Create decode tree for the data source */
+ decoder->dcd_tree = ocsd_create_dcd_tree(format, flags);
+
+ if (decoder->dcd_tree == 0)
+ goto err_free_decoder;
+
+ /* init library print logging support */
+ ret = cs_etm_decoder__init_def_logger_printing(d_params, decoder);
+ if (ret != 0)
+ goto err_free_decoder_tree;
+
+ /* init raw frame logging if required */
+ cs_etm_decoder__init_raw_frame_logging(d_params, decoder);
+
+ for (i = 0; i < num_cpu; i++) {
+ ret = cs_etm_decoder__create_etm_decoder(d_params,
+ &t_params[i],
+ decoder);
+ if (ret != 0)
+ goto err_free_decoder_tree;
+ }
+
+ return decoder;
+
+err_free_decoder_tree:
+ ocsd_destroy_dcd_tree(decoder->dcd_tree);
+err_free_decoder:
+ free(decoder);
+ return NULL;
+}
+
+int cs_etm_decoder__process_data_block(struct cs_etm_decoder *decoder,
+ u64 indx, const u8 *buf,
+ size_t len, size_t *consumed)
+{
+ int ret = 0;
+ ocsd_datapath_resp_t cur = OCSD_RESP_CONT;
+ ocsd_datapath_resp_t prev_return = decoder->prev_return;
+ size_t processed = 0;
+ u32 count;
+
+ while (processed < len) {
+ if (OCSD_DATA_RESP_IS_WAIT(prev_return)) {
+ cur = ocsd_dt_process_data(decoder->dcd_tree,
+ OCSD_OP_FLUSH,
+ 0,
+ 0,
+ NULL,
+ NULL);
+ } else if (OCSD_DATA_RESP_IS_CONT(prev_return)) {
+ cur = ocsd_dt_process_data(decoder->dcd_tree,
+ OCSD_OP_DATA,
+ indx + processed,
+ len - processed,
+ &buf[processed],
+ &count);
+ processed += count;
+ } else {
+ ret = -EINVAL;
+ break;
+ }
+
+ /*
+ * Return to the input code if the packet buffer is full.
+ * Flushing will get done once the packet buffer has been
+ * processed.
+ */
+ if (OCSD_DATA_RESP_IS_WAIT(cur))
+ break;
+
+ prev_return = cur;
+ }
+
+ decoder->prev_return = cur;
+ *consumed = processed;
+
+ return ret;
+}
+
+void cs_etm_decoder__free(struct cs_etm_decoder *decoder)
+{
+ if (!decoder)
+ return;
+
+ ocsd_destroy_dcd_tree(decoder->dcd_tree);
+ decoder->dcd_tree = NULL;
+ free(decoder);
+}
diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
new file mode 100644
index 0000000..a1e9b0a
--- /dev/null
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
@@ -0,0 +1,96 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright(C) 2015-2018 Linaro Limited.
+ *
+ * Author: Tor Jeremiassen <tor@ti.com>
+ * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
+ */
+
+#ifndef INCLUDE__CS_ETM_DECODER_H__
+#define INCLUDE__CS_ETM_DECODER_H__
+
+#include <linux/types.h>
+#include <stdio.h>
+
+struct cs_etm_decoder;
+
+struct cs_etm_buffer {
+ const unsigned char *buf;
+ size_t len;
+ u64 offset;
+ u64 ref_timestamp;
+};
+
+enum cs_etm_sample_type {
+ CS_ETM_RANGE = 1 << 0,
+};
+
+struct cs_etm_packet {
+ enum cs_etm_sample_type sample_type;
+ u64 start_addr;
+ u64 end_addr;
+ u8 exc;
+ u8 exc_ret;
+ int cpu;
+};
+
+struct cs_etm_queue;
+
+typedef u32 (*cs_etm_mem_cb_type)(struct cs_etm_queue *, u64,
+ size_t, u8 *);
+
+struct cs_etmv4_trace_params {
+ u32 reg_idr0;
+ u32 reg_idr1;
+ u32 reg_idr2;
+ u32 reg_idr8;
+ u32 reg_configr;
+ u32 reg_traceidr;
+};
+
+struct cs_etm_trace_params {
+ int protocol;
+ union {
+ struct cs_etmv4_trace_params etmv4;
+ };
+};
+
+struct cs_etm_decoder_params {
+ int operation;
+ void (*packet_printer)(const char *msg);
+ cs_etm_mem_cb_type mem_acc_cb;
+ u8 formatted;
+ u8 fsyncs;
+ u8 hsyncs;
+ u8 frame_aligned;
+ void *data;
+};
+
+/*
+ * The following enums are indexed starting with 1 to align with the
+ * open source coresight trace decoder library.
+ */
+enum {
+ CS_ETM_PROTO_ETMV3 = 1,
+ CS_ETM_PROTO_ETMV4i,
+ CS_ETM_PROTO_ETMV4d,
+};
+
+enum {
+ CS_ETM_OPERATION_PRINT = 1,
+ CS_ETM_OPERATION_DECODE,
+};
+
+int cs_etm_decoder__process_data_block(struct cs_etm_decoder *decoder,
+ u64 indx, const u8 *buf,
+ size_t len, size_t *consumed);
+
+struct cs_etm_decoder *
+cs_etm_decoder__new(int num_cpu,
+ struct cs_etm_decoder_params *d_params,
+ struct cs_etm_trace_params t_params[]);
+
+void cs_etm_decoder__free(struct cs_etm_decoder *decoder);
+
+#endif /* INCLUDE__CS_ETM_DECODER_H__ */
diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 18894ee..cad429c 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -18,6 +18,7 @@
#include "auxtrace.h"
#include "color.h"
#include "cs-etm.h"
+#include "cs-etm-decoder/cs-etm-decoder.h"
#include "debug.h"
#include "evlist.h"
#include "intlist.h"
@@ -69,6 +70,78 @@ struct cs_etm_queue {
u64 offset;
};

+static void cs_etm__packet_dump(const char *pkt_string)
+{
+ const char *color = PERF_COLOR_BLUE;
+ int len = strlen(pkt_string);
+
+ if (len && (pkt_string[len-1] == '\n'))
+ color_fprintf(stdout, color, " %s", pkt_string);
+ else
+ color_fprintf(stdout, color, " %s\n", pkt_string);
+
+ fflush(stdout);
+}
+
+static void cs_etm__dump_event(struct cs_etm_auxtrace *etm,
+ struct auxtrace_buffer *buffer)
+{
+ int i, ret;
+ const char *color = PERF_COLOR_BLUE;
+ struct cs_etm_decoder_params d_params;
+ struct cs_etm_trace_params *t_params;
+ struct cs_etm_decoder *decoder;
+ size_t buffer_used = 0;
+
+ fprintf(stdout, "\n");
+ color_fprintf(stdout, color,
+ ". ... CoreSight ETM Trace data: size %zu bytes\n",
+ buffer->size);
+
+ /* Use metadata to fill in trace parameters for trace decoder */
+ t_params = zalloc(sizeof(*t_params) * etm->num_cpu);
+ for (i = 0; i < etm->num_cpu; i++) {
+ t_params[i].protocol = CS_ETM_PROTO_ETMV4i;
+ t_params[i].etmv4.reg_idr0 = etm->metadata[i][CS_ETMV4_TRCIDR0];
+ t_params[i].etmv4.reg_idr1 = etm->metadata[i][CS_ETMV4_TRCIDR1];
+ t_params[i].etmv4.reg_idr2 = etm->metadata[i][CS_ETMV4_TRCIDR2];
+ t_params[i].etmv4.reg_idr8 = etm->metadata[i][CS_ETMV4_TRCIDR8];
+ t_params[i].etmv4.reg_configr =
+ etm->metadata[i][CS_ETMV4_TRCCONFIGR];
+ t_params[i].etmv4.reg_traceidr =
+ etm->metadata[i][CS_ETMV4_TRCTRACEIDR];
+ }
+
+ /* Set decoder parameters to simply print the trace packets */
+ d_params.packet_printer = cs_etm__packet_dump;
+ d_params.operation = CS_ETM_OPERATION_PRINT;
+ d_params.formatted = true;
+ d_params.fsyncs = false;
+ d_params.hsyncs = false;
+ d_params.frame_aligned = true;
+
+ decoder = cs_etm_decoder__new(etm->num_cpu, &d_params, t_params);
+
+ zfree(&t_params);
+
+ if (!decoder)
+ return;
+ do {
+ size_t consumed;
+
+ ret = cs_etm_decoder__process_data_block(
+ decoder, buffer->offset,
+ &((u8 *)buffer->data)[buffer_used],
+ buffer->size - buffer_used, &consumed);
+ if (ret)
+ break;
+
+ buffer_used += consumed;
+ } while (buffer_used < buffer->size);
+
+ cs_etm_decoder__free(decoder);
+}
+
static int cs_etm__flush_events(struct perf_session *session,
struct perf_tool *tool)
{
@@ -137,11 +210,38 @@ static int cs_etm__process_event(struct perf_session *session,

static int cs_etm__process_auxtrace_event(struct perf_session *session,
union perf_event *event,
- struct perf_tool *tool)
+ struct perf_tool *tool __maybe_unused)
{
- (void) session;
- (void) event;
- (void) tool;
+ struct cs_etm_auxtrace *etm = container_of(session->auxtrace,
+ struct cs_etm_auxtrace,
+ auxtrace);
+ if (!etm->data_queued) {
+ struct auxtrace_buffer *buffer;
+ off_t data_offset;
+ int fd = perf_data__fd(session->data);
+ bool is_pipe = perf_data__is_pipe(session->data);
+ int err;
+
+ if (is_pipe)
+ data_offset = 0;
+ else {
+ data_offset = lseek(fd, 0, SEEK_CUR);
+ if (data_offset == -1)
+ return -errno;
+ }
+
+ err = auxtrace_queues__add_event(&etm->queues, session,
+ event, data_offset, &buffer);
+ if (err)
+ return err;
+
+ if (dump_trace)
+ if (auxtrace_buffer__get_data(buffer, fd)) {
+ cs_etm__dump_event(etm, buffer);
+ auxtrace_buffer__put_data(buffer);
+ }
+ }
+
return 0;
}

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