perf: Add support for full Intel event lists v6

perf: Add support for full Intel event lists v6

[Andi Kleen]

[v2: Review feedback addressed and some minor improvements]
[v3: More review feedback addressed and handle test failures better.
Ported to latest tip/core.]
[v4: Addressed Namhyung's feedback]
[v5: Rebase to latest tree. Minor description update.]
[v6: Rebase. Add acked by from Namhyung and address feedback. Some minor
fixes. Should be good to go now I hope. The period patch was dropped,
as that is already handled. I added an extra patch for a --quiet argument
for perf list]

perf has high level events which are useful in many cases. However
there are some tuning situations where low level events in the CPU
are needed. Traditionally this required specifying the event in 
raw form (very awkward) or using non standard frontends
like ocperf or patching in libpfm.

Intel CPUs can have very large event files (Haswell has ~336 core events,
much more if you add uncore or all the offcore combinations), which is too
large to describe through the kernel interface. It would require tying up
significant amounts of unswappable memory for this.

oprofile always had separate event list files that were maintained by 
the CPU vendors. The oprofile events were shipped with the tool.
The Intel events get updated regularly, for example to add references
to the specification updates or add new events.

Unfortunately oprofile usually did not keep up with these updates,
so the events in oprofile were often out of date. In addition
it ties up quite a bit of disk space, mostly for CPUs you don't have.

This patch kit implements another mechanism that avoids these problems.
Intel releases the event lists for CPUs in a standardized JSON format
on a download server.

I implemented an automatic downloader to get the event file for the
current CPU.  The events are stored in ~/.cache/pmu-events.
Then perf adds a parser that converts the JSON format into perf event
aliases, which then can be used directly as any other perf event.

The parsing is done using a simple existing JSON library.

The events are still abstracted for perf, but the abstraction mechanism is
through the downloaded file instead of through the kernel.

The JSON format and perf parser has some minor Intelisms, but they
are simple and small and optional. It's easy to extend, so it would be
possible to use it for other CPUs too, add different pmu attributes, and
add new download sites to the downloader tool.

Currently only core events are supported, uncore may come at a later
point. No kernel changes, all code in perf user tools only.

Some of the parser files are partially shared with separate event parser
library and are thus 2-clause BSD licensed.

Patches also available from
git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc perf/json

Example output:

% perf download 
Downloading models file
Downloading readme.txt
2014-03-05 10:39:33 URL:https://download.01.org/perfmon/readme.txt [10320/10320] -> "readme.txt" [1]
2014-03-05 10:39:34 URL:https://download.01.org/perfmon/mapfile.csv [1207/1207] -> "mapfile.csv" [1]
Downloading events file
% perf list
...
  br_inst_exec.all_branches                          [Speculative and retired
                                                      branches]
  br_inst_exec.all_conditional                       [Speculative and retired
                                                      macro-conditional
                                                      branches]
  br_inst_exec.all_direct_jmp                        [Speculative and retired
                                                      macro-unconditional
                                                      branches excluding
                                                      calls and indirects]
... 333 more new events ...

% perf stat -e br_inst_exec.all_direct_jmp true

 Performance counter stats for 'true':

             6,817      cpu/br_inst_exec.all_direct_jmp/                                   

       0.003503212 seconds time elapsed

One nice feature is that a pointer to the specification update is now
included in the description, which will hopefully clear up many problems:

% perf list
...
  mem_load_uops_l3_hit_retired.xsnp_hit              [Retired load uops which
                                                      data sources were L3
                                                      and cross-core snoop
                                                      hits in on-pkg core
                                                      cache. Supports address
                                                      when precise. Spec
                                                      update: HSM26, HSM30
                                                      (Precise event)]
...


-Andi

[PATCH 1/9] perf, tools: Add jsmn `jasmine' JSON parser v3

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

I need a JSON parser. This adds the simplest JSON
parser I could find -- Serge Zaitsev's jsmn `jasmine' --
to the perf library. I merely converted it to (mostly)
Linux style and added support for non 0 terminated input.

The parser is quite straight forward and does not
copy any data, just returns tokens with offsets
into the input buffer. So it's relatively efficient
and simple to use.

The code is not fully checkpatch clean, but I didn't
want to completely fork the upstream code.

Original source: http://zserge.bitbucket.org/jsmn.html

In addition I added a simple wrapper that mmaps a json
file and provides some straight forward access functions.

Used in follow-on patches to parse event files.

v2: Address review feedback.
v3: Minor checkpatch fixes.
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/Makefile.perf |   4 +
 tools/perf/util/jsmn.c   | 313 +++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/jsmn.h   |  67 ++++++++++
 tools/perf/util/json.c   | 155 +++++++++++++++++++++++
 tools/perf/util/json.h   |  13 ++
 5 files changed, 552 insertions(+)
 create mode 100644 tools/perf/util/jsmn.c
 create mode 100644 tools/perf/util/jsmn.h
 create mode 100644 tools/perf/util/json.c
 create mode 100644 tools/perf/util/json.h

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 9670a16..1cd32c5 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -300,6 +300,8 @@ LIB_H += ui/progress.h
 LIB_H += ui/util.h
 LIB_H += ui/ui.h
 LIB_H += util/data.h
+LIB_H += util/jsmn.h
+LIB_H += util/json.h
 
 LIB_OBJS += $(OUTPUT)util/abspath.o
 LIB_OBJS += $(OUTPUT)util/alias.o
@@ -373,6 +375,8 @@ LIB_OBJS += $(OUTPUT)util/stat.o
 LIB_OBJS += $(OUTPUT)util/record.o
 LIB_OBJS += $(OUTPUT)util/srcline.o
 LIB_OBJS += $(OUTPUT)util/data.o
+LIB_OBJS += $(OUTPUT)util/jsmn.o
+LIB_OBJS += $(OUTPUT)util/json.o
 
 LIB_OBJS += $(OUTPUT)ui/setup.o
 LIB_OBJS += $(OUTPUT)ui/helpline.o
diff --git a/tools/perf/util/jsmn.c b/tools/perf/util/jsmn.c
new file mode 100644
index 0000000..11d1fa1
--- /dev/null
+++ b/tools/perf/util/jsmn.c
@@ -0,0 +1,313 @@
+/*
+ * Copyright (c) 2010 Serge A. Zaitsev
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * Slightly modified by AK to not assume 0 terminated input.
+ */
+
+#include <stdlib.h>
+#include "jsmn.h"
+
+/*
+ * Allocates a fresh unused token from the token pool.
+ */
+static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser,
+				   jsmntok_t *tokens, size_t num_tokens)
+{
+	jsmntok_t *tok;
+
+	if ((unsigned)parser->toknext >= num_tokens)
+		return NULL;
+	tok = &tokens[parser->toknext++];
+	tok->start = tok->end = -1;
+	tok->size = 0;
+	return tok;
+}
+
+/*
+ * Fills token type and boundaries.
+ */
+static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type,
+			    int start, int end)
+{
+	token->type = type;
+	token->start = start;
+	token->end = end;
+	token->size = 0;
+}
+
+/*
+ * Fills next available token with JSON primitive.
+ */
+static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js,
+				      size_t len,
+				      jsmntok_t *tokens, size_t num_tokens)
+{
+	jsmntok_t *token;
+	int start;
+
+	start = parser->pos;
+
+	for (; parser->pos < len; parser->pos++) {
+		switch (js[parser->pos]) {
+#ifndef JSMN_STRICT
+		/*
+		 * In strict mode primitive must be followed by ","
+		 * or "}" or "]"
+		 */
+		case ':':
+#endif
+		case '\t':
+		case '\r':
+		case '\n':
+		case ' ':
+		case ',':
+		case ']':
+		case '}':
+			goto found;
+		default:
+			break;
+		}
+		if (js[parser->pos] < 32 || js[parser->pos] >= 127) {
+			parser->pos = start;
+			return JSMN_ERROR_INVAL;
+		}
+	}
+#ifdef JSMN_STRICT
+	/*
+	 * In strict mode primitive must be followed by a
+	 * comma/object/array.
+	 */
+	parser->pos = start;
+	return JSMN_ERROR_PART;
+#endif
+
+found:
+	token = jsmn_alloc_token(parser, tokens, num_tokens);
+	if (token == NULL) {
+		parser->pos = start;
+		return JSMN_ERROR_NOMEM;
+	}
+	jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos);
+	parser->pos--; /* parent sees closing brackets */
+	return JSMN_SUCCESS;
+}
+
+/*
+ * Fills next token with JSON string.
+ */
+static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js,
+				   size_t len,
+				   jsmntok_t *tokens, size_t num_tokens)
+{
+	jsmntok_t *token;
+	int start = parser->pos;
+
+	/* Skip starting quote */
+	parser->pos++;
+
+	for (; parser->pos < len; parser->pos++) {
+		char c = js[parser->pos];
+
+		/* Quote: end of string */
+		if (c == '\"') {
+			token = jsmn_alloc_token(parser, tokens, num_tokens);
+			if (token == NULL) {
+				parser->pos = start;
+				return JSMN_ERROR_NOMEM;
+			}
+			jsmn_fill_token(token, JSMN_STRING, start+1,
+					parser->pos);
+			return JSMN_SUCCESS;
+		}
+
+		/* Backslash: Quoted symbol expected */
+		if (c == '\\') {
+			parser->pos++;
+			switch (js[parser->pos]) {
+				/* Allowed escaped symbols */
+			case '\"':
+			case '/':
+			case '\\':
+			case 'b':
+			case 'f':
+			case 'r':
+			case 'n':
+			case 't':
+				break;
+				/* Allows escaped symbol \uXXXX */
+			case 'u':
+				/* TODO */
+				break;
+				/* Unexpected symbol */
+			default:
+				parser->pos = start;
+				return JSMN_ERROR_INVAL;
+			}
+		}
+	}
+	parser->pos = start;
+	return JSMN_ERROR_PART;
+}
+
+/*
+ * Parse JSON string and fill tokens.
+ */
+jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, size_t len,
+		     jsmntok_t *tokens, unsigned int num_tokens)
+{
+	jsmnerr_t r;
+	int i;
+	jsmntok_t *token;
+
+	for (; parser->pos < len; parser->pos++) {
+		char c;
+		jsmntype_t type;
+
+		c = js[parser->pos];
+		switch (c) {
+		case '{':
+		case '[':
+			token = jsmn_alloc_token(parser, tokens, num_tokens);
+			if (token == NULL)
+				return JSMN_ERROR_NOMEM;
+			if (parser->toksuper != -1)
+				tokens[parser->toksuper].size++;
+			token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY);
+			token->start = parser->pos;
+			parser->toksuper = parser->toknext - 1;
+			break;
+		case '}':
+		case ']':
+			type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY);
+			for (i = parser->toknext - 1; i >= 0; i--) {
+				token = &tokens[i];
+				if (token->start != -1 && token->end == -1) {
+					if (token->type != type)
+						return JSMN_ERROR_INVAL;
+					parser->toksuper = -1;
+					token->end = parser->pos + 1;
+					break;
+				}
+			}
+			/* Error if unmatched closing bracket */
+			if (i == -1)
+				return JSMN_ERROR_INVAL;
+			for (; i >= 0; i--) {
+				token = &tokens[i];
+				if (token->start != -1 && token->end == -1) {
+					parser->toksuper = i;
+					break;
+				}
+			}
+			break;
+		case '\"':
+			r = jsmn_parse_string(parser, js, len, tokens,
+					      num_tokens);
+			if (r < 0)
+				return r;
+			if (parser->toksuper != -1)
+				tokens[parser->toksuper].size++;
+			break;
+		case '\t':
+		case '\r':
+		case '\n':
+		case ':':
+		case ',':
+		case ' ':
+			break;
+#ifdef JSMN_STRICT
+			/*
+			 * In strict mode primitives are:
+			 * numbers and booleans.
+			 */
+		case '-':
+		case '0':
+		case '1':
+		case '2':
+		case '3':
+		case '4':
+		case '5':
+		case '6':
+		case '7':
+		case '8':
+		case '9':
+		case 't':
+		case 'f':
+		case 'n':
+#else
+			/*
+			 * In non-strict mode every unquoted value
+			 * is a primitive.
+			 */
+			/*FALL THROUGH */
+		default:
+#endif
+			r = jsmn_parse_primitive(parser, js, len, tokens,
+						 num_tokens);
+			if (r < 0)
+				return r;
+			if (parser->toksuper != -1)
+				tokens[parser->toksuper].size++;
+			break;
+
+#ifdef JSMN_STRICT
+			/* Unexpected char in strict mode */
+		default:
+			return JSMN_ERROR_INVAL;
+#endif
+		}
+	}
+
+	for (i = parser->toknext - 1; i >= 0; i--) {
+		/* Unmatched opened object or array */
+		if (tokens[i].start != -1 && tokens[i].end == -1)
+			return JSMN_ERROR_PART;
+	}
+
+	return JSMN_SUCCESS;
+}
+
+/*
+ * Creates a new parser based over a given  buffer with an array of tokens
+ * available.
+ */
+void jsmn_init(jsmn_parser *parser)
+{
+	parser->pos = 0;
+	parser->toknext = 0;
+	parser->toksuper = -1;
+}
+
+const char *jsmn_strerror(jsmnerr_t err)
+{
+	switch (err) {
+	case JSMN_ERROR_NOMEM:
+		return "No enough tokens";
+	case JSMN_ERROR_INVAL:
+		return "Invalid character inside JSON string";
+	case JSMN_ERROR_PART:
+		return "The string is not a full JSON packet, more bytes expected";
+	case JSMN_SUCCESS:
+		return "Success";
+	default:
+		return "Unknown json error";
+	}
+}
diff --git a/tools/perf/util/jsmn.h b/tools/perf/util/jsmn.h
new file mode 100644
index 0000000..d666b10
--- /dev/null
+++ b/tools/perf/util/jsmn.h
@@ -0,0 +1,67 @@
+#ifndef __JSMN_H_
+#define __JSMN_H_
+
+/*
+ * JSON type identifier. Basic types are:
+ *	o Object
+ *	o Array
+ *	o String
+ *	o Other primitive: number, boolean (true/false) or null
+ */
+typedef enum {
+	JSMN_PRIMITIVE = 0,
+	JSMN_OBJECT = 1,
+	JSMN_ARRAY = 2,
+	JSMN_STRING = 3
+} jsmntype_t;
+
+typedef enum {
+	/* Not enough tokens were provided */
+	JSMN_ERROR_NOMEM = -1,
+	/* Invalid character inside JSON string */
+	JSMN_ERROR_INVAL = -2,
+	/* The string is not a full JSON packet, more bytes expected */
+	JSMN_ERROR_PART = -3,
+	/* Everything was fine */
+	JSMN_SUCCESS = 0
+} jsmnerr_t;
+
+/*
+ * JSON token description.
+ * @param		type	type (object, array, string etc.)
+ * @param		start	start position in JSON data string
+ * @param		end		end position in JSON data string
+ */
+typedef struct {
+	jsmntype_t type;
+	int start;
+	int end;
+	int size;
+} jsmntok_t;
+
+/*
+ * JSON parser. Contains an array of token blocks available. Also stores
+ * the string being parsed now and current position in that string
+ */
+typedef struct {
+	unsigned int pos; /* offset in the JSON string */
+	int toknext; /* next token to allocate */
+	int toksuper; /* superior token node, e.g parent object or array */
+} jsmn_parser;
+
+/*
+ * Create JSON parser over an array of tokens
+ */
+void jsmn_init(jsmn_parser *parser);
+
+/*
+ * Run JSON parser. It parses a JSON data string into and array of tokens,
+ * each describing a single JSON object.
+ */
+jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js,
+		     size_t len,
+		     jsmntok_t *tokens, unsigned int num_tokens);
+
+const char *jsmn_strerror(jsmnerr_t err);
+
+#endif /* __JSMN_H_ */
diff --git a/tools/perf/util/json.c b/tools/perf/util/json.c
new file mode 100644
index 0000000..cac1b83
--- /dev/null
+++ b/tools/perf/util/json.c
@@ -0,0 +1,155 @@
+/* Parse JSON files using the JSMN parser. */
+
+/*
+ * Copyright (c) 2014, Intel Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include "jsmn.h"
+#include "json.h"
+#include <linux/kernel.h>
+
+static char *mapfile(const char *fn, size_t *size)
+{
+	unsigned ps = sysconf(_SC_PAGESIZE);
+	struct stat st;
+	char *map = NULL;
+	int err;
+	int fd = open(fn, O_RDONLY);
+
+	if (fd < 0)
+		return NULL;
+	err = fstat(fd, &st);
+	if (err < 0)
+		goto out;
+	*size = st.st_size;
+	map = mmap(NULL,
+		   (st.st_size + ps - 1) & ~(ps - 1),
+		   PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if (map == MAP_FAILED)
+		map = NULL;
+out:
+	close(fd);
+	return map;
+}
+
+static void unmapfile(char *map, size_t size)
+{
+	unsigned ps = sysconf(_SC_PAGESIZE);
+	munmap(map, roundup(size, ps));
+}
+
+/*
+ * Parse json file using jsmn. Return array of tokens,
+ * and mapped file. Caller needs to free array.
+ */
+jsmntok_t *parse_json(const char *fn, char **map, size_t *size, int *len)
+{
+	jsmn_parser parser;
+	jsmntok_t *tokens;
+	jsmnerr_t res;
+	unsigned sz;
+
+	*map = mapfile(fn, size);
+	if (!*map)
+		return NULL;
+	/* Heuristic */
+	sz = *size * 16;
+	tokens = malloc(sz);
+	if (!tokens)
+		goto error;
+	jsmn_init(&parser);
+	res = jsmn_parse(&parser, *map, *size, tokens,
+			 sz / sizeof(jsmntok_t));
+	if (res != JSMN_SUCCESS) {
+		pr_err("%s: json error %s\n", fn, jsmn_strerror(res));
+		goto error_free;
+	}
+	if (len)
+		*len = parser.toknext;
+	return tokens;
+error_free:
+	free(tokens);
+error:
+	unmapfile(*map, *size);
+	return NULL;
+}
+
+void free_json(char *map, size_t size, jsmntok_t *tokens)
+{
+	free(tokens);
+	unmapfile(map, size);
+}
+
+static int countchar(char *map, char c, int end)
+{
+	int i;
+	int count = 0;
+	for (i = 0; i < end; i++)
+		if (map[i] == c)
+			count++;
+	return count;
+}
+
+/* Return line number of a jsmn token */
+int json_line(char *map, jsmntok_t *t)
+{
+	return countchar(map, '\n', t->start) + 1;
+}
+
+static const char * const jsmn_types[] = {
+	[JSMN_PRIMITIVE] = "primitive",
+	[JSMN_ARRAY] = "array",
+	[JSMN_OBJECT] = "object",
+	[JSMN_STRING] = "string"
+};
+
+#define LOOKUP(a, i) ((i) < (sizeof(a)/sizeof(*(a))) ? ((a)[i]) : "?")
+
+/* Return type name of a jsmn token */
+const char *json_name(jsmntok_t *t)
+{
+	return LOOKUP(jsmn_types, t->type);
+}
+
+int json_len(jsmntok_t *t)
+{
+	return t->end - t->start;
+}
+
+/* Is string t equal to s? */
+int json_streq(char *map, jsmntok_t *t, const char *s)
+{
+	unsigned len = json_len(t);
+	return len == strlen(s) && !strncasecmp(map + t->start, s, len);
+}
diff --git a/tools/perf/util/json.h b/tools/perf/util/json.h
new file mode 100644
index 0000000..37dd9e9
--- /dev/null
+++ b/tools/perf/util/json.h
@@ -0,0 +1,13 @@
+#ifndef JSON_H
+#define JSON_H 1
+
+#include "jsmn.h"
+
+jsmntok_t *parse_json(const char *fn, char **map, size_t *size, int *len);
+void free_json(char *map, size_t size, jsmntok_t *tokens);
+int json_line(char *map, jsmntok_t *t);
+const char *json_name(jsmntok_t *t);
+int json_streq(char *map, jsmntok_t *t, const char *s);
+int json_len(jsmntok_t *t);
+
+#endif
-- 
1.9.3

[PATCH 2/9] perf, tools: Add support for text descriptions of events and alias add

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

Change pmu.c to allow descriptions of events and add interfaces
to add aliases at runtime from another file. To be used by jevents in the
next patch.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/util/pmu.c | 127 ++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 98 insertions(+), 29 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 7a811eb..baec090 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -14,6 +14,7 @@
 
 struct perf_pmu_alias {
 	char *name;
+	char *desc;
 	struct list_head terms;
 	struct list_head list;
 	char unit[UNIT_MAX_LEN+1];
@@ -171,17 +172,12 @@ error:
 	return -1;
 }
 
-static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
+static int __perf_pmu__new_alias(struct list_head *list, char *name,
+				 char *dir, char *desc, char *val)
 {
 	struct perf_pmu_alias *alias;
-	char buf[256];
 	int ret;
 
-	ret = fread(buf, 1, sizeof(buf), file);
-	if (ret == 0)
-		return -EINVAL;
-	buf[ret] = 0;
-
 	alias = malloc(sizeof(*alias));
 	if (!alias)
 		return -ENOMEM;
@@ -190,24 +186,45 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
 	alias->scale = 1.0;
 	alias->unit[0] = '\0';
 
-	ret = parse_events_terms(&alias->terms, buf);
+	ret = parse_events_terms(&alias->terms, val);
 	if (ret) {
+		pr_err("Cannot parse alias %s: %d\n", val, ret);
 		free(alias);
 		return ret;
 	}
 
 	alias->name = strdup(name);
-	/*
-	 * load unit name and scale if available
-	 */
-	perf_pmu__parse_unit(alias, dir, name);
-	perf_pmu__parse_scale(alias, dir, name);
 
+	if (dir) {
+		/*
+		 * load unit name and scale if available
+		 */
+		perf_pmu__parse_unit(alias, dir, name);
+		perf_pmu__parse_scale(alias, dir, name);
+	}
+
+	alias->desc = desc ? strdup(desc) : NULL;
 	list_add_tail(&alias->list, list);
 
 	return 0;
 }
 
+static int perf_pmu__new_alias(struct list_head *list,
+			       char *dir,
+			       char *name,
+			       FILE *file)
+{
+	char buf[256];
+	int ret;
+
+	ret = fread(buf, 1, sizeof(buf), file);
+	if (ret == 0)
+		return -EINVAL;
+	buf[ret] = 0;
+
+	return __perf_pmu__new_alias(list, name, dir, NULL, buf);
+}
+
 /*
  * Process all the sysfs attributes located under the directory
  * specified in 'dir' parameter.
@@ -720,11 +737,51 @@ static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
 	return buf;
 }
 
-static int cmp_string(const void *a, const void *b)
+struct pair {
+	char *name;
+	char *desc;
+};
+
+static int cmp_pair(const void *a, const void *b)
+{
+	const struct pair *as = a;
+	const struct pair *bs = b;
+
+	/* Put downloaded event list last */
+	if (!!as->desc != !!bs->desc)
+		return !!as->desc - !!bs->desc;
+	return strcmp(as->name, bs->name);
+}
+
+static void wordwrap(char *s, int start, int max, int corr)
 {
-	const char * const *as = a;
-	const char * const *bs = b;
-	return strcmp(*as, *bs);
+	int column = start;
+	int n;
+
+	while (*s) {
+		int wlen = strcspn(s, " \t");
+
+		if (column + wlen >= max && column > start) {
+			printf("\n%*s", start, "");
+			column = start + corr;
+		}
+		n = printf("%s%.*s", column > start ? " " : "", wlen, s);
+		if (n <= 0)
+			break;
+		s += wlen;
+		column += n;
+		while (isspace(*s))
+			s++;
+	}
+}
+
+static int get_columns(void)
+{
+	/*
+	 * Should ask the terminal with TIOCGWINSZ here, but we
+	 * need the original fd before the pager.
+	 */
+	return 79;
 }
 
 void print_pmu_events(const char *event_glob, bool name_only)
@@ -734,21 +791,24 @@ void print_pmu_events(const char *event_glob, bool name_only)
 	char buf[1024];
 	int printed = 0;
 	int len, j;
-	char **aliases;
+	struct pair *aliases;
+	int numdesc = 0;
+	int columns = get_columns();
 
 	pmu = NULL;
 	len = 0;
 	while ((pmu = perf_pmu__scan(pmu)) != NULL)
 		list_for_each_entry(alias, &pmu->aliases, list)
 			len++;
-	aliases = malloc(sizeof(char *) * len);
+	aliases = malloc(sizeof(struct pair) * len);
 	if (!aliases)
 		return;
 	pmu = NULL;
 	j = 0;
 	while ((pmu = perf_pmu__scan(pmu)) != NULL)
 		list_for_each_entry(alias, &pmu->aliases, list) {
-			char *name = format_alias(buf, sizeof(buf), pmu, alias);
+			char *name = alias->desc ? alias->name :
+				format_alias(buf, sizeof(buf), pmu, alias);
 			bool is_cpu = !strcmp(pmu->name, "cpu");
 
 			if (event_glob != NULL &&
@@ -756,22 +816,31 @@ void print_pmu_events(const char *event_glob, bool name_only)
 			      (!is_cpu && strglobmatch(alias->name,
 						       event_glob))))
 				continue;
-			aliases[j] = name;
-			if (is_cpu && !name_only)
-				aliases[j] = format_alias_or(buf, sizeof(buf),
-							      pmu, alias);
-			aliases[j] = strdup(aliases[j]);
+			aliases[j].name = name;
+			if (is_cpu && !name_only && !alias->desc)
+				aliases[j].name = format_alias_or(buf,
+								  sizeof(buf),
+								  pmu, alias);
+			aliases[j].name = strdup(aliases[j].name);
+			aliases[j].desc = alias->desc;
 			j++;
 		}
 	len = j;
-	qsort(aliases, len, sizeof(char *), cmp_string);
+	qsort(aliases, len, sizeof(struct pair), cmp_pair);
 	for (j = 0; j < len; j++) {
 		if (name_only) {
-			printf("%s ", aliases[j]);
+			printf("%s ", aliases[j].name);
 			continue;
 		}
-		printf("  %-50s [Kernel PMU event]\n", aliases[j]);
-		zfree(&aliases[j]);
+		if (aliases[j].desc) {
+			if (numdesc++ == 0 && printed)
+				printf("\n");
+			printf("  %-50s [", aliases[j].name);
+			wordwrap(aliases[j].desc, 53, columns, 1);
+			printf("]\n");
+		} else
+			printf("  %-50s [Kernel PMU event]\n", aliases[j].name);
+		zfree(&aliases[j].name);
 		printed++;
 	}
 	if (printed)
-- 
1.9.3

[PATCH 3/9] perf, tools: Add support for reading JSON event files v3

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

Add a parser for Intel style JSON event files. This allows
to use an Intel event list directly with perf. The Intel
event lists can be quite large and are too big to store
in unswappable kernel memory.

The parser code knows how to convert the JSON fields
to perf fields. The conversion code is straight forward.
It knows (very little) Intel specific information, and can be easily
extended to handle fields for other CPUs.

The parser code is partially shared with an independent parsing
library, which is 2-clause BSD licenced. To avoid any conflicts I marked
those files as BSD licenced too. As part of perf they become GPLv2.

The events are handled using the existing alias machinery.

We output the BriefDescription in perf list.

Right now the json file can be specified as an argument
to perf stat/record/list. Followon patches will automate this.

JSON files look like this:

[
  {
    "EventCode": "0x00",
    "UMask": "0x01",
    "EventName": "INST_RETIRED.ANY",
    "BriefDescription": "Instructions retired from execution.",
    "PublicDescription": "Instructions retired from execution.",
    "Counter": "Fixed counter 1",
    "CounterHTOff": "Fixed counter 1",
    "SampleAfterValue": "2000003",
    "MSRIndex": "0",
    "MSRValue": "0",
    "TakenAlone": "0",
    "CounterMask": "0",
    "Invert": "0",
    "AnyThread": "0",
    "EdgeDetect": "0",
    "PEBS": "0",
    "PRECISE_STORE": "0",
    "Errata": "null",
    "Offcore": "0"
  },

v2: Address review feedback. Rename option to --event-files
v3: Add JSON example
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/Documentation/perf-list.txt   |   6 +
 tools/perf/Documentation/perf-record.txt |   3 +
 tools/perf/Documentation/perf-stat.txt   |   3 +
 tools/perf/Makefile.perf                 |   2 +
 tools/perf/builtin-list.c                |   2 +
 tools/perf/builtin-record.c              |   3 +
 tools/perf/builtin-stat.c                |   2 +
 tools/perf/util/jevents.c                | 250 +++++++++++++++++++++++++++++++
 tools/perf/util/jevents.h                |   3 +
 tools/perf/util/pmu.c                    |  14 ++
 tools/perf/util/pmu.h                    |   2 +
 11 files changed, 290 insertions(+)
 create mode 100644 tools/perf/util/jevents.c
 create mode 100644 tools/perf/util/jevents.h

diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index 6fce6a6..9305a37 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -15,6 +15,12 @@ DESCRIPTION
 This command displays the symbolic event types which can be selected in the
 various perf commands with the -e option.
 
+OPTIONS
+-------
+--events-file=::
+Specify JSON event list file to use for parsing events.
+
+
 [[EVENT_MODIFIERS]]
 EVENT MODIFIERS
 ---------------
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index d460049..59778f4 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -214,6 +214,9 @@ if combined with -a or -C options.
 After starting the program, wait msecs before measuring. This is useful to
 filter out the startup phase of the program, which is often very different.
 
+--events-file=::
+Specify JSON event list file to use for parsing events.
+
 SEE ALSO
 --------
 linkperf:perf-stat[1], linkperf:perf-list[1]
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 29ee857..7adbb08 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -142,6 +142,9 @@ filter out the startup phase of the program, which is often very different.
 
 Print statistics of transactional execution if supported.
 
+--events-file=::
+Specify JSON event list file to use for parsing events.
+
 EXAMPLES
 --------
 
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 1cd32c5..0016d1a 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -302,6 +302,7 @@ LIB_H += ui/ui.h
 LIB_H += util/data.h
 LIB_H += util/jsmn.h
 LIB_H += util/json.h
+LIB_H += util/jevents.h
 
 LIB_OBJS += $(OUTPUT)util/abspath.o
 LIB_OBJS += $(OUTPUT)util/alias.o
@@ -377,6 +378,7 @@ LIB_OBJS += $(OUTPUT)util/srcline.o
 LIB_OBJS += $(OUTPUT)util/data.o
 LIB_OBJS += $(OUTPUT)util/jsmn.o
 LIB_OBJS += $(OUTPUT)util/json.o
+LIB_OBJS += $(OUTPUT)util/jevents.o
 
 LIB_OBJS += $(OUTPUT)ui/setup.o
 LIB_OBJS += $(OUTPUT)ui/helpline.o
diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 011195e..086c96f 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -20,6 +20,8 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	int i;
 	const struct option list_options[] = {
+		OPT_STRING(0, "events-file", &json_file, "json file",
+			   "Read event json file"),
 		OPT_END()
 	};
 	const char * const list_usage[] = {
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 378b85b..f22f27c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -25,6 +25,7 @@
 #include "util/cpumap.h"
 #include "util/thread_map.h"
 #include "util/data.h"
+#include "util/pmu.h"
 
 #include <unistd.h>
 #include <sched.h>
@@ -876,6 +877,8 @@ const struct option record_options[] = {
 		    "sample transaction flags (special events only)"),
 	OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
 		    "use per-thread mmaps"),
+	OPT_STRING(0, "events-file", &json_file, "json file",
+		   "Read event json file"),
 	OPT_END()
 };
 
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 65a151e..8ea9c3a 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1668,6 +1668,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
 		     "aggregate counts per physical processor core", AGGR_CORE),
 	OPT_UINTEGER('D', "delay", &initial_delay,
 		     "ms to wait before starting measurement after program start"),
+	OPT_STRING(0, "events-file", &json_file, "json file",
+		   "Read event json file"),
 	OPT_END()
 	};
 	const char * const stat_usage[] = {
diff --git a/tools/perf/util/jevents.c b/tools/perf/util/jevents.c
new file mode 100644
index 0000000..943a1fc
--- /dev/null
+++ b/tools/perf/util/jevents.c
@@ -0,0 +1,250 @@
+/* Parse event JSON files */
+
+/*
+ * Copyright (c) 2014, Intel Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+#include "jsmn.h"
+#include "json.h"
+#include "jevents.h"
+
+static void addfield(char *map, char **dst, const char *sep,
+		     const char *a, jsmntok_t *bt)
+{
+	unsigned len = strlen(a) + 1 + strlen(sep);
+	int olen = *dst ? strlen(*dst) : 0;
+	int blen = bt ? json_len(bt) : 0;
+	char *out;
+
+	out = realloc(*dst, len + olen + blen);
+	if (!out)
+		return;
+	*dst = out;
+
+	if (!olen)
+		*(*dst) = 0;
+	else
+		strcat(*dst, sep);
+	strcat(*dst, a);
+	if (bt)
+		strncat(*dst, map + bt->start, blen);
+}
+
+static void fixname(char *s)
+{
+	for (; *s; s++) {
+		*s = tolower(*s);
+		/*
+		 * Remove '.' for now, until the parser
+		 * can deal with it.
+		 */
+		if (*s == '.')
+			*s = '_';
+	}
+}
+
+static void fixdesc(char *s)
+{
+	char *e = s + strlen(s);
+
+	/* Remove trailing dots that look ugly in perf list */
+	--e;
+	while (e >= s && isspace(*e))
+		--e;
+	if (*e == '.')
+		*e = 0;
+}
+
+static struct msrmap {
+	const char *num;
+	const char *pname;
+} msrmap[] = {
+	{ "0x3F6", "ldlat=" },
+	{ "0x1A6", "offcore_rsp=" },
+	{ "0x1A7", "offcore_rsp=" },
+	{ NULL, NULL }
+};
+
+static struct field {
+	const char *field;
+	const char *kernel;
+} fields[] = {
+	{ "EventCode",	"event=" },
+	{ "UMask",	"umask=" },
+	{ "CounterMask", "cmask=" },
+	{ "Invert",	"inv=" },
+	{ "AnyThread",	"any=" },
+	{ "EdgeDetect",	"edge=" },
+	{ "SampleAfterValue", "period=" },
+	{ NULL, NULL }
+};
+
+static void cut_comma(char *map, jsmntok_t *newval)
+{
+	int i;
+
+	/* Cut off everything after comma */
+	for (i = newval->start; i < newval->end; i++) {
+		if (map[i] == ',')
+			newval->end = i;
+	}
+}
+
+static int match_field(char *map, jsmntok_t *field, int nz,
+		       char **event, jsmntok_t *val)
+{
+	struct field *f;
+	jsmntok_t newval = *val;
+
+	for (f = fields; f->field; f++)
+		if (json_streq(map, field, f->field) && nz) {
+			cut_comma(map, &newval);
+			addfield(map, event, ",", f->kernel, &newval);
+			return 1;
+		}
+	return 0;
+}
+
+static struct msrmap *lookup_msr(char *map, jsmntok_t *val)
+{
+	jsmntok_t newval = *val;
+	static bool warned;
+	int i;
+
+	cut_comma(map, &newval);
+	for (i = 0; msrmap[i].num; i++)
+		if (json_streq(map, &newval, msrmap[i].num))
+			return &msrmap[i];
+	if (!warned) {
+		warned = true;
+		pr_err("Unknown MSR in event file %.*s\n",
+			json_len(val), map + val->start);
+	}
+	return NULL;
+}
+
+#define EXPECT(e, t, m) do { if (!(e)) {			\
+	jsmntok_t *loc = (t);					\
+	if (!(t)->start && (t) > tokens)			\
+		loc = (t) - 1;					\
+		pr_err("%s:%d: " m ", got %s\n", fn,		\
+			json_line(map, loc),			\
+			json_name(t));				\
+	goto out_free;						\
+} } while (0)
+
+/* Call func with each event in the json file */
+
+int json_events(const char *fn,
+	  int (*func)(void *data, char *name, char *event, char *desc),
+	  void *data)
+{
+	int err = -EIO;
+	size_t size;
+	jsmntok_t *tokens, *tok;
+	int i, j, len;
+	char *map;
+
+	tokens = parse_json(fn, &map, &size, &len);
+	if (!tokens)
+		return -EIO;
+	EXPECT(tokens->type == JSMN_ARRAY, tokens, "expected top level array");
+	tok = tokens + 1;
+	for (i = 0; i < tokens->size; i++) {
+		char *event = NULL, *desc = NULL, *name = NULL;
+		struct msrmap *msr = NULL;
+		jsmntok_t *msrval = NULL;
+		jsmntok_t *precise = NULL;
+		jsmntok_t *obj = tok++;
+
+		EXPECT(obj->type == JSMN_OBJECT, obj, "expected object");
+		for (j = 0; j < obj->size; j += 2) {
+			jsmntok_t *field, *val;
+			int nz;
+
+			field = tok + j;
+			EXPECT(field->type == JSMN_STRING, tok + j,
+			       "Expected field name");
+			val = tok + j + 1;
+			EXPECT(val->type == JSMN_STRING, tok + j + 1,
+			       "Expected string value");
+
+			nz = !json_streq(map, val, "0");
+			if (match_field(map, field, nz, &event, val)) {
+				/* ok */
+			} else if (json_streq(map, field, "EventName")) {
+				addfield(map, &name, "", "", val);
+			} else if (json_streq(map, field, "BriefDescription")) {
+				addfield(map, &desc, "", "", val);
+				fixdesc(desc);
+			} else if (json_streq(map, field, "PEBS") && nz) {
+				precise = val;
+			} else if (json_streq(map, field, "MSRIndex") && nz) {
+				msr = lookup_msr(map, val);
+			} else if (json_streq(map, field, "MSRValue")) {
+				msrval = val;
+			} else if (json_streq(map, field, "Errata") &&
+				   !json_streq(map, val, "null")) {
+				addfield(map, &desc, ". ",
+					" Spec update: ", val);
+			} else if (json_streq(map, field, "Data_LA") && nz) {
+				addfield(map, &desc, ". ",
+					" Supports address when precise",
+					NULL);
+			}
+			/* ignore unknown fields */
+		}
+		if (precise && !strstr(desc, "(Precise Event)")) {
+			if (json_streq(map, precise, "2"))
+				addfield(map, &desc, " ", "(Must be precise)",
+						NULL);
+			else
+				addfield(map, &desc, " ",
+						"(Precise event)", NULL);
+		}
+		if (msr != NULL)
+			addfield(map, &event, ",", msr->pname, msrval);
+		fixname(name);
+		err = func(data, name, event, desc);
+		free(event);
+		free(desc);
+		free(name);
+		if (err)
+			break;
+		tok += j;
+	}
+	EXPECT(tok - tokens == len, tok, "unexpected objects at end");
+	err = 0;
+out_free:
+	free_json(map, size, tokens);
+	return err;
+}
diff --git a/tools/perf/util/jevents.h b/tools/perf/util/jevents.h
new file mode 100644
index 0000000..4c2b879
--- /dev/null
+++ b/tools/perf/util/jevents.h
@@ -0,0 +1,3 @@
+int json_events(const char *fn,
+		int (*func)(void *data, char *name, char *event, char *desc),
+		void *data);
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index baec090..9f154af 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -9,6 +9,9 @@
 #include "pmu.h"
 #include "parse-events.h"
 #include "cpumap.h"
+#include "jevents.h"
+
+const char *json_file;
 
 #define UNIT_MAX_LEN	31 /* max length for event unit name */
 
@@ -273,6 +276,14 @@ static int pmu_aliases_parse(char *dir, struct list_head *head)
 	return ret;
 }
 
+static int add_alias(void *data, char *name, char *event, char *desc)
+{
+	struct list_head *head = (struct list_head *)data;
+
+	__perf_pmu__new_alias(head, name, NULL, desc, event);
+	return 0;
+}
+
 /*
  * Reading the pmu event aliases definition, which should be located at:
  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
@@ -422,6 +433,9 @@ static struct perf_pmu *pmu_lookup(const char *name)
 	if (pmu_aliases(name, &aliases))
 		return NULL;
 
+	if (!strcmp(name, "cpu") && json_file)
+		json_events(json_file, add_alias, &aliases);
+
 	if (pmu_type(name, &type))
 		return NULL;
 
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index c14a543..583d21e 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -46,4 +46,6 @@ void print_pmu_events(const char *event_glob, bool name_only);
 bool pmu_have_event(const char *pname, const char *name);
 
 int perf_pmu__test(void);
+
+extern const char *json_file;
 #endif /* __PMU_H */
-- 
1.9.3

[PATCH 4/9] perf, tools: Automatically look for event file name for cpu v3

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

When no JSON event file is specified automatically look
for a suitable file in ~/.cache/pmu-events. A "perf download" can
automatically add files there for the current CPUs.

This does not include the actual event files with perf,
but they can be automatically downloaded instead
(implemented in the next patch)

This has the advantage that the events can be always uptodate,
because they are freshly downloaded. In oprofile we always
had problems with out of date or incomplete events files.

The event file format is per architecture, but can be
extended for other architectures.

v2: Supports XDG_CACHE_HOME and defaults to ~/.cache/pmu-events
v3: Minor updates and handle EVENTMAP.
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/arch/x86/Makefile      |  1 +
 tools/perf/arch/x86/util/cpustr.c | 34 ++++++++++++++++++++++++++++++++
 tools/perf/util/jevents.c         | 41 +++++++++++++++++++++++++++++++++++++++
 tools/perf/util/jevents.h         |  1 +
 tools/perf/util/pmu.c             |  2 +-
 5 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 tools/perf/arch/x86/util/cpustr.c

diff --git a/tools/perf/arch/x86/Makefile b/tools/perf/arch/x86/Makefile
index 1641542..0efeb14 100644
--- a/tools/perf/arch/x86/Makefile
+++ b/tools/perf/arch/x86/Makefile
@@ -14,4 +14,5 @@ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o
 endif
 LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/header.o
 LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/tsc.o
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/cpustr.o
 LIB_H += arch/$(ARCH)/util/tsc.h
diff --git a/tools/perf/arch/x86/util/cpustr.c b/tools/perf/arch/x86/util/cpustr.c
new file mode 100644
index 0000000..e1cd76c
--- /dev/null
+++ b/tools/perf/arch/x86/util/cpustr.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "../../util/jevents.h"
+
+char *get_cpu_str(void)
+{
+	char *line = NULL;
+	size_t llen = 0;
+	int found = 0, n;
+	char vendor[30];
+	int model, fam;
+	char *res = NULL;
+	FILE *f = fopen("/proc/cpuinfo", "r");
+
+	if (!f)
+		return NULL;
+	while (getline(&line, &llen, f) > 0) {
+		if (sscanf(line, "vendor_id : %30s", vendor) == 1)
+			found++;
+		else if (sscanf(line, "model : %d", &model) == 1)
+			found++;
+		else if (sscanf(line, "cpu family : %d", &fam) == 1)
+			found++;
+		if (found == 3) {
+			n = asprintf(&res, "%s-%d-%X-core", vendor, fam, model);
+			if (n < 0)
+				res = NULL;
+			break;
+		}
+	}
+	free(line);
+	fclose(f);
+	return res;
+}
diff --git a/tools/perf/util/jevents.c b/tools/perf/util/jevents.c
index 943a1fc..1fae0b7 100644
--- a/tools/perf/util/jevents.c
+++ b/tools/perf/util/jevents.c
@@ -33,10 +33,49 @@
 #include <errno.h>
 #include <string.h>
 #include <ctype.h>
+#include "cache.h"
 #include "jsmn.h"
 #include "json.h"
 #include "jevents.h"
 
+__attribute__((weak)) char *get_cpu_str(void)
+{
+	return NULL;
+}
+
+static const char *json_default_name(void)
+{
+	char *cache;
+	char *idstr = get_cpu_str();
+	char *res = NULL;
+	char *home = NULL;
+	char *emap;
+
+	emap = getenv("EVENTMAP");
+	if (emap) {
+		if (access(emap, R_OK) == 0)
+			return emap;
+		if (asprintf(&idstr, "%s-core", emap) < 0)
+			return NULL;
+	}
+
+	cache = getenv("XDG_CACHE_HOME");
+	if (!cache) {
+		home = getenv("HOME");
+		if (!home || asprintf(&cache, "%s/.cache", home) < 0)
+			goto out;
+	}
+	if (cache && idstr)
+		res = mkpath("%s/pmu-events/%s.json",
+			     cache,
+			     idstr);
+	if (home)
+		free(cache);
+out:
+	free(idstr);
+	return res;
+}
+
 static void addfield(char *map, char **dst, const char *sep,
 		     const char *a, jsmntok_t *bt)
 {
@@ -174,6 +213,8 @@ int json_events(const char *fn,
 	int i, j, len;
 	char *map;
 
+	if (!fn)
+		fn = json_default_name();
 	tokens = parse_json(fn, &map, &size, &len);
 	if (!tokens)
 		return -EIO;
diff --git a/tools/perf/util/jevents.h b/tools/perf/util/jevents.h
index 4c2b879..6a377a8 100644
--- a/tools/perf/util/jevents.h
+++ b/tools/perf/util/jevents.h
@@ -1,3 +1,4 @@
 int json_events(const char *fn,
 		int (*func)(void *data, char *name, char *event, char *desc),
 		void *data);
+char *get_cpu_str(void);
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 9f154af..fa21319 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -433,7 +433,7 @@ static struct perf_pmu *pmu_lookup(const char *name)
 	if (pmu_aliases(name, &aliases))
 		return NULL;
 
-	if (!strcmp(name, "cpu") && json_file)
+	if (!strcmp(name, "cpu"))
 		json_events(json_file, add_alias, &aliases);
 
 	if (pmu_type(name, &type))
-- 
1.9.3

[PATCH 5/9] perf, tools: Add perf download to download event files v4

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

Add a downloader to automatically download the right
files from a download site.

This is implemented as a script calling wget, similar to
perf archive. The perf driver automatically calls the right
binary. The downloader is extensible, but currently only
implements an Intel event download.  It would be straightforward
to add other sites too for other vendors.

The downloaded event files are put into ~/.cache/pmu-events, where the
builtin event parser in util/* can find them automatically.

v2: Use ~/.cache
v3: Check for wget. Some cleanups.
v4: Improve manpage.
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/Documentation/perf-download.txt | 31 ++++++++++++++++
 tools/perf/Documentation/perf-list.txt     | 12 ++++++-
 tools/perf/Makefile.perf                   |  5 ++-
 tools/perf/perf-download.sh                | 57 ++++++++++++++++++++++++++++++
 4 files changed, 103 insertions(+), 2 deletions(-)
 create mode 100644 tools/perf/Documentation/perf-download.txt
 create mode 100755 tools/perf/perf-download.sh

diff --git a/tools/perf/Documentation/perf-download.txt b/tools/perf/Documentation/perf-download.txt
new file mode 100644
index 0000000..9e5b28e
--- /dev/null
+++ b/tools/perf/Documentation/perf-download.txt
@@ -0,0 +1,31 @@
+perf-download(1)
+===============
+
+NAME
+----
+perf-download - Download event files for current CPU.
+
+SYNOPSIS
+--------
+[verse]
+'perf download' [vendor-family-model]
+
+DESCRIPTION
+-----------
+This command automatically downloads the event list for the current CPU and
+stores them in $XDG_CACHE_HOME/pmu-events (or $HOME/.cache/pmu-events).
+The other tools automatically look for them there. The CPU can be also
+specified at the command line.
+
+The downloading is done using http through wget, which needs
+to be installed. When behind a firewall the proxies
+may also need to be set up using "export https_proxy=...."
+
+The user should regularly call this to download updated event lists
+for the current CPU.
+
+Note the downloaded files are stored per user, so if perf is
+used as both normal user and with sudo the event files may
+also need to be moved to root's home directory with
+sudo mkdir /root/.cache ; sud cp -r ~/.cache/pmu-events /root/.cache
+after downloading.
diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index 9305a37..2b4eba0 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -61,6 +61,16 @@ Sampling). Examples to use IBS:
  perf record -a -e r076:p ...          # same as -e cpu-cycles:p
  perf record -a -e r0C1:p ...          # use ibs op counting micro-ops
 
+PER CPU EVENT LISTS
+-------------------
+
+For some CPUs (particularly modern Intel CPUs) "perf download" can
+download additional CPU specific event definitions, which then
+become visible in perf list and available in the other perf tools.
+
+This obsoletes the raw event description method described below
+for most cases.
+
 RAW HARDWARE EVENT DESCRIPTOR
 -----------------------------
 Even when an event is not available in a symbolic form within perf right now,
@@ -123,6 +133,6 @@ types specified.
 SEE ALSO
 --------
 linkperf:perf-stat[1], linkperf:perf-top[1],
-linkperf:perf-record[1],
+linkperf:perf-record[1], linkperf:perf-download[1],
 http://www.intel.com/Assets/PDF/manual/253669.pdf[Intel® 64 and IA-32 Architectures Software Developer's Manual Volume 3B: System Programming Guide],
 http://support.amd.com/us/Processor_TechDocs/24593_APM_v2.pdf[AMD64 Architecture Programmer’s Manual Volume 2: System Programming]
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 0016d1a..0600425 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -126,6 +126,7 @@ PYRF_OBJS =
 SCRIPT_SH =
 
 SCRIPT_SH += perf-archive.sh
+SCRIPT_SH += perf-download.sh
 
 grep-libs = $(filter -l%,$(1))
 strip-libs = $(filter-out -l%,$(1))
@@ -877,6 +878,8 @@ install-bin: all install-gtk
 		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
 	$(call QUIET_INSTALL, perf-archive) \
 		$(INSTALL) $(OUTPUT)perf-archive -t '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
+	$(call QUIET_INSTALL, perf-download) \
+		$(INSTALL) $(OUTPUT)perf-download -t '$(DESTDIR_SQ)$(perfexec_instdir_SQ)'
 ifndef NO_LIBPERL
 	$(call QUIET_INSTALL, perl-scripts) \
 		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$(perfexec_instdir_SQ)/scripts/perl/Perf-Trace-Util/lib/Perf/Trace'; \
@@ -922,7 +925,7 @@ config-clean:
 	@$(MAKE) -C config/feature-checks clean >/dev/null
 
 clean: $(LIBTRACEEVENT)-clean $(LIBAPIKFS)-clean config-clean
-	$(call QUIET_CLEAN, core-objs)  $(RM) $(LIB_OBJS) $(BUILTIN_OBJS) $(LIB_FILE) $(OUTPUT)perf-archive $(OUTPUT)perf.o $(LANG_BINDINGS) $(GTK_OBJS)
+	$(call QUIET_CLEAN, core-objs)  $(RM) $(LIB_OBJS) $(BUILTIN_OBJS) $(LIB_FILE) $(OUTPUT)perf-archive $(OUTPUT)/perf-download $(OUTPUT)perf.o $(LANG_BINDINGS) $(GTK_OBJS)
 	$(call QUIET_CLEAN, core-progs) $(RM) $(ALL_PROGRAMS) perf
 	$(call QUIET_CLEAN, core-gen)   $(RM)  *.spec *.pyc *.pyo */*.pyc */*.pyo $(OUTPUT)common-cmds.h TAGS tags cscope* $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)PERF-CFLAGS $(OUTPUT)PERF-FEATURES $(OUTPUT)util/*-bison* $(OUTPUT)util/*-flex*
 	$(QUIET_SUBDIR0)Documentation $(QUIET_SUBDIR1) clean
diff --git a/tools/perf/perf-download.sh b/tools/perf/perf-download.sh
new file mode 100755
index 0000000..b6e4299
--- /dev/null
+++ b/tools/perf/perf-download.sh
@@ -0,0 +1,57 @@
+#!/bin/bash
+# download event files for current cpu for perf
+
+WGETOPT=${WGETOPT:---no-verbose --timeout 5}
+
+set -e
+
+if ! type wget > /dev/null ; then
+	echo "please install wget"
+	exit 1
+fi
+
+if [ "$1" == "" ] ; then
+	S=$(awk '
+/^vendor/     		{ V=$3 }
+/^model/ && $2 == ":" 	{ M=$3 }
+/^cpu family/ 		{ F = $4 }
+END	      		{ printf("%s-%s-%X", V, F, M) }' /proc/cpuinfo)
+else
+	S="$1"
+fi
+V=$(echo $S  | ( IFS=- read v f m ; echo $v) )
+
+CACHEDIR=${XDG_CACHE_HOME:-~/.cache}
+[ ! -d $CACHEDIR/pmu-events ] && mkdir -p $CACHEDIR/pmu-events
+cd $CACHEDIR/pmu-events
+
+case "$V" in
+GenuineIntel)
+	echo "Downloading models file"
+	URLBASE=${URLBASE:-https://download.01.org/perfmon}
+	MAPFILE=${MAPFILE:-mapfile.csv}
+	echo "Downloading readme.txt"
+	wget -N $WGETOPT $URLBASE/readme.txt
+	;;
+
+# Add more CPU vendors here
+
+*)
+	echo "Unsupported CPU vendor $V"
+	exit 1
+	;;
+esac
+
+wget -N $WGETOPT $URLBASE/$MAPFILE
+
+echo "Downloading events file"
+awk -v urlbase=$URLBASE -v cpu="$S" -F, \
+	'$1 == cpu && $4 == "core" { print urlbase $3; exit 0 }' \
+	$MAPFILE > url$$
+if [ -s url$$ ] ; then
+	wget $WGETOPT -q -i url$$ -O $S-core.json
+else
+	echo "CPU $S not found"
+fi
+rm -f url$$
+
-- 
1.9.3

[PATCH 6/9] perf, tools: Allow events with dot

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

The Intel events use a dot to separate event name and unit mask.
Allow dot in names in the scanner, and remove special handling
of dot as EOF. Also remove the hack in jevents to replace dot
with underscore. This way dotted events can be specified
directly by the user.

I'm not fully sure this change to the scanner is correct
(what was the dot special case good for?), but I haven't
found anything that breaks with it so far at least.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/util/jevents.c      | 9 +--------
 tools/perf/util/parse-events.l | 3 +--
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/jevents.c b/tools/perf/util/jevents.c
index 1fae0b7..43550f7 100644
--- a/tools/perf/util/jevents.c
+++ b/tools/perf/util/jevents.c
@@ -100,15 +100,8 @@ static void addfield(char *map, char **dst, const char *sep,
 
 static void fixname(char *s)
 {
-	for (; *s; s++) {
+	for (; *s; s++)
 		*s = tolower(*s);
-		/*
-		 * Remove '.' for now, until the parser
-		 * can deal with it.
-		 */
-		if (*s == '.')
-			*s = '_';
-	}
 }
 
 static void fixdesc(char *s)
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 3432995..709fa3b 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -81,7 +81,7 @@ num_dec		[0-9]+
 num_hex		0x[a-fA-F0-9]+
 num_raw_hex	[a-fA-F0-9]+
 name		[a-zA-Z_*?][a-zA-Z0-9_*?]*
-name_minus	[a-zA-Z_*?][a-zA-Z0-9\-_*?]*
+name_minus	[a-zA-Z_*?][a-zA-Z0-9\-_*?.]*
 /* If you add a modifier you need to update check_modifier() */
 modifier_event	[ukhpGHSD]+
 modifier_bp	[rwx]{1,3}
@@ -119,7 +119,6 @@ modifier_bp	[rwx]{1,3}
 			return PE_EVENT_NAME;
 		}
 
-.		|
 <<EOF>>		{
 			BEGIN(INITIAL); yyless(0);
 		}
-- 
1.9.3

[PATCH 7/9] perf, tools: Query terminal width and use in perf list

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

Automatically adapt the now wider and word wrapped perf list
output to wider terminals. This requires querying the terminal
before the auto pager takes over, and exporting this
information from the pager subsystem.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/util/cache.h |  1 +
 tools/perf/util/pager.c | 15 +++++++++++++++
 tools/perf/util/pmu.c   | 12 ++----------
 3 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index 7b176dd..07527d6 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -31,6 +31,7 @@ extern void setup_pager(void);
 extern const char *pager_program;
 extern int pager_in_use(void);
 extern int pager_use_color;
+int pager_get_columns(void);
 
 char *alias_lookup(const char *alias);
 int split_cmdline(char *cmdline, const char ***argv);
diff --git a/tools/perf/util/pager.c b/tools/perf/util/pager.c
index 31ee02d..9761202 100644
--- a/tools/perf/util/pager.c
+++ b/tools/perf/util/pager.c
@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "run-command.h"
 #include "sigchain.h"
+#include <sys/ioctl.h>
 
 /*
  * This is split up from the rest of git so that we can do
@@ -8,6 +9,7 @@
  */
 
 static int spawned_pager;
+static int pager_columns;
 
 static void pager_preexec(void)
 {
@@ -47,9 +49,12 @@ static void wait_for_pager_signal(int signo)
 void setup_pager(void)
 {
 	const char *pager = getenv("PERF_PAGER");
+	struct winsize sz;
 
 	if (!isatty(1))
 		return;
+	if (ioctl(1, TIOCGWINSZ, &sz) == 0)
+		pager_columns = sz.ws_col;
 	if (!pager) {
 		if (!pager_program)
 			perf_config(perf_default_config, NULL);
@@ -98,3 +103,13 @@ int pager_in_use(void)
 	env = getenv("PERF_PAGER_IN_USE");
 	return env ? perf_config_bool("PERF_PAGER_IN_USE", env) : 0;
 }
+
+int pager_get_columns(void)
+{
+	char *s;
+
+	s = getenv("COLUMNS");
+	if (s)
+		return atoi(s);
+	return (pager_columns ? pager_columns : 80) - 2;
+}
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index fa21319..8714f9a 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -9,6 +9,7 @@
 #include "pmu.h"
 #include "parse-events.h"
 #include "cpumap.h"
+#include "cache.h"
 #include "jevents.h"
 
 const char *json_file;
@@ -789,15 +790,6 @@ static void wordwrap(char *s, int start, int max, int corr)
 	}
 }
 
-static int get_columns(void)
-{
-	/*
-	 * Should ask the terminal with TIOCGWINSZ here, but we
-	 * need the original fd before the pager.
-	 */
-	return 79;
-}
-
 void print_pmu_events(const char *event_glob, bool name_only)
 {
 	struct perf_pmu *pmu;
@@ -807,7 +799,7 @@ void print_pmu_events(const char *event_glob, bool name_only)
 	int len, j;
 	struct pair *aliases;
 	int numdesc = 0;
-	int columns = get_columns();
+	int columns = pager_get_columns();
 
 	pmu = NULL;
 	len = 0;
-- 
1.9.3

[PATCH 8/9] perf, tools, test: Add test case for alias and JSON parsing v2

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

Add a simple test case to perf test that runs perf download and parses
all the available events, including json events.

This needs adding an all event iterator to pmu.c

v2: Rename identifiers
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/Makefile.perf        |  1 +
 tools/perf/tests/aliases.c      | 58 +++++++++++++++++++++++++++++++++++++++++
 tools/perf/tests/builtin-test.c |  4 +++
 tools/perf/tests/tests.h        |  1 +
 tools/perf/util/pmu.c           | 18 +++++++++++++
 tools/perf/util/pmu.h           |  2 ++
 6 files changed, 84 insertions(+)
 create mode 100644 tools/perf/tests/aliases.c

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 0600425..6adb37f 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -419,6 +419,7 @@ endif
 LIB_OBJS += $(OUTPUT)tests/code-reading.o
 LIB_OBJS += $(OUTPUT)tests/sample-parsing.o
 LIB_OBJS += $(OUTPUT)tests/parse-no-sample-id-all.o
+LIB_OBJS += $(OUTPUT)tests/aliases.o
 ifndef NO_DWARF_UNWIND
 ifeq ($(ARCH),$(filter $(ARCH),x86 arm))
 LIB_OBJS += $(OUTPUT)tests/dwarf-unwind.o
diff --git a/tools/perf/tests/aliases.c b/tools/perf/tests/aliases.c
new file mode 100644
index 0000000..68396e7
--- /dev/null
+++ b/tools/perf/tests/aliases.c
@@ -0,0 +1,58 @@
+/* Check if we can set up all aliases and can read JSON files */
+#include <stdlib.h>
+#include "tests.h"
+#include "pmu.h"
+#include "evlist.h"
+#include "parse-events.h"
+
+static struct perf_evlist *evlist;
+
+static int num_events;
+static int failed;
+
+static int test__event(const char *name)
+{
+	int ret;
+
+	/* Not supported for now */
+	if (!strncmp(name, "energy-", 7))
+		return 0;
+
+	ret = parse_events(evlist, name);
+
+	if (ret) {
+		/*
+		 * We only print on failure because common perf setups
+		 * have events that cannot be parsed.
+		 */
+		fprintf(stderr, "invalid or unsupported event: '%s'\n", name);
+		ret = 0;
+		failed++;
+	} else
+		num_events++;
+	return ret;
+}
+
+int test__aliases(void)
+{
+	int err;
+
+	/* Download JSON files */
+	/* XXX assumes perf is installed */
+	/* For now user must manually download */
+	if (0 && system("perf download > /dev/null") < 0) {
+		/* Don't error out for this for now */
+		fprintf(stderr, "perf download failed\n");
+	}
+
+	evlist = perf_evlist__new();
+	if (evlist == NULL)
+		return -ENOMEM;
+
+	err = pmu_iterate_events(test__event);
+	fprintf(stderr, " Parsed %d events :", num_events);
+	if (failed > 0)
+		pr_debug(" %d events failed", failed);
+	perf_evlist__delete(evlist);
+	return err;
+}
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 6f8b01b..bb37ac2 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -154,6 +154,10 @@ static struct test {
 		.func = test__hists_cumulate,
 	},
 	{
+		.desc = "Test parsing JSON aliases",
+		.func = test__aliases,
+	},
+	{
 		.func = NULL,
 	},
 };
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index ed64790..ab92ad9 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -48,6 +48,7 @@ int test__mmap_thread_lookup(void);
 int test__thread_mg_share(void);
 int test__hists_output(void);
 int test__hists_cumulate(void);
+int test__aliases(void);
 
 #if defined(__x86_64__) || defined(__i386__) || defined(__arm__)
 #ifdef HAVE_DWARF_UNWIND_SUPPORT
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 8714f9a..b87f520 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -869,3 +869,21 @@ bool pmu_have_event(const char *pname, const char *name)
 	}
 	return false;
 }
+
+int pmu_iterate_events(int (*func)(const char *name))
+{
+	int ret = 0;
+	struct perf_pmu *pmu;
+	struct perf_pmu_alias *alias;
+
+	perf_pmu__find("cpu"); /* Load PMUs */
+	pmu = NULL;
+	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+		list_for_each_entry(alias, &pmu->aliases, list) {
+			ret = func(alias->name);
+			if (ret != 0)
+				break;
+		}
+	}
+	return ret;
+}
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 583d21e..a8ed283 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -47,5 +47,7 @@ bool pmu_have_event(const char *pname, const char *name);
 
 int perf_pmu__test(void);
 
+int pmu_iterate_events(int (*func)(const char *name));
+
 extern const char *json_file;
 #endif /* __PMU_H */
-- 
1.9.3

[PATCH 9/9] perf, tools: Add a --quiet flag to perf list

[Andi Kleen]

From: Andi Kleen <ak@linux.intel.com>

Add a --quiet flag to perf list to not print the event descriptions
that were earlier added for JSON events. This may be useful to
get a less crowded listing.

It's still default to print descriptions as that is the more useful
default for most users.  Requested by Namhyung Kim.

Before:

% perf list
...
  baclears.any                                       [Counts the total number when the front end is
                                                      resteered, mainly when the BPU cannot provide a
                                                      correct prediction and this is corrected by other
                                                      branch handling mechanisms at the front end]
  br_inst_exec.all_branches                          [Speculative and retired branches]

After:

% perf list --quiet
...
  baclears.any                                       [Kernel PMU event]
  br_inst_exec.all_branches                          [Kernel PMU event]

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/builtin-list.c      | 14 +++++++++-----
 tools/perf/util/parse-events.c |  4 ++--
 tools/perf/util/parse-events.h |  2 +-
 tools/perf/util/pmu.c          |  4 ++--
 tools/perf/util/pmu.h          |  2 +-
 5 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 086c96f..b064ea4 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -16,16 +16,20 @@
 #include "util/pmu.h"
 #include "util/parse-options.h"
 
+static bool quiet_flag;
+
 int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	int i;
 	const struct option list_options[] = {
 		OPT_STRING(0, "events-file", &json_file, "json file",
 			   "Read event json file"),
+		OPT_BOOLEAN('q', "quiet", &quiet_flag,
+			    "Don't print extra event descriptions"),
 		OPT_END()
 	};
 	const char * const list_usage[] = {
-		"perf list [hw|sw|cache|tracepoint|pmu|event_glob]",
+		"perf list [--events-file FILE] [--quiet] [hw|sw|cache|tracepoint|pmu|event_glob]",
 		NULL
 	};
 
@@ -35,7 +39,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 	setup_pager();
 
 	if (argc == 0) {
-		print_events(NULL, false);
+		print_events(NULL, false, quiet_flag);
 		return 0;
 	}
 
@@ -54,15 +58,15 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 			 strcmp(argv[i], "hwcache") == 0)
 			print_hwcache_events(NULL, false);
 		else if (strcmp(argv[i], "pmu") == 0)
-			print_pmu_events(NULL, false);
+			print_pmu_events(NULL, false, quiet_flag);
 		else if (strcmp(argv[i], "--raw-dump") == 0)
-			print_events(NULL, true);
+			print_events(NULL, true, quiet_flag);
 		else {
 			char *sep = strchr(argv[i], ':'), *s;
 			int sep_idx;
 
 			if (sep == NULL) {
-				print_events(argv[i], false);
+				print_events(argv[i], false, quiet_flag);
 				continue;
 			}
 			sep_idx = sep - argv[i];
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 1e15df1..e2badf3 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1231,7 +1231,7 @@ static void print_symbol_events(const char *event_glob, unsigned type,
 /*
  * Print the help text for the event symbols:
  */
-void print_events(const char *event_glob, bool name_only)
+void print_events(const char *event_glob, bool name_only, bool quiet)
 {
 	if (!name_only) {
 		printf("\n");
@@ -1246,7 +1246,7 @@ void print_events(const char *event_glob, bool name_only)
 
 	print_hwcache_events(event_glob, name_only);
 
-	print_pmu_events(event_glob, name_only);
+	print_pmu_events(event_glob, name_only, quiet);
 
 	if (event_glob != NULL)
 		return;
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index df094b4..f3ef0dc 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -100,7 +100,7 @@ void parse_events_update_lists(struct list_head *list_event,
 			       struct list_head *list_all);
 void parse_events_error(void *data, void *scanner, char const *msg);
 
-void print_events(const char *event_glob, bool name_only);
+void print_events(const char *event_glob, bool name_only, bool quiet);
 void print_events_type(u8 type);
 void print_tracepoint_events(const char *subsys_glob, const char *event_glob,
 			     bool name_only);
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index b87f520..ccdd714 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -790,7 +790,7 @@ static void wordwrap(char *s, int start, int max, int corr)
 	}
 }
 
-void print_pmu_events(const char *event_glob, bool name_only)
+void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag)
 {
 	struct perf_pmu *pmu;
 	struct perf_pmu_alias *alias;
@@ -838,7 +838,7 @@ void print_pmu_events(const char *event_glob, bool name_only)
 			printf("%s ", aliases[j].name);
 			continue;
 		}
-		if (aliases[j].desc) {
+		if (aliases[j].desc && !quiet_flag) {
 			if (numdesc++ == 0 && printed)
 				printf("\n");
 			printf("  %-50s [", aliases[j].name);
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index a8ed283..461d13a 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -42,7 +42,7 @@ int perf_pmu__format_parse(char *dir, struct list_head *head);
 
 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu);
 
-void print_pmu_events(const char *event_glob, bool name_only);
+void print_pmu_events(const char *event_glob, bool name_only, bool quiet);
 bool pmu_have_event(const char *pname, const char *name);
 
 int perf_pmu__test(void);
-- 
1.9.3

Re: perf: Add support for full Intel event lists v6

[Hagen Paul Pfeifer]

Probably too late, but IMHO the subcommand "download" is unhappy
named. What is "downloaded"? traces? Python helper libs for
perf-python support, I don't know it. What about "events-download",
"events-database", ...

I also thought about further sub-command to delete the cache, update
the cache, limit pull to specific vendors, ... I know this is the
first shot and further subcommands can be added. But we will end up in
something like
E.g.:

perf events-download pull
perf events-download pull --vendor amd
perf events-download update
perf events-download purge

Hagen

Re: perf: Add support for full Intel event lists v6

[Andi Kleen]

On Sat, Jun 14, 2014 at 10:49:35PM +0200, Hagen Paul Pfeifer wrote:
> Probably too late, but IMHO the subcommand "download" is unhappy
> named. What is "downloaded"? traces? Python helper libs for
> perf-python support, I don't know it. What about "events-download",
> "events-database", ...

I prefer just download.

> 
> I also thought about further sub-command to delete the cache, update
> the cache, limit pull to specific vendors, ... I know this is the
> first shot and further subcommands can be added. But we will end up in
> something like

The sub commands don't make a lot of sense, as the event list is only 
useful for the current system.

-Andi

Re: perf: Add support for full Intel event lists v6

[Namhyung Kim]

Hi Hagen,

2014-06-14 (토), 22:49 +0200, Hagen Paul Pfeifer:
> Probably too late, but IMHO the subcommand "download" is unhappy
> named. What is "downloaded"? traces? Python helper libs for
> perf-python support, I don't know it. What about "events-download",
> "events-database", ...

Hmm.. maybe we can add support something like above later - "perf
download event" or "perf download blabla".

But I have a different idea - leaving perf download as a plumbing tool,
and add --download option into the perf list to call it internally.
Maybe it can automatically download event file if it didn't find the
file in the local cache.


> 
> I also thought about further sub-command to delete the cache, update
> the cache, limit pull to specific vendors, ... I know this is the
> first shot and further subcommands can be added. But we will end up in
> something like
> E.g.:
> 
> perf events-download pull
> perf events-download pull --vendor amd
> perf events-download update
> perf events-download purge

Looks like 'event-cache' is a more appropriate name IMHO.

Anyway, thank you for the thought and suggestion. :)

Thanks,
Namhyung

Re: [PATCH 9/9] perf, tools: Add a --quiet flag to perf list

[Namhyung Kim]

Hi Andi,

2014-06-13 (금), 16:03 -0700, Andi Kleen:
> From: Andi Kleen <ak@linux.intel.com>
> 
> Add a --quiet flag to perf list to not print the event descriptions
> that were earlier added for JSON events. This may be useful to
> get a less crowded listing.
> 
> It's still default to print descriptions as that is the more useful
> default for most users.  Requested by Namhyung Kim.

Did I request the --quiet thing?  It seems like there's a
miscommunication.. :-/

I still prefer -v option and not printing descriptions by default - but
want to inform users to use -v option.  However I also want to hear from
others on this.

Btw, it'd better if it can support event glob on the pmu events (or
simply all events) too as this will increase the number of events
significantly.  But this can be a further work.

Thanks,
Namhyung


> 
> Before:
> 
> % perf list
> ...
>   baclears.any                                       [Counts the total number when the front end is
>                                                       resteered, mainly when the BPU cannot provide a
>                                                       correct prediction and this is corrected by other
>                                                       branch handling mechanisms at the front end]
>   br_inst_exec.all_branches                          [Speculative and retired branches]
> 
> After:
> 
> % perf list --quiet
> ...
>   baclears.any                                       [Kernel PMU event]
>   br_inst_exec.all_branches                          [Kernel PMU event]

Re: perf: Add support for full Intel event lists v6

[Andi Kleen]

On Sun, Jun 15, 2014 at 10:03:09PM +0900, Namhyung Kim wrote:
> Hi Hagen,
> 
> 2014-06-14 (토), 22:49 +0200, Hagen Paul Pfeifer:
> > Probably too late, but IMHO the subcommand "download" is unhappy
> > named. What is "downloaded"? traces? Python helper libs for
> > perf-python support, I don't know it. What about "events-download",
> > "events-database", ...
> 
> Hmm.. maybe we can add support something like above later - "perf
> download event" or "perf download blabla"

Sorry I think that's all overdesigning. Designing for unknown
possibilities is usually a bad idea.

In the unlikely case that something else was ever downloaded a new command
can be added.

> But I have a different idea - leaving perf download as a plumbing tool,
> and add --download option into the perf list to call it internally.

That would be syntactical vinegar.

> Maybe it can automatically download event file if it didn't find the
> file in the local cache.

That wasn't done intentionally, so that people who don't want
network accesses don't get them.

-Andi

Re: [PATCH 9/9] perf, tools: Add a --quiet flag to perf list

[Andi Kleen]

On Sun, Jun 15, 2014 at 10:17:41PM +0900, Namhyung Kim wrote:
> > It's still default to print descriptions as that is the more useful
> > default for most users.  Requested by Namhyung Kim.
> 
> Did I request the --quiet thing?  It seems like there's a
> miscommunication.. :-/

Well it was done based on your feedback, and gets the closest
to your original request as possible.

> Btw, it'd better if it can support event glob on the pmu events (or
> simply all events) too as this will increase the number of events
> significantly.  But this can be a further work.

That already works.

% perf list icache*
List of pre-defined events (to be used in -e):
  icache.ifetch_stall                                [Cycles where a code-fetch
                                                      stalled due to L1
                                                      instruction-cache miss
                                                      or an iTLB miss]
  icache.misses                                      [Number of Instruction
                                                      Cache, Streaming Buffer
                                                      and Victim Cache
                                                      Misses. Includes
                                                      Uncacheable accesses]
%

-Andi

Re: perf: Add support for full Intel event lists v6

[Hagen Paul Pfeifer]

Hey Andi, Namhyung,

intention was just to raise hands, later there is probably no
possibility to change the command name without breaking scripts.
Anyway, the whole mechanism is awesome! ;-)

Hagen

Re: [PATCH 9/9] perf, tools: Add a --quiet flag to perf list

[Namhyung Kim]

Hi Andi,

On Sun, 15 Jun 2014 18:11:38 +0200, Andi Kleen wrote:
> On Sun, Jun 15, 2014 at 10:17:41PM +0900, Namhyung Kim wrote:
>> > It's still default to print descriptions as that is the more useful
>> > default for most users.  Requested by Namhyung Kim.
>> 
>> Did I request the --quiet thing?  It seems like there's a
>> miscommunication.. :-/
>
> Well it was done based on your feedback, and gets the closest
> to your original request as possible.
>
>> Btw, it'd better if it can support event glob on the pmu events (or
>> simply all events) too as this will increase the number of events
>> significantly.  But this can be a further work.
>
> That already works.

Oh, didn't notice that.  Nice work! :)

Thanks,
Namhyung


>
> % perf list icache*
> List of pre-defined events (to be used in -e):
>   icache.ifetch_stall                                [Cycles where a code-fetch
>                                                       stalled due to L1
>                                                       instruction-cache miss
>                                                       or an iTLB miss]
>   icache.misses                                      [Number of Instruction
>                                                       Cache, Streaming Buffer
>                                                       and Victim Cache
>                                                       Misses. Includes
>                                                       Uncacheable accesses]
> %
>
> -Andi

Re: [PATCH 4/9] perf, tools: Automatically look for event file name for cpu v3

[Sukadev Bhattiprolu]

Andi Kleen [andi@firstfloor.org] wrote:

| +static const char *json_default_name(void)
| +{
| +	char *cache;
| +	char *idstr = get_cpu_str();
| +	char *res = NULL;
| +	char *home = NULL;
| +	char *emap;
| +
| +	emap = getenv("EVENTMAP");
| +	if (emap) {
| +		if (access(emap, R_OK) == 0)
| +			return emap;
| +		if (asprintf(&idstr, "%s-core", emap) < 0)
| +			return NULL;
| +	}

Hi Andi,

Couple of questions/comments about EVENTMAP and the "core" suffix.

Is EVENTMAP a new environment variable ? If specific to PERF, should
we prefix it with "PERF_" to avoid collision?

Would all/many architectures need this "-core" suffix or is that Intel
specific ?

Is the intent that architectures that don't need this should simply
never set EVENTMAP variable ?

| +
| +	cache = getenv("XDG_CACHE_HOME");
| +	if (!cache) {
| +		home = getenv("HOME");
| +		if (!home || asprintf(&cache, "%s/.cache", home) < 0)
| +			goto out;
| +	}

As with XDG_CACHE_HOME in perf-download.txt, can you please add a note
about usage of EVENTMAP in the man page.

| +	if (cache && idstr)
| +		res = mkpath("%s/pmu-events/%s.json",
| +			     cache,
| +			     idstr);
| +	if (home)
| +		free(cache);
| +out:
| +	free(idstr);
| +	return res;
| +}
| +

Re: [PATCH 4/9] perf, tools: Automatically look for event file name for cpu v3

[Andi Kleen]

> Is EVENTMAP a new environment variable ? If specific to PERF, should
> we prefix it with "PERF_" to avoid collision?

It's not perf specific, but shared with other tools (e.g. pmu-tools)
> 
> Would all/many architectures need this "-core" suffix or is that Intel
> specific ?

You don't need it, just specify a full name.

> Is the intent that architectures that don't need this should simply
> never set EVENTMAP variable ?

Any architecture can use EVENTMAP, it just points to a json file.

-Andi

Re: [PATCH 9/9] perf, tools: Add a --quiet flag to perf list

[Jiri Olsa]

On Sun, Jun 15, 2014 at 10:17:41PM +0900, Namhyung Kim wrote:
> Hi Andi,
> 
> 2014-06-13 (금), 16:03 -0700, Andi Kleen:
> > From: Andi Kleen <ak@linux.intel.com>
> > 
> > Add a --quiet flag to perf list to not print the event descriptions
> > that were earlier added for JSON events. This may be useful to
> > get a less crowded listing.
> > 
> > It's still default to print descriptions as that is the more useful
> > default for most users.  Requested by Namhyung Kim.
> 
> Did I request the --quiet thing?  It seems like there's a
> miscommunication.. :-/
> 
> I still prefer -v option and not printing descriptions by default - but
> want to inform users to use -v option.  However I also want to hear from
> others on this.

I dont mind descriptions by default, but 'quiet' seems more generic
than what it does now ... how about '--no-desc'

jirka