Add proftool to decode profile data

This tool provides the facility to decode U-Boot trace data and write out
a text file in Linux ftrace format for use with pytimechart.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 611 insertions, 0 deletions

diff --git a/tools/proftool.c b/tools/proftool.c
new file mode 100644
index 0000000000..a48ed286a5
--- /dev/null
+++ b/tools/proftool.c
@@ -0,0 +1,611 @@
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* Decode and dump U-Boot profiling information */
+
+#include <assert.h>
+#include <ctype.h>
+#include <limits.h>
+#include <regex.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/param.h>
+
+#include <compiler.h>
+#include <trace.h>
+
+#define MAX_LINE_LEN 500
+
+enum {
+	FUNCF_TRACE	= 1 << 0,	/* Include this function in trace */
+};
+
+struct func_info {
+	unsigned long offset;
+	const char *name;
+	unsigned long code_size;
+	unsigned long call_count;
+	unsigned flags;
+	/* the section this function is in */
+	struct objsection_info *objsection;
+};
+
+enum trace_line_type {
+	TRACE_LINE_INCLUDE,
+	TRACE_LINE_EXCLUDE,
+};
+
+struct trace_configline_info {
+	struct trace_configline_info *next;
+	enum trace_line_type type;
+	const char *name;	/* identifier name / wildcard */
+	regex_t regex;		/* Regex to use if name starts with / */
+};
+
+/* The contents of the trace config file */
+struct trace_configline_info *trace_config_head;
+
+struct func_info *func_list;
+int func_count;
+struct trace_call *call_list;
+int call_count;
+int verbose;	/* Verbosity level 0=none, 1=warn, 2=notice, 3=info, 4=debug */
+unsigned long text_offset;		/* text address of first function */
+
+static void outf(int level, const char *fmt, ...)
+		__attribute__ ((format (__printf__, 2, 3)));
+#define error(fmt, b...) outf(0, fmt, ##b)
+#define warn(fmt, b...) outf(1, fmt, ##b)
+#define notice(fmt, b...) outf(2, fmt, ##b)
+#define info(fmt, b...) outf(3, fmt, ##b)
+#define debug(fmt, b...) outf(4, fmt, ##b)
+
+
+static void outf(int level, const char *fmt, ...)
+{
+	if (verbose >= level) {
+		va_list args;
+
+		va_start(args, fmt);
+		vfprintf(stderr, fmt, args);
+		va_end(args);
+	}
+}
+
+static void usage(void)
+{
+	fprintf(stderr,
+		"Usage: proftool -cds -v3 <cmd> <profdata>\n"
+		"\n"
+		"Commands\n"
+		"   dump-ftrace\t\tDump out textual data in ftrace format\n"
+		"\n"
+		"Options:\n"
+		"   -m <map>\tSpecify Systen.map file\n"
+		"   -t <trace>\tSpecific trace data file (from U-Boot)\n"
+		"   -v <0-4>\tSpecify verbosity\n");
+	exit(EXIT_FAILURE);
+}
+
+static int h_cmp_offset(const void *v1, const void *v2)
+{
+	const struct func_info *f1 = v1, *f2 = v2;
+
+	return (f1->offset / FUNC_SITE_SIZE) - (f2->offset / FUNC_SITE_SIZE);
+}
+
+static int read_system_map(FILE *fin)
+{
+	unsigned long offset, start = 0;
+	struct func_info *func;
+	char buff[MAX_LINE_LEN];
+	char symtype;
+	char symname[MAX_LINE_LEN + 1];
+	int linenum;
+	int alloced;
+
+	for (linenum = 1, alloced = func_count = 0;; linenum++) {
+		int fields = 0;
+
+		if (fgets(buff, sizeof(buff), fin))
+			fields = sscanf(buff, "%lx %c %100s\n", &offset,
+				&symtype, symname);
+		if (fields == 2) {
+			continue;
+		} else if (feof(fin)) {
+			break;
+		} else if (fields < 2) {
+			error("Map file line %d: invalid format\n", linenum);
+			return 1;
+		}
+
+		/* Must be a text symbol */
+		symtype = tolower(symtype);
+		if (symtype != 't' && symtype != 'w')
+			continue;
+
+		if (func_count == alloced) {
+			alloced += 256;
+			func_list = realloc(func_list,
+					sizeof(struct func_info) * alloced);
+			assert(func_list);
+		}
+		if (!func_count)
+			start = offset;
+
+		func = &func_list[func_count++];
+		memset(func, '\0', sizeof(*func));
+		func->offset = offset - start;
+		func->name = strdup(symname);
+		func->flags = FUNCF_TRACE;	/* trace by default */
+
+		/* Update previous function's code size */
+		if (func_count > 1)
+			func[-1].code_size = func->offset - func[-1].offset;
+	}
+	notice("%d functions found in map file\n", func_count);
+	text_offset = start;
+	return 0;
+}
+
+static int read_data(FILE *fin, void *buff, int size)
+{
+	int err;
+
+	err = fread(buff, 1, size, fin);
+	if (!err)
+		return 1;
+	if (err != size) {
+		error("Cannot read profile file at pos %ld\n", ftell(fin));
+		return -1;
+	}
+	return 0;
+}
+
+static struct func_info *find_func_by_offset(uint32_t offset)
+{
+	struct func_info key, *found;
+
+	key.offset = offset;
+	found = bsearch(&key, func_list, func_count, sizeof(struct func_info),
+			h_cmp_offset);
+
+	return found;
+}
+
+/* This finds the function which contains the given offset */
+static struct func_info *find_caller_by_offset(uint32_t offset)
+{
+	int low;	/* least function that could be a match */
+	int high;	/* greated function that could be a match */
+	struct func_info key;
+
+	low = 0;
+	high = func_count - 1;
+	key.offset = offset;
+	while (high > low + 1) {
+		int mid = (low + high) / 2;
+		int result;
+
+		result = h_cmp_offset(&key, &func_list[mid]);
+		if (result > 0)
+			low = mid;
+		else if (result < 0)
+			high = mid;
+		else
+			return &func_list[mid];
+	}
+
+	return low >= 0 ? &func_list[low] : NULL;
+}
+
+static int read_calls(FILE *fin, int count)
+{
+	struct trace_call *call_data;
+	int i;
+
+	notice("call count: %d\n", count);
+	call_list = (struct trace_call *)calloc(count, sizeof(*call_data));
+	if (!call_list) {
+		error("Cannot allocate call_list\n");
+		return -1;
+	}
+	call_count = count;
+
+	call_data = call_list;
+	for (i = 0; i < count; i++, call_data++) {
+		if (read_data(fin, call_data, sizeof(*call_data)))
+			return 1;
+	}
+	return 0;
+}
+
+static int read_profile(FILE *fin, int *not_found)
+{
+	struct trace_output_hdr hdr;
+
+	*not_found = 0;
+	while (!feof(fin)) {
+		int err;
+
+		err = read_data(fin, &hdr, sizeof(hdr));
+		if (err == 1)
+			break; /* EOF */
+		else if (err)
+			return 1;
+
+		switch (hdr.type) {
+		case TRACE_CHUNK_FUNCS:
+			/* Ignored at present */
+			break;
+
+		case TRACE_CHUNK_CALLS:
+			if (read_calls(fin, hdr.rec_count))
+				return 1;
+			break;
+		}
+	}
+	return 0;
+}
+
+static int read_map_file(const char *fname)
+{
+	FILE *fmap;
+	int err = 0;
+
+	fmap = fopen(fname, "r");
+	if (!fmap) {
+		error("Cannot open map file '%s'\n", fname);
+		return 1;
+	}
+	if (fmap) {
+		err = read_system_map(fmap);
+		fclose(fmap);
+	}
+	return err;
+}
+
+static int read_profile_file(const char *fname)
+{
+	int not_found = INT_MAX;
+	FILE *fprof;
+	int err;
+
+	fprof = fopen(fname, "rb");
+	if (!fprof) {
+		error("Cannot open profile data file '%s'\n",
+		      fname);
+		return 1;
+	} else {
+		err = read_profile(fprof, &not_found);
+		fclose(fprof);
+		if (err)
+			return err;
+
+		if (not_found) {
+			warn("%d profile functions could not be found in the map file - are you sure that your profile data and map file correspond?\n",
+			     not_found);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static int regex_report_error(regex_t *regex, int err, const char *op,
+			      const char *name)
+{
+	char buf[200];
+
+	regerror(err, regex, buf, sizeof(buf));
+	error("Regex error '%s' in %s '%s'\n", buf, op, name);
+	return -1;
+}
+
+static void check_trace_config_line(struct trace_configline_info *item)
+{
+	struct func_info *func, *end;
+	int err;
+
+	debug("Checking trace config line '%s'\n", item->name);
+	for (func = func_list, end = func + func_count; func < end; func++) {
+		err = regexec(&item->regex, func->name, 0, NULL, 0);
+		debug("   - regex '%s', string '%s': %d\n", item->name,
+		      func->name, err);
+		if (err == REG_NOMATCH)
+			continue;
+
+		if (err != REG_NOERROR) {
+			regex_report_error(&item->regex, err, "match",
+					   item->name);
+			break;
+		}
+
+		/* It matches, so perform the action */
+		switch (item->type) {
+		case TRACE_LINE_INCLUDE:
+			info("      include %s at %lx\n", func->name,
+			     text_offset + func->offset);
+			func->flags |= FUNCF_TRACE;
+			break;
+
+		case TRACE_LINE_EXCLUDE:
+			info("      exclude %s at %lx\n", func->name,
+			     text_offset + func->offset);
+			func->flags &= ~FUNCF_TRACE;
+			break;
+		}
+	}
+}
+
+static void check_trace_config(void)
+{
+	struct trace_configline_info *line;
+
+	for (line = trace_config_head; line; line = line->next)
+		check_trace_config_line(line);
+}
+
+/**
+ * Check the functions to see if they each have an objsection. If not, then
+ * the linker must have eliminated them.
+ */
+static void check_functions(void)
+{
+	struct func_info *func, *end;
+	unsigned long removed_code_size = 0;
+	int not_found = 0;
+
+	/* Look for missing functions */
+	for (func = func_list, end = func + func_count; func < end; func++) {
+		if (!func->objsection) {
+			removed_code_size += func->code_size;
+			not_found++;
+		}
+	}
+
+	/* Figure out what functions we want to trace */
+	check_trace_config();
+
+	warn("%d functions removed by linker, %ld code size\n",
+	     not_found, removed_code_size);
+}
+
+static int read_trace_config(FILE *fin)
+{
+	char buff[200];
+	int linenum = 0;
+	struct trace_configline_info **tailp = &trace_config_head;
+
+	while (fgets(buff, sizeof(buff), fin)) {
+		int len = strlen(buff);
+		struct trace_configline_info *line;
+		char *saveptr;
+		char *s, *tok;
+		int err;
+
+		linenum++;
+		if (len && buff[len - 1] == '\n')
+			buff[len - 1] = '\0';
+
+		/* skip blank lines and comments */
+		for (s = buff; *s == ' ' || *s == '\t'; s++)
+			;
+		if (!*s || *s == '#')
+			continue;
+
+		line = (struct trace_configline_info *)calloc(1,
+							      sizeof(*line));
+		if (!line) {
+			error("Cannot allocate config line\n");
+			return -1;
+		}
+
+		tok = strtok_r(s, " \t", &saveptr);
+		if (!tok) {
+			error("Invalid trace config data on line %d\n",
+			      linenum);
+			return -1;
+		}
+		if (0 == strcmp(tok, "include-func")) {
+			line->type = TRACE_LINE_INCLUDE;
+		} else if (0 == strcmp(tok, "exclude-func")) {
+			line->type = TRACE_LINE_EXCLUDE;
+		} else {
+			error("Unknown command in trace config data line %d\n",
+			      linenum);
+			return -1;
+		}
+
+		tok = strtok_r(NULL, " \t", &saveptr);
+		if (!tok) {
+			error("Missing pattern in trace config data line %d\n",
+			      linenum);
+			return -1;
+		}
+
+		err = regcomp(&line->regex, tok, REG_NOSUB);
+		if (err) {
+			free(line);
+			return regex_report_error(&line->regex, err, "compile",
+						  tok);
+		}
+
+		/* link this new one to the end of the list */
+		line->name = strdup(tok);
+		line->next = NULL;
+		*tailp = line;
+		tailp = &line->next;
+	}
+
+	if (!feof(fin)) {
+		error("Cannot read from trace config file at position %ld\n",
+		      ftell(fin));
+		return -1;
+	}
+	return 0;
+}
+
+static int read_trace_config_file(const char *fname)
+{
+	FILE *fin;
+	int err;
+
+	fin = fopen(fname, "r");
+	if (!fin) {
+		error("Cannot open trace_config file '%s'\n", fname);
+		return -1;
+	}
+	err = read_trace_config(fin);
+	fclose(fin);
+	return err;
+}
+
+static void out_func(ulong func_offset, int is_caller, const char *suffix)
+{
+	struct func_info *func;
+
+	func = (is_caller ? find_caller_by_offset : find_func_by_offset)
+		(func_offset);
+
+	if (func)
+		printf("%s%s", func->name, suffix);
+	else
+		printf("%lx%s", func_offset, suffix);
+}
+
+/*
+ * # tracer: function
+ * #
+ * #           TASK-PID   CPU#    TIMESTAMP  FUNCTION
+ * #              | |      |          |         |
+ * #           bash-4251  [01] 10152.583854: path_put <-path_walk
+ * #           bash-4251  [01] 10152.583855: dput <-path_put
+ * #           bash-4251  [01] 10152.583855: _atomic_dec_and_lock <-dput
+ */
+static int make_ftrace(void)
+{
+	struct trace_call *call;
+	int missing_count = 0, skip_count = 0;
+	int i;
+
+	printf("# tracer: ftrace\n"
+		"#\n"
+		"#           TASK-PID   CPU#    TIMESTAMP  FUNCTION\n"
+		"#              | |      |          |         |\n");
+	for (i = 0, call = call_list; i < call_count; i++, call++) {
+		struct func_info *func = find_func_by_offset(call->func);
+		ulong time = call->flags & FUNCF_TIMESTAMP_MASK;
+
+		if (TRACE_CALL_TYPE(call) != FUNCF_ENTRY &&
+		    TRACE_CALL_TYPE(call) != FUNCF_EXIT)
+			continue;
+		if (!func) {
+			warn("Cannot find function at %lx\n",
+			     text_offset + call->func);
+			missing_count++;
+			continue;
+		}
+
+		if (!(func->flags & FUNCF_TRACE)) {
+			debug("Funcion '%s' is excluded from trace\n",
+			      func->name);
+			skip_count++;
+			continue;
+		}
+
+		printf("%16s-%-5d [01] %lu.%06lu: ", "uboot", 1,
+		       time / 1000000, time % 1000000);
+
+		out_func(call->func, 0, " <- ");
+		out_func(call->caller, 1, "\n");
+	}
+	info("ftrace: %d functions not found, %d excluded\n", missing_count,
+	     skip_count);
+
+	return 0;
+}
+
+static int prof_tool(int argc, char * const argv[],
+		     const char *prof_fname, const char *map_fname,
+		     const char *trace_config_fname)
+{
+	int err = 0;
+
+	if (read_map_file(map_fname))
+		return -1;
+	if (prof_fname && read_profile_file(prof_fname))
+		return -1;
+	if (trace_config_fname && read_trace_config_file(trace_config_fname))
+		return -1;
+
+	check_functions();
+
+	for (; argc; argc--, argv++) {
+		const char *cmd = *argv;
+
+		if (0 == strcmp(cmd, "dump-ftrace"))
+			err = make_ftrace();
+		else
+			warn("Unknown command '%s'\n", cmd);
+	}
+
+	return err;
+}
+
+int main(int argc, char *argv[])
+{
+	const char *map_fname = "System.map";
+	const char *prof_fname = NULL;
+	const char *trace_config_fname = NULL;
+	int opt;
+
+	verbose = 2;
+	while ((opt = getopt(argc, argv, "m:p:t:v:")) != -1) {
+		switch (opt) {
+		case 'm':
+			map_fname = optarg;
+			break;
+
+		case 'p':
+			prof_fname = optarg;
+			break;
+
+		case 't':
+			trace_config_fname = optarg;
+			break;
+
+		case 'v':
+			verbose = atoi(optarg);
+			break;
+
+		default:
+			usage();
+		}
+	}
+	argc -= optind; argv += optind;
+	if (argc < 1)
+		usage();
+
+	debug("Debug enabled\n");
+	return prof_tool(argc, argv, prof_fname, map_fname,
+			 trace_config_fname);
+}