[PATCH 15/24] trace: Rename prof to trace and improve comments
Simon Glass
sjg at chromium.org
Sun Jan 15 22:15:52 CET 2023
The current use of 'profile' in some places is confusing. Update the code
to use the word 'trace' consistently. Change the flags to better match
their meaning and add some more comments.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
tools/proftool.c | 196 +++++++++++++++++++++++++++++++++++++----------
1 file changed, 157 insertions(+), 39 deletions(-)
diff --git a/tools/proftool.c b/tools/proftool.c
index b66ea556486..6aa157c8b59 100644
--- a/tools/proftool.c
+++ b/tools/proftool.c
@@ -26,38 +26,62 @@ enum {
FUNCF_TRACE = 1 << 0, /* Include this function in trace */
};
+/**
+ * struct func_info - information recorded for each function
+ *
+ * @offset: Function offset in the image, measured from the text_base
+ * @name: Function name
+ * @code_size: Total code size of the function
+ * @flags: Either 0 or FUNCF_TRACE
+ * @objsection: the section this function is in
+ */
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 - whether to include or exclude a function
+ *
+ * @TRACE_LINE_INCLUDE: Include the function
+ * @TRACE_LINE_EXCLUDE: Exclude the function
+ */
enum trace_line_type {
TRACE_LINE_INCLUDE,
TRACE_LINE_EXCLUDE,
};
+/**
+ * struct trace_configline_info - information about a config-file line
+ *
+ * @next: Next line
+ * @type: Line type
+ * @name: identifier name / wildcard
+ * @regex: Regex to use if name starts with '/'
+ */
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 / */
+ const char *name;
+ regex_t regex;
};
/* The contents of the trace config file */
struct trace_configline_info *trace_config_head;
+/* list of all functions in System.map file, sorted by offset in the image */
struct func_info *func_list;
-int func_count;
-struct trace_call *call_list;
-int call_count;
+
+int func_count; /* number of functions */
+struct trace_call *call_list; /* list of all calls in the input trace file */
+int call_count; /* number of calls */
int verbose; /* Verbosity level 0=none, 1=warn, 2=notice, 3=info, 4=debug */
-unsigned long text_offset; /* text address of first function */
+ulong text_offset; /* text address of first function */
+/* debugging helpers */
static void outf(int level, const char *fmt, ...)
__attribute__ ((format (__printf__, 2, 3)));
#define error(fmt, b...) outf(0, fmt, ##b)
@@ -66,7 +90,6 @@ static void outf(int level, const char *fmt, ...)
#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) {
@@ -84,16 +107,24 @@ static void usage(void)
"Usage: proftool [-cmtv] <cmd> <profdata>\n"
"\n"
"Commands\n"
- " dump-ftrace\t\tDump out textual data in ftrace format\n"
+ " dump-ftrace\t\tDump out records in ftrace format for use by trace-cmd\n"
"\n"
"Options:\n"
- " -c <cfg>\tSpecific config file\n"
+ " -c <cfg>\tSpecify config file\n"
" -m <map>\tSpecify Systen.map file\n"
+ " -o <fname>\tSpecify output file\n"
" -t <fname>\tSpecify trace data file (from U-Boot 'trace calls')\n"
" -v <0-4>\tSpecify verbosity\n");
exit(EXIT_FAILURE);
}
+/**
+ * h_cmp_offset - bsearch() function to compare two functions bny their offset
+ *
+ * @v1: Pointer to first function (struct func_info)
+ * @v2: Pointer to second function (struct func_info)
+ * Returns: < 0 if v1 offset < v2 offset, 0 if equal, > 0 otherwise
+ */
static int h_cmp_offset(const void *v1, const void *v2)
{
const struct func_info *f1 = v1, *f2 = v2;
@@ -101,6 +132,15 @@ static int h_cmp_offset(const void *v1, const void *v2)
return (f1->offset / FUNC_SITE_SIZE) - (f2->offset / FUNC_SITE_SIZE);
}
+/**
+ * read_system_map() - read the System.map file to create a list of functions
+ *
+ * This also reads the text_offset value, since we assume that the first text
+ * symbol is at that address
+ *
+ * @fin: File to read
+ * Returns: 0 if OK, non-zero on error
+ */
static int read_system_map(FILE *fin)
{
unsigned long offset, start = 0;
@@ -152,6 +192,7 @@ static int read_system_map(FILE *fin)
}
notice("%d functions found in map file\n", func_count);
text_offset = start;
+
return 0;
}
@@ -163,13 +204,22 @@ static int read_data(FILE *fin, void *buff, int size)
if (!err)
return 1;
if (err != size) {
- error("Cannot read profile file at pos %lx\n", ftell(fin));
+ error("Cannot read trace file at pos %lx\n", ftell(fin));
return -1;
}
return 0;
}
-static struct func_info *find_func_by_offset(uint32_t offset)
+/**
+ * find_func_by_offset() - Look up a function by its offset
+ *
+ * @offset: Offset to search for, from text_base
+ * Returns: function, if found, else NULL
+ *
+ * This does a fast search for a function given its offset from text_base
+ *
+ */
+static struct func_info *find_func_by_offset(uint offset)
{
struct func_info key, *found;
@@ -180,8 +230,17 @@ static struct func_info *find_func_by_offset(uint32_t offset)
return found;
}
-/* This finds the function which contains the given offset */
-static struct func_info *find_caller_by_offset(uint32_t offset)
+/**
+ * find_caller_by_offset() - finds the function which contains the given offset
+ *
+ * @offset: Offset to search for, from text_base
+ * Returns: function, if found, else NULL
+ *
+ * If the offset falls between two functions, then it is assumed to belong to
+ * the first function (with the lowest offset). This is a way of figuring out
+ * which function owns code at a particular offset
+ */
+static struct func_info *find_caller_by_offset(uint offset)
{
int low; /* least function that could be a match */
int high; /* greated function that could be a match */
@@ -206,6 +265,15 @@ static struct func_info *find_caller_by_offset(uint32_t offset)
return low >= 0 ? &func_list[low] : NULL;
}
+/**
+ * read_calls() - Read the list of calls from the trace data
+ *
+ * The calls are stored consecutively in the trace output produced by U-Boot
+ *
+ * @fin: File to read from
+ * @count: Number of calls to read
+ * Returns: 0 if OK, -1 on error
+ */
static int read_calls(FILE *fin, size_t count)
{
struct trace_call *call_data;
@@ -222,16 +290,24 @@ static int read_calls(FILE *fin, size_t 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 -1;
}
return 0;
}
-static int read_profile(FILE *fin, int *not_found)
+/**
+ * read_trace() - Read the U-Boot trace file
+ *
+ * Read in the calls from the trace file. The function list is ignored at
+ * present
+ *
+ * @fin: File to read
+ * Returns 0 if OK, non-zero on error
+ */
+static int read_trace(FILE *fin)
{
struct trace_output_hdr hdr;
- *not_found = 0;
while (!feof(fin)) {
int err;
@@ -255,6 +331,14 @@ static int read_profile(FILE *fin, int *not_found)
return 0;
}
+/**
+ * read_map_file() - Read the System.map file
+ *
+ * This reads the file into the func_list array
+ *
+ * @fname: Filename to read
+ * Returns 0 if OK, non-zero on error
+ */
static int read_map_file(const char *fname)
{
FILE *fmap;
@@ -272,28 +356,30 @@ static int read_map_file(const char *fname)
return err;
}
-static int read_profile_file(const char *fname)
+/**
+ * read_trace_file() - Open and read the U-Boot trace file
+ *
+ * Read in the calls from the trace file. The function list is ignored at
+ * present
+ *
+ * @fin: File to read
+ * Returns 0 if OK, non-zero on error
+ */
+static int read_trace_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",
+ error("Cannot open trace data file '%s'\n",
fname);
return 1;
} else {
- err = read_profile(fprof, ¬_found);
+ err = read_trace(fprof);
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;
}
@@ -344,6 +430,7 @@ static void check_trace_config_line(struct trace_configline_info *item)
}
}
+/** check_trace_config() - Check trace-config file, reporting any problems */
static void check_trace_config(void)
{
struct trace_configline_info *line;
@@ -377,6 +464,21 @@ static void check_functions(void)
not_found, removed_code_size);
}
+/**
+ * read_trace_config() - read the trace-config file
+ *
+ * This file consists of lines like:
+ *
+ * include-func <regex>
+ * exclude-func <regex>
+ *
+ * where <regex> is a regular expression matched against function names. It
+ * allows some functions to be dropped from the trace when producing ftrace
+ * records
+ *
+ * @fin: File to process
+ * Returns: 0 if OK, -1 on error
+ */
static int read_trace_config(FILE *fin)
{
char buff[200];
@@ -400,8 +502,7 @@ static int read_trace_config(FILE *fin)
if (!*s || *s == '#')
continue;
- line = (struct trace_configline_info *)calloc(1,
- sizeof(*line));
+ line = (struct trace_configline_info *)calloc(1, sizeof(*line));
if (!line) {
error("Cannot allocate config line\n");
return -1;
@@ -540,15 +641,25 @@ static int make_ftrace(void)
return 0;
}
+/**
+ * prof_tool() - Performs requested action
+ *
+ * @argc: Number of arguments (used to obtain the command
+ * @argv: List of arguments
+ * @trace_fname: Filename of input file (trace data from U-Boot)
+ * @map_fname: Filename of map file (System.map from U-Boot)
+ * @trace_config_fname: Trace-configuration file, or NULL if none
+ * @out_fname: Output filename
+ */
static int prof_tool(int argc, char *const argv[],
- const char *prof_fname, const char *map_fname,
- const char *trace_config_fname)
+ const char *trace_fname, const char *map_fname,
+ const char *trace_config_fname, const char *out_fname)
{
int err = 0;
if (read_map_file(map_fname))
return -1;
- if (prof_fname && read_profile_file(prof_fname))
+ if (trace_fname && read_trace_file(trace_fname))
return -1;
if (trace_config_fname && read_trace_config_file(trace_config_fname))
return -1;
@@ -572,27 +683,27 @@ int main(int argc, char *argv[])
const char *map_fname = "System.map";
const char *trace_fname = NULL;
const char *config_fname = NULL;
+ const char *out_fname = NULL;
int opt;
verbose = 2;
- while ((opt = getopt(argc, argv, "c:m:t:v:")) != -1) {
+ while ((opt = getopt(argc, argv, "c:m:o:t:v:")) != -1) {
switch (opt) {
case 'c':
config_fname = optarg;
break;
-
case 'm':
map_fname = optarg;
break;
-
+ case 'o':
+ out_fname = optarg;
+ break;
case 't':
trace_fname = optarg;
break;
-
case 'v':
verbose = atoi(optarg);
break;
-
default:
usage();
}
@@ -601,6 +712,13 @@ int main(int argc, char *argv[])
if (argc < 1)
usage();
+ if (!out_fname || !map_fname || !trace_fname) {
+ fprintf(stderr,
+ "Must provide trace data, System.map file and output file\n");
+ usage();
+ }
+
debug("Debug enabled\n");
- return prof_tool(argc, argv, trace_fname, map_fname, config_fname);
+ return prof_tool(argc, argv, trace_fname, map_fname, config_fname,
+ out_fname);
}
--
2.39.0.314.g84b9a713c41-goog
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