[PATCH 07/16] perf record: Add support for using symbols in address filters

From: Adrian Hunter
Date: Fri Sep 23 2016 - 10:43:53 EST


Symbols come from either the DSO or /proc/kallsyms for the kernel.
Details of the functionality can be found in Documentation/perf-record.txt.

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
tools/perf/Documentation/perf-record.txt | 55 ++-
tools/perf/builtin-record.c | 14 +-
tools/perf/util/auxtrace.c | 737 +++++++++++++++++++++++++++++++
tools/perf/util/auxtrace.h | 54 +++
4 files changed, 857 insertions(+), 3 deletions(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index babbb63e6d9d..92335193dc33 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -89,9 +89,62 @@ OPTIONS

--filter=<filter>::
Event filter. This option should follow a event selector (-e) which
- selects tracepoint event(s). Multiple '--filter' options are combined
+ selects either tracepoint event(s) or a hardware trace PMU
+ (e.g. Intel PT or CoreSight).
+
+ - tracepoint filters
+
+ In the case of tracepoints, multiple '--filter' options are combined
using '&&'.

+ - address filters
+
+ A hardware trace PMU advertises its ability to accept a number of
+ address filters by specifying a non-zero value in
+ /sys/bus/event_source/devices/<pmu>/nr_addr_filters.
+
+ Address filters have the format:
+
+ filter|start|stop|tracestop <start> [/ <size>] [@<file name>]
+
+ Where:
+ - 'filter': defines a region that will be traced.
+ - 'start': defines an address at which tracing will begin.
+ - 'stop': defines an address at which tracing will stop.
+ - 'tracestop': defines a region in which tracing will stop.
+
+ <file name> is the name of the object file, <start> is the offset to the
+ code to trace in that file, and <size> is the size of the region to
+ trace. 'start' and 'stop' filters need not specify a <size>.
+
+ If no object file is specified then the kernel is assumed, in which case
+ the start address must be a current kernel memory address.
+
+ <start> can also be specified by providing the name of a symbol. If the
+ symbol name is not unique, it can be disambiguated by inserting #n where
+ 'n' selects the n'th symbol in address order. Alternately #0, #g or #G
+ select only a global symbol. <size> can also be specified by providing
+ the name of a symbol, in which case the size is calculated to the end
+ of that symbol. For 'filter' and 'tracestop' filters, if <size> is
+ omitted and <start> is a symbol, then the size is calculated to the end
+ of that symbol.
+
+ If <size> is omitted and <start> is '*', then the start and size will
+ be calculated from the first and last symbols, i.e. to trace the whole
+ file.
+
+ If symbol names (or '*') are provided, they must be surrounded by white
+ space.
+
+ The filter passed to the kernel is not necessarily the same as entered.
+ To see the filter that is passed, use the -v option.
+
+ The kernel may not be able to configure a trace region if it is not
+ within a single mapping. MMAP events (or /proc/<pid>/maps) can be
+ examined to determine if that is a possibility.
+
+ Multiple filters can be separated with space or comma.
+
--exclude-perf::
Don't record events issued by perf itself. This option should follow
a event selector (-e) which selects tracepoint event(s). It adds a
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 962adcfc43a5..67d2a9003294 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1581,6 +1581,18 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
if (err)
goto out;

+ /*
+ * Allow aliases to facilitate the lookup of symbols for address
+ * filters. Refer to auxtrace_parse_filters().
+ */
+ symbol_conf.allow_aliases = true;
+
+ symbol__init(NULL);
+
+ err = auxtrace_parse_filters(rec->evlist);
+ if (err)
+ goto out;
+
if (dry_run)
goto out;

@@ -1594,8 +1606,6 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)

err = -ENOMEM;

- symbol__init(NULL);
-
if (symbol_conf.kptr_restrict)
pr_warning(
"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index c0aba8e839aa..c5a6e0b12452 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -16,6 +16,10 @@
#include <sys/types.h>
#include <sys/mman.h>
#include <stdbool.h>
+#include <ctype.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>

#include <linux/kernel.h>
#include <linux/perf_event.h>
@@ -35,9 +39,14 @@
#include "../perf.h"
#include "util.h"
#include "evlist.h"
+#include "dso.h"
+#include "map.h"
+#include "pmu.h"
+#include "evsel.h"
#include "cpumap.h"
#include "thread_map.h"
#include "asm/bug.h"
+#include "symbol/kallsyms.h"
#include "auxtrace.h"

#include <linux/hash.h>
@@ -1399,3 +1408,731 @@ void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key)

return NULL;
}
+
+static void addr_filter__free_str(struct addr_filter *filt)
+{
+ free(filt->str);
+ filt->action = NULL;
+ filt->sym_from = NULL;
+ filt->sym_to = NULL;
+ filt->filename = NULL;
+ filt->str = NULL;
+}
+
+static struct addr_filter *addr_filter__new(void)
+{
+ struct addr_filter *filt = zalloc(sizeof(*filt));
+
+ if (filt)
+ INIT_LIST_HEAD(&filt->list);
+
+ return filt;
+}
+
+static void addr_filter__free(struct addr_filter *filt)
+{
+ if (filt)
+ addr_filter__free_str(filt);
+ free(filt);
+}
+
+static void addr_filters__add(struct addr_filters *filts,
+ struct addr_filter *filt)
+{
+ list_add_tail(&filt->list, &filts->head);
+ filts->cnt += 1;
+}
+
+static void addr_filters__del(struct addr_filters *filts,
+ struct addr_filter *filt)
+{
+ list_del_init(&filt->list);
+ filts->cnt -= 1;
+}
+
+void addr_filters__init(struct addr_filters *filts)
+{
+ INIT_LIST_HEAD(&filts->head);
+ filts->cnt = 0;
+}
+
+void addr_filters__exit(struct addr_filters *filts)
+{
+ struct addr_filter *filt, *n;
+
+ list_for_each_entry_safe(filt, n, &filts->head, list) {
+ addr_filters__del(filts, filt);
+ addr_filter__free(filt);
+ }
+}
+
+static int parse_num_or_str(char **inp, u64 *num, const char **str,
+ const char *str_delim)
+{
+ *inp += strspn(*inp, " ");
+
+ if (isdigit(**inp)) {
+ char *endptr;
+
+ if (!num)
+ return -EINVAL;
+ errno = 0;
+ *num = strtoull(*inp, &endptr, 0);
+ if (errno)
+ return -errno;
+ if (endptr == *inp)
+ return -EINVAL;
+ *inp = endptr;
+ } else {
+ size_t n;
+
+ if (!str)
+ return -EINVAL;
+ *inp += strspn(*inp, " ");
+ *str = *inp;
+ n = strcspn(*inp, str_delim);
+ if (!n)
+ return -EINVAL;
+ *inp += n;
+ if (**inp) {
+ **inp = '\0';
+ *inp += 1;
+ }
+ }
+ return 0;
+}
+
+static int parse_action(struct addr_filter *filt)
+{
+ if (!strcmp(filt->action, "filter")) {
+ filt->start = true;
+ filt->range = true;
+ } else if (!strcmp(filt->action, "start")) {
+ filt->start = true;
+ } else if (!strcmp(filt->action, "stop")) {
+ filt->start = false;
+ } else if (!strcmp(filt->action, "tracestop")) {
+ filt->start = false;
+ filt->range = true;
+ filt->action += 5; /* Change 'tracestop' to 'stop' */
+ } else {
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int parse_sym_idx(char **inp, int *idx)
+{
+ *idx = -1;
+
+ *inp += strspn(*inp, " ");
+
+ if (**inp != '#')
+ return 0;
+
+ *inp += 1;
+
+ if (**inp == 'g' || **inp == 'G') {
+ *inp += 1;
+ *idx = 0;
+ } else {
+ unsigned long num;
+ char *endptr;
+
+ errno = 0;
+ num = strtoul(*inp, &endptr, 0);
+ if (errno)
+ return -errno;
+ if (endptr == *inp || num > INT_MAX)
+ return -EINVAL;
+ *inp = endptr;
+ *idx = num;
+ }
+
+ return 0;
+}
+
+static int parse_addr_size(char **inp, u64 *num, const char **str, int *idx)
+{
+ int err = parse_num_or_str(inp, num, str, " ");
+
+ if (!err && *str)
+ err = parse_sym_idx(inp, idx);
+
+ return err;
+}
+
+static int parse_one_filter(struct addr_filter *filt, const char **filter_inp)
+{
+ char *fstr;
+ int err;
+
+ filt->str = fstr = strdup(*filter_inp);
+ if (!fstr)
+ return -ENOMEM;
+
+ err = parse_num_or_str(&fstr, NULL, &filt->action, " ");
+ if (err)
+ goto out_err;
+
+ err = parse_action(filt);
+ if (err)
+ goto out_err;
+
+ err = parse_addr_size(&fstr, &filt->addr, &filt->sym_from,
+ &filt->sym_from_idx);
+ if (err)
+ goto out_err;
+
+ fstr += strspn(fstr, " ");
+
+ if (*fstr == '/') {
+ fstr += 1;
+ err = parse_addr_size(&fstr, &filt->size, &filt->sym_to,
+ &filt->sym_to_idx);
+ if (err)
+ goto out_err;
+ filt->range = true;
+ }
+
+ fstr += strspn(fstr, " ");
+
+ if (*fstr == '@') {
+ fstr += 1;
+ err = parse_num_or_str(&fstr, NULL, &filt->filename, " ,");
+ if (err)
+ goto out_err;
+ }
+
+ fstr += strspn(fstr, " ,");
+
+ *filter_inp += fstr - filt->str;
+
+ return 0;
+
+out_err:
+ addr_filter__free_str(filt);
+
+ return err;
+}
+
+int addr_filters__parse_bare_filter(struct addr_filters *filts,
+ const char *filter)
+{
+ struct addr_filter *filt;
+ const char *fstr = filter;
+ int err;
+
+ while (*fstr) {
+ filt = addr_filter__new();
+ err = parse_one_filter(filt, &fstr);
+ if (err) {
+ addr_filter__free(filt);
+ addr_filters__exit(filts);
+ return err;
+ }
+ addr_filters__add(filts, filt);
+ }
+
+ return 0;
+}
+
+struct sym_args {
+ const char *name;
+ u64 start;
+ u64 size;
+ int idx;
+ int cnt;
+ bool started;
+ bool global;
+ bool selected;
+ bool duplicate;
+ bool near;
+};
+
+static bool kern_sym_match(struct sym_args *args, const char *name, char type)
+{
+ /* A function with the same name, and global or the n'th found or any */
+ return symbol_type__is_a(type, MAP__FUNCTION) &&
+ !strcmp(name, args->name) &&
+ ((args->global && isupper(type)) ||
+ (args->selected && ++(args->cnt) == args->idx) ||
+ (!args->global && !args->selected));
+}
+
+static int find_kern_sym_cb(void *arg, const char *name, char type, u64 start)
+{
+ struct sym_args *args = arg;
+
+ if (args->started) {
+ if (!args->size)
+ args->size = start - args->start;
+ if (args->selected) {
+ if (args->size)
+ return 1;
+ } else if (kern_sym_match(args, name, type)) {
+ args->duplicate = true;
+ return 1;
+ }
+ } else if (kern_sym_match(args, name, type)) {
+ args->started = true;
+ args->start = start;
+ }
+
+ return 0;
+}
+
+static int print_kern_sym_cb(void *arg, const char *name, char type, u64 start)
+{
+ struct sym_args *args = arg;
+
+ if (kern_sym_match(args, name, type)) {
+ pr_err("#%d\t0x%"PRIx64"\t%c\t%s\n",
+ ++args->cnt, start, type, name);
+ args->near = true;
+ } else if (args->near) {
+ args->near = false;
+ pr_err("\t\twhich is near\t\t%s\n", name);
+ }
+
+ return 0;
+}
+
+static int sym_not_found_error(const char *sym_name, int idx)
+{
+ if (idx > 0) {
+ pr_err("N'th occurrence (N=%d) of symbol '%s' not found.\n",
+ idx, sym_name);
+ } else if (!idx) {
+ pr_err("Global symbol '%s' not found.\n", sym_name);
+ } else {
+ pr_err("Symbol '%s' not found.\n", sym_name);
+ }
+ pr_err("Note that symbols must be functions.\n");
+
+ return -EINVAL;
+}
+
+static int find_kern_sym(const char *sym_name, u64 *start, u64 *size, int idx)
+{
+ struct sym_args args = {
+ .name = sym_name,
+ .idx = idx,
+ .global = !idx,
+ .selected = idx > 0,
+ };
+ int err;
+
+ *start = 0;
+ *size = 0;
+
+ err = kallsyms__parse("/proc/kallsyms", &args, find_kern_sym_cb);
+ if (err < 0) {
+ pr_err("Failed to parse /proc/kallsyms\n");
+ return err;
+ }
+
+ if (args.duplicate) {
+ pr_err("Multiple kernel symbols with name '%s'\n", sym_name);
+ args.cnt = 0;
+ kallsyms__parse("/proc/kallsyms", &args, print_kern_sym_cb);
+ pr_err("Disambiguate symbol name by inserting #n after the name e.g. %s #2\n",
+ sym_name);
+ pr_err("Or select a global symbol by inserting #0 or #g or #G\n");
+ return -EINVAL;
+ }
+
+ if (!args.started) {
+ pr_err("Kernel symbol lookup: ");
+ return sym_not_found_error(sym_name, idx);
+ }
+
+ *start = args.start;
+ *size = args.size;
+
+ return 0;
+}
+
+static int find_entire_kern_cb(void *arg, const char *name __maybe_unused,
+ char type, u64 start)
+{
+ struct sym_args *args = arg;
+
+ if (!symbol_type__is_a(type, MAP__FUNCTION))
+ return 0;
+
+ if (!args->started) {
+ args->started = true;
+ args->start = start;
+ }
+ /* Don't know exactly where the kernel ends, so we add a page */
+ args->size = round_up(start, page_size) + page_size - args->start;
+
+ return 0;
+}
+
+static int addr_filter__entire_kernel(struct addr_filter *filt)
+{
+ struct sym_args args = { .started = false };
+ int err;
+
+ err = kallsyms__parse("/proc/kallsyms", &args, find_entire_kern_cb);
+ if (err < 0 || !args.started) {
+ pr_err("Failed to parse /proc/kallsyms\n");
+ return err;
+ }
+
+ filt->addr = args.start;
+ filt->size = args.size;
+
+ return 0;
+}
+
+static int check_end_after_start(struct addr_filter *filt, u64 start, u64 size)
+{
+ if (start + size >= filt->addr)
+ return 0;
+
+ if (filt->sym_from) {
+ pr_err("Symbol '%s' (0x%"PRIx64") comes before '%s' (0x%"PRIx64")\n",
+ filt->sym_to, start, filt->sym_from, filt->addr);
+ } else {
+ pr_err("Symbol '%s' (0x%"PRIx64") comes before address 0x%"PRIx64")\n",
+ filt->sym_to, start, filt->addr);
+ }
+
+ return -EINVAL;
+}
+
+static int addr_filter__resolve_kernel_syms(struct addr_filter *filt)
+{
+ bool no_size = false;
+ u64 start, size;
+ int err;
+
+ if (symbol_conf.kptr_restrict) {
+ pr_err("Kernel addresses are restricted. Unable to resolve kernel symbols.\n");
+ return -EINVAL;
+ }
+
+ if (filt->sym_from && !strcmp(filt->sym_from, "*"))
+ return addr_filter__entire_kernel(filt);
+
+ if (filt->sym_from) {
+ err = find_kern_sym(filt->sym_from, &start, &size,
+ filt->sym_from_idx);
+ if (err)
+ return err;
+ filt->addr = start;
+ if (filt->range && !filt->size && !filt->sym_to) {
+ filt->size = size;
+ no_size = !!size;
+ }
+ }
+
+ if (filt->sym_to) {
+ err = find_kern_sym(filt->sym_to, &start, &size,
+ filt->sym_to_idx);
+ if (err)
+ return err;
+
+ err = check_end_after_start(filt, start, size);
+ if (err)
+ return err;
+ filt->size = start + size - filt->addr;
+ no_size = !!size;
+ }
+
+ /* The very last symbol in kallsyms does not imply a particular size */
+ if (no_size) {
+ pr_err("Cannot determine size of symbol '%s'\n",
+ filt->sym_to ? filt->sym_to : filt->sym_from);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct dso *load_dso(const char *name)
+{
+ struct map *map;
+ struct dso *dso;
+
+ map = dso__new_map(name);
+ if (!map)
+ return NULL;
+
+ map__load(map);
+
+ dso = dso__get(map->dso);
+
+ map__put(map);
+
+ return dso;
+}
+
+static bool dso_sym_match(struct symbol *sym, const char *name, int *cnt,
+ int idx)
+{
+ /* Same name, and global or the n'th found or any */
+ return !arch__compare_symbol_names(name, sym->name) &&
+ ((!idx && sym->binding == STB_GLOBAL) ||
+ (idx > 0 && ++*cnt == idx) ||
+ idx < 0);
+}
+
+static void print_duplicate_syms(struct dso *dso, const char *sym_name)
+{
+ struct symbol *sym;
+ bool near = false;
+ int cnt = 0;
+
+ pr_err("Multiple symbols with name '%s'\n", sym_name);
+
+ sym = dso__first_symbol(dso, MAP__FUNCTION);
+ while (sym) {
+ if (dso_sym_match(sym, sym_name, &cnt, -1)) {
+ pr_err("#%d\t0x%"PRIx64"\t%c\t%s\n",
+ ++cnt, sym->start,
+ sym->binding == STB_GLOBAL ? 'g' :
+ sym->binding == STB_LOCAL ? 'l' : 'w',
+ sym->name);
+ near = true;
+ } else if (near) {
+ near = false;
+ pr_err("\t\twhich is near\t\t%s\n", sym->name);
+ }
+ sym = dso__next_symbol(sym);
+ }
+
+ pr_err("Disambiguate symbol name by inserting #n after the name e.g. %s #2\n",
+ sym_name);
+ pr_err("Or select a global symbol by inserting #0 or #g or #G\n");
+}
+
+static int find_dso_sym(struct dso *dso, const char *sym_name, u64 *start,
+ u64 *size, int idx)
+{
+ struct symbol *sym;
+ int cnt = 0;
+
+ *start = 0;
+ *size = 0;
+
+ sym = dso__first_symbol(dso, MAP__FUNCTION);
+ while (sym) {
+ if (*start) {
+ if (!*size)
+ *size = sym->start - *start;
+ if (idx > 0) {
+ if (*size)
+ return 1;
+ } else if (dso_sym_match(sym, sym_name, &cnt, idx)) {
+ print_duplicate_syms(dso, sym_name);
+ return -EINVAL;
+ }
+ } else if (dso_sym_match(sym, sym_name, &cnt, idx)) {
+ *start = sym->start;
+ *size = sym->end - sym->start;
+ }
+ sym = dso__next_symbol(sym);
+ }
+
+ if (!*start)
+ return sym_not_found_error(sym_name, idx);
+
+ return 0;
+}
+
+static int addr_filter__entire_dso(struct addr_filter *filt, struct dso *dso)
+{
+ struct symbol *first_sym = dso__first_symbol(dso, MAP__FUNCTION);
+ struct symbol *last_sym = dso__last_symbol(dso, MAP__FUNCTION);
+
+ if (!first_sym || !last_sym) {
+ pr_err("Failed to determine filter for %s\nNo symbols found.\n",
+ filt->filename);
+ return -EINVAL;
+ }
+
+ filt->addr = first_sym->start;
+ filt->size = last_sym->end - first_sym->start;
+
+ return 0;
+}
+
+static int addr_filter__resolve_syms(struct addr_filter *filt)
+{
+ u64 start, size;
+ struct dso *dso;
+ int err = 0;
+
+ if (!filt->sym_from && !filt->sym_to)
+ return 0;
+
+ if (!filt->filename)
+ return addr_filter__resolve_kernel_syms(filt);
+
+ dso = load_dso(filt->filename);
+ if (!dso) {
+ pr_err("Failed to load symbols from: %s\n", filt->filename);
+ return -EINVAL;
+ }
+
+ if (filt->sym_from && !strcmp(filt->sym_from, "*")) {
+ err = addr_filter__entire_dso(filt, dso);
+ goto put_dso;
+ }
+
+ if (filt->sym_from) {
+ err = find_dso_sym(dso, filt->sym_from, &start, &size,
+ filt->sym_from_idx);
+ if (err)
+ goto put_dso;
+ filt->addr = start;
+ if (filt->range && !filt->size && !filt->sym_to)
+ filt->size = size;
+ }
+
+ if (filt->sym_to) {
+ err = find_dso_sym(dso, filt->sym_to, &start, &size,
+ filt->sym_to_idx);
+ if (err)
+ goto put_dso;
+
+ err = check_end_after_start(filt, start, size);
+ if (err)
+ return err;
+
+ filt->size = start + size - filt->addr;
+ }
+
+put_dso:
+ dso__put(dso);
+
+ return err;
+}
+
+static char *addr_filter__to_str(struct addr_filter *filt)
+{
+ char filename_buf[PATH_MAX];
+ const char *at = "";
+ const char *fn = "";
+ char *filter;
+ int err;
+
+ if (filt->filename) {
+ at = "@";
+ fn = realpath(filt->filename, filename_buf);
+ if (!fn)
+ return NULL;
+ }
+
+ if (filt->range) {
+ err = asprintf(&filter, "%s 0x%"PRIx64"/0x%"PRIx64"%s%s",
+ filt->action, filt->addr, filt->size, at, fn);
+ } else {
+ err = asprintf(&filter, "%s 0x%"PRIx64"%s%s",
+ filt->action, filt->addr, at, fn);
+ }
+
+ return err < 0 ? NULL : filter;
+}
+
+static int parse_addr_filter(struct perf_evsel *evsel, const char *filter,
+ int max_nr)
+{
+ struct addr_filters filts;
+ struct addr_filter *filt;
+ int err;
+
+ addr_filters__init(&filts);
+
+ err = addr_filters__parse_bare_filter(&filts, filter);
+ if (err)
+ goto out_exit;
+
+ if (filts.cnt > max_nr) {
+ pr_err("Error: number of address filters (%d) exceeds maximum (%d)\n",
+ filts.cnt, max_nr);
+ err = -EINVAL;
+ goto out_exit;
+ }
+
+ list_for_each_entry(filt, &filts.head, list) {
+ char *new_filter;
+
+ err = addr_filter__resolve_syms(filt);
+ if (err)
+ goto out_exit;
+
+ new_filter = addr_filter__to_str(filt);
+ if (!new_filter) {
+ err = -ENOMEM;
+ goto out_exit;
+ }
+
+ if (perf_evsel__append_addr_filter(evsel, new_filter)) {
+ err = -ENOMEM;
+ goto out_exit;
+ }
+ }
+
+out_exit:
+ addr_filters__exit(&filts);
+
+ if (err) {
+ pr_err("Failed to parse address filter: '%s'\n", filter);
+ pr_err("Filter format is: filter|start|stop|tracestop <start symbol or address> [/ <end symbol or size>] [@<file name>]\n");
+ pr_err("Where multiple filters are separated by space or comma.\n");
+ }
+
+ return err;
+}
+
+static struct perf_pmu *perf_evsel__find_pmu(struct perf_evsel *evsel)
+{
+ struct perf_pmu *pmu = NULL;
+
+ while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+ if (pmu->type == evsel->attr.type)
+ break;
+ }
+
+ return pmu;
+}
+
+static int perf_evsel__nr_addr_filter(struct perf_evsel *evsel)
+{
+ struct perf_pmu *pmu = perf_evsel__find_pmu(evsel);
+ int nr_addr_filters = 0;
+
+ if (!pmu)
+ return 0;
+
+ perf_pmu__scan_file(pmu, "nr_addr_filters", "%d", &nr_addr_filters);
+
+ return nr_addr_filters;
+}
+
+int auxtrace_parse_filters(struct perf_evlist *evlist)
+{
+ struct perf_evsel *evsel;
+ char *filter;
+ int err, max_nr;
+
+ evlist__for_each_entry(evlist, evsel) {
+ filter = evsel->filter;
+ max_nr = perf_evsel__nr_addr_filter(evsel);
+ if (!filter || !max_nr)
+ continue;
+ evsel->filter = NULL;
+ err = parse_addr_filter(evsel, filter, max_nr);
+ free(filter);
+ if (err)
+ return err;
+ pr_debug("Address filter: %s\n", evsel->filter);
+ }
+
+ return 0;
+}
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 09286f193532..26fb1ee5746a 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -318,6 +318,48 @@ struct auxtrace_record {
unsigned int alignment;
};

+/**
+ * struct addr_filter - address filter.
+ * @list: list node
+ * @range: true if it is a range filter
+ * @start: true if action is 'filter' or 'start'
+ * @action: 'filter', 'start' or 'stop' ('tracestop' is accepted but converted
+ * to 'stop')
+ * @sym_from: symbol name for the filter address
+ * @sym_to: symbol name that determines the filter size
+ * @sym_from_idx: selects n'th from symbols with the same name (0 means global
+ * and less than 0 means symbol must be unique)
+ * @sym_to_idx: same as @sym_from_idx but for @sym_to
+ * @addr: filter address
+ * @size: filter region size (for range filters)
+ * @filename: DSO file name or NULL for the kernel
+ * @str: allocated string that contains the other string members
+ */
+struct addr_filter {
+ struct list_head list;
+ bool range;
+ bool start;
+ const char *action;
+ const char *sym_from;
+ const char *sym_to;
+ int sym_from_idx;
+ int sym_to_idx;
+ u64 addr;
+ u64 size;
+ const char *filename;
+ char *str;
+};
+
+/**
+ * struct addr_filters - list of address filters.
+ * @head: list of address filters
+ * @cnt: number of address filters
+ */
+struct addr_filters {
+ struct list_head head;
+ int cnt;
+};
+
#ifdef HAVE_AUXTRACE_SUPPORT

/*
@@ -482,6 +524,12 @@ void perf_session__auxtrace_error_inc(struct perf_session *session,
union perf_event *event);
void events_stats__auxtrace_error_warn(const struct events_stats *stats);

+void addr_filters__init(struct addr_filters *filts);
+void addr_filters__exit(struct addr_filters *filts);
+int addr_filters__parse_bare_filter(struct addr_filters *filts,
+ const char *filter);
+int auxtrace_parse_filters(struct perf_evlist *evlist);
+
static inline int auxtrace__process_event(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample,
@@ -640,6 +688,12 @@ void auxtrace_index__free(struct list_head *head __maybe_unused)
{
}

+static inline
+int auxtrace_parse_filters(struct perf_evlist *evlist __maybe_unused)
+{
+ return 0;
+}
+
int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
struct auxtrace_mmap_params *mp,
void *userpg, int fd);
--
1.9.1