perf tools: Consolidate symbol resolving across all tools

Now we have a very high level routine for simple tools to
process IP sample events:

	int event__preprocess_sample(const event_t *self,
				     struct addr_location *al,
				     symbol_filter_t filter)

It receives the event itself and will insert new threads in the
global threads list and resolve the map and symbol, filling all
this info into the new addr_location struct, so that tools like
annotate and report can further process the event by creating
hist_entries in their specific way (with or without callgraphs,
etc).

It in turn uses the new next layer function:

	void thread__find_addr_location(struct thread *self, u8 cpumode,
					enum map_type type, u64 addr,
					struct addr_location *al,
					symbol_filter_t filter)

This one will, given a thread (userspace or the kernel kthread
one), will find the given type (MAP__FUNCTION now, MAP__VARIABLE
too in the near future) at the given cpumode, taking vdsos into
account (userspace hit, but kernel symbol) and will fill all
these details in the addr_location given.

Tools that need a more compact API for plain function
resolution, like 'kmem', can use this other one:

	struct symbol *thread__find_function(struct thread *self, u64 addr,
					     symbol_filter_t filter)

So, to resolve a kernel symbol, that is all the 'kmem' tool
needs, its just a matter of calling:

	sym = thread__find_function(kthread, addr, NULL);

The 'filter' parameter is needed because we do lazy
parsing/loading of ELF symtabs or /proc/kallsyms.

With this we remove more code duplication all around, which is
always good, huh? :-)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-12-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

8 files changed, 117 insertions, 41 deletions

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 70b4aa03b472..233d7ad9bd7f 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -249,3 +249,65 @@ int event__process_task(event_t *self)
 
 	return 0;
 }
+
+void thread__find_addr_location(struct thread *self, u8 cpumode,
+				enum map_type type, u64 addr,
+				struct addr_location *al,
+				symbol_filter_t filter)
+{
+	struct thread *thread = al->thread = self;
+
+	al->addr = addr;
+
+	if (cpumode & PERF_RECORD_MISC_KERNEL) {
+		al->level = 'k';
+		thread = kthread;
+	} else if (cpumode & PERF_RECORD_MISC_USER)
+		al->level = '.';
+	else {
+		al->level = 'H';
+		al->map = NULL;
+		al->sym = NULL;
+		return;
+	}
+try_again:
+	al->map = thread__find_map(thread, type, al->addr);
+	if (al->map == NULL) {
+		/*
+		 * If this is outside of all known maps, and is a negative
+		 * address, try to look it up in the kernel dso, as it might be
+		 * a vsyscall or vdso (which executes in user-mode).
+		 *
+		 * XXX This is nasty, we should have a symbol list in the
+		 * "[vdso]" dso, but for now lets use the old trick of looking
+		 * in the whole kernel symbol list.
+		 */
+		if ((long long)al->addr < 0 && thread != kthread) {
+			thread = kthread;
+			goto try_again;
+		}
+		al->sym = NULL;
+	} else {
+		al->addr = al->map->map_ip(al->map, al->addr);
+		al->sym = map__find_symbol(al->map, al->addr, filter);
+	}
+}
+
+int event__preprocess_sample(const event_t *self, struct addr_location *al,
+			     symbol_filter_t filter)
+{
+	u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+	struct thread *thread = threads__findnew(self->ip.pid);
+
+	if (thread == NULL)
+		return -1;
+
+	dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
+
+	thread__find_addr_location(thread, cpumode, MAP__FUNCTION,
+				   self->ip.ip, al, filter);
+	dump_printf(" ...... dso: %s\n",
+		    al->map ? al->map->dso->long_name :
+			al->level == 'H' ? "[hypervisor]" : "<not found>");
+	return 0;
+}
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 13c12c75f970..a4cc8105cf67 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -152,4 +152,8 @@ int event__process_lost(event_t *self);
 int event__process_mmap(event_t *self);
 int event__process_task(event_t *self);
 
+struct addr_location;
+int event__preprocess_sample(const event_t *self, struct addr_location *al,
+			     symbol_filter_t filter);
+
 #endif /* __PERF_RECORD_H */
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index f26cd9ba00fd..0ebf6ee16caa 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -14,20 +14,19 @@ struct callchain_param	callchain_param = {
  * histogram, sorted on item, collects counts
  */
 
-struct hist_entry *__hist_entry__add(struct thread *thread, struct map *map,
-				     struct symbol *sym,
+struct hist_entry *__hist_entry__add(struct addr_location *al,
 				     struct symbol *sym_parent,
-				     u64 ip, u64 count, char level, bool *hit)
+				     u64 count, bool *hit)
 {
 	struct rb_node **p = &hist.rb_node;
 	struct rb_node *parent = NULL;
 	struct hist_entry *he;
 	struct hist_entry entry = {
-		.thread	= thread,
-		.map	= map,
-		.sym	= sym,
-		.ip	= ip,
-		.level	= level,
+		.thread	= al->thread,
+		.map	= al->map,
+		.sym	= al->sym,
+		.ip	= al->addr,
+		.level	= al->level,
 		.count	= count,
 		.parent = sym_parent,
 	};
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index ac2149c559b0..3020db0c9292 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -36,9 +36,9 @@ extern unsigned long total_fork;
 extern unsigned long total_unknown;
 extern unsigned long total_lost;
 
-struct hist_entry *__hist_entry__add(struct thread *thread, struct map *map,
-				     struct symbol *sym, struct symbol *parent,
-				     u64 ip, u64 count, char level, bool *hit);
+struct hist_entry *__hist_entry__add(struct addr_location *al,
+				     struct symbol *parent,
+				     u64 count, bool *hit);
 extern int64_t hist_entry__cmp(struct hist_entry *, struct hist_entry *);
 extern int64_t hist_entry__collapse(struct hist_entry *, struct hist_entry *);
 extern void hist_entry__free(struct hist_entry *);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index b788c2f5d672..fffcb937cdcb 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -43,7 +43,8 @@ static struct symbol_conf symbol_conf__defaults = {
 	.try_vmlinux_path = true,
 };
 
-static struct thread kthread_mem, *kthread = &kthread_mem;
+static struct thread kthread_mem;
+struct thread *kthread = &kthread_mem;
 
 bool dso__loaded(const struct dso *self, enum map_type type)
 {
@@ -1178,29 +1179,6 @@ out:
 	return ret;
 }
 
-static struct symbol *thread__find_symbol(struct thread *self, u64 ip,
-					  enum map_type type, struct map **mapp,
-					  symbol_filter_t filter)
-{
-	struct map *map = thread__find_map(self, type, ip);
-
-	if (mapp)
-		*mapp = map;
-
-	if (map) {
-		ip = map->map_ip(map, ip);
-		return map__find_symbol(map, ip, filter);
-	}
-
-	return NULL;
-}
-
-struct symbol *kernel_maps__find_function(u64 ip, struct map **mapp,
-					  symbol_filter_t filter)
-{
-	return thread__find_symbol(kthread, ip, MAP__FUNCTION, mapp, filter);
-}
-
 static struct map *thread__find_map_by_name(struct thread *self, char *name)
 {
 	struct rb_node *nd;
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 3f9e4a4d83dd..17003efa0b39 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -63,6 +63,14 @@ static inline void *symbol__priv(struct symbol *self)
 	return ((void *)self) - symbol__priv_size;
 }
 
+struct addr_location {
+	struct thread *thread;
+	struct map    *map;
+	struct symbol *sym;
+	u64	      addr;
+	char	      level;
+};
+
 struct dso {
 	struct list_head node;
 	struct rb_root	 symbols[MAP__NR_TYPES];
@@ -105,6 +113,8 @@ size_t kernel_maps__fprintf(FILE *fp);
 
 int symbol__init(struct symbol_conf *conf);
 
+struct thread;
+struct thread *kthread;
 extern struct list_head dsos__user, dsos__kernel;
 extern struct dso *vdso;
 #endif /* __PERF_SYMBOL */
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 2229f82cd630..603f5610861b 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -285,3 +285,15 @@ size_t threads__fprintf(FILE *fp)
 
 	return ret;
 }
+
+struct symbol *thread__find_symbol(struct thread *self,
+				   enum map_type type, u64 addr,
+				   symbol_filter_t filter)
+{
+	struct map *map = thread__find_map(self, type, addr);
+
+	if (map != NULL)
+		return map__find_symbol(map, map->map_ip(map, addr), filter);
+
+	return NULL;
+}
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 59b0d9b577d6..686d6e914d9e 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -27,19 +27,30 @@ size_t thread__fprintf_maps(struct thread *self, FILE *fp);
 size_t threads__fprintf(FILE *fp);
 
 void maps__insert(struct rb_root *maps, struct map *map);
-struct map *maps__find(struct rb_root *maps, u64 ip);
-
-struct symbol *kernel_maps__find_function(const u64 ip, struct map **mapp,
-					  symbol_filter_t filter);
+struct map *maps__find(struct rb_root *maps, u64 addr);
 
 static inline struct map *thread__find_map(struct thread *self,
-					   enum map_type type, u64 ip)
+					   enum map_type type, u64 addr)
 {
-	return self ? maps__find(&self->maps[type], ip) : NULL;
+	return self ? maps__find(&self->maps[type], addr) : NULL;
 }
 
 static inline void __thread__insert_map(struct thread *self, struct map *map)
 {
 	 maps__insert(&self->maps[map->type], map);
 }
+
+void thread__find_addr_location(struct thread *self, u8 cpumode,
+				enum map_type type, u64 addr,
+				struct addr_location *al,
+				symbol_filter_t filter);
+struct symbol *thread__find_symbol(struct thread *self,
+				   enum map_type type, u64 addr,
+				   symbol_filter_t filter);
+
+static inline struct symbol *
+thread__find_function(struct thread *self, u64 addr, symbol_filter_t filter)
+{
+	return thread__find_symbol(self, MAP__FUNCTION, addr, filter);
+}
 #endif	/* __PERF_THREAD_H */