perf unwind: Introduce 'struct unwind_libunwind_ops' for local unwind

Currently, libunwind operations are fixed, and they are chosen according
to the host architecture. This will lead to a problem that if a thread
is run as x86_32 on a x86_64 machine, perf will use libunwind methods
for x86_64 to parse the callchain and get wrong results.

This patch changes the fixed methods of libunwind operations to be
thread/map related, and each thread can have individual libunwind
operations. Local libunwind methods are registered as default value.

Signed-off-by: He Kuang <hekuang@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ekaterina Tumanova <tumanova@linux.vnet.ibm.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1464924803-22214-4-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 61 insertions, 5 deletions

diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 4c9f0aa11f1f..07ffb18221ab 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -11,6 +11,7 @@
 #include <intlist.h>
 
 struct thread_stack;
+struct unwind_libunwind_ops;
 
 struct thread {
         union {
@@ -33,7 +34,8 @@ struct thread {
         void                    *priv;
         struct thread_stack     *ts;
 #ifdef HAVE_LIBUNWIND_SUPPORT
-        void                    *addr_space;
+        void                            *addr_space;
+        struct unwind_libunwind_ops     *unwind_libunwind_ops;
 #endif
 };
 
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index 63687d3a344e..b0c5db1333f9 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -579,7 +579,7 @@ static unw_accessors_t accessors = {
         .get_proc_name          = get_proc_name,
 };
 
-int unwind__prepare_access(struct thread *thread)
+static int _unwind__prepare_access(struct thread *thread)
 {
         if (callchain_param.record_mode != CALLCHAIN_DWARF)
                 return 0;
@@ -594,7 +594,7 @@ int unwind__prepare_access(struct thread *thread)
         return 0;
 }
 
-void unwind__flush_access(struct thread *thread)
+static void _unwind__flush_access(struct thread *thread)
 {
         if (callchain_param.record_mode != CALLCHAIN_DWARF)
                 return;
@@ -602,7 +602,7 @@ void unwind__flush_access(struct thread *thread)
         unw_flush_cache(thread->addr_space, 0, 0);
 }
 
-void unwind__finish_access(struct thread *thread)
+static void _unwind__finish_access(struct thread *thread)
 {
         if (callchain_param.record_mode != CALLCHAIN_DWARF)
                 return;
@@ -662,7 +662,7 @@ static int get_entries(struct unwind_info *ui, unwind_entry_cb_t cb,
         return ret;
 }
 
-int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
+static int _unwind__get_entries(unwind_entry_cb_t cb, void *arg,
                         struct thread *thread,
                         struct perf_sample *data, int max_stack)
 {
@@ -680,3 +680,48 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
 
         return get_entries(&ui, cb, arg, max_stack);
 }
+
+static struct unwind_libunwind_ops
+_unwind_libunwind_ops = {
+        .prepare_access = _unwind__prepare_access,
+        .flush_access   = _unwind__flush_access,
+        .finish_access  = _unwind__finish_access,
+        .get_entries    = _unwind__get_entries,
+};
+
+struct unwind_libunwind_ops *
+local_unwind_libunwind_ops = &_unwind_libunwind_ops;
+
+static void unwind__register_ops(struct thread *thread,
+                                 struct unwind_libunwind_ops *ops)
+{
+        thread->unwind_libunwind_ops = ops;
+}
+
+int unwind__prepare_access(struct thread *thread)
+{
+        unwind__register_ops(thread, local_unwind_libunwind_ops);
+
+        return thread->unwind_libunwind_ops->prepare_access(thread);
+}
+
+void unwind__flush_access(struct thread *thread)
+{
+        if (thread->unwind_libunwind_ops)
+                thread->unwind_libunwind_ops->flush_access(thread);
+}
+
+void unwind__finish_access(struct thread *thread)
+{
+        if (thread->unwind_libunwind_ops)
+                thread->unwind_libunwind_ops->finish_access(thread);
+}
+
+int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
+                         struct thread *thread,
+                         struct perf_sample *data, int max_stack)
+{
+        if (thread->unwind_libunwind_ops)
+                return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
+        return 0;
+}
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index 12790cf94618..bbd73d9bea45 100644
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -14,6 +14,15 @@ struct unwind_entry {
 
 typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry, void *arg);
 
+struct unwind_libunwind_ops {
+        int (*prepare_access)(struct thread *thread);
+        void (*flush_access)(struct thread *thread);
+        void (*finish_access)(struct thread *thread);
+        int (*get_entries)(unwind_entry_cb_t cb, void *arg,
+                           struct thread *thread,
+                           struct perf_sample *data, int max_stack);
+};
+
 #ifdef HAVE_DWARF_UNWIND_SUPPORT
 int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
                         struct thread *thread,