Merge branch 'next' into for-linus

Prepare input updates for 3.16.

1 files changed, 144 insertions, 0 deletions

diff --git a/tools/perf/tests/dwarf-unwind.c b/tools/perf/tests/dwarf-unwind.c
new file mode 100644
index 000000000000..c059ee81c038
--- /dev/null
+++ b/tools/perf/tests/dwarf-unwind.c
@@ -0,0 +1,144 @@
+#include <linux/compiler.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include "tests.h"
+#include "debug.h"
+#include "machine.h"
+#include "event.h"
+#include "unwind.h"
+#include "perf_regs.h"
+#include "map.h"
+#include "thread.h"
+
+static int mmap_handler(struct perf_tool *tool __maybe_unused,
+                        union perf_event *event,
+                        struct perf_sample *sample __maybe_unused,
+                        struct machine *machine)
+{
+        return machine__process_mmap_event(machine, event, NULL);
+}
+
+static int init_live_machine(struct machine *machine)
+{
+        union perf_event event;
+        pid_t pid = getpid();
+
+        return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
+                                                  mmap_handler, machine, true);
+}
+
+#define MAX_STACK 6
+
+static int unwind_entry(struct unwind_entry *entry, void *arg)
+{
+        unsigned long *cnt = (unsigned long *) arg;
+        char *symbol = entry->sym ? entry->sym->name : NULL;
+        static const char *funcs[MAX_STACK] = {
+                "test__arch_unwind_sample",
+                "unwind_thread",
+                "krava_3",
+                "krava_2",
+                "krava_1",
+                "test__dwarf_unwind"
+        };
+
+        if (*cnt >= MAX_STACK) {
+                pr_debug("failed: crossed the max stack value %d\n", MAX_STACK);
+                return -1;
+        }
+
+        if (!symbol) {
+                pr_debug("failed: got unresolved address 0x%" PRIx64 "\n",
+                         entry->ip);
+                return -1;
+        }
+
+        pr_debug("got: %s 0x%" PRIx64 "\n", symbol, entry->ip);
+        return strcmp((const char *) symbol, funcs[(*cnt)++]);
+}
+
+__attribute__ ((noinline))
+static int unwind_thread(struct thread *thread, struct machine *machine)
+{
+        struct perf_sample sample;
+        unsigned long cnt = 0;
+        int err = -1;
+
+        memset(&sample, 0, sizeof(sample));
+
+        if (test__arch_unwind_sample(&sample, thread)) {
+                pr_debug("failed to get unwind sample\n");
+                goto out;
+        }
+
+        err = unwind__get_entries(unwind_entry, &cnt, machine, thread,
+                                  &sample, MAX_STACK);
+        if (err)
+                pr_debug("unwind failed\n");
+        else if (cnt != MAX_STACK) {
+                pr_debug("got wrong number of stack entries %lu != %d\n",
+                         cnt, MAX_STACK);
+                err = -1;
+        }
+
+ out:
+        free(sample.user_stack.data);
+        free(sample.user_regs.regs);
+        return err;
+}
+
+__attribute__ ((noinline))
+static int krava_3(struct thread *thread, struct machine *machine)
+{
+        return unwind_thread(thread, machine);
+}
+
+__attribute__ ((noinline))
+static int krava_2(struct thread *thread, struct machine *machine)
+{
+        return krava_3(thread, machine);
+}
+
+__attribute__ ((noinline))
+static int krava_1(struct thread *thread, struct machine *machine)
+{
+        return krava_2(thread, machine);
+}
+
+int test__dwarf_unwind(void)
+{
+        struct machines machines;
+        struct machine *machine;
+        struct thread *thread;
+        int err = -1;
+
+        machines__init(&machines);
+
+        machine = machines__find(&machines, HOST_KERNEL_ID);
+        if (!machine) {
+                pr_err("Could not get machine\n");
+                return -1;
+        }
+
+        if (init_live_machine(machine)) {
+                pr_err("Could not init machine\n");
+                goto out;
+        }
+
+        if (verbose > 1)
+                machine__fprintf(machine, stderr);
+
+        thread = machine__find_thread(machine, getpid(), getpid());
+        if (!thread) {
+                pr_err("Could not get thread\n");
+                goto out;
+        }
+
+        err = krava_1(thread, machine);
+
+ out:
+        machine__delete_threads(machine);
+        machine__exit(machine);
+        machines__exit(&machines);
+        return err;
+}