Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / tools / perf / tests / dwarf-unwind.c

diff --git a/kernel/tools/perf/tests/dwarf-unwind.c b/kernel/tools/perf/tests/dwarf-unwind.c
new file mode 100644 (file)
index 0000000..0bf06be
--- /dev/null
+++ b/kernel/tools/perf/tests/dwarf-unwind.c
@@ -0,0 +1,179 @@
+#include <linux/compiler.h>
+#include <linux/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"
+#include "callchain.h"
+
+/* For bsearch. We try to unwind functions in shared object. */
+#include <stdlib.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_mmap2_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 8
+
+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",
+               "compare",
+               "bsearch",
+               "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 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, 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;
+}
+
+static int global_unwind_retval = -INT_MAX;
+
+__attribute__ ((noinline))
+static int compare(void *p1, void *p2)
+{
+       /* Any possible value should be 'thread' */
+       struct thread *thread = *(struct thread **)p1;
+
+       if (global_unwind_retval == -INT_MAX)
+               global_unwind_retval = unwind_thread(thread);
+
+       return p1 - p2;
+}
+
+__attribute__ ((noinline))
+static int krava_3(struct thread *thread)
+{
+       struct thread *array[2] = {thread, thread};
+       void *fp = &bsearch;
+       /*
+        * make _bsearch a volatile function pointer to
+        * prevent potential optimization, which may expand
+        * bsearch and call compare directly from this function,
+        * instead of libc shared object.
+        */
+       void *(*volatile _bsearch)(void *, void *, size_t,
+                       size_t, int (*)(void *, void *));
+
+       _bsearch = fp;
+       _bsearch(array, &thread, 2, sizeof(struct thread **), compare);
+       return global_unwind_retval;
+}
+
+__attribute__ ((noinline))
+static int krava_2(struct thread *thread)
+{
+       return krava_3(thread);
+}
+
+__attribute__ ((noinline))
+static int krava_1(struct thread *thread)
+{
+       return krava_2(thread);
+}
+
+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;
+       }
+
+       callchain_param.record_mode = CALLCHAIN_DWARF;
+
+       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);
+
+ out:
+       machine__delete_threads(machine);
+       machine__exit(machine);
+       machines__exit(&machines);
+       return err;
+}