Merge commit 'v3.5-rc3' into x86/debug

Merge it in to pick up a fix that we are going to clean up in this
branch.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 76 insertions, 21 deletions

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 93d355d2710..2600916efa8 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -288,7 +288,8 @@ struct branch_info *machine__resolve_bstack(struct machine *self,
         return bi;
 }
 
-int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
+int machine__resolve_callchain(struct machine *self,
+                               struct perf_evsel *evsel __used,
                                struct thread *thread,
                                struct ip_callchain *chain,
                                struct symbol **parent)
@@ -297,7 +298,12 @@ int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
         unsigned int i;
         int err;
 
-        callchain_cursor_reset(&evsel->hists.callchain_cursor);
+        callchain_cursor_reset(&callchain_cursor);
+
+        if (chain->nr > PERF_MAX_STACK_DEPTH) {
+                pr_warning("corrupted callchain. skipping...\n");
+                return 0;
+        }
 
         for (i = 0; i < chain->nr; i++) {
                 u64 ip;
@@ -317,7 +323,14 @@ int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
                         case PERF_CONTEXT_USER:
                                 cpumode = PERF_RECORD_MISC_USER;        break;
                         default:
-                                break;
+                                pr_debug("invalid callchain context: "
+                                         "%"PRId64"\n", (s64) ip);
+                                /*
+                                 * It seems the callchain is corrupted.
+                                 * Discard all.
+                                 */
+                                callchain_cursor_reset(&callchain_cursor);
+                                return 0;
                         }
                         continue;
                 }
@@ -333,7 +346,7 @@ int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
                                 break;
                 }
 
-                err = callchain_cursor_append(&evsel->hists.callchain_cursor,
+                err = callchain_cursor_append(&callchain_cursor,
                                               ip, al.map, al.sym);
                 if (err)
                         return err;
@@ -441,37 +454,65 @@ void mem_bswap_64(void *src, int byte_size)
         }
 }
 
-static void perf_event__all64_swap(union perf_event *event)
+static void swap_sample_id_all(union perf_event *event, void *data)
+{
+        void *end = (void *) event + event->header.size;
+        int size = end - data;
+
+        BUG_ON(size % sizeof(u64));
+        mem_bswap_64(data, size);
+}
+
+static void perf_event__all64_swap(union perf_event *event,
+                                   bool sample_id_all __used)
 {
         struct perf_event_header *hdr = &event->header;
         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 }
 
-static void perf_event__comm_swap(union perf_event *event)
+static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
 {
         event->comm.pid = bswap_32(event->comm.pid);
         event->comm.tid = bswap_32(event->comm.tid);
+
+        if (sample_id_all) {
+                void *data = &event->comm.comm;
+
+                data += ALIGN(strlen(data) + 1, sizeof(u64));
+                swap_sample_id_all(event, data);
+        }
 }
 
-static void perf_event__mmap_swap(union perf_event *event)
+static void perf_event__mmap_swap(union perf_event *event,
+                                  bool sample_id_all)
 {
         event->mmap.pid   = bswap_32(event->mmap.pid);
         event->mmap.tid   = bswap_32(event->mmap.tid);
         event->mmap.start = bswap_64(event->mmap.start);
         event->mmap.len   = bswap_64(event->mmap.len);
         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
+
+        if (sample_id_all) {
+                void *data = &event->mmap.filename;
+
+                data += ALIGN(strlen(data) + 1, sizeof(u64));
+                swap_sample_id_all(event, data);
+        }
 }
 
-static void perf_event__task_swap(union perf_event *event)
+static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 {
         event->fork.pid  = bswap_32(event->fork.pid);
         event->fork.tid  = bswap_32(event->fork.tid);
         event->fork.ppid = bswap_32(event->fork.ppid);
         event->fork.ptid = bswap_32(event->fork.ptid);
         event->fork.time = bswap_64(event->fork.time);
+
+        if (sample_id_all)
+                swap_sample_id_all(event, &event->fork + 1);
 }
 
-static void perf_event__read_swap(union perf_event *event)
+static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 {
         event->read.pid          = bswap_32(event->read.pid);
         event->read.tid          = bswap_32(event->read.tid);
@@ -479,6 +520,9 @@ static void perf_event__read_swap(union perf_event *event)
         event->read.time_enabled = bswap_64(event->read.time_enabled);
         event->read.time_running = bswap_64(event->read.time_running);
         event->read.id           = bswap_64(event->read.id);
+
+        if (sample_id_all)
+                swap_sample_id_all(event, &event->read + 1);
 }
 
 static u8 revbyte(u8 b)
@@ -530,7 +574,8 @@ void perf_event__attr_swap(struct perf_event_attr *attr)
         swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64));
 }
 
-static void perf_event__hdr_attr_swap(union perf_event *event)
+static void perf_event__hdr_attr_swap(union perf_event *event,
+                                      bool sample_id_all __used)
 {
         size_t size;
 
@@ -541,18 +586,21 @@ static void perf_event__hdr_attr_swap(union perf_event *event)
         mem_bswap_64(event->attr.id, size);
 }
 
-static void perf_event__event_type_swap(union perf_event *event)
+static void perf_event__event_type_swap(union perf_event *event,
+                                        bool sample_id_all __used)
 {
         event->event_type.event_type.event_id =
                 bswap_64(event->event_type.event_type.event_id);
 }
 
-static void perf_event__tracing_data_swap(union perf_event *event)
+static void perf_event__tracing_data_swap(union perf_event *event,
+                                          bool sample_id_all __used)
 {
         event->tracing_data.size = bswap_32(event->tracing_data.size);
 }
 
-typedef void (*perf_event__swap_op)(union perf_event *event);
+typedef void (*perf_event__swap_op)(union perf_event *event,
+                                    bool sample_id_all);
 
 static perf_event__swap_op perf_event__swap_ops[] = {
         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
@@ -986,6 +1034,15 @@ static int perf_session__process_user_event(struct perf_session *session, union
         }
 }
 
+static void event_swap(union perf_event *event, bool sample_id_all)
+{
+        perf_event__swap_op swap;
+
+        swap = perf_event__swap_ops[event->header.type];
+        if (swap)
+                swap(event, sample_id_all);
+}
+
 static int perf_session__process_event(struct perf_session *session,
                                        union perf_event *event,
                                        struct perf_tool *tool,
@@ -994,9 +1051,8 @@ static int perf_session__process_event(struct perf_session *session,
         struct perf_sample sample;
         int ret;
 
-        if (session->header.needs_swap &&
-            perf_event__swap_ops[event->header.type])
-                perf_event__swap_ops[event->header.type](event);
+        if (session->header.needs_swap)
+                event_swap(event, session->sample_id_all);
 
         if (event->header.type >= PERF_RECORD_HEADER_MAX)
                 return -EINVAL;
@@ -1428,7 +1484,6 @@ void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
                           int print_sym, int print_dso, int print_symoffset)
 {
         struct addr_location al;
-        struct callchain_cursor *cursor = &evsel->hists.callchain_cursor;
         struct callchain_cursor_node *node;
 
         if (perf_event__preprocess_sample(event, machine, &al, sample,
@@ -1446,10 +1501,10 @@ void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
                                 error("Failed to resolve callchain. Skipping\n");
                         return;
                 }
-                callchain_cursor_commit(cursor);
+                callchain_cursor_commit(&callchain_cursor);
 
                 while (1) {
-                        node = callchain_cursor_current(cursor);
+                        node = callchain_cursor_current(&callchain_cursor);
                         if (!node)
                                 break;
 
@@ -1460,12 +1515,12 @@ void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
                         }
                         if (print_dso) {
                                 printf(" (");
-                                map__fprintf_dsoname(al.map, stdout);
+                                map__fprintf_dsoname(node->map, stdout);
                                 printf(")");
                         }
                         printf("\n");
 
-                        callchain_cursor_advance(cursor);
+                        callchain_cursor_advance(&callchain_cursor);
                 }
 
         } else {