Version 2.11.3

[lttng-modules.git] / lttng-events.c

diff --git a/lttng-events.c b/lttng-events.c
index 0d62f9fb0ae4da6d651008d0e792895accceaa7d..831f0aef80051a2b537e3f7f56aa2c123e4d68a1 100644 (file)
--- a/lttng-events.c
+++ b/lttng-events.c
@@ -43,6 +43,7 @@
 #include <wrapper/vzalloc.h>
 #include <wrapper/ringbuffer/backend.h>
 #include <wrapper/ringbuffer/frontend.h>
+#include <wrapper/time.h>
 
 #define METADATA_CACHE_DEFAULT_SIZE 4096
 
@@ -399,7 +400,6 @@ int lttng_event_enable(struct lttng_event *event)
                ret = -EINVAL;
                break;
        case LTTNG_KERNEL_KPROBE:
-       case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_UPROBE:
        case LTTNG_KERNEL_NOOP:
                WRITE_ONCE(event->enabled, 1);
@@ -407,6 +407,7 @@ int lttng_event_enable(struct lttng_event *event)
        case LTTNG_KERNEL_KRETPROBE:
                ret = lttng_kretprobes_event_enable_state(event, 1);
                break;
+       case LTTNG_KERNEL_FUNCTION:     /* Fall-through. */
        default:
                WARN_ON_ONCE(1);
                ret = -EINVAL;
@@ -435,7 +436,6 @@ int lttng_event_disable(struct lttng_event *event)
                ret = -EINVAL;
                break;
        case LTTNG_KERNEL_KPROBE:
-       case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_UPROBE:
        case LTTNG_KERNEL_NOOP:
                WRITE_ONCE(event->enabled, 0);
@@ -443,6 +443,7 @@ int lttng_event_disable(struct lttng_event *event)
        case LTTNG_KERNEL_KRETPROBE:
                ret = lttng_kretprobes_event_enable_state(event, 0);
                break;
+       case LTTNG_KERNEL_FUNCTION:     /* Fall-through. */
        default:
                WARN_ON_ONCE(1);
                ret = -EINVAL;
@@ -585,11 +586,11 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
        case LTTNG_KERNEL_KPROBE:
        case LTTNG_KERNEL_UPROBE:
        case LTTNG_KERNEL_KRETPROBE:
-       case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_NOOP:
        case LTTNG_KERNEL_SYSCALL:
                event_name = event_param->name;
                break;
+       case LTTNG_KERNEL_FUNCTION:     /* Fall-through. */
        default:
                WARN_ON_ONCE(1);
                ret = -EINVAL;
@@ -712,27 +713,6 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
                list_add(&event_return->list, &chan->session->events);
                break;
        }
-       case LTTNG_KERNEL_FUNCTION:
-               /*
-                * Needs to be explicitly enabled after creation, since
-                * we may want to apply filters.
-                */
-               event->enabled = 0;
-               event->registered = 1;
-               /*
-                * Populate lttng_event structure before event
-                * registration.
-                */
-               smp_wmb();
-               ret = lttng_ftrace_register(event_name,
-                               event_param->u.ftrace.symbol_name,
-                               event);
-               if (ret) {
-                       goto register_error;
-               }
-               ret = try_module_get(event->desc->owner);
-               WARN_ON_ONCE(!ret);
-               break;
        case LTTNG_KERNEL_NOOP:
        case LTTNG_KERNEL_SYSCALL:
                /*
@@ -769,6 +749,7 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
                ret = try_module_get(event->desc->owner);
                WARN_ON_ONCE(!ret);
                break;
+       case LTTNG_KERNEL_FUNCTION:     /* Fall-through */
        default:
                WARN_ON_ONCE(1);
                ret = -EINVAL;
@@ -833,10 +814,10 @@ void register_event(struct lttng_event *event)
        case LTTNG_KERNEL_KPROBE:
        case LTTNG_KERNEL_UPROBE:
        case LTTNG_KERNEL_KRETPROBE:
-       case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_NOOP:
                ret = 0;
                break;
+       case LTTNG_KERNEL_FUNCTION:     /* Fall-through */
        default:
                WARN_ON_ONCE(1);
        }
@@ -870,10 +851,6 @@ int _lttng_event_unregister(struct lttng_event *event)
                lttng_kretprobes_unregister(event);
                ret = 0;
                break;
-       case LTTNG_KERNEL_FUNCTION:
-               lttng_ftrace_unregister(event);
-               ret = 0;
-               break;
        case LTTNG_KERNEL_SYSCALL:
                ret = lttng_syscall_filter_disable(event->chan,
                        desc->name);
@@ -885,6 +862,7 @@ int _lttng_event_unregister(struct lttng_event *event)
                lttng_uprobes_unregister(event);
                ret = 0;
                break;
+       case LTTNG_KERNEL_FUNCTION:     /* Fall-through */
        default:
                WARN_ON_ONCE(1);
        }
@@ -911,10 +889,6 @@ void _lttng_event_destroy(struct lttng_event *event)
                module_put(event->desc->owner);
                lttng_kretprobes_destroy_private(event);
                break;
-       case LTTNG_KERNEL_FUNCTION:
-               module_put(event->desc->owner);
-               lttng_ftrace_destroy_private(event);
-               break;
        case LTTNG_KERNEL_NOOP:
        case LTTNG_KERNEL_SYSCALL:
                break;
@@ -922,6 +896,7 @@ void _lttng_event_destroy(struct lttng_event *event)
                module_put(event->desc->owner);
                lttng_uprobes_destroy_private(event);
                break;
+       case LTTNG_KERNEL_FUNCTION:     /* Fall-through */
        default:
                WARN_ON_ONCE(1);
        }
@@ -2448,6 +2423,9 @@ int _lttng_event_header_declare(struct lttng_session *session)
  * in future versions.
  * This function may return a negative offset. It may happen if the
  * system sets the REALTIME clock to 0 after boot.
+ *
+ * Use 64bit timespec on kernels that have it, this makes 32bit arch
+ * y2038 compliant.
  */
 static
 int64_t measure_clock_offset(void)
@@ -2455,13 +2433,21 @@ int64_t measure_clock_offset(void)
        uint64_t monotonic_avg, monotonic[2], realtime;
        uint64_t tcf = trace_clock_freq();
        int64_t offset;
-       struct timespec rts = { 0, 0 };
        unsigned long flags;
+#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
+       struct timespec64 rts = { 0, 0 };
+#else
+       struct timespec rts = { 0, 0 };
+#endif
 
        /* Disable interrupts to increase correlation precision. */
        local_irq_save(flags);
        monotonic[0] = trace_clock_read64();
+#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
+       ktime_get_real_ts64(&rts);
+#else
        getnstimeofday(&rts);
+#endif
        monotonic[1] = trace_clock_read64();
        local_irq_restore(flags);
 
@@ -2479,6 +2465,61 @@ int64_t measure_clock_offset(void)
        return offset;
 }
 
+static
+int print_escaped_ctf_string(struct lttng_session *session, const char *string)
+{
+       int ret;
+       size_t i;
+       char cur;
+
+       i = 0;
+       cur = string[i];
+       while (cur != '\0') {
+               switch (cur) {
+               case '\n':
+                       ret = lttng_metadata_printf(session, "%s", "\\n");
+                       break;
+               case '\\':
+               case '"':
+                       ret = lttng_metadata_printf(session, "%c", '\\');
+                       if (ret)
+                               goto error;
+                       /* We still print the current char */
+                       /* Fallthrough */
+               default:
+                       ret = lttng_metadata_printf(session, "%c", cur);
+                       break;
+               }
+
+               if (ret)
+                       goto error;
+
+               cur = string[++i];
+       }
+error:
+       return ret;
+}
+
+static
+int print_metadata_escaped_field(struct lttng_session *session, const char *field,
+               const char *field_value)
+{
+       int ret;
+
+       ret = lttng_metadata_printf(session, "  %s = \"", field);
+       if (ret)
+               goto error;
+
+       ret = print_escaped_ctf_string(session, field_value);
+       if (ret)
+               goto error;
+
+       ret = lttng_metadata_printf(session, "\";\n");
+
+error:
+       return ret;
+}
+
 /*
  * Output metadata into this session's metadata buffers.
  * Must be called with sessions_mutex held.
@@ -2554,7 +2595,7 @@ int _lttng_session_metadata_statedump(struct lttng_session *session)
                "       tracer_major = %d;\n"
                "       tracer_minor = %d;\n"
                "       tracer_patchlevel = %d;\n"
-               "};\n\n",
+               "       trace_buffering_scheme = \"global\";\n",
                current->nsproxy->uts_ns->name.nodename,
                utsname()->sysname,
                utsname()->release,
@@ -2566,6 +2607,19 @@ int _lttng_session_metadata_statedump(struct lttng_session *session)
        if (ret)
                goto end;
 
+       ret = print_metadata_escaped_field(session, "trace_name", session->name);
+       if (ret)
+               goto end;
+       ret = print_metadata_escaped_field(session, "trace_creation_datetime",
+                       session->creation_time);
+       if (ret)
+               goto end;
+
+       /* Close env */
+       ret = lttng_metadata_printf(session, "};\n\n");
+       if (ret)
+               goto end;
+
        ret = lttng_metadata_printf(session,
                "clock {\n"
                "       name = \"%s\";\n",