Implement event notifiers for uprobes

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

diff --git a/src/lttng-events.c b/src/lttng-events.c
index 0e11c5d86fce094ea0ce31c0c9c46f3e3cb11be8..379a7e7e1d4a39a3a574514cbd6c0b5881e88292 100644 (file)
--- a/src/lttng-events.c
+++ b/src/lttng-events.c
@@ -615,11 +615,11 @@ int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier)
                ret = -EINVAL;
                break;
        case LTTNG_KERNEL_KPROBE:
+       case LTTNG_KERNEL_UPROBE:
                WRITE_ONCE(event_notifier->enabled, 1);
                break;
        case LTTNG_KERNEL_SYSCALL:
        case LTTNG_KERNEL_FUNCTION:
-       case LTTNG_KERNEL_UPROBE:
        case LTTNG_KERNEL_NOOP:
        case LTTNG_KERNEL_KRETPROBE:
        default:
@@ -645,11 +645,11 @@ int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier)
                ret = -EINVAL;
                break;
        case LTTNG_KERNEL_KPROBE:
+       case LTTNG_KERNEL_UPROBE:
                WRITE_ONCE(event_notifier->enabled, 0);
                break;
        case LTTNG_KERNEL_SYSCALL:
        case LTTNG_KERNEL_FUNCTION:
-       case LTTNG_KERNEL_UPROBE:
        case LTTNG_KERNEL_NOOP:
        case LTTNG_KERNEL_KRETPROBE:
        default:
@@ -1008,9 +1008,9 @@ struct lttng_event_notifier *_lttng_event_notifier_create(
                event_name = event_desc->name;
                break;
        case LTTNG_KERNEL_KPROBE:
+       case LTTNG_KERNEL_UPROBE:
                event_name = event_notifier_param->event.name;
                break;
-       case LTTNG_KERNEL_UPROBE:
        case LTTNG_KERNEL_KRETPROBE:
        case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_NOOP:
@@ -1087,6 +1087,28 @@ struct lttng_event_notifier *_lttng_event_notifier_create(
                WARN_ON_ONCE(!ret);
                break;
        case LTTNG_KERNEL_UPROBE:
+               /*
+                * Needs to be explicitly enabled after creation, since
+                * we may want to apply filters.
+                */
+               event_notifier->enabled = 0;
+               event_notifier->registered = 1;
+
+               /*
+                * Populate lttng_event_notifier structure before
+                * event_notifier registration.
+                */
+               smp_wmb();
+
+               ret = lttng_uprobes_register_event_notifier(
+                               event_notifier_param->event.name,
+                               event_notifier_param->event.u.uprobe.fd,
+                               event_notifier);
+               if (ret)
+                       goto register_error;
+               ret = try_module_get(event_notifier->desc->owner);
+               WARN_ON_ONCE(!ret);
+               break;
        case LTTNG_KERNEL_KRETPROBE:
        case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_NOOP:
@@ -1236,10 +1258,10 @@ void register_event_notifier(struct lttng_event_notifier *event_notifier)
                                                  event_notifier);
                break;
        case LTTNG_KERNEL_KPROBE:
+       case LTTNG_KERNEL_UPROBE:
                ret = 0;
                break;
        case LTTNG_KERNEL_SYSCALL:
-       case LTTNG_KERNEL_UPROBE:
        case LTTNG_KERNEL_KRETPROBE:
        case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_NOOP:
@@ -1271,11 +1293,14 @@ int _lttng_event_notifier_unregister(
                lttng_kprobes_unregister_event_notifier(event_notifier);
                ret = 0;
                break;
+       case LTTNG_KERNEL_UPROBE:
+               lttng_uprobes_unregister_event_notifier(event_notifier);
+               ret = 0;
+               break;
        case LTTNG_KERNEL_KRETPROBE:
        case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_SYSCALL:
        case LTTNG_KERNEL_NOOP:
-       case LTTNG_KERNEL_UPROBE:
        default:
                WARN_ON_ONCE(1);
        }
@@ -1332,11 +1357,14 @@ void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier)
                module_put(event_notifier->desc->owner);
                lttng_kprobes_destroy_event_notifier_private(event_notifier);
                break;
+       case LTTNG_KERNEL_UPROBE:
+               module_put(event_notifier->desc->owner);
+               lttng_uprobes_destroy_event_notifier_private(event_notifier);
+               break;
        case LTTNG_KERNEL_KRETPROBE:
        case LTTNG_KERNEL_FUNCTION:
        case LTTNG_KERNEL_NOOP:
        case LTTNG_KERNEL_SYSCALL:
-       case LTTNG_KERNEL_UPROBE:
        default:
                WARN_ON_ONCE(1);
        }
@@ -2270,6 +2298,19 @@ error:
        return ret;
 }
 
+int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
+               struct lttng_kernel_event_callsite __user *callsite)
+{
+
+       switch (event_notifier->instrumentation) {
+       case LTTNG_KERNEL_UPROBE:
+               return lttng_uprobes_event_notifier_add_callsite(event_notifier,
+                               callsite);
+       default:
+               return -EINVAL;
+       }
+}
+
 int lttng_event_notifier_enabler_attach_context(
                struct lttng_event_notifier_enabler *event_notifier_enabler,
                struct lttng_kernel_context *context_param)