Contexts for RT debugging

[lttng-modules.git] / probes / lttng-kretprobes.c

diff --git a/probes/lttng-kretprobes.c b/probes/lttng-kretprobes.c
index 6b5e046f4cf363aa6d64279b4b7443178bd74d76..eb3f68573dc895554af4484d0a8aad03ddcf284a 100644 (file)
--- a/probes/lttng-kretprobes.c
+++ b/probes/lttng-kretprobes.c
@@ -27,6 +27,7 @@
 #include "../lttng-events.h"
 #include "../wrapper/ringbuffer/frontend_types.h"
 #include "../wrapper/vmalloc.h"
+#include "../wrapper/irqflags.h"
 #include "../lttng-tracer.h"
 
 enum lttng_kretprobe_type {
@@ -50,6 +51,10 @@ int _lttng_kretprobes_handler(struct kretprobe_instance *krpi,
                container_of(krpi->rp, struct lttng_krp, krp);
        struct lttng_event *event =
                lttng_krp->event[type];
+       struct lttng_probe_ctx lttng_probe_ctx = {
+               .event = event,
+               .interruptible = lttng_regs_irqs_disabled(regs),
+       };
        struct lttng_channel *chan = event->chan;
        struct lib_ring_buffer_ctx ctx;
        int ret;
@@ -68,7 +73,7 @@ int _lttng_kretprobes_handler(struct kretprobe_instance *krpi,
        payload.ip = (unsigned long) krpi->rp->kp.addr;
        payload.parent_ip = (unsigned long) krpi->ret_addr;
 
-       lib_ring_buffer_ctx_init(&ctx, chan->chan, event, sizeof(payload),
+       lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx, sizeof(payload),
                                 lttng_alignof(payload), -1);
        ret = chan->ops->event_reserve(&ctx, event->id);
        if (ret < 0)
@@ -285,6 +290,30 @@ void lttng_kretprobes_destroy_private(struct lttng_event *event)
 }
 EXPORT_SYMBOL_GPL(lttng_kretprobes_destroy_private);
 
+int lttng_kretprobes_event_enable_state(struct lttng_event *event,
+               int enable)
+{
+       struct lttng_event *event_return;
+       struct lttng_krp *lttng_krp;
+
+       if (event->instrumentation != LTTNG_KERNEL_KRETPROBE) {
+               return -EINVAL;
+       }
+       if (event->enabled == enable) {
+               return -EBUSY;
+       }
+       lttng_krp = event->u.kretprobe.lttng_krp;
+       event_return = lttng_krp->event[EVENT_RETURN];
+       ACCESS_ONCE(event->enabled) = enable;
+       ACCESS_ONCE(event_return->enabled) = enable;
+       return 0;
+}
+EXPORT_SYMBOL_GPL(lttng_kretprobes_event_enable_state);
+
 MODULE_LICENSE("GPL and additional rights");
 MODULE_AUTHOR("Mathieu Desnoyers");
 MODULE_DESCRIPTION("Linux Trace Toolkit Kretprobes Support");
+MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
+       __stringify(LTTNG_MODULES_MINOR_VERSION) "."
+       __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
+       LTTNG_MODULES_EXTRAVERSION);