/*
- * (C) Copyright 2009-2011 -
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+* probes/lttng-kretprobes.c
*
* LTTng kretprobes integration module.
*
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/slab.h>
#include <linux/kref.h>
-#include "../lttng-events.h"
-#include "../wrapper/ringbuffer/frontend_types.h"
-#include "../wrapper/vmalloc.h"
-#include "../lttng-tracer.h"
+#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 {
EVENT_ENTRY = 0,
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;
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, <tng_probe_ctx, sizeof(payload),
lttng_alignof(payload), -1);
ret = chan->ops->event_reserve(&ctx, event->id);
if (ret < 0)
fields[0].type.atype = atype_integer;
fields[0].type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
fields[0].type.u.basic.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
- fields[0].type.u.basic.integer.signedness = is_signed_type(unsigned long);
+ fields[0].type.u.basic.integer.signedness = lttng_is_signed_type(unsigned long);
fields[0].type.u.basic.integer.reverse_byte_order = 0;
fields[0].type.u.basic.integer.base = 16;
fields[0].type.u.basic.integer.encoding = lttng_encode_none;
fields[1].type.atype = atype_integer;
fields[1].type.u.basic.integer.size = sizeof(unsigned long) * CHAR_BIT;
fields[1].type.u.basic.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
- fields[1].type.u.basic.integer.signedness = is_signed_type(unsigned long);
+ fields[1].type.u.basic.integer.signedness = lttng_is_signed_type(unsigned long);
fields[1].type.u.basic.integer.reverse_byte_order = 0;
fields[1].type.u.basic.integer.base = 16;
fields[1].type.u.basic.integer.encoding = lttng_encode_none;
* unregistered. Same for memory allocation.
*/
kref_init(<tng_krp->kref_alloc);
- kref_get(<tng_krp->kref_alloc); /* inc refcount to 2 */
+ kref_get(<tng_krp->kref_alloc); /* inc refcount to 2, no overflow. */
kref_init(<tng_krp->kref_register);
- kref_get(<tng_krp->kref_register); /* inc refcount to 2 */
+ kref_get(<tng_krp->kref_register); /* inc refcount to 2, no overflow. */
/*
* Ensure the memory we just allocated don't trigger page faults.
}
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);