-/*
+/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
+ *
* probes/lttng-kretprobes.c
*
* LTTng kretprobes integration module.
*
* 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 <ringbuffer/frontend_types.h>
+#include <wrapper/vmalloc.h>
+#include <wrapper/irqflags.h>
+#include <lttng-tracer.h>
+#include <blacklist/kprobes.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;
unsigned long parent_ip;
} payload;
- if (unlikely(!ACCESS_ONCE(chan->session->active)))
+ if (unlikely(!READ_ONCE(chan->session->active)))
return 0;
- if (unlikely(!ACCESS_ONCE(chan->enabled)))
+ if (unlikely(!READ_ONCE(chan->enabled)))
return 0;
- if (unlikely(!ACCESS_ONCE(event->enabled)))
+ if (unlikely(!READ_ONCE(event->enabled)))
return 0;
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].name = "ip";
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.reverse_byte_order = 0;
- fields[0].type.u.basic.integer.base = 16;
- fields[0].type.u.basic.integer.encoding = lttng_encode_none;
+ fields[0].type.u.integer.size = sizeof(unsigned long) * CHAR_BIT;
+ fields[0].type.u.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
+ fields[0].type.u.integer.signedness = lttng_is_signed_type(unsigned long);
+ fields[0].type.u.integer.reverse_byte_order = 0;
+ fields[0].type.u.integer.base = 16;
+ fields[0].type.u.integer.encoding = lttng_encode_none;
fields[1].name = "parent_ip";
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.reverse_byte_order = 0;
- fields[1].type.u.basic.integer.base = 16;
- fields[1].type.u.basic.integer.encoding = lttng_encode_none;
+ fields[1].type.u.integer.size = sizeof(unsigned long) * CHAR_BIT;
+ fields[1].type.u.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
+ fields[1].type.u.integer.signedness = lttng_is_signed_type(unsigned long);
+ fields[1].type.u.integer.reverse_byte_order = 0;
+ fields[1].type.u.integer.base = 16;
+ fields[1].type.u.integer.encoding = lttng_encode_none;
desc->owner = THIS_MODULE;
event->desc = desc;
* 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.
* Well.. kprobes itself puts the page fault handler on the blacklist,
* but we can never be too careful.
*/
- wrapper_vmalloc_sync_all();
+ wrapper_vmalloc_sync_mappings();
ret = register_kretprobe(<tng_krp->krp);
if (ret)
}
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];
+ WRITE_ONCE(event->enabled, enable);
+ WRITE_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_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
+MODULE_DESCRIPTION("LTTng kretprobes probes");
+MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
+ __stringify(LTTNG_MODULES_MINOR_VERSION) "."
+ __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
+ LTTNG_MODULES_EXTRAVERSION);
projects / lttng-modules.git / blobdiff