-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* probes/lttng-ftrace.c
*
* LTTng function tracer 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 <wrapper/vmalloc.h>
#include <lttng-tracer.h>
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
+static
+void lttng_ftrace_handler(unsigned long ip, unsigned long parent_ip,
+ struct trace_array *tr, struct ftrace_probe_ops *ops,
+ void *data)
+{
+ struct lttng_event *event = data;
+ struct lttng_probe_ctx lttng_probe_ctx = {
+ .event = event,
+ .interruptible = !irqs_disabled(),
+ };
+ struct lttng_channel *chan = event->chan;
+ struct lib_ring_buffer_ctx ctx;
+ struct {
+ unsigned long ip;
+ unsigned long parent_ip;
+ } payload;
+ int ret;
+
+ if (unlikely(!READ_ONCE(chan->session->active)))
+ return;
+ if (unlikely(!READ_ONCE(chan->enabled)))
+ return;
+ if (unlikely(!READ_ONCE(event->enabled)))
+ return;
+
+ 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)
+ return;
+ payload.ip = ip;
+ payload.parent_ip = parent_ip;
+ lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
+ chan->ops->event_write(&ctx, &payload, sizeof(payload));
+ chan->ops->event_commit(&ctx);
+ return;
+}
+#else
static
void lttng_ftrace_handler(unsigned long ip, unsigned long parent_ip, void **data)
{
} payload;
int ret;
- if (unlikely(!ACCESS_ONCE(chan->session->active)))
+ if (unlikely(!READ_ONCE(chan->session->active)))
return;
- if (unlikely(!ACCESS_ONCE(chan->enabled)))
+ if (unlikely(!READ_ONCE(chan->enabled)))
return;
- if (unlikely(!ACCESS_ONCE(event->enabled)))
+ if (unlikely(!READ_ONCE(event->enabled)))
return;
lib_ring_buffer_ctx_init(&ctx, chan->chan, <tng_probe_ctx,
chan->ops->event_commit(&ctx);
return;
}
+#endif
/*
* Create event description
module_exit(lttng_ftrace_exit)
MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Ftrace Support");
+MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
+MODULE_DESCRIPTION("LTTng ftrace probes");
MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
__stringify(LTTNG_MODULES_MINOR_VERSION) "."
__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)