page alloc wrapper: Fix get_pfnblock_flags_mask prototype

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

diff --git a/probes/lttng-ftrace.c b/probes/lttng-ftrace.c
deleted file mode 100644 (file)
index c866876..0000000
--- a/probes/lttng-ftrace.c
+++ /dev/null
@@ -1,174 +0,0 @@
-/*
- * (C) Copyright       2009-2011 -
- *             Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * LTTng function tracer integration module.
- *
- * Dual LGPL v2.1/GPL v2 license.
- */
-
-/*
- * Ftrace function tracer does not seem to provide synchronization between probe
- * teardown and callback execution. Therefore, we make this module permanently
- * loaded (unloadable).
- */
-
-#include <linux/module.h>
-#include <linux/ftrace.h>
-#include <linux/slab.h>
-#include "../ltt-events.h"
-#include "../wrapper/ringbuffer/frontend_types.h"
-#include "../wrapper/ftrace.h"
-#include "../wrapper/vmalloc.h"
-#include "../ltt-tracer.h"
-
-static
-void lttng_ftrace_handler(unsigned long ip, unsigned long parent_ip, void **data)
-{
-       struct ltt_event *event = *data;
-       struct ltt_channel *chan = event->chan;
-       struct lib_ring_buffer_ctx ctx;
-       struct {
-               unsigned long ip;
-               unsigned long parent_ip;
-       } payload;
-       int ret;
-
-       if (!ACCESS_ONCE(chan->session->active))
-               return;
-       lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL,
-                                sizeof(payload), ltt_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, ltt_alignof(payload));
-       chan->ops->event_write(&ctx, &payload, sizeof(payload));
-       chan->ops->event_commit(&ctx);
-       return;
-}
-
-/*
- * Create event description
- */
-static
-int lttng_create_ftrace_event(const char *name, struct ltt_event *event)
-{
-       struct lttng_event_field *fields;
-       struct lttng_event_desc *desc;
-       int ret;
-
-       desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
-       if (!desc)
-               return -ENOMEM;
-       desc->name = kstrdup(name, GFP_KERNEL);
-       if (!desc->name) {
-               ret = -ENOMEM;
-               goto error_str;
-       }
-       desc->nr_fields = 2;
-       desc->fields = fields =
-               kzalloc(2 * sizeof(struct lttng_event_field), GFP_KERNEL);
-       if (!desc->fields) {
-               ret = -ENOMEM;
-               goto error_fields;
-       }
-       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 = ltt_alignof(unsigned long) * CHAR_BIT;
-       fields[0].type.u.basic.integer.signedness = 0;
-       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].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 = ltt_alignof(unsigned long) * CHAR_BIT;
-       fields[1].type.u.basic.integer.signedness = 0;
-       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;
-
-       desc->owner = THIS_MODULE;
-       event->desc = desc;
-
-       return 0;
-
-error_fields:
-       kfree(desc->name);
-error_str:
-       kfree(desc);
-       return ret;
-}
-
-static
-struct ftrace_probe_ops lttng_ftrace_ops = {
-       .func = lttng_ftrace_handler,
-};
-
-int lttng_ftrace_register(const char *name,
-                         const char *symbol_name,
-                         struct ltt_event *event)
-{
-       int ret;
-
-       ret = lttng_create_ftrace_event(name, event);
-       if (ret)
-               goto error;
-
-       event->u.ftrace.symbol_name = kstrdup(symbol_name, GFP_KERNEL);
-       if (!event->u.ftrace.symbol_name)
-               goto name_error;
-
-       /* Ensure the memory we just allocated don't trigger page faults */
-       wrapper_vmalloc_sync_all();
-
-       ret = wrapper_register_ftrace_function_probe(event->u.ftrace.symbol_name,
-                       &lttng_ftrace_ops, event);
-       if (ret < 0)
-               goto register_error;
-       return 0;
-
-register_error:
-       kfree(event->u.ftrace.symbol_name);
-name_error:
-       kfree(event->desc->name);
-       kfree(event->desc);
-error:
-       return ret;
-}
-EXPORT_SYMBOL_GPL(lttng_ftrace_register);
-
-void lttng_ftrace_unregister(struct ltt_event *event)
-{
-       wrapper_unregister_ftrace_function_probe(event->u.ftrace.symbol_name,
-                       &lttng_ftrace_ops, event);
-       kfree(event->u.ftrace.symbol_name);
-       kfree(event->desc->fields);
-       kfree(event->desc->name);
-       kfree(event->desc);
-}
-EXPORT_SYMBOL_GPL(lttng_ftrace_unregister);
-
-int lttng_ftrace_init(void)
-{
-       wrapper_vmalloc_sync_all();
-       return 0;
-}
-module_init(lttng_ftrace_init)
-
-/*
- * Ftrace takes care of waiting for a grace period (RCU sched) at probe
- * unregistration, and disables preemption around probe call.
- */
-void lttng_ftrace_exit(void)
-{
-}
-module_exit(lttng_ftrace_exit)
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Linux Trace Toolkit Ftrace Support");