*
*/
-#include <linux/fdtable.h>
+#include <wrapper/fdtable.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/namei.h>
return 0;
}
+static
+int lttng_uprobes_event_notifier_handler_pre(struct uprobe_consumer *uc, struct pt_regs *regs)
+{
+ struct lttng_uprobe_handler *uprobe_handler =
+ container_of(uc, struct lttng_uprobe_handler, up_consumer);
+ struct lttng_event_notifier *event_notifier = uprobe_handler->u.event_notifier;
+ struct lttng_kernel_notifier_ctx notif_ctx;
+
+ if (unlikely(!READ_ONCE(event_notifier->enabled)))
+ return 0;
+
+ notif_ctx.eval_capture = LTTNG_READ_ONCE(event_notifier->eval_capture);
+ event_notifier->send_notification(event_notifier, NULL, NULL, ¬if_ctx);
+ return 0;
+}
+
+static const struct lttng_kernel_type_common *event_type =
+ lttng_kernel_static_type_integer_from_type(unsigned long, __BYTE_ORDER, 16);
+
/*
* Create event description.
*/
static
int lttng_create_uprobe_event(const char *name, struct lttng_event *event)
{
- struct lttng_event_desc *desc;
- struct lttng_event_field *fields;
+ const struct lttng_kernel_event_field **fieldp_array;
+ struct lttng_kernel_event_field *field;
+ struct lttng_kernel_event_desc *desc;
int ret;
- desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
+ desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
- desc->name = kstrdup(name, GFP_KERNEL);
- if (!desc->name) {
+ desc->event_name = kstrdup(name, GFP_KERNEL);
+ if (!desc->event_name) {
ret = -ENOMEM;
goto error_str;
}
-
desc->nr_fields = 1;
- desc->fields = fields =
- kzalloc(1 * sizeof(struct lttng_event_field), GFP_KERNEL);
+ fieldp_array = kzalloc(1 * sizeof(struct lttng_kernel_event_field *), GFP_KERNEL);
+ if (!fieldp_array) {
+ ret = -ENOMEM;
+ goto error_fieldp_array;
+ }
+ desc->fields = fieldp_array;
+ desc->fields[0] = field =
+ kzalloc(sizeof(struct lttng_kernel_event_field), GFP_KERNEL);
+ if (!field) {
+ ret = -ENOMEM;
+ goto error_field;
+ }
+ field->name = "ip";
+ field->type = event_type;
+ desc->owner = THIS_MODULE;
+ event->desc = desc;
- if (!desc->fields) {
+ return 0;
+
+error_field:
+ kfree(fieldp_array);
+error_fieldp_array:
+ kfree(desc->event_name);
+error_str:
+ kfree(desc);
+ return ret;
+}
+
+/*
+ * Create event_notifier description.
+ */
+static
+int lttng_create_uprobe_event_notifier(const char *name, struct lttng_event_notifier *event_notifier)
+{
+ struct lttng_kernel_event_desc *desc;
+ int ret;
+
+ desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+ desc->event_name = kstrdup(name, GFP_KERNEL);
+ if (!desc->event_name) {
ret = -ENOMEM;
- goto error_fields;
+ goto error_str;
}
- fields[0].name = "ip";
- fields[0].type.atype = atype_integer;
- 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;
+
+ desc->nr_fields = 0;
desc->owner = THIS_MODULE;
- event->desc = desc;
+ event_notifier->desc = desc;
return 0;
-error_fields:
- kfree(desc->name);
error_str:
kfree(desc);
return ret;
* Returns the file backing the given fd. Needs to be done inside an RCU
* critical section.
*/
- file = fcheck(fd);
+ file = lttng_lookup_fd_rcu(fd);
if (file == NULL) {
printk(KERN_WARNING "LTTng: Cannot access file backing the fd(%d)\n", fd);
inode = NULL;
goto end;
}
- /* Ensure the memory we just allocated don't trigger page faults. */
+ /* Ensure the memory we just allocated don't notify page faults. */
wrapper_vmalloc_sync_mappings();
uprobe_handler->u.event = priv_data;
}
EXPORT_SYMBOL_GPL(lttng_uprobes_event_add_callsite);
+int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
+ struct lttng_kernel_event_callsite __user *callsite)
+{
+ return lttng_uprobes_add_callsite(&event_notifier->u.uprobe, callsite,
+ lttng_uprobes_event_notifier_handler_pre, event_notifier);
+}
+EXPORT_SYMBOL_GPL(lttng_uprobes_event_notifier_add_callsite);
+
static
int lttng_uprobes_register(struct lttng_uprobe *uprobe, int fd)
{
return 0;
register_error:
- kfree(event->desc->name);
+ kfree(event->desc->event_name);
kfree(event->desc);
error:
return ret;
}
EXPORT_SYMBOL_GPL(lttng_uprobes_register_event);
-void lttng_uprobes_unregister_event(struct lttng_event *event)
+int lttng_uprobes_register_event_notifier(const char *name, int fd,
+ struct lttng_event_notifier *event_notifier)
+{
+ int ret = 0;
+
+ ret = lttng_create_uprobe_event_notifier(name, event_notifier);
+ if (ret)
+ goto error;
+
+ ret = lttng_uprobes_register(&event_notifier->u.uprobe, fd);
+ if (ret)
+ goto register_error;
+
+ return 0;
+
+register_error:
+ kfree(event_notifier->desc->event_name);
+ kfree(event_notifier->desc);
+error:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(lttng_uprobes_register_event_notifier);
+
+static
+void lttng_uprobes_unregister(struct inode *inode, struct list_head *head)
{
struct lttng_uprobe_handler *iter, *tmp;
* Iterate over the list of handler, remove each handler from the list
* and free the struct.
*/
- list_for_each_entry_safe(iter, tmp, &event->u.uprobe.head, node) {
- wrapper_uprobe_unregister(event->u.uprobe.inode, iter->offset,
- &iter->up_consumer);
+ list_for_each_entry_safe(iter, tmp, head, node) {
+ wrapper_uprobe_unregister(inode, iter->offset, &iter->up_consumer);
list_del(&iter->node);
kfree(iter);
}
+
+}
+
+void lttng_uprobes_unregister_event(struct lttng_event *event)
+{
+ lttng_uprobes_unregister(event->u.uprobe.inode, &event->u.uprobe.head);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event);
+void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+ lttng_uprobes_unregister(event_notifier->u.uprobe.inode, &event_notifier->u.uprobe.head);
+}
+EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event_notifier);
+
void lttng_uprobes_destroy_event_private(struct lttng_event *event)
{
iput(event->u.uprobe.inode);
- kfree(event->desc->name);
+ kfree(event->desc->fields[0]);
+ kfree(event->desc->fields);
+ kfree(event->desc->event_name);
kfree(event->desc);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_private);
+void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
+{
+ iput(event_notifier->u.uprobe.inode);
+ kfree(event_notifier->desc->event_name);
+ kfree(event_notifier->desc);
+}
+EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_notifier_private);
+
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Yannick Brosseau");
MODULE_DESCRIPTION("Linux Trace Toolkit Uprobes Support");
projects / lttng-modules.git / blobdiff