#include <wrapper/vmalloc.h>
static
-int lttng_uprobes_handler_pre(struct uprobe_consumer *uc, struct pt_regs *regs)
+int lttng_uprobes_event_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 *event = uprobe_handler->event;
+ struct lttng_event *event = uprobe_handler->u.event;
struct lttng_probe_ctx lttng_probe_ctx = {
.event = event,
.interruptible = !lttng_regs_irqs_disabled(regs),
unsigned long ip;
} payload;
- if (unlikely(!READ_ONCE(chan->session->active)))
+ if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
return 0;
- if (unlikely(!READ_ONCE(chan->enabled)))
+ if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
return 0;
- if (unlikely(!READ_ONCE(event->enabled)))
+ if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
return 0;
lib_ring_buffer_ctx_init(&ctx, chan->chan, <tng_probe_ctx,
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;
+
+ if (unlikely(!READ_ONCE(event_notifier->enabled)))
+ return 0;
+
+ event_notifier->send_notification(event_notifier, NULL, NULL);
+ return 0;
+}
+
/*
* Create event description.
*/
return ret;
}
+/*
+ * Create event_notifier description.
+ */
+static
+int lttng_create_uprobe_event_notifier(const char *name, struct lttng_event_notifier *event_notifier)
+{
+ struct lttng_event_desc *desc;
+ int ret;
+
+ desc = kzalloc(sizeof(*event_notifier->desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+ desc->name = kstrdup(name, GFP_KERNEL);
+ if (!desc->name) {
+ ret = -ENOMEM;
+ goto error_str;
+ }
+
+ desc->nr_fields = 0;
+
+ desc->owner = THIS_MODULE;
+ event_notifier->desc = desc;
+
+ return 0;
+
+error_str:
+ kfree(desc);
+ return ret;
+}
+
/*
* Returns the inode struct from the current task and an fd. The inode is
* grabbed by this function and must be put once we are done with it using
*/
file = fcheck(fd);
if (file == NULL) {
- printk(KERN_WARNING "Cannot access file backing the fd(%d)\n", fd);
+ printk(KERN_WARNING "LTTng: Cannot access file backing the fd(%d)\n", fd);
inode = NULL;
goto error;
}
/* Grab a reference on the inode. */
inode = igrab(file->f_path.dentry->d_inode);
if (inode == NULL)
- printk(KERN_WARNING "Cannot grab a reference on the inode.\n");
+ printk(KERN_WARNING "LTTng: Cannot grab a reference on the inode.\n");
error:
rcu_read_unlock();
return inode;
}
-int lttng_uprobes_add_callsite(struct lttng_event *event,
- struct lttng_kernel_event_callsite __user *callsite)
+
+static
+int lttng_uprobes_add_callsite(struct lttng_uprobe *uprobe,
+ struct lttng_kernel_event_callsite __user *callsite,
+ int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs),
+ void *priv_data)
{
int ret = 0;
struct lttng_uprobe_handler *uprobe_handler;
- if (!event) {
+ if (!priv_data) {
ret = -EINVAL;
goto end;
}
uprobe_handler = kzalloc(sizeof(struct lttng_uprobe_handler), GFP_KERNEL);
if (!uprobe_handler) {
- printk(KERN_WARNING "Error allocating uprobe_uprobe_handlers");
+ printk(KERN_WARNING "LTTng: Error allocating uprobe_handler");
ret = -ENOMEM;
goto end;
}
- /* Ensure the memory we just allocated don't trigger page faults. */
+ /* Ensure the memory we just allocated don't event_notifier page faults. */
wrapper_vmalloc_sync_mappings();
- uprobe_handler->event = event;
- uprobe_handler->up_consumer.handler = lttng_uprobes_handler_pre;
+ uprobe_handler->u.event = priv_data;
+ uprobe_handler->up_consumer.handler = handler;
ret = copy_from_user(&uprobe_handler->offset, &callsite->u.uprobe.offset, sizeof(uint64_t));
if (ret) {
goto register_error;
}
- ret = wrapper_uprobe_register(event->u.uprobe.inode,
+ ret = wrapper_uprobe_register(uprobe->inode,
uprobe_handler->offset, &uprobe_handler->up_consumer);
if (ret) {
- printk(KERN_WARNING "Error registering probe on inode %lu "
- "and offset 0x%llx\n", event->u.uprobe.inode->i_ino,
+ printk(KERN_WARNING "LTTng: Error registering probe on inode %lu "
+ "and offset 0x%llx\n", uprobe->inode->i_ino,
uprobe_handler->offset);
ret = -1;
goto register_error;
}
- list_add(&uprobe_handler->node, &event->u.uprobe.head);
+ list_add(&uprobe_handler->node, &uprobe->head);
return ret;
end:
return ret;
}
-EXPORT_SYMBOL_GPL(lttng_uprobes_add_callsite);
-int lttng_uprobes_register(const char *name, int fd, struct lttng_event *event)
+int lttng_uprobes_event_add_callsite(struct lttng_event *event,
+ struct lttng_kernel_event_callsite __user *callsite)
+{
+ return lttng_uprobes_add_callsite(&event->u.uprobe, callsite,
+ lttng_uprobes_event_handler_pre, event);
+}
+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)
{
int ret = 0;
struct inode *inode;
- ret = lttng_create_uprobe_event(name, event);
- if (ret)
- goto error;
-
inode = get_inode_from_fd(fd);
if (!inode) {
- printk(KERN_WARNING "Cannot get inode from fd\n");
+ printk(KERN_WARNING "LTTng: Cannot get inode from fd\n");
ret = -EBADF;
goto inode_error;
}
- event->u.uprobe.inode = inode;
- INIT_LIST_HEAD(&event->u.uprobe.head);
+ uprobe->inode = inode;
+ INIT_LIST_HEAD(&uprobe->head);
+
+inode_error:
+ return ret;
+}
+
+int lttng_uprobes_register_event(const char *name, int fd, struct lttng_event *event)
+{
+ int ret = 0;
+
+ ret = lttng_create_uprobe_event(name, event);
+ if (ret)
+ goto error;
+
+ ret = lttng_uprobes_register(&event->u.uprobe, fd);
+ if (ret)
+ goto register_error;
return 0;
-inode_error:
+register_error:
kfree(event->desc->name);
kfree(event->desc);
error:
return ret;
}
-EXPORT_SYMBOL_GPL(lttng_uprobes_register);
+EXPORT_SYMBOL_GPL(lttng_uprobes_register_event);
-void lttng_uprobes_unregister(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->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);
+EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event);
-void lttng_uprobes_destroy_private(struct lttng_event *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);
}
-EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_private);
+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->name);
+ kfree(event_notifier->desc);
+}
+EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_notifier_private);
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Yannick Brosseau");
projects / lttng-modules.git / blobdiff