*
*/
-#include <linux/fdtable.h>
+#include <wrapper/fdtable.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/namei.h>
.event = event,
.interruptible = !lttng_regs_irqs_disabled(regs),
};
- struct lttng_channel *chan = event->chan;
- struct lib_ring_buffer_ctx ctx;
+ struct lttng_event_container *container = event->container;
int ret;
struct {
unsigned long ip;
} payload;
- if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
+ if (unlikely(!LTTNG_READ_ONCE(container->session->active)))
return 0;
- if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
+ if (unlikely(!LTTNG_READ_ONCE(container->enabled)))
return 0;
if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
return 0;
- lib_ring_buffer_ctx_init(&ctx, chan->chan, <tng_probe_ctx,
- sizeof(payload), lttng_alignof(payload), -1);
+ switch (container->type) {
+ case LTTNG_EVENT_CONTAINER_CHANNEL:
+ {
+ struct lttng_channel *chan = lttng_event_container_get_channel(container);
+ struct lib_ring_buffer_ctx ctx;
- ret = chan->ops->event_reserve(&ctx, event->id);
- if (ret < 0)
- return 0;
+ 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 0;
- /* Event payload. */
- payload.ip = (unsigned long)instruction_pointer(regs);
+ /* Event payload. */
+ payload.ip = (unsigned long)instruction_pointer(regs);
- lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
- chan->ops->event_write(&ctx, &payload, sizeof(payload));
- chan->ops->event_commit(&ctx);
+ lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
+ chan->ops->event_write(&ctx, &payload, sizeof(payload));
+ chan->ops->event_commit(&ctx);
+ break;
+ }
+ case LTTNG_EVENT_CONTAINER_COUNTER:
+ {
+ struct lttng_counter *counter = lttng_event_container_get_counter(container);
+ size_t index = event->id;
+
+ (void) counter->ops->counter_add(counter->counter, &index, 1);
+ break;
+ }
+ }
+ 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;
}
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
* 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 event_notifier 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)
{
}
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->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);
}
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");
MODULE_DESCRIPTION("Linux Trace Toolkit Uprobes Support");
projects / deliverable / lttng-modules.git / blobdiff