X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=src%2Flttng-abi.c;h=07c520f00a0c8d2604e0d170186621b35f46e2ae;hb=dffef45d53ab388fd08c19e8865b245b40ca9dff;hp=219d20a044e284c63f1688a9a06df514b28bceb6;hpb=badfe9f5c396efb1b00e5f2abcded2e4ac4a5bac;p=lttng-modules.git

diff --git a/src/lttng-abi.c b/src/lttng-abi.c
index 219d20a0..07c520f0 100644
--- a/src/lttng-abi.c
+++ b/src/lttng-abi.c
@@ -59,6 +59,7 @@ static const struct file_operations lttng_proc_ops;
 #endif
 
 static const struct file_operations lttng_session_fops;
+static const struct file_operations lttng_event_notifier_group_fops;
 static const struct file_operations lttng_channel_fops;
 static const struct file_operations lttng_metadata_fops;
 static const struct file_operations lttng_event_fops;
@@ -105,6 +106,41 @@ fd_error:
 	return ret;
 }
 
+static
+int lttng_abi_create_event_notifier_group(void)
+{
+	struct lttng_event_notifier_group *event_notifier_group;
+	struct file *event_notifier_group_file;
+	int event_notifier_group_fd, ret;
+
+	event_notifier_group = lttng_event_notifier_group_create();
+	if (!event_notifier_group)
+		return -ENOMEM;
+
+	event_notifier_group_fd = lttng_get_unused_fd();
+	if (event_notifier_group_fd < 0) {
+		ret = event_notifier_group_fd;
+		goto fd_error;
+	}
+	event_notifier_group_file = anon_inode_getfile("[lttng_event_notifier_group]",
+					  &lttng_event_notifier_group_fops,
+					  event_notifier_group, O_RDWR);
+	if (IS_ERR(event_notifier_group_file)) {
+		ret = PTR_ERR(event_notifier_group_file);
+		goto file_error;
+	}
+
+	event_notifier_group->file = event_notifier_group_file;
+	fd_install(event_notifier_group_fd, event_notifier_group_file);
+	return event_notifier_group_fd;
+
+file_error:
+	put_unused_fd(event_notifier_group_fd);
+fd_error:
+	lttng_event_notifier_group_destroy(event_notifier_group);
+	return ret;
+}
+
 static
 int lttng_abi_tracepoint_list(void)
 {
@@ -306,6 +342,8 @@ long lttng_abi_add_context(struct file *file,
  *		Returns after all previously running probes have completed
  *	LTTNG_KERNEL_TRACER_ABI_VERSION
  *		Returns the LTTng kernel tracer ABI version
+ *	LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE
+ *		Returns a LTTng event notifier group file descriptor
  *
  * The returned session will be deleted when its file descriptor is closed.
  */
@@ -316,6 +354,8 @@ long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case LTTNG_KERNEL_OLD_SESSION:
 	case LTTNG_KERNEL_SESSION:
 		return lttng_abi_create_session();
+	case LTTNG_KERNEL_EVENT_NOTIFIER_GROUP_CREATE:
+		return lttng_abi_create_event_notifier_group();
 	case LTTNG_KERNEL_OLD_TRACER_VERSION:
 	{
 		struct lttng_kernel_tracer_version v;
@@ -1140,7 +1180,7 @@ const struct file_operations lttng_metadata_ring_buffer_file_operations = {
 
 static
 int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
-		const struct file_operations *fops)
+		const struct file_operations *fops, const char *name)
 {
 	int stream_fd, ret;
 	struct file *stream_file;
@@ -1150,8 +1190,7 @@ int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
 		ret = stream_fd;
 		goto fd_error;
 	}
-	stream_file = anon_inode_getfile("[lttng_stream]", fops,
-			stream_priv, O_RDWR);
+	stream_file = anon_inode_getfile(name, fops, stream_priv, O_RDWR);
 	if (IS_ERR(stream_file)) {
 		ret = PTR_ERR(stream_file);
 		goto file_error;
@@ -1190,7 +1229,8 @@ int lttng_abi_open_stream(struct file *channel_file)
 
 	stream_priv = buf;
 	ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
-			&lttng_stream_ring_buffer_file_operations);
+			&lttng_stream_ring_buffer_file_operations,
+			"[lttng_stream]");
 	if (ret < 0)
 		goto fd_error;
 
@@ -1245,7 +1285,8 @@ int lttng_abi_open_metadata_stream(struct file *channel_file)
 	}
 
 	ret = lttng_abi_create_stream_fd(channel_file, stream_priv,
-			&lttng_metadata_ring_buffer_file_operations);
+			&lttng_metadata_ring_buffer_file_operations,
+			"[lttng_metadata_stream]");
 	if (ret < 0)
 		goto fd_error;
 
@@ -1352,20 +1393,20 @@ int lttng_abi_create_event(struct file *channel_file,
 		goto event_error;
 	if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
 			|| event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
-		struct lttng_enabler *enabler;
+		struct lttng_event_enabler *event_enabler;
 
 		if (strutils_is_star_glob_pattern(event_param->name)) {
 			/*
 			 * If the event name is a star globbing pattern,
 			 * we create the special star globbing enabler.
 			 */
-			enabler = lttng_enabler_create(LTTNG_ENABLER_STAR_GLOB,
+			event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_STAR_GLOB,
 				event_param, channel);
 		} else {
-			enabler = lttng_enabler_create(LTTNG_ENABLER_NAME,
+			event_enabler = lttng_event_enabler_create(LTTNG_ENABLER_FORMAT_NAME,
 				event_param, channel);
 		}
-		priv = enabler;
+		priv = event_enabler;
 	} else {
 		struct lttng_event *event;
 
@@ -1397,6 +1438,229 @@ fd_error:
 	return ret;
 }
 
+static
+long lttng_event_notifier_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct lttng_event_notifier_enabler *event_notifier_enabler;
+	enum lttng_event_type *evtype = file->private_data;
+
+	switch (cmd) {
+	case LTTNG_KERNEL_ENABLE:
+		switch (*evtype) {
+		case LTTNG_TYPE_EVENT:
+			return -EINVAL;
+		case LTTNG_TYPE_ENABLER:
+			event_notifier_enabler = file->private_data;
+			return lttng_event_notifier_enabler_enable(event_notifier_enabler);
+		default:
+			WARN_ON_ONCE(1);
+			return -ENOSYS;
+		}
+	case LTTNG_KERNEL_DISABLE:
+		switch (*evtype) {
+		case LTTNG_TYPE_EVENT:
+			return -EINVAL;
+		case LTTNG_TYPE_ENABLER:
+			event_notifier_enabler = file->private_data;
+			return lttng_event_notifier_enabler_disable(event_notifier_enabler);
+		default:
+			WARN_ON_ONCE(1);
+			return -ENOSYS;
+		}
+	case LTTNG_KERNEL_FILTER:
+		switch (*evtype) {
+		case LTTNG_TYPE_EVENT:
+			return -EINVAL;
+		case LTTNG_TYPE_ENABLER:
+			event_notifier_enabler = file->private_data;
+			return lttng_event_notifier_enabler_attach_bytecode(event_notifier_enabler,
+				(struct lttng_kernel_filter_bytecode __user *) arg);
+		default:
+			WARN_ON_ONCE(1);
+			return -ENOSYS;
+		}
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+static
+int lttng_event_notifier_release(struct inode *inode, struct file *file)
+{
+	struct lttng_event_notifier *event_notifier;
+	struct lttng_event_notifier_enabler *event_notifier_enabler;
+	enum lttng_event_type *evtype = file->private_data;
+
+	if (!evtype)
+		return 0;
+
+	switch (*evtype) {
+	case LTTNG_TYPE_EVENT:
+		event_notifier = file->private_data;
+		if (event_notifier)
+			fput(event_notifier->group->file);
+		break;
+	case LTTNG_TYPE_ENABLER:
+		event_notifier_enabler = file->private_data;
+		if (event_notifier_enabler)
+			fput(event_notifier_enabler->group->file);
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		break;
+	}
+
+	return 0;
+}
+
+static const struct file_operations lttng_event_notifier_fops = {
+	.owner = THIS_MODULE,
+	.release = lttng_event_notifier_release,
+	.unlocked_ioctl = lttng_event_notifier_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = lttng_event_notifier_ioctl,
+#endif
+};
+
+static
+int lttng_abi_create_event_notifier(struct file *event_notifier_group_file,
+		struct lttng_kernel_event_notifier *event_notifier_param)
+{
+	struct lttng_event_notifier_group *event_notifier_group =
+			event_notifier_group_file->private_data;
+	int event_notifier_fd, ret;
+	struct file *event_notifier_file;
+	void *priv;
+
+	switch (event_notifier_param->event.instrumentation) {
+	case LTTNG_KERNEL_TRACEPOINT:
+	case LTTNG_KERNEL_KPROBE:
+	case LTTNG_KERNEL_UPROBE:
+	case LTTNG_KERNEL_KRETPROBE:
+	case LTTNG_KERNEL_FUNCTION:
+	case LTTNG_KERNEL_NOOP:
+	case LTTNG_KERNEL_SYSCALL:
+	default:
+		ret = -EINVAL;
+		goto inval_instr;
+	}
+
+	event_notifier_param->event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+
+	event_notifier_fd = lttng_get_unused_fd();
+	if (event_notifier_fd < 0) {
+		ret = event_notifier_fd;
+		goto fd_error;
+	}
+
+	event_notifier_file = anon_inode_getfile("[lttng_event_notifier]",
+					&lttng_event_notifier_fops,
+					NULL, O_RDWR);
+	if (IS_ERR(event_notifier_file)) {
+		ret = PTR_ERR(event_notifier_file);
+		goto file_error;
+	}
+
+	/* The event notifier holds a reference on the event notifier group. */
+	if (!atomic_long_add_unless(&event_notifier_group_file->f_count, 1, LONG_MAX)) {
+		ret = -EOVERFLOW;
+		goto refcount_error;
+	}
+
+	if (event_notifier_param->event.instrumentation == LTTNG_KERNEL_TRACEPOINT
+			|| event_notifier_param->event.instrumentation == LTTNG_KERNEL_SYSCALL) {
+		struct lttng_event_notifier_enabler *enabler;
+
+		if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) {
+			/*
+			 * If the event name is a star globbing pattern,
+			 * we create the special star globbing enabler.
+			 */
+			enabler = lttng_event_notifier_enabler_create(
+					event_notifier_group,
+					LTTNG_ENABLER_FORMAT_STAR_GLOB,
+					event_notifier_param);
+		} else {
+			enabler = lttng_event_notifier_enabler_create(
+					event_notifier_group,
+					LTTNG_ENABLER_FORMAT_NAME,
+					event_notifier_param);
+		}
+		priv = enabler;
+	} else {
+		struct lttng_event_notifier *event_notifier;
+
+		/*
+		 * We tolerate no failure path after event notifier creation.
+		 * It will stay invariant for the rest of the session.
+		 */
+		event_notifier = lttng_event_notifier_create(NULL,
+				event_notifier_param->event.token, event_notifier_group,
+				event_notifier_param, NULL,
+				event_notifier_param->event.instrumentation);
+		WARN_ON_ONCE(!event_notifier);
+		if (IS_ERR(event_notifier)) {
+			ret = PTR_ERR(event_notifier);
+			goto event_notifier_error;
+		}
+		priv = event_notifier;
+	}
+	event_notifier_file->private_data = priv;
+	fd_install(event_notifier_fd, event_notifier_file);
+	return event_notifier_fd;
+
+event_notifier_error:
+	atomic_long_dec(&event_notifier_group_file->f_count);
+refcount_error:
+	fput(event_notifier_file);
+file_error:
+	put_unused_fd(event_notifier_fd);
+fd_error:
+inval_instr:
+	return ret;
+}
+
+static
+long lttng_event_notifier_group_ioctl(struct file *file, unsigned int cmd,
+		unsigned long arg)
+{
+	switch (cmd) {
+	case LTTNG_KERNEL_EVENT_NOTIFIER_CREATE:
+	{
+		struct lttng_kernel_event_notifier uevent_notifier_param;
+
+		if (copy_from_user(&uevent_notifier_param,
+				(struct lttng_kernel_event_notifier __user *) arg,
+				sizeof(uevent_notifier_param)))
+			return -EFAULT;
+		return lttng_abi_create_event_notifier(file, &uevent_notifier_param);
+	}
+	default:
+		return -ENOIOCTLCMD;
+	}
+	return 0;
+}
+
+static
+int lttng_event_notifier_group_release(struct inode *inode, struct file *file)
+{
+	struct lttng_event_notifier_group *event_notifier_group =
+			file->private_data;
+
+	if (event_notifier_group)
+		lttng_event_notifier_group_destroy(event_notifier_group);
+	return 0;
+}
+
+static const struct file_operations lttng_event_notifier_group_fops = {
+	.owner = THIS_MODULE,
+	.release = lttng_event_notifier_group_release,
+	.unlocked_ioctl = lttng_event_notifier_group_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = lttng_event_notifier_group_ioctl,
+#endif
+};
+
 /**
  *	lttng_channel_ioctl - lttng syscall through ioctl
  *
@@ -1694,7 +1958,7 @@ static
 long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct lttng_event *event;
-	struct lttng_enabler *enabler;
+	struct lttng_event_enabler *event_enabler;
 	enum lttng_event_type *evtype = file->private_data;
 
 	switch (cmd) {
@@ -1715,8 +1979,8 @@ long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 			event = file->private_data;
 			return lttng_event_enable(event);
 		case LTTNG_TYPE_ENABLER:
-			enabler = file->private_data;
-			return lttng_enabler_enable(enabler);
+			event_enabler = file->private_data;
+			return lttng_event_enabler_enable(event_enabler);
 		default:
 			WARN_ON_ONCE(1);
 			return -ENOSYS;
@@ -1728,8 +1992,8 @@ long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 			event = file->private_data;
 			return lttng_event_disable(event);
 		case LTTNG_TYPE_ENABLER:
-			enabler = file->private_data;
-			return lttng_enabler_disable(enabler);
+			event_enabler = file->private_data;
+			return lttng_event_enabler_disable(event_enabler);
 		default:
 			WARN_ON_ONCE(1);
 			return -ENOSYS;
@@ -1740,8 +2004,8 @@ long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 			return -EINVAL;
 		case LTTNG_TYPE_ENABLER:
 		{
-			enabler = file->private_data;
-			return lttng_enabler_attach_bytecode(enabler,
+			event_enabler = file->private_data;
+			return lttng_event_enabler_attach_bytecode(event_enabler,
 				(struct lttng_kernel_filter_bytecode __user *) arg);
 		}
 		default:
@@ -1769,7 +2033,7 @@ static
 int lttng_event_release(struct inode *inode, struct file *file)
 {
 	struct lttng_event *event;
-	struct lttng_enabler *enabler;
+	struct lttng_event_enabler *event_enabler;
 	enum lttng_event_type *evtype = file->private_data;
 
 	if (!evtype)
@@ -1782,9 +2046,9 @@ int lttng_event_release(struct inode *inode, struct file *file)
 			fput(event->chan->file);
 		break;
 	case LTTNG_TYPE_ENABLER:
-		enabler = file->private_data;
-		if (enabler)
-			fput(enabler->chan->file);
+		event_enabler = file->private_data;
+		if (event_enabler)
+			fput(event_enabler->chan->file);
 		break;
 	default:
 		WARN_ON_ONCE(1);