X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=lttng-abi.c;h=d4c5ea0fc8938d1d31b6639357546b24a5d19ffa;hb=f127e61ee231d002fb9a7803643a157e06f6d2e2;hp=261a0ad3f8a1bf0ae4af6e76c9a2a246115589b4;hpb=dd5a0db3ea07c46bee3c1814ef7326736f38a06e;p=lttng-modules.git

diff --git a/lttng-abi.c b/lttng-abi.c
index 261a0ad3..d4c5ea0f 100644
--- a/lttng-abi.c
+++ b/lttng-abi.c
@@ -49,6 +49,7 @@
 #include "wrapper/ringbuffer/backend.h"
 #include "wrapper/ringbuffer/frontend.h"
 #include "wrapper/poll.h"
+#include "wrapper/file.h"
 #include "lttng-abi.h"
 #include "lttng-abi-old.h"
 #include "lttng-events.h"
@@ -83,7 +84,7 @@ int lttng_abi_create_session(void)
 	session = lttng_session_create();
 	if (!session)
 		return -ENOMEM;
-	session_fd = get_unused_fd();
+	session_fd = lttng_get_unused_fd();
 	if (session_fd < 0) {
 		ret = session_fd;
 		goto fd_error;
@@ -112,13 +113,13 @@ int lttng_abi_tracepoint_list(void)
 	struct file *tracepoint_list_file;
 	int file_fd, ret;
 
-	file_fd = get_unused_fd();
+	file_fd = lttng_get_unused_fd();
 	if (file_fd < 0) {
 		ret = file_fd;
 		goto fd_error;
 	}
 
-	tracepoint_list_file = anon_inode_getfile("[lttng_session]",
+	tracepoint_list_file = anon_inode_getfile("[lttng_tracepoint_list]",
 					  &lttng_tracepoint_list_fops,
 					  NULL, O_RDWR);
 	if (IS_ERR(tracepoint_list_file)) {
@@ -143,6 +144,51 @@ fd_error:
 	return ret;
 }
 
+#ifndef CONFIG_HAVE_SYSCALL_TRACEPOINTS
+static inline
+int lttng_abi_syscall_list(void)
+{
+	return -ENOSYS;
+}
+#else
+static
+int lttng_abi_syscall_list(void)
+{
+	struct file *syscall_list_file;
+	int file_fd, ret;
+
+	file_fd = lttng_get_unused_fd();
+	if (file_fd < 0) {
+		ret = file_fd;
+		goto fd_error;
+	}
+
+	syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
+					  &lttng_syscall_list_fops,
+					  NULL, O_RDWR);
+	if (IS_ERR(syscall_list_file)) {
+		ret = PTR_ERR(syscall_list_file);
+		goto file_error;
+	}
+	ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
+	if (ret < 0)
+		goto open_error;
+	fd_install(file_fd, syscall_list_file);
+	if (file_fd < 0) {
+		ret = file_fd;
+		goto fd_error;
+	}
+	return file_fd;
+
+open_error:
+	fput(syscall_list_file);
+file_error:
+	put_unused_fd(file_fd);
+fd_error:
+	return ret;
+}
+#endif
+
 static
 void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v)
 {
@@ -151,6 +197,13 @@ void lttng_abi_tracer_version(struct lttng_kernel_tracer_version *v)
 	v->patchlevel = LTTNG_MODULES_PATCHLEVEL_VERSION;
 }
 
+static
+void lttng_abi_tracer_abi_version(struct lttng_kernel_tracer_abi_version *v)
+{
+	v->major = LTTNG_MODULES_ABI_MAJOR_VERSION;
+	v->minor = LTTNG_MODULES_ABI_MINOR_VERSION;
+}
+
 static
 long lttng_abi_add_context(struct file *file,
 	struct lttng_kernel_context *context_param,
@@ -208,6 +261,8 @@ long lttng_abi_add_context(struct file *file,
  *		Returns a file descriptor listing available tracepoints
  *	LTTNG_KERNEL_WAIT_QUIESCENT
  *		Returns after all previously running probes have completed
+ *	LTTNG_KERNEL_TRACER_ABI_VERSION
+ *		Returns the LTTng kernel tracer ABI version
  *
  * The returned session will be deleted when its file descriptor is closed.
  */
@@ -241,7 +296,19 @@ long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 			(struct lttng_kernel_tracer_version __user *) arg;
 
 		lttng_abi_tracer_version(&version);
-		
+
+		if (copy_to_user(uversion, &version, sizeof(version)))
+			return -EFAULT;
+		return 0;
+	}
+	case LTTNG_KERNEL_TRACER_ABI_VERSION:
+	{
+		struct lttng_kernel_tracer_abi_version version;
+		struct lttng_kernel_tracer_abi_version *uversion =
+			(struct lttng_kernel_tracer_abi_version __user *) arg;
+
+		lttng_abi_tracer_abi_version(&version);
+
 		if (copy_to_user(uversion, &version, sizeof(version)))
 			return -EFAULT;
 		return 0;
@@ -249,6 +316,8 @@ long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case LTTNG_KERNEL_OLD_TRACEPOINT_LIST:
 	case LTTNG_KERNEL_TRACEPOINT_LIST:
 		return lttng_abi_tracepoint_list();
+	case LTTNG_KERNEL_SYSCALL_LIST:
+		return lttng_abi_syscall_list();
 	case LTTNG_KERNEL_OLD_WAIT_QUIESCENT:
 	case LTTNG_KERNEL_WAIT_QUIESCENT:
 		synchronize_trace();
@@ -309,7 +378,7 @@ int lttng_abi_create_channel(struct file *session_file,
 	int chan_fd;
 	int ret = 0;
 
-	chan_fd = get_unused_fd();
+	chan_fd = lttng_get_unused_fd();
 	if (chan_fd < 0) {
 		ret = chan_fd;
 		goto fd_error;
@@ -399,6 +468,10 @@ fd_error:
  *		Disables tracing for a session (strong disable)
  *	LTTNG_KERNEL_METADATA
  *		Returns a LTTng metadata file descriptor
+ *	LTTNG_KERNEL_SESSION_TRACK_PID
+ *		Add PID to session tracker
+ *	LTTNG_KERNEL_SESSION_UNTRACK_PID
+ *		Remove PID from session tracker
  *
  * The returned channel will be deleted when its file descriptor is closed.
  */
@@ -478,6 +551,12 @@ long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		return lttng_abi_create_channel(file, &chan_param,
 				METADATA_CHANNEL);
 	}
+	case LTTNG_KERNEL_SESSION_TRACK_PID:
+		return lttng_session_track_pid(session, (int) arg);
+	case LTTNG_KERNEL_SESSION_UNTRACK_PID:
+		return lttng_session_untrack_pid(session, (int) arg);
+	case LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS:
+		return lttng_session_list_tracker_pids(session);
 	default:
 		return -ENOIOCTLCMD;
 	}
@@ -760,7 +839,7 @@ int lttng_abi_create_stream_fd(struct file *channel_file, void *stream_priv,
 	int stream_fd, ret;
 	struct file *stream_file;
 
-	stream_fd = get_unused_fd();
+	stream_fd = lttng_get_unused_fd();
 	if (stream_fd < 0) {
 		ret = stream_fd;
 		goto fd_error;
@@ -841,6 +920,7 @@ int lttng_abi_open_metadata_stream(struct file *channel_file)
 	metadata_stream->priv = buf;
 	stream_priv = metadata_stream;
 	metadata_stream->transport = channel->transport;
+	mutex_init(&metadata_stream->lock);
 
 	/*
 	 * Since life-time of metadata cache differs from that of
@@ -876,9 +956,9 @@ int lttng_abi_create_event(struct file *channel_file,
 			   struct lttng_kernel_event *event_param)
 {
 	struct lttng_channel *channel = channel_file->private_data;
-	struct lttng_event *event;
 	int event_fd, ret;
 	struct file *event_file;
+	void *priv;
 
 	event_param->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
 	switch (event_param->instrumentation) {
@@ -894,47 +974,51 @@ int lttng_abi_create_event(struct file *channel_file,
 	default:
 		break;
 	}
-	switch (event_param->instrumentation) {
-	default:
-		event_fd = get_unused_fd();
-		if (event_fd < 0) {
-			ret = event_fd;
-			goto fd_error;
-		}
-		event_file = anon_inode_getfile("[lttng_event]",
-						&lttng_event_fops,
-						NULL, O_RDWR);
-		if (IS_ERR(event_file)) {
-			ret = PTR_ERR(event_file);
-			goto file_error;
+	event_fd = lttng_get_unused_fd();
+	if (event_fd < 0) {
+		ret = event_fd;
+		goto fd_error;
+	}
+	event_file = anon_inode_getfile("[lttng_event]",
+					&lttng_event_fops,
+					NULL, O_RDWR);
+	if (IS_ERR(event_file)) {
+		ret = PTR_ERR(event_file);
+		goto file_error;
+	}
+	if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
+			|| event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
+		struct lttng_enabler *enabler;
+
+		if (event_param->name[strlen(event_param->name) - 1] == '*') {
+			enabler = lttng_enabler_create(LTTNG_ENABLER_WILDCARD,
+				event_param, channel);
+		} else {
+			enabler = lttng_enabler_create(LTTNG_ENABLER_NAME,
+				event_param, channel);
 		}
+		priv = enabler;
+	} else {
+		struct lttng_event *event;
+
 		/*
 		 * We tolerate no failure path after event creation. It
 		 * will stay invariant for the rest of the session.
 		 */
-		event = lttng_event_create(channel, event_param, NULL, NULL);
+		event = lttng_event_create(channel, event_param,
+				NULL, NULL,
+				event_param->instrumentation);
 		WARN_ON_ONCE(!event);
 		if (IS_ERR(event)) {
 			ret = PTR_ERR(event);
 			goto event_error;
 		}
-		event_file->private_data = event;
-		fd_install(event_fd, event_file);
-		/* The event holds a reference on the channel */
-		atomic_long_inc(&channel_file->f_count);
-		break;
-	case LTTNG_KERNEL_SYSCALL:
-		/*
-		 * Only all-syscall tracing supported for now.
-		 */
-		if (event_param->name[0] != '\0')
-			return -EINVAL;
-		ret = lttng_syscalls_register(channel, NULL);
-		if (ret)
-			goto fd_error;
-		event_fd = 0;
-		break;
+		priv = event;
 	}
+	event_file->private_data = priv;
+	fd_install(event_fd, event_file);
+	/* The event holds a reference on the channel */
+	atomic_long_inc(&channel_file->f_count);
 	return event_fd;
 
 event_error:
@@ -1121,6 +1205,9 @@ old_ctx_end:
 	case LTTNG_KERNEL_OLD_DISABLE:
 	case LTTNG_KERNEL_DISABLE:
 		return lttng_channel_disable(channel);
+	case LTTNG_KERNEL_SYSCALL_MASK:
+		return lttng_channel_syscall_mask(channel,
+			(struct lttng_kernel_syscall_mask __user *) arg);
 	default:
 		return -ENOIOCTLCMD;
 	}
@@ -1240,77 +1327,59 @@ static const struct file_operations lttng_metadata_fops = {
 static
 long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
-	struct lttng_event *event = file->private_data;
+	struct lttng_event *event;
+	struct lttng_enabler *enabler;
+	enum lttng_event_type *evtype = file->private_data;
 
 	switch (cmd) {
 	case LTTNG_KERNEL_OLD_CONTEXT:
 	{
-		struct lttng_kernel_context *ucontext_param;
-		struct lttng_kernel_old_context *old_ucontext_param;
-		int ret;
-
-		ucontext_param = kmalloc(sizeof(struct lttng_kernel_context),
-				GFP_KERNEL);
-		if (!ucontext_param) {
-			ret = -ENOMEM;
-			goto old_ctx_end;
-		}
-		old_ucontext_param = kmalloc(sizeof(struct lttng_kernel_old_context),
-				GFP_KERNEL);
-		if (!old_ucontext_param) {
-			ret = -ENOMEM;
-			goto old_ctx_error_free_param;
-		}
-
-		if (copy_from_user(old_ucontext_param,
-					(struct lttng_kernel_old_context __user *) arg,
-					sizeof(struct lttng_kernel_old_context))) {
-			ret = -EFAULT;
-			goto old_ctx_error_free_old_param;
-		}
-		ucontext_param->ctx = old_ucontext_param->ctx;
-		memcpy(ucontext_param->padding, old_ucontext_param->padding,
-				sizeof(ucontext_param->padding));
-		/* only type that uses the union */
-		if (old_ucontext_param->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) {
-			ucontext_param->u.perf_counter.type =
-				old_ucontext_param->u.perf_counter.type;
-			ucontext_param->u.perf_counter.config =
-				old_ucontext_param->u.perf_counter.config;
-			memcpy(ucontext_param->u.perf_counter.name,
-					old_ucontext_param->u.perf_counter.name,
-					sizeof(ucontext_param->u.perf_counter.name));
-		}
-
-		ret = lttng_abi_add_context(file,
-				ucontext_param,
-				&event->ctx, event->chan->session);
-
-old_ctx_error_free_old_param:
-		kfree(old_ucontext_param);
-old_ctx_error_free_param:
-		kfree(ucontext_param);
-old_ctx_end:
-		return ret;
+		/* Not implemented */
+		return -ENOSYS;
 	}
 	case LTTNG_KERNEL_CONTEXT:
 	{
-		struct lttng_kernel_context ucontext_param;
-
-		if (copy_from_user(&ucontext_param,
-					(struct lttng_kernel_context __user *) arg,
-					sizeof(ucontext_param)))
-			return -EFAULT;
-		return lttng_abi_add_context(file,
-				&ucontext_param,
-				&event->ctx, event->chan->session);
+		/* Not implemented */
+		return -ENOSYS;
 	}
 	case LTTNG_KERNEL_OLD_ENABLE:
 	case LTTNG_KERNEL_ENABLE:
-		return lttng_event_enable(event);
+		switch (*evtype) {
+		case LTTNG_TYPE_EVENT:
+			event = file->private_data;
+			return lttng_event_enable(event);
+		case LTTNG_TYPE_ENABLER:
+			enabler = file->private_data;
+			return lttng_enabler_enable(enabler);
+		default:
+			WARN_ON_ONCE(1);
+			return -ENOSYS;
+		}
 	case LTTNG_KERNEL_OLD_DISABLE:
 	case LTTNG_KERNEL_DISABLE:
-		return lttng_event_disable(event);
+		switch (*evtype) {
+		case LTTNG_TYPE_EVENT:
+			event = file->private_data;
+			return lttng_event_disable(event);
+		case LTTNG_TYPE_ENABLER:
+			enabler = file->private_data;
+			return lttng_enabler_disable(enabler);
+		default:
+			WARN_ON_ONCE(1);
+			return -ENOSYS;
+		}
+	case LTTNG_KERNEL_FILTER:
+		switch (*evtype) {
+		case LTTNG_TYPE_EVENT:
+			return -EINVAL;
+		case LTTNG_TYPE_ENABLER:
+		{
+			enabler = file->private_data;
+			return lttng_enabler_attach_bytecode(enabler,
+				(struct lttng_kernel_filter_bytecode __user *) arg);
+		}
+
+		}
 	default:
 		return -ENOIOCTLCMD;
 	}
@@ -1319,10 +1388,29 @@ old_ctx_end:
 static
 int lttng_event_release(struct inode *inode, struct file *file)
 {
-	struct lttng_event *event = file->private_data;
+	struct lttng_event *event;
+	struct lttng_enabler *enabler;
+	enum lttng_event_type *evtype = file->private_data;
+
+	if (!evtype)
+		return 0;
+
+	switch (*evtype) {
+	case LTTNG_TYPE_EVENT:
+		event = file->private_data;
+		if (event)
+			fput(event->chan->file);
+		break;
+	case LTTNG_TYPE_ENABLER:
+		enabler = file->private_data;
+		if (enabler)
+			fput(enabler->chan->file);
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		break;
+	}
 
-	if (event)
-		fput(event->chan->file);
 	return 0;
 }
 
@@ -1555,7 +1643,8 @@ error:
 	return ret;
 }
 
-void __exit lttng_abi_exit(void)
+/* No __exit annotation because used by init error path too. */
+void lttng_abi_exit(void)
 {
 	if (lttng_proc_dentry)
 		remove_proc_entry("lttng", NULL);