Update licensing info

[lttng-modules.git] / ltt-debugfs-abi.c

diff --git a/ltt-debugfs-abi.c b/ltt-debugfs-abi.c
index 5bfd1d6883ac9114e77e66cf006fce9a51c25874..e192474d5bac68664039c222a30f48d0dedb0959 100644 (file)
--- a/ltt-debugfs-abi.c
+++ b/ltt-debugfs-abi.c
@@ -20,6 +20,8 @@
  *     - Takes an instrumentation source as parameter
  *       - e.g. tracepoints, dynamic_probes...
  *     - Takes instrumentation source specific arguments.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
  */
 
 #include <linux/module.h>
@@ -136,6 +138,35 @@ long lttng_abi_tracer_version(struct file *file,
        return 0;
 }
 
+static
+long lttng_abi_add_context(struct file *file,
+       struct lttng_kernel_context __user *ucontext_param,
+       struct lttng_ctx **ctx, struct ltt_session *session)
+{
+       struct lttng_kernel_context context_param;
+
+       if (session->been_active)
+               return -EPERM;
+
+       if (copy_from_user(&context_param, ucontext_param, sizeof(context_param)))
+               return -EFAULT;
+
+       switch (context_param.ctx) {
+       case LTTNG_KERNEL_CONTEXT_PID:
+               return lttng_add_pid_to_ctx(ctx);
+       case LTTNG_KERNEL_CONTEXT_PRIO:
+               return lttng_add_prio_to_ctx(ctx);
+       case LTTNG_KERNEL_CONTEXT_NICE:
+               return lttng_add_nice_to_ctx(ctx);
+       case LTTNG_KERNEL_CONTEXT_PERF_COUNTER:
+               return -ENOSYS;
+       case LTTNG_KERNEL_CONTEXT_COMM:
+               return lttng_add_comm_to_ctx(ctx);
+       default:
+               return -EINVAL;
+       }
+}
+
 /**
  *     lttng_ioctl - lttng syscall through ioctl
  *
@@ -294,6 +325,12 @@ fd_error:
  *     This ioctl implements lttng commands:
  *     LTTNG_KERNEL_CHANNEL
  *             Returns a LTTng channel file descriptor
+ *     LTTNG_KERNEL_SESSION_START
+ *             Starts tracing session
+ *     LTTNG_KERNEL_SESSION_STOP
+ *             Stops tracing session
+ *     LTTNG_KERNEL_METADATA
+ *             Returns a LTTng metadata file descriptor
  *
  * The returned channel will be deleted when its file descriptor is closed.
  */
@@ -462,17 +499,25 @@ fd_error:
  *              (typically, one event stream records events from one CPU)
  *     LTTNG_KERNEL_EVENT
  *             Returns an event file descriptor or failure.
+ *     LTTNG_KERNEL_CONTEXT
+ *             Prepend a context field to each event in the channel
  *
  * Channel and event file descriptors also hold a reference on the session.
  */
 static
 long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
+       struct ltt_channel *channel = file->private_data;
+
        switch (cmd) {
        case LTTNG_KERNEL_STREAM:
                return lttng_abi_open_stream(file);
        case LTTNG_KERNEL_EVENT:
                return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg);
+       case LTTNG_KERNEL_CONTEXT:
+               return lttng_abi_add_context(file,
+                               (struct lttng_kernel_context __user *) arg,
+                               &channel->ctx, channel->session);
        default:
                return -ENOIOCTLCMD;
        }
@@ -560,6 +605,37 @@ static const struct file_operations lttng_metadata_fops = {
 #endif
 };
 
+/**
+ *     lttng_event_ioctl - lttng syscall through ioctl
+ *
+ *     @file: the file
+ *     @cmd: the command
+ *     @arg: command arg
+ *
+ *     This ioctl implements lttng commands:
+ *      LTTNG_KERNEL_STREAM
+ *              Returns an event stream file descriptor or failure.
+ *              (typically, one event stream records events from one CPU)
+ *     LTTNG_KERNEL_EVENT
+ *             Returns an event file descriptor or failure.
+ *     LTTNG_KERNEL_CONTEXT
+ *             Prepend a context field to each record of this event
+ */
+static
+long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+       struct ltt_event *event = file->private_data;
+
+       switch (cmd) {
+       case LTTNG_KERNEL_CONTEXT:
+               return lttng_abi_add_context(file,
+                               (struct lttng_kernel_context __user *) arg,
+                               &event->ctx, event->chan->session);
+       default:
+               return -ENOIOCTLCMD;
+       }
+}
+
 static
 int lttng_event_release(struct inode *inode, struct file *file)
 {
@@ -573,6 +649,10 @@ int lttng_event_release(struct inode *inode, struct file *file)
 /* TODO: filter control ioctl */
 static const struct file_operations lttng_event_fops = {
        .release = lttng_event_release,
+       .unlocked_ioctl = lttng_event_ioctl,
+#ifdef CONFIG_COMPAT
+       .compat_ioctl = lttng_event_ioctl,
+#endif
 };
 
 int __init ltt_debugfs_abi_init(void)