Add pid/ppid/tid/vtid/vpid/vppid contexts

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

diff --git a/ltt-debugfs-abi.c b/ltt-debugfs-abi.c
index afdc09a61ad8eb0dcc1e39be75ec8be03d6a2169..aa8dc0f4a0d973af21f4739aa373170cfb63a9d6 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>
@@ -30,6 +32,7 @@
 #include <linux/slab.h>
 #include "wrapper/vmalloc.h"   /* for wrapper_vmalloc_sync_all() */
 #include "wrapper/ringbuffer/vfs.h"
+#include "wrapper/poll.h"
 #include "ltt-debugfs-abi.h"
 #include "ltt-events.h"
 #include "ltt-tracer.h"
@@ -152,8 +155,26 @@ long lttng_abi_add_context(struct file *file,
        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_VPID:
+               return lttng_add_vpid_to_ctx(ctx);
+       case LTTNG_KERNEL_CONTEXT_TID:
+               return lttng_add_tid_to_ctx(ctx);
+       case LTTNG_KERNEL_CONTEXT_VTID:
+               return lttng_add_vtid_to_ctx(ctx);
+       case LTTNG_KERNEL_CONTEXT_PPID:
+               return lttng_add_ppid_to_ctx(ctx);
+       case LTTNG_KERNEL_CONTEXT_VPPID:
+               return lttng_add_vppid_to_ctx(ctx);
        case LTTNG_KERNEL_CONTEXT_PERF_COUNTER:
-               return -ENOSYS;
+               context_param.u.perf_counter.name[LTTNG_SYM_NAME_LEN - 1] = '\0';
+               return lttng_add_perf_counter_to_ctx(context_param.u.perf_counter.type,
+                               context_param.u.perf_counter.config,
+                               context_param.u.perf_counter.name,
+                               ctx);
        case LTTNG_KERNEL_CONTEXT_COMM:
                return lttng_add_comm_to_ctx(ctx);
        default:
@@ -319,10 +340,10 @@ 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_ENABLE
+ *             Enables tracing for a session (weak enable)
+ *     LTTNG_KERNEL_DISABLE
+ *             Disables tracing for a session (strong disable)
  *     LTTNG_KERNEL_METADATA
  *             Returns a LTTng metadata file descriptor
  *
@@ -339,9 +360,11 @@ long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                                (struct lttng_kernel_channel __user *) arg,
                                PER_CPU_CHANNEL);
        case LTTNG_KERNEL_SESSION_START:
-               return ltt_session_start(session);
+       case LTTNG_KERNEL_ENABLE:
+               return ltt_session_enable(session);
        case LTTNG_KERNEL_SESSION_STOP:
-               return ltt_session_stop(session);
+       case LTTNG_KERNEL_DISABLE:
+               return ltt_session_disable(session);
        case LTTNG_KERNEL_METADATA:
                return lttng_abi_create_channel(file,
                                (struct lttng_kernel_channel __user *) arg,
@@ -495,6 +518,10 @@ fd_error:
  *             Returns an event file descriptor or failure.
  *     LTTNG_KERNEL_CONTEXT
  *             Prepend a context field to each event in the channel
+ *     LTTNG_KERNEL_ENABLE
+ *             Enable recording for events in this channel (weak enable)
+ *     LTTNG_KERNEL_DISABLE
+ *             Disable recording for events in this channel (strong disable)
  *
  * Channel and event file descriptors also hold a reference on the session.
  */
@@ -512,6 +539,10 @@ long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                return lttng_abi_add_context(file,
                                (struct lttng_kernel_context __user *) arg,
                                &channel->ctx, channel->session);
+       case LTTNG_KERNEL_ENABLE:
+               return ltt_channel_enable(channel);
+       case LTTNG_KERNEL_DISABLE:
+               return ltt_channel_disable(channel);
        default:
                return -ENOIOCTLCMD;
        }
@@ -541,8 +572,6 @@ long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg
        }
 }
 
-/* TODO: poll */
-#if 0
 /**
  *     lttng_channel_poll - lttng stream addition/removal monitoring
  *
@@ -556,10 +585,12 @@ unsigned int lttng_channel_poll(struct file *file, poll_table *wait)
 
        if (file->f_mode & FMODE_READ) {
                poll_wait_set_exclusive(wait);
-               poll_wait(file, &channel->notify_wait, wait);
+               poll_wait(file, channel->ops->get_hp_wait_queue(channel->chan),
+                         wait);
 
-               /* TODO: identify when the channel is being finalized. */
-               if (finalized)
+               if (channel->ops->is_disabled(channel->chan))
+                       return POLLERR;
+               if (channel->ops->is_finalized(channel->chan))
                        return POLLHUP;
                else
                        return POLLIN | POLLRDNORM;
@@ -567,7 +598,6 @@ unsigned int lttng_channel_poll(struct file *file, poll_table *wait)
        return mask;
 
 }
-#endif //0
 
 static
 int lttng_channel_release(struct inode *inode, struct file *file)
@@ -581,10 +611,7 @@ int lttng_channel_release(struct inode *inode, struct file *file)
 
 static const struct file_operations lttng_channel_fops = {
        .release = lttng_channel_release,
-/* TODO */
-#if 0
        .poll = lttng_channel_poll,
-#endif //0
        .unlocked_ioctl = lttng_channel_ioctl,
 #ifdef CONFIG_COMPAT
        .compat_ioctl = lttng_channel_ioctl,
@@ -607,13 +634,12 @@ static const struct file_operations lttng_metadata_fops = {
  *     @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
+ *     LTTNG_KERNEL_ENABLE
+ *             Enable recording for this event (weak enable)
+ *     LTTNG_KERNEL_DISABLE
+ *             Disable recording for this event (strong disable)
  */
 static
 long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
@@ -625,6 +651,10 @@ long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                return lttng_abi_add_context(file,
                                (struct lttng_kernel_context __user *) arg,
                                &event->ctx, event->chan->session);
+       case LTTNG_KERNEL_ENABLE:
+               return ltt_event_enable(event);
+       case LTTNG_KERNEL_DISABLE:
+               return ltt_event_disable(event);
        default:
                return -ENOIOCTLCMD;
        }