Add support for kvm x86 specific tracepoints

[lttng-modules.git] / lttng-events.h

diff --git a/lttng-events.h b/lttng-events.h
index 37a5db71e5bc1f7543a1a3f2efb3ae0b412c3413..46d80bcdb0edcd1a6d3599e7f630f240ecb28b0f 100644 (file)
--- a/lttng-events.h
+++ b/lttng-events.h
@@ -26,6 +26,7 @@
 #include <linux/version.h>
 #include <linux/list.h>
 #include <linux/kprobes.h>
+#include <linux/kref.h>
 #include "wrapper/uuid.h"
 #include "lttng-abi.h"
 #include "lttng-abi-old.h"
@@ -34,6 +35,7 @@
 
 struct lttng_channel;
 struct lttng_session;
+struct lttng_metadata_cache;
 struct lib_ring_buffer_ctx;
 struct perf_event;
 struct perf_event_attr;
@@ -58,6 +60,11 @@ enum lttng_string_encodings {
        NR_STRING_ENCODINGS,
 };
 
+enum channel_type {
+       PER_CPU_CHANNEL,
+       METADATA_CHANNEL,
+};
+
 struct lttng_enum_entry {
        unsigned long long start, end;  /* start and end are inclusive */
        const char *string;
@@ -264,39 +271,60 @@ struct lttng_channel {
        struct lttng_event *sc_compat_unknown;
        struct lttng_event *sc_exit;    /* for syscall exit */
        int header_type;                /* 0: unset, 1: compact, 2: large */
+       enum channel_type channel_type;
        unsigned int metadata_dumped:1;
 };
 
+struct lttng_metadata_stream {
+       void *priv;                     /* Ring buffer private data */
+       struct lttng_metadata_cache *metadata_cache;
+       unsigned int metadata_cache_read; /* Bytes read from the cache */
+       int finalized;                  /* Has channel been finalized */
+       wait_queue_head_t read_wait;    /* Reader buffer-level wait queue */
+       struct list_head list;          /* Stream list */
+};
+
 struct lttng_session {
        int active;                     /* Is trace session active ? */
        int been_active;                /* Has trace session been active ? */
        struct file *file;              /* File associated to session */
-       struct lttng_channel *metadata; /* Metadata channel */
        struct list_head chan;          /* Channel list head */
        struct list_head events;        /* Event list head */
        struct list_head list;          /* Session list */
        unsigned int free_chan_id;      /* Next chan ID to allocate */
        uuid_le uuid;                   /* Trace session unique ID */
+       struct lttng_metadata_cache *metadata_cache;
        unsigned int metadata_dumped:1;
 };
 
+struct lttng_metadata_cache {
+       char *data;                     /* Metadata cache */
+       unsigned int cache_alloc;       /* Metadata allocated size (bytes) */
+       unsigned int metadata_written;  /* Number of bytes written in metadata cache */
+       struct kref refcount;           /* Metadata cache usage */
+       struct list_head metadata_stream;       /* Metadata stream list */
+};
+
 struct lttng_session *lttng_session_create(void);
 int lttng_session_enable(struct lttng_session *session);
 int lttng_session_disable(struct lttng_session *session);
 void lttng_session_destroy(struct lttng_session *session);
+void metadata_cache_destroy(struct kref *kref);
 
 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
                                       const char *transport_name,
                                       void *buf_addr,
                                       size_t subbuf_size, size_t num_subbuf,
                                       unsigned int switch_timer_interval,
-                                      unsigned int read_timer_interval);
+                                      unsigned int read_timer_interval,
+                                      enum channel_type channel_type);
 struct lttng_channel *lttng_global_channel_create(struct lttng_session *session,
                                       int overwrite, void *buf_addr,
                                       size_t subbuf_size, size_t num_subbuf,
                                       unsigned int switch_timer_interval,
                                       unsigned int read_timer_interval);
 
+void lttng_metadata_channel_destroy(struct lttng_channel *chan);
 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
                                   struct lttng_kernel_event *event_param,
                                   void *filter,
@@ -327,6 +355,9 @@ void lttng_event_put(const struct lttng_event_desc *desc);
 int lttng_probes_init(void);
 void lttng_probes_exit(void);
 
+int lttng_metadata_output_channel(struct lttng_channel *chan,
+               struct lttng_metadata_stream *stream);
+
 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 int lttng_syscalls_unregister(struct lttng_channel *chan);