Implement filtering infrastructure

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

diff --git a/lttng-events.h b/lttng-events.h
index c360af0b0ebb7c7a659900fb18be0fea969f6ce3..d9fdd0cf091b117d68f5cfe0de0edf99af1c835a 100644 (file)
--- a/lttng-events.h
+++ b/lttng-events.h
@@ -140,6 +140,12 @@ struct lttng_event_field {
        struct lttng_type type;
 };
 
+union lttng_ctx_value {
+       int64_t s64;
+       const char *str;
+       double d;
+};
+
 /*
  * We need to keep this perf counter field separately from struct
  * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
@@ -157,6 +163,8 @@ struct lttng_ctx_field {
        void (*record)(struct lttng_ctx_field *field,
                       struct lib_ring_buffer_ctx *ctx,
                       struct lttng_channel *chan);
+       void (*get_value)(struct lttng_ctx_field *field,
+                        union lttng_ctx_value *value);
        union {
                struct lttng_perf_counter_field *perf_counter;
        } u;
@@ -196,6 +204,33 @@ enum lttng_event_type {
        LTTNG_TYPE_ENABLER = 1,
 };
 
+struct lttng_filter_bytecode_node {
+       struct list_head node;
+       struct lttng_enabler *enabler;
+       /*
+        * struct lttng_kernel_filter_bytecode has var. sized array, must be
+        * last field.
+        */
+       struct lttng_kernel_filter_bytecode bc;
+};
+
+/*
+ * Filter return value masks.
+ */
+enum lttng_filter_ret {
+       LTTNG_FILTER_DISCARD = 0,
+       LTTNG_FILTER_RECORD_FLAG = (1ULL << 0),
+       /* Other bits are kept for future use. */
+};
+
+struct lttng_bytecode_runtime {
+       /* Associated bytecode */
+       struct lttng_filter_bytecode_node *bc;
+       uint64_t (*filter)(void *filter_data, const char *filter_stack_data);
+       int link_failed;
+       struct list_head node;  /* list of bytecode runtime in event */
+};
+
 /*
  * Objects in a linked-list of enablers, owned by an event.
  */
@@ -237,6 +272,9 @@ struct lttng_event {
        struct list_head enablers_ref_head;
        struct hlist_node hlist;        /* session ht of events */
        int registered;                 /* has reg'd tracepoint probe */
+       /* list of struct lttng_bytecode_runtime, sorted by seqnum */
+       struct list_head bytecode_runtime_head;
+       int has_enablers_without_bytecode;
 };
 
 enum lttng_enabler_type {
@@ -254,6 +292,8 @@ struct lttng_enabler {
        enum lttng_enabler_type type;
 
        struct list_head node;  /* per-session list of enablers */
+       /* head list of struct lttng_ust_filter_bytecode_node */
+       struct list_head filter_bytecode_head;
 
        struct lttng_kernel_event event_param;
        struct lttng_channel *chan;
@@ -555,9 +595,18 @@ int lttng_abi_syscall_list(void)
 }
 #endif
 
+void lttng_filter_sync_state(struct lttng_bytecode_runtime *runtime);
+int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
+               struct lttng_kernel_filter_bytecode __user *bytecode);
+
+extern struct lttng_ctx *lttng_static_ctx;
+
+int lttng_context_init(void);
+void lttng_context_exit(void);
 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
 void lttng_context_update(struct lttng_ctx *ctx);
 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
+int lttng_get_context_index(struct lttng_ctx *ctx, const char *name);
 void lttng_remove_context_field(struct lttng_ctx **ctx,
                                struct lttng_ctx_field *field);
 void lttng_destroy_context(struct lttng_ctx *ctx);