+
#ifndef _LINUX_FTRACE_EVENT_H
#define _LINUX_FTRACE_EVENT_H
FTRACE_EVENT_FL_NO_SET_FILTER_BIT,
FTRACE_EVENT_FL_SOFT_MODE_BIT,
FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
+ FTRACE_EVENT_FL_TRIGGER_MODE_BIT,
+ FTRACE_EVENT_FL_TRIGGER_COND_BIT,
};
/*
* SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED
* SOFT_DISABLED - When set, do not trace the event (even though its
* tracepoint may be enabled)
+ * TRIGGER_MODE - When set, invoke the triggers associated with the event
+ * TRIGGER_COND - When set, one or more triggers has an associated filter
*/
enum {
FTRACE_EVENT_FL_ENABLED = (1 << FTRACE_EVENT_FL_ENABLED_BIT),
FTRACE_EVENT_FL_NO_SET_FILTER = (1 << FTRACE_EVENT_FL_NO_SET_FILTER_BIT),
FTRACE_EVENT_FL_SOFT_MODE = (1 << FTRACE_EVENT_FL_SOFT_MODE_BIT),
FTRACE_EVENT_FL_SOFT_DISABLED = (1 << FTRACE_EVENT_FL_SOFT_DISABLED_BIT),
+ FTRACE_EVENT_FL_TRIGGER_MODE = (1 << FTRACE_EVENT_FL_TRIGGER_MODE_BIT),
+ FTRACE_EVENT_FL_TRIGGER_COND = (1 << FTRACE_EVENT_FL_TRIGGER_COND_BIT),
};
struct ftrace_event_file {
struct dentry *dir;
struct trace_array *tr;
struct ftrace_subsystem_dir *system;
+ struct list_head triggers;
/*
* 32 bit flags:
* bit 1: enabled cmd record
* bit 2: enable/disable with the soft disable bit
* bit 3: soft disabled
+ * bit 4: trigger enabled
*
* Note: The bits must be set atomically to prevent races
* from other writers. Reads of flags do not need to be in
*/
unsigned long flags;
atomic_t sm_ref; /* soft-mode reference counter */
+ atomic_t tm_ref; /* trigger-mode reference counter */
};
#define __TRACE_EVENT_FLAGS(name, value) \
#define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
+enum event_trigger_type {
+ ETT_NONE = (0),
+ ETT_TRACE_ONOFF = (1 << 0),
+ ETT_SNAPSHOT = (1 << 1),
+ ETT_STACKTRACE = (1 << 2),
+ ETT_EVENT_ENABLE = (1 << 3),
+};
+
extern void destroy_preds(struct ftrace_event_file *file);
extern void destroy_call_preds(struct ftrace_event_call *call);
extern int filter_match_preds(struct event_filter *filter, void *rec);
extern int call_filter_check_discard(struct ftrace_event_call *call, void *rec,
struct ring_buffer *buffer,
struct ring_buffer_event *event);
+extern enum event_trigger_type event_triggers_call(struct ftrace_event_file *file,
+ void *rec);
+extern void event_triggers_post_call(struct ftrace_event_file *file,
+ enum event_trigger_type tt);
+
+/**
+ * ftrace_trigger_soft_disabled - do triggers and test if soft disabled
+ * @file: The file pointer of the event to test
+ *
+ * If any triggers without filters are attached to this event, they
+ * will be called here. If the event is soft disabled and has no
+ * triggers that require testing the fields, it will return true,
+ * otherwise false.
+ */
+static inline bool
+ftrace_trigger_soft_disabled(struct ftrace_event_file *file)
+{
+ unsigned long eflags = file->flags;
+
+ if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
+ if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
+ event_triggers_call(file, NULL);
+ if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
+ return true;
+ }
+ return false;
+}
+
+/*
+ * Helper function for event_trigger_unlock_commit{_regs}().
+ * If there are event triggers attached to this event that requires
+ * filtering against its fields, then they wil be called as the
+ * entry already holds the field information of the current event.
+ *
+ * It also checks if the event should be discarded or not.
+ * It is to be discarded if the event is soft disabled and the
+ * event was only recorded to process triggers, or if the event
+ * filter is active and this event did not match the filters.
+ *
+ * Returns true if the event is discarded, false otherwise.
+ */
+static inline bool
+__event_trigger_test_discard(struct ftrace_event_file *file,
+ struct ring_buffer *buffer,
+ struct ring_buffer_event *event,
+ void *entry,
+ enum event_trigger_type *tt)
+{
+ unsigned long eflags = file->flags;
+
+ if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
+ *tt = event_triggers_call(file, entry);
+
+ if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags))
+ ring_buffer_discard_commit(buffer, event);
+ else if (!filter_check_discard(file, entry, buffer, event))
+ return false;
+
+ return true;
+}
+
+/**
+ * event_trigger_unlock_commit - handle triggers and finish event commit
+ * @file: The file pointer assoctiated to the event
+ * @buffer: The ring buffer that the event is being written to
+ * @event: The event meta data in the ring buffer
+ * @entry: The event itself
+ * @irq_flags: The state of the interrupts at the start of the event
+ * @pc: The state of the preempt count at the start of the event.
+ *
+ * This is a helper function to handle triggers that require data
+ * from the event itself. It also tests the event against filters and
+ * if the event is soft disabled and should be discarded.
+ */
+static inline void
+event_trigger_unlock_commit(struct ftrace_event_file *file,
+ struct ring_buffer *buffer,
+ struct ring_buffer_event *event,
+ void *entry, unsigned long irq_flags, int pc)
+{
+ enum event_trigger_type tt = ETT_NONE;
+
+ if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
+ trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
+
+ if (tt)
+ event_triggers_post_call(file, tt);
+}
+
+/**
+ * event_trigger_unlock_commit_regs - handle triggers and finish event commit
+ * @file: The file pointer assoctiated to the event
+ * @buffer: The ring buffer that the event is being written to
+ * @event: The event meta data in the ring buffer
+ * @entry: The event itself
+ * @irq_flags: The state of the interrupts at the start of the event
+ * @pc: The state of the preempt count at the start of the event.
+ *
+ * This is a helper function to handle triggers that require data
+ * from the event itself. It also tests the event against filters and
+ * if the event is soft disabled and should be discarded.
+ *
+ * Same as event_trigger_unlock_commit() but calls
+ * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
+ */
+static inline void
+event_trigger_unlock_commit_regs(struct ftrace_event_file *file,
+ struct ring_buffer *buffer,
+ struct ring_buffer_event *event,
+ void *entry, unsigned long irq_flags, int pc,
+ struct pt_regs *regs)
+{
+ enum event_trigger_type tt = ETT_NONE;
+
+ if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
+ trace_buffer_unlock_commit_regs(buffer, event,
+ irq_flags, pc, regs);
+
+ if (tt)
+ event_triggers_post_call(file, tt);
+}
enum {
FILTER_OTHER = 0,
FILTER_TRACE_FN,
};
-#define EVENT_STORAGE_SIZE 128
-extern struct mutex event_storage_mutex;
-extern char event_storage[EVENT_STORAGE_SIZE];
-
extern int trace_event_raw_init(struct ftrace_event_call *call);
extern int trace_define_field(struct ftrace_event_call *call, const char *type,
const char *name, int offset, int size,
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