add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/kernel/trace/trace.h
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@@ -136,6 +136,25 @@
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 	unsigned long		ret_ip;
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 };
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+/*
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+ * trace_flag_type is an enumeration that holds different
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+ * states when a trace occurs. These are:
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+ *  IRQS_OFF		- interrupts were disabled
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+ *  IRQS_NOSUPPORT	- arch does not support irqs_disabled_flags
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+ *  NEED_RESCHED	- reschedule is requested
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+ *  HARDIRQ		- inside an interrupt handler
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+ *  SOFTIRQ		- inside a softirq handler
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+ */
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+enum trace_flag_type {
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+	TRACE_FLAG_IRQS_OFF		= 0x01,
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+	TRACE_FLAG_IRQS_NOSUPPORT	= 0x02,
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+	TRACE_FLAG_NEED_RESCHED		= 0x04,
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+	TRACE_FLAG_HARDIRQ		= 0x08,
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+	TRACE_FLAG_SOFTIRQ		= 0x10,
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+	TRACE_FLAG_PREEMPT_RESCHED	= 0x20,
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+	TRACE_FLAG_NMI			= 0x40,
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+};
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+
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 #define TRACE_BUF_SIZE		1024
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 struct trace_array;
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@@ -706,8 +725,11 @@
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 void tracing_reset_online_cpus(struct array_buffer *buf);
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 void tracing_reset_current(int cpu);
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 void tracing_reset_all_online_cpus(void);
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+void tracing_reset_all_online_cpus_unlocked(void);
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 int tracing_open_generic(struct inode *inode, struct file *filp);
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 int tracing_open_generic_tr(struct inode *inode, struct file *filp);
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+int tracing_open_file_tr(struct inode *inode, struct file *filp);
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+int tracing_release_file_tr(struct inode *inode, struct file *filp);
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 bool tracing_is_disabled(void);
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 bool tracer_tracing_is_on(struct trace_array *tr);
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 void tracer_tracing_on(struct trace_array *tr);
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@@ -726,7 +748,8 @@
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 trace_buffer_lock_reserve(struct trace_buffer *buffer,
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 			  int type,
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 			  unsigned long len,
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-			  unsigned int trace_ctx);
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+			  unsigned long flags,
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+			  int pc);
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 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
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 						struct trace_array_cpu *data);
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@@ -751,11 +774,11 @@
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 void trace_function(struct trace_array *tr,
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 		    unsigned long ip,
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 		    unsigned long parent_ip,
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-		    unsigned int trace_ctx);
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+		    unsigned long flags, int pc);
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 void trace_graph_function(struct trace_array *tr,
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 		    unsigned long ip,
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 		    unsigned long parent_ip,
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-		    unsigned int trace_ctx);
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+		    unsigned long flags, int pc);
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 void trace_latency_header(struct seq_file *m);
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 void trace_default_header(struct seq_file *m);
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 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
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@@ -823,10 +846,11 @@
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 #endif
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 #ifdef CONFIG_STACKTRACE
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-void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
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+void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
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+		   int pc);
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 #else
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-static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
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-				 int skip)
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+static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
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+				 int skip, int pc)
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 {
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 }
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 #endif /* CONFIG_STACKTRACE */
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@@ -966,10 +990,10 @@
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 extern void graph_trace_close(struct trace_iterator *iter);
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 extern int __trace_graph_entry(struct trace_array *tr,
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 			       struct ftrace_graph_ent *trace,
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-			       unsigned int trace_ctx);
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+			       unsigned long flags, int pc);
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 extern void __trace_graph_return(struct trace_array *tr,
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 				 struct ftrace_graph_ret *trace,
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-				 unsigned int trace_ctx);
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+				 unsigned long flags, int pc);
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 #ifdef CONFIG_DYNAMIC_FTRACE
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 extern struct ftrace_hash __rcu *ftrace_graph_hash;
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@@ -1432,15 +1456,15 @@
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 void trace_buffer_unlock_commit_regs(struct trace_array *tr,
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 				     struct trace_buffer *buffer,
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 				     struct ring_buffer_event *event,
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-				     unsigned int trcace_ctx,
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+				     unsigned long flags, int pc,
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 				     struct pt_regs *regs);
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 static inline void trace_buffer_unlock_commit(struct trace_array *tr,
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 					      struct trace_buffer *buffer,
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 					      struct ring_buffer_event *event,
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-					      unsigned int trace_ctx)
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+					      unsigned long flags, int pc)
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 {
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-	trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
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+	trace_buffer_unlock_commit_regs(tr, buffer, event, flags, pc, NULL);
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 }
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 DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
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@@ -1513,7 +1537,8 @@
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  * @buffer: The ring buffer that the event is being written to
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  * @event: The event meta data in the ring buffer
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  * @entry: The event itself
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- * @trace_ctx: The tracing context flags.
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+ * @irq_flags: The state of the interrupts at the start of the event
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+ * @pc: The state of the preempt count at the start of the event.
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  *
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  * This is a helper function to handle triggers that require data
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  * from the event itself. It also tests the event against filters and
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@@ -1523,12 +1548,12 @@
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 event_trigger_unlock_commit(struct trace_event_file *file,
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 			    struct trace_buffer *buffer,
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 			    struct ring_buffer_event *event,
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-			    void *entry, unsigned int trace_ctx)
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+			    void *entry, unsigned long irq_flags, int pc)
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 {
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 	enum event_trigger_type tt = ETT_NONE;
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 	if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
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-		trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
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+		trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
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 	if (tt)
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 		event_triggers_post_call(file, tt);
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@@ -1540,7 +1565,8 @@
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  * @buffer: The ring buffer that the event is being written to
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  * @event: The event meta data in the ring buffer
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  * @entry: The event itself
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- * @trace_ctx: The tracing context flags.
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+ * @irq_flags: The state of the interrupts at the start of the event
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+ * @pc: The state of the preempt count at the start of the event.
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  *
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  * This is a helper function to handle triggers that require data
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  * from the event itself. It also tests the event against filters and
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@@ -1553,14 +1579,14 @@
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 event_trigger_unlock_commit_regs(struct trace_event_file *file,
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 				 struct trace_buffer *buffer,
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 				 struct ring_buffer_event *event,
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-				 void *entry, unsigned int trace_ctx,
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+				 void *entry, unsigned long irq_flags, int pc,
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 				 struct pt_regs *regs)
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 {
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 	enum event_trigger_type tt = ETT_NONE;
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 	if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
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 		trace_buffer_unlock_commit_regs(file->tr, buffer, event,
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-						trace_ctx, regs);
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+						irq_flags, pc, regs);
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 	if (tt)
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 		event_triggers_post_call(file, tt);
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@@ -1650,6 +1676,7 @@
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 extern void trace_event_enable_tgid_record(bool enable);
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 extern int event_trace_init(void);
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+extern int init_events(void);
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 extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
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 extern int event_trace_del_tracer(struct trace_array *tr);
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 extern void __trace_early_add_events(struct trace_array *tr);