coresight: enable stm logging for trace events, marker and printk

Dup ftrace event traffic and writes to trace_marker file from
userspace to STM. Also dup trace printk traffic to STM. This
allows Linux tracing and log data to be correlated with other
data transported over STM.

Change-Id: I4fcb42f2e97ab963fdc85853f4f3ea1f208bfc3c
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
[spjoshi@codeaurora.org: 3.18 code fixup]
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>
[mittals@codeaurora.org: 4.4 code fixup]
Signed-off-by: Shashank Mittal <mittals@codeaurora.org>
[sadesai@codeaurora.org: 4.8 code fixup]
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>
Signed-off-by: Rama Aparna Mallavarapu <aparnam@codeaurora.org>

include/linux/trace_events.h

@@ -9,6 +9,7 @@
 #include <linux/hardirq.h>
 #include <linux/perf_event.h>
 #include <linux/tracepoint.h>
+#include <linux/coresight-stm.h>
 
 struct trace_array;
 struct trace_buffer;
@@ -216,7 +217,8 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
 				  struct trace_event_file *trace_file,
 				  unsigned long len);
 
-void trace_event_buffer_commit(struct trace_event_buffer *fbuffer);
+void trace_event_buffer_commit(struct trace_event_buffer *fbuffer,
+			       unsigned long len);
 
 enum {
 	TRACE_EVENT_FL_FILTERED_BIT,

include/trace/trace_events.h

@@ -719,7 +719,8 @@ trace_event_raw_event_##call(void *__data, proto)			\
 									\
 	{ assign; }							\
 									\
-	trace_event_buffer_commit(&fbuffer);				\
+	trace_event_buffer_commit(&fbuffer,				\
+				  sizeof(*entry) + __data_size);	\
 }
 /*
  * The ftrace_test_probe is compiled out, it is only here as a build time check

kernel/trace/trace.c

@@ -44,6 +44,7 @@
 #include <linux/trace.h>
 #include <linux/sched/clock.h>
 #include <linux/sched/rt.h>
+#include <linux/coresight-stm.h>
 
 #include "trace.h"
 #include "trace_output.h"
@@ -2376,14 +2377,15 @@ int tracepoint_printk_sysctl(struct ctl_table *table, int write,
 	return ret;
 }
 
-void trace_event_buffer_commit(struct trace_event_buffer *fbuffer)
+void trace_event_buffer_commit(struct trace_event_buffer *fbuffer,
+			       unsigned long len)
 {
 	if (static_key_false(&tracepoint_printk_key.key))
 		output_printk(fbuffer);
 
 	event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer,
 				    fbuffer->event, fbuffer->entry,
-				    fbuffer->flags, fbuffer->pc);
+				    fbuffer->flags, fbuffer->pc, len);
 }
 EXPORT_SYMBOL_GPL(trace_event_buffer_commit);
 
@@ -3001,6 +3003,7 @@ __trace_array_vprintk(struct ring_buffer *buffer,
 
 	memcpy(&entry->buf, tbuffer, len + 1);
 	if (!call_filter_check_discard(call, entry, buffer, event)) {
+		stm_log(OST_ENTITY_TRACE_PRINTK, entry->buf, len + 1);
 		__buffer_unlock_commit(buffer, event);
 		ftrace_trace_stack(&global_trace, buffer, flags, 6, pc, NULL);
 	}
@@ -6137,8 +6140,11 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
 	if (entry->buf[cnt - 1] != '\n') {
 		entry->buf[cnt] = '\n';
 		entry->buf[cnt + 1] = '\0';
-	} else
+		stm_log(OST_ENTITY_TRACE_MARKER, entry->buf, cnt + 2);
+	} else {
 		entry->buf[cnt] = '\0';
+		stm_log(OST_ENTITY_TRACE_MARKER, entry->buf, cnt + 1);
+	}
 
 	__buffer_unlock_commit(buffer, event);
 

kernel/trace/trace.h

@@ -1315,6 +1315,7 @@ __event_trigger_test_discard(struct trace_event_file *file,
  * @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.
+ * @len: The length of the payload data required for stm logging.
  *
  * This is a helper function to handle triggers that require data
  * from the event itself. It also tests the event against filters and
@@ -1324,12 +1325,17 @@ static inline void
 event_trigger_unlock_commit(struct trace_event_file *file,
 			    struct ring_buffer *buffer,
 			    struct ring_buffer_event *event,
-			    void *entry, unsigned long irq_flags, int pc)
+			    void *entry, unsigned long irq_flags, int pc,
+			    unsigned long len)
 {
 	enum event_trigger_type tt = ETT_NONE;
 
-	if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
+	if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) {
+		if (len)
+			stm_log(OST_ENTITY_FTRACE_EVENTS, entry, len);
+
 		trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
+	}
 
 	if (tt)
 		event_triggers_post_call(file, tt);

kernel/trace/trace_syscalls.c

@@ -350,7 +350,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
 	syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args);
 
 	event_trigger_unlock_commit(trace_file, buffer, event, entry,
-				    irq_flags, pc);
+				    irq_flags, pc, 0);
 }
 
 static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
@@ -396,7 +396,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
 	entry->ret = syscall_get_return_value(current, regs);
 
 	event_trigger_unlock_commit(trace_file, buffer, event, entry,
-				    irq_flags, pc);
+				    irq_flags, pc, 0);
 }
 
 static int reg_event_syscall_enter(struct trace_event_file *file,

kernel/trace/trace_uprobe.c

@@ -793,7 +793,7 @@ static void __uprobe_trace_func(struct trace_uprobe *tu,
 
 	memcpy(data, ucb->buf, tu->tp.size + dsize);
 
-	event_trigger_unlock_commit(trace_file, buffer, event, entry, 0, 0);
+	event_trigger_unlock_commit(trace_file, buffer, event, entry, 0, 0, 0);
 }
 
 /* uprobe handler */