ftrace: bin-output

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 50 insertions, 0 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index bebd263f582f..d78cbc4fc519 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -154,6 +154,7 @@ enum trace_iterator_flags {
         TRACE_ITER_SYM_ADDR             = 0x04,
         TRACE_ITER_VERBOSE              = 0x08,
         TRACE_ITER_RAW                  = 0x10,
+        TRACE_ITER_BIN                  = 0x20,
 };
 
 #define TRACE_ITER_SYM_MASK \
@@ -166,6 +167,7 @@ static const char *trace_options[] = {
         "sym-addr",
         "verbose",
         "raw",
+        "bin",
         NULL
 };
 
@@ -275,6 +277,18 @@ trace_seq_putc(struct trace_seq *s, unsigned char c)
         return 1;
 }
 
+static notrace int
+trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
+{
+        if (len > ((PAGE_SIZE - 1) - s->len))
+                return 0;
+
+        memcpy(s->buffer + s->len, mem, len);
+        s->len += len;
+
+        return len;
+}
+
 static notrace void
 trace_seq_reset(struct trace_seq *s)
 {
@@ -1261,6 +1275,39 @@ static notrace int print_raw_fmt(struct trace_iterator *iter)
         return 1;
 }
 
+#define SEQ_PUT_FIELD_RET(s, x)                         \
+do {                                                    \
+        if (!trace_seq_putmem(s, &(x), sizeof(x)))      \
+                return 0;                               \
+} while (0)
+
+static notrace int print_bin_fmt(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+        struct trace_entry *entry;
+
+        entry = iter->ent;
+
+        SEQ_PUT_FIELD_RET(s, entry->pid);
+        SEQ_PUT_FIELD_RET(s, entry->cpu);
+        SEQ_PUT_FIELD_RET(s, entry->t);
+
+        switch (entry->type) {
+        case TRACE_FN:
+                SEQ_PUT_FIELD_RET(s, entry->fn.ip);
+                SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip);
+                break;
+        case TRACE_CTX:
+                SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid);
+                SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio);
+                SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state);
+                SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid);
+                SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio);
+                break;
+        }
+        return 1;
+}
+
 static int trace_empty(struct trace_iterator *iter)
 {
         struct trace_array_cpu *data;
@@ -1279,6 +1326,9 @@ static int trace_empty(struct trace_iterator *iter)
 
 static int print_trace_line(struct trace_iterator *iter)
 {
+        if (trace_flags & TRACE_ITER_BIN)
+                return print_bin_fmt(iter);
+
         if (trace_flags & TRACE_ITER_RAW)
                 return print_raw_fmt(iter);