ftrace: introduce the "hex" output method

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

1 files changed, 92 insertions, 1 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 71b25b79b3de..6974b212e938 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -103,7 +103,8 @@ enum trace_iterator_flags {
         TRACE_ITER_SYM_ADDR             = 0x04,
         TRACE_ITER_VERBOSE              = 0x08,
         TRACE_ITER_RAW                  = 0x10,
-        TRACE_ITER_BIN                  = 0x20,
+        TRACE_ITER_HEX                  = 0x20,
+        TRACE_ITER_BIN                  = 0x40,
 };
 
 #define TRACE_ITER_SYM_MASK \
@@ -116,6 +117,7 @@ static const char *trace_options[] = {
         "sym-addr",
         "verbose",
         "raw",
+        "hex",
         "bin",
         NULL
 };
@@ -238,6 +240,47 @@ trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
         return len;
 }
 
+#define HEX_CHARS 17
+
+static notrace int
+trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
+{
+        unsigned char hex[HEX_CHARS];
+        unsigned char *data;
+        unsigned char byte;
+        int i, j;
+
+        BUG_ON(len >= HEX_CHARS);
+
+        data = mem;
+
+#ifdef __BIG_ENDIAN
+        for (i = 0, j = 0; i < len; i++) {
+#else
+        for (i = len-1, j = 0; i >= 0; i--) {
+#endif
+                byte = data[i];
+
+                hex[j]   = byte & 0x0f;
+                if (hex[j] >= 10)
+                        hex[j] += 'a' - 10;
+                else
+                        hex[j] += '0';
+                j++;
+
+                hex[j] = byte >> 4;
+                if (hex[j] >= 10)
+                        hex[j] += 'a' - 10;
+                else
+                        hex[j] += '0';
+                j++;
+        }
+        hex[j] = ' ';
+        j++;
+
+        return trace_seq_putmem(s, hex, j);
+}
+
 static notrace void
 trace_seq_reset(struct trace_seq *s)
 {
@@ -1274,6 +1317,51 @@ do {							\
                 return 0;                               \
 } while (0)
 
+#define SEQ_PUT_HEX_FIELD_RET(s, x)                     \
+do {                                                    \
+        if (!trace_seq_putmem_hex(s, &(x), sizeof(x)))  \
+                return 0;                               \
+} while (0)
+
+static notrace int print_hex_fmt(struct trace_iterator *iter)
+{
+        struct trace_seq *s = &iter->seq;
+        unsigned char newline = '\n';
+        struct trace_entry *entry;
+        int S;
+
+        entry = iter->ent;
+
+        SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
+        SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
+        SEQ_PUT_HEX_FIELD_RET(s, entry->t);
+
+        switch (entry->type) {
+        case TRACE_FN:
+                SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip);
+                SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip);
+                break;
+        case TRACE_CTX:
+                S = entry->ctx.prev_state < sizeof(state_to_char) ?
+                        state_to_char[entry->ctx.prev_state] : 'X';
+                SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid);
+                SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio);
+                SEQ_PUT_HEX_FIELD_RET(s, S);
+                SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid);
+                SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio);
+                SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip);
+                break;
+        case TRACE_SPECIAL:
+                SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1);
+                SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2);
+                SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3);
+                break;
+        }
+        SEQ_PUT_FIELD_RET(s, newline);
+
+        return 1;
+}
+
 static notrace int print_bin_fmt(struct trace_iterator *iter)
 {
         struct trace_seq *s = &iter->seq;
@@ -1327,6 +1415,9 @@ 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_HEX)
+                return print_hex_fmt(iter);
+
         if (trace_flags & TRACE_ITER_RAW)
                 return print_raw_fmt(iter);