random: add tracepoints for easier debugging and verification

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 134 insertions, 0 deletions

diff --git a/include/trace/events/random.h b/include/trace/events/random.h
new file mode 100644
index 000000000000..422df19de732
--- /dev/null
+++ b/include/trace/events/random.h
@@ -0,0 +1,134 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM random
+
+#if !defined(_TRACE_RANDOM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_RANDOM_H
+
+#include <linux/writeback.h>
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(random__mix_pool_bytes,
+        TP_PROTO(const char *pool_name, int bytes, unsigned long IP),
+
+        TP_ARGS(pool_name, bytes, IP),
+
+        TP_STRUCT__entry(
+                __field( const char *,  pool_name               )
+                __field(          int,  bytes                   )
+                __field(unsigned long,  IP                      )
+        ),
+
+        TP_fast_assign(
+                __entry->pool_name      = pool_name;
+                __entry->bytes          = bytes;
+                __entry->IP             = IP;
+        ),
+
+        TP_printk("%s pool: bytes %d caller %pF",
+                  __entry->pool_name, __entry->bytes, (void *)__entry->IP)
+);
+
+DEFINE_EVENT(random__mix_pool_bytes, mix_pool_bytes,
+        TP_PROTO(const char *pool_name, int bytes, unsigned long IP),
+
+        TP_ARGS(pool_name, bytes, IP)
+);
+
+DEFINE_EVENT(random__mix_pool_bytes, mix_pool_bytes_nolock,
+        TP_PROTO(const char *pool_name, int bytes, unsigned long IP),
+
+        TP_ARGS(pool_name, bytes, IP)
+);
+
+TRACE_EVENT(credit_entropy_bits,
+        TP_PROTO(const char *pool_name, int bits, int entropy_count,
+                 int entropy_total, unsigned long IP),
+
+        TP_ARGS(pool_name, bits, entropy_count, entropy_total, IP),
+
+        TP_STRUCT__entry(
+                __field( const char *,  pool_name               )
+                __field(          int,  bits                    )
+                __field(          int,  entropy_count           )
+                __field(          int,  entropy_total           )
+                __field(unsigned long,  IP                      )
+        ),
+
+        TP_fast_assign(
+                __entry->pool_name      = pool_name;
+                __entry->bits           = bits;
+                __entry->entropy_count  = entropy_count;
+                __entry->entropy_total  = entropy_total;
+                __entry->IP             = IP;
+        ),
+
+        TP_printk("%s pool: bits %d entropy_count %d entropy_total %d "
+                  "caller %pF", __entry->pool_name, __entry->bits,
+                  __entry->entropy_count, __entry->entropy_total,
+                  (void *)__entry->IP)
+);
+
+TRACE_EVENT(get_random_bytes,
+        TP_PROTO(int nbytes, unsigned long IP),
+
+        TP_ARGS(nbytes, IP),
+
+        TP_STRUCT__entry(
+                __field(          int,  nbytes                  )
+                __field(unsigned long,  IP                      )
+        ),
+
+        TP_fast_assign(
+                __entry->nbytes         = nbytes;
+                __entry->IP             = IP;
+        ),
+
+        TP_printk("nbytes %d caller %pF", __entry->nbytes, (void *)__entry->IP)
+);
+
+DECLARE_EVENT_CLASS(random__extract_entropy,
+        TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
+                 unsigned long IP),
+
+        TP_ARGS(pool_name, nbytes, entropy_count, IP),
+
+        TP_STRUCT__entry(
+                __field( const char *,  pool_name               )
+                __field(          int,  nbytes                  )
+                __field(          int,  entropy_count           )
+                __field(unsigned long,  IP                      )
+        ),
+
+        TP_fast_assign(
+                __entry->pool_name      = pool_name;
+                __entry->nbytes         = nbytes;
+                __entry->entropy_count  = entropy_count;
+                __entry->IP             = IP;
+        ),
+
+        TP_printk("%s pool: nbytes %d entropy_count %d caller %pF",
+                  __entry->pool_name, __entry->nbytes, __entry->entropy_count,
+                  (void *)__entry->IP)
+);
+
+
+DEFINE_EVENT(random__extract_entropy, extract_entropy,
+        TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
+                 unsigned long IP),
+
+        TP_ARGS(pool_name, nbytes, entropy_count, IP)
+);
+
+DEFINE_EVENT(random__extract_entropy, extract_entropy_user,
+        TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
+                 unsigned long IP),
+
+        TP_ARGS(pool_name, nbytes, entropy_count, IP)
+);
+
+
+
+#endif /* _TRACE_RANDOM_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>