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random: fix the tracepoint for get_random_bytes(_arch) 

Fix a problem where get_random_bytes_arch() was calling the tracepoint
get_random_bytes().  So add a new tracepoint for
get_random_bytes_arch(), and make get_random_bytes() and
get_random_bytes_arch() call their correct tracepoint.

Also, add a new tracepoint for add_device_randomness()

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2013-09-12 14:10:25 -04:00
parent 30e37ec516
commit 5910895f0e
2 changed files with 35 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/char/random.c
View File

@ -711,6 +711,7 @@ void add_device_randomness(const void *buf, unsigned int size)
{
unsigned long time = random_get_entropy() ^ jiffies;
trace_add_device_randomness(size, _RET_IP_);
mix_pool_bytes(&input_pool, buf, size, NULL);
mix_pool_bytes(&input_pool, &time, sizeof(time), NULL);
mix_pool_bytes(&nonblocking_pool, buf, size, NULL);
@ -1127,6 +1128,7 @@ static ssize_t extract_entropy_user(struct entropy_store *r, void __user *buf,
*/
void get_random_bytes(void *buf, int nbytes)
{
trace_get_random_bytes(nbytes, _RET_IP_);
extract_entropy(&nonblocking_pool, buf, nbytes, 0, 0);
}
EXPORT_SYMBOL(get_random_bytes);
@ -1145,7 +1147,7 @@ void get_random_bytes_arch(void *buf, int nbytes)
{
char *p = buf;
trace_get_random_bytes(nbytes, _RET_IP_);
trace_get_random_bytes_arch(nbytes, _RET_IP_);
while (nbytes) {
unsigned long v;
int chunk = min(nbytes, (int)sizeof(unsigned long));

33
include/trace/events/random.h
View File

@ -7,6 +7,25 @@
#include <linux/writeback.h>
#include <linux/tracepoint.h>
TRACE_EVENT(add_device_randomness,
TP_PROTO(int bytes, unsigned long IP),
TP_ARGS(bytes, IP),
TP_STRUCT__entry(
__field( int, bytes )
__field(unsigned long, IP )
),
TP_fast_assign(
__entry->bytes = bytes;
__entry->IP = IP;
),
TP_printk("bytes %d caller %pF",
__entry->bytes, (void *)__entry->IP)
);
DECLARE_EVENT_CLASS(random__mix_pool_bytes,
TP_PROTO(const char *pool_name, int bytes, unsigned long IP),
@ -68,7 +87,7 @@ TRACE_EVENT(credit_entropy_bits,
(void *)__entry->IP)
);
TRACE_EVENT(get_random_bytes,
DECLARE_EVENT_CLASS(random__get_random_bytes,
TP_PROTO(int nbytes, unsigned long IP),
TP_ARGS(nbytes, IP),
@ -86,6 +105,18 @@ TRACE_EVENT(get_random_bytes,
TP_printk("nbytes %d caller %pF", __entry->nbytes, (void *)__entry->IP)
);
DEFINE_EVENT(random__get_random_bytes, get_random_bytes,
TP_PROTO(int nbytes, unsigned long IP),
TP_ARGS(nbytes, IP)
);
DEFINE_EVENT(random__get_random_bytes, get_random_bytes_arch,
TP_PROTO(int nbytes, unsigned long IP),
TP_ARGS(nbytes, IP)
);
DECLARE_EVENT_CLASS(random__extract_entropy,
TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
unsigned long IP),