From 0f734e6e768b4b66737b3d3e13f1769a12ecff86 Mon Sep 17 00:00:00 2001 From: Torsten Duwe Date: Sat, 14 Jun 2014 23:48:41 -0400 Subject: hwrng: add per-device entropy derating This patch introduces a derating factor to struct hwrng for the random bits going into the kernel input pool, and a common default derating for drivers which do not specify one. Signed-off-by: Torsten Duwe Signed-off-by: Theodore Ts'o Acked-by: H. Peter Anvin --- include/linux/hw_random.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include') diff --git a/include/linux/hw_random.h b/include/linux/hw_random.h index 3f075ff00411..914bb08cd738 100644 --- a/include/linux/hw_random.h +++ b/include/linux/hw_random.h @@ -29,6 +29,8 @@ * @read: New API. drivers can fill up to max bytes of data * into the buffer. The buffer is aligned for any type. * @priv: Private data, for use by the RNG driver. + * @quality: Estimation of true entropy in RNG's bitstream + * (per mill). */ struct hwrng { const char *name; @@ -38,6 +40,7 @@ struct hwrng { int (*data_read)(struct hwrng *rng, u32 *data); int (*read)(struct hwrng *rng, void *data, size_t max, bool wait); unsigned long priv; + unsigned short quality; /* internal. */ struct list_head list; -- cgit v1.2.3