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| author | Torsten Duwe <duwe@lst.de> | 2014-06-14 23:48:41 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-07-15 04:49:40 -0400 |
| commit | 0f734e6e768b4b66737b3d3e13f1769a12ecff86 (patch) | |
| tree | 637eb77455b97fa9385a442a25406443a6bceda7 /include/linux/hw_random.h | |
| parent | be4000bc4644d027c519b6361f5ae3bbfc52c347 (diff) | |
| download | lwn-0f734e6e768b4b66737b3d3e13f1769a12ecff86.tar.gz lwn-0f734e6e768b4b66737b3d3e13f1769a12ecff86.zip | |
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 <duwe@suse.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include/linux/hw_random.h')
| -rw-r--r-- | include/linux/hw_random.h | 3 |
1 files changed, 3 insertions, 0 deletions
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; |