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authorTorsten Duwe <duwe@lst.de>2014-06-14 23:48:41 -0400
committerTheodore Ts'o <tytso@mit.edu>2014-07-15 04:49:40 -0400
commit0f734e6e768b4b66737b3d3e13f1769a12ecff86 (patch)
tree637eb77455b97fa9385a442a25406443a6bceda7 /include/linux/hw_random.h
parentbe4000bc4644d027c519b6361f5ae3bbfc52c347 (diff)
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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.h3
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;