powerpc: Use hardware RNG for arch_get_random_seed_* not arch_get_random_*

The hardware RNG on POWER8 and POWER7+ can be relatively slow, since
it can only supply one 64-bit value per microsecond.  Currently we
read it in arch_get_random_long(), but that slows down reading from
/dev/urandom since the code in random.c calls arch_get_random_long()
for every longword read from /dev/urandom.

Since the hardware RNG supplies high-quality entropy on every read, it
matches the semantics of arch_get_random_seed_long() better than those
of arch_get_random_long().  Therefore this commit makes the code use
the POWER8/7+ hardware RNG only for arch_get_random_seed_{long,int}
and not for arch_get_random_{long,int}.

This won't affect any other PowerPC-based platforms because none of
them currently support a hardware RNG.  To make it clear that the
ppc_md function pointer is used for arch_get_random_seed_*, we rename
it from get_random_long to get_random_seed.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 14 insertions, 14 deletions

diff --git a/arch/powerpc/include/asm/archrandom.h b/arch/powerpc/include/asm/archrandom.h
index 0cc6eedc4780..85e88f7a59c0 100644
--- a/arch/powerpc/include/asm/archrandom.h
+++ b/arch/powerpc/include/asm/archrandom.h
@@ -7,14 +7,23 @@
 
 static inline int arch_get_random_long(unsigned long *v)
 {
-	if (ppc_md.get_random_long)
-		return ppc_md.get_random_long(v);
-
 	return 0;
 }
 
 static inline int arch_get_random_int(unsigned int *v)
 {
+	return 0;
+}
+
+static inline int arch_get_random_seed_long(unsigned long *v)
+{
+	if (ppc_md.get_random_seed)
+		return ppc_md.get_random_seed(v);
+
+	return 0;
+}
+static inline int arch_get_random_seed_int(unsigned int *v)
+{
 	unsigned long val;
 	int rc;
 
@@ -27,22 +36,13 @@ static inline int arch_get_random_int(unsigned int *v)
 
 static inline int arch_has_random(void)
 {
-	return !!ppc_md.get_random_long;
-}
-
-static inline int arch_get_random_seed_long(unsigned long *v)
-{
-	return 0;
-}
-static inline int arch_get_random_seed_int(unsigned int *v)
-{
 	return 0;
 }
+
 static inline int arch_has_random_seed(void)
 {
-	return 0;
+	return !!ppc_md.get_random_seed;
 }
-
 #endif /* CONFIG_ARCH_RANDOM */
 
 #ifdef CONFIG_PPC_POWERNV