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authorLinus Torvalds <torvalds@linux-foundation.org>2020-04-05 10:59:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-05 10:59:18 -0700
commit31c0aa87ec8a30b1e9e4cf862905a369560f7705 (patch)
tree0bdbff8a5adf82925fff819bd1d12a9696387a49 /arch/arm64/include
parent9c94b39560c3a013de5886ea21ef1eaf21840cb9 (diff)
parentab9a7e27044b87ff2be47b8f8e095400e7fccc44 (diff)
downloadlinux-31c0aa87ec8a30b1e9e4cf862905a369560f7705.tar.bz2
Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random
Pull /dev/random updates from Ted Ts'o: - Improve getrandom and /dev/random's support for those arm64 architecture variants that have RNG instructions. - Use batched output from CRNG instead of CPU's RNG instructions for better performance. - Miscellaneous bug fixes. * tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random: random: avoid warnings for !CONFIG_NUMA builds random: fix data races at timer_rand_state random: always use batched entropy for get_random_u{32,64} random: Make RANDOM_TRUST_CPU depend on ARCH_RANDOM arm64: add credited/trusted RNG support random: add arch_get_random_*long_early() random: split primary/secondary crng init paths
Diffstat (limited to 'arch/arm64/include')
-rw-r--r--arch/arm64/include/asm/archrandom.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/archrandom.h b/arch/arm64/include/asm/archrandom.h
index 3fe02da70004..fc1594a0710e 100644
--- a/arch/arm64/include/asm/archrandom.h
+++ b/arch/arm64/include/asm/archrandom.h
@@ -4,6 +4,8 @@
#ifdef CONFIG_ARCH_RANDOM
+#include <linux/bug.h>
+#include <linux/kernel.h>
#include <linux/random.h>
#include <asm/cpufeature.h>
@@ -66,6 +68,18 @@ static inline bool __init __early_cpu_has_rndr(void)
return (ftr >> ID_AA64ISAR0_RNDR_SHIFT) & 0xf;
}
+static inline bool __init __must_check
+arch_get_random_seed_long_early(unsigned long *v)
+{
+ WARN_ON(system_state != SYSTEM_BOOTING);
+
+ if (!__early_cpu_has_rndr())
+ return false;
+
+ return __arm64_rndr(v);
+}
+#define arch_get_random_seed_long_early arch_get_random_seed_long_early
+
#else
static inline bool __arm64_rndr(unsigned long *v) { return false; }