diff options
Diffstat (limited to 'arch/s390/include/asm/archrandom.h')
| -rw-r--r-- | arch/s390/include/asm/archrandom.h | 49 |
1 files changed, 12 insertions, 37 deletions
diff --git a/arch/s390/include/asm/archrandom.h b/arch/s390/include/asm/archrandom.h index c67b82dfa558..1594049893e0 100644 --- a/arch/s390/include/asm/archrandom.h +++ b/arch/s390/include/asm/archrandom.h @@ -2,7 +2,7 @@ /* * Kernel interface for the s390 arch_random_* functions * - * Copyright IBM Corp. 2017 + * Copyright IBM Corp. 2017, 2022 * * Author: Harald Freudenberger <freude@de.ibm.com> * @@ -11,53 +11,28 @@ #ifndef _ASM_S390_ARCHRANDOM_H #define _ASM_S390_ARCHRANDOM_H -#ifdef CONFIG_ARCH_RANDOM - #include <linux/static_key.h> +#include <linux/preempt.h> #include <linux/atomic.h> +#include <asm/cpacf.h> DECLARE_STATIC_KEY_FALSE(s390_arch_random_available); extern atomic64_t s390_arch_random_counter; -bool s390_arch_random_generate(u8 *buf, unsigned int nbytes); - -static inline bool arch_has_random(void) -{ - return false; -} - -static inline bool arch_has_random_seed(void) -{ - if (static_branch_likely(&s390_arch_random_available)) - return true; - return false; -} - -static inline bool arch_get_random_long(unsigned long *v) +static inline size_t __must_check arch_get_random_longs(unsigned long *v, size_t max_longs) { - return false; -} - -static inline bool arch_get_random_int(unsigned int *v) -{ - return false; -} - -static inline bool arch_get_random_seed_long(unsigned long *v) -{ - if (static_branch_likely(&s390_arch_random_available)) { - return s390_arch_random_generate((u8 *)v, sizeof(*v)); - } - return false; + return 0; } -static inline bool arch_get_random_seed_int(unsigned int *v) +static inline size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs) { - if (static_branch_likely(&s390_arch_random_available)) { - return s390_arch_random_generate((u8 *)v, sizeof(*v)); + if (static_branch_likely(&s390_arch_random_available) && + in_task()) { + cpacf_trng(NULL, 0, (u8 *)v, max_longs * sizeof(*v)); + atomic64_add(max_longs * sizeof(*v), &s390_arch_random_counter); + return max_longs; } - return false; + return 0; } -#endif /* CONFIG_ARCH_RANDOM */ #endif /* _ASM_S390_ARCHRANDOM_H */ |