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crypto: api - Introduce notifier for new crypto algorithms 

Introduce a facility that can be used to receive a notification
callback when a new algorithm becomes available. This can be used by
existing crypto registrations to trigger a switch from a software-only
algorithm to a hardware-accelerated version.

A new CRYPTO_MSG_ALG_LOADED state is introduced to the existing crypto
notification chain, and the register/unregister functions are exported
so they can be called by subsystems outside of crypto.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Suggested-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Martin K. Petersen 2018-08-30 11:00:14 -04:00 committed by Herbert Xu
parent 2fffee536c
commit dd8b083f9a
4 changed files with 14 additions and 8 deletions
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2
crypto/algapi.c
View File

@ -372,6 +372,8 @@ static void crypto_wait_for_test(struct crypto_larval *larval)
err = wait_for_completion_killable(&larval->completion);
WARN_ON(err);
if (!err)
crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);
out:
crypto_larval_kill(&larval->alg);

2
crypto/algboss.c
View File

@ -274,6 +274,8 @@ static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
return cryptomgr_schedule_probe(data);
case CRYPTO_MSG_ALG_REGISTER:
return cryptomgr_schedule_test(data);
case CRYPTO_MSG_ALG_LOADED:
break;
}
return NOTIFY_DONE;

8
crypto/internal.h
View File

@ -26,12 +26,6 @@
#include <linux/rwsem.h>
#include <linux/slab.h>
/* Crypto notification events. */
enum {
CRYPTO_MSG_ALG_REQUEST,
CRYPTO_MSG_ALG_REGISTER,
};
struct crypto_instance;
struct crypto_template;
@ -90,8 +84,6 @@ struct crypto_alg *crypto_find_alg(const char *alg_name,
void *crypto_alloc_tfm(const char *alg_name,
const struct crypto_type *frontend, u32 type, u32 mask);
int crypto_register_notifier(struct notifier_block *nb);
int crypto_unregister_notifier(struct notifier_block *nb);
int crypto_probing_notify(unsigned long val, void *v);
unsigned int crypto_alg_extsize(struct crypto_alg *alg);

10
include/crypto/algapi.h
View File

@ -427,4 +427,14 @@ static inline void crypto_yield(u32 flags)
#endif
}
int crypto_register_notifier(struct notifier_block *nb);
int crypto_unregister_notifier(struct notifier_block *nb);
/* Crypto notification events. */
enum {
CRYPTO_MSG_ALG_REQUEST,
CRYPTO_MSG_ALG_REGISTER,
CRYPTO_MSG_ALG_LOADED,
};
#endif /* _CRYPTO_ALGAPI_H */