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Subject[PATCH v2 1/3] crypto: Introduce notifier for new crypto algorithms
Date
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>
---
crypto/algapi.c | 2 ++
crypto/algboss.c | 2 ++
crypto/internal.h | 8 --------
include/crypto/algapi.h | 10 ++++++++++
4 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/crypto/algapi.c b/crypto/algapi.c
index c0755cf4f53f..33522a147412 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -367,6 +367,8 @@ 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);
diff --git a/crypto/algboss.c b/crypto/algboss.c
index 5e6df2a087fa..527b44d0af21 100644
--- a/crypto/algboss.c
+++ b/crypto/algboss.c
@@ -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;
diff --git a/crypto/internal.h b/crypto/internal.h
index 9a3f39939fba..ef769b5e8ad3 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -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);
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index bd5e8ccf1687..807501a4a754 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -425,4 +425,14 @@ 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 */
--
2.17.1
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