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authorEric Biggers <ebiggers@google.com>2019-03-12 22:12:47 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2019-03-22 20:57:27 +0800
commitb55e1a39543f5e9aadf1149f8ad4bcff5cace8a4 (patch)
tree9f50f2eee2a2e57fe689f899ff572f097feab054 /crypto
parent580e295178402d14bbf598a5702f8e01fc59dbaa (diff)
downloadlinux-b55e1a39543f5e9aadf1149f8ad4bcff5cace8a4.tar.bz2
crypto: simd,testmgr - introduce crypto_simd_usable()
So that the no-SIMD fallback code can be tested by the crypto self-tests, add a macro crypto_simd_usable() which wraps may_use_simd(), but also returns false if the crypto self-tests have set a per-CPU bool to disable SIMD in crypto code on the current CPU. Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/testmgr.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 5d56b2990762..52417dde811f 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -37,6 +37,7 @@
#include <crypto/akcipher.h>
#include <crypto/kpp.h>
#include <crypto/acompress.h>
+#include <crypto/internal/simd.h>
#include "internal.h"
@@ -52,6 +53,9 @@ MODULE_PARM_DESC(noextratests, "disable expensive crypto self-tests");
static unsigned int fuzz_iterations = 100;
module_param(fuzz_iterations, uint, 0644);
MODULE_PARM_DESC(fuzz_iterations, "number of fuzz test iterations");
+
+DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
+EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
#endif
#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
@@ -838,7 +842,27 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
WARN_ON_ONCE(!valid_testvec_config(cfg));
}
-#endif /* CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
+
+static void crypto_disable_simd_for_test(void)
+{
+ preempt_disable();
+ __this_cpu_write(crypto_simd_disabled_for_test, true);
+}
+
+static void crypto_reenable_simd_for_test(void)
+{
+ __this_cpu_write(crypto_simd_disabled_for_test, false);
+ preempt_enable();
+}
+#else /* !CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
+static void crypto_disable_simd_for_test(void)
+{
+}
+
+static void crypto_reenable_simd_for_test(void)
+{
+}
+#endif /* !CONFIG_CRYPTO_MANAGER_EXTRA_TESTS */
static int check_nonfinal_hash_op(const char *op, int err,
u8 *result, unsigned int digestsize,