include/crypto/internal/simd.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Shared crypto simd helpers
   4  */
   5
   6 #ifndef _CRYPTO_INTERNAL_SIMD_H
   7 #define _CRYPTO_INTERNAL_SIMD_H
   8
   9 #include <linux/percpu.h>
  10 #include <linux/types.h>
  11
  12 /* skcipher support */
  13
  14 struct simd_skcipher_alg;
  15 struct skcipher_alg;
  16
  17 struct simd_skcipher_alg *simd_skcipher_create_compat(struct skcipher_alg *ialg,
  18                                                       const char *algname,
  19                                                       const char *drvname,
  20                                                       const char *basename);
  21 void simd_skcipher_free(struct simd_skcipher_alg *alg);
  22
  23 int simd_register_skciphers_compat(struct skcipher_alg *algs, int count,
  24                                    struct simd_skcipher_alg **simd_algs);
  25
  26 void simd_unregister_skciphers(struct skcipher_alg *algs, int count,
  27                                struct simd_skcipher_alg **simd_algs);
  28
  29 /* AEAD support */
  30
  31 struct simd_aead_alg;
  32 struct aead_alg;
  33
  34 int simd_register_aeads_compat(struct aead_alg *algs, int count,
  35                                struct simd_aead_alg **simd_algs);
  36
  37 void simd_unregister_aeads(struct aead_alg *algs, int count,
  38                            struct simd_aead_alg **simd_algs);
  39
  40 /*
  41  * crypto_simd_usable() - is it allowed at this time to use SIMD instructions or
  42  *                        access the SIMD register file?
  43  *
  44  * This delegates to may_use_simd(), except that this also returns false if SIMD
  45  * in crypto code has been temporarily disabled on this CPU by the crypto
  46  * self-tests, in order to test the no-SIMD fallback code.  This override is
  47  * currently limited to configurations where the extra self-tests are enabled,
  48  * because it might be a bit too invasive to be part of the regular self-tests.
  49  *
  50  * This is a macro so that <asm/simd.h>, which some architectures don't have,
  51  * doesn't have to be included directly here.
  52  */
  53 #ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
  54 DECLARE_PER_CPU(bool, crypto_simd_disabled_for_test);
  55 #define crypto_simd_usable() \
  56         (may_use_simd() && !this_cpu_read(crypto_simd_disabled_for_test))
  57 #else
  58 #define crypto_simd_usable() may_use_simd()
  59 #endif
  60
  61 #endif /* _CRYPTO_INTERNAL_SIMD_H */