^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Calculate a CRC T10-DIF with vpmsum acceleration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2017, Daniel Axtens, IBM Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * [based on crc32c-vpmsum_glue.c]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/crc-t10dif.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <crypto/internal/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <crypto/internal/simd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/cpufeature.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <asm/simd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define VMX_ALIGN 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define VMX_ALIGN_MASK (VMX_ALIGN-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define VECTOR_BREAKPOINT 64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) u32 __crct10dif_vpmsum(u32 crc, unsigned char const *p, size_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static u16 crct10dif_vpmsum(u16 crci, unsigned char const *p, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) unsigned int prealign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) unsigned int tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) u32 crc = crci;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) || !crypto_simd_usable())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return crc_t10dif_generic(crc, p, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if ((unsigned long)p & VMX_ALIGN_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) crc = crc_t10dif_generic(crc, p, prealign);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) len -= prealign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) p += prealign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (len & ~VMX_ALIGN_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) crc <<= 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) pagefault_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) enable_kernel_altivec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) crc = __crct10dif_vpmsum(crc, p, len & ~VMX_ALIGN_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) disable_kernel_altivec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) pagefault_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) crc >>= 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) tail = len & VMX_ALIGN_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (tail) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) p += len & ~VMX_ALIGN_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) crc = crc_t10dif_generic(crc, p, tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return crc & 0xffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int crct10dif_vpmsum_init(struct shash_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) u16 *crc = shash_desc_ctx(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) *crc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int crct10dif_vpmsum_update(struct shash_desc *desc, const u8 *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned int length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) u16 *crc = shash_desc_ctx(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *crc = crct10dif_vpmsum(*crc, data, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int crct10dif_vpmsum_final(struct shash_desc *desc, u8 *out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) u16 *crcp = shash_desc_ctx(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) *(u16 *)out = *crcp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static struct shash_alg alg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .init = crct10dif_vpmsum_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .update = crct10dif_vpmsum_update,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) .final = crct10dif_vpmsum_final,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .descsize = CRC_T10DIF_DIGEST_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .digestsize = CRC_T10DIF_DIGEST_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .base = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .cra_name = "crct10dif",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) .cra_driver_name = "crct10dif-vpmsum",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) .cra_priority = 200,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) .cra_blocksize = CRC_T10DIF_BLOCK_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) .cra_module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static int __init crct10dif_vpmsum_mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (!cpu_has_feature(CPU_FTR_ARCH_207S))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return crypto_register_shash(&alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static void __exit crct10dif_vpmsum_mod_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) crypto_unregister_shash(&alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) module_cpu_feature_match(PPC_MODULE_FEATURE_VEC_CRYPTO, crct10dif_vpmsum_mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) module_exit(crct10dif_vpmsum_mod_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) MODULE_DESCRIPTION("CRCT10DIF using vector polynomial multiply-sum instructions");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) MODULE_ALIAS_CRYPTO("crct10dif");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) MODULE_ALIAS_CRYPTO("crct10dif-vpmsum");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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