^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/crc32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <crypto/internal/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <crypto/internal/simd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/cpufeature.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/simd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define CHKSUM_BLOCK_SIZE 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define CHKSUM_DIGEST_SIZE 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define VMX_ALIGN 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define VMX_ALIGN_MASK (VMX_ALIGN-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define VECTOR_BREAKPOINT 512
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) u32 __crc32c_vpmsum(u32 crc, unsigned char const *p, size_t len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static u32 crc32c_vpmsum(u32 crc, unsigned char const *p, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) unsigned int prealign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) || !crypto_simd_usable())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) return __crc32c_le(crc, p, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if ((unsigned long)p & VMX_ALIGN_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) crc = __crc32c_le(crc, p, prealign);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) len -= prealign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) p += prealign;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (len & ~VMX_ALIGN_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) pagefault_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) enable_kernel_altivec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) crc = __crc32c_vpmsum(crc, p, len & ~VMX_ALIGN_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) disable_kernel_altivec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) pagefault_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) tail = len & VMX_ALIGN_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (tail) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) p += len & ~VMX_ALIGN_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) crc = __crc32c_le(crc, p, tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static int crc32c_vpmsum_cra_init(struct crypto_tfm *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) u32 *key = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) *key = ~0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * Setting the seed allows arbitrary accumulators and flexible XOR policy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * If your algorithm starts with ~0, then XOR with ~0 before you set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * the seed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int crc32c_vpmsum_setkey(struct crypto_shash *hash, const u8 *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned int keylen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) u32 *mctx = crypto_shash_ctx(hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (keylen != sizeof(u32))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) *mctx = le32_to_cpup((__le32 *)key);
^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) static int crc32c_vpmsum_init(struct shash_desc *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) u32 *mctx = crypto_shash_ctx(desc->tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) u32 *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) *crcp = *mctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static int crc32c_vpmsum_update(struct shash_desc *desc, const u8 *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) u32 *crcp = shash_desc_ctx(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) *crcp = crc32c_vpmsum(*crcp, data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int __crc32c_vpmsum_finup(u32 *crcp, const u8 *data, unsigned int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) u8 *out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) *(__le32 *)out = ~cpu_to_le32(crc32c_vpmsum(*crcp, data, len));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int crc32c_vpmsum_finup(struct shash_desc *desc, const u8 *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unsigned int len, u8 *out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return __crc32c_vpmsum_finup(shash_desc_ctx(desc), data, len, out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static int crc32c_vpmsum_final(struct shash_desc *desc, u8 *out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) u32 *crcp = shash_desc_ctx(desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) *(__le32 *)out = ~cpu_to_le32p(crcp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static int crc32c_vpmsum_digest(struct shash_desc *desc, const u8 *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) unsigned int len, u8 *out)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return __crc32c_vpmsum_finup(crypto_shash_ctx(desc->tfm), data, len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) out);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static struct shash_alg alg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) .setkey = crc32c_vpmsum_setkey,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) .init = crc32c_vpmsum_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) .update = crc32c_vpmsum_update,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .final = crc32c_vpmsum_final,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) .finup = crc32c_vpmsum_finup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .digest = crc32c_vpmsum_digest,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .descsize = sizeof(u32),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .digestsize = CHKSUM_DIGEST_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) .base = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .cra_name = "crc32c",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) .cra_driver_name = "crc32c-vpmsum",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) .cra_priority = 200,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) .cra_blocksize = CHKSUM_BLOCK_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .cra_ctxsize = sizeof(u32),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) .cra_module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) .cra_init = crc32c_vpmsum_cra_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static int __init crc32c_vpmsum_mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (!cpu_has_feature(CPU_FTR_ARCH_207S))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return crypto_register_shash(&alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static void __exit crc32c_vpmsum_mod_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) crypto_unregister_shash(&alg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) module_cpu_feature_match(PPC_MODULE_FEATURE_VEC_CRYPTO, crc32c_vpmsum_mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) module_exit(crc32c_vpmsum_mod_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) MODULE_AUTHOR("Anton Blanchard <anton@samba.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_DESCRIPTION("CRC32C using vector polynomial multiply-sum instructions");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) MODULE_ALIAS_CRYPTO("crc32c");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) MODULE_ALIAS_CRYPTO("crc32c-vpmsum");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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