+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-#include <linux/crc32.h>
-#include <crypto/internal/hash.h>
-#include <crypto/internal/simd.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <linux/cpufeature.h>
-#include <asm/simd.h>
-#include <asm/switch_to.h>
-
-#define CHKSUM_BLOCK_SIZE 1
-#define CHKSUM_DIGEST_SIZE 4
-
-#define VMX_ALIGN 16
-#define VMX_ALIGN_MASK (VMX_ALIGN-1)
-
-#define VECTOR_BREAKPOINT 512
-
-u32 __crc32c_vpmsum(u32 crc, unsigned char const *p, size_t len);
-
-static u32 crc32c_vpmsum(u32 crc, unsigned char const *p, size_t len)
-{
- unsigned int prealign;
- unsigned int tail;
-
- if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) || !crypto_simd_usable())
- return __crc32c_le(crc, p, len);
-
- if ((unsigned long)p & VMX_ALIGN_MASK) {
- prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK);
- crc = __crc32c_le(crc, p, prealign);
- len -= prealign;
- p += prealign;
- }
-
- if (len & ~VMX_ALIGN_MASK) {
- preempt_disable();
- pagefault_disable();
- enable_kernel_altivec();
- crc = __crc32c_vpmsum(crc, p, len & ~VMX_ALIGN_MASK);
- disable_kernel_altivec();
- pagefault_enable();
- preempt_enable();
- }
-
- tail = len & VMX_ALIGN_MASK;
- if (tail) {
- p += len & ~VMX_ALIGN_MASK;
- crc = __crc32c_le(crc, p, tail);
- }
-
- return crc;
-}
-
-static int crc32c_vpmsum_cra_init(struct crypto_tfm *tfm)
-{
- u32 *key = crypto_tfm_ctx(tfm);
-
- *key = ~0;
-
- return 0;
-}
-
-/*
- * Setting the seed allows arbitrary accumulators and flexible XOR policy
- * If your algorithm starts with ~0, then XOR with ~0 before you set
- * the seed.
- */
-static int crc32c_vpmsum_setkey(struct crypto_shash *hash, const u8 *key,
- unsigned int keylen)
-{
- u32 *mctx = crypto_shash_ctx(hash);
-
- if (keylen != sizeof(u32))
- return -EINVAL;
- *mctx = le32_to_cpup((__le32 *)key);
- return 0;
-}
-
-static int crc32c_vpmsum_init(struct shash_desc *desc)
-{
- u32 *mctx = crypto_shash_ctx(desc->tfm);
- u32 *crcp = shash_desc_ctx(desc);
-
- *crcp = *mctx;
-
- return 0;
-}
-
-static int crc32c_vpmsum_update(struct shash_desc *desc, const u8 *data,
- unsigned int len)
-{
- u32 *crcp = shash_desc_ctx(desc);
-
- *crcp = crc32c_vpmsum(*crcp, data, len);
-
- return 0;
-}
-
-static int __crc32c_vpmsum_finup(u32 *crcp, const u8 *data, unsigned int len,
- u8 *out)
-{
- *(__le32 *)out = ~cpu_to_le32(crc32c_vpmsum(*crcp, data, len));
-
- return 0;
-}
-
-static int crc32c_vpmsum_finup(struct shash_desc *desc, const u8 *data,
- unsigned int len, u8 *out)
-{
- return __crc32c_vpmsum_finup(shash_desc_ctx(desc), data, len, out);
-}
-
-static int crc32c_vpmsum_final(struct shash_desc *desc, u8 *out)
-{
- u32 *crcp = shash_desc_ctx(desc);
-
- *(__le32 *)out = ~cpu_to_le32p(crcp);
-
- return 0;
-}
-
-static int crc32c_vpmsum_digest(struct shash_desc *desc, const u8 *data,
- unsigned int len, u8 *out)
-{
- return __crc32c_vpmsum_finup(crypto_shash_ctx(desc->tfm), data, len,
- out);
-}
-
-static struct shash_alg alg = {
- .setkey = crc32c_vpmsum_setkey,
- .init = crc32c_vpmsum_init,
- .update = crc32c_vpmsum_update,
- .final = crc32c_vpmsum_final,
- .finup = crc32c_vpmsum_finup,
- .digest = crc32c_vpmsum_digest,
- .descsize = sizeof(u32),
- .digestsize = CHKSUM_DIGEST_SIZE,
- .base = {
- .cra_name = "crc32c",
- .cra_driver_name = "crc32c-vpmsum",
- .cra_priority = 200,
- .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
- .cra_blocksize = CHKSUM_BLOCK_SIZE,
- .cra_ctxsize = sizeof(u32),
- .cra_module = THIS_MODULE,
- .cra_init = crc32c_vpmsum_cra_init,
- }
-};
-
-static int __init crc32c_vpmsum_mod_init(void)
-{
- if (!cpu_has_feature(CPU_FTR_ARCH_207S))
- return -ENODEV;
-
- return crypto_register_shash(&alg);
-}
-
-static void __exit crc32c_vpmsum_mod_fini(void)
-{
- crypto_unregister_shash(&alg);
-}
-
-module_cpu_feature_match(PPC_MODULE_FEATURE_VEC_CRYPTO, crc32c_vpmsum_mod_init);
-module_exit(crc32c_vpmsum_mod_fini);
-
-MODULE_AUTHOR("Anton Blanchard <anton@samba.org>");
-MODULE_DESCRIPTION("CRC32C using vector polynomial multiply-sum instructions");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_CRYPTO("crc32c");
-MODULE_ALIAS_CRYPTO("crc32c-vpmsum");
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/crc32.h>
+#include <crypto/internal/simd.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/cpufeature.h>
+#include <asm/simd.h>
+#include <asm/switch_to.h>
+
+#define VMX_ALIGN 16
+#define VMX_ALIGN_MASK (VMX_ALIGN-1)
+
+#define VECTOR_BREAKPOINT 512
+
+static DEFINE_STATIC_KEY_FALSE(have_vec_crypto);
+
+u32 __crc32c_vpmsum(u32 crc, const u8 *p, size_t len);
+
+u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
+{
+ return crc32_le_base(crc, p, len);
+}
+EXPORT_SYMBOL(crc32_le_arch);
+
+u32 crc32c_le_arch(u32 crc, const u8 *p, size_t len)
+{
+ unsigned int prealign;
+ unsigned int tail;
+
+ if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) ||
+ !static_branch_likely(&have_vec_crypto) || !crypto_simd_usable())
+ return crc32c_le_base(crc, p, len);
+
+ if ((unsigned long)p & VMX_ALIGN_MASK) {
+ prealign = VMX_ALIGN - ((unsigned long)p & VMX_ALIGN_MASK);
+ crc = crc32c_le_base(crc, p, prealign);
+ len -= prealign;
+ p += prealign;
+ }
+
+ if (len & ~VMX_ALIGN_MASK) {
+ preempt_disable();
+ pagefault_disable();
+ enable_kernel_altivec();
+ crc = __crc32c_vpmsum(crc, p, len & ~VMX_ALIGN_MASK);
+ disable_kernel_altivec();
+ pagefault_enable();
+ preempt_enable();
+ }
+
+ tail = len & VMX_ALIGN_MASK;
+ if (tail) {
+ p += len & ~VMX_ALIGN_MASK;
+ crc = crc32c_le_base(crc, p, tail);
+ }
+
+ return crc;
+}
+EXPORT_SYMBOL(crc32c_le_arch);
+
+u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
+{
+ return crc32_be_base(crc, p, len);
+}
+EXPORT_SYMBOL(crc32_be_arch);
+
+static int __init crc32_powerpc_init(void)
+{
+ if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
+ (cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO))
+ static_branch_enable(&have_vec_crypto);
+ return 0;
+}
+arch_initcall(crc32_powerpc_init);
+
+static void __exit crc32_powerpc_exit(void)
+{
+}
+module_exit(crc32_powerpc_exit);
+
+u32 crc32_optimizations(void)
+{
+ if (static_key_enabled(&have_vec_crypto))
+ return CRC32C_OPTIMIZATION;
+ return 0;
+}
+EXPORT_SYMBOL(crc32_optimizations);
+
+MODULE_AUTHOR("Anton Blanchard <anton@samba.org>");
+MODULE_DESCRIPTION("CRC32C using vector polynomial multiply-sum instructions");
+MODULE_LICENSE("GPL");
projects / thirdparty / linux.git / commitdiff
