sparc64: Add CRC32C driver making use of the new crc32c opcode.

Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 219 insertions, 0 deletions

diff --git a/arch/sparc/crypto/Makefile b/arch/sparc/crypto/Makefile
index 5034324fdd46..c6ca94181f45 100644
--- a/arch/sparc/crypto/Makefile
+++ b/arch/sparc/crypto/Makefile
@@ -9,9 +9,13 @@ obj-$(CONFIG_CRYPTO_MD5_SPARC64) += md5-sparc64.o
 
 obj-$(CONFIG_CRYPTO_AES_SPARC64) += aes-sparc64.o
 
+obj-$(CONFIG_CRYPTO_CRC32C_SPARC64) += crc32c-sparc64.o
+
 sha1-sparc64-y := sha1_asm.o sha1_glue.o
 sha256-sparc64-y := sha256_asm.o sha256_glue.o
 sha512-sparc64-y := sha512_asm.o sha512_glue.o
 md5-sparc64-y := md5_asm.o md5_glue.o
 
 aes-sparc64-y := aes_asm.o aes_glue.o
+
+crc32c-sparc64-y := crc32c_asm.o crc32c_glue.o
diff --git a/arch/sparc/crypto/crc32c_asm.S b/arch/sparc/crypto/crc32c_asm.S
new file mode 100644
index 000000000000..cb479ec72433
--- /dev/null
+++ b/arch/sparc/crypto/crc32c_asm.S
@@ -0,0 +1,29 @@
+#include <linux/linkage.h>
+#include <asm/visasm.h>
+#include <asm/asi.h>
+
+#define F3F(x,y,z)      (((x)<<30)|((y)<<19)|((z)<<5))
+
+#define FPD_ENCODE(x)   (((x) >> 5) | ((x) & ~(0x20)))
+
+#define RS1(x)          (FPD_ENCODE(x) << 14)
+#define RS2(x)          (FPD_ENCODE(x) <<  0)
+#define RD(x)           (FPD_ENCODE(x) << 25)
+
+#define CRC32C(a,b,c)   \
+        .word           (F3F(2,0x36,0x147)|RS1(a)|RS2(b)|RD(c));
+
+ENTRY(crc32c_sparc64)
+        /* %o0=crc32p, %o1=data_ptr, %o2=len */
+        VISEntryHalf
+        lda     [%o0] ASI_PL, %f1
+1:      ldd     [%o1], %f2
+        CRC32C(0,2,0)
+        subcc   %o2, 8, %o2
+        bne,pt  %icc, 1b
+         add    %o1, 0x8, %o1
+        sta     %f1, [%o0] ASI_PL
+        VISExitHalf
+2:      retl
+         nop
+ENDPROC(crc32c_sparc64)
diff --git a/arch/sparc/crypto/crc32c_glue.c b/arch/sparc/crypto/crc32c_glue.c
new file mode 100644
index 000000000000..ec31cdb20a14
--- /dev/null
+++ b/arch/sparc/crypto/crc32c_glue.c
@@ -0,0 +1,177 @@
+/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
+ *
+ * This is based largely upon arch/x86/crypto/crc32c-intel.c
+ *
+ * Copyright (C) 2008 Intel Corporation
+ * Authors: Austin Zhang <austin_zhang@linux.intel.com>
+ *          Kent Liu <kent.liu@intel.com>
+ */
+
+#define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/crc32.h>
+
+#include <crypto/internal/hash.h>
+
+#include <asm/pstate.h>
+#include <asm/elf.h>
+
+/*
+ * 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_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
+                                 unsigned int keylen)
+{
+        u32 *mctx = crypto_shash_ctx(hash);
+
+        if (keylen != sizeof(u32)) {
+                crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
+                return -EINVAL;
+        }
+        *(__le32 *)mctx = le32_to_cpup((__le32 *)key);
+        return 0;
+}
+
+static int crc32c_sparc64_init(struct shash_desc *desc)
+{
+        u32 *mctx = crypto_shash_ctx(desc->tfm);
+        u32 *crcp = shash_desc_ctx(desc);
+
+        *crcp = *mctx;
+
+        return 0;
+}
+
+extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
+
+static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
+{
+        unsigned int asm_len;
+
+        asm_len = len & ~7U;
+        if (asm_len) {
+                crc32c_sparc64(crcp, data, asm_len);
+                data += asm_len / 8;
+                len -= asm_len;
+        }
+        if (len)
+                *crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
+}
+
+static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
+                                 unsigned int len)
+{
+        u32 *crcp = shash_desc_ctx(desc);
+
+        crc32c_compute(crcp, (const u64 *) data, len);
+
+        return 0;
+}
+
+static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
+                                  u8 *out)
+{
+        u32 tmp = *crcp;
+
+        crc32c_compute(&tmp, (const u64 *) data, len);
+
+        *(__le32 *) out = ~cpu_to_le32(tmp);
+        return 0;
+}
+
+static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
+                                unsigned int len, u8 *out)
+{
+        return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
+}
+
+static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
+{
+        u32 *crcp = shash_desc_ctx(desc);
+
+        *(__le32 *) out = ~cpu_to_le32p(crcp);
+        return 0;
+}
+
+static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
+                                 unsigned int len, u8 *out)
+{
+        return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
+                                      out);
+}
+
+static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
+{
+        u32 *key = crypto_tfm_ctx(tfm);
+
+        *key = ~0;
+
+        return 0;
+}
+
+#define CHKSUM_BLOCK_SIZE       1
+#define CHKSUM_DIGEST_SIZE      4
+
+static struct shash_alg alg = {
+        .setkey                 =       crc32c_sparc64_setkey,
+        .init                   =       crc32c_sparc64_init,
+        .update                 =       crc32c_sparc64_update,
+        .final                  =       crc32c_sparc64_final,
+        .finup                  =       crc32c_sparc64_finup,
+        .digest                 =       crc32c_sparc64_digest,
+        .descsize               =       sizeof(u32),
+        .digestsize             =       CHKSUM_DIGEST_SIZE,
+        .base                   =       {
+                .cra_name               =       "crc32c",
+                .cra_driver_name        =       "crc32c-sparc64",
+                .cra_priority           =       150,
+                .cra_blocksize          =       CHKSUM_BLOCK_SIZE,
+                .cra_ctxsize            =       sizeof(u32),
+                .cra_alignmask          =       7,
+                .cra_module             =       THIS_MODULE,
+                .cra_init               =       crc32c_sparc64_cra_init,
+        }
+};
+
+static bool __init sparc64_has_crc32c_opcode(void)
+{
+        unsigned long cfr;
+
+        if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
+                return false;
+
+        __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+        if (!(cfr & CFR_CRC32C))
+                return false;
+
+        return true;
+}
+
+static int __init crc32c_sparc64_mod_init(void)
+{
+        if (sparc64_has_crc32c_opcode()) {
+                pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
+                return crypto_register_shash(&alg);
+        }
+        pr_info("sparc64 crc32c opcode not available.\n");
+        return -ENODEV;
+}
+
+static void __exit crc32c_sparc64_mod_fini(void)
+{
+        crypto_unregister_shash(&alg);
+}
+
+module_init(crc32c_sparc64_mod_init);
+module_exit(crc32c_sparc64_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
+
+MODULE_ALIAS("crc32c");
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 49f867b2025d..83993ea84cce 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -336,6 +336,15 @@ config CRYPTO_CRC32C_INTEL
           gain performance compared with software implementation.
           Module will be crc32c-intel.
 
+config CRYPTO_CRC32C_SPARC64
+        tristate "CRC32c CRC algorithm (SPARC64)"
+        depends on SPARC64
+        select CRYPTO_HASH
+        select CRC32
+        help
+          CRC32c CRC algorithm implemented using sparc64 crypto instructions,
+          when available.
+
 config CRYPTO_GHASH
         tristate "GHASH digest algorithm"
         select CRYPTO_GF128MUL