s390/crypto: cleanup and move the header with the cpacf definitions

The CPACF instructions are going be used in KVM as well, move the
defines and the inline functions from arch/s390/crypt/crypt_s390.h
to arch/s390/include/asm. Rename the header to cpacf.h and replace
the crypt_s390_xxx names with cpacf_xxx.

While we are at it, cleanup the header as well. The encoding for
the CPACF operations is odd, there is an enum for each of the CPACF
instructions with the hardware function code in the lower 8 bits of
each entry and a software defined number for the CPACF instruction
in the upper 8 bits. Remove the superfluous software number and
replace the enums with simple defines.

The crypt_s390_func_available() function tests for the presence
of a specific CPACF operations. The new name of the function is
cpacf_query and it works slightly different than before. It gets
passed an opcode of an CPACF instruction and a function code for
this instruction. The facility_mask parameter is gone, the opcode
is used to find the correct MSA facility bit to check if the CPACF
instruction itself is available. If it is the query function of the
given instruction is used to test if the requested CPACF operation
is present.

Acked-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 410 insertions, 0 deletions

diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h
new file mode 100644
index 000000000000..1a82cf26ee11
--- /dev/null
+++ b/arch/s390/include/asm/cpacf.h
@@ -0,0 +1,410 @@
+/*
+ * CP Assist for Cryptographic Functions (CPACF)
+ *
+ * Copyright IBM Corp. 2003, 2016
+ * Author(s): Thomas Spatzier
+ *	      Jan Glauber
+ *	      Harald Freudenberger (freude@de.ibm.com)
+ *	      Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+#ifndef _ASM_S390_CPACF_H
+#define _ASM_S390_CPACF_H
+
+#include <asm/facility.h>
+
+/*
+ * Instruction opcodes for the CPACF instructions
+ */
+#define CPACF_KMAC		0xb91e		/* MSA	*/
+#define CPACF_KM		0xb92e		/* MSA	*/
+#define CPACF_KMC		0xb92f		/* MSA	*/
+#define CPACF_KIMD		0xb93e		/* MSA	*/
+#define CPACF_KLMD		0xb93f		/* MSA	*/
+#define CPACF_PCC		0xb92c		/* MSA4 */
+#define CPACF_KMCTR		0xb92d		/* MSA4 */
+#define CPACF_PPNO		0xb93c		/* MSA5 */
+
+/*
+ * Function codes for the KM (CIPHER MESSAGE)
+ * instruction (0x80 is the decipher modifier bit)
+ */
+#define CPACF_KM_QUERY		0x00
+#define CPACF_KM_DEA_ENC	0x01
+#define CPACF_KM_DEA_DEC	0x81
+#define CPACF_KM_TDEA_128_ENC	0x02
+#define CPACF_KM_TDEA_128_DEC	0x82
+#define CPACF_KM_TDEA_192_ENC	0x03
+#define CPACF_KM_TDEA_192_DEC	0x83
+#define CPACF_KM_AES_128_ENC	0x12
+#define CPACF_KM_AES_128_DEC	0x92
+#define CPACF_KM_AES_192_ENC	0x13
+#define CPACF_KM_AES_192_DEC	0x93
+#define CPACF_KM_AES_256_ENC	0x14
+#define CPACF_KM_AES_256_DEC	0x94
+#define CPACF_KM_XTS_128_ENC	0x32
+#define CPACF_KM_XTS_128_DEC	0xb2
+#define CPACF_KM_XTS_256_ENC	0x34
+#define CPACF_KM_XTS_256_DEC	0xb4
+
+/*
+ * Function codes for the KMC (CIPHER MESSAGE WITH CHAINING)
+ * instruction (0x80 is the decipher modifier bit)
+ */
+#define CPACF_KMC_QUERY		0x00
+#define CPACF_KMC_DEA_ENC	0x01
+#define CPACF_KMC_DEA_DEC	0x81
+#define CPACF_KMC_TDEA_128_ENC	0x02
+#define CPACF_KMC_TDEA_128_DEC	0x82
+#define CPACF_KMC_TDEA_192_ENC	0x03
+#define CPACF_KMC_TDEA_192_DEC	0x83
+#define CPACF_KMC_AES_128_ENC	0x12
+#define CPACF_KMC_AES_128_DEC	0x92
+#define CPACF_KMC_AES_192_ENC	0x13
+#define CPACF_KMC_AES_192_DEC	0x93
+#define CPACF_KMC_AES_256_ENC	0x14
+#define CPACF_KMC_AES_256_DEC	0x94
+#define CPACF_KMC_PRNG		0x43
+
+/*
+ * Function codes for the KMCTR (CIPHER MESSAGE WITH COUNTER)
+ * instruction (0x80 is the decipher modifier bit)
+ */
+#define CPACF_KMCTR_QUERY	 0x00
+#define CPACF_KMCTR_DEA_ENC	 0x01
+#define CPACF_KMCTR_DEA_DEC	 0x81
+#define CPACF_KMCTR_TDEA_128_ENC 0x02
+#define CPACF_KMCTR_TDEA_128_DEC 0x82
+#define CPACF_KMCTR_TDEA_192_ENC 0x03
+#define CPACF_KMCTR_TDEA_192_DEC 0x83
+#define CPACF_KMCTR_AES_128_ENC	 0x12
+#define CPACF_KMCTR_AES_128_DEC	 0x92
+#define CPACF_KMCTR_AES_192_ENC	 0x13
+#define CPACF_KMCTR_AES_192_DEC	 0x93
+#define CPACF_KMCTR_AES_256_ENC	 0x14
+#define CPACF_KMCTR_AES_256_DEC	 0x94
+
+/*
+ * Function codes for the KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST)
+ * instruction (0x80 is the decipher modifier bit)
+ */
+#define CPACF_KIMD_QUERY	0x00
+#define CPACF_KIMD_SHA_1	0x01
+#define CPACF_KIMD_SHA_256	0x02
+#define CPACF_KIMD_SHA_512	0x03
+#define CPACF_KIMD_GHASH	0x41
+
+/*
+ * Function codes for the KLMD (COMPUTE LAST MESSAGE DIGEST)
+ * instruction (0x80 is the decipher modifier bit)
+ */
+#define CPACF_KLMD_QUERY	0x00
+#define CPACF_KLMD_SHA_1	0x01
+#define CPACF_KLMD_SHA_256	0x02
+#define CPACF_KLMD_SHA_512	0x03
+
+/*
+ * function codes for the KMAC (COMPUTE MESSAGE AUTHENTICATION CODE)
+ * instruction (0x80 is the decipher modifier bit)
+ */
+#define CPACF_KMAC_QUERY	0x00
+#define CPACF_KMAC_DEA		0x01
+#define CPACF_KMAC_TDEA_128	0x02
+#define CPACF_KMAC_TDEA_192	0x03
+
+/*
+ * Function codes for the PPNO (PERFORM PSEUDORANDOM NUMBER OPERATION)
+ * instruction (0x80 is the decipher modifier bit)
+ */
+#define CPACF_PPNO_QUERY		0x00
+#define CPACF_PPNO_SHA512_DRNG_GEN	0x03
+#define CPACF_PPNO_SHA512_DRNG_SEED	0x83
+
+/**
+ * cpacf_query() - check if a specific CPACF function is available
+ * @opcode: the opcode of the crypto instruction
+ * @func: the function code to test for
+ *
+ * Executes the query function for the given crypto instruction @opcode
+ * and checks if @func is available
+ *
+ * Returns 1 if @func is available for @opcode, 0 otherwise
+ */
+static inline void __cpacf_query(unsigned int opcode, unsigned char *status)
+{
+	typedef struct { unsigned char _[16]; } status_type;
+	register unsigned long r0 asm("0") = 0;	/* query function */
+	register unsigned long r1 asm("1") = (unsigned long) status;
+
+	asm volatile(
+		/* Parameter registers are ignored, but may not be 0 */
+		"0:	.insn	rrf,%[opc] << 16,2,2,2,0\n"
+		"	brc	1,0b\n"	/* handle partial completion */
+		: "=m" (*(status_type *) status)
+		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (opcode)
+		: "cc");
+}
+
+static inline int cpacf_query(unsigned int opcode, unsigned int func)
+{
+	unsigned char status[16];
+
+	switch (opcode) {
+	case CPACF_KMAC:
+	case CPACF_KM:
+	case CPACF_KMC:
+	case CPACF_KIMD:
+	case CPACF_KLMD:
+		if (!test_facility(17))	/* check for MSA */
+			return 0;
+		break;
+	case CPACF_PCC:
+	case CPACF_KMCTR:
+		if (!test_facility(77))	/* check for MSA4 */
+			return 0;
+		break;
+	case CPACF_PPNO:
+		if (!test_facility(57))	/* check for MSA5 */
+			return 0;
+		break;
+	default:
+		BUG();
+	}
+	__cpacf_query(opcode, status);
+	return (status[func >> 3] & (0x80 >> (func & 7))) != 0;
+}
+
+/**
+ * cpacf_km() - executes the KM (CIPHER MESSAGE) instruction
+ * @func: the function code passed to KM; see CPACF_KM_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ * @dest: address of destination memory area
+ * @src: address of source memory area
+ * @src_len: length of src operand in bytes
+ *
+ * Returns 0 for the query func, number of processed bytes for
+ * encryption/decryption funcs
+ */
+static inline int cpacf_km(long func, void *param,
+			   u8 *dest, const u8 *src, long src_len)
+{
+	register unsigned long r0 asm("0") = (unsigned long) func;
+	register unsigned long r1 asm("1") = (unsigned long) param;
+	register unsigned long r2 asm("2") = (unsigned long) src;
+	register unsigned long r3 asm("3") = (unsigned long) src_len;
+	register unsigned long r4 asm("4") = (unsigned long) dest;
+
+	asm volatile(
+		"0:	.insn	rre,%[opc] << 16,%[dst],%[src]\n"
+		"	brc	1,0b\n" /* handle partial completion */
+		: [src] "+a" (r2), [len] "+d" (r3), [dst] "+a" (r4)
+		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (CPACF_KM)
+		: "cc", "memory");
+
+	return src_len - r3;
+}
+
+/**
+ * cpacf_kmc() - executes the KMC (CIPHER MESSAGE WITH CHAINING) instruction
+ * @func: the function code passed to KM; see CPACF_KMC_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ * @dest: address of destination memory area
+ * @src: address of source memory area
+ * @src_len: length of src operand in bytes
+ *
+ * Returns 0 for the query func, number of processed bytes for
+ * encryption/decryption funcs
+ */
+static inline int cpacf_kmc(long func, void *param,
+			    u8 *dest, const u8 *src, long src_len)
+{
+	register unsigned long r0 asm("0") = (unsigned long) func;
+	register unsigned long r1 asm("1") = (unsigned long) param;
+	register unsigned long r2 asm("2") = (unsigned long) src;
+	register unsigned long r3 asm("3") = (unsigned long) src_len;
+	register unsigned long r4 asm("4") = (unsigned long) dest;
+
+	asm volatile(
+		"0:	.insn	rre,%[opc] << 16,%[dst],%[src]\n"
+		"	brc	1,0b\n" /* handle partial completion */
+		: [src] "+a" (r2), [len] "+d" (r3), [dst] "+a" (r4)
+		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (CPACF_KMC)
+		: "cc", "memory");
+
+	return src_len - r3;
+}
+
+/**
+ * cpacf_kimd() - executes the KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST)
+ *		  instruction
+ * @func: the function code passed to KM; see CPACF_KIMD_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ * @src: address of source memory area
+ * @src_len: length of src operand in bytes
+ *
+ * Returns 0 for the query func, number of processed bytes for digest funcs
+ */
+static inline int cpacf_kimd(long func, void *param,
+			     const u8 *src, long src_len)
+{
+	register unsigned long r0 asm("0") = (unsigned long) func;
+	register unsigned long r1 asm("1") = (unsigned long) param;
+	register unsigned long r2 asm("2") = (unsigned long) src;
+	register unsigned long r3 asm("3") = (unsigned long) src_len;
+
+	asm volatile(
+		"0:	.insn	rre,%[opc] << 16,0,%[src]\n"
+		"	brc	1,0b\n" /* handle partial completion */
+		: [src] "+a" (r2), [len] "+d" (r3)
+		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (CPACF_KIMD)
+		: "cc", "memory");
+
+	return src_len - r3;
+}
+
+/**
+ * cpacf_klmd() - executes the KLMD (COMPUTE LAST MESSAGE DIGEST) instruction
+ * @func: the function code passed to KM; see CPACF_KLMD_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ * @src: address of source memory area
+ * @src_len: length of src operand in bytes
+ *
+ * Returns 0 for the query func, number of processed bytes for digest funcs
+ */
+static inline int cpacf_klmd(long func, void *param,
+			     const u8 *src, long src_len)
+{
+	register unsigned long r0 asm("0") = (unsigned long) func;
+	register unsigned long r1 asm("1") = (unsigned long) param;
+	register unsigned long r2 asm("2") = (unsigned long) src;
+	register unsigned long r3 asm("3") = (unsigned long) src_len;
+
+	asm volatile(
+		"0:	.insn	rre,%[opc] << 16,0,%[src]\n"
+		"	brc	1,0b\n" /* handle partial completion */
+		: [src] "+a" (r2), [len] "+d" (r3)
+		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (CPACF_KLMD)
+		: "cc", "memory");
+
+	return src_len - r3;
+}
+
+/**
+ * cpacf_kmac() - executes the KMAC (COMPUTE MESSAGE AUTHENTICATION CODE)
+ *		  instruction
+ * @func: the function code passed to KM; see CPACF_KMAC_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ * @src: address of source memory area
+ * @src_len: length of src operand in bytes
+ *
+ * Returns 0 for the query func, number of processed bytes for digest funcs
+ */
+static inline int cpacf_kmac(long func, void *param,
+			     const u8 *src, long src_len)
+{
+	register unsigned long r0 asm("0") = (unsigned long) func;
+	register unsigned long r1 asm("1") = (unsigned long) param;
+	register unsigned long r2 asm("2") = (unsigned long) src;
+	register unsigned long r3 asm("3") = (unsigned long) src_len;
+
+	asm volatile(
+		"0:	.insn	rre,%[opc] << 16,0,%[src]\n"
+		"	brc	1,0b\n" /* handle partial completion */
+		: [src] "+a" (r2), [len] "+d" (r3)
+		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (CPACF_KMAC)
+		: "cc", "memory");
+
+	return src_len - r3;
+}
+
+/**
+ * cpacf_kmctr() - executes the KMCTR (CIPHER MESSAGE WITH COUNTER) instruction
+ * @func: the function code passed to KMCTR; see CPACF_KMCTR_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ * @dest: address of destination memory area
+ * @src: address of source memory area
+ * @src_len: length of src operand in bytes
+ * @counter: address of counter value
+ *
+ * Returns 0 for the query func, number of processed bytes for
+ * encryption/decryption funcs
+ */
+static inline int cpacf_kmctr(long func, void *param, u8 *dest,
+			      const u8 *src, long src_len, u8 *counter)
+{
+	register unsigned long r0 asm("0") = (unsigned long) func;
+	register unsigned long r1 asm("1") = (unsigned long) param;
+	register unsigned long r2 asm("2") = (unsigned long) src;
+	register unsigned long r3 asm("3") = (unsigned long) src_len;
+	register unsigned long r4 asm("4") = (unsigned long) dest;
+	register unsigned long r6 asm("6") = (unsigned long) counter;
+
+	asm volatile(
+		"0:	.insn	rrf,%[opc] << 16,%[dst],%[src],%[ctr],0\n"
+		"	brc	1,0b\n" /* handle partial completion */
+		: [src] "+a" (r2), [len] "+d" (r3),
+		  [dst] "+a" (r4), [ctr] "+a" (r6)
+		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (CPACF_KMCTR)
+		: "cc", "memory");
+
+	return src_len - r3;
+}
+
+/**
+ * cpacf_ppno() - executes the PPNO (PERFORM PSEUDORANDOM NUMBER OPERATION)
+ *		  instruction
+ * @func: the function code passed to PPNO; see CPACF_PPNO_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ * @dest: address of destination memory area
+ * @dest_len: size of destination memory area in bytes
+ * @seed: address of seed data
+ * @seed_len: size of seed data in bytes
+ *
+ * Returns 0 for the query func, number of random bytes stored in
+ * dest buffer for generate function
+ */
+static inline int cpacf_ppno(long func, void *param,
+			     u8 *dest, long dest_len,
+			     const u8 *seed, long seed_len)
+{
+	register unsigned long r0 asm("0") = (unsigned long) func;
+	register unsigned long r1 asm("1") = (unsigned long) param;
+	register unsigned long r2 asm("2") = (unsigned long) dest;
+	register unsigned long r3 asm("3") = (unsigned long) dest_len;
+	register unsigned long r4 asm("4") = (unsigned long) seed;
+	register unsigned long r5 asm("5") = (unsigned long) seed_len;
+
+	asm volatile (
+		"0:	.insn	rre,%[opc] << 16,%[dst],%[seed]\n"
+		"	brc	1,0b\n"	  /* handle partial completion */
+		: [dst] "+a" (r2), [dlen] "+d" (r3)
+		: [fc] "d" (r0), [pba] "a" (r1),
+		  [seed] "a" (r4), [slen] "d" (r5), [opc] "i" (CPACF_PPNO)
+		: "cc", "memory");
+
+	return dest_len - r3;
+}
+
+/**
+ * cpacf_pcc() - executes the PCC (PERFORM CRYPTOGRAPHIC COMPUTATION)
+ *		 instruction
+ * @func: the function code passed to PCC; see CPACF_KM_xxx defines
+ * @param: address of parameter block; see POP for details on each func
+ *
+ * Returns 0.
+ */
+static inline int cpacf_pcc(long func, void *param)
+{
+	register unsigned long r0 asm("0") = (unsigned long) func;
+	register unsigned long r1 asm("1") = (unsigned long) param;
+
+	asm volatile(
+		"0:	.insn	rre,%[opc] << 16,0,0\n" /* PCC opcode */
+		"	brc	1,0b\n" /* handle partial completion */
+		:
+		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (CPACF_PCC)
+		: "cc", "memory");
+
+	return 0;
+}
+
+#endif	/* _ASM_S390_CPACF_H */