[PATCH 6.6 117/137] s390/cpacf: Split and rework cpacf query functions

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Harald Freudenberger <freude@linux.ibm.com>

commit 830999bd7e72f4128b9dfa37090d9fa8120ce323 upstream.

Rework the cpacf query functions to use the correct RRE
or RRF instruction formats and set register fields within
instructions correctly.

Fixes: 1afd43e0fbba ("s390/crypto: allow to query all known cpacf functions")
Reported-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Suggested-by: Juergen Christ <jchrist@linux.ibm.com>
Suggested-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/s390/include/asm/cpacf.h |  101 +++++++++++++++++++++++++++++++++---------
 1 file changed, 81 insertions(+), 20 deletions(-)

--- a/arch/s390/include/asm/cpacf.h
+++ b/arch/s390/include/asm/cpacf.h
@@ -166,28 +166,79 @@
 
 typedef struct { unsigned char bytes[16]; } cpacf_mask_t;
 
-/**
- * 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 __always_inline void __cpacf_query(unsigned int opcode, cpacf_mask_t *mask)
+static __always_inline void __cpacf_query_rre(u32 opc, u8 r1, u8 r2,
+					      cpacf_mask_t *mask)
+{
+	asm volatile(
+		"	la	%%r1,%[mask]\n"
+		"	xgr	%%r0,%%r0\n"
+		"	.insn	rre,%[opc] << 16,%[r1],%[r2]\n"
+		: [mask] "=R" (*mask)
+		: [opc] "i" (opc),
+		  [r1] "i" (r1), [r2] "i" (r2)
+		: "cc", "r0", "r1");
+}
+
+static __always_inline void __cpacf_query_rrf(u32 opc,
+					      u8 r1, u8 r2, u8 r3, u8 m4,
+					      cpacf_mask_t *mask)
 {
 	asm volatile(
-		"	lghi	0,0\n" /* query function */
-		"	lgr	1,%[mask]\n"
-		"	spm	0\n" /* pckmo doesn't change the cc */
-		/* Parameter regs are ignored, but must be nonzero and unique */
-		"0:	.insn	rrf,%[opc] << 16,2,4,6,0\n"
-		"	brc	1,0b\n"	/* handle partial completion */
-		: "=m" (*mask)
-		: [mask] "d" ((unsigned long)mask), [opc] "i" (opcode)
-		: "cc", "0", "1");
+		"	la	%%r1,%[mask]\n"
+		"	xgr	%%r0,%%r0\n"
+		"	.insn	rrf,%[opc] << 16,%[r1],%[r2],%[r3],%[m4]\n"
+		: [mask] "=R" (*mask)
+		: [opc] "i" (opc), [r1] "i" (r1), [r2] "i" (r2),
+		  [r3] "i" (r3), [m4] "i" (m4)
+		: "cc", "r0", "r1");
+}
+
+static __always_inline void __cpacf_query(unsigned int opcode,
+					  cpacf_mask_t *mask)
+{
+	switch (opcode) {
+	case CPACF_KDSA:
+		__cpacf_query_rre(CPACF_KDSA, 0, 2, mask);
+		break;
+	case CPACF_KIMD:
+		__cpacf_query_rre(CPACF_KIMD, 0, 2, mask);
+		break;
+	case CPACF_KLMD:
+		__cpacf_query_rre(CPACF_KLMD, 0, 2, mask);
+		break;
+	case CPACF_KM:
+		__cpacf_query_rre(CPACF_KM, 2, 4, mask);
+		break;
+	case CPACF_KMA:
+		__cpacf_query_rrf(CPACF_KMA, 2, 4, 6, 0, mask);
+		break;
+	case CPACF_KMAC:
+		__cpacf_query_rre(CPACF_KMAC, 0, 2, mask);
+		break;
+	case CPACF_KMC:
+		__cpacf_query_rre(CPACF_KMC, 2, 4, mask);
+		break;
+	case CPACF_KMCTR:
+		__cpacf_query_rrf(CPACF_KMCTR, 2, 4, 6, 0, mask);
+		break;
+	case CPACF_KMF:
+		__cpacf_query_rre(CPACF_KMF, 2, 4, mask);
+		break;
+	case CPACF_KMO:
+		__cpacf_query_rre(CPACF_KMO, 2, 4, mask);
+		break;
+	case CPACF_PCC:
+		__cpacf_query_rre(CPACF_PCC, 0, 0, mask);
+		break;
+	case CPACF_PCKMO:
+		__cpacf_query_rre(CPACF_PCKMO, 0, 0, mask);
+		break;
+	case CPACF_PRNO:
+		__cpacf_query_rre(CPACF_PRNO, 2, 4, mask);
+		break;
+	default:
+		BUG();
+	}
 }
 
 static __always_inline int __cpacf_check_opcode(unsigned int opcode)
@@ -215,6 +266,16 @@ static __always_inline int __cpacf_check
 	}
 }
 
+/**
+ * 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 __always_inline int cpacf_query(unsigned int opcode, cpacf_mask_t *mask)
 {
 	if (__cpacf_check_opcode(opcode)) {