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s390/cpacf: Split and rework cpacf query functions

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commit 830999bd7e upstream.

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

Fixes: 1afd43e0fb ("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>
This commit is contained in:
Harald Freudenberger 2024-05-03 11:31:42 +02:00 committed by Greg Kroah-Hartman
parent 4c0bfb4e86
commit ab278ff72a
1 changed files with 81 additions and 20 deletions
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101
arch/s390/include/asm/cpacf.h
View file

@ -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(
" 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 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(
" 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_opcode(unsigned int opcode)
}
}
/**
* 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)) {