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| author | Joerg Schmidbauer <jschmidb@de.ibm.com> | 2024-08-28 13:52:30 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2024-08-29 22:56:34 +0200 |
| commit | 88c02b3f79a61e659749773865998e0c33247e86 (patch) | |
| tree | c9a32b4f7daef390c23370509babb9eab2afd36f /arch/s390/include | |
| parent | 177b621bf0685e8733fa6a7c796865f4200a6e2f (diff) | |
| download | linux-stable-88c02b3f79a61e659749773865998e0c33247e86.tar.gz linux-stable-88c02b3f79a61e659749773865998e0c33247e86.tar.bz2 linux-stable-88c02b3f79a61e659749773865998e0c33247e86.zip | |
s390/sha3: Support sha3 performance enhancements
On newer machines the SHA3 performance of CPACF instructions KIMD and
KLMD can be enhanced by using additional modifier bits. This allows the
application to omit initializing the ICV, but also affects the internal
processing of the instructions. Performance is mostly gained when
processing short messages.
The new CPACF feature is backwards compatible with older machines, i.e.
the new modifier bits are ignored on older machines. However, to save the
ICV initialization, the application must detect the MSA level and omit
the ICV initialization only if this feature is supported.
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Joerg Schmidbauer <jschmidb@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/cpacf.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h index 2dbe2e2088bb..4b6a8c26e1ce 100644 --- a/arch/s390/include/asm/cpacf.h +++ b/arch/s390/include/asm/cpacf.h @@ -171,6 +171,14 @@ #define CPACF_KMA_LAAD 0x200 /* Last-AAD */ #define CPACF_KMA_HS 0x400 /* Hash-subkey Supplied */ +/* + * Flags for the KIMD/KLMD (COMPUTE INTERMEDIATE/LAST MESSAGE DIGEST) + * instructions + */ +#define CPACF_KIMD_NIP 0x8000 +#define CPACF_KLMD_DUFOP 0x4000 +#define CPACF_KLMD_NIP 0x8000 + typedef struct { unsigned char bytes[16]; } cpacf_mask_t; /* @@ -397,7 +405,7 @@ static inline void cpacf_kimd(unsigned long func, void *param, asm volatile( " lgr 0,%[fc]\n" " lgr 1,%[pba]\n" - "0: .insn rre,%[opc] << 16,0,%[src]\n" + "0: .insn rrf,%[opc] << 16,0,%[src],8,0\n" " brc 1,0b\n" /* handle partial completion */ : [src] "+&d" (s.pair) : [fc] "d" (func), [pba] "d" ((unsigned long)(param)), @@ -422,7 +430,7 @@ static inline void cpacf_klmd(unsigned long func, void *param, asm volatile( " lgr 0,%[fc]\n" " lgr 1,%[pba]\n" - "0: .insn rre,%[opc] << 16,0,%[src]\n" + "0: .insn rrf,%[opc] << 16,0,%[src],8,0\n" " brc 1,0b\n" /* handle partial completion */ : [src] "+&d" (s.pair) : [fc] "d" (func), [pba] "d" ((unsigned long)param), |