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s390/lpp: use assembler alternatives for the LPP instruction 

With the new macros for CPU alternatives the MACHINE_FLAG_LPP check
around the LPP instruction can be optimized. After this is done the
flag can be removed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2018-03-26 15:23:33 +02:00
parent b058661a99
commit e5b98199de
4 changed files with 8 additions and 14 deletions
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4
arch/s390/include/asm/cpu_mf.h
View File

@ -29,12 +29,12 @@
/* CPU measurement facility support */
static inline int cpum_cf_avail(void)
{
return MACHINE_HAS_LPP && test_facility(67);
return test_facility(40) && test_facility(67);
}
static inline int cpum_sf_avail(void)
{
return MACHINE_HAS_LPP && test_facility(68);
return test_facility(40) && test_facility(68);
}

2
arch/s390/include/asm/setup.h
View File

@ -25,7 +25,6 @@
#define MACHINE_FLAG_DIAG44 _BITUL(6)
#define MACHINE_FLAG_EDAT1 _BITUL(7)
#define MACHINE_FLAG_EDAT2 _BITUL(8)
#define MACHINE_FLAG_LPP _BITUL(9)
#define MACHINE_FLAG_TOPOLOGY _BITUL(10)
#define MACHINE_FLAG_TE _BITUL(11)
#define MACHINE_FLAG_TLB_LC _BITUL(12)
@ -66,7 +65,6 @@ extern void detect_memory_memblock(void);
#define MACHINE_HAS_DIAG44 (S390_lowcore.machine_flags & MACHINE_FLAG_DIAG44)
#define MACHINE_HAS_EDAT1 (S390_lowcore.machine_flags & MACHINE_FLAG_EDAT1)
#define MACHINE_HAS_EDAT2 (S390_lowcore.machine_flags & MACHINE_FLAG_EDAT2)
#define MACHINE_HAS_LPP (S390_lowcore.machine_flags & MACHINE_FLAG_LPP)
#define MACHINE_HAS_TOPOLOGY (S390_lowcore.machine_flags & MACHINE_FLAG_TOPOLOGY)
#define MACHINE_HAS_TE (S390_lowcore.machine_flags & MACHINE_FLAG_TE)
#define MACHINE_HAS_TLB_LC (S390_lowcore.machine_flags & MACHINE_FLAG_TLB_LC)

2
arch/s390/kernel/early.c
View File

@ -242,8 +242,6 @@ static __init void detect_machine_facilities(void)
S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
if (test_facility(3))
S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
if (test_facility(40))
S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
if (test_facility(50) && test_facility(73)) {
S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
__ctl_set_bit(0, 55);

14
arch/s390/kernel/entry.S
View File

@ -58,6 +58,8 @@ _CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | \
_CIF_ASCE_SECONDARY | _CIF_FPU)
_PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
_LPP_OFFSET = __LC_LPP
#define BASED(name) name-cleanup_critical(%r13)
.macro TRACE_IRQS_ON
@ -281,10 +283,8 @@ ENTRY(__switch_to)
aghi %r3,__TASK_pid
mvc __LC_CURRENT_PID(4,%r0),0(%r3) # store pid of next
lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
jz 0f
.insn s,0xb2800000,__LC_LPP # set program parameter
0: BR_R1USE_R14
ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40
BR_R1USE_R14
.L__critical_start:
@ -1243,10 +1243,8 @@ ENTRY(mcck_int_handler)
# PSW restart interrupt handler
#
ENTRY(restart_int_handler)
TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
jz 0f
.insn s,0xb2800000,__LC_LPP
0: stg %r15,__LC_SAVE_AREA_RESTART
ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40
stg %r15,__LC_SAVE_AREA_RESTART
lg %r15,__LC_RESTART_STACK
aghi %r15,-__PT_SIZE # create pt_regs on stack
xc 0(__PT_SIZE,%r15),0(%r15)