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[S390] Use diagnose 308 for system reset

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The diagnose 308 call is the prefered method for clearing all ongoing I/O.
Therefore if it is available we use it instead of doing a manual reset.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Michael Holzheu 2011-08-03 16:44:22 +02:00 committed by Heiko Carstens
parent ef1daec8da
commit 9dc7356ee1
3 changed files with 43 additions and 0 deletions
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1
arch/s390/include/asm/ipl.h
View File

@ -167,5 +167,6 @@ enum diag308_rc {
};
extern int diag308(unsigned long subcode, void *addr);
extern void diag308_reset(void);
#endif /* _ASM_S390_IPL_H */

36
arch/s390/kernel/base.S
View File

@ -76,6 +76,42 @@ s390_base_pgm_handler_fn:
.quad 0
.previous
#
# Calls diag 308 subcode 1 and continues execution
#
# The following conditions must be ensured before calling this function:
# * Prefix register = 0
# * Lowcore protection is disabled
#
ENTRY(diag308_reset)
larl %r4,.Lctlregs # Save control registers
stctg %c0,%c15,0(%r4)
larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0
lghi %r3,0
lg %r4,0(%r4) # Save PSW
sturg %r4,%r3 # Use sturg, because of large pages
lghi %r1,1
diag %r1,%r1,0x308
.Lrestart_part2:
lhi %r0,0 # Load r0 with zero
lhi %r1,2 # Use mode 2 = ESAME (dump)
sigp %r1,%r0,0x12 # Switch to ESAME mode
sam64 # Switch to 64 bit addressing mode
larl %r4,.Lctlregs # Restore control registers
lctlg %c0,%c15,0(%r4)
br %r14
.align 16
.Lrestart_psw:
.long 0x00080000,0x80000000 + .Lrestart_part2
.section .bss
.align 8
.Lctlregs:
.rept 16
.quad 0
.endr
.previous
#else /* CONFIG_64BIT */
ENTRY(s390_base_mcck_handler)

6
arch/s390/kernel/ipl.c
View File

@ -1996,6 +1996,12 @@ static void do_reset_calls(void)
{
struct reset_call *reset;
#ifdef CONFIG_64BIT
if (diag308_set_works) {
diag308_reset();
return;
}
#endif
list_for_each_entry(reset, &rcall, list)
reset->fn();
}