Commit 5d3f229f authored by Heiko Carstens's avatar Heiko Carstens Committed by Linus Torvalds
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[PATCH] s390: kexec fixes and improvements.



Disable pseudo page fault handling before starting the new kernel and try
to use diag308 to reset the machine.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 4374ae10
......@@ -70,6 +70,8 @@ machine_kexec(struct kimage *image)
for (;;);
}
extern void pfault_fini(void);
static void
kexec_halt_all_cpus(void *kernel_image)
{
......@@ -78,6 +80,11 @@ kexec_halt_all_cpus(void *kernel_image)
struct kimage *image;
relocate_kernel_t data_mover;
#ifdef CONFIG_PFAULT
if (MACHINE_IS_VM)
pfault_fini();
#endif
if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid))
signal_processor(smp_processor_id(), sigp_stop);
......
......@@ -4,6 +4,7 @@
* (C) Copyright IBM Corp. 2005
*
* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
* Heiko Carstens <heiko.carstens@de.ibm.com>
*
*/
......@@ -25,8 +26,31 @@
relocate_kernel:
basr %r13,0 #base address
.base:
spx zero64-.base(%r13) #absolute addressing mode
stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external)
spx zero64-.base(%r13) #absolute addressing mode
stctl %c0,%c15,ctlregs-.base(%r13)
stm %r0,%r15,gprregs-.base(%r13)
la %r1,load_psw-.base(%r13)
mvc 0(8,%r0),0(%r1)
la %r0,.back-.base(%r13)
st %r0,4(%r0)
oi 4(%r0),0x80
mvc 0x68(8,%r0),0(%r1)
la %r0,.back_pgm-.base(%r13)
st %r0,0x6c(%r0)
oi 0x6c(%r0),0x80
lhi %r0,0
diag %r0,%r0,0x308
.back:
basr %r13,0
.back_base:
oi have_diag308-.back_base(%r13),0x01
lctl %c0,%c15,ctlregs-.back_base(%r13)
lm %r0,%r15,gprregs-.back_base(%r13)
j .start_reloc
.back_pgm:
lm %r0,%r15,gprregs-.base(%r13)
.start_reloc:
lhi %r10,-1 #preparing the mask
sll %r10,12 #shift it such that it becomes 0xf000
.top:
......@@ -63,6 +87,10 @@
o %r3,4(%r4) #or load address into psw
st %r3,4(%r4)
mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0
tm have_diag308-.base(%r13),0x01
jno .no_diag308
diag %r0,%r0,0x308
.no_diag308:
sr %r1,%r1 #clear %r1
sr %r2,%r2 #clear %r2
sigp %r1,%r2,0x12 #set cpuid to zero
......@@ -75,6 +103,17 @@
.long 0x00080000,0x80000000
sys_msk:
.quad 0
ctlregs:
.rept 16
.long 0
.endr
gprregs:
.rept 16
.long 0
.endr
have_diag308:
.byte 0
.align 8
relocate_kernel_end:
.globl relocate_kernel_len
relocate_kernel_len:
......
......@@ -4,6 +4,7 @@
* (C) Copyright IBM Corp. 2005
*
* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
* Heiko Carstens <heiko.carstens@de.ibm.com>
*
*/
......@@ -26,8 +27,34 @@
relocate_kernel:
basr %r13,0 #base address
.base:
stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQs
spx zero64-.base(%r13) #absolute addressing mode
stnsm sys_msk-.base(%r13),0xf8 #disable DAT and IRQ (external)
stctg %c0,%c15,ctlregs-.base(%r13)
stmg %r0,%r15,gprregs-.base(%r13)
lghi %r0,3
sllg %r0,%r0,31
stg %r0,0x1d0(%r0)
la %r0,.back_pgm-.base(%r13)
stg %r0,0x1d8(%r0)
la %r1,load_psw-.base(%r13)
mvc 0(8,%r0),0(%r1)
la %r0,.back-.base(%r13)
st %r0,4(%r0)
oi 4(%r0),0x80
lghi %r0,0
diag %r0,%r0,0x308
.back:
lhi %r1,1 #mode 1 = esame
sigp %r1,%r0,0x12 #switch to esame mode
sam64 #switch to 64 bit addressing mode
basr %r13,0
.back_base:
oi have_diag308-.back_base(%r13),0x01
lctlg %c0,%c15,ctlregs-.back_base(%r13)
lmg %r0,%r15,gprregs-.back_base(%r13)
j .top
.back_pgm:
lmg %r0,%r15,gprregs-.base(%r13)
.top:
lghi %r7,4096 #load PAGE_SIZE in r7
lghi %r9,4096 #load PAGE_SIZE in r9
......@@ -62,6 +89,10 @@
o %r3,4(%r4) #or load address into psw
st %r3,4(%r4)
mvc 0(8,%r0),0(%r4) #copy psw to absolute address 0
tm have_diag308-.base(%r13),0x01
jno .no_diag308
diag %r0,%r0,0x308
.no_diag308:
sam31 #31 bit mode
sr %r1,%r1 #erase register r1
sr %r2,%r2 #erase register r2
......@@ -75,8 +106,18 @@
.long 0x00080000,0x80000000
sys_msk:
.quad 0
ctlregs:
.rept 16
.quad 0
.endr
gprregs:
.rept 16
.quad 0
.endr
have_diag308:
.byte 0
.align 8
relocate_kernel_end:
.globl relocate_kernel_len
relocate_kernel_len:
.quad relocate_kernel_end - relocate_kernel
......@@ -537,7 +537,8 @@ int __devinit start_secondary(void *cpuvoid)
#endif
#ifdef CONFIG_PFAULT
/* Enable pfault pseudo page faults on this cpu. */
pfault_init();
if (MACHINE_IS_VM)
pfault_init();
#endif
/* Mark this cpu as online */
cpu_set(smp_processor_id(), cpu_online_map);
......@@ -690,7 +691,8 @@ __cpu_disable(void)
#ifdef CONFIG_PFAULT
/* Disable pfault pseudo page faults on this cpu. */
pfault_fini();
if (MACHINE_IS_VM)
pfault_fini();
#endif
/* disable all external interrupts */
......
......@@ -29,6 +29,7 @@
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/reboot.h>
#include <asm/system.h>
#include <asm/uaccess.h>
......@@ -675,6 +676,19 @@ asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
panic("Corrupt kernel stack, can't continue.");
}
#ifndef CONFIG_ARCH_S390X
static int
pagex_reboot_event(struct notifier_block *this, unsigned long event, void *ptr)
{
if (MACHINE_IS_VM)
cpcmd("SET PAGEX OFF", NULL, 0, NULL);
return NOTIFY_DONE;
}
static struct notifier_block pagex_reboot_notifier = {
.notifier_call = &pagex_reboot_event,
};
#endif
/* init is done in lowcore.S and head.S */
......@@ -735,6 +749,7 @@ void __init trap_init(void)
&ext_int_pfault);
#endif
#ifndef CONFIG_ARCH_S390X
register_reboot_notifier(&pagex_reboot_notifier);
cpcmd("SET PAGEX ON", NULL, 0, NULL);
#endif
}
......
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