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[S390] smp: always reboot on cpu 0 

Always reboot on logical cpu 0. This makes sure that the IPL cpu is
always the same and usually avoids strange numbering schemes between
physical and logical cpus.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2010-02-26 22:37:34 +01:00 committed by Martin Schwidefsky
parent abd1ecf209
commit 2c2df118a6
7 changed files with 191 additions and 11 deletions
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12
arch/s390/include/asm/smp.h
View File

@ -31,6 +31,18 @@ extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *);
extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp,
int from, int to);
extern void smp_restart_cpu(void);
#else /* CONFIG_SMP */
static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
{
func(data);
}
#endif /* CONFIG_SMP */
#ifdef CONFIG_HOTPLUG_CPU

2
arch/s390/kernel/Makefile
View File

@ -32,6 +32,8 @@ extra-y += head.o init_task.o vmlinux.lds
obj-$(CONFIG_MODULES) += s390_ksyms.o module.o
obj-$(CONFIG_SMP) += smp.o topology.o
obj-$(CONFIG_SMP) += $(if $(CONFIG_64BIT),switch_cpu64.o, \
switch_cpu.o)
obj-$(CONFIG_HIBERNATION) += suspend.o swsusp_asm64.o
obj-$(CONFIG_AUDIT) += audit.o
compat-obj-$(CONFIG_AUDIT) += compat_audit.o

31
arch/s390/kernel/ipl.c
View File

@ -553,7 +553,7 @@ out:
return rc;
}
static void ipl_run(struct shutdown_trigger *trigger)
static void __ipl_run(void *unused)
{
diag308(DIAG308_IPL, NULL);
if (MACHINE_IS_VM)
@ -562,6 +562,11 @@ static void ipl_run(struct shutdown_trigger *trigger)
reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
}
static void ipl_run(struct shutdown_trigger *trigger)
{
smp_switch_to_ipl_cpu(__ipl_run, NULL);
}
static int __init ipl_init(void)
{
int rc;
@ -1039,7 +1044,7 @@ static void get_ipl_string(char *dst, struct ipl_parameter_block *ipb,
sprintf(dst + pos, " PARM %s", vmparm);
}
static void reipl_run(struct shutdown_trigger *trigger)
static void __reipl_run(void *unused)
{
struct ccw_dev_id devid;
static char buf[128];
@ -1087,6 +1092,11 @@ static void reipl_run(struct shutdown_trigger *trigger)
disabled_wait((unsigned long) __builtin_return_address(0));
}
static void reipl_run(struct shutdown_trigger *trigger)
{
smp_switch_to_ipl_cpu(__reipl_run, NULL);
}
static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
{
ipb->hdr.len = IPL_PARM_BLK_CCW_LEN;
@ -1369,20 +1379,18 @@ static struct kobj_attribute dump_type_attr =
static struct kset *dump_kset;
static void dump_run(struct shutdown_trigger *trigger)
static void __dump_run(void *unused)
{
struct ccw_dev_id devid;
static char buf[100];
switch (dump_method) {
case DUMP_METHOD_CCW_CIO:
smp_send_stop();
devid.devno = dump_block_ccw->ipl_info.ccw.devno;
devid.ssid = 0;
reipl_ccw_dev(&devid);
break;
case DUMP_METHOD_CCW_VM:
smp_send_stop();
sprintf(buf, "STORE STATUS");
__cpcmd(buf, NULL, 0, NULL);
sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
@ -1396,10 +1404,17 @@ static void dump_run(struct shutdown_trigger *trigger)
diag308(DIAG308_SET, dump_block_fcp);
diag308(DIAG308_DUMP, NULL);
break;
case DUMP_METHOD_NONE:
return;
default:
break;
}
printk(KERN_EMERG "Dump failed!\n");
}
static void dump_run(struct shutdown_trigger *trigger)
{
if (dump_method == DUMP_METHOD_NONE)
return;
smp_send_stop();
smp_switch_to_ipl_cpu(__dump_run, NULL);
}
static int __init dump_ccw_init(void)

10
arch/s390/kernel/machine_kexec.c
View File

@ -54,11 +54,11 @@ void machine_shutdown(void)
{
}
void machine_kexec(struct kimage *image)
static void __machine_kexec(void *data)
{
relocate_kernel_t data_mover;
struct kimage *image = data;
smp_send_stop();
pfault_fini();
s390_reset_system();
@ -68,3 +68,9 @@ void machine_kexec(struct kimage *image)
(*data_mover)(&image->head, image->start);
for (;;);
}
void machine_kexec(struct kimage *image)
{
smp_send_stop();
smp_switch_to_ipl_cpu(__machine_kexec, image);
}

36
arch/s390/kernel/smp.c
View File

@ -90,6 +90,39 @@ static int cpu_stopped(int cpu)
return 0;
}
void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
{
struct _lowcore *lc, *current_lc;
struct stack_frame *sf;
struct pt_regs *regs;
unsigned long sp;
if (smp_processor_id() == 0)
func(data);
__load_psw_mask(PSW_BASE_BITS | PSW_DEFAULT_KEY);
/* Disable lowcore protection */
__ctl_clear_bit(0, 28);
current_lc = lowcore_ptr[smp_processor_id()];
lc = lowcore_ptr[0];
if (!lc)
lc = current_lc;
lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu;
if (!cpu_online(0))
smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]);
while (signal_processor(0, sigp_stop_and_store_status) == sigp_busy)
cpu_relax();
sp = lc->panic_stack;
sp -= sizeof(struct pt_regs);
regs = (struct pt_regs *) sp;
memcpy(&regs->gprs, &current_lc->gpregs_save_area, sizeof(regs->gprs));
memcpy(&regs->psw, &current_lc->st_status_fixed_logout, sizeof(psw_t));
sp -= STACK_FRAME_OVERHEAD;
sf = (struct stack_frame *) sp;
sf->back_chain = regs->gprs[15];
smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]);
}
void smp_send_stop(void)
{
int cpu, rc;
@ -752,7 +785,8 @@ static ssize_t cpu_configure_store(struct sys_device *dev,
get_online_cpus();
mutex_lock(&smp_cpu_state_mutex);
rc = -EBUSY;
if (cpu_online(cpu))
/* disallow configuration changes of online cpus and cpu 0 */
if (cpu_online(cpu) || cpu == 0)
goto out;
rc = 0;
switch (val) {

59
arch/s390/kernel/switch_cpu.S Normal file
View File

@ -0,0 +1,59 @@
/*
* 31-bit switch cpu code
*
* Copyright IBM Corp. 2009
*
*/
#include <asm/asm-offsets.h>
#include <asm/lowcore.h>
#include <asm/ptrace.h>
# smp_switch_to_cpu switches to destination cpu and executes the passed function
# Parameter: %r2 - function to call
# %r3 - function parameter
# %r4 - stack poiner
# %r5 - current cpu
# %r6 - destination cpu
.section .text
.align 4
.globl smp_switch_to_cpu
smp_switch_to_cpu:
stm %r6,%r15,__SF_GPRS(%r15)
lr %r1,%r15
ahi %r15,-STACK_FRAME_OVERHEAD
st %r1,__SF_BACKCHAIN(%r15)
basr %r13,0
0: la %r1,.gprregs_addr-0b(%r13)
l %r1,0(%r1)
stm %r0,%r15,0(%r1)
1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */
brc 2,1b /* busy, try again */
2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */
brc 2,2b /* busy, try again */
3: j 3b
.globl smp_restart_cpu
smp_restart_cpu:
basr %r13,0
0: la %r1,.gprregs_addr-0b(%r13)
l %r1,0(%r1)
lm %r0,%r15,0(%r1)
1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */
brc 10,1b /* busy, accepted (status 0), running */
tmll %r0,0x40 /* Test if calling CPU is stopped */
jz 1b
ltr %r4,%r4 /* New stack ? */
jz 1f
lr %r15,%r4
1: basr %r14,%r2
.gprregs_addr:
.long .gprregs
.section .data,"aw",@progbits
.gprregs:
.rept 16
.long 0
.endr

52
arch/s390/kernel/switch_cpu64.S Normal file
View File

@ -0,0 +1,52 @@
/*
* 64-bit switch cpu code
*
* Copyright IBM Corp. 2009
*
*/
#include <asm/asm-offsets.h>
#include <asm/lowcore.h>
#include <asm/ptrace.h>
# smp_switch_to_cpu switches to destination cpu and executes the passed function
# Parameter: %r2 - function to call
# %r3 - function parameter
# %r4 - stack poiner
# %r5 - current cpu
# %r6 - destination cpu
.section .text
.align 4
.globl smp_switch_to_cpu
smp_switch_to_cpu:
stmg %r6,%r15,__SF_GPRS(%r15)
lgr %r1,%r15
aghi %r15,-STACK_FRAME_OVERHEAD
stg %r1,__SF_BACKCHAIN(%r15)
larl %r1,.gprregs
stmg %r0,%r15,0(%r1)
1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */
brc 2,1b /* busy, try again */
2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */
brc 2,2b /* busy, try again */
3: j 3b
.globl smp_restart_cpu
smp_restart_cpu:
larl %r1,.gprregs
lmg %r0,%r15,0(%r1)
1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */
brc 10,1b /* busy, accepted (status 0), running */
tmll %r0,0x40 /* Test if calling CPU is stopped */
jz 1b
ltgr %r4,%r4 /* New stack ? */
jz 1f
lgr %r15,%r4
1: basr %r14,%r2
.section .data,"aw",@progbits
.gprregs:
.rept 16
.quad 0
.endr