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Commit 2c2df118 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent abd1ecf2

arch/s390/include/asm/smp.h

+12 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/kernel/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/kernel/ipl.c

+23 −8
Original line number Diff line number Diff line
@@ -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)

arch/s390/kernel/machine_kexec.c

+8 −2
Original line number Diff line number Diff line
@@ -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);

}

arch/s390/kernel/smp.c

+35 −1
Original line number Diff line number Diff line
@@ -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) {