linux/arch/s390/kernel/smp.c

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/*
* arch/s390/kernel/smp.c
*
* Copyright (C) IBM Corp. 1999,2006
* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
* Martin Schwidefsky (schwidefsky@de.ibm.com)
* Heiko Carstens (heiko.carstens@de.ibm.com)
*
* based on other smp stuff by
* (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net>
* (c) 1998 Ingo Molnar
*
* We work with logical cpu numbering everywhere we can. The only
* functions using the real cpu address (got from STAP) are the sigp
* functions. For all other functions we use the identity mapping.
* That means that cpu_number_map[i] == i for every cpu. cpu_number_map is
* used e.g. to find the idle task belonging to a logical cpu. Every array
* in the kernel is sorted by the logical cpu number and not by the physical
* one which is causing all the confusion with __cpu_logical_map and
* cpu_number_map in other architectures.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/kernel_stat.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/cache.h>
#include <linux/interrupt.h>
#include <linux/cpu.h>
#include <asm/sigp.h>
#include <asm/pgalloc.h>
#include <asm/irq.h>
#include <asm/s390_ext.h>
#include <asm/cpcmd.h>
#include <asm/tlbflush.h>
extern volatile int __cpu_logical_map[];
/*
* An array with a pointer the lowcore of every CPU.
*/
struct _lowcore *lowcore_ptr[NR_CPUS];
cpumask_t cpu_online_map = CPU_MASK_NONE;
cpumask_t cpu_possible_map = CPU_MASK_NONE;
static struct task_struct *current_set[NR_CPUS];
/*
* Reboot, halt and power_off routines for SMP.
*/
extern char vmhalt_cmd[];
extern char vmpoff_cmd[];
static void smp_ext_bitcall(int, ec_bit_sig);
static void smp_ext_bitcall_others(ec_bit_sig);
/*
* Structure and data for smp_call_function(). This is designed to minimise
* static memory requirements. It also looks cleaner.
*/
static DEFINE_SPINLOCK(call_lock);
struct call_data_struct {
void (*func) (void *info);
void *info;
atomic_t started;
atomic_t finished;
int wait;
};
static struct call_data_struct * call_data;
/*
* 'Call function' interrupt callback
*/
static void do_call_function(void)
{
void (*func) (void *info) = call_data->func;
void *info = call_data->info;
int wait = call_data->wait;
atomic_inc(&call_data->started);
(*func)(info);
if (wait)
atomic_inc(&call_data->finished);
}
/*
* this function sends a 'generic call function' IPI to all other CPUs
* in the system.
*/
int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
int wait)
/*
* [SUMMARY] Run a function on all other CPUs.
* <func> The function to run. This must be fast and non-blocking.
* <info> An arbitrary pointer to pass to the function.
* <nonatomic> currently unused.
* <wait> If true, wait (atomically) until function has completed on other CPUs.
* [RETURNS] 0 on success, else a negative status code. Does not return until
* remote CPUs are nearly ready to execute <<func>> or are or have executed.
*
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler or from a bottom half handler.
*/
{
struct call_data_struct data;
int cpus = num_online_cpus()-1;
if (cpus <= 0)
return 0;
/* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled());
data.func = func;
data.info = info;
atomic_set(&data.started, 0);
data.wait = wait;
if (wait)
atomic_set(&data.finished, 0);
spin_lock(&call_lock);
call_data = &data;
/* Send a message to all other CPUs and wait for them to respond */
smp_ext_bitcall_others(ec_call_function);
/* Wait for response */
while (atomic_read(&data.started) != cpus)
cpu_relax();
if (wait)
while (atomic_read(&data.finished) != cpus)
cpu_relax();
spin_unlock(&call_lock);
return 0;
}
/*
* Call a function on one CPU
* cpu : the CPU the function should be executed on
*
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler. You may call it from a bottom half.
*
* It is guaranteed that the called function runs on the specified CPU,
* preemption is disabled.
*/
int smp_call_function_on(void (*func) (void *info), void *info,
int nonatomic, int wait, int cpu)
{
struct call_data_struct data;
int curr_cpu;
if (!cpu_online(cpu))
return -EINVAL;
/* disable preemption for local function call */
curr_cpu = get_cpu();
if (curr_cpu == cpu) {
/* direct call to function */
func(info);
put_cpu();
return 0;
}
data.func = func;
data.info = info;
atomic_set(&data.started, 0);
data.wait = wait;
if (wait)
atomic_set(&data.finished, 0);
spin_lock_bh(&call_lock);
call_data = &data;
smp_ext_bitcall(cpu, ec_call_function);
/* Wait for response */
while (atomic_read(&data.started) != 1)
cpu_relax();
if (wait)
while (atomic_read(&data.finished) != 1)
cpu_relax();
spin_unlock_bh(&call_lock);
put_cpu();
return 0;
}
EXPORT_SYMBOL(smp_call_function_on);
static inline void do_send_stop(void)
{
int cpu, rc;
/* stop all processors */
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
do {
rc = signal_processor(cpu, sigp_stop);
} while (rc == sigp_busy);
}
}
static inline void do_store_status(void)
{
int cpu, rc;
/* store status of all processors in their lowcores (real 0) */
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
do {
rc = signal_processor_p(
(__u32)(unsigned long) lowcore_ptr[cpu], cpu,
sigp_store_status_at_address);
} while(rc == sigp_busy);
}
}
/*
* this function sends a 'stop' sigp to all other CPUs in the system.
* it goes straight through.
*/
void smp_send_stop(void)
{
/* write magic number to zero page (absolute 0) */
lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC;
/* stop other processors. */
do_send_stop();
/* store status of other processors. */
do_store_status();
}
/*
* Reboot, halt and power_off routines for SMP.
*/
static void do_machine_restart(void * __unused)
{
int cpu;
static atomic_t cpuid = ATOMIC_INIT(-1);
if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
signal_processor(smp_processor_id(), sigp_stop);
/* Wait for all other cpus to enter stopped state */
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
while(!smp_cpu_not_running(cpu))
cpu_relax();
}
/* Store status of other cpus. */
do_store_status();
/*
* Finally call reipl. Because we waited for all other
* cpus to enter this function we know that they do
* not hold any s390irq-locks (the cpus have been
* interrupted by an external interrupt and s390irq
* locks are always held disabled).
*/
do_reipl();
}
void machine_restart_smp(char * __unused)
{
on_each_cpu(do_machine_restart, NULL, 0, 0);
}
static void do_wait_for_stop(void)
{
unsigned long cr[16];
__ctl_store(cr, 0, 15);
cr[0] &= ~0xffff;
cr[6] = 0;
__ctl_load(cr, 0, 15);
for (;;)
enabled_wait();
}
static void do_machine_halt(void * __unused)
{
static atomic_t cpuid = ATOMIC_INIT(-1);
if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) {
smp_send_stop();
if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
cpcmd(vmhalt_cmd, NULL, 0, NULL);
signal_processor(smp_processor_id(),
sigp_stop_and_store_status);
}
do_wait_for_stop();
}
void machine_halt_smp(void)
{
on_each_cpu(do_machine_halt, NULL, 0, 0);
}
static void do_machine_power_off(void * __unused)
{
static atomic_t cpuid = ATOMIC_INIT(-1);
if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) {
smp_send_stop();
if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
cpcmd(vmpoff_cmd, NULL, 0, NULL);
signal_processor(smp_processor_id(),
sigp_stop_and_store_status);
}
do_wait_for_stop();
}
void machine_power_off_smp(void)
{
on_each_cpu(do_machine_power_off, NULL, 0, 0);
}
/*
* This is the main routine where commands issued by other
* cpus are handled.
*/
void do_ext_call_interrupt(struct pt_regs *regs, __u16 code)
{
unsigned long bits;
/*
* handle bit signal external calls
*
* For the ec_schedule signal we have to do nothing. All the work
* is done automatically when we return from the interrupt.
*/
bits = xchg(&S390_lowcore.ext_call_fast, 0);
if (test_bit(ec_call_function, &bits))
do_call_function();
}
/*
* Send an external call sigp to another cpu and return without waiting
* for its completion.
*/
static void smp_ext_bitcall(int cpu, ec_bit_sig sig)
{
/*
* Set signaling bit in lowcore of target cpu and kick it
*/
set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
while(signal_processor(cpu, sigp_emergency_signal) == sigp_busy)
udelay(10);
}
/*
* Send an external call sigp to every other cpu in the system and
* return without waiting for its completion.
*/
static void smp_ext_bitcall_others(ec_bit_sig sig)
{
int cpu;
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
/*
* Set signaling bit in lowcore of target cpu and kick it
*/
set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy)
udelay(10);
}
}
#ifndef CONFIG_64BIT
/*
* this function sends a 'purge tlb' signal to another CPU.
*/
void smp_ptlb_callback(void *info)
{
local_flush_tlb();
}
void smp_ptlb_all(void)
{
on_each_cpu(smp_ptlb_callback, NULL, 0, 1);
}
EXPORT_SYMBOL(smp_ptlb_all);
#endif /* ! CONFIG_64BIT */
/*
* this function sends a 'reschedule' IPI to another CPU.
* it goes straight through and wastes no time serializing
* anything. Worst case is that we lose a reschedule ...
*/
void smp_send_reschedule(int cpu)
{
smp_ext_bitcall(cpu, ec_schedule);
}
/*
* parameter area for the set/clear control bit callbacks
*/
typedef struct
{
__u16 start_ctl;
__u16 end_ctl;
unsigned long orvals[16];
unsigned long andvals[16];
} ec_creg_mask_parms;
/*
* callback for setting/clearing control bits
*/
void smp_ctl_bit_callback(void *info) {
ec_creg_mask_parms *pp;
unsigned long cregs[16];
int i;
pp = (ec_creg_mask_parms *) info;
__ctl_store(cregs[pp->start_ctl], pp->start_ctl, pp->end_ctl);
for (i = pp->start_ctl; i <= pp->end_ctl; i++)
cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i];
__ctl_load(cregs[pp->start_ctl], pp->start_ctl, pp->end_ctl);
}
/*
* Set a bit in a control register of all cpus
*/
void smp_ctl_set_bit(int cr, int bit) {
ec_creg_mask_parms parms;
parms.start_ctl = cr;
parms.end_ctl = cr;
parms.orvals[cr] = 1 << bit;
parms.andvals[cr] = -1L;
preempt_disable();
smp_call_function(smp_ctl_bit_callback, &parms, 0, 1);
__ctl_set_bit(cr, bit);
preempt_enable();
}
/*
* Clear a bit in a control register of all cpus
*/
void smp_ctl_clear_bit(int cr, int bit) {
ec_creg_mask_parms parms;
parms.start_ctl = cr;
parms.end_ctl = cr;
parms.orvals[cr] = 0;
parms.andvals[cr] = ~(1L << bit);
preempt_disable();
smp_call_function(smp_ctl_bit_callback, &parms, 0, 1);
__ctl_clear_bit(cr, bit);
preempt_enable();
}
/*
* Lets check how many CPUs we have.
*/
static unsigned int
__init smp_count_cpus(void)
{
unsigned int cpu, num_cpus;
__u16 boot_cpu_addr;
/*
* cpu 0 is the boot cpu. See smp_prepare_boot_cpu.
*/
boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;
current_thread_info()->cpu = 0;
num_cpus = 1;
for (cpu = 0; cpu <= 65535; cpu++) {
if ((__u16) cpu == boot_cpu_addr)
continue;
__cpu_logical_map[1] = (__u16) cpu;
if (signal_processor(1, sigp_sense) ==
sigp_not_operational)
continue;
num_cpus++;
}
printk("Detected %d CPU's\n",(int) num_cpus);
printk("Boot cpu address %2X\n", boot_cpu_addr);
return num_cpus;
}
/*
* Activate a secondary processor.
*/
extern void init_cpu_timer(void);
extern void init_cpu_vtimer(void);
extern int pfault_init(void);
extern void pfault_fini(void);
int __devinit start_secondary(void *cpuvoid)
{
/* Setup the cpu */
cpu_init();
preempt_disable();
/* init per CPU timer */
init_cpu_timer();
#ifdef CONFIG_VIRT_TIMER
init_cpu_vtimer();
#endif
#ifdef CONFIG_PFAULT
/* Enable pfault pseudo page faults on this cpu. */
if (MACHINE_IS_VM)
pfault_init();
#endif
/* Mark this cpu as online */
cpu_set(smp_processor_id(), cpu_online_map);
/* Switch on interrupts */
local_irq_enable();
/* Print info about this processor */
print_cpu_info(&S390_lowcore.cpu_data);
/* cpu_idle will call schedule for us */
cpu_idle();
return 0;
}
static void __init smp_create_idle(unsigned int cpu)
{
struct task_struct *p;
/*
* don't care about the psw and regs settings since we'll never
* reschedule the forked task.
*/
p = fork_idle(cpu);
if (IS_ERR(p))
panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p));
current_set[cpu] = p;
}
/* Reserving and releasing of CPUs */
static DEFINE_SPINLOCK(smp_reserve_lock);
static int smp_cpu_reserved[NR_CPUS];
int
smp_get_cpu(cpumask_t cpu_mask)
{
unsigned long flags;
int cpu;
spin_lock_irqsave(&smp_reserve_lock, flags);
/* Try to find an already reserved cpu. */
for_each_cpu_mask(cpu, cpu_mask) {
if (smp_cpu_reserved[cpu] != 0) {
smp_cpu_reserved[cpu]++;
/* Found one. */
goto out;
}
}
/* Reserve a new cpu from cpu_mask. */
for_each_cpu_mask(cpu, cpu_mask) {
if (cpu_online(cpu)) {
smp_cpu_reserved[cpu]++;
goto out;
}
}
cpu = -ENODEV;
out:
spin_unlock_irqrestore(&smp_reserve_lock, flags);
return cpu;
}
void
smp_put_cpu(int cpu)
{
unsigned long flags;
spin_lock_irqsave(&smp_reserve_lock, flags);
smp_cpu_reserved[cpu]--;
spin_unlock_irqrestore(&smp_reserve_lock, flags);
}
static inline int
cpu_stopped(int cpu)
{
__u32 status;
/* Check for stopped state */
if (signal_processor_ps(&status, 0, cpu, sigp_sense) == sigp_status_stored) {
if (status & 0x40)
return 1;
}
return 0;
}
/* Upping and downing of CPUs */
int
__cpu_up(unsigned int cpu)
{
struct task_struct *idle;
struct _lowcore *cpu_lowcore;
struct stack_frame *sf;
sigp_ccode ccode;
int curr_cpu;
for (curr_cpu = 0; curr_cpu <= 65535; curr_cpu++) {
__cpu_logical_map[cpu] = (__u16) curr_cpu;
if (cpu_stopped(cpu))
break;
}
if (!cpu_stopped(cpu))
return -ENODEV;
ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]),
cpu, sigp_set_prefix);
if (ccode){
printk("sigp_set_prefix failed for cpu %d "
"with condition code %d\n",
(int) cpu, (int) ccode);
return -EIO;
}
idle = current_set[cpu];
cpu_lowcore = lowcore_ptr[cpu];
cpu_lowcore->kernel_stack = (unsigned long)
task_stack_page(idle) + (THREAD_SIZE);
sf = (struct stack_frame *) (cpu_lowcore->kernel_stack
- sizeof(struct pt_regs)
- sizeof(struct stack_frame));
memset(sf, 0, sizeof(struct stack_frame));
sf->gprs[9] = (unsigned long) sf;
cpu_lowcore->save_area[15] = (unsigned long) sf;
__ctl_store(cpu_lowcore->cregs_save_area[0], 0, 15);
__asm__ __volatile__("stam 0,15,0(%0)"
: : "a" (&cpu_lowcore->access_regs_save_area)
: "memory");
cpu_lowcore->percpu_offset = __per_cpu_offset[cpu];
cpu_lowcore->current_task = (unsigned long) idle;
cpu_lowcore->cpu_data.cpu_nr = cpu;
eieio();
while (signal_processor(cpu,sigp_restart) == sigp_busy)
udelay(10);
while (!cpu_online(cpu))
cpu_relax();
return 0;
}
static unsigned int __initdata additional_cpus;
static unsigned int __initdata possible_cpus;
void __init smp_setup_cpu_possible_map(void)
{
unsigned int phy_cpus, pos_cpus, cpu;
phy_cpus = smp_count_cpus();
pos_cpus = min(phy_cpus + additional_cpus, (unsigned int) NR_CPUS);
if (possible_cpus)
pos_cpus = min(possible_cpus, (unsigned int) NR_CPUS);
for (cpu = 0; cpu < pos_cpus; cpu++)
cpu_set(cpu, cpu_possible_map);
phy_cpus = min(phy_cpus, pos_cpus);
for (cpu = 0; cpu < phy_cpus; cpu++)
cpu_set(cpu, cpu_present_map);
}
#ifdef CONFIG_HOTPLUG_CPU
static int __init setup_additional_cpus(char *s)
{
additional_cpus = simple_strtoul(s, NULL, 0);
return 0;
}
early_param("additional_cpus", setup_additional_cpus);
static int __init setup_possible_cpus(char *s)
{
possible_cpus = simple_strtoul(s, NULL, 0);
return 0;
}
early_param("possible_cpus", setup_possible_cpus);
int
__cpu_disable(void)
{
unsigned long flags;
ec_creg_mask_parms cr_parms;
[PATCH] i386 CPU hotplug (The i386 CPU hotplug patch provides infrastructure for some work which Pavel is doing as well as for ACPI S3 (suspend-to-RAM) work which Li Shaohua <shaohua.li@intel.com> is doing) The following provides i386 architecture support for safely unregistering and registering processors during runtime, updated for the current -mm tree. In order to avoid dumping cpu hotplug code into kernel/irq/* i dropped the cpu_online check in do_IRQ() by modifying fixup_irqs(). The difference being that on cpu offline, fixup_irqs() is called before we clear the cpu from cpu_online_map and a long delay in order to ensure that we never have any queued external interrupts on the APICs. There are additional changes to s390 and ppc64 to account for this change. 1) Add CONFIG_HOTPLUG_CPU 2) disable local APIC timer on dead cpus. 3) Disable preempt around irq balancing to prevent CPUs going down. 4) Print irq stats for all possible cpus. 5) Debugging check for interrupts on offline cpus. 6) Hacky fixup_irqs() to redirect irqs when cpus go off/online. 7) play_dead() for offline cpus to spin inside. 8) Handle offline cpus set in flush_tlb_others(). 9) Grab lock earlier in smp_call_function() to prevent CPUs going down. 10) Implement __cpu_disable() and __cpu_die(). 11) Enable local interrupts in cpu_enable() after fixup_irqs() 12) Don't fiddle with NMI on dead cpu, but leave intact on other cpus. 13) Program IRQ affinity whilst cpu is still in cpu_online_map on offline. Signed-off-by: Zwane Mwaikambo <zwane@linuxpower.ca> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 23:54:50 +02:00
int cpu = smp_processor_id();
spin_lock_irqsave(&smp_reserve_lock, flags);
[PATCH] i386 CPU hotplug (The i386 CPU hotplug patch provides infrastructure for some work which Pavel is doing as well as for ACPI S3 (suspend-to-RAM) work which Li Shaohua <shaohua.li@intel.com> is doing) The following provides i386 architecture support for safely unregistering and registering processors during runtime, updated for the current -mm tree. In order to avoid dumping cpu hotplug code into kernel/irq/* i dropped the cpu_online check in do_IRQ() by modifying fixup_irqs(). The difference being that on cpu offline, fixup_irqs() is called before we clear the cpu from cpu_online_map and a long delay in order to ensure that we never have any queued external interrupts on the APICs. There are additional changes to s390 and ppc64 to account for this change. 1) Add CONFIG_HOTPLUG_CPU 2) disable local APIC timer on dead cpus. 3) Disable preempt around irq balancing to prevent CPUs going down. 4) Print irq stats for all possible cpus. 5) Debugging check for interrupts on offline cpus. 6) Hacky fixup_irqs() to redirect irqs when cpus go off/online. 7) play_dead() for offline cpus to spin inside. 8) Handle offline cpus set in flush_tlb_others(). 9) Grab lock earlier in smp_call_function() to prevent CPUs going down. 10) Implement __cpu_disable() and __cpu_die(). 11) Enable local interrupts in cpu_enable() after fixup_irqs() 12) Don't fiddle with NMI on dead cpu, but leave intact on other cpus. 13) Program IRQ affinity whilst cpu is still in cpu_online_map on offline. Signed-off-by: Zwane Mwaikambo <zwane@linuxpower.ca> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 23:54:50 +02:00
if (smp_cpu_reserved[cpu] != 0) {
spin_unlock_irqrestore(&smp_reserve_lock, flags);
return -EBUSY;
}
[PATCH] i386 CPU hotplug (The i386 CPU hotplug patch provides infrastructure for some work which Pavel is doing as well as for ACPI S3 (suspend-to-RAM) work which Li Shaohua <shaohua.li@intel.com> is doing) The following provides i386 architecture support for safely unregistering and registering processors during runtime, updated for the current -mm tree. In order to avoid dumping cpu hotplug code into kernel/irq/* i dropped the cpu_online check in do_IRQ() by modifying fixup_irqs(). The difference being that on cpu offline, fixup_irqs() is called before we clear the cpu from cpu_online_map and a long delay in order to ensure that we never have any queued external interrupts on the APICs. There are additional changes to s390 and ppc64 to account for this change. 1) Add CONFIG_HOTPLUG_CPU 2) disable local APIC timer on dead cpus. 3) Disable preempt around irq balancing to prevent CPUs going down. 4) Print irq stats for all possible cpus. 5) Debugging check for interrupts on offline cpus. 6) Hacky fixup_irqs() to redirect irqs when cpus go off/online. 7) play_dead() for offline cpus to spin inside. 8) Handle offline cpus set in flush_tlb_others(). 9) Grab lock earlier in smp_call_function() to prevent CPUs going down. 10) Implement __cpu_disable() and __cpu_die(). 11) Enable local interrupts in cpu_enable() after fixup_irqs() 12) Don't fiddle with NMI on dead cpu, but leave intact on other cpus. 13) Program IRQ affinity whilst cpu is still in cpu_online_map on offline. Signed-off-by: Zwane Mwaikambo <zwane@linuxpower.ca> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 23:54:50 +02:00
cpu_clear(cpu, cpu_online_map);
#ifdef CONFIG_PFAULT
/* Disable pfault pseudo page faults on this cpu. */
if (MACHINE_IS_VM)
pfault_fini();
#endif
/* disable all external interrupts */
cr_parms.start_ctl = 0;
cr_parms.end_ctl = 0;
cr_parms.orvals[0] = 0;
cr_parms.andvals[0] = ~(1<<15 | 1<<14 | 1<<13 | 1<<12 |
1<<11 | 1<<10 | 1<< 6 | 1<< 4);
smp_ctl_bit_callback(&cr_parms);
/* disable all I/O interrupts */
cr_parms.start_ctl = 6;
cr_parms.end_ctl = 6;
cr_parms.orvals[6] = 0;
cr_parms.andvals[6] = ~(1<<31 | 1<<30 | 1<<29 | 1<<28 |
1<<27 | 1<<26 | 1<<25 | 1<<24);
smp_ctl_bit_callback(&cr_parms);
/* disable most machine checks */
cr_parms.start_ctl = 14;
cr_parms.end_ctl = 14;
cr_parms.orvals[14] = 0;
cr_parms.andvals[14] = ~(1<<28 | 1<<27 | 1<<26 | 1<<25 | 1<<24);
smp_ctl_bit_callback(&cr_parms);
spin_unlock_irqrestore(&smp_reserve_lock, flags);
return 0;
}
void
__cpu_die(unsigned int cpu)
{
/* Wait until target cpu is down */
while (!smp_cpu_not_running(cpu))
cpu_relax();
printk("Processor %d spun down\n", cpu);
}
void
cpu_die(void)
{
idle_task_exit();
signal_processor(smp_processor_id(), sigp_stop);
BUG();
for(;;);
}
#endif /* CONFIG_HOTPLUG_CPU */
/*
* Cycle through the processors and setup structures.
*/
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned long stack;
unsigned int cpu;
int i;
/* request the 0x1201 emergency signal external interrupt */
if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0)
panic("Couldn't request external interrupt 0x1201");
memset(lowcore_ptr,0,sizeof(lowcore_ptr));
/*
* Initialize prefix pages and stacks for all possible cpus
*/
print_cpu_info(&S390_lowcore.cpu_data);
for_each_possible_cpu(i) {
lowcore_ptr[i] = (struct _lowcore *)
__get_free_pages(GFP_KERNEL|GFP_DMA,
sizeof(void*) == 8 ? 1 : 0);
stack = __get_free_pages(GFP_KERNEL,ASYNC_ORDER);
if (lowcore_ptr[i] == NULL || stack == 0ULL)
panic("smp_boot_cpus failed to allocate memory\n");
*(lowcore_ptr[i]) = S390_lowcore;
lowcore_ptr[i]->async_stack = stack + (ASYNC_SIZE);
stack = __get_free_pages(GFP_KERNEL,0);
if (stack == 0ULL)
panic("smp_boot_cpus failed to allocate memory\n");
lowcore_ptr[i]->panic_stack = stack + (PAGE_SIZE);
#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE) {
lowcore_ptr[i]->extended_save_area_addr =
(__u32) __get_free_pages(GFP_KERNEL,0);
if (lowcore_ptr[i]->extended_save_area_addr == 0)
panic("smp_boot_cpus failed to "
"allocate memory\n");
}
#endif
}
#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE)
ctl_set_bit(14, 29); /* enable extended save area */
#endif
set_prefix((u32)(unsigned long) lowcore_ptr[smp_processor_id()]);
for_each_possible_cpu(cpu)
if (cpu != smp_processor_id())
smp_create_idle(cpu);
}
void __devinit smp_prepare_boot_cpu(void)
{
BUG_ON(smp_processor_id() != 0);
cpu_set(0, cpu_online_map);
S390_lowcore.percpu_offset = __per_cpu_offset[0];
current_set[0] = current;
}
void smp_cpus_done(unsigned int max_cpus)
{
cpu_present_map = cpu_possible_map;
}
/*
* the frequency of the profiling timer can be changed
* by writing a multiplier value into /proc/profile.
*
* usually you want to run this on all CPUs ;)
*/
int setup_profiling_timer(unsigned int multiplier)
{
return 0;
}
static DEFINE_PER_CPU(struct cpu, cpu_devices);
static int __init topology_init(void)
{
int cpu;
int ret;
for_each_possible_cpu(cpu) {
[PATCH] node hotplug: register cpu: remove node struct With Goto-san's patch, we can add new pgdat/node at runtime. I'm now considering node-hot-add with cpu + memory on ACPI. I found acpi container, which describes node, could evaluate cpu before memory. This means cpu-hot-add occurs before memory hot add. In most part, cpu-hot-add doesn't depend on node hot add. But register_cpu(), which creates symbolic link from node to cpu, requires that node should be onlined before register_cpu(). When a node is onlined, its pgdat should be there. This patch-set holds off creating symbolic link from node to cpu until node is onlined. This removes node arguments from register_cpu(). Now, register_cpu() requires 'struct node' as its argument. But the array of struct node is now unified in driver/base/node.c now (By Goto's node hotplug patch). We can get struct node in generic way. So, this argument is not necessary now. This patch also guarantees add cpu under node only when node is onlined. It is necessary for node-hot-add vs. cpu-hot-add patch following this. Moreover, register_cpu calculates cpu->node_id by cpu_to_node() without regard to its 'struct node *root' argument. This patch removes it. Also modify callers of register_cpu()/unregister_cpu, whose args are changed by register-cpu-remove-node-struct patch. [Brice.Goglin@ens-lyon.org: fix it] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Ashok Raj <ashok.raj@intel.com> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Brice Goglin <Brice.Goglin@ens-lyon.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-27 11:53:41 +02:00
ret = register_cpu(&per_cpu(cpu_devices, cpu), cpu);
if (ret)
printk(KERN_WARNING "topology_init: register_cpu %d "
"failed (%d)\n", cpu, ret);
}
return 0;
}
subsys_initcall(topology_init);
EXPORT_SYMBOL(cpu_online_map);
EXPORT_SYMBOL(cpu_possible_map);
EXPORT_SYMBOL(lowcore_ptr);
EXPORT_SYMBOL(smp_ctl_set_bit);
EXPORT_SYMBOL(smp_ctl_clear_bit);
EXPORT_SYMBOL(smp_call_function);
EXPORT_SYMBOL(smp_get_cpu);
EXPORT_SYMBOL(smp_put_cpu);