/*
* arch/s390/kernel/smp.c
*
- * Copyright (C) IBM Corp. 1999,2006
+ * Copyright IBM Corp. 1999,2007
* 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)
+ * Martin Schwidefsky (schwidefsky@de.ibm.com)
+ * Heiko Carstens (heiko.carstens@de.ibm.com)
*
- * based on other smp stuff by
+ * based on other smp stuff by
* (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net>
* (c) 1998 Ingo Molnar
*
#include <linux/module.h>
#include <linux/init.h>
-
#include <linux/mm.h>
+#include <linux/err.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 <linux/timex.h>
+#include <linux/bootmem.h>
+#include <asm/ipl.h>
+#include <asm/setup.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[];
+#include <asm/timer.h>
+#include <asm/lowcore.h>
+#include <asm/sclp.h>
+#include <asm/cpu.h>
/*
* An array with a pointer the lowcore of every CPU.
*/
-
struct _lowcore *lowcore_ptr[NR_CPUS];
+EXPORT_SYMBOL(lowcore_ptr);
cpumask_t cpu_online_map = CPU_MASK_NONE;
-cpumask_t cpu_possible_map = CPU_MASK_NONE;
+EXPORT_SYMBOL(cpu_online_map);
+
+cpumask_t cpu_possible_map = CPU_MASK_ALL;
+EXPORT_SYMBOL(cpu_possible_map);
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 u8 smp_cpu_type;
+static int smp_use_sigp_detection;
+
+enum s390_cpu_state {
+ CPU_STATE_STANDBY,
+ CPU_STATE_CONFIGURED,
+};
+
+#ifdef CONFIG_HOTPLUG_CPU
+static DEFINE_MUTEX(smp_cpu_state_mutex);
+#endif
+static int smp_cpu_state[NR_CPUS];
-extern void reipl(unsigned long devno);
-extern void reipl_diag(void);
+static DEFINE_PER_CPU(struct cpu, cpu_devices);
+DEFINE_PER_CPU(struct s390_idle_data, s390_idle);
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.
+ * Structure and data for __smp_call_function_map(). 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;
+ cpumask_t started;
+ cpumask_t finished;
int wait;
};
-static struct call_data_struct * call_data;
+static struct call_data_struct *call_data;
/*
* 'Call function' interrupt callback
void *info = call_data->info;
int wait = call_data->wait;
- atomic_inc(&call_data->started);
+ cpu_set(smp_processor_id(), call_data->started);
(*func)(info);
if (wait)
- atomic_inc(&call_data->finished);
+ cpu_set(smp_processor_id(), 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.
- */
+static void __smp_call_function_map(void (*func) (void *info), void *info,
+ int nonatomic, int wait, cpumask_t map)
{
struct call_data_struct data;
- int cpus = num_online_cpus()-1;
+ int cpu, local = 0;
- if (cpus <= 0)
- return 0;
+ /*
+ * Can deadlock when interrupts are disabled or if in wrong context.
+ */
+ WARN_ON(irqs_disabled() || in_irq());
+
+ /*
+ * Check for local function call. We have to have the same call order
+ * as in on_each_cpu() because of machine_restart_smp().
+ */
+ if (cpu_isset(smp_processor_id(), map)) {
+ local = 1;
+ cpu_clear(smp_processor_id(), map);
+ }
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
+ cpus_and(map, map, cpu_online_map);
+ if (cpus_empty(map))
+ goto out;
data.func = func;
data.info = info;
- atomic_set(&data.started, 0);
+ data.started = CPU_MASK_NONE;
data.wait = wait;
if (wait)
- atomic_set(&data.finished, 0);
+ data.finished = CPU_MASK_NONE;
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);
+
+ for_each_cpu_mask(cpu, map)
+ smp_ext_bitcall(cpu, ec_call_function);
/* Wait for response */
- while (atomic_read(&data.started) != cpus)
+ while (!cpus_equal(map, data.started))
cpu_relax();
-
if (wait)
- while (atomic_read(&data.finished) != cpus)
+ while (!cpus_equal(map, data.finished))
cpu_relax();
spin_unlock(&call_lock);
-
- return 0;
+out:
+ if (local) {
+ local_irq_disable();
+ func(info);
+ local_irq_enable();
+ }
}
/*
- * Call a function on one CPU
- * cpu : the CPU the function should be executed on
+ * smp_call_function:
+ * @func: the function to run; this must be fast and non-blocking
+ * @info: an arbitrary pointer to pass to the function
+ * @nonatomic: unused
+ * @wait: if true, wait (atomically) until function has completed on other CPUs
*
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler. You may call it from a bottom half.
+ * Run a function on all other CPUs.
*
- * It is guaranteed that the called function runs on the specified CPU,
- * preemption is disabled.
+ * You must not call this function with disabled interrupts, from a
+ * hardware interrupt handler or from a bottom half.
*/
-int smp_call_function_on(void (*func) (void *info), void *info,
- int nonatomic, int wait, int cpu)
+int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
+ int wait)
{
- struct call_data_struct data;
- int curr_cpu;
-
- if (!cpu_online(cpu))
- return -EINVAL;
-
- /* disable preemption for local function call */
- curr_cpu = get_cpu();
+ cpumask_t map;
- 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();
+ preempt_disable();
+ map = cpu_online_map;
+ cpu_clear(smp_processor_id(), map);
+ __smp_call_function_map(func, info, nonatomic, wait, map);
+ preempt_enable();
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);
- }
-}
+EXPORT_SYMBOL(smp_call_function);
/*
- * this function sends a 'stop' sigp to all other CPUs in the system.
- * it goes straight through.
+ * smp_call_function_single:
+ * @cpu: the CPU where func should run
+ * @func: the function to run; this must be fast and non-blocking
+ * @info: an arbitrary pointer to pass to the function
+ * @nonatomic: unused
+ * @wait: if true, wait (atomically) until function has completed on other CPUs
+ *
+ * Run a function on one processor.
+ *
+ * You must not call this function with disabled interrupts, from a
+ * hardware interrupt handler or from a bottom half.
*/
-void smp_send_stop(void)
+int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
+ int nonatomic, int wait)
{
- /* 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();
+ preempt_disable();
+ __smp_call_function_map(func, info, nonatomic, wait,
+ cpumask_of_cpu(cpu));
+ preempt_enable();
+ return 0;
}
+EXPORT_SYMBOL(smp_call_function_single);
-/*
- * Reboot, halt and power_off routines for SMP.
- */
-
-static void do_machine_restart(void * __unused)
+void smp_send_stop(void)
{
- int cpu;
- static atomic_t cpuid = ATOMIC_INIT(-1);
+ int cpu, rc;
+
+ /* Disable all interrupts/machine checks */
+ __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
- if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
- signal_processor(smp_processor_id(), sigp_stop);
+ /* write magic number to zero page (absolute 0) */
+ lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC;
- /* Wait for all other cpus to enter stopped state */
+ /* stop all processors */
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).
- */
- reipl_diag();
-
- if (MACHINE_IS_VM)
- cpcmd ("IPL", NULL, 0, NULL);
- else
- reipl (0x10000 | S390_lowcore.ipl_device);
-}
-
-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);
+ do {
+ rc = signal_processor(cpu, sigp_stop);
+ } while (rc == sigp_busy);
- 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);
+ while (!smp_cpu_not_running(cpu))
+ cpu_relax();
}
- do_wait_for_stop();
-}
-
-void machine_power_off_smp(void)
-{
- on_each_cpu(do_machine_power_off, NULL, 0, 0);
}
/*
* cpus are handled.
*/
-void do_ext_call_interrupt(struct pt_regs *regs, __u16 code)
+static void do_ext_call_interrupt(__u16 code)
{
- unsigned long bits;
+ 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.
- */
+ /*
+ * 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))
+ if (test_bit(ec_call_function, &bits))
do_call_function();
}
*/
static void smp_ext_bitcall(int cpu, ec_bit_sig sig)
{
- /*
- * Set signaling bit in lowcore of target cpu and kick it
- */
+ /*
+ * 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)
+ 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();
+ __tlb_flush_local();
}
void smp_ptlb_all(void)
{
- on_each_cpu(smp_ptlb_callback, NULL, 0, 1);
+ on_each_cpu(smp_ptlb_callback, NULL, 0, 1);
}
EXPORT_SYMBOL(smp_ptlb_all);
#endif /* ! CONFIG_64BIT */
*/
void smp_send_reschedule(int cpu)
{
- smp_ext_bitcall(cpu, ec_schedule);
+ smp_ext_bitcall(cpu, ec_schedule);
}
/*
* parameter area for the set/clear control bit callbacks
*/
-typedef struct
-{
- __u16 start_ctl;
- __u16 end_ctl;
+struct ec_creg_mask_parms {
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;
+static void smp_ctl_bit_callback(void *info)
+{
+ struct ec_creg_mask_parms *pp = info;
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++)
+
+ __ctl_store(cregs, 0, 15);
+ for (i = 0; i <= 15; i++)
cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i];
- __ctl_load(cregs[pp->start_ctl], pp->start_ctl, pp->end_ctl);
+ __ctl_load(cregs, 0, 15);
}
/*
* Set a bit in a control register of all cpus
*/
-void smp_ctl_set_bit(int cr, int bit) {
- ec_creg_mask_parms parms;
+void smp_ctl_set_bit(int cr, int bit)
+{
+ struct ec_creg_mask_parms parms;
- parms.start_ctl = cr;
- parms.end_ctl = cr;
+ memset(&parms.orvals, 0, sizeof(parms.orvals));
+ memset(&parms.andvals, 0xff, sizeof(parms.andvals));
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();
+ on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1);
}
+EXPORT_SYMBOL(smp_ctl_set_bit);
/*
* Clear a bit in a control register of all cpus
*/
-void smp_ctl_clear_bit(int cr, int bit) {
- ec_creg_mask_parms parms;
+void smp_ctl_clear_bit(int cr, int bit)
+{
+ struct ec_creg_mask_parms parms;
- parms.start_ctl = cr;
- parms.end_ctl = cr;
- parms.orvals[cr] = 0;
+ memset(&parms.orvals, 0, sizeof(parms.orvals));
+ memset(&parms.andvals, 0xff, sizeof(parms.andvals));
parms.andvals[cr] = ~(1L << bit);
- preempt_disable();
- smp_call_function(smp_ctl_bit_callback, &parms, 0, 1);
- __ctl_clear_bit(cr, bit);
- preempt_enable();
+ on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1);
}
+EXPORT_SYMBOL(smp_ctl_clear_bit);
+
+/*
+ * In early ipl state a temp. logically cpu number is needed, so the sigp
+ * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on
+ * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1.
+ */
+#define CPU_INIT_NO 1
+
+#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
/*
- * Lets check how many CPUs we have.
+ * zfcpdump_prefix_array holds prefix registers for the following scenario:
+ * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to
+ * save its prefix registers, since they get lost, when switching from 31 bit
+ * to 64 bit.
*/
+unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \
+ __attribute__((__section__(".data")));
-static unsigned int
-__init smp_count_cpus(void)
+static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
{
- unsigned int cpu, num_cpus;
- __u16 boot_cpu_addr;
+ if (ipl_info.type != IPL_TYPE_FCP_DUMP)
+ return;
+ if (cpu >= NR_CPUS) {
+ printk(KERN_WARNING "Registers for cpu %i not saved since dump "
+ "kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS);
+ return;
+ }
+ zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL);
+ __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu;
+ while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) ==
+ sigp_busy)
+ cpu_relax();
+ memcpy(zfcpdump_save_areas[cpu],
+ (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
+ SAVE_AREA_SIZE);
+#ifdef CONFIG_64BIT
+ /* copy original prefix register */
+ zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu];
+#endif
+}
- /*
- * cpu 0 is the boot cpu. See smp_prepare_boot_cpu.
- */
+union save_area *zfcpdump_save_areas[NR_CPUS + 1];
+EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
- 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)
+#else
+
+static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { }
+
+#endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */
+
+static 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;
+}
+
+static int cpu_known(int cpu_id)
+{
+ int cpu;
+
+ for_each_present_cpu(cpu) {
+ if (__cpu_logical_map[cpu] == cpu_id)
+ return 1;
+ }
+ return 0;
+}
+
+static int smp_rescan_cpus_sigp(cpumask_t avail)
+{
+ int cpu_id, logical_cpu;
+
+ logical_cpu = first_cpu(avail);
+ if (logical_cpu == NR_CPUS)
+ return 0;
+ for (cpu_id = 0; cpu_id <= 65535; cpu_id++) {
+ if (cpu_known(cpu_id))
+ continue;
+ __cpu_logical_map[logical_cpu] = cpu_id;
+ if (!cpu_stopped(logical_cpu))
+ continue;
+ cpu_set(logical_cpu, cpu_present_map);
+ smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
+ logical_cpu = next_cpu(logical_cpu, avail);
+ if (logical_cpu == NR_CPUS)
+ break;
+ }
+ return 0;
+}
+
+static int smp_rescan_cpus_sclp(cpumask_t avail)
+{
+ struct sclp_cpu_info *info;
+ int cpu_id, logical_cpu, cpu;
+ int rc;
+
+ logical_cpu = first_cpu(avail);
+ if (logical_cpu == NR_CPUS)
+ return 0;
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ rc = sclp_get_cpu_info(info);
+ if (rc)
+ goto out;
+ for (cpu = 0; cpu < info->combined; cpu++) {
+ if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
continue;
- __cpu_logical_map[1] = (__u16) cpu;
- if (signal_processor(1, sigp_sense) ==
- sigp_not_operational)
+ cpu_id = info->cpu[cpu].address;
+ if (cpu_known(cpu_id))
continue;
- num_cpus++;
+ __cpu_logical_map[logical_cpu] = cpu_id;
+ cpu_set(logical_cpu, cpu_present_map);
+ if (cpu >= info->configured)
+ smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY;
+ else
+ smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
+ logical_cpu = next_cpu(logical_cpu, avail);
+ if (logical_cpu == NR_CPUS)
+ break;
}
+out:
+ kfree(info);
+ return rc;
+}
- printk("Detected %d CPU's\n",(int) num_cpus);
- printk("Boot cpu address %2X\n", boot_cpu_addr);
+static int smp_rescan_cpus(void)
+{
+ cpumask_t avail;
- return num_cpus;
+ cpus_xor(avail, cpu_possible_map, cpu_present_map);
+ if (smp_use_sigp_detection)
+ return smp_rescan_cpus_sigp(avail);
+ else
+ return smp_rescan_cpus_sclp(avail);
+}
+
+static void __init smp_detect_cpus(void)
+{
+ unsigned int cpu, c_cpus, s_cpus;
+ struct sclp_cpu_info *info;
+ u16 boot_cpu_addr, cpu_addr;
+
+ c_cpus = 1;
+ s_cpus = 0;
+ boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ panic("smp_detect_cpus failed to allocate memory\n");
+ /* Use sigp detection algorithm if sclp doesn't work. */
+ if (sclp_get_cpu_info(info)) {
+ smp_use_sigp_detection = 1;
+ for (cpu = 0; cpu <= 65535; cpu++) {
+ if (cpu == boot_cpu_addr)
+ continue;
+ __cpu_logical_map[CPU_INIT_NO] = cpu;
+ if (!cpu_stopped(CPU_INIT_NO))
+ continue;
+ smp_get_save_area(c_cpus, cpu);
+ c_cpus++;
+ }
+ goto out;
+ }
+
+ if (info->has_cpu_type) {
+ for (cpu = 0; cpu < info->combined; cpu++) {
+ if (info->cpu[cpu].address == boot_cpu_addr) {
+ smp_cpu_type = info->cpu[cpu].type;
+ break;
+ }
+ }
+ }
+
+ for (cpu = 0; cpu < info->combined; cpu++) {
+ if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
+ continue;
+ cpu_addr = info->cpu[cpu].address;
+ if (cpu_addr == boot_cpu_addr)
+ continue;
+ __cpu_logical_map[CPU_INIT_NO] = cpu_addr;
+ if (!cpu_stopped(CPU_INIT_NO)) {
+ s_cpus++;
+ continue;
+ }
+ smp_get_save_area(c_cpus, cpu_addr);
+ c_cpus++;
+ }
+out:
+ kfree(info);
+ printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus);
+ lock_cpu_hotplug();
+ smp_rescan_cpus();
+ unlock_cpu_hotplug();
}
/*
- * Activate a secondary processor.
+ * 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)
+int __cpuinit start_secondary(void *cpuvoid)
{
- /* Setup the cpu */
- cpu_init();
+ /* Setup the cpu */
+ cpu_init();
preempt_disable();
- /* init per CPU timer */
- init_cpu_timer();
+ /* Enable TOD clock interrupts on the secondary cpu. */
+ init_cpu_timer();
#ifdef CONFIG_VIRT_TIMER
- init_cpu_vtimer();
+ /* Enable cpu timer interrupts on the secondary cpu. */
+ init_cpu_vtimer();
#endif
-#ifdef CONFIG_PFAULT
/* Enable pfault pseudo page faults on this cpu. */
- if (MACHINE_IS_VM)
- pfault_init();
-#endif
+ pfault_init();
+
/* 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;
+ /* 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)
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;
+ spin_lock_init(&(&per_cpu(s390_idle, cpu))->lock);
}
/* Upping and downing of CPUs */
-
-int
-__cpu_up(unsigned int cpu)
+int __cpu_up(unsigned int cpu)
{
struct task_struct *idle;
- struct _lowcore *cpu_lowcore;
+ 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;
- }
+ sigp_ccode ccode;
- if (!cpu_stopped(cpu))
- return -ENODEV;
+ if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED)
+ return -EIO;
ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]),
cpu, sigp_set_prefix);
- if (ccode){
+ if (ccode) {
printk("sigp_set_prefix failed for cpu %d "
"with condition code %d\n",
(int) cpu, (int) ccode);
}
idle = current_set[cpu];
- cpu_lowcore = lowcore_ptr[cpu];
+ cpu_lowcore = lowcore_ptr[cpu];
cpu_lowcore->kernel_stack = (unsigned long)
- task_stack_page(idle) + (THREAD_SIZE);
+ task_stack_page(idle) + THREAD_SIZE;
sf = (struct stack_frame *) (cpu_lowcore->kernel_stack
- sizeof(struct pt_regs)
- 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");
+ 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;
+ cpu_lowcore->current_task = (unsigned long) idle;
+ cpu_lowcore->cpu_data.cpu_nr = cpu;
eieio();
- while (signal_processor(cpu,sigp_restart) == sigp_busy)
+ while (signal_processor(cpu, sigp_restart) == sigp_busy)
udelay(10);
while (!cpu_online(cpu))
return 0;
}
-static unsigned int __initdata additional_cpus;
-static unsigned int __initdata possible_cpus;
-
-void __init smp_setup_cpu_possible_map(void)
+static int __init setup_possible_cpus(char *s)
{
- 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);
+ int pcpus, cpu;
- for (cpu = 0; cpu < pos_cpus; cpu++)
+ pcpus = simple_strtoul(s, NULL, 0);
+ cpu_possible_map = cpumask_of_cpu(0);
+ for (cpu = 1; cpu < pcpus && cpu < NR_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)
+#ifdef CONFIG_HOTPLUG_CPU
+
+int __cpu_disable(void)
{
- unsigned long flags;
- ec_creg_mask_parms cr_parms;
+ struct ec_creg_mask_parms cr_parms;
int cpu = smp_processor_id();
- spin_lock_irqsave(&smp_reserve_lock, flags);
- if (smp_cpu_reserved[cpu] != 0) {
- spin_unlock_irqrestore(&smp_reserve_lock, flags);
- return -EBUSY;
- }
cpu_clear(cpu, cpu_online_map);
-#ifdef CONFIG_PFAULT
/* Disable pfault pseudo page faults on this cpu. */
- if (MACHINE_IS_VM)
- pfault_fini();
-#endif
+ pfault_fini();
- /* disable all external interrupts */
+ memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals));
+ memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals));
- cr_parms.start_ctl = 0;
- cr_parms.end_ctl = 0;
+ /* disable all external interrupts */
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);
-
+ cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 |
+ 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4);
/* 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);
-
+ cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
+ 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
/* 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);
+ 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)
+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);
+ printk(KERN_INFO "Processor %d spun down\n", cpu);
}
-void
-cpu_die(void)
+void cpu_die(void)
{
idle_task_exit();
signal_processor(smp_processor_id(), sigp_stop);
BUG();
- for(;;);
+ for (;;);
}
#endif /* CONFIG_HOTPLUG_CPU */
{
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
- */
+ int i;
+
+ smp_detect_cpus();
+
+ /* 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_cpu(i) {
+ 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)
+ __get_free_pages(GFP_KERNEL | GFP_DMA,
+ sizeof(void*) == 8 ? 1 : 0);
+ stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
+ if (!lowcore_ptr[i] || !stack)
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)
+ lowcore_ptr[i]->async_stack = stack + ASYNC_SIZE;
+ stack = __get_free_pages(GFP_KERNEL, 0);
+ if (!stack)
panic("smp_boot_cpus failed to allocate memory\n");
- lowcore_ptr[i]->panic_stack = stack + (PAGE_SIZE);
+ 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)
+ (__u32) __get_free_pages(GFP_KERNEL, 0);
+ if (!lowcore_ptr[i]->extended_save_area_addr)
panic("smp_boot_cpus failed to "
"allocate memory\n");
}
#endif
set_prefix((u32)(unsigned long) lowcore_ptr[smp_processor_id()]);
- for_each_cpu(cpu)
+ for_each_possible_cpu(cpu)
if (cpu != smp_processor_id())
smp_create_idle(cpu);
}
-void __devinit smp_prepare_boot_cpu(void)
+void __init smp_prepare_boot_cpu(void)
{
BUG_ON(smp_processor_id() != 0);
+ current_thread_info()->cpu = 0;
+ cpu_set(0, cpu_present_map);
cpu_set(0, cpu_online_map);
S390_lowcore.percpu_offset = __per_cpu_offset[0];
current_set[0] = current;
+ smp_cpu_state[0] = CPU_STATE_CONFIGURED;
+ spin_lock_init(&(&__get_cpu_var(s390_idle))->lock);
}
-void smp_cpus_done(unsigned int max_cpus)
+void __init smp_cpus_done(unsigned int max_cpus)
{
- cpu_present_map = cpu_possible_map;
}
/*
*/
int setup_profiling_timer(unsigned int multiplier)
{
- return 0;
+ return 0;
}
-static DEFINE_PER_CPU(struct cpu, cpu_devices);
+#ifdef CONFIG_HOTPLUG_CPU
+static ssize_t cpu_configure_show(struct sys_device *dev, char *buf)
+{
+ ssize_t count;
+
+ mutex_lock(&smp_cpu_state_mutex);
+ count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]);
+ mutex_unlock(&smp_cpu_state_mutex);
+ return count;
+}
+
+static ssize_t cpu_configure_store(struct sys_device *dev, const char *buf,
+ size_t count)
+{
+ int cpu = dev->id;
+ int val, rc;
+ char delim;
+
+ if (sscanf(buf, "%d %c", &val, &delim) != 1)
+ return -EINVAL;
+ if (val != 0 && val != 1)
+ return -EINVAL;
+
+ mutex_lock(&smp_cpu_state_mutex);
+ lock_cpu_hotplug();
+ rc = -EBUSY;
+ if (cpu_online(cpu))
+ goto out;
+ rc = 0;
+ switch (val) {
+ case 0:
+ if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) {
+ rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]);
+ if (!rc)
+ smp_cpu_state[cpu] = CPU_STATE_STANDBY;
+ }
+ break;
+ case 1:
+ if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) {
+ rc = sclp_cpu_configure(__cpu_logical_map[cpu]);
+ if (!rc)
+ smp_cpu_state[cpu] = CPU_STATE_CONFIGURED;
+ }
+ break;
+ default:
+ break;
+ }
+out:
+ unlock_cpu_hotplug();
+ mutex_unlock(&smp_cpu_state_mutex);
+ return rc ? rc : count;
+}
+static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
+#endif /* CONFIG_HOTPLUG_CPU */
+
+static ssize_t show_cpu_address(struct sys_device *dev, char *buf)
+{
+ return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]);
+}
+static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL);
+
+
+static struct attribute *cpu_common_attrs[] = {
+#ifdef CONFIG_HOTPLUG_CPU
+ &attr_configure.attr,
+#endif
+ &attr_address.attr,
+ NULL,
+};
+
+static struct attribute_group cpu_common_attr_group = {
+ .attrs = cpu_common_attrs,
+};
+
+static ssize_t show_capability(struct sys_device *dev, char *buf)
+{
+ unsigned int capability;
+ int rc;
+
+ rc = get_cpu_capability(&capability);
+ if (rc)
+ return rc;
+ return sprintf(buf, "%u\n", capability);
+}
+static SYSDEV_ATTR(capability, 0444, show_capability, NULL);
+
+static ssize_t show_idle_count(struct sys_device *dev, char *buf)
+{
+ struct s390_idle_data *idle;
+ unsigned long long idle_count;
+
+ idle = &per_cpu(s390_idle, dev->id);
+ spin_lock_irq(&idle->lock);
+ idle_count = idle->idle_count;
+ spin_unlock_irq(&idle->lock);
+ return sprintf(buf, "%llu\n", idle_count);
+}
+static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL);
+
+static ssize_t show_idle_time(struct sys_device *dev, char *buf)
+{
+ struct s390_idle_data *idle;
+ unsigned long long new_time;
+
+ idle = &per_cpu(s390_idle, dev->id);
+ spin_lock_irq(&idle->lock);
+ if (idle->in_idle) {
+ new_time = get_clock();
+ idle->idle_time += new_time - idle->idle_enter;
+ idle->idle_enter = new_time;
+ }
+ new_time = idle->idle_time;
+ spin_unlock_irq(&idle->lock);
+ return sprintf(buf, "%llu\n", new_time >> 12);
+}
+static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL);
+
+static struct attribute *cpu_online_attrs[] = {
+ &attr_capability.attr,
+ &attr_idle_count.attr,
+ &attr_idle_time_us.attr,
+ NULL,
+};
+
+static struct attribute_group cpu_online_attr_group = {
+ .attrs = cpu_online_attrs,
+};
+
+static int __cpuinit smp_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned int)(long)hcpu;
+ struct cpu *c = &per_cpu(cpu_devices, cpu);
+ struct sys_device *s = &c->sysdev;
+ struct s390_idle_data *idle;
+
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
+ idle = &per_cpu(s390_idle, cpu);
+ spin_lock_irq(&idle->lock);
+ idle->idle_enter = 0;
+ idle->idle_time = 0;
+ idle->idle_count = 0;
+ spin_unlock_irq(&idle->lock);
+ if (sysfs_create_group(&s->kobj, &cpu_online_attr_group))
+ return NOTIFY_BAD;
+ break;
+ case CPU_DEAD:
+ case CPU_DEAD_FROZEN:
+ sysfs_remove_group(&s->kobj, &cpu_online_attr_group);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata smp_cpu_nb = {
+ .notifier_call = smp_cpu_notify,
+};
+
+static int smp_add_present_cpu(int cpu)
+{
+ struct cpu *c = &per_cpu(cpu_devices, cpu);
+ struct sys_device *s = &c->sysdev;
+ int rc;
+
+ c->hotpluggable = 1;
+ rc = register_cpu(c, cpu);
+ if (rc)
+ goto out;
+ rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group);
+ if (rc)
+ goto out_cpu;
+ if (!cpu_online(cpu))
+ goto out;
+ rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group);
+ if (!rc)
+ return 0;
+ sysfs_remove_group(&s->kobj, &cpu_common_attr_group);
+out_cpu:
+#ifdef CONFIG_HOTPLUG_CPU
+ unregister_cpu(c);
+#endif
+out:
+ return rc;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static ssize_t rescan_store(struct sys_device *dev, const char *buf,
+ size_t count)
+{
+ cpumask_t newcpus;
+ int cpu;
+ int rc;
+
+ mutex_lock(&smp_cpu_state_mutex);
+ lock_cpu_hotplug();
+ newcpus = cpu_present_map;
+ rc = smp_rescan_cpus();
+ if (rc)
+ goto out;
+ cpus_andnot(newcpus, cpu_present_map, newcpus);
+ for_each_cpu_mask(cpu, newcpus) {
+ rc = smp_add_present_cpu(cpu);
+ if (rc)
+ cpu_clear(cpu, cpu_present_map);
+ }
+ rc = 0;
+out:
+ unlock_cpu_hotplug();
+ mutex_unlock(&smp_cpu_state_mutex);
+ return rc ? rc : count;
+}
+static SYSDEV_ATTR(rescan, 0200, NULL, rescan_store);
+#endif /* CONFIG_HOTPLUG_CPU */
static int __init topology_init(void)
{
int cpu;
- int ret;
+ int rc;
+
+ register_cpu_notifier(&smp_cpu_nb);
- for_each_cpu(cpu) {
- ret = register_cpu(&per_cpu(cpu_devices, cpu), cpu, NULL);
- if (ret)
- printk(KERN_WARNING "topology_init: register_cpu %d "
- "failed (%d)\n", cpu, ret);
+#ifdef CONFIG_HOTPLUG_CPU
+ rc = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
+ &attr_rescan.attr);
+ if (rc)
+ return rc;
+#endif
+ for_each_present_cpu(cpu) {
+ rc = smp_add_present_cpu(cpu);
+ if (rc)
+ return rc;
}
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);
-
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff