![KAMEZAWA Hiroyuki](/assets/img/avatar_default.png)
for_each_cpu() actually iterates across all possible CPUs. We've had mistakes in the past where people were using for_each_cpu() where they should have been iterating across only online or present CPUs. This is inefficient and possibly buggy. We're renaming for_each_cpu() to for_each_possible_cpu() to avoid this in the future. This patch replaces for_each_cpu with for_each_possible_cpu. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
891 lines
21 KiB
C
891 lines
21 KiB
C
/*
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* arch/s390/kernel/smp.c
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*
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* Copyright (C) IBM Corp. 1999,2006
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Heiko Carstens (heiko.carstens@de.ibm.com)
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*
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* based on other smp stuff by
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* (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net>
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* (c) 1998 Ingo Molnar
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*
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* We work with logical cpu numbering everywhere we can. The only
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* functions using the real cpu address (got from STAP) are the sigp
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* functions. For all other functions we use the identity mapping.
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* That means that cpu_number_map[i] == i for every cpu. cpu_number_map is
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* used e.g. to find the idle task belonging to a logical cpu. Every array
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* in the kernel is sorted by the logical cpu number and not by the physical
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* one which is causing all the confusion with __cpu_logical_map and
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* cpu_number_map in other architectures.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/spinlock.h>
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#include <linux/kernel_stat.h>
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#include <linux/smp_lock.h>
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#include <linux/delay.h>
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#include <linux/cache.h>
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#include <linux/interrupt.h>
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#include <linux/cpu.h>
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#include <asm/sigp.h>
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#include <asm/pgalloc.h>
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#include <asm/irq.h>
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#include <asm/s390_ext.h>
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#include <asm/cpcmd.h>
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#include <asm/tlbflush.h>
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extern volatile int __cpu_logical_map[];
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/*
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* An array with a pointer the lowcore of every CPU.
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*/
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struct _lowcore *lowcore_ptr[NR_CPUS];
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cpumask_t cpu_online_map = CPU_MASK_NONE;
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cpumask_t cpu_possible_map = CPU_MASK_NONE;
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static struct task_struct *current_set[NR_CPUS];
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/*
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* Reboot, halt and power_off routines for SMP.
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*/
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extern char vmhalt_cmd[];
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extern char vmpoff_cmd[];
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extern void reipl(unsigned long devno);
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extern void reipl_diag(void);
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static void smp_ext_bitcall(int, ec_bit_sig);
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static void smp_ext_bitcall_others(ec_bit_sig);
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/*
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* Structure and data for smp_call_function(). This is designed to minimise
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* static memory requirements. It also looks cleaner.
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*/
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static DEFINE_SPINLOCK(call_lock);
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struct call_data_struct {
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void (*func) (void *info);
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void *info;
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atomic_t started;
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atomic_t finished;
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int wait;
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};
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static struct call_data_struct * call_data;
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/*
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* 'Call function' interrupt callback
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*/
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static void do_call_function(void)
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{
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void (*func) (void *info) = call_data->func;
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void *info = call_data->info;
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int wait = call_data->wait;
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atomic_inc(&call_data->started);
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(*func)(info);
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if (wait)
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atomic_inc(&call_data->finished);
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}
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/*
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* this function sends a 'generic call function' IPI to all other CPUs
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* in the system.
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*/
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int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
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int wait)
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/*
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* [SUMMARY] Run a function on all other CPUs.
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* <func> The function to run. This must be fast and non-blocking.
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* <info> An arbitrary pointer to pass to the function.
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* <nonatomic> currently unused.
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* <wait> If true, wait (atomically) until function has completed on other CPUs.
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* [RETURNS] 0 on success, else a negative status code. Does not return until
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* remote CPUs are nearly ready to execute <<func>> or are or have executed.
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*
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* You must not call this function with disabled interrupts or from a
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* hardware interrupt handler or from a bottom half handler.
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*/
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{
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struct call_data_struct data;
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int cpus = num_online_cpus()-1;
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if (cpus <= 0)
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return 0;
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/* Can deadlock when called with interrupts disabled */
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WARN_ON(irqs_disabled());
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data.func = func;
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data.info = info;
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atomic_set(&data.started, 0);
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data.wait = wait;
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if (wait)
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atomic_set(&data.finished, 0);
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spin_lock(&call_lock);
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call_data = &data;
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/* Send a message to all other CPUs and wait for them to respond */
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smp_ext_bitcall_others(ec_call_function);
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/* Wait for response */
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while (atomic_read(&data.started) != cpus)
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cpu_relax();
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if (wait)
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while (atomic_read(&data.finished) != cpus)
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cpu_relax();
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spin_unlock(&call_lock);
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return 0;
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}
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/*
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* Call a function on one CPU
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* cpu : the CPU the function should be executed on
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*
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* You must not call this function with disabled interrupts or from a
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* hardware interrupt handler. You may call it from a bottom half.
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*
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* It is guaranteed that the called function runs on the specified CPU,
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* preemption is disabled.
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*/
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int smp_call_function_on(void (*func) (void *info), void *info,
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int nonatomic, int wait, int cpu)
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{
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struct call_data_struct data;
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int curr_cpu;
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if (!cpu_online(cpu))
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return -EINVAL;
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/* disable preemption for local function call */
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curr_cpu = get_cpu();
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if (curr_cpu == cpu) {
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/* direct call to function */
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func(info);
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put_cpu();
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return 0;
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}
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data.func = func;
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data.info = info;
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atomic_set(&data.started, 0);
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data.wait = wait;
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if (wait)
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atomic_set(&data.finished, 0);
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spin_lock_bh(&call_lock);
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call_data = &data;
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smp_ext_bitcall(cpu, ec_call_function);
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/* Wait for response */
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while (atomic_read(&data.started) != 1)
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cpu_relax();
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if (wait)
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while (atomic_read(&data.finished) != 1)
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cpu_relax();
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spin_unlock_bh(&call_lock);
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put_cpu();
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return 0;
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}
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EXPORT_SYMBOL(smp_call_function_on);
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static inline void do_send_stop(void)
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{
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int cpu, rc;
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/* stop all processors */
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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do {
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rc = signal_processor(cpu, sigp_stop);
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} while (rc == sigp_busy);
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}
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}
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static inline void do_store_status(void)
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{
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int cpu, rc;
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/* store status of all processors in their lowcores (real 0) */
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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do {
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rc = signal_processor_p(
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(__u32)(unsigned long) lowcore_ptr[cpu], cpu,
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sigp_store_status_at_address);
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} while(rc == sigp_busy);
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}
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}
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/*
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* this function sends a 'stop' sigp to all other CPUs in the system.
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* it goes straight through.
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*/
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void smp_send_stop(void)
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{
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/* write magic number to zero page (absolute 0) */
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lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC;
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/* stop other processors. */
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do_send_stop();
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/* store status of other processors. */
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do_store_status();
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}
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/*
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* Reboot, halt and power_off routines for SMP.
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*/
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static void do_machine_restart(void * __unused)
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{
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int cpu;
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static atomic_t cpuid = ATOMIC_INIT(-1);
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if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1)
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signal_processor(smp_processor_id(), sigp_stop);
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/* Wait for all other cpus to enter stopped state */
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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while(!smp_cpu_not_running(cpu))
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cpu_relax();
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}
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/* Store status of other cpus. */
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do_store_status();
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/*
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* Finally call reipl. Because we waited for all other
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* cpus to enter this function we know that they do
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* not hold any s390irq-locks (the cpus have been
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* interrupted by an external interrupt and s390irq
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* locks are always held disabled).
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*/
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reipl_diag();
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if (MACHINE_IS_VM)
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cpcmd ("IPL", NULL, 0, NULL);
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else
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reipl (0x10000 | S390_lowcore.ipl_device);
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}
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void machine_restart_smp(char * __unused)
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{
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on_each_cpu(do_machine_restart, NULL, 0, 0);
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}
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static void do_wait_for_stop(void)
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{
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unsigned long cr[16];
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__ctl_store(cr, 0, 15);
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cr[0] &= ~0xffff;
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cr[6] = 0;
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__ctl_load(cr, 0, 15);
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for (;;)
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enabled_wait();
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}
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static void do_machine_halt(void * __unused)
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{
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static atomic_t cpuid = ATOMIC_INIT(-1);
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if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) {
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smp_send_stop();
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if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
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cpcmd(vmhalt_cmd, NULL, 0, NULL);
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signal_processor(smp_processor_id(),
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sigp_stop_and_store_status);
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}
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do_wait_for_stop();
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}
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void machine_halt_smp(void)
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{
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on_each_cpu(do_machine_halt, NULL, 0, 0);
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}
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static void do_machine_power_off(void * __unused)
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{
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static atomic_t cpuid = ATOMIC_INIT(-1);
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if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) {
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smp_send_stop();
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if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
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cpcmd(vmpoff_cmd, NULL, 0, NULL);
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signal_processor(smp_processor_id(),
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sigp_stop_and_store_status);
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}
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do_wait_for_stop();
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}
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void machine_power_off_smp(void)
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{
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on_each_cpu(do_machine_power_off, NULL, 0, 0);
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}
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/*
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* This is the main routine where commands issued by other
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* cpus are handled.
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*/
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void do_ext_call_interrupt(struct pt_regs *regs, __u16 code)
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{
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unsigned long bits;
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/*
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* handle bit signal external calls
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*
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* For the ec_schedule signal we have to do nothing. All the work
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* is done automatically when we return from the interrupt.
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*/
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bits = xchg(&S390_lowcore.ext_call_fast, 0);
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if (test_bit(ec_call_function, &bits))
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do_call_function();
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}
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/*
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* Send an external call sigp to another cpu and return without waiting
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* for its completion.
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*/
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static void smp_ext_bitcall(int cpu, ec_bit_sig sig)
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{
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/*
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* Set signaling bit in lowcore of target cpu and kick it
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*/
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set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
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while(signal_processor(cpu, sigp_emergency_signal) == sigp_busy)
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udelay(10);
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}
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/*
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* Send an external call sigp to every other cpu in the system and
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* return without waiting for its completion.
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*/
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static void smp_ext_bitcall_others(ec_bit_sig sig)
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{
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int cpu;
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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/*
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* Set signaling bit in lowcore of target cpu and kick it
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*/
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set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
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while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy)
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udelay(10);
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}
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}
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#ifndef CONFIG_64BIT
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/*
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* this function sends a 'purge tlb' signal to another CPU.
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*/
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void smp_ptlb_callback(void *info)
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{
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local_flush_tlb();
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}
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void smp_ptlb_all(void)
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{
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on_each_cpu(smp_ptlb_callback, NULL, 0, 1);
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}
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EXPORT_SYMBOL(smp_ptlb_all);
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#endif /* ! CONFIG_64BIT */
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/*
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* this function sends a 'reschedule' IPI to another CPU.
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* it goes straight through and wastes no time serializing
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* anything. Worst case is that we lose a reschedule ...
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*/
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void smp_send_reschedule(int cpu)
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{
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smp_ext_bitcall(cpu, ec_schedule);
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}
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/*
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* parameter area for the set/clear control bit callbacks
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*/
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typedef struct
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{
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__u16 start_ctl;
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__u16 end_ctl;
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unsigned long orvals[16];
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unsigned long andvals[16];
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} ec_creg_mask_parms;
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/*
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* callback for setting/clearing control bits
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*/
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void smp_ctl_bit_callback(void *info) {
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ec_creg_mask_parms *pp;
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unsigned long cregs[16];
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int i;
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pp = (ec_creg_mask_parms *) info;
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__ctl_store(cregs[pp->start_ctl], pp->start_ctl, pp->end_ctl);
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for (i = pp->start_ctl; i <= pp->end_ctl; i++)
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cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i];
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__ctl_load(cregs[pp->start_ctl], pp->start_ctl, pp->end_ctl);
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}
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/*
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* Set a bit in a control register of all cpus
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*/
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void smp_ctl_set_bit(int cr, int bit) {
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ec_creg_mask_parms parms;
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parms.start_ctl = cr;
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parms.end_ctl = cr;
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parms.orvals[cr] = 1 << bit;
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parms.andvals[cr] = -1L;
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preempt_disable();
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smp_call_function(smp_ctl_bit_callback, &parms, 0, 1);
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__ctl_set_bit(cr, bit);
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preempt_enable();
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}
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/*
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* Clear a bit in a control register of all cpus
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*/
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void smp_ctl_clear_bit(int cr, int bit) {
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ec_creg_mask_parms parms;
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parms.start_ctl = cr;
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parms.end_ctl = cr;
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parms.orvals[cr] = 0;
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parms.andvals[cr] = ~(1L << bit);
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preempt_disable();
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smp_call_function(smp_ctl_bit_callback, &parms, 0, 1);
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__ctl_clear_bit(cr, bit);
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preempt_enable();
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}
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/*
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* Lets check how many CPUs we have.
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*/
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static unsigned int
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__init smp_count_cpus(void)
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{
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unsigned int cpu, num_cpus;
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__u16 boot_cpu_addr;
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/*
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* cpu 0 is the boot cpu. See smp_prepare_boot_cpu.
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*/
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boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;
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current_thread_info()->cpu = 0;
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num_cpus = 1;
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for (cpu = 0; cpu <= 65535; cpu++) {
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if ((__u16) cpu == boot_cpu_addr)
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continue;
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__cpu_logical_map[1] = (__u16) cpu;
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if (signal_processor(1, sigp_sense) ==
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sigp_not_operational)
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continue;
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num_cpus++;
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}
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printk("Detected %d CPU's\n",(int) num_cpus);
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printk("Boot cpu address %2X\n", boot_cpu_addr);
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return num_cpus;
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}
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/*
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* Activate a secondary processor.
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*/
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extern void init_cpu_timer(void);
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extern void init_cpu_vtimer(void);
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extern int pfault_init(void);
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extern void pfault_fini(void);
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int __devinit start_secondary(void *cpuvoid)
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{
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/* Setup the cpu */
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cpu_init();
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preempt_disable();
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/* init per CPU timer */
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init_cpu_timer();
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#ifdef CONFIG_VIRT_TIMER
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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;
|
|
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
|
|
|
|
/* 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) {
|
|
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);
|
|
}
|
|
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);
|
|
|