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2a3a2d66aa
We use both the external call and emergency call IPIs to signal remote cpus. Therefore it makes sense to account them differently withing /proc/irqstats so we actually know what happened. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1177 lines
28 KiB
C
1177 lines
28 KiB
C
/*
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* arch/s390/kernel/smp.c
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*
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* Copyright IBM Corp. 1999, 2009
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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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#define KMSG_COMPONENT "cpu"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/workqueue.h>
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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/err.h>
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#include <linux/spinlock.h>
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#include <linux/kernel_stat.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/irqflags.h>
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#include <linux/cpu.h>
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#include <linux/timex.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <linux/crash_dump.h>
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#include <asm/asm-offsets.h>
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#include <asm/ipl.h>
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#include <asm/setup.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/cpcmd.h>
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#include <asm/tlbflush.h>
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#include <asm/timer.h>
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#include <asm/lowcore.h>
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#include <asm/sclp.h>
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#include <asm/cputime.h>
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#include <asm/vdso.h>
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#include <asm/cpu.h>
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#include "entry.h"
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/* logical cpu to cpu address */
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unsigned short __cpu_logical_map[NR_CPUS];
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static struct task_struct *current_set[NR_CPUS];
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static u8 smp_cpu_type;
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static int smp_use_sigp_detection;
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enum s390_cpu_state {
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CPU_STATE_STANDBY,
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CPU_STATE_CONFIGURED,
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};
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DEFINE_MUTEX(smp_cpu_state_mutex);
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int smp_cpu_polarization[NR_CPUS];
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static int smp_cpu_state[NR_CPUS];
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static int cpu_management;
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static DEFINE_PER_CPU(struct cpu, cpu_devices);
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static void smp_ext_bitcall(int, int);
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static int raw_cpu_stopped(int cpu)
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{
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u32 status;
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switch (raw_sigp_ps(&status, 0, cpu, sigp_sense)) {
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case sigp_status_stored:
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/* Check for stopped and check stop state */
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if (status & 0x50)
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return 1;
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break;
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default:
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break;
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}
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return 0;
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}
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static inline int cpu_stopped(int cpu)
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{
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return raw_cpu_stopped(cpu_logical_map(cpu));
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}
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/*
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* Ensure that PSW restart is done on an online CPU
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*/
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void smp_restart_with_online_cpu(void)
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{
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int cpu;
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for_each_online_cpu(cpu) {
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if (stap() == __cpu_logical_map[cpu]) {
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/* We are online: Enable DAT again and return */
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__load_psw_mask(psw_kernel_bits | PSW_MASK_DAT);
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return;
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}
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}
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/* We are not online: Do PSW restart on an online CPU */
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while (sigp(cpu, sigp_restart) == sigp_busy)
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cpu_relax();
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/* And stop ourself */
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while (raw_sigp(stap(), sigp_stop) == sigp_busy)
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cpu_relax();
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for (;;);
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}
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void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
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{
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struct _lowcore *lc, *current_lc;
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struct stack_frame *sf;
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struct pt_regs *regs;
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unsigned long sp;
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if (smp_processor_id() == 0)
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func(data);
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__load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE |
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PSW_MASK_EA | PSW_MASK_BA);
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/* Disable lowcore protection */
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__ctl_clear_bit(0, 28);
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current_lc = lowcore_ptr[smp_processor_id()];
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lc = lowcore_ptr[0];
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if (!lc)
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lc = current_lc;
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lc->restart_psw.mask =
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PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
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lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu;
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if (!cpu_online(0))
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smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]);
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while (sigp(0, sigp_stop_and_store_status) == sigp_busy)
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cpu_relax();
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sp = lc->panic_stack;
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sp -= sizeof(struct pt_regs);
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regs = (struct pt_regs *) sp;
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memcpy(®s->gprs, ¤t_lc->gpregs_save_area, sizeof(regs->gprs));
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regs->psw = lc->psw_save_area;
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sp -= STACK_FRAME_OVERHEAD;
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sf = (struct stack_frame *) sp;
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sf->back_chain = regs->gprs[15];
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smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]);
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}
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void smp_send_stop(void)
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{
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int cpu, rc;
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/* Disable all interrupts/machine checks */
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__load_psw_mask(psw_kernel_bits | PSW_MASK_DAT);
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trace_hardirqs_off();
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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 = sigp(cpu, sigp_stop);
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} while (rc == sigp_busy);
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while (!cpu_stopped(cpu))
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cpu_relax();
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}
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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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static void do_ext_call_interrupt(unsigned int ext_int_code,
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unsigned int param32, unsigned long param64)
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{
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unsigned long bits;
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if (ext_int_code == 0x1202)
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kstat_cpu(smp_processor_id()).irqs[EXTINT_EXC]++;
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else
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kstat_cpu(smp_processor_id()).irqs[EXTINT_EMS]++;
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/*
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* handle bit signal external calls
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*/
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bits = xchg(&S390_lowcore.ext_call_fast, 0);
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if (test_bit(ec_schedule, &bits))
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scheduler_ipi();
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if (test_bit(ec_call_function, &bits))
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generic_smp_call_function_interrupt();
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if (test_bit(ec_call_function_single, &bits))
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generic_smp_call_function_single_interrupt();
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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, int sig)
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{
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int order;
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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 (1) {
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order = smp_vcpu_scheduled(cpu) ?
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sigp_external_call : sigp_emergency_signal;
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if (sigp(cpu, order) != sigp_busy)
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break;
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udelay(10);
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}
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}
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void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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{
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int cpu;
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for_each_cpu(cpu, mask)
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smp_ext_bitcall(cpu, ec_call_function);
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}
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void arch_send_call_function_single_ipi(int cpu)
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{
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smp_ext_bitcall(cpu, ec_call_function_single);
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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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static void smp_ptlb_callback(void *info)
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{
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__tlb_flush_local();
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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, 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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struct ec_creg_mask_parms {
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unsigned long orvals[16];
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unsigned long andvals[16];
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};
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/*
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* callback for setting/clearing control bits
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*/
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static void smp_ctl_bit_callback(void *info)
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{
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struct ec_creg_mask_parms *pp = info;
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unsigned long cregs[16];
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int i;
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__ctl_store(cregs, 0, 15);
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for (i = 0; i <= 15; i++)
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cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i];
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__ctl_load(cregs, 0, 15);
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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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{
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struct ec_creg_mask_parms parms;
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memset(&parms.orvals, 0, sizeof(parms.orvals));
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memset(&parms.andvals, 0xff, sizeof(parms.andvals));
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parms.orvals[cr] = 1UL << bit;
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on_each_cpu(smp_ctl_bit_callback, &parms, 1);
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}
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EXPORT_SYMBOL(smp_ctl_set_bit);
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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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{
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struct ec_creg_mask_parms parms;
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memset(&parms.orvals, 0, sizeof(parms.orvals));
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memset(&parms.andvals, 0xff, sizeof(parms.andvals));
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parms.andvals[cr] = ~(1UL << bit);
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on_each_cpu(smp_ctl_bit_callback, &parms, 1);
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}
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EXPORT_SYMBOL(smp_ctl_clear_bit);
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#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP)
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static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
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{
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if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE)
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return;
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if (is_kdump_kernel())
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return;
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if (cpu >= NR_CPUS) {
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pr_warning("CPU %i exceeds the maximum %i and is excluded from "
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"the dump\n", cpu, NR_CPUS - 1);
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return;
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}
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zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL);
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while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy)
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cpu_relax();
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memcpy_real(zfcpdump_save_areas[cpu],
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(void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
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sizeof(struct save_area));
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}
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struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
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EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
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#else
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static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { }
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#endif /* CONFIG_ZFCPDUMP */
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static int cpu_known(int cpu_id)
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{
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int cpu;
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for_each_present_cpu(cpu) {
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if (__cpu_logical_map[cpu] == cpu_id)
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return 1;
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}
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return 0;
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}
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static int smp_rescan_cpus_sigp(cpumask_t avail)
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{
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int cpu_id, logical_cpu;
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logical_cpu = cpumask_first(&avail);
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if (logical_cpu >= nr_cpu_ids)
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return 0;
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for (cpu_id = 0; cpu_id <= MAX_CPU_ADDRESS; cpu_id++) {
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if (cpu_known(cpu_id))
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continue;
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__cpu_logical_map[logical_cpu] = cpu_id;
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smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
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if (!cpu_stopped(logical_cpu))
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continue;
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set_cpu_present(logical_cpu, true);
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smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
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logical_cpu = cpumask_next(logical_cpu, &avail);
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if (logical_cpu >= nr_cpu_ids)
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break;
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}
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return 0;
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}
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static int smp_rescan_cpus_sclp(cpumask_t avail)
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{
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struct sclp_cpu_info *info;
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int cpu_id, logical_cpu, cpu;
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int rc;
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logical_cpu = cpumask_first(&avail);
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if (logical_cpu >= nr_cpu_ids)
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return 0;
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info = kmalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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rc = sclp_get_cpu_info(info);
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if (rc)
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goto out;
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for (cpu = 0; cpu < info->combined; cpu++) {
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if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
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continue;
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cpu_id = info->cpu[cpu].address;
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if (cpu_known(cpu_id))
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continue;
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__cpu_logical_map[logical_cpu] = cpu_id;
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smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN;
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set_cpu_present(logical_cpu, true);
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if (cpu >= info->configured)
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smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY;
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else
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smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED;
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logical_cpu = cpumask_next(logical_cpu, &avail);
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if (logical_cpu >= nr_cpu_ids)
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break;
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}
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out:
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kfree(info);
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return rc;
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}
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static int __smp_rescan_cpus(void)
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{
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cpumask_t avail;
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cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask);
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if (smp_use_sigp_detection)
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return smp_rescan_cpus_sigp(avail);
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else
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return smp_rescan_cpus_sclp(avail);
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}
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static void __init smp_detect_cpus(void)
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{
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unsigned int cpu, c_cpus, s_cpus;
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struct sclp_cpu_info *info;
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u16 boot_cpu_addr, cpu_addr;
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c_cpus = 1;
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s_cpus = 0;
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boot_cpu_addr = __cpu_logical_map[0];
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info = kmalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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panic("smp_detect_cpus failed to allocate memory\n");
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#ifdef CONFIG_CRASH_DUMP
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if (OLDMEM_BASE && !is_kdump_kernel()) {
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struct save_area *save_area;
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save_area = kmalloc(sizeof(*save_area), GFP_KERNEL);
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if (!save_area)
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panic("could not allocate memory for save area\n");
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copy_oldmem_page(1, (void *) save_area, sizeof(*save_area),
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0x200, 0);
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zfcpdump_save_areas[0] = save_area;
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}
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#endif
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/* Use sigp detection algorithm if sclp doesn't work. */
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if (sclp_get_cpu_info(info)) {
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smp_use_sigp_detection = 1;
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for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) {
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if (cpu == boot_cpu_addr)
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continue;
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if (!raw_cpu_stopped(cpu))
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continue;
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smp_get_save_area(c_cpus, cpu);
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c_cpus++;
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}
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goto out;
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}
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if (info->has_cpu_type) {
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for (cpu = 0; cpu < info->combined; cpu++) {
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if (info->cpu[cpu].address == boot_cpu_addr) {
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smp_cpu_type = info->cpu[cpu].type;
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break;
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}
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}
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}
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for (cpu = 0; cpu < info->combined; cpu++) {
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if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type)
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continue;
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cpu_addr = info->cpu[cpu].address;
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if (cpu_addr == boot_cpu_addr)
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continue;
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if (!raw_cpu_stopped(cpu_addr)) {
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s_cpus++;
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continue;
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}
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smp_get_save_area(c_cpus, cpu_addr);
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c_cpus++;
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}
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out:
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kfree(info);
|
|
pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus);
|
|
get_online_cpus();
|
|
__smp_rescan_cpus();
|
|
put_online_cpus();
|
|
}
|
|
|
|
/*
|
|
* Activate a secondary processor.
|
|
*/
|
|
int __cpuinit start_secondary(void *cpuvoid)
|
|
{
|
|
cpu_init();
|
|
preempt_disable();
|
|
init_cpu_timer();
|
|
init_cpu_vtimer();
|
|
pfault_init();
|
|
|
|
notify_cpu_starting(smp_processor_id());
|
|
ipi_call_lock();
|
|
set_cpu_online(smp_processor_id(), true);
|
|
ipi_call_unlock();
|
|
__ctl_clear_bit(0, 28); /* Disable lowcore protection */
|
|
S390_lowcore.restart_psw.mask =
|
|
PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
|
|
S390_lowcore.restart_psw.addr =
|
|
PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
|
|
__ctl_set_bit(0, 28); /* Enable lowcore protection */
|
|
/*
|
|
* Wait until the cpu which brought this one up marked it
|
|
* active before enabling interrupts.
|
|
*/
|
|
while (!cpumask_test_cpu(smp_processor_id(), cpu_active_mask))
|
|
cpu_relax();
|
|
local_irq_enable();
|
|
/* cpu_idle will call schedule for us */
|
|
cpu_idle();
|
|
return 0;
|
|
}
|
|
|
|
struct create_idle {
|
|
struct work_struct work;
|
|
struct task_struct *idle;
|
|
struct completion done;
|
|
int cpu;
|
|
};
|
|
|
|
static void __cpuinit smp_fork_idle(struct work_struct *work)
|
|
{
|
|
struct create_idle *c_idle;
|
|
|
|
c_idle = container_of(work, struct create_idle, work);
|
|
c_idle->idle = fork_idle(c_idle->cpu);
|
|
complete(&c_idle->done);
|
|
}
|
|
|
|
static int __cpuinit smp_alloc_lowcore(int cpu)
|
|
{
|
|
unsigned long async_stack, panic_stack;
|
|
struct _lowcore *lowcore;
|
|
|
|
lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
|
|
if (!lowcore)
|
|
return -ENOMEM;
|
|
async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
|
|
panic_stack = __get_free_page(GFP_KERNEL);
|
|
if (!panic_stack || !async_stack)
|
|
goto out;
|
|
memcpy(lowcore, &S390_lowcore, 512);
|
|
memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
|
|
lowcore->async_stack = async_stack + ASYNC_SIZE;
|
|
lowcore->panic_stack = panic_stack + PAGE_SIZE;
|
|
lowcore->restart_psw.mask =
|
|
PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA;
|
|
lowcore->restart_psw.addr =
|
|
PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
|
|
if (user_mode != HOME_SPACE_MODE)
|
|
lowcore->restart_psw.mask |= PSW_ASC_HOME;
|
|
#ifndef CONFIG_64BIT
|
|
if (MACHINE_HAS_IEEE) {
|
|
unsigned long save_area;
|
|
|
|
save_area = get_zeroed_page(GFP_KERNEL);
|
|
if (!save_area)
|
|
goto out;
|
|
lowcore->extended_save_area_addr = (u32) save_area;
|
|
}
|
|
#else
|
|
if (vdso_alloc_per_cpu(cpu, lowcore))
|
|
goto out;
|
|
#endif
|
|
lowcore_ptr[cpu] = lowcore;
|
|
return 0;
|
|
|
|
out:
|
|
free_page(panic_stack);
|
|
free_pages(async_stack, ASYNC_ORDER);
|
|
free_pages((unsigned long) lowcore, LC_ORDER);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void smp_free_lowcore(int cpu)
|
|
{
|
|
struct _lowcore *lowcore;
|
|
|
|
lowcore = lowcore_ptr[cpu];
|
|
#ifndef CONFIG_64BIT
|
|
if (MACHINE_HAS_IEEE)
|
|
free_page((unsigned long) lowcore->extended_save_area_addr);
|
|
#else
|
|
vdso_free_per_cpu(cpu, lowcore);
|
|
#endif
|
|
free_page(lowcore->panic_stack - PAGE_SIZE);
|
|
free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER);
|
|
free_pages((unsigned long) lowcore, LC_ORDER);
|
|
lowcore_ptr[cpu] = NULL;
|
|
}
|
|
|
|
/* Upping and downing of CPUs */
|
|
int __cpuinit __cpu_up(unsigned int cpu)
|
|
{
|
|
struct _lowcore *cpu_lowcore;
|
|
struct create_idle c_idle;
|
|
struct task_struct *idle;
|
|
struct stack_frame *sf;
|
|
u32 lowcore;
|
|
int ccode;
|
|
|
|
if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED)
|
|
return -EIO;
|
|
idle = current_set[cpu];
|
|
if (!idle) {
|
|
c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done);
|
|
INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle);
|
|
c_idle.cpu = cpu;
|
|
schedule_work(&c_idle.work);
|
|
wait_for_completion(&c_idle.done);
|
|
if (IS_ERR(c_idle.idle))
|
|
return PTR_ERR(c_idle.idle);
|
|
idle = c_idle.idle;
|
|
current_set[cpu] = c_idle.idle;
|
|
}
|
|
init_idle(idle, cpu);
|
|
if (smp_alloc_lowcore(cpu))
|
|
return -ENOMEM;
|
|
do {
|
|
ccode = sigp(cpu, sigp_initial_cpu_reset);
|
|
if (ccode == sigp_busy)
|
|
udelay(10);
|
|
if (ccode == sigp_not_operational)
|
|
goto err_out;
|
|
} while (ccode == sigp_busy);
|
|
|
|
lowcore = (u32)(unsigned long)lowcore_ptr[cpu];
|
|
while (sigp_p(lowcore, cpu, sigp_set_prefix) == sigp_busy)
|
|
udelay(10);
|
|
|
|
cpu_lowcore = lowcore_ptr[cpu];
|
|
cpu_lowcore->kernel_stack = (unsigned long)
|
|
task_stack_page(idle) + THREAD_SIZE;
|
|
cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle);
|
|
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, 15);
|
|
atomic_inc(&init_mm.context.attach_count);
|
|
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_nr = cpu;
|
|
cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce;
|
|
cpu_lowcore->machine_flags = S390_lowcore.machine_flags;
|
|
cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func;
|
|
memcpy(cpu_lowcore->stfle_fac_list, S390_lowcore.stfle_fac_list,
|
|
MAX_FACILITY_BIT/8);
|
|
eieio();
|
|
|
|
while (sigp(cpu, sigp_restart) == sigp_busy)
|
|
udelay(10);
|
|
|
|
while (!cpu_online(cpu))
|
|
cpu_relax();
|
|
return 0;
|
|
|
|
err_out:
|
|
smp_free_lowcore(cpu);
|
|
return -EIO;
|
|
}
|
|
|
|
static int __init setup_possible_cpus(char *s)
|
|
{
|
|
int pcpus, cpu;
|
|
|
|
pcpus = simple_strtoul(s, NULL, 0);
|
|
init_cpu_possible(cpumask_of(0));
|
|
for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++)
|
|
set_cpu_possible(cpu, true);
|
|
return 0;
|
|
}
|
|
early_param("possible_cpus", setup_possible_cpus);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
int __cpu_disable(void)
|
|
{
|
|
struct ec_creg_mask_parms cr_parms;
|
|
int cpu = smp_processor_id();
|
|
|
|
set_cpu_online(cpu, false);
|
|
|
|
/* Disable pfault pseudo page faults on this cpu. */
|
|
pfault_fini();
|
|
|
|
memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals));
|
|
memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals));
|
|
|
|
/* disable all external interrupts */
|
|
cr_parms.orvals[0] = 0;
|
|
cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 11 |
|
|
1 << 10 | 1 << 9 | 1 << 6 | 1 << 5 |
|
|
1 << 4);
|
|
/* disable all I/O interrupts */
|
|
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);
|
|
/* disable most machine checks */
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __cpu_die(unsigned int cpu)
|
|
{
|
|
/* Wait until target cpu is down */
|
|
while (!cpu_stopped(cpu))
|
|
cpu_relax();
|
|
while (sigp_p(0, cpu, sigp_set_prefix) == sigp_busy)
|
|
udelay(10);
|
|
smp_free_lowcore(cpu);
|
|
atomic_dec(&init_mm.context.attach_count);
|
|
}
|
|
|
|
void __noreturn cpu_die(void)
|
|
{
|
|
idle_task_exit();
|
|
while (sigp(smp_processor_id(), sigp_stop) == sigp_busy)
|
|
cpu_relax();
|
|
for (;;);
|
|
}
|
|
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
void __init smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
#ifndef CONFIG_64BIT
|
|
unsigned long save_area = 0;
|
|
#endif
|
|
unsigned long async_stack, panic_stack;
|
|
struct _lowcore *lowcore;
|
|
|
|
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");
|
|
/* request the 0x1202 external call external interrupt */
|
|
if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0)
|
|
panic("Couldn't request external interrupt 0x1202");
|
|
|
|
/* Reallocate current lowcore, but keep its contents. */
|
|
lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER);
|
|
panic_stack = __get_free_page(GFP_KERNEL);
|
|
async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
|
|
BUG_ON(!lowcore || !panic_stack || !async_stack);
|
|
#ifndef CONFIG_64BIT
|
|
if (MACHINE_HAS_IEEE)
|
|
save_area = get_zeroed_page(GFP_KERNEL);
|
|
#endif
|
|
local_irq_disable();
|
|
local_mcck_disable();
|
|
lowcore_ptr[smp_processor_id()] = lowcore;
|
|
*lowcore = S390_lowcore;
|
|
lowcore->panic_stack = panic_stack + PAGE_SIZE;
|
|
lowcore->async_stack = async_stack + ASYNC_SIZE;
|
|
#ifndef CONFIG_64BIT
|
|
if (MACHINE_HAS_IEEE)
|
|
lowcore->extended_save_area_addr = (u32) save_area;
|
|
#endif
|
|
set_prefix((u32)(unsigned long) lowcore);
|
|
local_mcck_enable();
|
|
local_irq_enable();
|
|
#ifdef CONFIG_64BIT
|
|
if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore))
|
|
BUG();
|
|
#endif
|
|
}
|
|
|
|
void __init smp_prepare_boot_cpu(void)
|
|
{
|
|
BUG_ON(smp_processor_id() != 0);
|
|
|
|
current_thread_info()->cpu = 0;
|
|
set_cpu_present(0, true);
|
|
set_cpu_online(0, true);
|
|
S390_lowcore.percpu_offset = __per_cpu_offset[0];
|
|
current_set[0] = current;
|
|
smp_cpu_state[0] = CPU_STATE_CONFIGURED;
|
|
smp_cpu_polarization[0] = POLARIZATION_UNKNWN;
|
|
}
|
|
|
|
void __init smp_cpus_done(unsigned int max_cpus)
|
|
{
|
|
}
|
|
|
|
void __init smp_setup_processor_id(void)
|
|
{
|
|
S390_lowcore.cpu_nr = 0;
|
|
__cpu_logical_map[0] = stap();
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
static ssize_t cpu_configure_show(struct sys_device *dev,
|
|
struct sysdev_attribute *attr, 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,
|
|
struct sysdev_attribute *attr,
|
|
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;
|
|
|
|
get_online_cpus();
|
|
mutex_lock(&smp_cpu_state_mutex);
|
|
rc = -EBUSY;
|
|
/* disallow configuration changes of online cpus and cpu 0 */
|
|
if (cpu_online(cpu) || cpu == 0)
|
|
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;
|
|
smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
|
|
}
|
|
}
|
|
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;
|
|
smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
out:
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
|
put_online_cpus();
|
|
return rc ? rc : count;
|
|
}
|
|
static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
static ssize_t cpu_polarization_show(struct sys_device *dev,
|
|
struct sysdev_attribute *attr, char *buf)
|
|
{
|
|
int cpu = dev->id;
|
|
ssize_t count;
|
|
|
|
mutex_lock(&smp_cpu_state_mutex);
|
|
switch (smp_cpu_polarization[cpu]) {
|
|
case POLARIZATION_HRZ:
|
|
count = sprintf(buf, "horizontal\n");
|
|
break;
|
|
case POLARIZATION_VL:
|
|
count = sprintf(buf, "vertical:low\n");
|
|
break;
|
|
case POLARIZATION_VM:
|
|
count = sprintf(buf, "vertical:medium\n");
|
|
break;
|
|
case POLARIZATION_VH:
|
|
count = sprintf(buf, "vertical:high\n");
|
|
break;
|
|
default:
|
|
count = sprintf(buf, "unknown\n");
|
|
break;
|
|
}
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
|
return count;
|
|
}
|
|
static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL);
|
|
|
|
static ssize_t show_cpu_address(struct sys_device *dev,
|
|
struct sysdev_attribute *attr, 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,
|
|
&attr_polarization.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group cpu_common_attr_group = {
|
|
.attrs = cpu_common_attrs,
|
|
};
|
|
|
|
static ssize_t show_capability(struct sys_device *dev,
|
|
struct sysdev_attribute *attr, 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,
|
|
struct sysdev_attribute *attr, char *buf)
|
|
{
|
|
struct s390_idle_data *idle;
|
|
unsigned long long idle_count;
|
|
unsigned int sequence;
|
|
|
|
idle = &per_cpu(s390_idle, dev->id);
|
|
repeat:
|
|
sequence = idle->sequence;
|
|
smp_rmb();
|
|
if (sequence & 1)
|
|
goto repeat;
|
|
idle_count = idle->idle_count;
|
|
if (idle->idle_enter)
|
|
idle_count++;
|
|
smp_rmb();
|
|
if (idle->sequence != sequence)
|
|
goto repeat;
|
|
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,
|
|
struct sysdev_attribute *attr, char *buf)
|
|
{
|
|
struct s390_idle_data *idle;
|
|
unsigned long long now, idle_time, idle_enter;
|
|
unsigned int sequence;
|
|
|
|
idle = &per_cpu(s390_idle, dev->id);
|
|
now = get_clock();
|
|
repeat:
|
|
sequence = idle->sequence;
|
|
smp_rmb();
|
|
if (sequence & 1)
|
|
goto repeat;
|
|
idle_time = idle->idle_time;
|
|
idle_enter = idle->idle_enter;
|
|
if (idle_enter != 0ULL && idle_enter < now)
|
|
idle_time += now - idle_enter;
|
|
smp_rmb();
|
|
if (idle->sequence != sequence)
|
|
goto repeat;
|
|
return sprintf(buf, "%llu\n", idle_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;
|
|
int err = 0;
|
|
|
|
switch (action) {
|
|
case CPU_ONLINE:
|
|
case CPU_ONLINE_FROZEN:
|
|
idle = &per_cpu(s390_idle, cpu);
|
|
memset(idle, 0, sizeof(struct s390_idle_data));
|
|
err = sysfs_create_group(&s->kobj, &cpu_online_attr_group);
|
|
break;
|
|
case CPU_DEAD:
|
|
case CPU_DEAD_FROZEN:
|
|
sysfs_remove_group(&s->kobj, &cpu_online_attr_group);
|
|
break;
|
|
}
|
|
return notifier_from_errno(err);
|
|
}
|
|
|
|
static struct notifier_block __cpuinitdata smp_cpu_nb = {
|
|
.notifier_call = smp_cpu_notify,
|
|
};
|
|
|
|
static int __devinit 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
|
|
|
|
int __ref smp_rescan_cpus(void)
|
|
{
|
|
cpumask_t newcpus;
|
|
int cpu;
|
|
int rc;
|
|
|
|
get_online_cpus();
|
|
mutex_lock(&smp_cpu_state_mutex);
|
|
cpumask_copy(&newcpus, cpu_present_mask);
|
|
rc = __smp_rescan_cpus();
|
|
if (rc)
|
|
goto out;
|
|
cpumask_andnot(&newcpus, cpu_present_mask, &newcpus);
|
|
for_each_cpu(cpu, &newcpus) {
|
|
rc = smp_add_present_cpu(cpu);
|
|
if (rc)
|
|
set_cpu_present(cpu, false);
|
|
}
|
|
rc = 0;
|
|
out:
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
|
put_online_cpus();
|
|
if (!cpumask_empty(&newcpus))
|
|
topology_schedule_update();
|
|
return rc;
|
|
}
|
|
|
|
static ssize_t __ref rescan_store(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
int rc;
|
|
|
|
rc = smp_rescan_cpus();
|
|
return rc ? rc : count;
|
|
}
|
|
static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store);
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
static ssize_t dispatching_show(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t count;
|
|
|
|
mutex_lock(&smp_cpu_state_mutex);
|
|
count = sprintf(buf, "%d\n", cpu_management);
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t dispatching_store(struct sysdev_class *dev,
|
|
struct sysdev_class_attribute *attr,
|
|
const char *buf,
|
|
size_t count)
|
|
{
|
|
int val, rc;
|
|
char delim;
|
|
|
|
if (sscanf(buf, "%d %c", &val, &delim) != 1)
|
|
return -EINVAL;
|
|
if (val != 0 && val != 1)
|
|
return -EINVAL;
|
|
rc = 0;
|
|
get_online_cpus();
|
|
mutex_lock(&smp_cpu_state_mutex);
|
|
if (cpu_management == val)
|
|
goto out;
|
|
rc = topology_set_cpu_management(val);
|
|
if (!rc)
|
|
cpu_management = val;
|
|
out:
|
|
mutex_unlock(&smp_cpu_state_mutex);
|
|
put_online_cpus();
|
|
return rc ? rc : count;
|
|
}
|
|
static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show,
|
|
dispatching_store);
|
|
|
|
static int __init topology_init(void)
|
|
{
|
|
int cpu;
|
|
int rc;
|
|
|
|
register_cpu_notifier(&smp_cpu_nb);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_rescan);
|
|
if (rc)
|
|
return rc;
|
|
#endif
|
|
rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_dispatching);
|
|
if (rc)
|
|
return rc;
|
|
for_each_present_cpu(cpu) {
|
|
rc = smp_add_present_cpu(cpu);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
subsys_initcall(topology_init);
|