X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fs390%2Fkernel%2Fsmp.c;h=343120c9223d798d6cad38703153df30f83e683b;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=91746632e1d5695450d8ecf9341b0d9d6629fd92;hpb=9213980e6a70d8473e0ffd4b39ab5b6caaba9ff5;p=linux-2.6.git diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 91746632e..343120c92 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -1,10 +1,10 @@ /* * arch/s390/kernel/smp.c * - * S390 version - * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Copyright (C) IBM Corp. 1999,2006 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) + * Heiko Carstens (heiko.carstens@de.ibm.com) * * based on other smp stuff by * (c) 1995 Alan Cox, CymruNET Ltd @@ -40,9 +40,6 @@ #include #include -/* prototypes */ -extern int cpu_idle(void * unused); - extern volatile int __cpu_logical_map[]; /* @@ -50,14 +47,11 @@ extern volatile int __cpu_logical_map[]; */ struct _lowcore *lowcore_ptr[NR_CPUS]; -cycles_t cacheflush_time=0; -int smp_threads_ready=0; /* Set when the idlers are all forked. */ -cpumask_t cpu_online_map; -cpumask_t cpu_possible_map; -unsigned long cache_decay_ticks = 0; +cpumask_t cpu_online_map = CPU_MASK_NONE; +cpumask_t cpu_possible_map = CPU_MASK_NONE; -EXPORT_SYMBOL(cpu_online_map); +static struct task_struct *current_set[NR_CPUS]; /* * Reboot, halt and power_off routines for SMP. @@ -66,6 +60,7 @@ extern char vmhalt_cmd[]; extern char vmpoff_cmd[]; extern void reipl(unsigned long devno); +extern void reipl_diag(void); static void smp_ext_bitcall(int, ec_bit_sig); static void smp_ext_bitcall_others(ec_bit_sig); @@ -74,7 +69,7 @@ static void smp_ext_bitcall_others(ec_bit_sig); * Structure and data for smp_call_function(). This is designed to minimise * static memory requirements. It also looks cleaner. */ -static spinlock_t call_lock = SPIN_LOCK_UNLOCKED; +static DEFINE_SPINLOCK(call_lock); struct call_data_struct { void (*func) (void *info); @@ -124,7 +119,6 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic, struct call_data_struct data; int cpus = num_online_cpus()-1; - /* FIXME: get cpu lock -hc */ if (cpus <= 0) return 0; @@ -211,33 +205,30 @@ EXPORT_SYMBOL(smp_call_function_on); static inline void do_send_stop(void) { - unsigned long dummy; - int i, rc; + int cpu, rc; /* stop all processors */ - for (i = 0; i < NR_CPUS; i++) { - if (!cpu_online(i) || smp_processor_id() == i) + for_each_online_cpu(cpu) { + if (cpu == smp_processor_id()) continue; do { - rc = signal_processor_ps(&dummy, 0, i, sigp_stop); + rc = signal_processor(cpu, sigp_stop); } while (rc == sigp_busy); } } static inline void do_store_status(void) { - unsigned long low_core_addr; - unsigned long dummy; - int i, rc; + int cpu, rc; /* store status of all processors in their lowcores (real 0) */ - for (i = 0; i < NR_CPUS; i++) { - if (!cpu_online(i) || smp_processor_id() == i) + for_each_online_cpu(cpu) { + if (cpu == smp_processor_id()) continue; - low_core_addr = (unsigned long) lowcore_ptr[i]; do { - rc = signal_processor_ps(&dummy, low_core_addr, i, - sigp_store_status_at_address); + rc = signal_processor_p( + (__u32)(unsigned long) lowcore_ptr[cpu], cpu, + sigp_store_status_at_address); } while(rc == sigp_busy); } } @@ -261,35 +252,43 @@ void smp_send_stop(void) /* * Reboot, halt and power_off routines for SMP. */ -static cpumask_t cpu_restart_map; static void do_machine_restart(void * __unused) { - cpu_clear(smp_processor_id(), cpu_restart_map); - if (smp_processor_id() == 0) { - /* Wait for all other cpus to enter do_machine_restart. */ - while (!cpus_empty(cpu_restart_map)) + int cpu; + static atomic_t cpuid = ATOMIC_INIT(-1); + + if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) != -1) + signal_processor(smp_processor_id(), sigp_stop); + + /* Wait for all other cpus to enter stopped state */ + for_each_online_cpu(cpu) { + if (cpu == smp_processor_id()) + continue; + while(!smp_cpu_not_running(cpu)) cpu_relax(); - /* Store status of other cpus. */ - do_store_status(); - /* - * Finally call reipl. Because we waited for all other - * cpus to enter this function we know that they do - * not hold any s390irq-locks (the cpus have been - * interrupted by an external interrupt and s390irq - * locks are always held disabled). - */ - if (MACHINE_IS_VM) - cpcmd ("IPL", NULL, 0); - else - reipl (0x10000 | S390_lowcore.ipl_device); } - signal_processor(smp_processor_id(), sigp_stop); + + /* Store status of other cpus. */ + do_store_status(); + + /* + * Finally call reipl. Because we waited for all other + * cpus to enter this function we know that they do + * not hold any s390irq-locks (the cpus have been + * interrupted by an external interrupt and s390irq + * locks are always held disabled). + */ + reipl_diag(); + + if (MACHINE_IS_VM) + cpcmd ("IPL", NULL, 0, NULL); + else + reipl (0x10000 | S390_lowcore.ipl_device); } void machine_restart_smp(char * __unused) { - cpu_restart_map = cpu_online_map; on_each_cpu(do_machine_restart, NULL, 0, 0); } @@ -307,10 +306,12 @@ static void do_wait_for_stop(void) static void do_machine_halt(void * __unused) { - if (smp_processor_id() == 0) { + static atomic_t cpuid = ATOMIC_INIT(-1); + + if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) { smp_send_stop(); if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) - cpcmd(vmhalt_cmd, NULL, 0); + cpcmd(vmhalt_cmd, NULL, 0, NULL); signal_processor(smp_processor_id(), sigp_stop_and_store_status); } @@ -324,10 +325,12 @@ void machine_halt_smp(void) static void do_machine_power_off(void * __unused) { - if (smp_processor_id() == 0) { + static atomic_t cpuid = ATOMIC_INIT(-1); + + if (atomic_cmpxchg(&cpuid, -1, smp_processor_id()) == -1) { smp_send_stop(); if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) - cpcmd(vmpoff_cmd, NULL, 0); + cpcmd(vmpoff_cmd, NULL, 0, NULL); signal_processor(smp_processor_id(), sigp_stop_and_store_status); } @@ -370,7 +373,7 @@ static void smp_ext_bitcall(int cpu, ec_bit_sig sig) * Set signaling bit in lowcore of target cpu and kick it */ set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); - while(signal_processor(cpu, sigp_external_call) == sigp_busy) + while(signal_processor(cpu, sigp_emergency_signal) == sigp_busy) udelay(10); } @@ -380,21 +383,21 @@ static void smp_ext_bitcall(int cpu, ec_bit_sig sig) */ static void smp_ext_bitcall_others(ec_bit_sig sig) { - int i; + int cpu; - for (i = 0; i < NR_CPUS; i++) { - if (!cpu_online(i) || smp_processor_id() == i) + for_each_online_cpu(cpu) { + if (cpu == smp_processor_id()) continue; /* * Set signaling bit in lowcore of target cpu and kick it */ - set_bit(sig, (unsigned long *) &lowcore_ptr[i]->ext_call_fast); - while (signal_processor(i, sigp_external_call) == sigp_busy) + set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); + while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) udelay(10); } } -#ifndef CONFIG_ARCH_S390X +#ifndef CONFIG_64BIT /* * this function sends a 'purge tlb' signal to another CPU. */ @@ -408,7 +411,7 @@ void smp_ptlb_all(void) on_each_cpu(smp_ptlb_callback, NULL, 0, 1); } EXPORT_SYMBOL(smp_ptlb_all); -#endif /* ! CONFIG_ARCH_S390X */ +#endif /* ! CONFIG_64BIT */ /* * this function sends a 'reschedule' IPI to another CPU. @@ -482,45 +485,57 @@ void smp_ctl_clear_bit(int cr, int bit) { * Lets check how many CPUs we have. */ -void __init smp_check_cpus(unsigned int max_cpus) +static unsigned int +__init smp_count_cpus(void) { - int curr_cpu, num_cpus; + unsigned int cpu, num_cpus; __u16 boot_cpu_addr; + /* + * cpu 0 is the boot cpu. See smp_prepare_boot_cpu. + */ + boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr; - current_thread_info()->cpu = 0; - num_cpus = 1; - for (curr_cpu = 0; - curr_cpu <= 65535 && num_cpus < max_cpus; curr_cpu++) { - if ((__u16) curr_cpu == boot_cpu_addr) - continue; - __cpu_logical_map[num_cpus] = (__u16) curr_cpu; - if (signal_processor(num_cpus, sigp_sense) == - sigp_not_operational) - continue; - cpu_set(num_cpus, cpu_possible_map); - num_cpus++; - } - printk("Detected %d CPU's\n",(int) num_cpus); - printk("Boot cpu address %2X\n", boot_cpu_addr); + current_thread_info()->cpu = 0; + num_cpus = 1; + for (cpu = 0; cpu <= 65535; cpu++) { + if ((__u16) cpu == boot_cpu_addr) + continue; + __cpu_logical_map[1] = (__u16) cpu; + if (signal_processor(1, sigp_sense) == + sigp_not_operational) + continue; + num_cpus++; + } + + printk("Detected %d CPU's\n",(int) num_cpus); + printk("Boot cpu address %2X\n", boot_cpu_addr); + + return num_cpus; } /* * Activate a secondary processor. */ extern void init_cpu_timer(void); +extern void init_cpu_vtimer(void); extern int pfault_init(void); -extern int pfault_token(void); +extern void pfault_fini(void); int __devinit start_secondary(void *cpuvoid) { /* Setup the cpu */ cpu_init(); + preempt_disable(); /* init per CPU timer */ init_cpu_timer(); +#ifdef CONFIG_VIRT_TIMER + init_cpu_vtimer(); +#endif #ifdef CONFIG_PFAULT /* Enable pfault pseudo page faults on this cpu. */ - pfault_init(); + if (MACHINE_IS_VM) + pfault_init(); #endif /* Mark this cpu as online */ cpu_set(smp_processor_id(), cpu_online_map); @@ -529,29 +544,101 @@ int __devinit start_secondary(void *cpuvoid) /* Print info about this processor */ print_cpu_info(&S390_lowcore.cpu_data); /* cpu_idle will call schedule for us */ - return cpu_idle(NULL); + cpu_idle(); + return 0; } -static struct task_struct *__devinit fork_by_hand(void) +static void __init smp_create_idle(unsigned int cpu) { - struct pt_regs regs; - /* don't care about the psw and regs settings since we'll never - reschedule the forked task. */ - memset(®s,0,sizeof(struct pt_regs)); - return copy_process(CLONE_VM|CLONE_IDLETASK, 0, ®s, 0, NULL, NULL); + 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; } -int __cpu_up(unsigned int cpu) +/* 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) { - struct task_struct *idle; + 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; - /* - * Set prefix page for new cpu - */ + for (curr_cpu = 0; curr_cpu <= 65535; curr_cpu++) { + __cpu_logical_map[cpu] = (__u16) curr_cpu; + if (cpu_stopped(cpu)) + break; + } - ccode = signal_processor_p((unsigned long)(lowcore_ptr[cpu]), + 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 " @@ -560,27 +647,16 @@ int __cpu_up(unsigned int cpu) return -EIO; } - /* We can't use kernel_thread since we must _avoid_ to reschedule - the child. */ - idle = fork_by_hand(); - if (IS_ERR(idle)){ - printk("failed fork for CPU %d", cpu); - return -EIO; - } - wake_up_forked_process(idle); - - /* - * We remove it from the pidhash and the runqueue - * once we got the process: - */ - init_idle(idle, cpu); - - unhash_process(idle); - + idle = current_set[cpu]; cpu_lowcore = lowcore_ptr[cpu]; - cpu_lowcore->save_area[15] = idle->thread.ksp; cpu_lowcore->kernel_stack = (unsigned long) - idle->thread_info + (THREAD_SIZE); + 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) @@ -589,11 +665,122 @@ int __cpu_up(unsigned int cpu) cpu_lowcore->current_task = (unsigned long) idle; cpu_lowcore->cpu_data.cpu_nr = cpu; eieio(); - signal_processor(cpu,sigp_restart); - while (!cpu_online(cpu)); + 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. @@ -601,44 +788,66 @@ int __cpu_up(unsigned int cpu) void __init smp_prepare_cpus(unsigned int max_cpus) { - unsigned long async_stack; + unsigned long stack; + unsigned int cpu; int i; - /* request the 0x1202 external interrupt */ - if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0) - panic("Couldn't request external interrupt 0x1202"); - smp_check_cpus(max_cpus); + /* request the 0x1201 emergency signal external interrupt */ + if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) + panic("Couldn't request external interrupt 0x1201"); memset(lowcore_ptr,0,sizeof(lowcore_ptr)); /* * Initialize prefix pages and stacks for all possible cpus */ print_cpu_info(&S390_lowcore.cpu_data); - for(i = 0; i < NR_CPUS; i++) { - if (!cpu_possible(i)) - continue; + for_each_possible_cpu(i) { lowcore_ptr[i] = (struct _lowcore *) __get_free_pages(GFP_KERNEL|GFP_DMA, sizeof(void*) == 8 ? 1 : 0); - async_stack = __get_free_pages(GFP_KERNEL,ASYNC_ORDER); - if (lowcore_ptr[i] == NULL || async_stack == 0ULL) + 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 = async_stack + (ASYNC_SIZE); + 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) { - cpu_set(smp_processor_id(), cpu_online_map); - cpu_set(smp_processor_id(), cpu_possible_map); - S390_lowcore.percpu_offset = __per_cpu_offset[smp_processor_id()]; + 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; } /* @@ -659,7 +868,7 @@ static int __init topology_init(void) int cpu; int ret; - for_each_cpu(cpu) { + 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 " @@ -670,8 +879,12 @@ static int __init topology_init(void) 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); +