12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds ** SMP Support 41da177e4SLinus Torvalds ** 51da177e4SLinus Torvalds ** Copyright (C) 1999 Walt Drummond <drummond@valinux.com> 61da177e4SLinus Torvalds ** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> 71da177e4SLinus Torvalds ** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org> 81da177e4SLinus Torvalds ** 91da177e4SLinus Torvalds ** Lots of stuff stolen from arch/alpha/kernel/smp.c 101da177e4SLinus Torvalds ** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^) 111da177e4SLinus Torvalds ** 121da177e4SLinus Torvalds ** Thanks to John Curry and Ullas Ponnadi. I learned a lot from their work. 131da177e4SLinus Torvalds ** -grant (1/12/2001) 141da177e4SLinus Torvalds ** 151da177e4SLinus Torvalds */ 161da177e4SLinus Torvalds #include <linux/types.h> 171da177e4SLinus Torvalds #include <linux/spinlock.h> 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <linux/kernel.h> 201da177e4SLinus Torvalds #include <linux/module.h> 2168e21be2SIngo Molnar #include <linux/sched/mm.h> 221da177e4SLinus Torvalds #include <linux/init.h> 231da177e4SLinus Torvalds #include <linux/interrupt.h> 241da177e4SLinus Torvalds #include <linux/smp.h> 251da177e4SLinus Torvalds #include <linux/kernel_stat.h> 261da177e4SLinus Torvalds #include <linux/mm.h> 274e950f6fSAlexey Dobriyan #include <linux/err.h> 281da177e4SLinus Torvalds #include <linux/delay.h> 291da177e4SLinus Torvalds #include <linux/bitops.h> 30d75f054aSHelge Deller #include <linux/ftrace.h> 31ec2e0f98SSrivatsa S. Bhat #include <linux/cpu.h> 321da177e4SLinus Torvalds 3360063497SArun Sharma #include <linux/atomic.h> 341da177e4SLinus Torvalds #include <asm/current.h> 351da177e4SLinus Torvalds #include <asm/delay.h> 361b2425e3SMatthew Wilcox #include <asm/tlbflush.h> 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #include <asm/io.h> 391da177e4SLinus Torvalds #include <asm/irq.h> /* for CPU_IRQ_REGION and friends */ 401da177e4SLinus Torvalds #include <asm/mmu_context.h> 411da177e4SLinus Torvalds #include <asm/page.h> 421da177e4SLinus Torvalds #include <asm/pgtable.h> 431da177e4SLinus Torvalds #include <asm/pgalloc.h> 441da177e4SLinus Torvalds #include <asm/processor.h> 451da177e4SLinus Torvalds #include <asm/ptrace.h> 461da177e4SLinus Torvalds #include <asm/unistd.h> 471da177e4SLinus Torvalds #include <asm/cacheflush.h> 481da177e4SLinus Torvalds 495492a0f0SKyle McMartin #undef DEBUG_SMP 505492a0f0SKyle McMartin #ifdef DEBUG_SMP 515492a0f0SKyle McMartin static int smp_debug_lvl = 0; 525492a0f0SKyle McMartin #define smp_debug(lvl, printargs...) \ 535492a0f0SKyle McMartin if (lvl >= smp_debug_lvl) \ 545492a0f0SKyle McMartin printk(printargs); 555492a0f0SKyle McMartin #else 56ef017bebSHelge Deller #define smp_debug(lvl, ...) do { } while(0) 575492a0f0SKyle McMartin #endif /* DEBUG_SMP */ 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds volatile struct task_struct *smp_init_current_idle_task; 601da177e4SLinus Torvalds 61ef017bebSHelge Deller /* track which CPU is booting */ 6260ffef06SPaul Gortmaker static volatile int cpu_now_booting; 631da177e4SLinus Torvalds 6460ffef06SPaul Gortmaker static int parisc_max_cpus = 1; 651da177e4SLinus Torvalds 666ad6c424SThomas Gleixner static DEFINE_PER_CPU(spinlock_t, ipi_lock); 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds enum ipi_message_type { 691da177e4SLinus Torvalds IPI_NOP=0, 701da177e4SLinus Torvalds IPI_RESCHEDULE=1, 711da177e4SLinus Torvalds IPI_CALL_FUNC, 721da177e4SLinus Torvalds IPI_CPU_START, 731da177e4SLinus Torvalds IPI_CPU_STOP, 741da177e4SLinus Torvalds IPI_CPU_TEST 751da177e4SLinus Torvalds }; 761da177e4SLinus Torvalds 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds /********** SMP inter processor interrupt and communication routines */ 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds #undef PER_CPU_IRQ_REGION 811da177e4SLinus Torvalds #ifdef PER_CPU_IRQ_REGION 821da177e4SLinus Torvalds /* XXX REVISIT Ignore for now. 831da177e4SLinus Torvalds ** *May* need this "hook" to register IPI handler 841da177e4SLinus Torvalds ** once we have perCPU ExtIntr switch tables. 851da177e4SLinus Torvalds */ 861da177e4SLinus Torvalds static void 871da177e4SLinus Torvalds ipi_init(int cpuid) 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds if(cpu_online(cpuid) ) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds switch_to_idle_task(current); 941da177e4SLinus Torvalds } 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds return; 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds #endif 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds /* 1021da177e4SLinus Torvalds ** Yoink this CPU from the runnable list... 1031da177e4SLinus Torvalds ** 1041da177e4SLinus Torvalds */ 1051da177e4SLinus Torvalds static void 1061da177e4SLinus Torvalds halt_processor(void) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds /* REVISIT : redirect I/O Interrupts to another CPU? */ 1091da177e4SLinus Torvalds /* REVISIT : does PM *know* this CPU isn't available? */ 1109bc181d8SRusty Russell set_cpu_online(smp_processor_id(), false); 1111da177e4SLinus Torvalds local_irq_disable(); 112507efd63SSven Schnelle __pdc_cpu_rendezvous(); 1131da177e4SLinus Torvalds for (;;) 1141da177e4SLinus Torvalds ; 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds 118d75f054aSHelge Deller irqreturn_t __irq_entry 119c7753f18SMatthew Wilcox ipi_interrupt(int irq, void *dev_id) 1201da177e4SLinus Torvalds { 1211da177e4SLinus Torvalds int this_cpu = smp_processor_id(); 122ef017bebSHelge Deller struct cpuinfo_parisc *p = &per_cpu(cpu_data, this_cpu); 1231da177e4SLinus Torvalds unsigned long ops; 1241da177e4SLinus Torvalds unsigned long flags; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds for (;;) { 1273c97b5e9SKyle McMartin spinlock_t *lock = &per_cpu(ipi_lock, this_cpu); 1283c97b5e9SKyle McMartin spin_lock_irqsave(lock, flags); 1291da177e4SLinus Torvalds ops = p->pending_ipi; 1301da177e4SLinus Torvalds p->pending_ipi = 0; 1313c97b5e9SKyle McMartin spin_unlock_irqrestore(lock, flags); 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds mb(); /* Order bit clearing and data access. */ 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds if (!ops) 1361da177e4SLinus Torvalds break; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds while (ops) { 1391da177e4SLinus Torvalds unsigned long which = ffz(~ops); 1401da177e4SLinus Torvalds 141d911aed8SJames Bottomley ops &= ~(1 << which); 142d911aed8SJames Bottomley 1431da177e4SLinus Torvalds switch (which) { 144d911aed8SJames Bottomley case IPI_NOP: 1455492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu); 146d911aed8SJames Bottomley break; 147d911aed8SJames Bottomley 1481da177e4SLinus Torvalds case IPI_RESCHEDULE: 1495492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu); 150cd85d551SHelge Deller inc_irq_stat(irq_resched_count); 151184748ccSPeter Zijlstra scheduler_ipi(); 1521da177e4SLinus Torvalds break; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds case IPI_CALL_FUNC: 1555492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu); 156b102f29bSHelge Deller inc_irq_stat(irq_call_count); 157dbcf4787SJens Axboe generic_smp_call_function_interrupt(); 158dbcf4787SJens Axboe break; 1591da177e4SLinus Torvalds 1601da177e4SLinus Torvalds case IPI_CPU_START: 1615492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu); 1621da177e4SLinus Torvalds break; 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds case IPI_CPU_STOP: 1655492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu); 1661da177e4SLinus Torvalds halt_processor(); 1671da177e4SLinus Torvalds break; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds case IPI_CPU_TEST: 1705492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu); 1711da177e4SLinus Torvalds break; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds default: 1741da177e4SLinus Torvalds printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n", 1751da177e4SLinus Torvalds this_cpu, which); 1761da177e4SLinus Torvalds return IRQ_NONE; 1771da177e4SLinus Torvalds } /* Switch */ 1787085689eSJames Bottomley /* let in any pending interrupts */ 1797085689eSJames Bottomley local_irq_enable(); 1807085689eSJames Bottomley local_irq_disable(); 1811da177e4SLinus Torvalds } /* while (ops) */ 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds return IRQ_HANDLED; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds static inline void 1881da177e4SLinus Torvalds ipi_send(int cpu, enum ipi_message_type op) 1891da177e4SLinus Torvalds { 190ef017bebSHelge Deller struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpu); 1913c97b5e9SKyle McMartin spinlock_t *lock = &per_cpu(ipi_lock, cpu); 1921da177e4SLinus Torvalds unsigned long flags; 1931da177e4SLinus Torvalds 1943c97b5e9SKyle McMartin spin_lock_irqsave(lock, flags); 1951da177e4SLinus Torvalds p->pending_ipi |= 1 << op; 196ef017bebSHelge Deller gsc_writel(IPI_IRQ - CPU_IRQ_BASE, p->hpa); 1973c97b5e9SKyle McMartin spin_unlock_irqrestore(lock, flags); 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 200dbcf4787SJens Axboe static void 20191887a36SRusty Russell send_IPI_mask(const struct cpumask *mask, enum ipi_message_type op) 202dbcf4787SJens Axboe { 203dbcf4787SJens Axboe int cpu; 204dbcf4787SJens Axboe 20591887a36SRusty Russell for_each_cpu(cpu, mask) 206dbcf4787SJens Axboe ipi_send(cpu, op); 207dbcf4787SJens Axboe } 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds static inline void 2101da177e4SLinus Torvalds send_IPI_single(int dest_cpu, enum ipi_message_type op) 2111da177e4SLinus Torvalds { 2127f2347a4SHelge Deller BUG_ON(dest_cpu == NO_PROC_ID); 2131da177e4SLinus Torvalds 2141da177e4SLinus Torvalds ipi_send(dest_cpu, op); 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds static inline void 2181da177e4SLinus Torvalds send_IPI_allbutself(enum ipi_message_type op) 2191da177e4SLinus Torvalds { 2201da177e4SLinus Torvalds int i; 2211da177e4SLinus Torvalds 222394e3902SAndrew Morton for_each_online_cpu(i) { 223394e3902SAndrew Morton if (i != smp_processor_id()) 2241da177e4SLinus Torvalds send_IPI_single(i, op); 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds inline void 2301da177e4SLinus Torvalds smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds void 2331da177e4SLinus Torvalds smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); } 2341da177e4SLinus Torvalds 235d911aed8SJames Bottomley void 236d911aed8SJames Bottomley smp_send_all_nop(void) 237d911aed8SJames Bottomley { 238d911aed8SJames Bottomley send_IPI_allbutself(IPI_NOP); 239d911aed8SJames Bottomley } 240d911aed8SJames Bottomley 24191887a36SRusty Russell void arch_send_call_function_ipi_mask(const struct cpumask *mask) 2421da177e4SLinus Torvalds { 243dbcf4787SJens Axboe send_IPI_mask(mask, IPI_CALL_FUNC); 2441da177e4SLinus Torvalds } 2451da177e4SLinus Torvalds 246dbcf4787SJens Axboe void arch_send_call_function_single_ipi(int cpu) 247dbcf4787SJens Axboe { 248528d8eb2SJiang Liu send_IPI_single(cpu, IPI_CALL_FUNC); 2491da177e4SLinus Torvalds } 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds /* 2521da177e4SLinus Torvalds * Called by secondaries to update state and initialize CPU registers. 2531da177e4SLinus Torvalds */ 2541da177e4SLinus Torvalds static void __init 2551da177e4SLinus Torvalds smp_cpu_init(int cpunum) 2561da177e4SLinus Torvalds { 2571da177e4SLinus Torvalds extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */ 25856f335c8SGrant Grundler extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */ 2591da177e4SLinus Torvalds 2601da177e4SLinus Torvalds /* Set modes and Enable floating point coprocessor */ 261a7e6601fSHelge Deller init_per_cpu(cpunum); 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds disable_sr_hashing(); 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds mb(); 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds /* Well, support 2.4 linux scheme as well. */ 2687ec6118cSRusty Russell if (cpu_online(cpunum)) { 2691da177e4SLinus Torvalds extern void machine_halt(void); /* arch/parisc.../process.c */ 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum); 2721da177e4SLinus Torvalds machine_halt(); 2731da177e4SLinus Torvalds } 274ec2e0f98SSrivatsa S. Bhat 275ec2e0f98SSrivatsa S. Bhat notify_cpu_starting(cpunum); 276ec2e0f98SSrivatsa S. Bhat 2779bc181d8SRusty Russell set_cpu_online(cpunum, true); 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvalds /* Initialise the idle task for this CPU */ 280f1f10076SVegard Nossum mmgrab(&init_mm); 2811da177e4SLinus Torvalds current->active_mm = &init_mm; 2827f2347a4SHelge Deller BUG_ON(current->mm); 2831da177e4SLinus Torvalds enter_lazy_tlb(&init_mm, current); 2841da177e4SLinus Torvalds 2857022672eSSimon Arlott init_IRQ(); /* make sure no IRQs are enabled or pending */ 28656f335c8SGrant Grundler start_cpu_itimer(); 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds /* 2911da177e4SLinus Torvalds * Slaves start using C here. Indirectly called from smp_slave_stext. 2921da177e4SLinus Torvalds * Do what start_kernel() and main() do for boot strap processor (aka monarch) 2931da177e4SLinus Torvalds */ 2940ed1fe4aSHelge Deller void __init smp_callin(unsigned long pdce_proc) 2951da177e4SLinus Torvalds { 2961da177e4SLinus Torvalds int slave_id = cpu_now_booting; 2971da177e4SLinus Torvalds 2980ed1fe4aSHelge Deller #ifdef CONFIG_64BIT 2990ed1fe4aSHelge Deller WARN_ON(((unsigned long)(PAGE0->mem_pdc_hi) << 32 3000ed1fe4aSHelge Deller | PAGE0->mem_pdc) != pdce_proc); 3010ed1fe4aSHelge Deller #endif 3020ed1fe4aSHelge Deller 3031da177e4SLinus Torvalds smp_cpu_init(slave_id); 3045bfb5d69SNick Piggin preempt_disable(); 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds flush_cache_all_local(); /* start with known state */ 3071b2425e3SMatthew Wilcox flush_tlb_all_local(NULL); 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds local_irq_enable(); /* Interrupts have been off until now */ 3101da177e4SLinus Torvalds 311fc6d73d6SThomas Gleixner cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds /* NOTREACHED */ 3141da177e4SLinus Torvalds panic("smp_callin() AAAAaaaaahhhh....\n"); 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds /* 3181da177e4SLinus Torvalds * Bring one cpu online. 3191da177e4SLinus Torvalds */ 32060ffef06SPaul Gortmaker int smp_boot_one_cpu(int cpuid, struct task_struct *idle) 3211da177e4SLinus Torvalds { 322ef017bebSHelge Deller const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid); 3231da177e4SLinus Torvalds long timeout; 3241da177e4SLinus Torvalds 32540f1f0deSAl Viro task_thread_info(idle)->cpu = cpuid; 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds /* Let _start know what logical CPU we're booting 3281da177e4SLinus Torvalds ** (offset into init_tasks[],cpu_data[]) 3291da177e4SLinus Torvalds */ 3301da177e4SLinus Torvalds cpu_now_booting = cpuid; 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* 3331da177e4SLinus Torvalds ** boot strap code needs to know the task address since 3341da177e4SLinus Torvalds ** it also contains the process stack. 3351da177e4SLinus Torvalds */ 3361da177e4SLinus Torvalds smp_init_current_idle_task = idle ; 3371da177e4SLinus Torvalds mb(); 3381da177e4SLinus Torvalds 339ef017bebSHelge Deller printk(KERN_INFO "Releasing cpu %d now, hpa=%lx\n", cpuid, p->hpa); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds /* 3421da177e4SLinus Torvalds ** This gets PDC to release the CPU from a very tight loop. 3431da177e4SLinus Torvalds ** 3441da177e4SLinus Torvalds ** From the PA-RISC 2.0 Firmware Architecture Reference Specification: 3451da177e4SLinus Torvalds ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which 3461da177e4SLinus Torvalds ** is executed after receiving the rendezvous signal (an interrupt to 3471da177e4SLinus Torvalds ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the 3481da177e4SLinus Torvalds ** contents of memory are valid." 3491da177e4SLinus Torvalds */ 350ef017bebSHelge Deller gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, p->hpa); 3511da177e4SLinus Torvalds mb(); 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds /* 3541da177e4SLinus Torvalds * OK, wait a bit for that CPU to finish staggering about. 3551da177e4SLinus Torvalds * Slave will set a bit when it reaches smp_cpu_init(). 3561da177e4SLinus Torvalds * Once the "monarch CPU" sees the bit change, it can move on. 3571da177e4SLinus Torvalds */ 3581da177e4SLinus Torvalds for (timeout = 0; timeout < 10000; timeout++) { 3591da177e4SLinus Torvalds if(cpu_online(cpuid)) { 3601da177e4SLinus Torvalds /* Which implies Slave has started up */ 3611da177e4SLinus Torvalds cpu_now_booting = 0; 3621da177e4SLinus Torvalds smp_init_current_idle_task = NULL; 3631da177e4SLinus Torvalds goto alive ; 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds udelay(100); 3661da177e4SLinus Torvalds barrier(); 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); 3691da177e4SLinus Torvalds return -1; 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvalds alive: 3721da177e4SLinus Torvalds /* Remember the Slave data */ 3735492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n", 3741da177e4SLinus Torvalds cpuid, timeout * 100); 3751da177e4SLinus Torvalds return 0; 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 378ef017bebSHelge Deller void __init smp_prepare_boot_cpu(void) 3791da177e4SLinus Torvalds { 380ef017bebSHelge Deller int bootstrap_processor = per_cpu(cpu_data, 0).cpuid; 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds /* Setup BSP mappings */ 383ef017bebSHelge Deller printk(KERN_INFO "SMP: bootstrap CPU ID is %d\n", bootstrap_processor); 3841da177e4SLinus Torvalds 3859bc181d8SRusty Russell set_cpu_online(bootstrap_processor, true); 3869bc181d8SRusty Russell set_cpu_present(bootstrap_processor, true); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds /* 3921da177e4SLinus Torvalds ** inventory.c:do_inventory() hasn't yet been run and thus we 3937022672eSSimon Arlott ** don't 'discover' the additional CPUs until later. 3941da177e4SLinus Torvalds */ 3951da177e4SLinus Torvalds void __init smp_prepare_cpus(unsigned int max_cpus) 3961da177e4SLinus Torvalds { 3976ad6c424SThomas Gleixner int cpu; 3986ad6c424SThomas Gleixner 3996ad6c424SThomas Gleixner for_each_possible_cpu(cpu) 4006ad6c424SThomas Gleixner spin_lock_init(&per_cpu(ipi_lock, cpu)); 4016ad6c424SThomas Gleixner 4029bc181d8SRusty Russell init_cpu_present(cpumask_of(0)); 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds parisc_max_cpus = max_cpus; 4051da177e4SLinus Torvalds if (!max_cpus) 4061da177e4SLinus Torvalds printk(KERN_INFO "SMP mode deactivated.\n"); 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds void smp_cpus_done(unsigned int cpu_max) 4111da177e4SLinus Torvalds { 4121da177e4SLinus Torvalds return; 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds 41660ffef06SPaul Gortmaker int __cpu_up(unsigned int cpu, struct task_struct *tidle) 4171da177e4SLinus Torvalds { 4185baf919dSHelge Deller if (cpu != 0 && cpu < parisc_max_cpus && smp_boot_one_cpu(cpu, tidle)) 4195baf919dSHelge Deller return -ENOSYS; 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds return cpu_online(cpu) ? 0 : -ENOSYS; 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds 4241da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 42501f56832SHelge Deller int setup_profiling_timer(unsigned int multiplier) 4261da177e4SLinus Torvalds { 4271da177e4SLinus Torvalds return -EINVAL; 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds #endif 430