11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds ** SMP Support 31da177e4SLinus Torvalds ** 41da177e4SLinus Torvalds ** Copyright (C) 1999 Walt Drummond <drummond@valinux.com> 51da177e4SLinus Torvalds ** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> 61da177e4SLinus Torvalds ** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org> 71da177e4SLinus Torvalds ** 81da177e4SLinus Torvalds ** Lots of stuff stolen from arch/alpha/kernel/smp.c 91da177e4SLinus Torvalds ** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^) 101da177e4SLinus Torvalds ** 111da177e4SLinus Torvalds ** Thanks to John Curry and Ullas Ponnadi. I learned a lot from their work. 121da177e4SLinus Torvalds ** -grant (1/12/2001) 131da177e4SLinus Torvalds ** 141da177e4SLinus Torvalds ** This program is free software; you can redistribute it and/or modify 151da177e4SLinus Torvalds ** it under the terms of the GNU General Public License as published by 161da177e4SLinus Torvalds ** the Free Software Foundation; either version 2 of the License, or 171da177e4SLinus Torvalds ** (at your option) any later version. 181da177e4SLinus Torvalds */ 191da177e4SLinus Torvalds #include <linux/types.h> 201da177e4SLinus Torvalds #include <linux/spinlock.h> 211da177e4SLinus Torvalds #include <linux/slab.h> 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds #include <linux/kernel.h> 241da177e4SLinus Torvalds #include <linux/module.h> 251da177e4SLinus Torvalds #include <linux/sched.h> 261da177e4SLinus Torvalds #include <linux/init.h> 271da177e4SLinus Torvalds #include <linux/interrupt.h> 281da177e4SLinus Torvalds #include <linux/smp.h> 291da177e4SLinus Torvalds #include <linux/kernel_stat.h> 301da177e4SLinus Torvalds #include <linux/mm.h> 311da177e4SLinus Torvalds #include <linux/delay.h> 321da177e4SLinus Torvalds #include <linux/bitops.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #include <asm/system.h> 351da177e4SLinus Torvalds #include <asm/atomic.h> 361da177e4SLinus Torvalds #include <asm/current.h> 371da177e4SLinus Torvalds #include <asm/delay.h> 381b2425e3SMatthew Wilcox #include <asm/tlbflush.h> 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds #include <asm/io.h> 411da177e4SLinus Torvalds #include <asm/irq.h> /* for CPU_IRQ_REGION and friends */ 421da177e4SLinus Torvalds #include <asm/mmu_context.h> 431da177e4SLinus Torvalds #include <asm/page.h> 441da177e4SLinus Torvalds #include <asm/pgtable.h> 451da177e4SLinus Torvalds #include <asm/pgalloc.h> 461da177e4SLinus Torvalds #include <asm/processor.h> 471da177e4SLinus Torvalds #include <asm/ptrace.h> 481da177e4SLinus Torvalds #include <asm/unistd.h> 491da177e4SLinus Torvalds #include <asm/cacheflush.h> 501da177e4SLinus Torvalds 515492a0f0SKyle McMartin #undef DEBUG_SMP 525492a0f0SKyle McMartin #ifdef DEBUG_SMP 535492a0f0SKyle McMartin static int smp_debug_lvl = 0; 545492a0f0SKyle McMartin #define smp_debug(lvl, printargs...) \ 555492a0f0SKyle McMartin if (lvl >= smp_debug_lvl) \ 565492a0f0SKyle McMartin printk(printargs); 575492a0f0SKyle McMartin #else 585492a0f0SKyle McMartin #define smp_debug(lvl, ...) 595492a0f0SKyle McMartin #endif /* DEBUG_SMP */ 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds DEFINE_SPINLOCK(smp_lock); 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds volatile struct task_struct *smp_init_current_idle_task; 641da177e4SLinus Torvalds 658039de10SHelge Deller static volatile int cpu_now_booting __read_mostly = 0; /* track which CPU is booting */ 661da177e4SLinus Torvalds 678039de10SHelge Deller static int parisc_max_cpus __read_mostly = 1; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds /* online cpus are ones that we've managed to bring up completely 701da177e4SLinus Torvalds * possible cpus are all valid cpu 711da177e4SLinus Torvalds * present cpus are all detected cpu 721da177e4SLinus Torvalds * 731da177e4SLinus Torvalds * On startup we bring up the "possible" cpus. Since we discover 741da177e4SLinus Torvalds * CPUs later, we add them as hotplug, so the possible cpu mask is 751da177e4SLinus Torvalds * empty in the beginning. 761da177e4SLinus Torvalds */ 771da177e4SLinus Torvalds 788039de10SHelge Deller cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE; /* Bitmap of online CPUs */ 798039de10SHelge Deller cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL; /* Bitmap of Present CPUs */ 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds EXPORT_SYMBOL(cpu_online_map); 821da177e4SLinus Torvalds EXPORT_SYMBOL(cpu_possible_map); 831da177e4SLinus Torvalds 843c97b5e9SKyle McMartin DEFINE_PER_CPU(spinlock_t, ipi_lock) = SPIN_LOCK_UNLOCKED; 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds struct smp_call_struct { 871da177e4SLinus Torvalds void (*func) (void *info); 881da177e4SLinus Torvalds void *info; 891da177e4SLinus Torvalds long wait; 901da177e4SLinus Torvalds atomic_t unstarted_count; 911da177e4SLinus Torvalds atomic_t unfinished_count; 921da177e4SLinus Torvalds }; 931da177e4SLinus Torvalds static volatile struct smp_call_struct *smp_call_function_data; 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds enum ipi_message_type { 961da177e4SLinus Torvalds IPI_NOP=0, 971da177e4SLinus Torvalds IPI_RESCHEDULE=1, 981da177e4SLinus Torvalds IPI_CALL_FUNC, 991da177e4SLinus Torvalds IPI_CPU_START, 1001da177e4SLinus Torvalds IPI_CPU_STOP, 1011da177e4SLinus Torvalds IPI_CPU_TEST 1021da177e4SLinus Torvalds }; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds /********** SMP inter processor interrupt and communication routines */ 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds #undef PER_CPU_IRQ_REGION 1081da177e4SLinus Torvalds #ifdef PER_CPU_IRQ_REGION 1091da177e4SLinus Torvalds /* XXX REVISIT Ignore for now. 1101da177e4SLinus Torvalds ** *May* need this "hook" to register IPI handler 1111da177e4SLinus Torvalds ** once we have perCPU ExtIntr switch tables. 1121da177e4SLinus Torvalds */ 1131da177e4SLinus Torvalds static void 1141da177e4SLinus Torvalds ipi_init(int cpuid) 1151da177e4SLinus Torvalds { 1161da177e4SLinus Torvalds #error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds if(cpu_online(cpuid) ) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds switch_to_idle_task(current); 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds return; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds #endif 1261da177e4SLinus Torvalds 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* 1291da177e4SLinus Torvalds ** Yoink this CPU from the runnable list... 1301da177e4SLinus Torvalds ** 1311da177e4SLinus Torvalds */ 1321da177e4SLinus Torvalds static void 1331da177e4SLinus Torvalds halt_processor(void) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds /* REVISIT : redirect I/O Interrupts to another CPU? */ 1361da177e4SLinus Torvalds /* REVISIT : does PM *know* this CPU isn't available? */ 1371da177e4SLinus Torvalds cpu_clear(smp_processor_id(), cpu_online_map); 1381da177e4SLinus Torvalds local_irq_disable(); 1391da177e4SLinus Torvalds for (;;) 1401da177e4SLinus Torvalds ; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds irqreturn_t 145c7753f18SMatthew Wilcox ipi_interrupt(int irq, void *dev_id) 1461da177e4SLinus Torvalds { 1471da177e4SLinus Torvalds int this_cpu = smp_processor_id(); 1481da177e4SLinus Torvalds struct cpuinfo_parisc *p = &cpu_data[this_cpu]; 1491da177e4SLinus Torvalds unsigned long ops; 1501da177e4SLinus Torvalds unsigned long flags; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds /* Count this now; we may make a call that never returns. */ 1531da177e4SLinus Torvalds p->ipi_count++; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds mb(); /* Order interrupt and bit testing. */ 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds for (;;) { 1583c97b5e9SKyle McMartin spinlock_t *lock = &per_cpu(ipi_lock, this_cpu); 1593c97b5e9SKyle McMartin spin_lock_irqsave(lock, flags); 1601da177e4SLinus Torvalds ops = p->pending_ipi; 1611da177e4SLinus Torvalds p->pending_ipi = 0; 1623c97b5e9SKyle McMartin spin_unlock_irqrestore(lock, flags); 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds mb(); /* Order bit clearing and data access. */ 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds if (!ops) 1671da177e4SLinus Torvalds break; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds while (ops) { 1701da177e4SLinus Torvalds unsigned long which = ffz(~ops); 1711da177e4SLinus Torvalds 172d911aed8SJames Bottomley ops &= ~(1 << which); 173d911aed8SJames Bottomley 1741da177e4SLinus Torvalds switch (which) { 175d911aed8SJames Bottomley case IPI_NOP: 1765492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu); 177d911aed8SJames Bottomley break; 178d911aed8SJames Bottomley 1791da177e4SLinus Torvalds case IPI_RESCHEDULE: 1805492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu); 1811da177e4SLinus Torvalds /* 1821da177e4SLinus Torvalds * Reschedule callback. Everything to be 1831da177e4SLinus Torvalds * done is done by the interrupt return path. 1841da177e4SLinus Torvalds */ 1851da177e4SLinus Torvalds break; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds case IPI_CALL_FUNC: 1885492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu); 1891da177e4SLinus Torvalds { 1901da177e4SLinus Torvalds volatile struct smp_call_struct *data; 1911da177e4SLinus Torvalds void (*func)(void *info); 1921da177e4SLinus Torvalds void *info; 1931da177e4SLinus Torvalds int wait; 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvalds data = smp_call_function_data; 1961da177e4SLinus Torvalds func = data->func; 1971da177e4SLinus Torvalds info = data->info; 1981da177e4SLinus Torvalds wait = data->wait; 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds mb(); 2011da177e4SLinus Torvalds atomic_dec ((atomic_t *)&data->unstarted_count); 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds /* At this point, *data can't 2041da177e4SLinus Torvalds * be relied upon. 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds (*func)(info); 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds /* Notify the sending CPU that the 2101da177e4SLinus Torvalds * task is done. 2111da177e4SLinus Torvalds */ 2121da177e4SLinus Torvalds mb(); 2131da177e4SLinus Torvalds if (wait) 2141da177e4SLinus Torvalds atomic_dec ((atomic_t *)&data->unfinished_count); 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds break; 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds case IPI_CPU_START: 2195492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu); 2201da177e4SLinus Torvalds break; 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds case IPI_CPU_STOP: 2235492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu); 2241da177e4SLinus Torvalds halt_processor(); 2251da177e4SLinus Torvalds break; 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds case IPI_CPU_TEST: 2285492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu); 2291da177e4SLinus Torvalds break; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds default: 2321da177e4SLinus Torvalds printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n", 2331da177e4SLinus Torvalds this_cpu, which); 2341da177e4SLinus Torvalds return IRQ_NONE; 2351da177e4SLinus Torvalds } /* Switch */ 2367085689eSJames Bottomley /* let in any pending interrupts */ 2377085689eSJames Bottomley local_irq_enable(); 2387085689eSJames Bottomley local_irq_disable(); 2391da177e4SLinus Torvalds } /* while (ops) */ 2401da177e4SLinus Torvalds } 2411da177e4SLinus Torvalds return IRQ_HANDLED; 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds static inline void 2461da177e4SLinus Torvalds ipi_send(int cpu, enum ipi_message_type op) 2471da177e4SLinus Torvalds { 2481da177e4SLinus Torvalds struct cpuinfo_parisc *p = &cpu_data[cpu]; 2493c97b5e9SKyle McMartin spinlock_t *lock = &per_cpu(ipi_lock, cpu); 2501da177e4SLinus Torvalds unsigned long flags; 2511da177e4SLinus Torvalds 2523c97b5e9SKyle McMartin spin_lock_irqsave(lock, flags); 2531da177e4SLinus Torvalds p->pending_ipi |= 1 << op; 2541da177e4SLinus Torvalds gsc_writel(IPI_IRQ - CPU_IRQ_BASE, cpu_data[cpu].hpa); 2553c97b5e9SKyle McMartin spin_unlock_irqrestore(lock, flags); 2561da177e4SLinus Torvalds } 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds 2591da177e4SLinus Torvalds static inline void 2601da177e4SLinus Torvalds send_IPI_single(int dest_cpu, enum ipi_message_type op) 2611da177e4SLinus Torvalds { 2621da177e4SLinus Torvalds if (dest_cpu == NO_PROC_ID) { 2631da177e4SLinus Torvalds BUG(); 2641da177e4SLinus Torvalds return; 2651da177e4SLinus Torvalds } 2661da177e4SLinus Torvalds 2671da177e4SLinus Torvalds ipi_send(dest_cpu, op); 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds static inline void 2711da177e4SLinus Torvalds send_IPI_allbutself(enum ipi_message_type op) 2721da177e4SLinus Torvalds { 2731da177e4SLinus Torvalds int i; 2741da177e4SLinus Torvalds 275394e3902SAndrew Morton for_each_online_cpu(i) { 276394e3902SAndrew Morton if (i != smp_processor_id()) 2771da177e4SLinus Torvalds send_IPI_single(i, op); 2781da177e4SLinus Torvalds } 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds inline void 2831da177e4SLinus Torvalds smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); } 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds static inline void 2861da177e4SLinus Torvalds smp_send_start(void) { send_IPI_allbutself(IPI_CPU_START); } 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds void 2891da177e4SLinus Torvalds smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); } 2901da177e4SLinus Torvalds 291d911aed8SJames Bottomley void 292d911aed8SJames Bottomley smp_send_all_nop(void) 293d911aed8SJames Bottomley { 294d911aed8SJames Bottomley send_IPI_allbutself(IPI_NOP); 295d911aed8SJames Bottomley } 296d911aed8SJames Bottomley 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds /** 2991da177e4SLinus Torvalds * Run a function on all other CPUs. 3001da177e4SLinus Torvalds * <func> The function to run. This must be fast and non-blocking. 3011da177e4SLinus Torvalds * <info> An arbitrary pointer to pass to the function. 3021da177e4SLinus Torvalds * <retry> If true, keep retrying until ready. 3031da177e4SLinus Torvalds * <wait> If true, wait until function has completed on other CPUs. 3041da177e4SLinus Torvalds * [RETURNS] 0 on success, else a negative status code. 3051da177e4SLinus Torvalds * 3061da177e4SLinus Torvalds * Does not return until remote CPUs are nearly ready to execute <func> 3071da177e4SLinus Torvalds * or have executed. 3081da177e4SLinus Torvalds */ 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds int 3111da177e4SLinus Torvalds smp_call_function (void (*func) (void *info), void *info, int retry, int wait) 3121da177e4SLinus Torvalds { 3131da177e4SLinus Torvalds struct smp_call_struct data; 3141da177e4SLinus Torvalds unsigned long timeout; 3151da177e4SLinus Torvalds static DEFINE_SPINLOCK(lock); 3161da177e4SLinus Torvalds int retries = 0; 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds if (num_online_cpus() < 2) 3191da177e4SLinus Torvalds return 0; 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds /* Can deadlock when called with interrupts disabled */ 3221da177e4SLinus Torvalds WARN_ON(irqs_disabled()); 3239a8b4584SJames Bottomley 3249a8b4584SJames Bottomley /* can also deadlock if IPIs are disabled */ 3259a8b4584SJames Bottomley WARN_ON((get_eiem() & (1UL<<(CPU_IRQ_MAX - IPI_IRQ))) == 0); 3269a8b4584SJames Bottomley 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds data.func = func; 3291da177e4SLinus Torvalds data.info = info; 3301da177e4SLinus Torvalds data.wait = wait; 3311da177e4SLinus Torvalds atomic_set(&data.unstarted_count, num_online_cpus() - 1); 3321da177e4SLinus Torvalds atomic_set(&data.unfinished_count, num_online_cpus() - 1); 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds if (retry) { 3351da177e4SLinus Torvalds spin_lock (&lock); 3361da177e4SLinus Torvalds while (smp_call_function_data != 0) 3371da177e4SLinus Torvalds barrier(); 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds else { 3401da177e4SLinus Torvalds spin_lock (&lock); 3411da177e4SLinus Torvalds if (smp_call_function_data) { 3421da177e4SLinus Torvalds spin_unlock (&lock); 3431da177e4SLinus Torvalds return -EBUSY; 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds smp_call_function_data = &data; 3481da177e4SLinus Torvalds spin_unlock (&lock); 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds /* Send a message to all other CPUs and wait for them to respond */ 3511da177e4SLinus Torvalds send_IPI_allbutself(IPI_CALL_FUNC); 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds retry: 3541da177e4SLinus Torvalds /* Wait for response */ 3551da177e4SLinus Torvalds timeout = jiffies + HZ; 3561da177e4SLinus Torvalds while ( (atomic_read (&data.unstarted_count) > 0) && 3571da177e4SLinus Torvalds time_before (jiffies, timeout) ) 3581da177e4SLinus Torvalds barrier (); 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds if (atomic_read (&data.unstarted_count) > 0) { 3611da177e4SLinus Torvalds printk(KERN_CRIT "SMP CALL FUNCTION TIMED OUT! (cpu=%d), try %d\n", 3621da177e4SLinus Torvalds smp_processor_id(), ++retries); 3631da177e4SLinus Torvalds goto retry; 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds /* We either got one or timed out. Release the lock */ 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds mb(); 3681da177e4SLinus Torvalds smp_call_function_data = NULL; 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds while (wait && atomic_read (&data.unfinished_count) > 0) 3711da177e4SLinus Torvalds barrier (); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds return 0; 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds EXPORT_SYMBOL(smp_call_function); 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds /* 3791da177e4SLinus Torvalds * Flush all other CPU's tlb and then mine. Do this with on_each_cpu() 3801da177e4SLinus Torvalds * as we want to ensure all TLB's flushed before proceeding. 3811da177e4SLinus Torvalds */ 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds void 3841da177e4SLinus Torvalds smp_flush_tlb_all(void) 3851da177e4SLinus Torvalds { 3861b2425e3SMatthew Wilcox on_each_cpu(flush_tlb_all_local, NULL, 1, 1); 3871da177e4SLinus Torvalds } 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds /* 3901da177e4SLinus Torvalds * Called by secondaries to update state and initialize CPU registers. 3911da177e4SLinus Torvalds */ 3921da177e4SLinus Torvalds static void __init 3931da177e4SLinus Torvalds smp_cpu_init(int cpunum) 3941da177e4SLinus Torvalds { 39556f335c8SGrant Grundler extern int init_per_cpu(int); /* arch/parisc/kernel/processor.c */ 3961da177e4SLinus Torvalds extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */ 39756f335c8SGrant Grundler extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */ 3981da177e4SLinus Torvalds 3991da177e4SLinus Torvalds /* Set modes and Enable floating point coprocessor */ 4001da177e4SLinus Torvalds (void) init_per_cpu(cpunum); 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds disable_sr_hashing(); 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds mb(); 4051da177e4SLinus Torvalds 4061da177e4SLinus Torvalds /* Well, support 2.4 linux scheme as well. */ 4071da177e4SLinus Torvalds if (cpu_test_and_set(cpunum, cpu_online_map)) 4081da177e4SLinus Torvalds { 4091da177e4SLinus Torvalds extern void machine_halt(void); /* arch/parisc.../process.c */ 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum); 4121da177e4SLinus Torvalds machine_halt(); 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* Initialise the idle task for this CPU */ 4161da177e4SLinus Torvalds atomic_inc(&init_mm.mm_count); 4171da177e4SLinus Torvalds current->active_mm = &init_mm; 4181da177e4SLinus Torvalds if(current->mm) 4191da177e4SLinus Torvalds BUG(); 4201da177e4SLinus Torvalds enter_lazy_tlb(&init_mm, current); 4211da177e4SLinus Torvalds 4227022672eSSimon Arlott init_IRQ(); /* make sure no IRQs are enabled or pending */ 42356f335c8SGrant Grundler start_cpu_itimer(); 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds /* 4281da177e4SLinus Torvalds * Slaves start using C here. Indirectly called from smp_slave_stext. 4291da177e4SLinus Torvalds * Do what start_kernel() and main() do for boot strap processor (aka monarch) 4301da177e4SLinus Torvalds */ 4311da177e4SLinus Torvalds void __init smp_callin(void) 4321da177e4SLinus Torvalds { 4331da177e4SLinus Torvalds int slave_id = cpu_now_booting; 4341da177e4SLinus Torvalds #if 0 4351da177e4SLinus Torvalds void *istack; 4361da177e4SLinus Torvalds #endif 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds smp_cpu_init(slave_id); 4395bfb5d69SNick Piggin preempt_disable(); 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds #if 0 /* NOT WORKING YET - see entry.S */ 4421da177e4SLinus Torvalds istack = (void *)__get_free_pages(GFP_KERNEL,ISTACK_ORDER); 4431da177e4SLinus Torvalds if (istack == NULL) { 4441da177e4SLinus Torvalds printk(KERN_CRIT "Failed to allocate interrupt stack for cpu %d\n",slave_id); 4451da177e4SLinus Torvalds BUG(); 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds mtctl(istack,31); 4481da177e4SLinus Torvalds #endif 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds flush_cache_all_local(); /* start with known state */ 4511b2425e3SMatthew Wilcox flush_tlb_all_local(NULL); 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds local_irq_enable(); /* Interrupts have been off until now */ 4541da177e4SLinus Torvalds 4551da177e4SLinus Torvalds cpu_idle(); /* Wait for timer to schedule some work */ 4561da177e4SLinus Torvalds 4571da177e4SLinus Torvalds /* NOTREACHED */ 4581da177e4SLinus Torvalds panic("smp_callin() AAAAaaaaahhhh....\n"); 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* 4621da177e4SLinus Torvalds * Bring one cpu online. 4631da177e4SLinus Torvalds */ 4641da177e4SLinus Torvalds int __init smp_boot_one_cpu(int cpuid) 4651da177e4SLinus Torvalds { 4661da177e4SLinus Torvalds struct task_struct *idle; 4671da177e4SLinus Torvalds long timeout; 4681da177e4SLinus Torvalds 4691da177e4SLinus Torvalds /* 4701da177e4SLinus Torvalds * Create an idle task for this CPU. Note the address wed* give 4711da177e4SLinus Torvalds * to kernel_thread is irrelevant -- it's going to start 4721da177e4SLinus Torvalds * where OS_BOOT_RENDEVZ vector in SAL says to start. But 4731da177e4SLinus Torvalds * this gets all the other task-y sort of data structures set 4741da177e4SLinus Torvalds * up like we wish. We need to pull the just created idle task 4751da177e4SLinus Torvalds * off the run queue and stuff it into the init_tasks[] array. 4761da177e4SLinus Torvalds * Sheesh . . . 4771da177e4SLinus Torvalds */ 4781da177e4SLinus Torvalds 4791da177e4SLinus Torvalds idle = fork_idle(cpuid); 4801da177e4SLinus Torvalds if (IS_ERR(idle)) 4811da177e4SLinus Torvalds panic("SMP: fork failed for CPU:%d", cpuid); 4821da177e4SLinus Torvalds 48340f1f0deSAl Viro task_thread_info(idle)->cpu = cpuid; 4841da177e4SLinus Torvalds 4851da177e4SLinus Torvalds /* Let _start know what logical CPU we're booting 4861da177e4SLinus Torvalds ** (offset into init_tasks[],cpu_data[]) 4871da177e4SLinus Torvalds */ 4881da177e4SLinus Torvalds cpu_now_booting = cpuid; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* 4911da177e4SLinus Torvalds ** boot strap code needs to know the task address since 4921da177e4SLinus Torvalds ** it also contains the process stack. 4931da177e4SLinus Torvalds */ 4941da177e4SLinus Torvalds smp_init_current_idle_task = idle ; 4951da177e4SLinus Torvalds mb(); 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds printk("Releasing cpu %d now, hpa=%lx\n", cpuid, cpu_data[cpuid].hpa); 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds /* 5001da177e4SLinus Torvalds ** This gets PDC to release the CPU from a very tight loop. 5011da177e4SLinus Torvalds ** 5021da177e4SLinus Torvalds ** From the PA-RISC 2.0 Firmware Architecture Reference Specification: 5031da177e4SLinus Torvalds ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which 5041da177e4SLinus Torvalds ** is executed after receiving the rendezvous signal (an interrupt to 5051da177e4SLinus Torvalds ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the 5061da177e4SLinus Torvalds ** contents of memory are valid." 5071da177e4SLinus Torvalds */ 5081da177e4SLinus Torvalds gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, cpu_data[cpuid].hpa); 5091da177e4SLinus Torvalds mb(); 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds /* 5121da177e4SLinus Torvalds * OK, wait a bit for that CPU to finish staggering about. 5131da177e4SLinus Torvalds * Slave will set a bit when it reaches smp_cpu_init(). 5141da177e4SLinus Torvalds * Once the "monarch CPU" sees the bit change, it can move on. 5151da177e4SLinus Torvalds */ 5161da177e4SLinus Torvalds for (timeout = 0; timeout < 10000; timeout++) { 5171da177e4SLinus Torvalds if(cpu_online(cpuid)) { 5181da177e4SLinus Torvalds /* Which implies Slave has started up */ 5191da177e4SLinus Torvalds cpu_now_booting = 0; 5201da177e4SLinus Torvalds smp_init_current_idle_task = NULL; 5211da177e4SLinus Torvalds goto alive ; 5221da177e4SLinus Torvalds } 5231da177e4SLinus Torvalds udelay(100); 5241da177e4SLinus Torvalds barrier(); 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds put_task_struct(idle); 5281da177e4SLinus Torvalds idle = NULL; 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); 5311da177e4SLinus Torvalds return -1; 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds alive: 5341da177e4SLinus Torvalds /* Remember the Slave data */ 5355492a0f0SKyle McMartin smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n", 5361da177e4SLinus Torvalds cpuid, timeout * 100); 5371da177e4SLinus Torvalds return 0; 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds void __devinit smp_prepare_boot_cpu(void) 5411da177e4SLinus Torvalds { 5421da177e4SLinus Torvalds int bootstrap_processor=cpu_data[0].cpuid; /* CPU ID of BSP */ 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds /* Setup BSP mappings */ 5451da177e4SLinus Torvalds printk("SMP: bootstrap CPU ID is %d\n",bootstrap_processor); 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds cpu_set(bootstrap_processor, cpu_online_map); 5481da177e4SLinus Torvalds cpu_set(bootstrap_processor, cpu_present_map); 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds 5531da177e4SLinus Torvalds /* 5541da177e4SLinus Torvalds ** inventory.c:do_inventory() hasn't yet been run and thus we 5557022672eSSimon Arlott ** don't 'discover' the additional CPUs until later. 5561da177e4SLinus Torvalds */ 5571da177e4SLinus Torvalds void __init smp_prepare_cpus(unsigned int max_cpus) 5581da177e4SLinus Torvalds { 5591da177e4SLinus Torvalds cpus_clear(cpu_present_map); 5601da177e4SLinus Torvalds cpu_set(0, cpu_present_map); 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvalds parisc_max_cpus = max_cpus; 5631da177e4SLinus Torvalds if (!max_cpus) 5641da177e4SLinus Torvalds printk(KERN_INFO "SMP mode deactivated.\n"); 5651da177e4SLinus Torvalds } 5661da177e4SLinus Torvalds 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds void smp_cpus_done(unsigned int cpu_max) 5691da177e4SLinus Torvalds { 5701da177e4SLinus Torvalds return; 5711da177e4SLinus Torvalds } 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds 574b282b6f8SGautham R Shenoy int __cpuinit __cpu_up(unsigned int cpu) 5751da177e4SLinus Torvalds { 5761da177e4SLinus Torvalds if (cpu != 0 && cpu < parisc_max_cpus) 5771da177e4SLinus Torvalds smp_boot_one_cpu(cpu); 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds return cpu_online(cpu) ? 0 : -ENOSYS; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds #ifdef CONFIG_PROC_FS 5831da177e4SLinus Torvalds int __init 5841da177e4SLinus Torvalds setup_profiling_timer(unsigned int multiplier) 5851da177e4SLinus Torvalds { 5861da177e4SLinus Torvalds return -EINVAL; 5871da177e4SLinus Torvalds } 5881da177e4SLinus Torvalds #endif 589