1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * SMP boot-related support 41da177e4SLinus Torvalds * 582975115SDavid Mosberger-Tang * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co 61da177e4SLinus Torvalds * David Mosberger-Tang <davidm@hpl.hp.com> 7e927ecb0SSuresh Siddha * Copyright (C) 2001, 2004-2005 Intel Corp 8e927ecb0SSuresh Siddha * Rohit Seth <rohit.seth@intel.com> 9e927ecb0SSuresh Siddha * Suresh Siddha <suresh.b.siddha@intel.com> 10e927ecb0SSuresh Siddha * Gordon Jin <gordon.jin@intel.com> 11e927ecb0SSuresh Siddha * Ashok Raj <ashok.raj@intel.com> 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here. 141da177e4SLinus Torvalds * 01/04/27 David Mosberger <davidm@hpl.hp.com> Added ITC synching code. 151da177e4SLinus Torvalds * 02/07/31 David Mosberger <davidm@hpl.hp.com> Switch over to hotplug-CPU boot-sequence. 161da177e4SLinus Torvalds * smp_boot_cpus()/smp_commence() is replaced by 171da177e4SLinus Torvalds * smp_prepare_cpus()/__cpu_up()/smp_cpus_done(). 18b8d8b883SAshok Raj * 04/06/21 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support 19e927ecb0SSuresh Siddha * 04/12/26 Jin Gordon <gordon.jin@intel.com> 20e927ecb0SSuresh Siddha * 04/12/26 Rohit Seth <rohit.seth@intel.com> 21e927ecb0SSuresh Siddha * Add multi-threading and multi-core detection 22e927ecb0SSuresh Siddha * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com> 23e927ecb0SSuresh Siddha * Setup cpu_sibling_map and cpu_core_map 241da177e4SLinus Torvalds */ 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include <linux/module.h> 271da177e4SLinus Torvalds #include <linux/acpi.h> 2857c8a661SMike Rapoport #include <linux/memblock.h> 291da177e4SLinus Torvalds #include <linux/cpu.h> 301da177e4SLinus Torvalds #include <linux/delay.h> 311da177e4SLinus Torvalds #include <linux/init.h> 321da177e4SLinus Torvalds #include <linux/interrupt.h> 331da177e4SLinus Torvalds #include <linux/irq.h> 341da177e4SLinus Torvalds #include <linux/kernel.h> 351da177e4SLinus Torvalds #include <linux/kernel_stat.h> 361da177e4SLinus Torvalds #include <linux/mm.h> 371da177e4SLinus Torvalds #include <linux/notifier.h> 381da177e4SLinus Torvalds #include <linux/smp.h> 391da177e4SLinus Torvalds #include <linux/spinlock.h> 401da177e4SLinus Torvalds #include <linux/efi.h> 411da177e4SLinus Torvalds #include <linux/percpu.h> 421da177e4SLinus Torvalds #include <linux/bitops.h> 431da177e4SLinus Torvalds 4460063497SArun Sharma #include <linux/atomic.h> 451da177e4SLinus Torvalds #include <asm/cache.h> 461da177e4SLinus Torvalds #include <asm/current.h> 471da177e4SLinus Torvalds #include <asm/delay.h> 48*8ff059b8SArd Biesheuvel #include <asm/efi.h> 491da177e4SLinus Torvalds #include <asm/io.h> 501da177e4SLinus Torvalds #include <asm/irq.h> 511da177e4SLinus Torvalds #include <asm/mca.h> 521da177e4SLinus Torvalds #include <asm/page.h> 531da177e4SLinus Torvalds #include <asm/processor.h> 541da177e4SLinus Torvalds #include <asm/ptrace.h> 551da177e4SLinus Torvalds #include <asm/sal.h> 561da177e4SLinus Torvalds #include <asm/tlbflush.h> 571da177e4SLinus Torvalds #include <asm/unistd.h> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #define SMP_DEBUG 0 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #if SMP_DEBUG 621da177e4SLinus Torvalds #define Dprintk(x...) printk(x) 631da177e4SLinus Torvalds #else 641da177e4SLinus Torvalds #define Dprintk(x...) 651da177e4SLinus Torvalds #endif 661da177e4SLinus Torvalds 67b8d8b883SAshok Raj #ifdef CONFIG_HOTPLUG_CPU 68ff741906SAshok Raj #ifdef CONFIG_PERMIT_BSP_REMOVE 69ff741906SAshok Raj #define bsp_remove_ok 1 70ff741906SAshok Raj #else 71ff741906SAshok Raj #define bsp_remove_ok 0 72ff741906SAshok Raj #endif 73ff741906SAshok Raj 74b8d8b883SAshok Raj /* 75b8d8b883SAshok Raj * Global array allocated for NR_CPUS at boot time 76b8d8b883SAshok Raj */ 77b8d8b883SAshok Raj struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS]; 78b8d8b883SAshok Raj 79b8d8b883SAshok Raj /* 80b8d8b883SAshok Raj * start_ap in head.S uses this to store current booting cpu 81b8d8b883SAshok Raj * info. 82b8d8b883SAshok Raj */ 83b8d8b883SAshok Raj struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0]; 84b8d8b883SAshok Raj 85b8d8b883SAshok Raj #define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]); 86b8d8b883SAshok Raj 87b8d8b883SAshok Raj #else 88b8d8b883SAshok Raj #define set_brendez_area(x) 89b8d8b883SAshok Raj #endif 90b8d8b883SAshok Raj 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds /* 931da177e4SLinus Torvalds * ITC synchronization related stuff: 941da177e4SLinus Torvalds */ 95ff741906SAshok Raj #define MASTER (0) 961da177e4SLinus Torvalds #define SLAVE (SMP_CACHE_BYTES/8) 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds #define NUM_ROUNDS 64 /* magic value */ 991da177e4SLinus Torvalds #define NUM_ITERS 5 /* likewise */ 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds static DEFINE_SPINLOCK(itc_sync_lock); 1021da177e4SLinus Torvalds static volatile unsigned long go[SLAVE + 1]; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds #define DEBUG_ITC_SYNC 0 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds extern void start_ap (void); 1071da177e4SLinus Torvalds extern unsigned long ia64_iobase; 1081da177e4SLinus Torvalds 10936c8b586SIngo Molnar struct task_struct *task_for_booting_cpu; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds /* 1121da177e4SLinus Torvalds * State for each CPU 1131da177e4SLinus Torvalds */ 1141da177e4SLinus Torvalds DEFINE_PER_CPU(int, cpu_state); 1151da177e4SLinus Torvalds 116e927ecb0SSuresh Siddha cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; 11742aca483SRobin Holt EXPORT_SYMBOL(cpu_core_map); 118d5a7430dSMike Travis DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); 119d5a7430dSMike Travis EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); 120d5a7430dSMike Travis 121e927ecb0SSuresh Siddha int smp_num_siblings = 1; 122e927ecb0SSuresh Siddha 1231da177e4SLinus Torvalds /* which logical CPU number maps to which CPU (physical APIC ID) */ 1241da177e4SLinus Torvalds volatile int ia64_cpu_to_sapicid[NR_CPUS]; 1251da177e4SLinus Torvalds EXPORT_SYMBOL(ia64_cpu_to_sapicid); 1261da177e4SLinus Torvalds 1275eda7861SRusty Russell static cpumask_t cpu_callin_map; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds struct smp_boot_data smp_boot_data __initdata; 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds char __initdata no_int_routing; 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ 1361da177e4SLinus Torvalds 137ff741906SAshok Raj #ifdef CONFIG_FORCE_CPEI_RETARGET 138ff741906SAshok Raj #define CPEI_OVERRIDE_DEFAULT (1) 139ff741906SAshok Raj #else 140ff741906SAshok Raj #define CPEI_OVERRIDE_DEFAULT (0) 141ff741906SAshok Raj #endif 142ff741906SAshok Raj 143ff741906SAshok Raj unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; 144ff741906SAshok Raj 145ff741906SAshok Raj static int __init 146ff741906SAshok Raj cmdl_force_cpei(char *str) 147ff741906SAshok Raj { 148ff741906SAshok Raj int value=0; 149ff741906SAshok Raj 150ff741906SAshok Raj get_option (&str, &value); 151ff741906SAshok Raj force_cpei_retarget = value; 152ff741906SAshok Raj 153ff741906SAshok Raj return 1; 154ff741906SAshok Raj } 155ff741906SAshok Raj 156ff741906SAshok Raj __setup("force_cpei=", cmdl_force_cpei); 157ff741906SAshok Raj 1581da177e4SLinus Torvalds static int __init 1591da177e4SLinus Torvalds nointroute (char *str) 1601da177e4SLinus Torvalds { 1611da177e4SLinus Torvalds no_int_routing = 1; 1621da177e4SLinus Torvalds printk ("no_int_routing on\n"); 1631da177e4SLinus Torvalds return 1; 1641da177e4SLinus Torvalds } 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds __setup("nointroute", nointroute); 1671da177e4SLinus Torvalds 168ff741906SAshok Raj static void fix_b0_for_bsp(void) 169ff741906SAshok Raj { 170ff741906SAshok Raj #ifdef CONFIG_HOTPLUG_CPU 171ff741906SAshok Raj int cpuid; 172ff741906SAshok Raj static int fix_bsp_b0 = 1; 173ff741906SAshok Raj 174ff741906SAshok Raj cpuid = smp_processor_id(); 175ff741906SAshok Raj 176ff741906SAshok Raj /* 177ff741906SAshok Raj * Cache the b0 value on the first AP that comes up 178ff741906SAshok Raj */ 179ff741906SAshok Raj if (!(fix_bsp_b0 && cpuid)) 180ff741906SAshok Raj return; 181ff741906SAshok Raj 182ff741906SAshok Raj sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0]; 183ff741906SAshok Raj printk ("Fixed BSP b0 value from CPU %d\n", cpuid); 184ff741906SAshok Raj 185ff741906SAshok Raj fix_bsp_b0 = 0; 186ff741906SAshok Raj #endif 187ff741906SAshok Raj } 188ff741906SAshok Raj 1891da177e4SLinus Torvalds void 1901da177e4SLinus Torvalds sync_master (void *arg) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds unsigned long flags, i; 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds go[MASTER] = 0; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds local_irq_save(flags); 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) { 19982975115SDavid Mosberger-Tang while (!go[MASTER]) 20082975115SDavid Mosberger-Tang cpu_relax(); 2011da177e4SLinus Torvalds go[MASTER] = 0; 2021da177e4SLinus Torvalds go[SLAVE] = ia64_get_itc(); 2031da177e4SLinus Torvalds } 2041da177e4SLinus Torvalds } 2051da177e4SLinus Torvalds local_irq_restore(flags); 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds 2081da177e4SLinus Torvalds /* 2091da177e4SLinus Torvalds * Return the number of cycles by which our itc differs from the itc on the master 2101da177e4SLinus Torvalds * (time-keeper) CPU. A positive number indicates our itc is ahead of the master, 2111da177e4SLinus Torvalds * negative that it is behind. 2121da177e4SLinus Torvalds */ 2131da177e4SLinus Torvalds static inline long 2141da177e4SLinus Torvalds get_delta (long *rt, long *master) 2151da177e4SLinus Torvalds { 2161da177e4SLinus Torvalds unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; 2171da177e4SLinus Torvalds unsigned long tcenter, t0, t1, tm; 2181da177e4SLinus Torvalds long i; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds for (i = 0; i < NUM_ITERS; ++i) { 2211da177e4SLinus Torvalds t0 = ia64_get_itc(); 2221da177e4SLinus Torvalds go[MASTER] = 1; 22382975115SDavid Mosberger-Tang while (!(tm = go[SLAVE])) 22482975115SDavid Mosberger-Tang cpu_relax(); 2251da177e4SLinus Torvalds go[SLAVE] = 0; 2261da177e4SLinus Torvalds t1 = ia64_get_itc(); 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds if (t1 - t0 < best_t1 - best_t0) 2291da177e4SLinus Torvalds best_t0 = t0, best_t1 = t1, best_tm = tm; 2301da177e4SLinus Torvalds } 2311da177e4SLinus Torvalds 2321da177e4SLinus Torvalds *rt = best_t1 - best_t0; 2331da177e4SLinus Torvalds *master = best_tm - best_t0; 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* average best_t0 and best_t1 without overflow: */ 2361da177e4SLinus Torvalds tcenter = (best_t0/2 + best_t1/2); 2371da177e4SLinus Torvalds if (best_t0 % 2 + best_t1 % 2 == 2) 2381da177e4SLinus Torvalds ++tcenter; 2391da177e4SLinus Torvalds return tcenter - best_tm; 2401da177e4SLinus Torvalds } 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds /* 2431da177e4SLinus Torvalds * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU 2441da177e4SLinus Torvalds * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of 2451da177e4SLinus Torvalds * unaccounted-for errors (such as getting a machine check in the middle of a calibration 2461da177e4SLinus Torvalds * step). The basic idea is for the slave to ask the master what itc value it has and to 2471da177e4SLinus Torvalds * read its own itc before and after the master responds. Each iteration gives us three 2481da177e4SLinus Torvalds * timestamps: 2491da177e4SLinus Torvalds * 2501da177e4SLinus Torvalds * slave master 2511da177e4SLinus Torvalds * 2521da177e4SLinus Torvalds * t0 ---\ 2531da177e4SLinus Torvalds * ---\ 2541da177e4SLinus Torvalds * ---> 2551da177e4SLinus Torvalds * tm 2561da177e4SLinus Torvalds * /--- 2571da177e4SLinus Torvalds * /--- 2581da177e4SLinus Torvalds * t1 <--- 2591da177e4SLinus Torvalds * 2601da177e4SLinus Torvalds * 2611da177e4SLinus Torvalds * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0 2621da177e4SLinus Torvalds * and t1. If we achieve this, the clocks are synchronized provided the interconnect 2631da177e4SLinus Torvalds * between the slave and the master is symmetric. Even if the interconnect were 2641da177e4SLinus Torvalds * asymmetric, we would still know that the synchronization error is smaller than the 2651da177e4SLinus Torvalds * roundtrip latency (t0 - t1). 2661da177e4SLinus Torvalds * 2671da177e4SLinus Torvalds * When the interconnect is quiet and symmetric, this lets us synchronize the itc to 2681da177e4SLinus Torvalds * within one or two cycles. However, we can only *guarantee* that the synchronization is 2691da177e4SLinus Torvalds * accurate to within a round-trip time, which is typically in the range of several 2701da177e4SLinus Torvalds * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually 2711da177e4SLinus Torvalds * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better 2721da177e4SLinus Torvalds * than half a micro second or so. 2731da177e4SLinus Torvalds */ 2741da177e4SLinus Torvalds void 2751da177e4SLinus Torvalds ia64_sync_itc (unsigned int master) 2761da177e4SLinus Torvalds { 2771da177e4SLinus Torvalds long i, delta, adj, adjust_latency = 0, done = 0; 2781da177e4SLinus Torvalds unsigned long flags, rt, master_time_stamp, bound; 2791da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 2801da177e4SLinus Torvalds struct { 2811da177e4SLinus Torvalds long rt; /* roundtrip time */ 2821da177e4SLinus Torvalds long master; /* master's timestamp */ 2831da177e4SLinus Torvalds long diff; /* difference between midpoint and master's timestamp */ 2841da177e4SLinus Torvalds long lat; /* estimate of itc adjustment latency */ 2851da177e4SLinus Torvalds } t[NUM_ROUNDS]; 2861da177e4SLinus Torvalds #endif 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds /* 2891da177e4SLinus Torvalds * Make sure local timer ticks are disabled while we sync. If 2901da177e4SLinus Torvalds * they were enabled, we'd have to worry about nasty issues 2911da177e4SLinus Torvalds * like setting the ITC ahead of (or a long time before) the 2921da177e4SLinus Torvalds * next scheduled tick. 2931da177e4SLinus Torvalds */ 2941da177e4SLinus Torvalds BUG_ON((ia64_get_itv() & (1 << 16)) == 0); 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds go[MASTER] = 1; 2971da177e4SLinus Torvalds 2988691e5a8SJens Axboe if (smp_call_function_single(master, sync_master, NULL, 0) < 0) { 2991da177e4SLinus Torvalds printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); 3001da177e4SLinus Torvalds return; 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 30382975115SDavid Mosberger-Tang while (go[MASTER]) 30482975115SDavid Mosberger-Tang cpu_relax(); /* wait for master to be ready */ 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds spin_lock_irqsave(&itc_sync_lock, flags); 3071da177e4SLinus Torvalds { 3081da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS; ++i) { 3091da177e4SLinus Torvalds delta = get_delta(&rt, &master_time_stamp); 3101da177e4SLinus Torvalds if (delta == 0) { 3111da177e4SLinus Torvalds done = 1; /* let's lock on to this... */ 3121da177e4SLinus Torvalds bound = rt; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds if (!done) { 3161da177e4SLinus Torvalds if (i > 0) { 3171da177e4SLinus Torvalds adjust_latency += -delta; 3181da177e4SLinus Torvalds adj = -delta + adjust_latency/4; 3191da177e4SLinus Torvalds } else 3201da177e4SLinus Torvalds adj = -delta; 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds ia64_set_itc(ia64_get_itc() + adj); 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3251da177e4SLinus Torvalds t[i].rt = rt; 3261da177e4SLinus Torvalds t[i].master = master_time_stamp; 3271da177e4SLinus Torvalds t[i].diff = delta; 3281da177e4SLinus Torvalds t[i].lat = adjust_latency/4; 3291da177e4SLinus Torvalds #endif 3301da177e4SLinus Torvalds } 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds spin_unlock_irqrestore(&itc_sync_lock, flags); 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3351da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS; ++i) 3361da177e4SLinus Torvalds printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", 3371da177e4SLinus Torvalds t[i].rt, t[i].master, t[i].diff, t[i].lat); 3381da177e4SLinus Torvalds #endif 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, " 3411da177e4SLinus Torvalds "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt); 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* 3451da177e4SLinus Torvalds * Ideally sets up per-cpu profiling hooks. Doesn't do much now... 3461da177e4SLinus Torvalds */ 3475b5e76e9SGreg Kroah-Hartman static inline void smp_setup_percpu_timer(void) 3481da177e4SLinus Torvalds { 3491da177e4SLinus Torvalds } 3501da177e4SLinus Torvalds 351ccce9bb8SPaul Gortmaker static void 3521da177e4SLinus Torvalds smp_callin (void) 3531da177e4SLinus Torvalds { 354ff741906SAshok Raj int cpuid, phys_id, itc_master; 355ead6caaeSJack Steiner struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; 3561da177e4SLinus Torvalds extern void ia64_init_itm(void); 357ff741906SAshok Raj extern volatile int time_keeper_id; 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds cpuid = smp_processor_id(); 3601da177e4SLinus Torvalds phys_id = hard_smp_processor_id(); 361ff741906SAshok Raj itc_master = time_keeper_id; 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds if (cpu_online(cpuid)) { 3641da177e4SLinus Torvalds printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n", 3651da177e4SLinus Torvalds phys_id, cpuid); 3661da177e4SLinus Torvalds BUG(); 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 369ff741906SAshok Raj fix_b0_for_bsp(); 370ff741906SAshok Raj 3713bccd996SLee Schermerhorn /* 3723bccd996SLee Schermerhorn * numa_node_id() works after this. 3733bccd996SLee Schermerhorn */ 3743bccd996SLee Schermerhorn set_numa_node(cpu_to_node_map[cpuid]); 375fd1197f1SLee Schermerhorn set_numa_mem(local_memory_node(cpu_to_node_map[cpuid])); 3763bccd996SLee Schermerhorn 377e1b30a39SYasuaki Ishimatsu spin_lock(&vector_lock); 378e1b30a39SYasuaki Ishimatsu /* Setup the per cpu irq handling data structures */ 379e1b30a39SYasuaki Ishimatsu __setup_vector_irq(cpuid); 380e545a614SManfred Spraul notify_cpu_starting(cpuid); 3817d7f9848SSrivatsa S. Bhat set_cpu_online(cpuid, true); 382a9fa06c2SShaohua Li per_cpu(cpu_state, cpuid) = CPU_ONLINE; 383e1b30a39SYasuaki Ishimatsu spin_unlock(&vector_lock); 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds smp_setup_percpu_timer(); 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds local_irq_enable(); 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) { 3921da177e4SLinus Torvalds /* 3931da177e4SLinus Torvalds * Synchronize the ITC with the BP. Need to do this after irqs are 3941da177e4SLinus Torvalds * enabled because ia64_sync_itc() calls smp_call_function_single(), which 3951da177e4SLinus Torvalds * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls 3961da177e4SLinus Torvalds * local_bh_enable(), which bugs out if irqs are not enabled... 3971da177e4SLinus Torvalds */ 398ff741906SAshok Raj Dprintk("Going to syncup ITC with ITC Master.\n"); 399ff741906SAshok Raj ia64_sync_itc(itc_master); 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* 4031da177e4SLinus Torvalds * Get our bogomips. 4041da177e4SLinus Torvalds */ 4051da177e4SLinus Torvalds ia64_init_itm(); 406ead6caaeSJack Steiner 407ead6caaeSJack Steiner /* 408ead6caaeSJack Steiner * Delay calibration can be skipped if new processor is identical to the 409ead6caaeSJack Steiner * previous processor. 410ead6caaeSJack Steiner */ 411ead6caaeSJack Steiner last_cpuinfo = cpu_data(cpuid - 1); 412ead6caaeSJack Steiner this_cpuinfo = local_cpu_data; 413ead6caaeSJack Steiner if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq || 414ead6caaeSJack Steiner last_cpuinfo->proc_freq != this_cpuinfo->proc_freq || 415ead6caaeSJack Steiner last_cpuinfo->features != this_cpuinfo->features || 416ead6caaeSJack Steiner last_cpuinfo->revision != this_cpuinfo->revision || 417ead6caaeSJack Steiner last_cpuinfo->family != this_cpuinfo->family || 418ead6caaeSJack Steiner last_cpuinfo->archrev != this_cpuinfo->archrev || 419ead6caaeSJack Steiner last_cpuinfo->model != this_cpuinfo->model) 4201da177e4SLinus Torvalds calibrate_delay(); 4211da177e4SLinus Torvalds local_cpu_data->loops_per_jiffy = loops_per_jiffy; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* 4241da177e4SLinus Torvalds * Allow the master to continue. 4251da177e4SLinus Torvalds */ 4265d2068daSRusty Russell cpumask_set_cpu(cpuid, &cpu_callin_map); 4271da177e4SLinus Torvalds Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid); 4281da177e4SLinus Torvalds } 4291da177e4SLinus Torvalds 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds /* 4321da177e4SLinus Torvalds * Activate a secondary processor. head.S calls this. 4331da177e4SLinus Torvalds */ 434ccce9bb8SPaul Gortmaker int 4351da177e4SLinus Torvalds start_secondary (void *unused) 4361da177e4SLinus Torvalds { 4371da177e4SLinus Torvalds /* Early console may use I/O ports */ 4381da177e4SLinus Torvalds ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); 43910617bbeSTony Luck #ifndef CONFIG_PRINTK_TIME 4401da177e4SLinus Torvalds Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); 44110617bbeSTony Luck #endif 4421da177e4SLinus Torvalds efi_map_pal_code(); 4431da177e4SLinus Torvalds cpu_init(); 4445bfb5d69SNick Piggin preempt_disable(); 4451da177e4SLinus Torvalds smp_callin(); 4461da177e4SLinus Torvalds 447fc6d73d6SThomas Gleixner cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); 4481da177e4SLinus Torvalds return 0; 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 451ccce9bb8SPaul Gortmaker static int 45213583bf1SThomas Gleixner do_boot_cpu (int sapicid, int cpu, struct task_struct *idle) 4531da177e4SLinus Torvalds { 4541da177e4SLinus Torvalds int timeout; 455b8d8b883SAshok Raj 45613583bf1SThomas Gleixner task_for_booting_cpu = idle; 4571da177e4SLinus Torvalds Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); 4581da177e4SLinus Torvalds 459b8d8b883SAshok Raj set_brendez_area(cpu); 46005933aacSChristoph Hellwig ia64_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* 4631da177e4SLinus Torvalds * Wait 10s total for the AP to start 4641da177e4SLinus Torvalds */ 4651da177e4SLinus Torvalds Dprintk("Waiting on callin_map ..."); 4661da177e4SLinus Torvalds for (timeout = 0; timeout < 100000; timeout++) { 4675d2068daSRusty Russell if (cpumask_test_cpu(cpu, &cpu_callin_map)) 4681da177e4SLinus Torvalds break; /* It has booted */ 4695eda7861SRusty Russell barrier(); /* Make sure we re-read cpu_callin_map */ 4701da177e4SLinus Torvalds udelay(100); 4711da177e4SLinus Torvalds } 4721da177e4SLinus Torvalds Dprintk("\n"); 4731da177e4SLinus Torvalds 4745d2068daSRusty Russell if (!cpumask_test_cpu(cpu, &cpu_callin_map)) { 4751da177e4SLinus Torvalds printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); 4761da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = -1; 4777d7f9848SSrivatsa S. Bhat set_cpu_online(cpu, false); /* was set in smp_callin() */ 4781da177e4SLinus Torvalds return -EINVAL; 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds return 0; 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds static int __init 4841da177e4SLinus Torvalds decay (char *str) 4851da177e4SLinus Torvalds { 4861da177e4SLinus Torvalds int ticks; 4871da177e4SLinus Torvalds get_option (&str, &ticks); 4881da177e4SLinus Torvalds return 1; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds __setup("decay=", decay); 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds /* 4941da177e4SLinus Torvalds * Initialize the logical CPU number to SAPICID mapping 4951da177e4SLinus Torvalds */ 4961da177e4SLinus Torvalds void __init 4971da177e4SLinus Torvalds smp_build_cpu_map (void) 4981da177e4SLinus Torvalds { 4991da177e4SLinus Torvalds int sapicid, cpu, i; 5001da177e4SLinus Torvalds int boot_cpu_id = hard_smp_processor_id(); 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds for (cpu = 0; cpu < NR_CPUS; cpu++) { 5031da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = -1; 5041da177e4SLinus Torvalds } 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds ia64_cpu_to_sapicid[0] = boot_cpu_id; 5077d7f9848SSrivatsa S. Bhat init_cpu_present(cpumask_of(0)); 5082af51a3fSRusty Russell set_cpu_possible(0, true); 5091da177e4SLinus Torvalds for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { 5101da177e4SLinus Torvalds sapicid = smp_boot_data.cpu_phys_id[i]; 5111da177e4SLinus Torvalds if (sapicid == boot_cpu_id) 5121da177e4SLinus Torvalds continue; 5132af51a3fSRusty Russell set_cpu_present(cpu, true); 5142af51a3fSRusty Russell set_cpu_possible(cpu, true); 5151da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = sapicid; 5161da177e4SLinus Torvalds cpu++; 5171da177e4SLinus Torvalds } 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds /* 5211da177e4SLinus Torvalds * Cycle through the APs sending Wakeup IPIs to boot each. 5221da177e4SLinus Torvalds */ 5231da177e4SLinus Torvalds void __init 5241da177e4SLinus Torvalds smp_prepare_cpus (unsigned int max_cpus) 5251da177e4SLinus Torvalds { 5261da177e4SLinus Torvalds int boot_cpu_id = hard_smp_processor_id(); 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds /* 5291da177e4SLinus Torvalds * Initialize the per-CPU profiling counter/multiplier 5301da177e4SLinus Torvalds */ 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds smp_setup_percpu_timer(); 5331da177e4SLinus Torvalds 5345d2068daSRusty Russell cpumask_set_cpu(0, &cpu_callin_map); 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds local_cpu_data->loops_per_jiffy = loops_per_jiffy; 5371da177e4SLinus Torvalds ia64_cpu_to_sapicid[0] = boot_cpu_id; 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); 5401da177e4SLinus Torvalds 5411da177e4SLinus Torvalds current_thread_info()->cpu = 0; 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds /* 5441da177e4SLinus Torvalds * If SMP should be disabled, then really disable it! 5451da177e4SLinus Torvalds */ 5461da177e4SLinus Torvalds if (!max_cpus) { 5471da177e4SLinus Torvalds printk(KERN_INFO "SMP mode deactivated.\n"); 5482af51a3fSRusty Russell init_cpu_online(cpumask_of(0)); 5492af51a3fSRusty Russell init_cpu_present(cpumask_of(0)); 5502af51a3fSRusty Russell init_cpu_possible(cpumask_of(0)); 5511da177e4SLinus Torvalds return; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds } 5541da177e4SLinus Torvalds 5555b5e76e9SGreg Kroah-Hartman void smp_prepare_boot_cpu(void) 5561da177e4SLinus Torvalds { 5577d7f9848SSrivatsa S. Bhat set_cpu_online(smp_processor_id(), true); 5585d2068daSRusty Russell cpumask_set_cpu(smp_processor_id(), &cpu_callin_map); 5593bccd996SLee Schermerhorn set_numa_node(cpu_to_node_map[smp_processor_id()]); 560a9fa06c2SShaohua Li per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds #ifdef CONFIG_HOTPLUG_CPU 564e927ecb0SSuresh Siddha static inline void 565e927ecb0SSuresh Siddha clear_cpu_sibling_map(int cpu) 566e927ecb0SSuresh Siddha { 567e927ecb0SSuresh Siddha int i; 568e927ecb0SSuresh Siddha 5695d2068daSRusty Russell for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu)) 5705d2068daSRusty Russell cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, i)); 5715d2068daSRusty Russell for_each_cpu(i, &cpu_core_map[cpu]) 5725d2068daSRusty Russell cpumask_clear_cpu(cpu, &cpu_core_map[i]); 573e927ecb0SSuresh Siddha 574d5a7430dSMike Travis per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE; 575e927ecb0SSuresh Siddha } 576e927ecb0SSuresh Siddha 577e927ecb0SSuresh Siddha static void 578e927ecb0SSuresh Siddha remove_siblinginfo(int cpu) 579e927ecb0SSuresh Siddha { 580e927ecb0SSuresh Siddha int last = 0; 581e927ecb0SSuresh Siddha 582e927ecb0SSuresh Siddha if (cpu_data(cpu)->threads_per_core == 1 && 583e927ecb0SSuresh Siddha cpu_data(cpu)->cores_per_socket == 1) { 5845d2068daSRusty Russell cpumask_clear_cpu(cpu, &cpu_core_map[cpu]); 5855d2068daSRusty Russell cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); 586e927ecb0SSuresh Siddha return; 587e927ecb0SSuresh Siddha } 588e927ecb0SSuresh Siddha 5895d2068daSRusty Russell last = (cpumask_weight(&cpu_core_map[cpu]) == 1 ? 1 : 0); 590e927ecb0SSuresh Siddha 591e927ecb0SSuresh Siddha /* remove it from all sibling map's */ 592e927ecb0SSuresh Siddha clear_cpu_sibling_map(cpu); 593e927ecb0SSuresh Siddha } 594e927ecb0SSuresh Siddha 5951da177e4SLinus Torvalds extern void fixup_irqs(void); 596ff741906SAshok Raj 597ff741906SAshok Raj int migrate_platform_irqs(unsigned int cpu) 598ff741906SAshok Raj { 599ff741906SAshok Raj int new_cpei_cpu; 600097e98b4SThomas Gleixner struct irq_data *data = NULL; 6010de26520SRusty Russell const struct cpumask *mask; 602ff741906SAshok Raj int retval = 0; 603ff741906SAshok Raj 604ff741906SAshok Raj /* 605ff741906SAshok Raj * dont permit CPEI target to removed. 606ff741906SAshok Raj */ 607ff741906SAshok Raj if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { 608ff741906SAshok Raj printk ("CPU (%d) is CPEI Target\n", cpu); 609ff741906SAshok Raj if (can_cpei_retarget()) { 610ff741906SAshok Raj /* 611ff741906SAshok Raj * Now re-target the CPEI to a different processor 612ff741906SAshok Raj */ 6137d7f9848SSrivatsa S. Bhat new_cpei_cpu = cpumask_any(cpu_online_mask); 6140de26520SRusty Russell mask = cpumask_of(new_cpei_cpu); 615ff741906SAshok Raj set_cpei_target_cpu(new_cpei_cpu); 616097e98b4SThomas Gleixner data = irq_get_irq_data(ia64_cpe_irq); 617ff741906SAshok Raj /* 61872fdbdceSSimon Arlott * Switch for now, immediately, we need to do fake intr 619ff741906SAshok Raj * as other interrupts, but need to study CPEI behaviour with 620ff741906SAshok Raj * polling before making changes. 621ff741906SAshok Raj */ 622097e98b4SThomas Gleixner if (data && data->chip) { 623097e98b4SThomas Gleixner data->chip->irq_disable(data); 624097e98b4SThomas Gleixner data->chip->irq_set_affinity(data, mask, false); 625097e98b4SThomas Gleixner data->chip->irq_enable(data); 62625985edcSLucas De Marchi printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu); 627ff741906SAshok Raj } 628ff741906SAshok Raj } 629097e98b4SThomas Gleixner if (!data) { 630ff741906SAshok Raj printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); 631ff741906SAshok Raj retval = -EBUSY; 632ff741906SAshok Raj } 633ff741906SAshok Raj } 634ff741906SAshok Raj return retval; 635ff741906SAshok Raj } 636ff741906SAshok Raj 6371da177e4SLinus Torvalds /* must be called with cpucontrol mutex held */ 6381da177e4SLinus Torvalds int __cpu_disable(void) 6391da177e4SLinus Torvalds { 6401da177e4SLinus Torvalds int cpu = smp_processor_id(); 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvalds /* 6431da177e4SLinus Torvalds * dont permit boot processor for now 6441da177e4SLinus Torvalds */ 645ff741906SAshok Raj if (cpu == 0 && !bsp_remove_ok) { 646ff741906SAshok Raj printk ("Your platform does not support removal of BSP\n"); 647ff741906SAshok Raj return (-EBUSY); 648ff741906SAshok Raj } 649ff741906SAshok Raj 6507d7f9848SSrivatsa S. Bhat set_cpu_online(cpu, false); 65166db2e63SAlex Chiang 652ff741906SAshok Raj if (migrate_platform_irqs(cpu)) { 6537d7f9848SSrivatsa S. Bhat set_cpu_online(cpu, true); 654c0acdea2SAlex Chiang return -EBUSY; 655ff741906SAshok Raj } 6561da177e4SLinus Torvalds 657e927ecb0SSuresh Siddha remove_siblinginfo(cpu); 65866db2e63SAlex Chiang fixup_irqs(); 6591da177e4SLinus Torvalds local_flush_tlb_all(); 6605d2068daSRusty Russell cpumask_clear_cpu(cpu, &cpu_callin_map); 6611da177e4SLinus Torvalds return 0; 6621da177e4SLinus Torvalds } 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds void __cpu_die(unsigned int cpu) 6651da177e4SLinus Torvalds { 6661da177e4SLinus Torvalds unsigned int i; 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds for (i = 0; i < 100; i++) { 6691da177e4SLinus Torvalds /* They ack this in play_dead by setting CPU_DEAD */ 6701da177e4SLinus Torvalds if (per_cpu(cpu_state, cpu) == CPU_DEAD) 6711da177e4SLinus Torvalds { 672b8d8b883SAshok Raj printk ("CPU %d is now offline\n", cpu); 6731da177e4SLinus Torvalds return; 6741da177e4SLinus Torvalds } 6751da177e4SLinus Torvalds msleep(100); 6761da177e4SLinus Torvalds } 6771da177e4SLinus Torvalds printk(KERN_ERR "CPU %u didn't die...\n", cpu); 6781da177e4SLinus Torvalds } 6791da177e4SLinus Torvalds #endif /* CONFIG_HOTPLUG_CPU */ 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds void 6821da177e4SLinus Torvalds smp_cpus_done (unsigned int dummy) 6831da177e4SLinus Torvalds { 6841da177e4SLinus Torvalds int cpu; 6851da177e4SLinus Torvalds unsigned long bogosum = 0; 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds /* 6881da177e4SLinus Torvalds * Allow the user to impress friends. 6891da177e4SLinus Torvalds */ 6901da177e4SLinus Torvalds 691dc565b52Shawkes@sgi.com for_each_online_cpu(cpu) { 6921da177e4SLinus Torvalds bogosum += cpu_data(cpu)->loops_per_jiffy; 693dc565b52Shawkes@sgi.com } 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", 6961da177e4SLinus Torvalds (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); 6971da177e4SLinus Torvalds } 6981da177e4SLinus Torvalds 6995b5e76e9SGreg Kroah-Hartman static inline void set_cpu_sibling_map(int cpu) 700e927ecb0SSuresh Siddha { 701e927ecb0SSuresh Siddha int i; 702e927ecb0SSuresh Siddha 703e927ecb0SSuresh Siddha for_each_online_cpu(i) { 704e927ecb0SSuresh Siddha if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { 7055d2068daSRusty Russell cpumask_set_cpu(i, &cpu_core_map[cpu]); 7065d2068daSRusty Russell cpumask_set_cpu(cpu, &cpu_core_map[i]); 707e927ecb0SSuresh Siddha if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { 7085d2068daSRusty Russell cpumask_set_cpu(i, 7095d2068daSRusty Russell &per_cpu(cpu_sibling_map, cpu)); 7105d2068daSRusty Russell cpumask_set_cpu(cpu, 7115d2068daSRusty Russell &per_cpu(cpu_sibling_map, i)); 712e927ecb0SSuresh Siddha } 713e927ecb0SSuresh Siddha } 714e927ecb0SSuresh Siddha } 715e927ecb0SSuresh Siddha } 716e927ecb0SSuresh Siddha 717ccce9bb8SPaul Gortmaker int 7188239c25fSThomas Gleixner __cpu_up(unsigned int cpu, struct task_struct *tidle) 7191da177e4SLinus Torvalds { 7201da177e4SLinus Torvalds int ret; 7211da177e4SLinus Torvalds int sapicid; 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds sapicid = ia64_cpu_to_sapicid[cpu]; 7241da177e4SLinus Torvalds if (sapicid == -1) 7251da177e4SLinus Torvalds return -EINVAL; 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* 728b8d8b883SAshok Raj * Already booted cpu? not valid anymore since we dont 729b8d8b883SAshok Raj * do idle loop tightspin anymore. 7301da177e4SLinus Torvalds */ 7315d2068daSRusty Russell if (cpumask_test_cpu(cpu, &cpu_callin_map)) 732b8d8b883SAshok Raj return -EINVAL; 733b8d8b883SAshok Raj 734a9fa06c2SShaohua Li per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; 7351da177e4SLinus Torvalds /* Processor goes to start_secondary(), sets online flag */ 73613583bf1SThomas Gleixner ret = do_boot_cpu(sapicid, cpu, tidle); 7371da177e4SLinus Torvalds if (ret < 0) 7381da177e4SLinus Torvalds return ret; 7391da177e4SLinus Torvalds 740e927ecb0SSuresh Siddha if (cpu_data(cpu)->threads_per_core == 1 && 741e927ecb0SSuresh Siddha cpu_data(cpu)->cores_per_socket == 1) { 7425d2068daSRusty Russell cpumask_set_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); 7435d2068daSRusty Russell cpumask_set_cpu(cpu, &cpu_core_map[cpu]); 744e927ecb0SSuresh Siddha return 0; 745e927ecb0SSuresh Siddha } 746e927ecb0SSuresh Siddha 747e927ecb0SSuresh Siddha set_cpu_sibling_map(cpu); 748e927ecb0SSuresh Siddha 7491da177e4SLinus Torvalds return 0; 7501da177e4SLinus Torvalds } 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds /* 75372fdbdceSSimon Arlott * Assume that CPUs have been discovered by some platform-dependent interface. For 7541da177e4SLinus Torvalds * SoftSDV/Lion, that would be ACPI. 7551da177e4SLinus Torvalds * 7561da177e4SLinus Torvalds * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). 7571da177e4SLinus Torvalds */ 7581da177e4SLinus Torvalds void __init 7591da177e4SLinus Torvalds init_smp_config(void) 7601da177e4SLinus Torvalds { 7611da177e4SLinus Torvalds struct fptr { 7621da177e4SLinus Torvalds unsigned long fp; 7631da177e4SLinus Torvalds unsigned long gp; 7641da177e4SLinus Torvalds } *ap_startup; 7651da177e4SLinus Torvalds long sal_ret; 7661da177e4SLinus Torvalds 76772fdbdceSSimon Arlott /* Tell SAL where to drop the APs. */ 7681da177e4SLinus Torvalds ap_startup = (struct fptr *) start_ap; 7691da177e4SLinus Torvalds sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, 7701da177e4SLinus Torvalds ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); 7711da177e4SLinus Torvalds if (sal_ret < 0) 7721da177e4SLinus Torvalds printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", 7731da177e4SLinus Torvalds ia64_sal_strerror(sal_ret)); 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds 776e927ecb0SSuresh Siddha /* 777e927ecb0SSuresh Siddha * identify_siblings(cpu) gets called from identify_cpu. This populates the 778e927ecb0SSuresh Siddha * information related to logical execution units in per_cpu_data structure. 779e927ecb0SSuresh Siddha */ 7805b5e76e9SGreg Kroah-Hartman void identify_siblings(struct cpuinfo_ia64 *c) 781e927ecb0SSuresh Siddha { 782e088a4adSMatthew Wilcox long status; 783e927ecb0SSuresh Siddha u16 pltid; 784e927ecb0SSuresh Siddha pal_logical_to_physical_t info; 785e927ecb0SSuresh Siddha 7866ff0bc94SAlex Chiang status = ia64_pal_logical_to_phys(-1, &info); 7876ff0bc94SAlex Chiang if (status != PAL_STATUS_SUCCESS) { 788113134fcSAlex Chiang if (status != PAL_STATUS_UNIMPLEMENTED) { 789113134fcSAlex Chiang printk(KERN_ERR 790113134fcSAlex Chiang "ia64_pal_logical_to_phys failed with %ld\n", 791e927ecb0SSuresh Siddha status); 792e927ecb0SSuresh Siddha return; 793e927ecb0SSuresh Siddha } 794113134fcSAlex Chiang 795113134fcSAlex Chiang info.overview_ppid = 0; 796113134fcSAlex Chiang info.overview_cpp = 1; 797113134fcSAlex Chiang info.overview_tpc = 1; 798113134fcSAlex Chiang } 7996ff0bc94SAlex Chiang 8006ff0bc94SAlex Chiang status = ia64_sal_physical_id_info(&pltid); 8016ff0bc94SAlex Chiang if (status != PAL_STATUS_SUCCESS) { 8026ff0bc94SAlex Chiang if (status != PAL_STATUS_UNIMPLEMENTED) 8036ff0bc94SAlex Chiang printk(KERN_ERR 8046ff0bc94SAlex Chiang "ia64_sal_pltid failed with %ld\n", 8056ff0bc94SAlex Chiang status); 806e927ecb0SSuresh Siddha return; 807e927ecb0SSuresh Siddha } 808e927ecb0SSuresh Siddha 809e927ecb0SSuresh Siddha c->socket_id = (pltid << 8) | info.overview_ppid; 810113134fcSAlex Chiang 811113134fcSAlex Chiang if (info.overview_cpp == 1 && info.overview_tpc == 1) 812113134fcSAlex Chiang return; 813113134fcSAlex Chiang 814e927ecb0SSuresh Siddha c->cores_per_socket = info.overview_cpp; 815e927ecb0SSuresh Siddha c->threads_per_core = info.overview_tpc; 8164129a953SFenghua Yu c->num_log = info.overview_num_log; 817e927ecb0SSuresh Siddha 818e927ecb0SSuresh Siddha c->core_id = info.log1_cid; 819e927ecb0SSuresh Siddha c->thread_id = info.log1_tid; 820e927ecb0SSuresh Siddha } 821dd562c05SStephane Eranian 822dd562c05SStephane Eranian /* 823dd562c05SStephane Eranian * returns non zero, if multi-threading is enabled 824dd562c05SStephane Eranian * on at least one physical package. Due to hotplug cpu 825dd562c05SStephane Eranian * and (maxcpus=), all threads may not necessarily be enabled 826dd562c05SStephane Eranian * even though the processor supports multi-threading. 827dd562c05SStephane Eranian */ 828dd562c05SStephane Eranian int is_multithreading_enabled(void) 829dd562c05SStephane Eranian { 830dd562c05SStephane Eranian int i, j; 831dd562c05SStephane Eranian 832dd562c05SStephane Eranian for_each_present_cpu(i) { 833dd562c05SStephane Eranian for_each_present_cpu(j) { 834dd562c05SStephane Eranian if (j == i) 835dd562c05SStephane Eranian continue; 836dd562c05SStephane Eranian if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { 837dd562c05SStephane Eranian if (cpu_data(j)->core_id == cpu_data(i)->core_id) 838dd562c05SStephane Eranian return 1; 839dd562c05SStephane Eranian } 840dd562c05SStephane Eranian } 841dd562c05SStephane Eranian } 842dd562c05SStephane Eranian return 0; 843dd562c05SStephane Eranian } 844dd562c05SStephane Eranian EXPORT_SYMBOL_GPL(is_multithreading_enabled); 845