11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * SMP boot-related support 31da177e4SLinus Torvalds * 482975115SDavid Mosberger-Tang * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co 51da177e4SLinus Torvalds * David Mosberger-Tang <davidm@hpl.hp.com> 6e927ecb0SSuresh Siddha * Copyright (C) 2001, 2004-2005 Intel Corp 7e927ecb0SSuresh Siddha * Rohit Seth <rohit.seth@intel.com> 8e927ecb0SSuresh Siddha * Suresh Siddha <suresh.b.siddha@intel.com> 9e927ecb0SSuresh Siddha * Gordon Jin <gordon.jin@intel.com> 10e927ecb0SSuresh Siddha * Ashok Raj <ashok.raj@intel.com> 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here. 131da177e4SLinus Torvalds * 01/04/27 David Mosberger <davidm@hpl.hp.com> Added ITC synching code. 141da177e4SLinus Torvalds * 02/07/31 David Mosberger <davidm@hpl.hp.com> Switch over to hotplug-CPU boot-sequence. 151da177e4SLinus Torvalds * smp_boot_cpus()/smp_commence() is replaced by 161da177e4SLinus Torvalds * smp_prepare_cpus()/__cpu_up()/smp_cpus_done(). 17b8d8b883SAshok Raj * 04/06/21 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support 18e927ecb0SSuresh Siddha * 04/12/26 Jin Gordon <gordon.jin@intel.com> 19e927ecb0SSuresh Siddha * 04/12/26 Rohit Seth <rohit.seth@intel.com> 20e927ecb0SSuresh Siddha * Add multi-threading and multi-core detection 21e927ecb0SSuresh Siddha * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com> 22e927ecb0SSuresh Siddha * Setup cpu_sibling_map and cpu_core_map 231da177e4SLinus Torvalds */ 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <linux/module.h> 261da177e4SLinus Torvalds #include <linux/acpi.h> 271da177e4SLinus Torvalds #include <linux/bootmem.h> 281da177e4SLinus Torvalds #include <linux/cpu.h> 291da177e4SLinus Torvalds #include <linux/delay.h> 301da177e4SLinus Torvalds #include <linux/init.h> 311da177e4SLinus Torvalds #include <linux/interrupt.h> 321da177e4SLinus Torvalds #include <linux/irq.h> 331da177e4SLinus Torvalds #include <linux/kernel.h> 341da177e4SLinus Torvalds #include <linux/kernel_stat.h> 351da177e4SLinus Torvalds #include <linux/mm.h> 361da177e4SLinus Torvalds #include <linux/notifier.h> 371da177e4SLinus Torvalds #include <linux/smp.h> 381da177e4SLinus Torvalds #include <linux/spinlock.h> 391da177e4SLinus Torvalds #include <linux/efi.h> 401da177e4SLinus Torvalds #include <linux/percpu.h> 411da177e4SLinus Torvalds #include <linux/bitops.h> 421da177e4SLinus Torvalds 4360063497SArun Sharma #include <linux/atomic.h> 441da177e4SLinus Torvalds #include <asm/cache.h> 451da177e4SLinus Torvalds #include <asm/current.h> 461da177e4SLinus Torvalds #include <asm/delay.h> 471da177e4SLinus Torvalds #include <asm/io.h> 481da177e4SLinus Torvalds #include <asm/irq.h> 491da177e4SLinus Torvalds #include <asm/machvec.h> 501da177e4SLinus Torvalds #include <asm/mca.h> 511da177e4SLinus Torvalds #include <asm/page.h> 52e51835d5SIsaku Yamahata #include <asm/paravirt.h> 531da177e4SLinus Torvalds #include <asm/pgalloc.h> 541da177e4SLinus Torvalds #include <asm/pgtable.h> 551da177e4SLinus Torvalds #include <asm/processor.h> 561da177e4SLinus Torvalds #include <asm/ptrace.h> 571da177e4SLinus Torvalds #include <asm/sal.h> 581da177e4SLinus Torvalds #include <asm/tlbflush.h> 591da177e4SLinus Torvalds #include <asm/unistd.h> 606e9de181SJohn Keller #include <asm/sn/arch.h> 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds #define SMP_DEBUG 0 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds #if SMP_DEBUG 651da177e4SLinus Torvalds #define Dprintk(x...) printk(x) 661da177e4SLinus Torvalds #else 671da177e4SLinus Torvalds #define Dprintk(x...) 681da177e4SLinus Torvalds #endif 691da177e4SLinus Torvalds 70b8d8b883SAshok Raj #ifdef CONFIG_HOTPLUG_CPU 71ff741906SAshok Raj #ifdef CONFIG_PERMIT_BSP_REMOVE 72ff741906SAshok Raj #define bsp_remove_ok 1 73ff741906SAshok Raj #else 74ff741906SAshok Raj #define bsp_remove_ok 0 75ff741906SAshok Raj #endif 76ff741906SAshok Raj 77b8d8b883SAshok Raj /* 78b8d8b883SAshok Raj * Global array allocated for NR_CPUS at boot time 79b8d8b883SAshok Raj */ 80b8d8b883SAshok Raj struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS]; 81b8d8b883SAshok Raj 82b8d8b883SAshok Raj /* 83b8d8b883SAshok Raj * start_ap in head.S uses this to store current booting cpu 84b8d8b883SAshok Raj * info. 85b8d8b883SAshok Raj */ 86b8d8b883SAshok Raj struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0]; 87b8d8b883SAshok Raj 88b8d8b883SAshok Raj #define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]); 89b8d8b883SAshok Raj 90b8d8b883SAshok Raj #else 91b8d8b883SAshok Raj #define set_brendez_area(x) 92b8d8b883SAshok Raj #endif 93b8d8b883SAshok Raj 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds /* 961da177e4SLinus Torvalds * ITC synchronization related stuff: 971da177e4SLinus Torvalds */ 98ff741906SAshok Raj #define MASTER (0) 991da177e4SLinus Torvalds #define SLAVE (SMP_CACHE_BYTES/8) 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds #define NUM_ROUNDS 64 /* magic value */ 1021da177e4SLinus Torvalds #define NUM_ITERS 5 /* likewise */ 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds static DEFINE_SPINLOCK(itc_sync_lock); 1051da177e4SLinus Torvalds static volatile unsigned long go[SLAVE + 1]; 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds #define DEBUG_ITC_SYNC 0 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds extern void start_ap (void); 1101da177e4SLinus Torvalds extern unsigned long ia64_iobase; 1111da177e4SLinus Torvalds 11236c8b586SIngo Molnar struct task_struct *task_for_booting_cpu; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds /* 1151da177e4SLinus Torvalds * State for each CPU 1161da177e4SLinus Torvalds */ 1171da177e4SLinus Torvalds DEFINE_PER_CPU(int, cpu_state); 1181da177e4SLinus Torvalds 119e927ecb0SSuresh Siddha cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; 12042aca483SRobin Holt EXPORT_SYMBOL(cpu_core_map); 121d5a7430dSMike Travis DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); 122d5a7430dSMike Travis EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); 123d5a7430dSMike Travis 124e927ecb0SSuresh Siddha int smp_num_siblings = 1; 125e927ecb0SSuresh Siddha 1261da177e4SLinus Torvalds /* which logical CPU number maps to which CPU (physical APIC ID) */ 1271da177e4SLinus Torvalds volatile int ia64_cpu_to_sapicid[NR_CPUS]; 1281da177e4SLinus Torvalds EXPORT_SYMBOL(ia64_cpu_to_sapicid); 1291da177e4SLinus Torvalds 1305eda7861SRusty Russell static cpumask_t cpu_callin_map; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds struct smp_boot_data smp_boot_data __initdata; 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds char __initdata no_int_routing; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ 1391da177e4SLinus Torvalds 140ff741906SAshok Raj #ifdef CONFIG_FORCE_CPEI_RETARGET 141ff741906SAshok Raj #define CPEI_OVERRIDE_DEFAULT (1) 142ff741906SAshok Raj #else 143ff741906SAshok Raj #define CPEI_OVERRIDE_DEFAULT (0) 144ff741906SAshok Raj #endif 145ff741906SAshok Raj 146ff741906SAshok Raj unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; 147ff741906SAshok Raj 148ff741906SAshok Raj static int __init 149ff741906SAshok Raj cmdl_force_cpei(char *str) 150ff741906SAshok Raj { 151ff741906SAshok Raj int value=0; 152ff741906SAshok Raj 153ff741906SAshok Raj get_option (&str, &value); 154ff741906SAshok Raj force_cpei_retarget = value; 155ff741906SAshok Raj 156ff741906SAshok Raj return 1; 157ff741906SAshok Raj } 158ff741906SAshok Raj 159ff741906SAshok Raj __setup("force_cpei=", cmdl_force_cpei); 160ff741906SAshok Raj 1611da177e4SLinus Torvalds static int __init 1621da177e4SLinus Torvalds nointroute (char *str) 1631da177e4SLinus Torvalds { 1641da177e4SLinus Torvalds no_int_routing = 1; 1651da177e4SLinus Torvalds printk ("no_int_routing on\n"); 1661da177e4SLinus Torvalds return 1; 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds __setup("nointroute", nointroute); 1701da177e4SLinus Torvalds 171ff741906SAshok Raj static void fix_b0_for_bsp(void) 172ff741906SAshok Raj { 173ff741906SAshok Raj #ifdef CONFIG_HOTPLUG_CPU 174ff741906SAshok Raj int cpuid; 175ff741906SAshok Raj static int fix_bsp_b0 = 1; 176ff741906SAshok Raj 177ff741906SAshok Raj cpuid = smp_processor_id(); 178ff741906SAshok Raj 179ff741906SAshok Raj /* 180ff741906SAshok Raj * Cache the b0 value on the first AP that comes up 181ff741906SAshok Raj */ 182ff741906SAshok Raj if (!(fix_bsp_b0 && cpuid)) 183ff741906SAshok Raj return; 184ff741906SAshok Raj 185ff741906SAshok Raj sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0]; 186ff741906SAshok Raj printk ("Fixed BSP b0 value from CPU %d\n", cpuid); 187ff741906SAshok Raj 188ff741906SAshok Raj fix_bsp_b0 = 0; 189ff741906SAshok Raj #endif 190ff741906SAshok Raj } 191ff741906SAshok Raj 1921da177e4SLinus Torvalds void 1931da177e4SLinus Torvalds sync_master (void *arg) 1941da177e4SLinus Torvalds { 1951da177e4SLinus Torvalds unsigned long flags, i; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds go[MASTER] = 0; 1981da177e4SLinus Torvalds 1991da177e4SLinus Torvalds local_irq_save(flags); 2001da177e4SLinus Torvalds { 2011da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) { 20282975115SDavid Mosberger-Tang while (!go[MASTER]) 20382975115SDavid Mosberger-Tang cpu_relax(); 2041da177e4SLinus Torvalds go[MASTER] = 0; 2051da177e4SLinus Torvalds go[SLAVE] = ia64_get_itc(); 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds } 2081da177e4SLinus Torvalds local_irq_restore(flags); 2091da177e4SLinus Torvalds } 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvalds /* 2121da177e4SLinus Torvalds * Return the number of cycles by which our itc differs from the itc on the master 2131da177e4SLinus Torvalds * (time-keeper) CPU. A positive number indicates our itc is ahead of the master, 2141da177e4SLinus Torvalds * negative that it is behind. 2151da177e4SLinus Torvalds */ 2161da177e4SLinus Torvalds static inline long 2171da177e4SLinus Torvalds get_delta (long *rt, long *master) 2181da177e4SLinus Torvalds { 2191da177e4SLinus Torvalds unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; 2201da177e4SLinus Torvalds unsigned long tcenter, t0, t1, tm; 2211da177e4SLinus Torvalds long i; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds for (i = 0; i < NUM_ITERS; ++i) { 2241da177e4SLinus Torvalds t0 = ia64_get_itc(); 2251da177e4SLinus Torvalds go[MASTER] = 1; 22682975115SDavid Mosberger-Tang while (!(tm = go[SLAVE])) 22782975115SDavid Mosberger-Tang cpu_relax(); 2281da177e4SLinus Torvalds go[SLAVE] = 0; 2291da177e4SLinus Torvalds t1 = ia64_get_itc(); 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds if (t1 - t0 < best_t1 - best_t0) 2321da177e4SLinus Torvalds best_t0 = t0, best_t1 = t1, best_tm = tm; 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds *rt = best_t1 - best_t0; 2361da177e4SLinus Torvalds *master = best_tm - best_t0; 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds /* average best_t0 and best_t1 without overflow: */ 2391da177e4SLinus Torvalds tcenter = (best_t0/2 + best_t1/2); 2401da177e4SLinus Torvalds if (best_t0 % 2 + best_t1 % 2 == 2) 2411da177e4SLinus Torvalds ++tcenter; 2421da177e4SLinus Torvalds return tcenter - best_tm; 2431da177e4SLinus Torvalds } 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds /* 2461da177e4SLinus Torvalds * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU 2471da177e4SLinus Torvalds * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of 2481da177e4SLinus Torvalds * unaccounted-for errors (such as getting a machine check in the middle of a calibration 2491da177e4SLinus Torvalds * step). The basic idea is for the slave to ask the master what itc value it has and to 2501da177e4SLinus Torvalds * read its own itc before and after the master responds. Each iteration gives us three 2511da177e4SLinus Torvalds * timestamps: 2521da177e4SLinus Torvalds * 2531da177e4SLinus Torvalds * slave master 2541da177e4SLinus Torvalds * 2551da177e4SLinus Torvalds * t0 ---\ 2561da177e4SLinus Torvalds * ---\ 2571da177e4SLinus Torvalds * ---> 2581da177e4SLinus Torvalds * tm 2591da177e4SLinus Torvalds * /--- 2601da177e4SLinus Torvalds * /--- 2611da177e4SLinus Torvalds * t1 <--- 2621da177e4SLinus Torvalds * 2631da177e4SLinus Torvalds * 2641da177e4SLinus Torvalds * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0 2651da177e4SLinus Torvalds * and t1. If we achieve this, the clocks are synchronized provided the interconnect 2661da177e4SLinus Torvalds * between the slave and the master is symmetric. Even if the interconnect were 2671da177e4SLinus Torvalds * asymmetric, we would still know that the synchronization error is smaller than the 2681da177e4SLinus Torvalds * roundtrip latency (t0 - t1). 2691da177e4SLinus Torvalds * 2701da177e4SLinus Torvalds * When the interconnect is quiet and symmetric, this lets us synchronize the itc to 2711da177e4SLinus Torvalds * within one or two cycles. However, we can only *guarantee* that the synchronization is 2721da177e4SLinus Torvalds * accurate to within a round-trip time, which is typically in the range of several 2731da177e4SLinus Torvalds * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually 2741da177e4SLinus Torvalds * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better 2751da177e4SLinus Torvalds * than half a micro second or so. 2761da177e4SLinus Torvalds */ 2771da177e4SLinus Torvalds void 2781da177e4SLinus Torvalds ia64_sync_itc (unsigned int master) 2791da177e4SLinus Torvalds { 2801da177e4SLinus Torvalds long i, delta, adj, adjust_latency = 0, done = 0; 2811da177e4SLinus Torvalds unsigned long flags, rt, master_time_stamp, bound; 2821da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 2831da177e4SLinus Torvalds struct { 2841da177e4SLinus Torvalds long rt; /* roundtrip time */ 2851da177e4SLinus Torvalds long master; /* master's timestamp */ 2861da177e4SLinus Torvalds long diff; /* difference between midpoint and master's timestamp */ 2871da177e4SLinus Torvalds long lat; /* estimate of itc adjustment latency */ 2881da177e4SLinus Torvalds } t[NUM_ROUNDS]; 2891da177e4SLinus Torvalds #endif 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds /* 2921da177e4SLinus Torvalds * Make sure local timer ticks are disabled while we sync. If 2931da177e4SLinus Torvalds * they were enabled, we'd have to worry about nasty issues 2941da177e4SLinus Torvalds * like setting the ITC ahead of (or a long time before) the 2951da177e4SLinus Torvalds * next scheduled tick. 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds BUG_ON((ia64_get_itv() & (1 << 16)) == 0); 2981da177e4SLinus Torvalds 2991da177e4SLinus Torvalds go[MASTER] = 1; 3001da177e4SLinus Torvalds 3018691e5a8SJens Axboe if (smp_call_function_single(master, sync_master, NULL, 0) < 0) { 3021da177e4SLinus Torvalds printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); 3031da177e4SLinus Torvalds return; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 30682975115SDavid Mosberger-Tang while (go[MASTER]) 30782975115SDavid Mosberger-Tang cpu_relax(); /* wait for master to be ready */ 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds spin_lock_irqsave(&itc_sync_lock, flags); 3101da177e4SLinus Torvalds { 3111da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS; ++i) { 3121da177e4SLinus Torvalds delta = get_delta(&rt, &master_time_stamp); 3131da177e4SLinus Torvalds if (delta == 0) { 3141da177e4SLinus Torvalds done = 1; /* let's lock on to this... */ 3151da177e4SLinus Torvalds bound = rt; 3161da177e4SLinus Torvalds } 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds if (!done) { 3191da177e4SLinus Torvalds if (i > 0) { 3201da177e4SLinus Torvalds adjust_latency += -delta; 3211da177e4SLinus Torvalds adj = -delta + adjust_latency/4; 3221da177e4SLinus Torvalds } else 3231da177e4SLinus Torvalds adj = -delta; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds ia64_set_itc(ia64_get_itc() + adj); 3261da177e4SLinus Torvalds } 3271da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3281da177e4SLinus Torvalds t[i].rt = rt; 3291da177e4SLinus Torvalds t[i].master = master_time_stamp; 3301da177e4SLinus Torvalds t[i].diff = delta; 3311da177e4SLinus Torvalds t[i].lat = adjust_latency/4; 3321da177e4SLinus Torvalds #endif 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds } 3351da177e4SLinus Torvalds spin_unlock_irqrestore(&itc_sync_lock, flags); 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3381da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS; ++i) 3391da177e4SLinus Torvalds printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", 3401da177e4SLinus Torvalds t[i].rt, t[i].master, t[i].diff, t[i].lat); 3411da177e4SLinus Torvalds #endif 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, " 3441da177e4SLinus Torvalds "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt); 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds /* 3481da177e4SLinus Torvalds * Ideally sets up per-cpu profiling hooks. Doesn't do much now... 3491da177e4SLinus Torvalds */ 3505b5e76e9SGreg Kroah-Hartman static inline void smp_setup_percpu_timer(void) 3511da177e4SLinus Torvalds { 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds 354ccce9bb8SPaul Gortmaker static void 3551da177e4SLinus Torvalds smp_callin (void) 3561da177e4SLinus Torvalds { 357ff741906SAshok Raj int cpuid, phys_id, itc_master; 358ead6caaeSJack Steiner struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; 3591da177e4SLinus Torvalds extern void ia64_init_itm(void); 360ff741906SAshok Raj extern volatile int time_keeper_id; 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds #ifdef CONFIG_PERFMON 3631da177e4SLinus Torvalds extern void pfm_init_percpu(void); 3641da177e4SLinus Torvalds #endif 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds cpuid = smp_processor_id(); 3671da177e4SLinus Torvalds phys_id = hard_smp_processor_id(); 368ff741906SAshok Raj itc_master = time_keeper_id; 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds if (cpu_online(cpuid)) { 3711da177e4SLinus Torvalds printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n", 3721da177e4SLinus Torvalds phys_id, cpuid); 3731da177e4SLinus Torvalds BUG(); 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds 376ff741906SAshok Raj fix_b0_for_bsp(); 377ff741906SAshok Raj 3783bccd996SLee Schermerhorn /* 3793bccd996SLee Schermerhorn * numa_node_id() works after this. 3803bccd996SLee Schermerhorn */ 3813bccd996SLee Schermerhorn set_numa_node(cpu_to_node_map[cpuid]); 382fd1197f1SLee Schermerhorn set_numa_mem(local_memory_node(cpu_to_node_map[cpuid])); 3833bccd996SLee Schermerhorn 384e1b30a39SYasuaki Ishimatsu spin_lock(&vector_lock); 385e1b30a39SYasuaki Ishimatsu /* Setup the per cpu irq handling data structures */ 386e1b30a39SYasuaki Ishimatsu __setup_vector_irq(cpuid); 387e545a614SManfred Spraul notify_cpu_starting(cpuid); 3887d7f9848SSrivatsa S. Bhat set_cpu_online(cpuid, true); 389a9fa06c2SShaohua Li per_cpu(cpu_state, cpuid) = CPU_ONLINE; 390e1b30a39SYasuaki Ishimatsu spin_unlock(&vector_lock); 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds smp_setup_percpu_timer(); 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvalds ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds #ifdef CONFIG_PERFMON 3971da177e4SLinus Torvalds pfm_init_percpu(); 3981da177e4SLinus Torvalds #endif 3991da177e4SLinus Torvalds 4001da177e4SLinus Torvalds local_irq_enable(); 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) { 4031da177e4SLinus Torvalds /* 4041da177e4SLinus Torvalds * Synchronize the ITC with the BP. Need to do this after irqs are 4051da177e4SLinus Torvalds * enabled because ia64_sync_itc() calls smp_call_function_single(), which 4061da177e4SLinus Torvalds * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls 4071da177e4SLinus Torvalds * local_bh_enable(), which bugs out if irqs are not enabled... 4081da177e4SLinus Torvalds */ 409ff741906SAshok Raj Dprintk("Going to syncup ITC with ITC Master.\n"); 410ff741906SAshok Raj ia64_sync_itc(itc_master); 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds /* 4141da177e4SLinus Torvalds * Get our bogomips. 4151da177e4SLinus Torvalds */ 4161da177e4SLinus Torvalds ia64_init_itm(); 417ead6caaeSJack Steiner 418ead6caaeSJack Steiner /* 419ead6caaeSJack Steiner * Delay calibration can be skipped if new processor is identical to the 420ead6caaeSJack Steiner * previous processor. 421ead6caaeSJack Steiner */ 422ead6caaeSJack Steiner last_cpuinfo = cpu_data(cpuid - 1); 423ead6caaeSJack Steiner this_cpuinfo = local_cpu_data; 424ead6caaeSJack Steiner if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq || 425ead6caaeSJack Steiner last_cpuinfo->proc_freq != this_cpuinfo->proc_freq || 426ead6caaeSJack Steiner last_cpuinfo->features != this_cpuinfo->features || 427ead6caaeSJack Steiner last_cpuinfo->revision != this_cpuinfo->revision || 428ead6caaeSJack Steiner last_cpuinfo->family != this_cpuinfo->family || 429ead6caaeSJack Steiner last_cpuinfo->archrev != this_cpuinfo->archrev || 430ead6caaeSJack Steiner last_cpuinfo->model != this_cpuinfo->model) 4311da177e4SLinus Torvalds calibrate_delay(); 4321da177e4SLinus Torvalds local_cpu_data->loops_per_jiffy = loops_per_jiffy; 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds /* 4351da177e4SLinus Torvalds * Allow the master to continue. 4361da177e4SLinus Torvalds */ 4375d2068daSRusty Russell cpumask_set_cpu(cpuid, &cpu_callin_map); 4381da177e4SLinus Torvalds Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid); 4391da177e4SLinus Torvalds } 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds /* 4431da177e4SLinus Torvalds * Activate a secondary processor. head.S calls this. 4441da177e4SLinus Torvalds */ 445ccce9bb8SPaul Gortmaker int 4461da177e4SLinus Torvalds start_secondary (void *unused) 4471da177e4SLinus Torvalds { 4481da177e4SLinus Torvalds /* Early console may use I/O ports */ 4491da177e4SLinus Torvalds ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); 45010617bbeSTony Luck #ifndef CONFIG_PRINTK_TIME 4511da177e4SLinus Torvalds Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); 45210617bbeSTony Luck #endif 4531da177e4SLinus Torvalds efi_map_pal_code(); 4541da177e4SLinus Torvalds cpu_init(); 4555bfb5d69SNick Piggin preempt_disable(); 4561da177e4SLinus Torvalds smp_callin(); 4571da177e4SLinus Torvalds 45891d591c3SThomas Gleixner cpu_startup_entry(CPUHP_ONLINE); 4591da177e4SLinus Torvalds return 0; 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds 462ccce9bb8SPaul Gortmaker static int 46313583bf1SThomas Gleixner do_boot_cpu (int sapicid, int cpu, struct task_struct *idle) 4641da177e4SLinus Torvalds { 4651da177e4SLinus Torvalds int timeout; 466b8d8b883SAshok Raj 46713583bf1SThomas Gleixner task_for_booting_cpu = idle; 4681da177e4SLinus Torvalds Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); 4691da177e4SLinus Torvalds 470b8d8b883SAshok Raj set_brendez_area(cpu); 4711da177e4SLinus Torvalds platform_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds /* 4741da177e4SLinus Torvalds * Wait 10s total for the AP to start 4751da177e4SLinus Torvalds */ 4761da177e4SLinus Torvalds Dprintk("Waiting on callin_map ..."); 4771da177e4SLinus Torvalds for (timeout = 0; timeout < 100000; timeout++) { 4785d2068daSRusty Russell if (cpumask_test_cpu(cpu, &cpu_callin_map)) 4791da177e4SLinus Torvalds break; /* It has booted */ 4805eda7861SRusty Russell barrier(); /* Make sure we re-read cpu_callin_map */ 4811da177e4SLinus Torvalds udelay(100); 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds Dprintk("\n"); 4841da177e4SLinus Torvalds 4855d2068daSRusty Russell if (!cpumask_test_cpu(cpu, &cpu_callin_map)) { 4861da177e4SLinus Torvalds printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); 4871da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = -1; 4887d7f9848SSrivatsa S. Bhat set_cpu_online(cpu, false); /* was set in smp_callin() */ 4891da177e4SLinus Torvalds return -EINVAL; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds return 0; 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds static int __init 4951da177e4SLinus Torvalds decay (char *str) 4961da177e4SLinus Torvalds { 4971da177e4SLinus Torvalds int ticks; 4981da177e4SLinus Torvalds get_option (&str, &ticks); 4991da177e4SLinus Torvalds return 1; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds __setup("decay=", decay); 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds /* 5051da177e4SLinus Torvalds * Initialize the logical CPU number to SAPICID mapping 5061da177e4SLinus Torvalds */ 5071da177e4SLinus Torvalds void __init 5081da177e4SLinus Torvalds smp_build_cpu_map (void) 5091da177e4SLinus Torvalds { 5101da177e4SLinus Torvalds int sapicid, cpu, i; 5111da177e4SLinus Torvalds int boot_cpu_id = hard_smp_processor_id(); 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds for (cpu = 0; cpu < NR_CPUS; cpu++) { 5141da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = -1; 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds ia64_cpu_to_sapicid[0] = boot_cpu_id; 5187d7f9848SSrivatsa S. Bhat init_cpu_present(cpumask_of(0)); 5192af51a3fSRusty Russell set_cpu_possible(0, true); 5201da177e4SLinus Torvalds for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { 5211da177e4SLinus Torvalds sapicid = smp_boot_data.cpu_phys_id[i]; 5221da177e4SLinus Torvalds if (sapicid == boot_cpu_id) 5231da177e4SLinus Torvalds continue; 5242af51a3fSRusty Russell set_cpu_present(cpu, true); 5252af51a3fSRusty Russell set_cpu_possible(cpu, true); 5261da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = sapicid; 5271da177e4SLinus Torvalds cpu++; 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds } 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds /* 5321da177e4SLinus Torvalds * Cycle through the APs sending Wakeup IPIs to boot each. 5331da177e4SLinus Torvalds */ 5341da177e4SLinus Torvalds void __init 5351da177e4SLinus Torvalds smp_prepare_cpus (unsigned int max_cpus) 5361da177e4SLinus Torvalds { 5371da177e4SLinus Torvalds int boot_cpu_id = hard_smp_processor_id(); 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds /* 5401da177e4SLinus Torvalds * Initialize the per-CPU profiling counter/multiplier 5411da177e4SLinus Torvalds */ 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds smp_setup_percpu_timer(); 5441da177e4SLinus Torvalds 5455d2068daSRusty Russell cpumask_set_cpu(0, &cpu_callin_map); 5461da177e4SLinus Torvalds 5471da177e4SLinus Torvalds local_cpu_data->loops_per_jiffy = loops_per_jiffy; 5481da177e4SLinus Torvalds ia64_cpu_to_sapicid[0] = boot_cpu_id; 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds current_thread_info()->cpu = 0; 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds /* 5551da177e4SLinus Torvalds * If SMP should be disabled, then really disable it! 5561da177e4SLinus Torvalds */ 5571da177e4SLinus Torvalds if (!max_cpus) { 5581da177e4SLinus Torvalds printk(KERN_INFO "SMP mode deactivated.\n"); 5592af51a3fSRusty Russell init_cpu_online(cpumask_of(0)); 5602af51a3fSRusty Russell init_cpu_present(cpumask_of(0)); 5612af51a3fSRusty Russell init_cpu_possible(cpumask_of(0)); 5621da177e4SLinus Torvalds return; 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds 5665b5e76e9SGreg Kroah-Hartman void smp_prepare_boot_cpu(void) 5671da177e4SLinus Torvalds { 5687d7f9848SSrivatsa S. Bhat set_cpu_online(smp_processor_id(), true); 5695d2068daSRusty Russell cpumask_set_cpu(smp_processor_id(), &cpu_callin_map); 5703bccd996SLee Schermerhorn set_numa_node(cpu_to_node_map[smp_processor_id()]); 571a9fa06c2SShaohua Li per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; 572e51835d5SIsaku Yamahata paravirt_post_smp_prepare_boot_cpu(); 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds #ifdef CONFIG_HOTPLUG_CPU 576e927ecb0SSuresh Siddha static inline void 577e927ecb0SSuresh Siddha clear_cpu_sibling_map(int cpu) 578e927ecb0SSuresh Siddha { 579e927ecb0SSuresh Siddha int i; 580e927ecb0SSuresh Siddha 5815d2068daSRusty Russell for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu)) 5825d2068daSRusty Russell cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, i)); 5835d2068daSRusty Russell for_each_cpu(i, &cpu_core_map[cpu]) 5845d2068daSRusty Russell cpumask_clear_cpu(cpu, &cpu_core_map[i]); 585e927ecb0SSuresh Siddha 586d5a7430dSMike Travis per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE; 587e927ecb0SSuresh Siddha } 588e927ecb0SSuresh Siddha 589e927ecb0SSuresh Siddha static void 590e927ecb0SSuresh Siddha remove_siblinginfo(int cpu) 591e927ecb0SSuresh Siddha { 592e927ecb0SSuresh Siddha int last = 0; 593e927ecb0SSuresh Siddha 594e927ecb0SSuresh Siddha if (cpu_data(cpu)->threads_per_core == 1 && 595e927ecb0SSuresh Siddha cpu_data(cpu)->cores_per_socket == 1) { 5965d2068daSRusty Russell cpumask_clear_cpu(cpu, &cpu_core_map[cpu]); 5975d2068daSRusty Russell cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); 598e927ecb0SSuresh Siddha return; 599e927ecb0SSuresh Siddha } 600e927ecb0SSuresh Siddha 6015d2068daSRusty Russell last = (cpumask_weight(&cpu_core_map[cpu]) == 1 ? 1 : 0); 602e927ecb0SSuresh Siddha 603e927ecb0SSuresh Siddha /* remove it from all sibling map's */ 604e927ecb0SSuresh Siddha clear_cpu_sibling_map(cpu); 605e927ecb0SSuresh Siddha } 606e927ecb0SSuresh Siddha 6071da177e4SLinus Torvalds extern void fixup_irqs(void); 608ff741906SAshok Raj 609ff741906SAshok Raj int migrate_platform_irqs(unsigned int cpu) 610ff741906SAshok Raj { 611ff741906SAshok Raj int new_cpei_cpu; 612097e98b4SThomas Gleixner struct irq_data *data = NULL; 6130de26520SRusty Russell const struct cpumask *mask; 614ff741906SAshok Raj int retval = 0; 615ff741906SAshok Raj 616ff741906SAshok Raj /* 617ff741906SAshok Raj * dont permit CPEI target to removed. 618ff741906SAshok Raj */ 619ff741906SAshok Raj if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { 620ff741906SAshok Raj printk ("CPU (%d) is CPEI Target\n", cpu); 621ff741906SAshok Raj if (can_cpei_retarget()) { 622ff741906SAshok Raj /* 623ff741906SAshok Raj * Now re-target the CPEI to a different processor 624ff741906SAshok Raj */ 6257d7f9848SSrivatsa S. Bhat new_cpei_cpu = cpumask_any(cpu_online_mask); 6260de26520SRusty Russell mask = cpumask_of(new_cpei_cpu); 627ff741906SAshok Raj set_cpei_target_cpu(new_cpei_cpu); 628097e98b4SThomas Gleixner data = irq_get_irq_data(ia64_cpe_irq); 629ff741906SAshok Raj /* 63072fdbdceSSimon Arlott * Switch for now, immediately, we need to do fake intr 631ff741906SAshok Raj * as other interrupts, but need to study CPEI behaviour with 632ff741906SAshok Raj * polling before making changes. 633ff741906SAshok Raj */ 634097e98b4SThomas Gleixner if (data && data->chip) { 635097e98b4SThomas Gleixner data->chip->irq_disable(data); 636097e98b4SThomas Gleixner data->chip->irq_set_affinity(data, mask, false); 637097e98b4SThomas Gleixner data->chip->irq_enable(data); 63825985edcSLucas De Marchi printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu); 639ff741906SAshok Raj } 640ff741906SAshok Raj } 641097e98b4SThomas Gleixner if (!data) { 642ff741906SAshok Raj printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); 643ff741906SAshok Raj retval = -EBUSY; 644ff741906SAshok Raj } 645ff741906SAshok Raj } 646ff741906SAshok Raj return retval; 647ff741906SAshok Raj } 648ff741906SAshok Raj 6491da177e4SLinus Torvalds /* must be called with cpucontrol mutex held */ 6501da177e4SLinus Torvalds int __cpu_disable(void) 6511da177e4SLinus Torvalds { 6521da177e4SLinus Torvalds int cpu = smp_processor_id(); 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvalds /* 6551da177e4SLinus Torvalds * dont permit boot processor for now 6561da177e4SLinus Torvalds */ 657ff741906SAshok Raj if (cpu == 0 && !bsp_remove_ok) { 658ff741906SAshok Raj printk ("Your platform does not support removal of BSP\n"); 659ff741906SAshok Raj return (-EBUSY); 660ff741906SAshok Raj } 661ff741906SAshok Raj 6626e9de181SJohn Keller if (ia64_platform_is("sn2")) { 6636e9de181SJohn Keller if (!sn_cpu_disable_allowed(cpu)) 6646e9de181SJohn Keller return -EBUSY; 6656e9de181SJohn Keller } 6666e9de181SJohn Keller 6677d7f9848SSrivatsa S. Bhat set_cpu_online(cpu, false); 66866db2e63SAlex Chiang 669ff741906SAshok Raj if (migrate_platform_irqs(cpu)) { 6707d7f9848SSrivatsa S. Bhat set_cpu_online(cpu, true); 671c0acdea2SAlex Chiang return -EBUSY; 672ff741906SAshok Raj } 6731da177e4SLinus Torvalds 674e927ecb0SSuresh Siddha remove_siblinginfo(cpu); 67566db2e63SAlex Chiang fixup_irqs(); 6761da177e4SLinus Torvalds local_flush_tlb_all(); 6775d2068daSRusty Russell cpumask_clear_cpu(cpu, &cpu_callin_map); 6781da177e4SLinus Torvalds return 0; 6791da177e4SLinus Torvalds } 6801da177e4SLinus Torvalds 6811da177e4SLinus Torvalds void __cpu_die(unsigned int cpu) 6821da177e4SLinus Torvalds { 6831da177e4SLinus Torvalds unsigned int i; 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds for (i = 0; i < 100; i++) { 6861da177e4SLinus Torvalds /* They ack this in play_dead by setting CPU_DEAD */ 6871da177e4SLinus Torvalds if (per_cpu(cpu_state, cpu) == CPU_DEAD) 6881da177e4SLinus Torvalds { 689b8d8b883SAshok Raj printk ("CPU %d is now offline\n", cpu); 6901da177e4SLinus Torvalds return; 6911da177e4SLinus Torvalds } 6921da177e4SLinus Torvalds msleep(100); 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds printk(KERN_ERR "CPU %u didn't die...\n", cpu); 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds #endif /* CONFIG_HOTPLUG_CPU */ 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds void 6991da177e4SLinus Torvalds smp_cpus_done (unsigned int dummy) 7001da177e4SLinus Torvalds { 7011da177e4SLinus Torvalds int cpu; 7021da177e4SLinus Torvalds unsigned long bogosum = 0; 7031da177e4SLinus Torvalds 7041da177e4SLinus Torvalds /* 7051da177e4SLinus Torvalds * Allow the user to impress friends. 7061da177e4SLinus Torvalds */ 7071da177e4SLinus Torvalds 708dc565b52Shawkes@sgi.com for_each_online_cpu(cpu) { 7091da177e4SLinus Torvalds bogosum += cpu_data(cpu)->loops_per_jiffy; 710dc565b52Shawkes@sgi.com } 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", 7131da177e4SLinus Torvalds (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); 7141da177e4SLinus Torvalds } 7151da177e4SLinus Torvalds 7165b5e76e9SGreg Kroah-Hartman static inline void set_cpu_sibling_map(int cpu) 717e927ecb0SSuresh Siddha { 718e927ecb0SSuresh Siddha int i; 719e927ecb0SSuresh Siddha 720e927ecb0SSuresh Siddha for_each_online_cpu(i) { 721e927ecb0SSuresh Siddha if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { 7225d2068daSRusty Russell cpumask_set_cpu(i, &cpu_core_map[cpu]); 7235d2068daSRusty Russell cpumask_set_cpu(cpu, &cpu_core_map[i]); 724e927ecb0SSuresh Siddha if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { 7255d2068daSRusty Russell cpumask_set_cpu(i, 7265d2068daSRusty Russell &per_cpu(cpu_sibling_map, cpu)); 7275d2068daSRusty Russell cpumask_set_cpu(cpu, 7285d2068daSRusty Russell &per_cpu(cpu_sibling_map, i)); 729e927ecb0SSuresh Siddha } 730e927ecb0SSuresh Siddha } 731e927ecb0SSuresh Siddha } 732e927ecb0SSuresh Siddha } 733e927ecb0SSuresh Siddha 734ccce9bb8SPaul Gortmaker int 7358239c25fSThomas Gleixner __cpu_up(unsigned int cpu, struct task_struct *tidle) 7361da177e4SLinus Torvalds { 7371da177e4SLinus Torvalds int ret; 7381da177e4SLinus Torvalds int sapicid; 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvalds sapicid = ia64_cpu_to_sapicid[cpu]; 7411da177e4SLinus Torvalds if (sapicid == -1) 7421da177e4SLinus Torvalds return -EINVAL; 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds /* 745b8d8b883SAshok Raj * Already booted cpu? not valid anymore since we dont 746b8d8b883SAshok Raj * do idle loop tightspin anymore. 7471da177e4SLinus Torvalds */ 7485d2068daSRusty Russell if (cpumask_test_cpu(cpu, &cpu_callin_map)) 749b8d8b883SAshok Raj return -EINVAL; 750b8d8b883SAshok Raj 751a9fa06c2SShaohua Li per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; 7521da177e4SLinus Torvalds /* Processor goes to start_secondary(), sets online flag */ 75313583bf1SThomas Gleixner ret = do_boot_cpu(sapicid, cpu, tidle); 7541da177e4SLinus Torvalds if (ret < 0) 7551da177e4SLinus Torvalds return ret; 7561da177e4SLinus Torvalds 757e927ecb0SSuresh Siddha if (cpu_data(cpu)->threads_per_core == 1 && 758e927ecb0SSuresh Siddha cpu_data(cpu)->cores_per_socket == 1) { 7595d2068daSRusty Russell cpumask_set_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); 7605d2068daSRusty Russell cpumask_set_cpu(cpu, &cpu_core_map[cpu]); 761e927ecb0SSuresh Siddha return 0; 762e927ecb0SSuresh Siddha } 763e927ecb0SSuresh Siddha 764e927ecb0SSuresh Siddha set_cpu_sibling_map(cpu); 765e927ecb0SSuresh Siddha 7661da177e4SLinus Torvalds return 0; 7671da177e4SLinus Torvalds } 7681da177e4SLinus Torvalds 7691da177e4SLinus Torvalds /* 77072fdbdceSSimon Arlott * Assume that CPUs have been discovered by some platform-dependent interface. For 7711da177e4SLinus Torvalds * SoftSDV/Lion, that would be ACPI. 7721da177e4SLinus Torvalds * 7731da177e4SLinus Torvalds * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). 7741da177e4SLinus Torvalds */ 7751da177e4SLinus Torvalds void __init 7761da177e4SLinus Torvalds init_smp_config(void) 7771da177e4SLinus Torvalds { 7781da177e4SLinus Torvalds struct fptr { 7791da177e4SLinus Torvalds unsigned long fp; 7801da177e4SLinus Torvalds unsigned long gp; 7811da177e4SLinus Torvalds } *ap_startup; 7821da177e4SLinus Torvalds long sal_ret; 7831da177e4SLinus Torvalds 78472fdbdceSSimon Arlott /* Tell SAL where to drop the APs. */ 7851da177e4SLinus Torvalds ap_startup = (struct fptr *) start_ap; 7861da177e4SLinus Torvalds sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, 7871da177e4SLinus Torvalds ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); 7881da177e4SLinus Torvalds if (sal_ret < 0) 7891da177e4SLinus Torvalds printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", 7901da177e4SLinus Torvalds ia64_sal_strerror(sal_ret)); 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 793e927ecb0SSuresh Siddha /* 794e927ecb0SSuresh Siddha * identify_siblings(cpu) gets called from identify_cpu. This populates the 795e927ecb0SSuresh Siddha * information related to logical execution units in per_cpu_data structure. 796e927ecb0SSuresh Siddha */ 7975b5e76e9SGreg Kroah-Hartman void identify_siblings(struct cpuinfo_ia64 *c) 798e927ecb0SSuresh Siddha { 799e088a4adSMatthew Wilcox long status; 800e927ecb0SSuresh Siddha u16 pltid; 801e927ecb0SSuresh Siddha pal_logical_to_physical_t info; 802e927ecb0SSuresh Siddha 8036ff0bc94SAlex Chiang status = ia64_pal_logical_to_phys(-1, &info); 8046ff0bc94SAlex Chiang if (status != PAL_STATUS_SUCCESS) { 805113134fcSAlex Chiang if (status != PAL_STATUS_UNIMPLEMENTED) { 806113134fcSAlex Chiang printk(KERN_ERR 807113134fcSAlex Chiang "ia64_pal_logical_to_phys failed with %ld\n", 808e927ecb0SSuresh Siddha status); 809e927ecb0SSuresh Siddha return; 810e927ecb0SSuresh Siddha } 811113134fcSAlex Chiang 812113134fcSAlex Chiang info.overview_ppid = 0; 813113134fcSAlex Chiang info.overview_cpp = 1; 814113134fcSAlex Chiang info.overview_tpc = 1; 815113134fcSAlex Chiang } 8166ff0bc94SAlex Chiang 8176ff0bc94SAlex Chiang status = ia64_sal_physical_id_info(&pltid); 8186ff0bc94SAlex Chiang if (status != PAL_STATUS_SUCCESS) { 8196ff0bc94SAlex Chiang if (status != PAL_STATUS_UNIMPLEMENTED) 8206ff0bc94SAlex Chiang printk(KERN_ERR 8216ff0bc94SAlex Chiang "ia64_sal_pltid failed with %ld\n", 8226ff0bc94SAlex Chiang status); 823e927ecb0SSuresh Siddha return; 824e927ecb0SSuresh Siddha } 825e927ecb0SSuresh Siddha 826e927ecb0SSuresh Siddha c->socket_id = (pltid << 8) | info.overview_ppid; 827113134fcSAlex Chiang 828113134fcSAlex Chiang if (info.overview_cpp == 1 && info.overview_tpc == 1) 829113134fcSAlex Chiang return; 830113134fcSAlex Chiang 831e927ecb0SSuresh Siddha c->cores_per_socket = info.overview_cpp; 832e927ecb0SSuresh Siddha c->threads_per_core = info.overview_tpc; 8334129a953SFenghua Yu c->num_log = info.overview_num_log; 834e927ecb0SSuresh Siddha 835e927ecb0SSuresh Siddha c->core_id = info.log1_cid; 836e927ecb0SSuresh Siddha c->thread_id = info.log1_tid; 837e927ecb0SSuresh Siddha } 838dd562c05SStephane Eranian 839dd562c05SStephane Eranian /* 840dd562c05SStephane Eranian * returns non zero, if multi-threading is enabled 841dd562c05SStephane Eranian * on at least one physical package. Due to hotplug cpu 842dd562c05SStephane Eranian * and (maxcpus=), all threads may not necessarily be enabled 843dd562c05SStephane Eranian * even though the processor supports multi-threading. 844dd562c05SStephane Eranian */ 845dd562c05SStephane Eranian int is_multithreading_enabled(void) 846dd562c05SStephane Eranian { 847dd562c05SStephane Eranian int i, j; 848dd562c05SStephane Eranian 849dd562c05SStephane Eranian for_each_present_cpu(i) { 850dd562c05SStephane Eranian for_each_present_cpu(j) { 851dd562c05SStephane Eranian if (j == i) 852dd562c05SStephane Eranian continue; 853dd562c05SStephane Eranian if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { 854dd562c05SStephane Eranian if (cpu_data(j)->core_id == cpu_data(i)->core_id) 855dd562c05SStephane Eranian return 1; 856dd562c05SStephane Eranian } 857dd562c05SStephane Eranian } 858dd562c05SStephane Eranian } 859dd562c05SStephane Eranian return 0; 860dd562c05SStephane Eranian } 861dd562c05SStephane Eranian EXPORT_SYMBOL_GPL(is_multithreading_enabled); 862