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 431da177e4SLinus Torvalds #include <asm/atomic.h> 441da177e4SLinus Torvalds #include <asm/cache.h> 451da177e4SLinus Torvalds #include <asm/current.h> 461da177e4SLinus Torvalds #include <asm/delay.h> 471da177e4SLinus Torvalds #include <asm/ia32.h> 481da177e4SLinus Torvalds #include <asm/io.h> 491da177e4SLinus Torvalds #include <asm/irq.h> 501da177e4SLinus Torvalds #include <asm/machvec.h> 511da177e4SLinus Torvalds #include <asm/mca.h> 521da177e4SLinus Torvalds #include <asm/page.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/system.h> 591da177e4SLinus Torvalds #include <asm/tlbflush.h> 601da177e4SLinus Torvalds #include <asm/unistd.h> 616e9de181SJohn Keller #include <asm/sn/arch.h> 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds #define SMP_DEBUG 0 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds #if SMP_DEBUG 661da177e4SLinus Torvalds #define Dprintk(x...) printk(x) 671da177e4SLinus Torvalds #else 681da177e4SLinus Torvalds #define Dprintk(x...) 691da177e4SLinus Torvalds #endif 701da177e4SLinus Torvalds 71b8d8b883SAshok Raj #ifdef CONFIG_HOTPLUG_CPU 72ff741906SAshok Raj #ifdef CONFIG_PERMIT_BSP_REMOVE 73ff741906SAshok Raj #define bsp_remove_ok 1 74ff741906SAshok Raj #else 75ff741906SAshok Raj #define bsp_remove_ok 0 76ff741906SAshok Raj #endif 77ff741906SAshok Raj 78b8d8b883SAshok Raj /* 79b8d8b883SAshok Raj * Store all idle threads, this can be reused instead of creating 80b8d8b883SAshok Raj * a new thread. Also avoids complicated thread destroy functionality 81b8d8b883SAshok Raj * for idle threads. 82b8d8b883SAshok Raj */ 83b8d8b883SAshok Raj struct task_struct *idle_thread_array[NR_CPUS]; 84b8d8b883SAshok Raj 85b8d8b883SAshok Raj /* 86b8d8b883SAshok Raj * Global array allocated for NR_CPUS at boot time 87b8d8b883SAshok Raj */ 88b8d8b883SAshok Raj struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS]; 89b8d8b883SAshok Raj 90b8d8b883SAshok Raj /* 91b8d8b883SAshok Raj * start_ap in head.S uses this to store current booting cpu 92b8d8b883SAshok Raj * info. 93b8d8b883SAshok Raj */ 94b8d8b883SAshok Raj struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0]; 95b8d8b883SAshok Raj 96b8d8b883SAshok Raj #define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]); 97b8d8b883SAshok Raj 98b8d8b883SAshok Raj #define get_idle_for_cpu(x) (idle_thread_array[(x)]) 99b8d8b883SAshok Raj #define set_idle_for_cpu(x,p) (idle_thread_array[(x)] = (p)) 100b8d8b883SAshok Raj 101b8d8b883SAshok Raj #else 102b8d8b883SAshok Raj 103b8d8b883SAshok Raj #define get_idle_for_cpu(x) (NULL) 104b8d8b883SAshok Raj #define set_idle_for_cpu(x,p) 105b8d8b883SAshok Raj #define set_brendez_area(x) 106b8d8b883SAshok Raj #endif 107b8d8b883SAshok Raj 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds /* 1101da177e4SLinus Torvalds * ITC synchronization related stuff: 1111da177e4SLinus Torvalds */ 112ff741906SAshok Raj #define MASTER (0) 1131da177e4SLinus Torvalds #define SLAVE (SMP_CACHE_BYTES/8) 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds #define NUM_ROUNDS 64 /* magic value */ 1161da177e4SLinus Torvalds #define NUM_ITERS 5 /* likewise */ 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds static DEFINE_SPINLOCK(itc_sync_lock); 1191da177e4SLinus Torvalds static volatile unsigned long go[SLAVE + 1]; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds #define DEBUG_ITC_SYNC 0 1221da177e4SLinus Torvalds 1231da177e4SLinus Torvalds extern void start_ap (void); 1241da177e4SLinus Torvalds extern unsigned long ia64_iobase; 1251da177e4SLinus Torvalds 12636c8b586SIngo Molnar struct task_struct *task_for_booting_cpu; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* 1291da177e4SLinus Torvalds * State for each CPU 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds DEFINE_PER_CPU(int, cpu_state); 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds /* Bitmasks of currently online, and possible CPUs */ 1341da177e4SLinus Torvalds cpumask_t cpu_online_map; 1351da177e4SLinus Torvalds EXPORT_SYMBOL(cpu_online_map); 13669aa234bSAshok Raj cpumask_t cpu_possible_map = CPU_MASK_NONE; 1371da177e4SLinus Torvalds EXPORT_SYMBOL(cpu_possible_map); 1381da177e4SLinus Torvalds 139e927ecb0SSuresh Siddha cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; 140d5a7430dSMike Travis DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); 141d5a7430dSMike Travis EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); 142d5a7430dSMike Travis 143e927ecb0SSuresh Siddha int smp_num_siblings = 1; 144e927ecb0SSuresh Siddha 1451da177e4SLinus Torvalds /* which logical CPU number maps to which CPU (physical APIC ID) */ 1461da177e4SLinus Torvalds volatile int ia64_cpu_to_sapicid[NR_CPUS]; 1471da177e4SLinus Torvalds EXPORT_SYMBOL(ia64_cpu_to_sapicid); 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds static volatile cpumask_t cpu_callin_map; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds struct smp_boot_data smp_boot_data __initdata; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds char __initdata no_int_routing; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ 1581da177e4SLinus Torvalds 159ff741906SAshok Raj #ifdef CONFIG_FORCE_CPEI_RETARGET 160ff741906SAshok Raj #define CPEI_OVERRIDE_DEFAULT (1) 161ff741906SAshok Raj #else 162ff741906SAshok Raj #define CPEI_OVERRIDE_DEFAULT (0) 163ff741906SAshok Raj #endif 164ff741906SAshok Raj 165ff741906SAshok Raj unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; 166ff741906SAshok Raj 167ff741906SAshok Raj static int __init 168ff741906SAshok Raj cmdl_force_cpei(char *str) 169ff741906SAshok Raj { 170ff741906SAshok Raj int value=0; 171ff741906SAshok Raj 172ff741906SAshok Raj get_option (&str, &value); 173ff741906SAshok Raj force_cpei_retarget = value; 174ff741906SAshok Raj 175ff741906SAshok Raj return 1; 176ff741906SAshok Raj } 177ff741906SAshok Raj 178ff741906SAshok Raj __setup("force_cpei=", cmdl_force_cpei); 179ff741906SAshok Raj 1801da177e4SLinus Torvalds static int __init 1811da177e4SLinus Torvalds nointroute (char *str) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds no_int_routing = 1; 1841da177e4SLinus Torvalds printk ("no_int_routing on\n"); 1851da177e4SLinus Torvalds return 1; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds __setup("nointroute", nointroute); 1891da177e4SLinus Torvalds 190ff741906SAshok Raj static void fix_b0_for_bsp(void) 191ff741906SAshok Raj { 192ff741906SAshok Raj #ifdef CONFIG_HOTPLUG_CPU 193ff741906SAshok Raj int cpuid; 194ff741906SAshok Raj static int fix_bsp_b0 = 1; 195ff741906SAshok Raj 196ff741906SAshok Raj cpuid = smp_processor_id(); 197ff741906SAshok Raj 198ff741906SAshok Raj /* 199ff741906SAshok Raj * Cache the b0 value on the first AP that comes up 200ff741906SAshok Raj */ 201ff741906SAshok Raj if (!(fix_bsp_b0 && cpuid)) 202ff741906SAshok Raj return; 203ff741906SAshok Raj 204ff741906SAshok Raj sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0]; 205ff741906SAshok Raj printk ("Fixed BSP b0 value from CPU %d\n", cpuid); 206ff741906SAshok Raj 207ff741906SAshok Raj fix_bsp_b0 = 0; 208ff741906SAshok Raj #endif 209ff741906SAshok Raj } 210ff741906SAshok Raj 2111da177e4SLinus Torvalds void 2121da177e4SLinus Torvalds sync_master (void *arg) 2131da177e4SLinus Torvalds { 2141da177e4SLinus Torvalds unsigned long flags, i; 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds go[MASTER] = 0; 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds local_irq_save(flags); 2191da177e4SLinus Torvalds { 2201da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) { 22182975115SDavid Mosberger-Tang while (!go[MASTER]) 22282975115SDavid Mosberger-Tang cpu_relax(); 2231da177e4SLinus Torvalds go[MASTER] = 0; 2241da177e4SLinus Torvalds go[SLAVE] = ia64_get_itc(); 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds local_irq_restore(flags); 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds /* 2311da177e4SLinus Torvalds * Return the number of cycles by which our itc differs from the itc on the master 2321da177e4SLinus Torvalds * (time-keeper) CPU. A positive number indicates our itc is ahead of the master, 2331da177e4SLinus Torvalds * negative that it is behind. 2341da177e4SLinus Torvalds */ 2351da177e4SLinus Torvalds static inline long 2361da177e4SLinus Torvalds get_delta (long *rt, long *master) 2371da177e4SLinus Torvalds { 2381da177e4SLinus Torvalds unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; 2391da177e4SLinus Torvalds unsigned long tcenter, t0, t1, tm; 2401da177e4SLinus Torvalds long i; 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvalds for (i = 0; i < NUM_ITERS; ++i) { 2431da177e4SLinus Torvalds t0 = ia64_get_itc(); 2441da177e4SLinus Torvalds go[MASTER] = 1; 24582975115SDavid Mosberger-Tang while (!(tm = go[SLAVE])) 24682975115SDavid Mosberger-Tang cpu_relax(); 2471da177e4SLinus Torvalds go[SLAVE] = 0; 2481da177e4SLinus Torvalds t1 = ia64_get_itc(); 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds if (t1 - t0 < best_t1 - best_t0) 2511da177e4SLinus Torvalds best_t0 = t0, best_t1 = t1, best_tm = tm; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds *rt = best_t1 - best_t0; 2551da177e4SLinus Torvalds *master = best_tm - best_t0; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds /* average best_t0 and best_t1 without overflow: */ 2581da177e4SLinus Torvalds tcenter = (best_t0/2 + best_t1/2); 2591da177e4SLinus Torvalds if (best_t0 % 2 + best_t1 % 2 == 2) 2601da177e4SLinus Torvalds ++tcenter; 2611da177e4SLinus Torvalds return tcenter - best_tm; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds /* 2651da177e4SLinus Torvalds * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU 2661da177e4SLinus Torvalds * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of 2671da177e4SLinus Torvalds * unaccounted-for errors (such as getting a machine check in the middle of a calibration 2681da177e4SLinus Torvalds * step). The basic idea is for the slave to ask the master what itc value it has and to 2691da177e4SLinus Torvalds * read its own itc before and after the master responds. Each iteration gives us three 2701da177e4SLinus Torvalds * timestamps: 2711da177e4SLinus Torvalds * 2721da177e4SLinus Torvalds * slave master 2731da177e4SLinus Torvalds * 2741da177e4SLinus Torvalds * t0 ---\ 2751da177e4SLinus Torvalds * ---\ 2761da177e4SLinus Torvalds * ---> 2771da177e4SLinus Torvalds * tm 2781da177e4SLinus Torvalds * /--- 2791da177e4SLinus Torvalds * /--- 2801da177e4SLinus Torvalds * t1 <--- 2811da177e4SLinus Torvalds * 2821da177e4SLinus Torvalds * 2831da177e4SLinus Torvalds * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0 2841da177e4SLinus Torvalds * and t1. If we achieve this, the clocks are synchronized provided the interconnect 2851da177e4SLinus Torvalds * between the slave and the master is symmetric. Even if the interconnect were 2861da177e4SLinus Torvalds * asymmetric, we would still know that the synchronization error is smaller than the 2871da177e4SLinus Torvalds * roundtrip latency (t0 - t1). 2881da177e4SLinus Torvalds * 2891da177e4SLinus Torvalds * When the interconnect is quiet and symmetric, this lets us synchronize the itc to 2901da177e4SLinus Torvalds * within one or two cycles. However, we can only *guarantee* that the synchronization is 2911da177e4SLinus Torvalds * accurate to within a round-trip time, which is typically in the range of several 2921da177e4SLinus Torvalds * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually 2931da177e4SLinus Torvalds * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better 2941da177e4SLinus Torvalds * than half a micro second or so. 2951da177e4SLinus Torvalds */ 2961da177e4SLinus Torvalds void 2971da177e4SLinus Torvalds ia64_sync_itc (unsigned int master) 2981da177e4SLinus Torvalds { 2991da177e4SLinus Torvalds long i, delta, adj, adjust_latency = 0, done = 0; 3001da177e4SLinus Torvalds unsigned long flags, rt, master_time_stamp, bound; 3011da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3021da177e4SLinus Torvalds struct { 3031da177e4SLinus Torvalds long rt; /* roundtrip time */ 3041da177e4SLinus Torvalds long master; /* master's timestamp */ 3051da177e4SLinus Torvalds long diff; /* difference between midpoint and master's timestamp */ 3061da177e4SLinus Torvalds long lat; /* estimate of itc adjustment latency */ 3071da177e4SLinus Torvalds } t[NUM_ROUNDS]; 3081da177e4SLinus Torvalds #endif 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds /* 3111da177e4SLinus Torvalds * Make sure local timer ticks are disabled while we sync. If 3121da177e4SLinus Torvalds * they were enabled, we'd have to worry about nasty issues 3131da177e4SLinus Torvalds * like setting the ITC ahead of (or a long time before) the 3141da177e4SLinus Torvalds * next scheduled tick. 3151da177e4SLinus Torvalds */ 3161da177e4SLinus Torvalds BUG_ON((ia64_get_itv() & (1 << 16)) == 0); 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvalds go[MASTER] = 1; 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvalds if (smp_call_function_single(master, sync_master, NULL, 1, 0) < 0) { 3211da177e4SLinus Torvalds printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); 3221da177e4SLinus Torvalds return; 3231da177e4SLinus Torvalds } 3241da177e4SLinus Torvalds 32582975115SDavid Mosberger-Tang while (go[MASTER]) 32682975115SDavid Mosberger-Tang cpu_relax(); /* wait for master to be ready */ 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds spin_lock_irqsave(&itc_sync_lock, flags); 3291da177e4SLinus Torvalds { 3301da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS; ++i) { 3311da177e4SLinus Torvalds delta = get_delta(&rt, &master_time_stamp); 3321da177e4SLinus Torvalds if (delta == 0) { 3331da177e4SLinus Torvalds done = 1; /* let's lock on to this... */ 3341da177e4SLinus Torvalds bound = rt; 3351da177e4SLinus Torvalds } 3361da177e4SLinus Torvalds 3371da177e4SLinus Torvalds if (!done) { 3381da177e4SLinus Torvalds if (i > 0) { 3391da177e4SLinus Torvalds adjust_latency += -delta; 3401da177e4SLinus Torvalds adj = -delta + adjust_latency/4; 3411da177e4SLinus Torvalds } else 3421da177e4SLinus Torvalds adj = -delta; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds ia64_set_itc(ia64_get_itc() + adj); 3451da177e4SLinus Torvalds } 3461da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3471da177e4SLinus Torvalds t[i].rt = rt; 3481da177e4SLinus Torvalds t[i].master = master_time_stamp; 3491da177e4SLinus Torvalds t[i].diff = delta; 3501da177e4SLinus Torvalds t[i].lat = adjust_latency/4; 3511da177e4SLinus Torvalds #endif 3521da177e4SLinus Torvalds } 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds spin_unlock_irqrestore(&itc_sync_lock, flags); 3551da177e4SLinus Torvalds 3561da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3571da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS; ++i) 3581da177e4SLinus Torvalds printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", 3591da177e4SLinus Torvalds t[i].rt, t[i].master, t[i].diff, t[i].lat); 3601da177e4SLinus Torvalds #endif 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, " 3631da177e4SLinus Torvalds "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt); 3641da177e4SLinus Torvalds } 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds /* 3671da177e4SLinus Torvalds * Ideally sets up per-cpu profiling hooks. Doesn't do much now... 3681da177e4SLinus Torvalds */ 3691da177e4SLinus Torvalds static inline void __devinit 3701da177e4SLinus Torvalds smp_setup_percpu_timer (void) 3711da177e4SLinus Torvalds { 3721da177e4SLinus Torvalds } 3731da177e4SLinus Torvalds 374d86ebd14STony Luck static void __cpuinit 3751da177e4SLinus Torvalds smp_callin (void) 3761da177e4SLinus Torvalds { 377ff741906SAshok Raj int cpuid, phys_id, itc_master; 378ead6caaeSJack Steiner struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; 3791da177e4SLinus Torvalds extern void ia64_init_itm(void); 380ff741906SAshok Raj extern volatile int time_keeper_id; 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds #ifdef CONFIG_PERFMON 3831da177e4SLinus Torvalds extern void pfm_init_percpu(void); 3841da177e4SLinus Torvalds #endif 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds cpuid = smp_processor_id(); 3871da177e4SLinus Torvalds phys_id = hard_smp_processor_id(); 388ff741906SAshok Raj itc_master = time_keeper_id; 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds if (cpu_online(cpuid)) { 3911da177e4SLinus Torvalds printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n", 3921da177e4SLinus Torvalds phys_id, cpuid); 3931da177e4SLinus Torvalds BUG(); 3941da177e4SLinus Torvalds } 3951da177e4SLinus Torvalds 396ff741906SAshok Raj fix_b0_for_bsp(); 397ff741906SAshok Raj 3981da177e4SLinus Torvalds lock_ipi_calllock(); 399e1b30a39SYasuaki Ishimatsu spin_lock(&vector_lock); 400e1b30a39SYasuaki Ishimatsu /* Setup the per cpu irq handling data structures */ 401e1b30a39SYasuaki Ishimatsu __setup_vector_irq(cpuid); 4021da177e4SLinus Torvalds cpu_set(cpuid, cpu_online_map); 403a9fa06c2SShaohua Li per_cpu(cpu_state, cpuid) = CPU_ONLINE; 404e1b30a39SYasuaki Ishimatsu spin_unlock(&vector_lock); 405e9145016SAlan D. Brunelle unlock_ipi_calllock(); 4061da177e4SLinus Torvalds 4071da177e4SLinus Torvalds smp_setup_percpu_timer(); 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds #ifdef CONFIG_PERFMON 4121da177e4SLinus Torvalds pfm_init_percpu(); 4131da177e4SLinus Torvalds #endif 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds local_irq_enable(); 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) { 4181da177e4SLinus Torvalds /* 4191da177e4SLinus Torvalds * Synchronize the ITC with the BP. Need to do this after irqs are 4201da177e4SLinus Torvalds * enabled because ia64_sync_itc() calls smp_call_function_single(), which 4211da177e4SLinus Torvalds * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls 4221da177e4SLinus Torvalds * local_bh_enable(), which bugs out if irqs are not enabled... 4231da177e4SLinus Torvalds */ 424ff741906SAshok Raj Dprintk("Going to syncup ITC with ITC Master.\n"); 425ff741906SAshok Raj ia64_sync_itc(itc_master); 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds /* 4291da177e4SLinus Torvalds * Get our bogomips. 4301da177e4SLinus Torvalds */ 4311da177e4SLinus Torvalds ia64_init_itm(); 432ead6caaeSJack Steiner 433ead6caaeSJack Steiner /* 434ead6caaeSJack Steiner * Delay calibration can be skipped if new processor is identical to the 435ead6caaeSJack Steiner * previous processor. 436ead6caaeSJack Steiner */ 437ead6caaeSJack Steiner last_cpuinfo = cpu_data(cpuid - 1); 438ead6caaeSJack Steiner this_cpuinfo = local_cpu_data; 439ead6caaeSJack Steiner if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq || 440ead6caaeSJack Steiner last_cpuinfo->proc_freq != this_cpuinfo->proc_freq || 441ead6caaeSJack Steiner last_cpuinfo->features != this_cpuinfo->features || 442ead6caaeSJack Steiner last_cpuinfo->revision != this_cpuinfo->revision || 443ead6caaeSJack Steiner last_cpuinfo->family != this_cpuinfo->family || 444ead6caaeSJack Steiner last_cpuinfo->archrev != this_cpuinfo->archrev || 445ead6caaeSJack Steiner last_cpuinfo->model != this_cpuinfo->model) 4461da177e4SLinus Torvalds calibrate_delay(); 4471da177e4SLinus Torvalds local_cpu_data->loops_per_jiffy = loops_per_jiffy; 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds #ifdef CONFIG_IA32_SUPPORT 4501da177e4SLinus Torvalds ia32_gdt_init(); 4511da177e4SLinus Torvalds #endif 4521da177e4SLinus Torvalds 4531da177e4SLinus Torvalds /* 4541da177e4SLinus Torvalds * Allow the master to continue. 4551da177e4SLinus Torvalds */ 4561da177e4SLinus Torvalds cpu_set(cpuid, cpu_callin_map); 4571da177e4SLinus Torvalds Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid); 4581da177e4SLinus Torvalds } 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* 4621da177e4SLinus Torvalds * Activate a secondary processor. head.S calls this. 4631da177e4SLinus Torvalds */ 464d86ebd14STony Luck int __cpuinit 4651da177e4SLinus Torvalds start_secondary (void *unused) 4661da177e4SLinus Torvalds { 4671da177e4SLinus Torvalds /* Early console may use I/O ports */ 4681da177e4SLinus Torvalds ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); 4691da177e4SLinus Torvalds Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); 4701da177e4SLinus Torvalds efi_map_pal_code(); 4711da177e4SLinus Torvalds cpu_init(); 4725bfb5d69SNick Piggin preempt_disable(); 4731da177e4SLinus Torvalds smp_callin(); 4741da177e4SLinus Torvalds 4751da177e4SLinus Torvalds cpu_idle(); 4761da177e4SLinus Torvalds return 0; 4771da177e4SLinus Torvalds } 4781da177e4SLinus Torvalds 4796b2fb3c6SAdrian Bunk struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs) 4801da177e4SLinus Torvalds { 4811da177e4SLinus Torvalds return NULL; 4821da177e4SLinus Torvalds } 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds struct create_idle { 4856d5aefb8SDavid Howells struct work_struct work; 4861da177e4SLinus Torvalds struct task_struct *idle; 4871da177e4SLinus Torvalds struct completion done; 4881da177e4SLinus Torvalds int cpu; 4891da177e4SLinus Torvalds }; 4901da177e4SLinus Torvalds 4919d6f40b8STony Luck void __cpuinit 4926d5aefb8SDavid Howells do_fork_idle(struct work_struct *work) 4931da177e4SLinus Torvalds { 4946d5aefb8SDavid Howells struct create_idle *c_idle = 4956d5aefb8SDavid Howells container_of(work, struct create_idle, work); 4961da177e4SLinus Torvalds 4971da177e4SLinus Torvalds c_idle->idle = fork_idle(c_idle->cpu); 4981da177e4SLinus Torvalds complete(&c_idle->done); 4991da177e4SLinus Torvalds } 5001da177e4SLinus Torvalds 5019d6f40b8STony Luck static int __cpuinit 5021da177e4SLinus Torvalds do_boot_cpu (int sapicid, int cpu) 5031da177e4SLinus Torvalds { 5041da177e4SLinus Torvalds int timeout; 5051da177e4SLinus Torvalds struct create_idle c_idle = { 5066d5aefb8SDavid Howells .work = __WORK_INITIALIZER(c_idle.work, do_fork_idle), 5071da177e4SLinus Torvalds .cpu = cpu, 5081da177e4SLinus Torvalds .done = COMPLETION_INITIALIZER(c_idle.done), 5091da177e4SLinus Torvalds }; 510b8d8b883SAshok Raj 511b8d8b883SAshok Raj c_idle.idle = get_idle_for_cpu(cpu); 512b8d8b883SAshok Raj if (c_idle.idle) { 513b8d8b883SAshok Raj init_idle(c_idle.idle, cpu); 514b8d8b883SAshok Raj goto do_rest; 515b8d8b883SAshok Raj } 516b8d8b883SAshok Raj 5171da177e4SLinus Torvalds /* 5181da177e4SLinus Torvalds * We can't use kernel_thread since we must avoid to reschedule the child. 5191da177e4SLinus Torvalds */ 5201da177e4SLinus Torvalds if (!keventd_up() || current_is_keventd()) 5216d5aefb8SDavid Howells c_idle.work.func(&c_idle.work); 5221da177e4SLinus Torvalds else { 5236d5aefb8SDavid Howells schedule_work(&c_idle.work); 5241da177e4SLinus Torvalds wait_for_completion(&c_idle.done); 5251da177e4SLinus Torvalds } 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds if (IS_ERR(c_idle.idle)) 5281da177e4SLinus Torvalds panic("failed fork for CPU %d", cpu); 529b8d8b883SAshok Raj 530b8d8b883SAshok Raj set_idle_for_cpu(cpu, c_idle.idle); 531b8d8b883SAshok Raj 532b8d8b883SAshok Raj do_rest: 5331da177e4SLinus Torvalds task_for_booting_cpu = c_idle.idle; 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); 5361da177e4SLinus Torvalds 537b8d8b883SAshok Raj set_brendez_area(cpu); 5381da177e4SLinus Torvalds platform_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); 5391da177e4SLinus Torvalds 5401da177e4SLinus Torvalds /* 5411da177e4SLinus Torvalds * Wait 10s total for the AP to start 5421da177e4SLinus Torvalds */ 5431da177e4SLinus Torvalds Dprintk("Waiting on callin_map ..."); 5441da177e4SLinus Torvalds for (timeout = 0; timeout < 100000; timeout++) { 5451da177e4SLinus Torvalds if (cpu_isset(cpu, cpu_callin_map)) 5461da177e4SLinus Torvalds break; /* It has booted */ 5471da177e4SLinus Torvalds udelay(100); 5481da177e4SLinus Torvalds } 5491da177e4SLinus Torvalds Dprintk("\n"); 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds if (!cpu_isset(cpu, cpu_callin_map)) { 5521da177e4SLinus Torvalds printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); 5531da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = -1; 5541da177e4SLinus Torvalds cpu_clear(cpu, cpu_online_map); /* was set in smp_callin() */ 5551da177e4SLinus Torvalds return -EINVAL; 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds return 0; 5581da177e4SLinus Torvalds } 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds static int __init 5611da177e4SLinus Torvalds decay (char *str) 5621da177e4SLinus Torvalds { 5631da177e4SLinus Torvalds int ticks; 5641da177e4SLinus Torvalds get_option (&str, &ticks); 5651da177e4SLinus Torvalds return 1; 5661da177e4SLinus Torvalds } 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds __setup("decay=", decay); 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds /* 5711da177e4SLinus Torvalds * Initialize the logical CPU number to SAPICID mapping 5721da177e4SLinus Torvalds */ 5731da177e4SLinus Torvalds void __init 5741da177e4SLinus Torvalds smp_build_cpu_map (void) 5751da177e4SLinus Torvalds { 5761da177e4SLinus Torvalds int sapicid, cpu, i; 5771da177e4SLinus Torvalds int boot_cpu_id = hard_smp_processor_id(); 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds for (cpu = 0; cpu < NR_CPUS; cpu++) { 5801da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = -1; 5811da177e4SLinus Torvalds } 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds ia64_cpu_to_sapicid[0] = boot_cpu_id; 5841da177e4SLinus Torvalds cpus_clear(cpu_present_map); 5851da177e4SLinus Torvalds cpu_set(0, cpu_present_map); 5861da177e4SLinus Torvalds cpu_set(0, cpu_possible_map); 5871da177e4SLinus Torvalds for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { 5881da177e4SLinus Torvalds sapicid = smp_boot_data.cpu_phys_id[i]; 5891da177e4SLinus Torvalds if (sapicid == boot_cpu_id) 5901da177e4SLinus Torvalds continue; 5911da177e4SLinus Torvalds cpu_set(cpu, cpu_present_map); 5921da177e4SLinus Torvalds cpu_set(cpu, cpu_possible_map); 5931da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = sapicid; 5941da177e4SLinus Torvalds cpu++; 5951da177e4SLinus Torvalds } 5961da177e4SLinus Torvalds } 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds /* 5991da177e4SLinus Torvalds * Cycle through the APs sending Wakeup IPIs to boot each. 6001da177e4SLinus Torvalds */ 6011da177e4SLinus Torvalds void __init 6021da177e4SLinus Torvalds smp_prepare_cpus (unsigned int max_cpus) 6031da177e4SLinus Torvalds { 6041da177e4SLinus Torvalds int boot_cpu_id = hard_smp_processor_id(); 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvalds /* 6071da177e4SLinus Torvalds * Initialize the per-CPU profiling counter/multiplier 6081da177e4SLinus Torvalds */ 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvalds smp_setup_percpu_timer(); 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds /* 6131da177e4SLinus Torvalds * We have the boot CPU online for sure. 6141da177e4SLinus Torvalds */ 6151da177e4SLinus Torvalds cpu_set(0, cpu_online_map); 6161da177e4SLinus Torvalds cpu_set(0, cpu_callin_map); 6171da177e4SLinus Torvalds 6181da177e4SLinus Torvalds local_cpu_data->loops_per_jiffy = loops_per_jiffy; 6191da177e4SLinus Torvalds ia64_cpu_to_sapicid[0] = boot_cpu_id; 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds current_thread_info()->cpu = 0; 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds /* 6261da177e4SLinus Torvalds * If SMP should be disabled, then really disable it! 6271da177e4SLinus Torvalds */ 6281da177e4SLinus Torvalds if (!max_cpus) { 6291da177e4SLinus Torvalds printk(KERN_INFO "SMP mode deactivated.\n"); 6301da177e4SLinus Torvalds cpus_clear(cpu_online_map); 6311da177e4SLinus Torvalds cpus_clear(cpu_present_map); 6321da177e4SLinus Torvalds cpus_clear(cpu_possible_map); 6331da177e4SLinus Torvalds cpu_set(0, cpu_online_map); 6341da177e4SLinus Torvalds cpu_set(0, cpu_present_map); 6351da177e4SLinus Torvalds cpu_set(0, cpu_possible_map); 6361da177e4SLinus Torvalds return; 6371da177e4SLinus Torvalds } 6381da177e4SLinus Torvalds } 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds void __devinit smp_prepare_boot_cpu(void) 6411da177e4SLinus Torvalds { 6421da177e4SLinus Torvalds cpu_set(smp_processor_id(), cpu_online_map); 6431da177e4SLinus Torvalds cpu_set(smp_processor_id(), cpu_callin_map); 644a9fa06c2SShaohua Li per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; 6451da177e4SLinus Torvalds } 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds #ifdef CONFIG_HOTPLUG_CPU 648e927ecb0SSuresh Siddha static inline void 649e927ecb0SSuresh Siddha clear_cpu_sibling_map(int cpu) 650e927ecb0SSuresh Siddha { 651e927ecb0SSuresh Siddha int i; 652e927ecb0SSuresh Siddha 653d5a7430dSMike Travis for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) 654d5a7430dSMike Travis cpu_clear(cpu, per_cpu(cpu_sibling_map, i)); 655e927ecb0SSuresh Siddha for_each_cpu_mask(i, cpu_core_map[cpu]) 656e927ecb0SSuresh Siddha cpu_clear(cpu, cpu_core_map[i]); 657e927ecb0SSuresh Siddha 658d5a7430dSMike Travis per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE; 659e927ecb0SSuresh Siddha } 660e927ecb0SSuresh Siddha 661e927ecb0SSuresh Siddha static void 662e927ecb0SSuresh Siddha remove_siblinginfo(int cpu) 663e927ecb0SSuresh Siddha { 664e927ecb0SSuresh Siddha int last = 0; 665e927ecb0SSuresh Siddha 666e927ecb0SSuresh Siddha if (cpu_data(cpu)->threads_per_core == 1 && 667e927ecb0SSuresh Siddha cpu_data(cpu)->cores_per_socket == 1) { 668e927ecb0SSuresh Siddha cpu_clear(cpu, cpu_core_map[cpu]); 669d5a7430dSMike Travis cpu_clear(cpu, per_cpu(cpu_sibling_map, cpu)); 670e927ecb0SSuresh Siddha return; 671e927ecb0SSuresh Siddha } 672e927ecb0SSuresh Siddha 673e927ecb0SSuresh Siddha last = (cpus_weight(cpu_core_map[cpu]) == 1 ? 1 : 0); 674e927ecb0SSuresh Siddha 675e927ecb0SSuresh Siddha /* remove it from all sibling map's */ 676e927ecb0SSuresh Siddha clear_cpu_sibling_map(cpu); 677e927ecb0SSuresh Siddha } 678e927ecb0SSuresh Siddha 6791da177e4SLinus Torvalds extern void fixup_irqs(void); 680ff741906SAshok Raj 681ff741906SAshok Raj int migrate_platform_irqs(unsigned int cpu) 682ff741906SAshok Raj { 683ff741906SAshok Raj int new_cpei_cpu; 684ff741906SAshok Raj irq_desc_t *desc = NULL; 685ff741906SAshok Raj cpumask_t mask; 686ff741906SAshok Raj int retval = 0; 687ff741906SAshok Raj 688ff741906SAshok Raj /* 689ff741906SAshok Raj * dont permit CPEI target to removed. 690ff741906SAshok Raj */ 691ff741906SAshok Raj if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { 692ff741906SAshok Raj printk ("CPU (%d) is CPEI Target\n", cpu); 693ff741906SAshok Raj if (can_cpei_retarget()) { 694ff741906SAshok Raj /* 695ff741906SAshok Raj * Now re-target the CPEI to a different processor 696ff741906SAshok Raj */ 697ff741906SAshok Raj new_cpei_cpu = any_online_cpu(cpu_online_map); 698ff741906SAshok Raj mask = cpumask_of_cpu(new_cpei_cpu); 699ff741906SAshok Raj set_cpei_target_cpu(new_cpei_cpu); 700a8553acdSIngo Molnar desc = irq_desc + ia64_cpe_irq; 701ff741906SAshok Raj /* 70272fdbdceSSimon Arlott * Switch for now, immediately, we need to do fake intr 703ff741906SAshok Raj * as other interrupts, but need to study CPEI behaviour with 704ff741906SAshok Raj * polling before making changes. 705ff741906SAshok Raj */ 706ff741906SAshok Raj if (desc) { 707d1bef4edSIngo Molnar desc->chip->disable(ia64_cpe_irq); 708d1bef4edSIngo Molnar desc->chip->set_affinity(ia64_cpe_irq, mask); 709d1bef4edSIngo Molnar desc->chip->enable(ia64_cpe_irq); 710ff741906SAshok Raj printk ("Re-targetting CPEI to cpu %d\n", new_cpei_cpu); 711ff741906SAshok Raj } 712ff741906SAshok Raj } 713ff741906SAshok Raj if (!desc) { 714ff741906SAshok Raj printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); 715ff741906SAshok Raj retval = -EBUSY; 716ff741906SAshok Raj } 717ff741906SAshok Raj } 718ff741906SAshok Raj return retval; 719ff741906SAshok Raj } 720ff741906SAshok Raj 7211da177e4SLinus Torvalds /* must be called with cpucontrol mutex held */ 7221da177e4SLinus Torvalds int __cpu_disable(void) 7231da177e4SLinus Torvalds { 7241da177e4SLinus Torvalds int cpu = smp_processor_id(); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds /* 7271da177e4SLinus Torvalds * dont permit boot processor for now 7281da177e4SLinus Torvalds */ 729ff741906SAshok Raj if (cpu == 0 && !bsp_remove_ok) { 730ff741906SAshok Raj printk ("Your platform does not support removal of BSP\n"); 731ff741906SAshok Raj return (-EBUSY); 732ff741906SAshok Raj } 733ff741906SAshok Raj 7346e9de181SJohn Keller if (ia64_platform_is("sn2")) { 7356e9de181SJohn Keller if (!sn_cpu_disable_allowed(cpu)) 7366e9de181SJohn Keller return -EBUSY; 7376e9de181SJohn Keller } 7386e9de181SJohn Keller 739ff741906SAshok Raj cpu_clear(cpu, cpu_online_map); 740ff741906SAshok Raj 741ff741906SAshok Raj if (migrate_platform_irqs(cpu)) { 742ff741906SAshok Raj cpu_set(cpu, cpu_online_map); 743ff741906SAshok Raj return (-EBUSY); 744ff741906SAshok Raj } 7451da177e4SLinus Torvalds 746e927ecb0SSuresh Siddha remove_siblinginfo(cpu); 747f3705136SZwane Mwaikambo cpu_clear(cpu, cpu_online_map); 7481da177e4SLinus Torvalds fixup_irqs(); 7491da177e4SLinus Torvalds local_flush_tlb_all(); 750b8d8b883SAshok Raj cpu_clear(cpu, cpu_callin_map); 7511da177e4SLinus Torvalds return 0; 7521da177e4SLinus Torvalds } 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds void __cpu_die(unsigned int cpu) 7551da177e4SLinus Torvalds { 7561da177e4SLinus Torvalds unsigned int i; 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds for (i = 0; i < 100; i++) { 7591da177e4SLinus Torvalds /* They ack this in play_dead by setting CPU_DEAD */ 7601da177e4SLinus Torvalds if (per_cpu(cpu_state, cpu) == CPU_DEAD) 7611da177e4SLinus Torvalds { 762b8d8b883SAshok Raj printk ("CPU %d is now offline\n", cpu); 7631da177e4SLinus Torvalds return; 7641da177e4SLinus Torvalds } 7651da177e4SLinus Torvalds msleep(100); 7661da177e4SLinus Torvalds } 7671da177e4SLinus Torvalds printk(KERN_ERR "CPU %u didn't die...\n", cpu); 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds #endif /* CONFIG_HOTPLUG_CPU */ 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvalds void 7721da177e4SLinus Torvalds smp_cpus_done (unsigned int dummy) 7731da177e4SLinus Torvalds { 7741da177e4SLinus Torvalds int cpu; 7751da177e4SLinus Torvalds unsigned long bogosum = 0; 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* 7781da177e4SLinus Torvalds * Allow the user to impress friends. 7791da177e4SLinus Torvalds */ 7801da177e4SLinus Torvalds 781dc565b52Shawkes@sgi.com for_each_online_cpu(cpu) { 7821da177e4SLinus Torvalds bogosum += cpu_data(cpu)->loops_per_jiffy; 783dc565b52Shawkes@sgi.com } 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", 7861da177e4SLinus Torvalds (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 789e927ecb0SSuresh Siddha static inline void __devinit 790e927ecb0SSuresh Siddha set_cpu_sibling_map(int cpu) 791e927ecb0SSuresh Siddha { 792e927ecb0SSuresh Siddha int i; 793e927ecb0SSuresh Siddha 794e927ecb0SSuresh Siddha for_each_online_cpu(i) { 795e927ecb0SSuresh Siddha if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { 796e927ecb0SSuresh Siddha cpu_set(i, cpu_core_map[cpu]); 797e927ecb0SSuresh Siddha cpu_set(cpu, cpu_core_map[i]); 798e927ecb0SSuresh Siddha if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { 799d5a7430dSMike Travis cpu_set(i, per_cpu(cpu_sibling_map, cpu)); 800d5a7430dSMike Travis cpu_set(cpu, per_cpu(cpu_sibling_map, i)); 801e927ecb0SSuresh Siddha } 802e927ecb0SSuresh Siddha } 803e927ecb0SSuresh Siddha } 804e927ecb0SSuresh Siddha } 805e927ecb0SSuresh Siddha 8069d6f40b8STony Luck int __cpuinit 8071da177e4SLinus Torvalds __cpu_up (unsigned int cpu) 8081da177e4SLinus Torvalds { 8091da177e4SLinus Torvalds int ret; 8101da177e4SLinus Torvalds int sapicid; 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds sapicid = ia64_cpu_to_sapicid[cpu]; 8131da177e4SLinus Torvalds if (sapicid == -1) 8141da177e4SLinus Torvalds return -EINVAL; 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds /* 817b8d8b883SAshok Raj * Already booted cpu? not valid anymore since we dont 818b8d8b883SAshok Raj * do idle loop tightspin anymore. 8191da177e4SLinus Torvalds */ 8201da177e4SLinus Torvalds if (cpu_isset(cpu, cpu_callin_map)) 821b8d8b883SAshok Raj return -EINVAL; 822b8d8b883SAshok Raj 823a9fa06c2SShaohua Li per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; 8241da177e4SLinus Torvalds /* Processor goes to start_secondary(), sets online flag */ 8251da177e4SLinus Torvalds ret = do_boot_cpu(sapicid, cpu); 8261da177e4SLinus Torvalds if (ret < 0) 8271da177e4SLinus Torvalds return ret; 8281da177e4SLinus Torvalds 829e927ecb0SSuresh Siddha if (cpu_data(cpu)->threads_per_core == 1 && 830e927ecb0SSuresh Siddha cpu_data(cpu)->cores_per_socket == 1) { 831d5a7430dSMike Travis cpu_set(cpu, per_cpu(cpu_sibling_map, cpu)); 832e927ecb0SSuresh Siddha cpu_set(cpu, cpu_core_map[cpu]); 833e927ecb0SSuresh Siddha return 0; 834e927ecb0SSuresh Siddha } 835e927ecb0SSuresh Siddha 836e927ecb0SSuresh Siddha set_cpu_sibling_map(cpu); 837e927ecb0SSuresh Siddha 8381da177e4SLinus Torvalds return 0; 8391da177e4SLinus Torvalds } 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds /* 84272fdbdceSSimon Arlott * Assume that CPUs have been discovered by some platform-dependent interface. For 8431da177e4SLinus Torvalds * SoftSDV/Lion, that would be ACPI. 8441da177e4SLinus Torvalds * 8451da177e4SLinus Torvalds * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). 8461da177e4SLinus Torvalds */ 8471da177e4SLinus Torvalds void __init 8481da177e4SLinus Torvalds init_smp_config(void) 8491da177e4SLinus Torvalds { 8501da177e4SLinus Torvalds struct fptr { 8511da177e4SLinus Torvalds unsigned long fp; 8521da177e4SLinus Torvalds unsigned long gp; 8531da177e4SLinus Torvalds } *ap_startup; 8541da177e4SLinus Torvalds long sal_ret; 8551da177e4SLinus Torvalds 85672fdbdceSSimon Arlott /* Tell SAL where to drop the APs. */ 8571da177e4SLinus Torvalds ap_startup = (struct fptr *) start_ap; 8581da177e4SLinus Torvalds sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, 8591da177e4SLinus Torvalds ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); 8601da177e4SLinus Torvalds if (sal_ret < 0) 8611da177e4SLinus Torvalds printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", 8621da177e4SLinus Torvalds ia64_sal_strerror(sal_ret)); 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds 865e927ecb0SSuresh Siddha /* 866e927ecb0SSuresh Siddha * identify_siblings(cpu) gets called from identify_cpu. This populates the 867e927ecb0SSuresh Siddha * information related to logical execution units in per_cpu_data structure. 868e927ecb0SSuresh Siddha */ 869e927ecb0SSuresh Siddha void __devinit 870e927ecb0SSuresh Siddha identify_siblings(struct cpuinfo_ia64 *c) 871e927ecb0SSuresh Siddha { 872e927ecb0SSuresh Siddha s64 status; 873e927ecb0SSuresh Siddha u16 pltid; 874e927ecb0SSuresh Siddha pal_logical_to_physical_t info; 875e927ecb0SSuresh Siddha 8766ff0bc94SAlex Chiang status = ia64_pal_logical_to_phys(-1, &info); 8776ff0bc94SAlex Chiang if (status != PAL_STATUS_SUCCESS) { 878113134fcSAlex Chiang if (status != PAL_STATUS_UNIMPLEMENTED) { 879113134fcSAlex Chiang printk(KERN_ERR 880113134fcSAlex Chiang "ia64_pal_logical_to_phys failed with %ld\n", 881e927ecb0SSuresh Siddha status); 882e927ecb0SSuresh Siddha return; 883e927ecb0SSuresh Siddha } 884113134fcSAlex Chiang 885113134fcSAlex Chiang info.overview_ppid = 0; 886113134fcSAlex Chiang info.overview_cpp = 1; 887113134fcSAlex Chiang info.overview_tpc = 1; 888113134fcSAlex Chiang } 8896ff0bc94SAlex Chiang 8906ff0bc94SAlex Chiang status = ia64_sal_physical_id_info(&pltid); 8916ff0bc94SAlex Chiang if (status != PAL_STATUS_SUCCESS) { 8926ff0bc94SAlex Chiang if (status != PAL_STATUS_UNIMPLEMENTED) 8936ff0bc94SAlex Chiang printk(KERN_ERR 8946ff0bc94SAlex Chiang "ia64_sal_pltid failed with %ld\n", 8956ff0bc94SAlex Chiang status); 896e927ecb0SSuresh Siddha return; 897e927ecb0SSuresh Siddha } 898e927ecb0SSuresh Siddha 899e927ecb0SSuresh Siddha c->socket_id = (pltid << 8) | info.overview_ppid; 900113134fcSAlex Chiang 901113134fcSAlex Chiang if (info.overview_cpp == 1 && info.overview_tpc == 1) 902113134fcSAlex Chiang return; 903113134fcSAlex Chiang 904e927ecb0SSuresh Siddha c->cores_per_socket = info.overview_cpp; 905e927ecb0SSuresh Siddha c->threads_per_core = info.overview_tpc; 9064129a953SFenghua Yu c->num_log = info.overview_num_log; 907e927ecb0SSuresh Siddha 908e927ecb0SSuresh Siddha c->core_id = info.log1_cid; 909e927ecb0SSuresh Siddha c->thread_id = info.log1_tid; 910e927ecb0SSuresh Siddha } 911dd562c05SStephane Eranian 912dd562c05SStephane Eranian /* 913dd562c05SStephane Eranian * returns non zero, if multi-threading is enabled 914dd562c05SStephane Eranian * on at least one physical package. Due to hotplug cpu 915dd562c05SStephane Eranian * and (maxcpus=), all threads may not necessarily be enabled 916dd562c05SStephane Eranian * even though the processor supports multi-threading. 917dd562c05SStephane Eranian */ 918dd562c05SStephane Eranian int is_multithreading_enabled(void) 919dd562c05SStephane Eranian { 920dd562c05SStephane Eranian int i, j; 921dd562c05SStephane Eranian 922dd562c05SStephane Eranian for_each_present_cpu(i) { 923dd562c05SStephane Eranian for_each_present_cpu(j) { 924dd562c05SStephane Eranian if (j == i) 925dd562c05SStephane Eranian continue; 926dd562c05SStephane Eranian if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { 927dd562c05SStephane Eranian if (cpu_data(j)->core_id == cpu_data(i)->core_id) 928dd562c05SStephane Eranian return 1; 929dd562c05SStephane Eranian } 930dd562c05SStephane Eranian } 931dd562c05SStephane Eranian } 932dd562c05SStephane Eranian return 0; 933dd562c05SStephane Eranian } 934dd562c05SStephane Eranian EXPORT_SYMBOL_GPL(is_multithreading_enabled); 935