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> 53e51835d5SIsaku Yamahata #include <asm/paravirt.h> 541da177e4SLinus Torvalds #include <asm/pgalloc.h> 551da177e4SLinus Torvalds #include <asm/pgtable.h> 561da177e4SLinus Torvalds #include <asm/processor.h> 571da177e4SLinus Torvalds #include <asm/ptrace.h> 581da177e4SLinus Torvalds #include <asm/sal.h> 591da177e4SLinus Torvalds #include <asm/system.h> 601da177e4SLinus Torvalds #include <asm/tlbflush.h> 611da177e4SLinus Torvalds #include <asm/unistd.h> 626e9de181SJohn Keller #include <asm/sn/arch.h> 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds #define SMP_DEBUG 0 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds #if SMP_DEBUG 671da177e4SLinus Torvalds #define Dprintk(x...) printk(x) 681da177e4SLinus Torvalds #else 691da177e4SLinus Torvalds #define Dprintk(x...) 701da177e4SLinus Torvalds #endif 711da177e4SLinus Torvalds 72b8d8b883SAshok Raj #ifdef CONFIG_HOTPLUG_CPU 73ff741906SAshok Raj #ifdef CONFIG_PERMIT_BSP_REMOVE 74ff741906SAshok Raj #define bsp_remove_ok 1 75ff741906SAshok Raj #else 76ff741906SAshok Raj #define bsp_remove_ok 0 77ff741906SAshok Raj #endif 78ff741906SAshok Raj 79b8d8b883SAshok Raj /* 80b8d8b883SAshok Raj * Store all idle threads, this can be reused instead of creating 81b8d8b883SAshok Raj * a new thread. Also avoids complicated thread destroy functionality 82b8d8b883SAshok Raj * for idle threads. 83b8d8b883SAshok Raj */ 84b8d8b883SAshok Raj struct task_struct *idle_thread_array[NR_CPUS]; 85b8d8b883SAshok Raj 86b8d8b883SAshok Raj /* 87b8d8b883SAshok Raj * Global array allocated for NR_CPUS at boot time 88b8d8b883SAshok Raj */ 89b8d8b883SAshok Raj struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS]; 90b8d8b883SAshok Raj 91b8d8b883SAshok Raj /* 92b8d8b883SAshok Raj * start_ap in head.S uses this to store current booting cpu 93b8d8b883SAshok Raj * info. 94b8d8b883SAshok Raj */ 95b8d8b883SAshok Raj struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0]; 96b8d8b883SAshok Raj 97b8d8b883SAshok Raj #define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]); 98b8d8b883SAshok Raj 99b8d8b883SAshok Raj #define get_idle_for_cpu(x) (idle_thread_array[(x)]) 100b8d8b883SAshok Raj #define set_idle_for_cpu(x,p) (idle_thread_array[(x)] = (p)) 101b8d8b883SAshok Raj 102b8d8b883SAshok Raj #else 103b8d8b883SAshok Raj 104b8d8b883SAshok Raj #define get_idle_for_cpu(x) (NULL) 105b8d8b883SAshok Raj #define set_idle_for_cpu(x,p) 106b8d8b883SAshok Raj #define set_brendez_area(x) 107b8d8b883SAshok Raj #endif 108b8d8b883SAshok Raj 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds /* 1111da177e4SLinus Torvalds * ITC synchronization related stuff: 1121da177e4SLinus Torvalds */ 113ff741906SAshok Raj #define MASTER (0) 1141da177e4SLinus Torvalds #define SLAVE (SMP_CACHE_BYTES/8) 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds #define NUM_ROUNDS 64 /* magic value */ 1171da177e4SLinus Torvalds #define NUM_ITERS 5 /* likewise */ 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds static DEFINE_SPINLOCK(itc_sync_lock); 1201da177e4SLinus Torvalds static volatile unsigned long go[SLAVE + 1]; 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds #define DEBUG_ITC_SYNC 0 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds extern void start_ap (void); 1251da177e4SLinus Torvalds extern unsigned long ia64_iobase; 1261da177e4SLinus Torvalds 12736c8b586SIngo Molnar struct task_struct *task_for_booting_cpu; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds /* 1301da177e4SLinus Torvalds * State for each CPU 1311da177e4SLinus Torvalds */ 1321da177e4SLinus Torvalds DEFINE_PER_CPU(int, cpu_state); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* Bitmasks of currently online, and possible CPUs */ 1351da177e4SLinus Torvalds cpumask_t cpu_online_map; 1361da177e4SLinus Torvalds EXPORT_SYMBOL(cpu_online_map); 13769aa234bSAshok Raj cpumask_t cpu_possible_map = CPU_MASK_NONE; 1381da177e4SLinus Torvalds EXPORT_SYMBOL(cpu_possible_map); 1391da177e4SLinus Torvalds 140e927ecb0SSuresh Siddha cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; 141d5a7430dSMike Travis DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); 142d5a7430dSMike Travis EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); 143d5a7430dSMike Travis 144e927ecb0SSuresh Siddha int smp_num_siblings = 1; 145e927ecb0SSuresh Siddha 1461da177e4SLinus Torvalds /* which logical CPU number maps to which CPU (physical APIC ID) */ 1471da177e4SLinus Torvalds volatile int ia64_cpu_to_sapicid[NR_CPUS]; 1481da177e4SLinus Torvalds EXPORT_SYMBOL(ia64_cpu_to_sapicid); 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds static volatile cpumask_t cpu_callin_map; 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds struct smp_boot_data smp_boot_data __initdata; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds char __initdata no_int_routing; 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ 1591da177e4SLinus Torvalds 160ff741906SAshok Raj #ifdef CONFIG_FORCE_CPEI_RETARGET 161ff741906SAshok Raj #define CPEI_OVERRIDE_DEFAULT (1) 162ff741906SAshok Raj #else 163ff741906SAshok Raj #define CPEI_OVERRIDE_DEFAULT (0) 164ff741906SAshok Raj #endif 165ff741906SAshok Raj 166ff741906SAshok Raj unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; 167ff741906SAshok Raj 168ff741906SAshok Raj static int __init 169ff741906SAshok Raj cmdl_force_cpei(char *str) 170ff741906SAshok Raj { 171ff741906SAshok Raj int value=0; 172ff741906SAshok Raj 173ff741906SAshok Raj get_option (&str, &value); 174ff741906SAshok Raj force_cpei_retarget = value; 175ff741906SAshok Raj 176ff741906SAshok Raj return 1; 177ff741906SAshok Raj } 178ff741906SAshok Raj 179ff741906SAshok Raj __setup("force_cpei=", cmdl_force_cpei); 180ff741906SAshok Raj 1811da177e4SLinus Torvalds static int __init 1821da177e4SLinus Torvalds nointroute (char *str) 1831da177e4SLinus Torvalds { 1841da177e4SLinus Torvalds no_int_routing = 1; 1851da177e4SLinus Torvalds printk ("no_int_routing on\n"); 1861da177e4SLinus Torvalds return 1; 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds __setup("nointroute", nointroute); 1901da177e4SLinus Torvalds 191ff741906SAshok Raj static void fix_b0_for_bsp(void) 192ff741906SAshok Raj { 193ff741906SAshok Raj #ifdef CONFIG_HOTPLUG_CPU 194ff741906SAshok Raj int cpuid; 195ff741906SAshok Raj static int fix_bsp_b0 = 1; 196ff741906SAshok Raj 197ff741906SAshok Raj cpuid = smp_processor_id(); 198ff741906SAshok Raj 199ff741906SAshok Raj /* 200ff741906SAshok Raj * Cache the b0 value on the first AP that comes up 201ff741906SAshok Raj */ 202ff741906SAshok Raj if (!(fix_bsp_b0 && cpuid)) 203ff741906SAshok Raj return; 204ff741906SAshok Raj 205ff741906SAshok Raj sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0]; 206ff741906SAshok Raj printk ("Fixed BSP b0 value from CPU %d\n", cpuid); 207ff741906SAshok Raj 208ff741906SAshok Raj fix_bsp_b0 = 0; 209ff741906SAshok Raj #endif 210ff741906SAshok Raj } 211ff741906SAshok Raj 2121da177e4SLinus Torvalds void 2131da177e4SLinus Torvalds sync_master (void *arg) 2141da177e4SLinus Torvalds { 2151da177e4SLinus Torvalds unsigned long flags, i; 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds go[MASTER] = 0; 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvalds local_irq_save(flags); 2201da177e4SLinus Torvalds { 2211da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) { 22282975115SDavid Mosberger-Tang while (!go[MASTER]) 22382975115SDavid Mosberger-Tang cpu_relax(); 2241da177e4SLinus Torvalds go[MASTER] = 0; 2251da177e4SLinus Torvalds go[SLAVE] = ia64_get_itc(); 2261da177e4SLinus Torvalds } 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds local_irq_restore(flags); 2291da177e4SLinus Torvalds } 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds /* 2321da177e4SLinus Torvalds * Return the number of cycles by which our itc differs from the itc on the master 2331da177e4SLinus Torvalds * (time-keeper) CPU. A positive number indicates our itc is ahead of the master, 2341da177e4SLinus Torvalds * negative that it is behind. 2351da177e4SLinus Torvalds */ 2361da177e4SLinus Torvalds static inline long 2371da177e4SLinus Torvalds get_delta (long *rt, long *master) 2381da177e4SLinus Torvalds { 2391da177e4SLinus Torvalds unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; 2401da177e4SLinus Torvalds unsigned long tcenter, t0, t1, tm; 2411da177e4SLinus Torvalds long i; 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds for (i = 0; i < NUM_ITERS; ++i) { 2441da177e4SLinus Torvalds t0 = ia64_get_itc(); 2451da177e4SLinus Torvalds go[MASTER] = 1; 24682975115SDavid Mosberger-Tang while (!(tm = go[SLAVE])) 24782975115SDavid Mosberger-Tang cpu_relax(); 2481da177e4SLinus Torvalds go[SLAVE] = 0; 2491da177e4SLinus Torvalds t1 = ia64_get_itc(); 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds if (t1 - t0 < best_t1 - best_t0) 2521da177e4SLinus Torvalds best_t0 = t0, best_t1 = t1, best_tm = tm; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds *rt = best_t1 - best_t0; 2561da177e4SLinus Torvalds *master = best_tm - best_t0; 2571da177e4SLinus Torvalds 2581da177e4SLinus Torvalds /* average best_t0 and best_t1 without overflow: */ 2591da177e4SLinus Torvalds tcenter = (best_t0/2 + best_t1/2); 2601da177e4SLinus Torvalds if (best_t0 % 2 + best_t1 % 2 == 2) 2611da177e4SLinus Torvalds ++tcenter; 2621da177e4SLinus Torvalds return tcenter - best_tm; 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds 2651da177e4SLinus Torvalds /* 2661da177e4SLinus Torvalds * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU 2671da177e4SLinus Torvalds * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of 2681da177e4SLinus Torvalds * unaccounted-for errors (such as getting a machine check in the middle of a calibration 2691da177e4SLinus Torvalds * step). The basic idea is for the slave to ask the master what itc value it has and to 2701da177e4SLinus Torvalds * read its own itc before and after the master responds. Each iteration gives us three 2711da177e4SLinus Torvalds * timestamps: 2721da177e4SLinus Torvalds * 2731da177e4SLinus Torvalds * slave master 2741da177e4SLinus Torvalds * 2751da177e4SLinus Torvalds * t0 ---\ 2761da177e4SLinus Torvalds * ---\ 2771da177e4SLinus Torvalds * ---> 2781da177e4SLinus Torvalds * tm 2791da177e4SLinus Torvalds * /--- 2801da177e4SLinus Torvalds * /--- 2811da177e4SLinus Torvalds * t1 <--- 2821da177e4SLinus Torvalds * 2831da177e4SLinus Torvalds * 2841da177e4SLinus Torvalds * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0 2851da177e4SLinus Torvalds * and t1. If we achieve this, the clocks are synchronized provided the interconnect 2861da177e4SLinus Torvalds * between the slave and the master is symmetric. Even if the interconnect were 2871da177e4SLinus Torvalds * asymmetric, we would still know that the synchronization error is smaller than the 2881da177e4SLinus Torvalds * roundtrip latency (t0 - t1). 2891da177e4SLinus Torvalds * 2901da177e4SLinus Torvalds * When the interconnect is quiet and symmetric, this lets us synchronize the itc to 2911da177e4SLinus Torvalds * within one or two cycles. However, we can only *guarantee* that the synchronization is 2921da177e4SLinus Torvalds * accurate to within a round-trip time, which is typically in the range of several 2931da177e4SLinus Torvalds * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually 2941da177e4SLinus Torvalds * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better 2951da177e4SLinus Torvalds * than half a micro second or so. 2961da177e4SLinus Torvalds */ 2971da177e4SLinus Torvalds void 2981da177e4SLinus Torvalds ia64_sync_itc (unsigned int master) 2991da177e4SLinus Torvalds { 3001da177e4SLinus Torvalds long i, delta, adj, adjust_latency = 0, done = 0; 3011da177e4SLinus Torvalds unsigned long flags, rt, master_time_stamp, bound; 3021da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3031da177e4SLinus Torvalds struct { 3041da177e4SLinus Torvalds long rt; /* roundtrip time */ 3051da177e4SLinus Torvalds long master; /* master's timestamp */ 3061da177e4SLinus Torvalds long diff; /* difference between midpoint and master's timestamp */ 3071da177e4SLinus Torvalds long lat; /* estimate of itc adjustment latency */ 3081da177e4SLinus Torvalds } t[NUM_ROUNDS]; 3091da177e4SLinus Torvalds #endif 3101da177e4SLinus Torvalds 3111da177e4SLinus Torvalds /* 3121da177e4SLinus Torvalds * Make sure local timer ticks are disabled while we sync. If 3131da177e4SLinus Torvalds * they were enabled, we'd have to worry about nasty issues 3141da177e4SLinus Torvalds * like setting the ITC ahead of (or a long time before) the 3151da177e4SLinus Torvalds * next scheduled tick. 3161da177e4SLinus Torvalds */ 3171da177e4SLinus Torvalds BUG_ON((ia64_get_itv() & (1 << 16)) == 0); 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds go[MASTER] = 1; 3201da177e4SLinus Torvalds 3218691e5a8SJens Axboe if (smp_call_function_single(master, sync_master, NULL, 0) < 0) { 3221da177e4SLinus Torvalds printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); 3231da177e4SLinus Torvalds return; 3241da177e4SLinus Torvalds } 3251da177e4SLinus Torvalds 32682975115SDavid Mosberger-Tang while (go[MASTER]) 32782975115SDavid Mosberger-Tang cpu_relax(); /* wait for master to be ready */ 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds spin_lock_irqsave(&itc_sync_lock, flags); 3301da177e4SLinus Torvalds { 3311da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS; ++i) { 3321da177e4SLinus Torvalds delta = get_delta(&rt, &master_time_stamp); 3331da177e4SLinus Torvalds if (delta == 0) { 3341da177e4SLinus Torvalds done = 1; /* let's lock on to this... */ 3351da177e4SLinus Torvalds bound = rt; 3361da177e4SLinus Torvalds } 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds if (!done) { 3391da177e4SLinus Torvalds if (i > 0) { 3401da177e4SLinus Torvalds adjust_latency += -delta; 3411da177e4SLinus Torvalds adj = -delta + adjust_latency/4; 3421da177e4SLinus Torvalds } else 3431da177e4SLinus Torvalds adj = -delta; 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds ia64_set_itc(ia64_get_itc() + adj); 3461da177e4SLinus Torvalds } 3471da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3481da177e4SLinus Torvalds t[i].rt = rt; 3491da177e4SLinus Torvalds t[i].master = master_time_stamp; 3501da177e4SLinus Torvalds t[i].diff = delta; 3511da177e4SLinus Torvalds t[i].lat = adjust_latency/4; 3521da177e4SLinus Torvalds #endif 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds spin_unlock_irqrestore(&itc_sync_lock, flags); 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds #if DEBUG_ITC_SYNC 3581da177e4SLinus Torvalds for (i = 0; i < NUM_ROUNDS; ++i) 3591da177e4SLinus Torvalds printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", 3601da177e4SLinus Torvalds t[i].rt, t[i].master, t[i].diff, t[i].lat); 3611da177e4SLinus Torvalds #endif 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, " 3641da177e4SLinus Torvalds "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt); 3651da177e4SLinus Torvalds } 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds /* 3681da177e4SLinus Torvalds * Ideally sets up per-cpu profiling hooks. Doesn't do much now... 3691da177e4SLinus Torvalds */ 3701da177e4SLinus Torvalds static inline void __devinit 3711da177e4SLinus Torvalds smp_setup_percpu_timer (void) 3721da177e4SLinus Torvalds { 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 375d86ebd14STony Luck static void __cpuinit 3761da177e4SLinus Torvalds smp_callin (void) 3771da177e4SLinus Torvalds { 378ff741906SAshok Raj int cpuid, phys_id, itc_master; 379ead6caaeSJack Steiner struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; 3801da177e4SLinus Torvalds extern void ia64_init_itm(void); 381ff741906SAshok Raj extern volatile int time_keeper_id; 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds #ifdef CONFIG_PERFMON 3841da177e4SLinus Torvalds extern void pfm_init_percpu(void); 3851da177e4SLinus Torvalds #endif 3861da177e4SLinus Torvalds 3871da177e4SLinus Torvalds cpuid = smp_processor_id(); 3881da177e4SLinus Torvalds phys_id = hard_smp_processor_id(); 389ff741906SAshok Raj itc_master = time_keeper_id; 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds if (cpu_online(cpuid)) { 3921da177e4SLinus Torvalds printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n", 3931da177e4SLinus Torvalds phys_id, cpuid); 3941da177e4SLinus Torvalds BUG(); 3951da177e4SLinus Torvalds } 3961da177e4SLinus Torvalds 397ff741906SAshok Raj fix_b0_for_bsp(); 398ff741906SAshok Raj 399f27b433eSJens Axboe ipi_call_lock_irq(); 400e1b30a39SYasuaki Ishimatsu spin_lock(&vector_lock); 401e1b30a39SYasuaki Ishimatsu /* Setup the per cpu irq handling data structures */ 402e1b30a39SYasuaki Ishimatsu __setup_vector_irq(cpuid); 4031da177e4SLinus Torvalds cpu_set(cpuid, cpu_online_map); 404a9fa06c2SShaohua Li per_cpu(cpu_state, cpuid) = CPU_ONLINE; 405e1b30a39SYasuaki Ishimatsu spin_unlock(&vector_lock); 406f27b433eSJens Axboe ipi_call_unlock_irq(); 4071da177e4SLinus Torvalds 4081da177e4SLinus Torvalds smp_setup_percpu_timer(); 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ 4111da177e4SLinus Torvalds 4121da177e4SLinus Torvalds #ifdef CONFIG_PERFMON 4131da177e4SLinus Torvalds pfm_init_percpu(); 4141da177e4SLinus Torvalds #endif 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds local_irq_enable(); 4171da177e4SLinus Torvalds 4181da177e4SLinus Torvalds if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) { 4191da177e4SLinus Torvalds /* 4201da177e4SLinus Torvalds * Synchronize the ITC with the BP. Need to do this after irqs are 4211da177e4SLinus Torvalds * enabled because ia64_sync_itc() calls smp_call_function_single(), which 4221da177e4SLinus Torvalds * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls 4231da177e4SLinus Torvalds * local_bh_enable(), which bugs out if irqs are not enabled... 4241da177e4SLinus Torvalds */ 425ff741906SAshok Raj Dprintk("Going to syncup ITC with ITC Master.\n"); 426ff741906SAshok Raj ia64_sync_itc(itc_master); 4271da177e4SLinus Torvalds } 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* 4301da177e4SLinus Torvalds * Get our bogomips. 4311da177e4SLinus Torvalds */ 4321da177e4SLinus Torvalds ia64_init_itm(); 433ead6caaeSJack Steiner 434ead6caaeSJack Steiner /* 435ead6caaeSJack Steiner * Delay calibration can be skipped if new processor is identical to the 436ead6caaeSJack Steiner * previous processor. 437ead6caaeSJack Steiner */ 438ead6caaeSJack Steiner last_cpuinfo = cpu_data(cpuid - 1); 439ead6caaeSJack Steiner this_cpuinfo = local_cpu_data; 440ead6caaeSJack Steiner if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq || 441ead6caaeSJack Steiner last_cpuinfo->proc_freq != this_cpuinfo->proc_freq || 442ead6caaeSJack Steiner last_cpuinfo->features != this_cpuinfo->features || 443ead6caaeSJack Steiner last_cpuinfo->revision != this_cpuinfo->revision || 444ead6caaeSJack Steiner last_cpuinfo->family != this_cpuinfo->family || 445ead6caaeSJack Steiner last_cpuinfo->archrev != this_cpuinfo->archrev || 446ead6caaeSJack Steiner last_cpuinfo->model != this_cpuinfo->model) 4471da177e4SLinus Torvalds calibrate_delay(); 4481da177e4SLinus Torvalds local_cpu_data->loops_per_jiffy = loops_per_jiffy; 4491da177e4SLinus Torvalds 4501da177e4SLinus Torvalds #ifdef CONFIG_IA32_SUPPORT 4511da177e4SLinus Torvalds ia32_gdt_init(); 4521da177e4SLinus Torvalds #endif 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds /* 4551da177e4SLinus Torvalds * Allow the master to continue. 4561da177e4SLinus Torvalds */ 4571da177e4SLinus Torvalds cpu_set(cpuid, cpu_callin_map); 4581da177e4SLinus Torvalds Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid); 4591da177e4SLinus Torvalds } 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds /* 4631da177e4SLinus Torvalds * Activate a secondary processor. head.S calls this. 4641da177e4SLinus Torvalds */ 465d86ebd14STony Luck int __cpuinit 4661da177e4SLinus Torvalds start_secondary (void *unused) 4671da177e4SLinus Torvalds { 4681da177e4SLinus Torvalds /* Early console may use I/O ports */ 4691da177e4SLinus Torvalds ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); 47010617bbeSTony Luck #ifndef CONFIG_PRINTK_TIME 4711da177e4SLinus Torvalds Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); 47210617bbeSTony Luck #endif 4731da177e4SLinus Torvalds efi_map_pal_code(); 4741da177e4SLinus Torvalds cpu_init(); 4755bfb5d69SNick Piggin preempt_disable(); 4761da177e4SLinus Torvalds smp_callin(); 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds cpu_idle(); 4791da177e4SLinus Torvalds return 0; 4801da177e4SLinus Torvalds } 4811da177e4SLinus Torvalds 4826b2fb3c6SAdrian Bunk struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs) 4831da177e4SLinus Torvalds { 4841da177e4SLinus Torvalds return NULL; 4851da177e4SLinus Torvalds } 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds struct create_idle { 4886d5aefb8SDavid Howells struct work_struct work; 4891da177e4SLinus Torvalds struct task_struct *idle; 4901da177e4SLinus Torvalds struct completion done; 4911da177e4SLinus Torvalds int cpu; 4921da177e4SLinus Torvalds }; 4931da177e4SLinus Torvalds 4949d6f40b8STony Luck void __cpuinit 4956d5aefb8SDavid Howells do_fork_idle(struct work_struct *work) 4961da177e4SLinus Torvalds { 4976d5aefb8SDavid Howells struct create_idle *c_idle = 4986d5aefb8SDavid Howells container_of(work, struct create_idle, work); 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds c_idle->idle = fork_idle(c_idle->cpu); 5011da177e4SLinus Torvalds complete(&c_idle->done); 5021da177e4SLinus Torvalds } 5031da177e4SLinus Torvalds 5049d6f40b8STony Luck static int __cpuinit 5051da177e4SLinus Torvalds do_boot_cpu (int sapicid, int cpu) 5061da177e4SLinus Torvalds { 5071da177e4SLinus Torvalds int timeout; 5081da177e4SLinus Torvalds struct create_idle c_idle = { 5096d5aefb8SDavid Howells .work = __WORK_INITIALIZER(c_idle.work, do_fork_idle), 5101da177e4SLinus Torvalds .cpu = cpu, 5111da177e4SLinus Torvalds .done = COMPLETION_INITIALIZER(c_idle.done), 5121da177e4SLinus Torvalds }; 513b8d8b883SAshok Raj 514b8d8b883SAshok Raj c_idle.idle = get_idle_for_cpu(cpu); 515b8d8b883SAshok Raj if (c_idle.idle) { 516b8d8b883SAshok Raj init_idle(c_idle.idle, cpu); 517b8d8b883SAshok Raj goto do_rest; 518b8d8b883SAshok Raj } 519b8d8b883SAshok Raj 5201da177e4SLinus Torvalds /* 5211da177e4SLinus Torvalds * We can't use kernel_thread since we must avoid to reschedule the child. 5221da177e4SLinus Torvalds */ 5231da177e4SLinus Torvalds if (!keventd_up() || current_is_keventd()) 5246d5aefb8SDavid Howells c_idle.work.func(&c_idle.work); 5251da177e4SLinus Torvalds else { 5266d5aefb8SDavid Howells schedule_work(&c_idle.work); 5271da177e4SLinus Torvalds wait_for_completion(&c_idle.done); 5281da177e4SLinus Torvalds } 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds if (IS_ERR(c_idle.idle)) 5311da177e4SLinus Torvalds panic("failed fork for CPU %d", cpu); 532b8d8b883SAshok Raj 533b8d8b883SAshok Raj set_idle_for_cpu(cpu, c_idle.idle); 534b8d8b883SAshok Raj 535b8d8b883SAshok Raj do_rest: 5361da177e4SLinus Torvalds task_for_booting_cpu = c_idle.idle; 5371da177e4SLinus Torvalds 5381da177e4SLinus Torvalds Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); 5391da177e4SLinus Torvalds 540b8d8b883SAshok Raj set_brendez_area(cpu); 5411da177e4SLinus Torvalds platform_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); 5421da177e4SLinus Torvalds 5431da177e4SLinus Torvalds /* 5441da177e4SLinus Torvalds * Wait 10s total for the AP to start 5451da177e4SLinus Torvalds */ 5461da177e4SLinus Torvalds Dprintk("Waiting on callin_map ..."); 5471da177e4SLinus Torvalds for (timeout = 0; timeout < 100000; timeout++) { 5481da177e4SLinus Torvalds if (cpu_isset(cpu, cpu_callin_map)) 5491da177e4SLinus Torvalds break; /* It has booted */ 5501da177e4SLinus Torvalds udelay(100); 5511da177e4SLinus Torvalds } 5521da177e4SLinus Torvalds Dprintk("\n"); 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds if (!cpu_isset(cpu, cpu_callin_map)) { 5551da177e4SLinus Torvalds printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); 5561da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = -1; 5571da177e4SLinus Torvalds cpu_clear(cpu, cpu_online_map); /* was set in smp_callin() */ 5581da177e4SLinus Torvalds return -EINVAL; 5591da177e4SLinus Torvalds } 5601da177e4SLinus Torvalds return 0; 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvalds static int __init 5641da177e4SLinus Torvalds decay (char *str) 5651da177e4SLinus Torvalds { 5661da177e4SLinus Torvalds int ticks; 5671da177e4SLinus Torvalds get_option (&str, &ticks); 5681da177e4SLinus Torvalds return 1; 5691da177e4SLinus Torvalds } 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds __setup("decay=", decay); 5721da177e4SLinus Torvalds 5731da177e4SLinus Torvalds /* 5741da177e4SLinus Torvalds * Initialize the logical CPU number to SAPICID mapping 5751da177e4SLinus Torvalds */ 5761da177e4SLinus Torvalds void __init 5771da177e4SLinus Torvalds smp_build_cpu_map (void) 5781da177e4SLinus Torvalds { 5791da177e4SLinus Torvalds int sapicid, cpu, i; 5801da177e4SLinus Torvalds int boot_cpu_id = hard_smp_processor_id(); 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds for (cpu = 0; cpu < NR_CPUS; cpu++) { 5831da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = -1; 5841da177e4SLinus Torvalds } 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds ia64_cpu_to_sapicid[0] = boot_cpu_id; 5871da177e4SLinus Torvalds cpus_clear(cpu_present_map); 5881da177e4SLinus Torvalds cpu_set(0, cpu_present_map); 5891da177e4SLinus Torvalds cpu_set(0, cpu_possible_map); 5901da177e4SLinus Torvalds for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { 5911da177e4SLinus Torvalds sapicid = smp_boot_data.cpu_phys_id[i]; 5921da177e4SLinus Torvalds if (sapicid == boot_cpu_id) 5931da177e4SLinus Torvalds continue; 5941da177e4SLinus Torvalds cpu_set(cpu, cpu_present_map); 5951da177e4SLinus Torvalds cpu_set(cpu, cpu_possible_map); 5961da177e4SLinus Torvalds ia64_cpu_to_sapicid[cpu] = sapicid; 5971da177e4SLinus Torvalds cpu++; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds } 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds /* 6021da177e4SLinus Torvalds * Cycle through the APs sending Wakeup IPIs to boot each. 6031da177e4SLinus Torvalds */ 6041da177e4SLinus Torvalds void __init 6051da177e4SLinus Torvalds smp_prepare_cpus (unsigned int max_cpus) 6061da177e4SLinus Torvalds { 6071da177e4SLinus Torvalds int boot_cpu_id = hard_smp_processor_id(); 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds /* 6101da177e4SLinus Torvalds * Initialize the per-CPU profiling counter/multiplier 6111da177e4SLinus Torvalds */ 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds smp_setup_percpu_timer(); 6141da177e4SLinus Torvalds 6151da177e4SLinus Torvalds /* 6161da177e4SLinus Torvalds * We have the boot CPU online for sure. 6171da177e4SLinus Torvalds */ 6181da177e4SLinus Torvalds cpu_set(0, cpu_online_map); 6191da177e4SLinus Torvalds cpu_set(0, cpu_callin_map); 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds local_cpu_data->loops_per_jiffy = loops_per_jiffy; 6221da177e4SLinus Torvalds ia64_cpu_to_sapicid[0] = boot_cpu_id; 6231da177e4SLinus Torvalds 6241da177e4SLinus Torvalds printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds current_thread_info()->cpu = 0; 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvalds /* 6291da177e4SLinus Torvalds * If SMP should be disabled, then really disable it! 6301da177e4SLinus Torvalds */ 6311da177e4SLinus Torvalds if (!max_cpus) { 6321da177e4SLinus Torvalds printk(KERN_INFO "SMP mode deactivated.\n"); 6331da177e4SLinus Torvalds cpus_clear(cpu_online_map); 6341da177e4SLinus Torvalds cpus_clear(cpu_present_map); 6351da177e4SLinus Torvalds cpus_clear(cpu_possible_map); 6361da177e4SLinus Torvalds cpu_set(0, cpu_online_map); 6371da177e4SLinus Torvalds cpu_set(0, cpu_present_map); 6381da177e4SLinus Torvalds cpu_set(0, cpu_possible_map); 6391da177e4SLinus Torvalds return; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds } 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds void __devinit smp_prepare_boot_cpu(void) 6441da177e4SLinus Torvalds { 6451da177e4SLinus Torvalds cpu_set(smp_processor_id(), cpu_online_map); 6461da177e4SLinus Torvalds cpu_set(smp_processor_id(), cpu_callin_map); 647a9fa06c2SShaohua Li per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; 648e51835d5SIsaku Yamahata paravirt_post_smp_prepare_boot_cpu(); 6491da177e4SLinus Torvalds } 6501da177e4SLinus Torvalds 6511da177e4SLinus Torvalds #ifdef CONFIG_HOTPLUG_CPU 652e927ecb0SSuresh Siddha static inline void 653e927ecb0SSuresh Siddha clear_cpu_sibling_map(int cpu) 654e927ecb0SSuresh Siddha { 655e927ecb0SSuresh Siddha int i; 656e927ecb0SSuresh Siddha 657d5a7430dSMike Travis for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) 658d5a7430dSMike Travis cpu_clear(cpu, per_cpu(cpu_sibling_map, i)); 659e927ecb0SSuresh Siddha for_each_cpu_mask(i, cpu_core_map[cpu]) 660e927ecb0SSuresh Siddha cpu_clear(cpu, cpu_core_map[i]); 661e927ecb0SSuresh Siddha 662d5a7430dSMike Travis per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE; 663e927ecb0SSuresh Siddha } 664e927ecb0SSuresh Siddha 665e927ecb0SSuresh Siddha static void 666e927ecb0SSuresh Siddha remove_siblinginfo(int cpu) 667e927ecb0SSuresh Siddha { 668e927ecb0SSuresh Siddha int last = 0; 669e927ecb0SSuresh Siddha 670e927ecb0SSuresh Siddha if (cpu_data(cpu)->threads_per_core == 1 && 671e927ecb0SSuresh Siddha cpu_data(cpu)->cores_per_socket == 1) { 672e927ecb0SSuresh Siddha cpu_clear(cpu, cpu_core_map[cpu]); 673d5a7430dSMike Travis cpu_clear(cpu, per_cpu(cpu_sibling_map, cpu)); 674e927ecb0SSuresh Siddha return; 675e927ecb0SSuresh Siddha } 676e927ecb0SSuresh Siddha 677e927ecb0SSuresh Siddha last = (cpus_weight(cpu_core_map[cpu]) == 1 ? 1 : 0); 678e927ecb0SSuresh Siddha 679e927ecb0SSuresh Siddha /* remove it from all sibling map's */ 680e927ecb0SSuresh Siddha clear_cpu_sibling_map(cpu); 681e927ecb0SSuresh Siddha } 682e927ecb0SSuresh Siddha 6831da177e4SLinus Torvalds extern void fixup_irqs(void); 684ff741906SAshok Raj 685ff741906SAshok Raj int migrate_platform_irqs(unsigned int cpu) 686ff741906SAshok Raj { 687ff741906SAshok Raj int new_cpei_cpu; 688ff741906SAshok Raj irq_desc_t *desc = NULL; 689ff741906SAshok Raj cpumask_t mask; 690ff741906SAshok Raj int retval = 0; 691ff741906SAshok Raj 692ff741906SAshok Raj /* 693ff741906SAshok Raj * dont permit CPEI target to removed. 694ff741906SAshok Raj */ 695ff741906SAshok Raj if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { 696ff741906SAshok Raj printk ("CPU (%d) is CPEI Target\n", cpu); 697ff741906SAshok Raj if (can_cpei_retarget()) { 698ff741906SAshok Raj /* 699ff741906SAshok Raj * Now re-target the CPEI to a different processor 700ff741906SAshok Raj */ 701ff741906SAshok Raj new_cpei_cpu = any_online_cpu(cpu_online_map); 702ff741906SAshok Raj mask = cpumask_of_cpu(new_cpei_cpu); 703ff741906SAshok Raj set_cpei_target_cpu(new_cpei_cpu); 704a8553acdSIngo Molnar desc = irq_desc + ia64_cpe_irq; 705ff741906SAshok Raj /* 70672fdbdceSSimon Arlott * Switch for now, immediately, we need to do fake intr 707ff741906SAshok Raj * as other interrupts, but need to study CPEI behaviour with 708ff741906SAshok Raj * polling before making changes. 709ff741906SAshok Raj */ 710ff741906SAshok Raj if (desc) { 711d1bef4edSIngo Molnar desc->chip->disable(ia64_cpe_irq); 712d1bef4edSIngo Molnar desc->chip->set_affinity(ia64_cpe_irq, mask); 713d1bef4edSIngo Molnar desc->chip->enable(ia64_cpe_irq); 714ff741906SAshok Raj printk ("Re-targetting CPEI to cpu %d\n", new_cpei_cpu); 715ff741906SAshok Raj } 716ff741906SAshok Raj } 717ff741906SAshok Raj if (!desc) { 718ff741906SAshok Raj printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); 719ff741906SAshok Raj retval = -EBUSY; 720ff741906SAshok Raj } 721ff741906SAshok Raj } 722ff741906SAshok Raj return retval; 723ff741906SAshok Raj } 724ff741906SAshok Raj 7251da177e4SLinus Torvalds /* must be called with cpucontrol mutex held */ 7261da177e4SLinus Torvalds int __cpu_disable(void) 7271da177e4SLinus Torvalds { 7281da177e4SLinus Torvalds int cpu = smp_processor_id(); 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds /* 7311da177e4SLinus Torvalds * dont permit boot processor for now 7321da177e4SLinus Torvalds */ 733ff741906SAshok Raj if (cpu == 0 && !bsp_remove_ok) { 734ff741906SAshok Raj printk ("Your platform does not support removal of BSP\n"); 735ff741906SAshok Raj return (-EBUSY); 736ff741906SAshok Raj } 737ff741906SAshok Raj 7386e9de181SJohn Keller if (ia64_platform_is("sn2")) { 7396e9de181SJohn Keller if (!sn_cpu_disable_allowed(cpu)) 7406e9de181SJohn Keller return -EBUSY; 7416e9de181SJohn Keller } 7426e9de181SJohn Keller 743ff741906SAshok Raj cpu_clear(cpu, cpu_online_map); 744ff741906SAshok Raj 745ff741906SAshok Raj if (migrate_platform_irqs(cpu)) { 746ff741906SAshok Raj cpu_set(cpu, cpu_online_map); 747ff741906SAshok Raj return (-EBUSY); 748ff741906SAshok Raj } 7491da177e4SLinus Torvalds 750e927ecb0SSuresh Siddha remove_siblinginfo(cpu); 751f3705136SZwane Mwaikambo cpu_clear(cpu, cpu_online_map); 7521da177e4SLinus Torvalds fixup_irqs(); 7531da177e4SLinus Torvalds local_flush_tlb_all(); 754b8d8b883SAshok Raj cpu_clear(cpu, cpu_callin_map); 7551da177e4SLinus Torvalds return 0; 7561da177e4SLinus Torvalds } 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds void __cpu_die(unsigned int cpu) 7591da177e4SLinus Torvalds { 7601da177e4SLinus Torvalds unsigned int i; 7611da177e4SLinus Torvalds 7621da177e4SLinus Torvalds for (i = 0; i < 100; i++) { 7631da177e4SLinus Torvalds /* They ack this in play_dead by setting CPU_DEAD */ 7641da177e4SLinus Torvalds if (per_cpu(cpu_state, cpu) == CPU_DEAD) 7651da177e4SLinus Torvalds { 766b8d8b883SAshok Raj printk ("CPU %d is now offline\n", cpu); 7671da177e4SLinus Torvalds return; 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds msleep(100); 7701da177e4SLinus Torvalds } 7711da177e4SLinus Torvalds printk(KERN_ERR "CPU %u didn't die...\n", cpu); 7721da177e4SLinus Torvalds } 7731da177e4SLinus Torvalds #endif /* CONFIG_HOTPLUG_CPU */ 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds void 7761da177e4SLinus Torvalds smp_cpus_done (unsigned int dummy) 7771da177e4SLinus Torvalds { 7781da177e4SLinus Torvalds int cpu; 7791da177e4SLinus Torvalds unsigned long bogosum = 0; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds /* 7821da177e4SLinus Torvalds * Allow the user to impress friends. 7831da177e4SLinus Torvalds */ 7841da177e4SLinus Torvalds 785dc565b52Shawkes@sgi.com for_each_online_cpu(cpu) { 7861da177e4SLinus Torvalds bogosum += cpu_data(cpu)->loops_per_jiffy; 787dc565b52Shawkes@sgi.com } 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", 7901da177e4SLinus Torvalds (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 793e927ecb0SSuresh Siddha static inline void __devinit 794e927ecb0SSuresh Siddha set_cpu_sibling_map(int cpu) 795e927ecb0SSuresh Siddha { 796e927ecb0SSuresh Siddha int i; 797e927ecb0SSuresh Siddha 798e927ecb0SSuresh Siddha for_each_online_cpu(i) { 799e927ecb0SSuresh Siddha if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { 800e927ecb0SSuresh Siddha cpu_set(i, cpu_core_map[cpu]); 801e927ecb0SSuresh Siddha cpu_set(cpu, cpu_core_map[i]); 802e927ecb0SSuresh Siddha if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { 803d5a7430dSMike Travis cpu_set(i, per_cpu(cpu_sibling_map, cpu)); 804d5a7430dSMike Travis cpu_set(cpu, per_cpu(cpu_sibling_map, i)); 805e927ecb0SSuresh Siddha } 806e927ecb0SSuresh Siddha } 807e927ecb0SSuresh Siddha } 808e927ecb0SSuresh Siddha } 809e927ecb0SSuresh Siddha 8109d6f40b8STony Luck int __cpuinit 8111da177e4SLinus Torvalds __cpu_up (unsigned int cpu) 8121da177e4SLinus Torvalds { 8131da177e4SLinus Torvalds int ret; 8141da177e4SLinus Torvalds int sapicid; 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvalds sapicid = ia64_cpu_to_sapicid[cpu]; 8171da177e4SLinus Torvalds if (sapicid == -1) 8181da177e4SLinus Torvalds return -EINVAL; 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds /* 821b8d8b883SAshok Raj * Already booted cpu? not valid anymore since we dont 822b8d8b883SAshok Raj * do idle loop tightspin anymore. 8231da177e4SLinus Torvalds */ 8241da177e4SLinus Torvalds if (cpu_isset(cpu, cpu_callin_map)) 825b8d8b883SAshok Raj return -EINVAL; 826b8d8b883SAshok Raj 827a9fa06c2SShaohua Li per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; 8281da177e4SLinus Torvalds /* Processor goes to start_secondary(), sets online flag */ 8291da177e4SLinus Torvalds ret = do_boot_cpu(sapicid, cpu); 8301da177e4SLinus Torvalds if (ret < 0) 8311da177e4SLinus Torvalds return ret; 8321da177e4SLinus Torvalds 833e927ecb0SSuresh Siddha if (cpu_data(cpu)->threads_per_core == 1 && 834e927ecb0SSuresh Siddha cpu_data(cpu)->cores_per_socket == 1) { 835d5a7430dSMike Travis cpu_set(cpu, per_cpu(cpu_sibling_map, cpu)); 836e927ecb0SSuresh Siddha cpu_set(cpu, cpu_core_map[cpu]); 837e927ecb0SSuresh Siddha return 0; 838e927ecb0SSuresh Siddha } 839e927ecb0SSuresh Siddha 840e927ecb0SSuresh Siddha set_cpu_sibling_map(cpu); 841e927ecb0SSuresh Siddha 8421da177e4SLinus Torvalds return 0; 8431da177e4SLinus Torvalds } 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvalds /* 84672fdbdceSSimon Arlott * Assume that CPUs have been discovered by some platform-dependent interface. For 8471da177e4SLinus Torvalds * SoftSDV/Lion, that would be ACPI. 8481da177e4SLinus Torvalds * 8491da177e4SLinus Torvalds * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). 8501da177e4SLinus Torvalds */ 8511da177e4SLinus Torvalds void __init 8521da177e4SLinus Torvalds init_smp_config(void) 8531da177e4SLinus Torvalds { 8541da177e4SLinus Torvalds struct fptr { 8551da177e4SLinus Torvalds unsigned long fp; 8561da177e4SLinus Torvalds unsigned long gp; 8571da177e4SLinus Torvalds } *ap_startup; 8581da177e4SLinus Torvalds long sal_ret; 8591da177e4SLinus Torvalds 86072fdbdceSSimon Arlott /* Tell SAL where to drop the APs. */ 8611da177e4SLinus Torvalds ap_startup = (struct fptr *) start_ap; 8621da177e4SLinus Torvalds sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, 8631da177e4SLinus Torvalds ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); 8641da177e4SLinus Torvalds if (sal_ret < 0) 8651da177e4SLinus Torvalds printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", 8661da177e4SLinus Torvalds ia64_sal_strerror(sal_ret)); 8671da177e4SLinus Torvalds } 8681da177e4SLinus Torvalds 869e927ecb0SSuresh Siddha /* 870e927ecb0SSuresh Siddha * identify_siblings(cpu) gets called from identify_cpu. This populates the 871e927ecb0SSuresh Siddha * information related to logical execution units in per_cpu_data structure. 872e927ecb0SSuresh Siddha */ 873e927ecb0SSuresh Siddha void __devinit 874e927ecb0SSuresh Siddha identify_siblings(struct cpuinfo_ia64 *c) 875e927ecb0SSuresh Siddha { 876e927ecb0SSuresh Siddha s64 status; 877e927ecb0SSuresh Siddha u16 pltid; 878e927ecb0SSuresh Siddha pal_logical_to_physical_t info; 879e927ecb0SSuresh Siddha 8806ff0bc94SAlex Chiang status = ia64_pal_logical_to_phys(-1, &info); 8816ff0bc94SAlex Chiang if (status != PAL_STATUS_SUCCESS) { 882113134fcSAlex Chiang if (status != PAL_STATUS_UNIMPLEMENTED) { 883113134fcSAlex Chiang printk(KERN_ERR 884113134fcSAlex Chiang "ia64_pal_logical_to_phys failed with %ld\n", 885e927ecb0SSuresh Siddha status); 886e927ecb0SSuresh Siddha return; 887e927ecb0SSuresh Siddha } 888113134fcSAlex Chiang 889113134fcSAlex Chiang info.overview_ppid = 0; 890113134fcSAlex Chiang info.overview_cpp = 1; 891113134fcSAlex Chiang info.overview_tpc = 1; 892113134fcSAlex Chiang } 8936ff0bc94SAlex Chiang 8946ff0bc94SAlex Chiang status = ia64_sal_physical_id_info(&pltid); 8956ff0bc94SAlex Chiang if (status != PAL_STATUS_SUCCESS) { 8966ff0bc94SAlex Chiang if (status != PAL_STATUS_UNIMPLEMENTED) 8976ff0bc94SAlex Chiang printk(KERN_ERR 8986ff0bc94SAlex Chiang "ia64_sal_pltid failed with %ld\n", 8996ff0bc94SAlex Chiang status); 900e927ecb0SSuresh Siddha return; 901e927ecb0SSuresh Siddha } 902e927ecb0SSuresh Siddha 903e927ecb0SSuresh Siddha c->socket_id = (pltid << 8) | info.overview_ppid; 904113134fcSAlex Chiang 905113134fcSAlex Chiang if (info.overview_cpp == 1 && info.overview_tpc == 1) 906113134fcSAlex Chiang return; 907113134fcSAlex Chiang 908e927ecb0SSuresh Siddha c->cores_per_socket = info.overview_cpp; 909e927ecb0SSuresh Siddha c->threads_per_core = info.overview_tpc; 9104129a953SFenghua Yu c->num_log = info.overview_num_log; 911e927ecb0SSuresh Siddha 912e927ecb0SSuresh Siddha c->core_id = info.log1_cid; 913e927ecb0SSuresh Siddha c->thread_id = info.log1_tid; 914e927ecb0SSuresh Siddha } 915dd562c05SStephane Eranian 916dd562c05SStephane Eranian /* 917dd562c05SStephane Eranian * returns non zero, if multi-threading is enabled 918dd562c05SStephane Eranian * on at least one physical package. Due to hotplug cpu 919dd562c05SStephane Eranian * and (maxcpus=), all threads may not necessarily be enabled 920dd562c05SStephane Eranian * even though the processor supports multi-threading. 921dd562c05SStephane Eranian */ 922dd562c05SStephane Eranian int is_multithreading_enabled(void) 923dd562c05SStephane Eranian { 924dd562c05SStephane Eranian int i, j; 925dd562c05SStephane Eranian 926dd562c05SStephane Eranian for_each_present_cpu(i) { 927dd562c05SStephane Eranian for_each_present_cpu(j) { 928dd562c05SStephane Eranian if (j == i) 929dd562c05SStephane Eranian continue; 930dd562c05SStephane Eranian if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { 931dd562c05SStephane Eranian if (cpu_data(j)->core_id == cpu_data(i)->core_id) 932dd562c05SStephane Eranian return 1; 933dd562c05SStephane Eranian } 934dd562c05SStephane Eranian } 935dd562c05SStephane Eranian } 936dd562c05SStephane Eranian return 0; 937dd562c05SStephane Eranian } 938dd562c05SStephane Eranian EXPORT_SYMBOL_GPL(is_multithreading_enabled); 939