diff options
Diffstat (limited to 'arch/ia64/kernel/smpboot.c')
| -rw-r--r-- | arch/ia64/kernel/smpboot.c | 839 |
1 files changed, 0 insertions, 839 deletions
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c deleted file mode 100644 index d0e935cf20..0000000000 --- a/arch/ia64/kernel/smpboot.c +++ /dev/null @@ -1,839 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * SMP boot-related support - * - * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co - * David Mosberger-Tang <davidm@hpl.hp.com> - * Copyright (C) 2001, 2004-2005 Intel Corp - * Rohit Seth <rohit.seth@intel.com> - * Suresh Siddha <suresh.b.siddha@intel.com> - * Gordon Jin <gordon.jin@intel.com> - * Ashok Raj <ashok.raj@intel.com> - * - * 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here. - * 01/04/27 David Mosberger <davidm@hpl.hp.com> Added ITC synching code. - * 02/07/31 David Mosberger <davidm@hpl.hp.com> Switch over to hotplug-CPU boot-sequence. - * smp_boot_cpus()/smp_commence() is replaced by - * smp_prepare_cpus()/__cpu_up()/smp_cpus_done(). - * 04/06/21 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support - * 04/12/26 Jin Gordon <gordon.jin@intel.com> - * 04/12/26 Rohit Seth <rohit.seth@intel.com> - * Add multi-threading and multi-core detection - * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com> - * Setup cpu_sibling_map and cpu_core_map - */ - -#include <linux/module.h> -#include <linux/acpi.h> -#include <linux/memblock.h> -#include <linux/cpu.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/kernel.h> -#include <linux/kernel_stat.h> -#include <linux/mm.h> -#include <linux/notifier.h> -#include <linux/smp.h> -#include <linux/spinlock.h> -#include <linux/efi.h> -#include <linux/percpu.h> -#include <linux/bitops.h> - -#include <linux/atomic.h> -#include <asm/cache.h> -#include <asm/current.h> -#include <asm/delay.h> -#include <asm/efi.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/mca.h> -#include <asm/page.h> -#include <asm/processor.h> -#include <asm/ptrace.h> -#include <asm/sal.h> -#include <asm/tlbflush.h> -#include <asm/unistd.h> - -#define SMP_DEBUG 0 - -#if SMP_DEBUG -#define Dprintk(x...) printk(x) -#else -#define Dprintk(x...) -#endif - -#ifdef CONFIG_HOTPLUG_CPU -#ifdef CONFIG_PERMIT_BSP_REMOVE -#define bsp_remove_ok 1 -#else -#define bsp_remove_ok 0 -#endif - -/* - * Global array allocated for NR_CPUS at boot time - */ -struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS]; - -/* - * start_ap in head.S uses this to store current booting cpu - * info. - */ -struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0]; - -#define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]); - -#else -#define set_brendez_area(x) -#endif - - -/* - * ITC synchronization related stuff: - */ -#define MASTER (0) -#define SLAVE (SMP_CACHE_BYTES/8) - -#define NUM_ROUNDS 64 /* magic value */ -#define NUM_ITERS 5 /* likewise */ - -static DEFINE_SPINLOCK(itc_sync_lock); -static volatile unsigned long go[SLAVE + 1]; - -#define DEBUG_ITC_SYNC 0 - -extern void start_ap (void); -extern unsigned long ia64_iobase; - -struct task_struct *task_for_booting_cpu; - -/* - * State for each CPU - */ -DEFINE_PER_CPU(int, cpu_state); - -cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; -EXPORT_SYMBOL(cpu_core_map); -DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); -EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); - -int smp_num_siblings = 1; - -/* which logical CPU number maps to which CPU (physical APIC ID) */ -volatile int ia64_cpu_to_sapicid[NR_CPUS]; -EXPORT_SYMBOL(ia64_cpu_to_sapicid); - -static cpumask_t cpu_callin_map; - -struct smp_boot_data smp_boot_data __initdata; - -unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ - -char __initdata no_int_routing; - -unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ - -#ifdef CONFIG_FORCE_CPEI_RETARGET -#define CPEI_OVERRIDE_DEFAULT (1) -#else -#define CPEI_OVERRIDE_DEFAULT (0) -#endif - -unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; - -static int __init -cmdl_force_cpei(char *str) -{ - int value=0; - - get_option (&str, &value); - force_cpei_retarget = value; - - return 1; -} - -__setup("force_cpei=", cmdl_force_cpei); - -static int __init -nointroute (char *str) -{ - no_int_routing = 1; - printk ("no_int_routing on\n"); - return 1; -} - -__setup("nointroute", nointroute); - -static void fix_b0_for_bsp(void) -{ -#ifdef CONFIG_HOTPLUG_CPU - int cpuid; - static int fix_bsp_b0 = 1; - - cpuid = smp_processor_id(); - - /* - * Cache the b0 value on the first AP that comes up - */ - if (!(fix_bsp_b0 && cpuid)) - return; - - sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0]; - printk ("Fixed BSP b0 value from CPU %d\n", cpuid); - - fix_bsp_b0 = 0; -#endif -} - -void -sync_master (void *arg) -{ - unsigned long flags, i; - - go[MASTER] = 0; - - local_irq_save(flags); - { - for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) { - while (!go[MASTER]) - cpu_relax(); - go[MASTER] = 0; - go[SLAVE] = ia64_get_itc(); - } - } - local_irq_restore(flags); -} - -/* - * Return the number of cycles by which our itc differs from the itc on the master - * (time-keeper) CPU. A positive number indicates our itc is ahead of the master, - * negative that it is behind. - */ -static inline long -get_delta (long *rt, long *master) -{ - unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; - unsigned long tcenter, t0, t1, tm; - long i; - - for (i = 0; i < NUM_ITERS; ++i) { - t0 = ia64_get_itc(); - go[MASTER] = 1; - while (!(tm = go[SLAVE])) - cpu_relax(); - go[SLAVE] = 0; - t1 = ia64_get_itc(); - - if (t1 - t0 < best_t1 - best_t0) - best_t0 = t0, best_t1 = t1, best_tm = tm; - } - - *rt = best_t1 - best_t0; - *master = best_tm - best_t0; - - /* average best_t0 and best_t1 without overflow: */ - tcenter = (best_t0/2 + best_t1/2); - if (best_t0 % 2 + best_t1 % 2 == 2) - ++tcenter; - return tcenter - best_tm; -} - -/* - * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU - * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of - * unaccounted-for errors (such as getting a machine check in the middle of a calibration - * step). The basic idea is for the slave to ask the master what itc value it has and to - * read its own itc before and after the master responds. Each iteration gives us three - * timestamps: - * - * slave master - * - * t0 ---\ - * ---\ - * ---> - * tm - * /--- - * /--- - * t1 <--- - * - * - * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0 - * and t1. If we achieve this, the clocks are synchronized provided the interconnect - * between the slave and the master is symmetric. Even if the interconnect were - * asymmetric, we would still know that the synchronization error is smaller than the - * roundtrip latency (t0 - t1). - * - * When the interconnect is quiet and symmetric, this lets us synchronize the itc to - * within one or two cycles. However, we can only *guarantee* that the synchronization is - * accurate to within a round-trip time, which is typically in the range of several - * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually - * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better - * than half a micro second or so. - */ -void -ia64_sync_itc (unsigned int master) -{ - long i, delta, adj, adjust_latency = 0, done = 0; - unsigned long flags, rt, master_time_stamp, bound; -#if DEBUG_ITC_SYNC - struct { - long rt; /* roundtrip time */ - long master; /* master's timestamp */ - long diff; /* difference between midpoint and master's timestamp */ - long lat; /* estimate of itc adjustment latency */ - } t[NUM_ROUNDS]; -#endif - - /* - * Make sure local timer ticks are disabled while we sync. If - * they were enabled, we'd have to worry about nasty issues - * like setting the ITC ahead of (or a long time before) the - * next scheduled tick. - */ - BUG_ON((ia64_get_itv() & (1 << 16)) == 0); - - go[MASTER] = 1; - - if (smp_call_function_single(master, sync_master, NULL, 0) < 0) { - printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); - return; - } - - while (go[MASTER]) - cpu_relax(); /* wait for master to be ready */ - - spin_lock_irqsave(&itc_sync_lock, flags); - { - for (i = 0; i < NUM_ROUNDS; ++i) { - delta = get_delta(&rt, &master_time_stamp); - if (delta == 0) { - done = 1; /* let's lock on to this... */ - bound = rt; - } - - if (!done) { - if (i > 0) { - adjust_latency += -delta; - adj = -delta + adjust_latency/4; - } else - adj = -delta; - - ia64_set_itc(ia64_get_itc() + adj); - } -#if DEBUG_ITC_SYNC - t[i].rt = rt; - t[i].master = master_time_stamp; - t[i].diff = delta; - t[i].lat = adjust_latency/4; -#endif - } - } - spin_unlock_irqrestore(&itc_sync_lock, flags); - -#if DEBUG_ITC_SYNC - for (i = 0; i < NUM_ROUNDS; ++i) - printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", - t[i].rt, t[i].master, t[i].diff, t[i].lat); -#endif - - printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, " - "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt); -} - -/* - * Ideally sets up per-cpu profiling hooks. Doesn't do much now... - */ -static inline void smp_setup_percpu_timer(void) -{ -} - -static void -smp_callin (void) -{ - int cpuid, phys_id, itc_master; - struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; - extern void ia64_init_itm(void); - extern volatile int time_keeper_id; - - cpuid = smp_processor_id(); - phys_id = hard_smp_processor_id(); - itc_master = time_keeper_id; - - if (cpu_online(cpuid)) { - printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n", - phys_id, cpuid); - BUG(); - } - - fix_b0_for_bsp(); - - /* - * numa_node_id() works after this. - */ - set_numa_node(cpu_to_node_map[cpuid]); - set_numa_mem(local_memory_node(cpu_to_node_map[cpuid])); - - spin_lock(&vector_lock); - /* Setup the per cpu irq handling data structures */ - __setup_vector_irq(cpuid); - notify_cpu_starting(cpuid); - set_cpu_online(cpuid, true); - per_cpu(cpu_state, cpuid) = CPU_ONLINE; - spin_unlock(&vector_lock); - - smp_setup_percpu_timer(); - - ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ - - local_irq_enable(); - - if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) { - /* - * Synchronize the ITC with the BP. Need to do this after irqs are - * enabled because ia64_sync_itc() calls smp_call_function_single(), which - * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls - * local_bh_enable(), which bugs out if irqs are not enabled... - */ - Dprintk("Going to syncup ITC with ITC Master.\n"); - ia64_sync_itc(itc_master); - } - - /* - * Get our bogomips. - */ - ia64_init_itm(); - - /* - * Delay calibration can be skipped if new processor is identical to the - * previous processor. - */ - last_cpuinfo = cpu_data(cpuid - 1); - this_cpuinfo = local_cpu_data; - if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq || - last_cpuinfo->proc_freq != this_cpuinfo->proc_freq || - last_cpuinfo->features != this_cpuinfo->features || - last_cpuinfo->revision != this_cpuinfo->revision || - last_cpuinfo->family != this_cpuinfo->family || - last_cpuinfo->archrev != this_cpuinfo->archrev || - last_cpuinfo->model != this_cpuinfo->model) - calibrate_delay(); - local_cpu_data->loops_per_jiffy = loops_per_jiffy; - - /* - * Allow the master to continue. - */ - cpumask_set_cpu(cpuid, &cpu_callin_map); - Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid); -} - - -/* - * Activate a secondary processor. head.S calls this. - */ -int -start_secondary (void *unused) -{ - /* Early console may use I/O ports */ - ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); -#ifndef CONFIG_PRINTK_TIME - Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); -#endif - efi_map_pal_code(); - cpu_init(); - smp_callin(); - - cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); - return 0; -} - -static int -do_boot_cpu (int sapicid, int cpu, struct task_struct *idle) -{ - int timeout; - - task_for_booting_cpu = idle; - Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); - - set_brendez_area(cpu); - ia64_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); - - /* - * Wait 10s total for the AP to start - */ - Dprintk("Waiting on callin_map ..."); - for (timeout = 0; timeout < 100000; timeout++) { - if (cpumask_test_cpu(cpu, &cpu_callin_map)) - break; /* It has booted */ - barrier(); /* Make sure we re-read cpu_callin_map */ - udelay(100); - } - Dprintk("\n"); - - if (!cpumask_test_cpu(cpu, &cpu_callin_map)) { - printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); - ia64_cpu_to_sapicid[cpu] = -1; - set_cpu_online(cpu, false); /* was set in smp_callin() */ - return -EINVAL; - } - return 0; -} - -static int __init -decay (char *str) -{ - int ticks; - get_option (&str, &ticks); - return 1; -} - -__setup("decay=", decay); - -/* - * Initialize the logical CPU number to SAPICID mapping - */ -void __init -smp_build_cpu_map (void) -{ - int sapicid, cpu, i; - int boot_cpu_id = hard_smp_processor_id(); - - for (cpu = 0; cpu < NR_CPUS; cpu++) { - ia64_cpu_to_sapicid[cpu] = -1; - } - - ia64_cpu_to_sapicid[0] = boot_cpu_id; - init_cpu_present(cpumask_of(0)); - set_cpu_possible(0, true); - for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { - sapicid = smp_boot_data.cpu_phys_id[i]; - if (sapicid == boot_cpu_id) - continue; - set_cpu_present(cpu, true); - set_cpu_possible(cpu, true); - ia64_cpu_to_sapicid[cpu] = sapicid; - cpu++; - } -} - -/* - * Cycle through the APs sending Wakeup IPIs to boot each. - */ -void __init -smp_prepare_cpus (unsigned int max_cpus) -{ - int boot_cpu_id = hard_smp_processor_id(); - - /* - * Initialize the per-CPU profiling counter/multiplier - */ - - smp_setup_percpu_timer(); - - cpumask_set_cpu(0, &cpu_callin_map); - - local_cpu_data->loops_per_jiffy = loops_per_jiffy; - ia64_cpu_to_sapicid[0] = boot_cpu_id; - - printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); - - current_thread_info()->cpu = 0; - - /* - * If SMP should be disabled, then really disable it! - */ - if (!max_cpus) { - printk(KERN_INFO "SMP mode deactivated.\n"); - init_cpu_online(cpumask_of(0)); - init_cpu_present(cpumask_of(0)); - init_cpu_possible(cpumask_of(0)); - return; - } -} - -void smp_prepare_boot_cpu(void) -{ - set_cpu_online(smp_processor_id(), true); - cpumask_set_cpu(smp_processor_id(), &cpu_callin_map); - set_numa_node(cpu_to_node_map[smp_processor_id()]); - per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; -} - -#ifdef CONFIG_HOTPLUG_CPU -static inline void -clear_cpu_sibling_map(int cpu) -{ - int i; - - for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu)) - cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, i)); - for_each_cpu(i, &cpu_core_map[cpu]) - cpumask_clear_cpu(cpu, &cpu_core_map[i]); - - per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE; -} - -static void -remove_siblinginfo(int cpu) -{ - if (cpu_data(cpu)->threads_per_core == 1 && - cpu_data(cpu)->cores_per_socket == 1) { - cpumask_clear_cpu(cpu, &cpu_core_map[cpu]); - cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); - return; - } - - /* remove it from all sibling map's */ - clear_cpu_sibling_map(cpu); -} - -extern void fixup_irqs(void); - -int migrate_platform_irqs(unsigned int cpu) -{ - int new_cpei_cpu; - struct irq_data *data = NULL; - const struct cpumask *mask; - int retval = 0; - - /* - * dont permit CPEI target to removed. - */ - if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { - printk ("CPU (%d) is CPEI Target\n", cpu); - if (can_cpei_retarget()) { - /* - * Now re-target the CPEI to a different processor - */ - new_cpei_cpu = cpumask_any(cpu_online_mask); - mask = cpumask_of(new_cpei_cpu); - set_cpei_target_cpu(new_cpei_cpu); - data = irq_get_irq_data(ia64_cpe_irq); - /* - * Switch for now, immediately, we need to do fake intr - * as other interrupts, but need to study CPEI behaviour with - * polling before making changes. - */ - if (data && data->chip) { - data->chip->irq_disable(data); - data->chip->irq_set_affinity(data, mask, false); - data->chip->irq_enable(data); - printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu); - } - } - if (!data) { - printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); - retval = -EBUSY; - } - } - return retval; -} - -/* must be called with cpucontrol mutex held */ -int __cpu_disable(void) -{ - int cpu = smp_processor_id(); - - /* - * dont permit boot processor for now - */ - if (cpu == 0 && !bsp_remove_ok) { - printk ("Your platform does not support removal of BSP\n"); - return (-EBUSY); - } - - set_cpu_online(cpu, false); - - if (migrate_platform_irqs(cpu)) { - set_cpu_online(cpu, true); - return -EBUSY; - } - - remove_siblinginfo(cpu); - fixup_irqs(); - local_flush_tlb_all(); - cpumask_clear_cpu(cpu, &cpu_callin_map); - return 0; -} - -void __cpu_die(unsigned int cpu) -{ - unsigned int i; - - for (i = 0; i < 100; i++) { - /* They ack this in play_dead by setting CPU_DEAD */ - if (per_cpu(cpu_state, cpu) == CPU_DEAD) - { - printk ("CPU %d is now offline\n", cpu); - return; - } - msleep(100); - } - printk(KERN_ERR "CPU %u didn't die...\n", cpu); -} -#endif /* CONFIG_HOTPLUG_CPU */ - -void -smp_cpus_done (unsigned int dummy) -{ - int cpu; - unsigned long bogosum = 0; - - /* - * Allow the user to impress friends. - */ - - for_each_online_cpu(cpu) { - bogosum += cpu_data(cpu)->loops_per_jiffy; - } - - printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", - (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); -} - -static inline void set_cpu_sibling_map(int cpu) -{ - int i; - - for_each_online_cpu(i) { - if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { - cpumask_set_cpu(i, &cpu_core_map[cpu]); - cpumask_set_cpu(cpu, &cpu_core_map[i]); - if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { - cpumask_set_cpu(i, - &per_cpu(cpu_sibling_map, cpu)); - cpumask_set_cpu(cpu, - &per_cpu(cpu_sibling_map, i)); - } - } - } -} - -int -__cpu_up(unsigned int cpu, struct task_struct *tidle) -{ - int ret; - int sapicid; - - sapicid = ia64_cpu_to_sapicid[cpu]; - if (sapicid == -1) - return -EINVAL; - - /* - * Already booted cpu? not valid anymore since we dont - * do idle loop tightspin anymore. - */ - if (cpumask_test_cpu(cpu, &cpu_callin_map)) - return -EINVAL; - - per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; - /* Processor goes to start_secondary(), sets online flag */ - ret = do_boot_cpu(sapicid, cpu, tidle); - if (ret < 0) - return ret; - - if (cpu_data(cpu)->threads_per_core == 1 && - cpu_data(cpu)->cores_per_socket == 1) { - cpumask_set_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); - cpumask_set_cpu(cpu, &cpu_core_map[cpu]); - return 0; - } - - set_cpu_sibling_map(cpu); - - return 0; -} - -/* - * Assume that CPUs have been discovered by some platform-dependent interface. For - * SoftSDV/Lion, that would be ACPI. - * - * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). - */ -void __init -init_smp_config(void) -{ - struct fptr { - unsigned long fp; - unsigned long gp; - } *ap_startup; - long sal_ret; - - /* Tell SAL where to drop the APs. */ - ap_startup = (struct fptr *) start_ap; - sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, - ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); - if (sal_ret < 0) - printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", - ia64_sal_strerror(sal_ret)); -} - -/* - * identify_siblings(cpu) gets called from identify_cpu. This populates the - * information related to logical execution units in per_cpu_data structure. - */ -void identify_siblings(struct cpuinfo_ia64 *c) -{ - long status; - u16 pltid; - pal_logical_to_physical_t info; - - status = ia64_pal_logical_to_phys(-1, &info); - if (status != PAL_STATUS_SUCCESS) { - if (status != PAL_STATUS_UNIMPLEMENTED) { - printk(KERN_ERR - "ia64_pal_logical_to_phys failed with %ld\n", - status); - return; - } - - info.overview_ppid = 0; - info.overview_cpp = 1; - info.overview_tpc = 1; - } - - status = ia64_sal_physical_id_info(&pltid); - if (status != PAL_STATUS_SUCCESS) { - if (status != PAL_STATUS_UNIMPLEMENTED) - printk(KERN_ERR - "ia64_sal_pltid failed with %ld\n", - status); - return; - } - - c->socket_id = (pltid << 8) | info.overview_ppid; - - if (info.overview_cpp == 1 && info.overview_tpc == 1) - return; - - c->cores_per_socket = info.overview_cpp; - c->threads_per_core = info.overview_tpc; - c->num_log = info.overview_num_log; - - c->core_id = info.log1_cid; - c->thread_id = info.log1_tid; -} - -/* - * returns non zero, if multi-threading is enabled - * on at least one physical package. Due to hotplug cpu - * and (maxcpus=), all threads may not necessarily be enabled - * even though the processor supports multi-threading. - */ -int is_multithreading_enabled(void) -{ - int i, j; - - for_each_present_cpu(i) { - for_each_present_cpu(j) { - if (j == i) - continue; - if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { - if (cpu_data(j)->core_id == cpu_data(i)->core_id) - return 1; - } - } - } - return 0; -} -EXPORT_SYMBOL_GPL(is_multithreading_enabled); |