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Diffstat (limited to 'arch/ia64/kernel/smpboot.c')
-rw-r--r--arch/ia64/kernel/smpboot.c853
1 files changed, 0 insertions, 853 deletions
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
deleted file mode 100644
index 6501d9a9a21b..000000000000
--- a/arch/ia64/kernel/smpboot.c
+++ /dev/null
@@ -1,853 +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/io.h>
-#include <asm/irq.h>
-#include <asm/mca.h>
-#include <asm/page.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.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;
-
-#ifdef CONFIG_PERFMON
- extern void pfm_init_percpu(void);
-#endif
-
- 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 */
-
-#ifdef CONFIG_PERFMON
- pfm_init_percpu();
-#endif
-
- 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();
- preempt_disable();
- 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)
-{
- int last = 0;
-
- 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;
- }
-
- last = (cpumask_weight(&cpu_core_map[cpu]) == 1 ? 1 : 0);
-
- /* 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);
generated by cgit (git 2.34.1) at 2024-05-08 06:47:25 +0000