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Diffstat (limited to 'arch/tile/kernel/smpboot.c')
-rw-r--r--arch/tile/kernel/smpboot.c269
1 files changed, 0 insertions, 269 deletions
diff --git a/arch/tile/kernel/smpboot.c b/arch/tile/kernel/smpboot.c
deleted file mode 100644
index 869c22e57561..000000000000
--- a/arch/tile/kernel/smpboot.c
+++ /dev/null
@@ -1,269 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/sched/mm.h>
-#include <linux/sched/task.h>
-#include <linux/kernel_stat.h>
-#include <linux/bootmem.h>
-#include <linux/notifier.h>
-#include <linux/cpu.h>
-#include <linux/percpu.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/irq.h>
-#include <asm/mmu_context.h>
-#include <asm/tlbflush.h>
-#include <asm/sections.h>
-
-/* State of each CPU. */
-static DEFINE_PER_CPU(int, cpu_state) = { 0 };
-
-/* The messaging code jumps to this pointer during boot-up */
-unsigned long start_cpu_function_addr;
-
-/* Called very early during startup to mark boot cpu as online */
-void __init smp_prepare_boot_cpu(void)
-{
- int cpu = smp_processor_id();
- set_cpu_online(cpu, 1);
- set_cpu_present(cpu, 1);
- __this_cpu_write(cpu_state, CPU_ONLINE);
-
- init_messaging();
-}
-
-static void start_secondary(void);
-
-/*
- * Called at the top of init() to launch all the other CPUs.
- * They run free to complete their initialization and then wait
- * until they get an IPI from the boot cpu to come online.
- */
-void __init smp_prepare_cpus(unsigned int max_cpus)
-{
- long rc;
- int cpu, cpu_count;
- int boot_cpu = smp_processor_id();
-
- current_thread_info()->cpu = boot_cpu;
-
- /*
- * Pin this task to the boot CPU while we bring up the others,
- * just to make sure we don't uselessly migrate as they come up.
- */
- rc = sched_setaffinity(current->pid, cpumask_of(boot_cpu));
- if (rc != 0)
- pr_err("Couldn't set init affinity to boot cpu (%ld)\n", rc);
-
- /* Print information about disabled and dataplane cpus. */
- print_disabled_cpus();
-
- /*
- * Tell the messaging subsystem how to respond to the
- * startup message. We use a level of indirection to avoid
- * confusing the linker with the fact that the messaging
- * subsystem is calling __init code.
- */
- start_cpu_function_addr = (unsigned long) &online_secondary;
-
- /* Set up thread context for all new processors. */
- cpu_count = 1;
- for (cpu = 0; cpu < NR_CPUS; ++cpu) {
- struct task_struct *idle;
-
- if (cpu == boot_cpu)
- continue;
-
- if (!cpu_possible(cpu)) {
- /*
- * Make this processor do nothing on boot.
- * Note that we don't give the boot_pc function
- * a stack, so it has to be assembly code.
- */
- per_cpu(boot_sp, cpu) = 0;
- per_cpu(boot_pc, cpu) = (unsigned long) smp_nap;
- continue;
- }
-
- /* Create a new idle thread to run start_secondary() */
- idle = fork_idle(cpu);
- if (IS_ERR(idle))
- panic("failed fork for CPU %d", cpu);
- idle->thread.pc = (unsigned long) start_secondary;
-
- /* Make this thread the boot thread for this processor */
- per_cpu(boot_sp, cpu) = task_ksp0(idle);
- per_cpu(boot_pc, cpu) = idle->thread.pc;
-
- ++cpu_count;
- }
- BUG_ON(cpu_count > (max_cpus ? max_cpus : 1));
-
- /* Fire up the other tiles, if any */
- init_cpu_present(cpu_possible_mask);
- if (cpumask_weight(cpu_present_mask) > 1) {
- mb(); /* make sure all data is visible to new processors */
- hv_start_all_tiles();
- }
-}
-
-static __initdata struct cpumask init_affinity;
-
-static __init int reset_init_affinity(void)
-{
- long rc = sched_setaffinity(current->pid, &init_affinity);
- if (rc != 0)
- pr_warn("couldn't reset init affinity (%ld)\n", rc);
- return 0;
-}
-late_initcall(reset_init_affinity);
-
-static struct cpumask cpu_started;
-
-/*
- * Activate a secondary processor. Very minimal; don't add anything
- * to this path without knowing what you're doing, since SMP booting
- * is pretty fragile.
- */
-static void start_secondary(void)
-{
- int cpuid;
-
- preempt_disable();
-
- cpuid = smp_processor_id();
-
- /* Set our thread pointer appropriately. */
- set_my_cpu_offset(__per_cpu_offset[cpuid]);
-
- /*
- * In large machines even this will slow us down, since we
- * will be contending for for the printk spinlock.
- */
- /* printk(KERN_DEBUG "Initializing CPU#%d\n", cpuid); */
-
- /* Initialize the current asid for our first page table. */
- __this_cpu_write(current_asid, min_asid);
-
- /* Set up this thread as another owner of the init_mm */
- mmgrab(&init_mm);
- current->active_mm = &init_mm;
- if (current->mm)
- BUG();
- enter_lazy_tlb(&init_mm, current);
-
- /* Allow hypervisor messages to be received */
- init_messaging();
- local_irq_enable();
-
- /* Indicate that we're ready to come up. */
- /* Must not do this before we're ready to receive messages */
- if (cpumask_test_and_set_cpu(cpuid, &cpu_started)) {
- pr_warn("CPU#%d already started!\n", cpuid);
- for (;;)
- local_irq_enable();
- }
-
- smp_nap();
-}
-
-/*
- * Bring a secondary processor online.
- */
-void online_secondary(void)
-{
- /*
- * low-memory mappings have been cleared, flush them from
- * the local TLBs too.
- */
- local_flush_tlb();
-
- BUG_ON(in_interrupt());
-
- /* This must be done before setting cpu_online_mask */
- wmb();
-
- notify_cpu_starting(smp_processor_id());
-
- set_cpu_online(smp_processor_id(), 1);
- __this_cpu_write(cpu_state, CPU_ONLINE);
-
- /* Set up tile-specific state for this cpu. */
- setup_cpu(0);
-
- /* Set up tile-timer clock-event device on this cpu */
- setup_tile_timer();
-
- cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
-}
-
-int __cpu_up(unsigned int cpu, struct task_struct *tidle)
-{
- /* Wait 5s total for all CPUs for them to come online */
- static int timeout;
- for (; !cpumask_test_cpu(cpu, &cpu_started); timeout++) {
- if (timeout >= 50000) {
- pr_info("skipping unresponsive cpu%d\n", cpu);
- local_irq_enable();
- return -EIO;
- }
- udelay(100);
- }
-
- local_irq_enable();
- per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
-
- /* Unleash the CPU! */
- send_IPI_single(cpu, MSG_TAG_START_CPU);
- while (!cpumask_test_cpu(cpu, cpu_online_mask))
- cpu_relax();
- return 0;
-}
-
-static void panic_start_cpu(void)
-{
- panic("Received a MSG_START_CPU IPI after boot finished.");
-}
-
-void __init smp_cpus_done(unsigned int max_cpus)
-{
- int cpu, next, rc;
-
- /* Reset the response to a (now illegal) MSG_START_CPU IPI. */
- start_cpu_function_addr = (unsigned long) &panic_start_cpu;
-
- cpumask_copy(&init_affinity, cpu_online_mask);
-
- /*
- * Pin ourselves to a single cpu in the initial affinity set
- * so that kernel mappings for the rootfs are not in the dataplane,
- * if set, and to avoid unnecessary migrating during bringup.
- * Use the last cpu just in case the whole chip has been
- * isolated from the scheduler, to keep init away from likely
- * more useful user code. This also ensures that work scheduled
- * via schedule_delayed_work() in the init routines will land
- * on this cpu.
- */
- for (cpu = cpumask_first(&init_affinity);
- (next = cpumask_next(cpu, &init_affinity)) < nr_cpu_ids;
- cpu = next)
- ;
- rc = sched_setaffinity(current->pid, cpumask_of(cpu));
- if (rc != 0)
- pr_err("Couldn't set init affinity to cpu %d (%d)\n", cpu, rc);
-}