diff options
author | Rabin Vincent <rabin@rab.in> | 2015-02-19 17:35:28 +0100 |
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committer | Jesper Nilsson <jespern@axis.com> | 2015-03-25 10:55:10 +0100 |
commit | 47a8f6fb349c977ff752f979b159aef96a0bb352 (patch) | |
tree | 53c52b00d97eb5b0e284b67d66f09ed7ab9a5744 /arch/cris/arch-v32/kernel/smp.c | |
parent | 06aca92424c2a53a9e26cb81c1d6a829af9491b8 (diff) | |
download | linux-47a8f6fb349c977ff752f979b159aef96a0bb352.tar.bz2 |
CRIS: remove SMP code
The CRIS SMP code cannot be built since there is no (and appears to
never have been) a CONFIG_SMP Kconfig option in arch/cris/. Remove it.
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Jesper Nilsson <jespern@axis.com>
Diffstat (limited to 'arch/cris/arch-v32/kernel/smp.c')
-rw-r--r-- | arch/cris/arch-v32/kernel/smp.c | 358 |
1 files changed, 0 insertions, 358 deletions
diff --git a/arch/cris/arch-v32/kernel/smp.c b/arch/cris/arch-v32/kernel/smp.c deleted file mode 100644 index 0698582467ca..000000000000 --- a/arch/cris/arch-v32/kernel/smp.c +++ /dev/null @@ -1,358 +0,0 @@ -#include <linux/types.h> -#include <asm/delay.h> -#include <irq.h> -#include <hwregs/intr_vect.h> -#include <hwregs/intr_vect_defs.h> -#include <asm/tlbflush.h> -#include <asm/mmu_context.h> -#include <hwregs/asm/mmu_defs_asm.h> -#include <hwregs/supp_reg.h> -#include <linux/atomic.h> - -#include <linux/err.h> -#include <linux/init.h> -#include <linux/timex.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/cpumask.h> -#include <linux/interrupt.h> -#include <linux/module.h> - -#define IPI_SCHEDULE 1 -#define IPI_CALL 2 -#define IPI_FLUSH_TLB 4 -#define IPI_BOOT 8 - -#define FLUSH_ALL (void*)0xffffffff - -/* Vector of locks used for various atomic operations */ -spinlock_t cris_atomic_locks[] = { - [0 ... LOCK_COUNT - 1] = __SPIN_LOCK_UNLOCKED(cris_atomic_locks) -}; - -/* CPU masks */ -cpumask_t phys_cpu_present_map = CPU_MASK_NONE; -EXPORT_SYMBOL(phys_cpu_present_map); - -/* Variables used during SMP boot */ -volatile int cpu_now_booting = 0; -volatile struct thread_info *smp_init_current_idle_thread; - -/* Variables used during IPI */ -static DEFINE_SPINLOCK(call_lock); -static DEFINE_SPINLOCK(tlbstate_lock); - -struct call_data_struct { - void (*func) (void *info); - void *info; - int wait; -}; - -static struct call_data_struct * call_data; - -static struct mm_struct* flush_mm; -static struct vm_area_struct* flush_vma; -static unsigned long flush_addr; - -/* Mode registers */ -static unsigned long irq_regs[NR_CPUS] = { - regi_irq, - regi_irq2 -}; - -static irqreturn_t crisv32_ipi_interrupt(int irq, void *dev_id); -static int send_ipi(int vector, int wait, cpumask_t cpu_mask); -static struct irqaction irq_ipi = { - .handler = crisv32_ipi_interrupt, - .flags = 0, - .name = "ipi", -}; - -extern void cris_mmu_init(void); -extern void cris_timer_init(void); - -/* SMP initialization */ -void __init smp_prepare_cpus(unsigned int max_cpus) -{ - int i; - - /* From now on we can expect IPIs so set them up */ - setup_irq(IPI_INTR_VECT, &irq_ipi); - - /* Mark all possible CPUs as present */ - for (i = 0; i < max_cpus; i++) - cpumask_set_cpu(i, &phys_cpu_present_map); -} - -void smp_prepare_boot_cpu(void) -{ - /* PGD pointer has moved after per_cpu initialization so - * update the MMU. - */ - pgd_t **pgd; - pgd = (pgd_t**)&per_cpu(current_pgd, smp_processor_id()); - - SUPP_BANK_SEL(1); - SUPP_REG_WR(RW_MM_TLB_PGD, pgd); - SUPP_BANK_SEL(2); - SUPP_REG_WR(RW_MM_TLB_PGD, pgd); - - set_cpu_online(0, true); - cpumask_set_cpu(0, &phys_cpu_present_map); - set_cpu_possible(0, true); -} - -void __init smp_cpus_done(unsigned int max_cpus) -{ -} - -/* Bring one cpu online.*/ -static int __init -smp_boot_one_cpu(int cpuid, struct task_struct idle) -{ - unsigned timeout; - cpumask_t cpu_mask; - - cpumask_clear(&cpu_mask); - task_thread_info(idle)->cpu = cpuid; - - /* Information to the CPU that is about to boot */ - smp_init_current_idle_thread = task_thread_info(idle); - cpu_now_booting = cpuid; - - /* Kick it */ - set_cpu_online(cpuid, true); - cpumask_set_cpu(cpuid, &cpu_mask); - send_ipi(IPI_BOOT, 0, cpu_mask); - set_cpu_online(cpuid, false); - - /* Wait for CPU to come online */ - for (timeout = 0; timeout < 10000; timeout++) { - if(cpu_online(cpuid)) { - cpu_now_booting = 0; - smp_init_current_idle_thread = NULL; - return 0; /* CPU online */ - } - udelay(100); - barrier(); - } - - printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); - return -1; -} - -/* Secondary CPUs starts using C here. Here we need to setup CPU - * specific stuff such as the local timer and the MMU. */ -void __init smp_callin(void) -{ - int cpu = cpu_now_booting; - reg_intr_vect_rw_mask vect_mask = {0}; - - /* Initialise the idle task for this CPU */ - atomic_inc(&init_mm.mm_count); - current->active_mm = &init_mm; - - /* Set up MMU */ - cris_mmu_init(); - __flush_tlb_all(); - - /* Setup local timer. */ - cris_timer_init(); - - /* Enable IRQ and idle */ - REG_WR(intr_vect, irq_regs[cpu], rw_mask, vect_mask); - crisv32_unmask_irq(IPI_INTR_VECT); - crisv32_unmask_irq(TIMER0_INTR_VECT); - preempt_disable(); - notify_cpu_starting(cpu); - local_irq_enable(); - - set_cpu_online(cpu, true); - cpu_startup_entry(CPUHP_ONLINE); -} - -/* Stop execution on this CPU.*/ -void stop_this_cpu(void* dummy) -{ - local_irq_disable(); - asm volatile("halt"); -} - -/* Other calls */ -void smp_send_stop(void) -{ - smp_call_function(stop_this_cpu, NULL, 0); -} - -int setup_profiling_timer(unsigned int multiplier) -{ - return -EINVAL; -} - - -/* cache_decay_ticks is used by the scheduler to decide if a process - * is "hot" on one CPU. A higher value means a higher penalty to move - * a process to another CPU. Our cache is rather small so we report - * 1 tick. - */ -unsigned long cache_decay_ticks = 1; - -int __cpu_up(unsigned int cpu, struct task_struct *tidle) -{ - smp_boot_one_cpu(cpu, tidle); - return cpu_online(cpu) ? 0 : -ENOSYS; -} - -void smp_send_reschedule(int cpu) -{ - cpumask_t cpu_mask; - cpumask_clear(&cpu_mask); - cpumask_set_cpu(cpu, &cpu_mask); - send_ipi(IPI_SCHEDULE, 0, cpu_mask); -} - -/* TLB flushing - * - * Flush needs to be done on the local CPU and on any other CPU that - * may have the same mapping. The mm->cpu_vm_mask is used to keep track - * of which CPUs that a specific process has been executed on. - */ -void flush_tlb_common(struct mm_struct* mm, struct vm_area_struct* vma, unsigned long addr) -{ - unsigned long flags; - cpumask_t cpu_mask; - - spin_lock_irqsave(&tlbstate_lock, flags); - cpu_mask = (mm == FLUSH_ALL ? cpu_all_mask : *mm_cpumask(mm)); - cpumask_clear_cpu(smp_processor_id(), &cpu_mask); - flush_mm = mm; - flush_vma = vma; - flush_addr = addr; - send_ipi(IPI_FLUSH_TLB, 1, cpu_mask); - spin_unlock_irqrestore(&tlbstate_lock, flags); -} - -void flush_tlb_all(void) -{ - __flush_tlb_all(); - flush_tlb_common(FLUSH_ALL, FLUSH_ALL, 0); -} - -void flush_tlb_mm(struct mm_struct *mm) -{ - __flush_tlb_mm(mm); - flush_tlb_common(mm, FLUSH_ALL, 0); - /* No more mappings in other CPUs */ - cpumask_clear(mm_cpumask(mm)); - cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); -} - -void flush_tlb_page(struct vm_area_struct *vma, - unsigned long addr) -{ - __flush_tlb_page(vma, addr); - flush_tlb_common(vma->vm_mm, vma, addr); -} - -/* Inter processor interrupts - * - * The IPIs are used for: - * * Force a schedule on a CPU - * * FLush TLB on other CPUs - * * Call a function on other CPUs - */ - -int send_ipi(int vector, int wait, cpumask_t cpu_mask) -{ - int i = 0; - reg_intr_vect_rw_ipi ipi = REG_RD(intr_vect, irq_regs[i], rw_ipi); - int ret = 0; - - /* Calculate CPUs to send to. */ - cpumask_and(&cpu_mask, &cpu_mask, cpu_online_mask); - - /* Send the IPI. */ - for_each_cpu(i, &cpu_mask) - { - ipi.vector |= vector; - REG_WR(intr_vect, irq_regs[i], rw_ipi, ipi); - } - - /* Wait for IPI to finish on other CPUS */ - if (wait) { - for_each_cpu(i, &cpu_mask) { - int j; - for (j = 0 ; j < 1000; j++) { - ipi = REG_RD(intr_vect, irq_regs[i], rw_ipi); - if (!ipi.vector) - break; - udelay(100); - } - - /* Timeout? */ - if (ipi.vector) { - printk("SMP call timeout from %d to %d\n", smp_processor_id(), i); - ret = -ETIMEDOUT; - dump_stack(); - } - } - } - return ret; -} - -/* - * You must not call this function with disabled interrupts or from a - * hardware interrupt handler or from a bottom half handler. - */ -int smp_call_function(void (*func)(void *info), void *info, int wait) -{ - cpumask_t cpu_mask; - struct call_data_struct data; - int ret; - - cpumask_setall(&cpu_mask); - cpumask_clear_cpu(smp_processor_id(), &cpu_mask); - - WARN_ON(irqs_disabled()); - - data.func = func; - data.info = info; - data.wait = wait; - - spin_lock(&call_lock); - call_data = &data; - ret = send_ipi(IPI_CALL, wait, cpu_mask); - spin_unlock(&call_lock); - - return ret; -} - -irqreturn_t crisv32_ipi_interrupt(int irq, void *dev_id) -{ - void (*func) (void *info) = call_data->func; - void *info = call_data->info; - reg_intr_vect_rw_ipi ipi; - - ipi = REG_RD(intr_vect, irq_regs[smp_processor_id()], rw_ipi); - - if (ipi.vector & IPI_SCHEDULE) { - scheduler_ipi(); - } - if (ipi.vector & IPI_CALL) { - func(info); - } - if (ipi.vector & IPI_FLUSH_TLB) { - if (flush_mm == FLUSH_ALL) - __flush_tlb_all(); - else if (flush_vma == FLUSH_ALL) - __flush_tlb_mm(flush_mm); - else - __flush_tlb_page(flush_vma, flush_addr); - } - - ipi.vector = 0; - REG_WR(intr_vect, irq_regs[smp_processor_id()], rw_ipi, ipi); - - return IRQ_HANDLED; -} - |