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468 lines
11 KiB
468 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* leon_smp.c: Sparc-Leon SMP support. |
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* |
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* based on sun4m_smp.c |
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* Copyright (C) 1996 David S. Miller ([email protected]) |
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* Copyright (C) 2009 Daniel Hellstrom ([email protected]) Aeroflex Gaisler AB |
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* Copyright (C) 2009 Konrad Eisele ([email protected]) Aeroflex Gaisler AB |
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*/ |
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#include <asm/head.h> |
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#include <linux/kernel.h> |
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#include <linux/sched/mm.h> |
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#include <linux/threads.h> |
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#include <linux/smp.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/of.h> |
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#include <linux/init.h> |
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#include <linux/spinlock.h> |
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#include <linux/mm.h> |
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#include <linux/swap.h> |
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#include <linux/profile.h> |
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#include <linux/pm.h> |
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#include <linux/delay.h> |
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#include <linux/gfp.h> |
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#include <linux/cpu.h> |
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#include <linux/clockchips.h> |
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#include <asm/cacheflush.h> |
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#include <asm/tlbflush.h> |
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#include <asm/ptrace.h> |
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#include <linux/atomic.h> |
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#include <asm/irq_regs.h> |
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#include <asm/traps.h> |
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#include <asm/delay.h> |
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#include <asm/irq.h> |
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#include <asm/page.h> |
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#include <asm/oplib.h> |
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#include <asm/cpudata.h> |
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#include <asm/asi.h> |
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#include <asm/leon.h> |
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#include <asm/leon_amba.h> |
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#include <asm/timer.h> |
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#include "kernel.h" |
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#include "irq.h" |
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extern ctxd_t *srmmu_ctx_table_phys; |
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static int smp_processors_ready; |
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extern volatile unsigned long cpu_callin_map[NR_CPUS]; |
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extern cpumask_t smp_commenced_mask; |
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void leon_configure_cache_smp(void); |
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static void leon_ipi_init(void); |
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/* IRQ number of LEON IPIs */ |
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int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT; |
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static inline unsigned long do_swap(volatile unsigned long *ptr, |
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unsigned long val) |
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{ |
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__asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val) |
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: "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS) |
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: "memory"); |
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return val; |
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} |
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void leon_cpu_pre_starting(void *arg) |
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{ |
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leon_configure_cache_smp(); |
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} |
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void leon_cpu_pre_online(void *arg) |
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{ |
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int cpuid = hard_smp_processor_id(); |
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/* Allow master to continue. The master will then give us the |
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* go-ahead by setting the smp_commenced_mask and will wait without |
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* timeouts until our setup is completed fully (signified by |
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* our bit being set in the cpu_online_mask). |
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*/ |
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do_swap(&cpu_callin_map[cpuid], 1); |
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local_ops->cache_all(); |
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local_ops->tlb_all(); |
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/* Fix idle thread fields. */ |
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__asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(¤t_set[cpuid]) |
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: "memory" /* paranoid */); |
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/* Attach to the address space of init_task. */ |
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mmgrab(&init_mm); |
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current->active_mm = &init_mm; |
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while (!cpumask_test_cpu(cpuid, &smp_commenced_mask)) |
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mb(); |
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} |
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/* |
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* Cycle through the processors asking the PROM to start each one. |
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*/ |
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extern struct linux_prom_registers smp_penguin_ctable; |
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void leon_configure_cache_smp(void) |
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{ |
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unsigned long cfg = sparc_leon3_get_dcachecfg(); |
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int me = smp_processor_id(); |
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if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) { |
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printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n", |
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(unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg), |
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(unsigned int)cfg, (unsigned int)me); |
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sparc_leon3_disable_cache(); |
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} else { |
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if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) { |
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sparc_leon3_enable_snooping(); |
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} else { |
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printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n", |
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me); |
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sparc_leon3_disable_cache(); |
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} |
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} |
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local_ops->cache_all(); |
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local_ops->tlb_all(); |
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} |
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static void leon_smp_setbroadcast(unsigned int mask) |
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{ |
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int broadcast = |
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((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> |
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LEON3_IRQMPSTATUS_BROADCAST) & 1); |
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if (!broadcast) { |
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prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n", |
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leon_smp_nrcpus()); |
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if (leon_smp_nrcpus() > 1) { |
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BUG(); |
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} else { |
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prom_printf("continue anyway\n"); |
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return; |
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} |
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} |
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LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask); |
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} |
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int leon_smp_nrcpus(void) |
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{ |
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int nrcpu = |
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((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >> |
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LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1; |
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return nrcpu; |
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} |
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void __init leon_boot_cpus(void) |
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{ |
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int nrcpu = leon_smp_nrcpus(); |
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int me = smp_processor_id(); |
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/* Setup IPI */ |
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leon_ipi_init(); |
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printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me, |
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(unsigned int)nrcpu, (unsigned int)NR_CPUS, |
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(unsigned int)&(leon3_irqctrl_regs->mpstatus)); |
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leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me); |
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leon_enable_irq_cpu(LEON3_IRQ_TICKER, me); |
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leon_enable_irq_cpu(leon_ipi_irq, me); |
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leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER); |
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leon_configure_cache_smp(); |
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local_ops->cache_all(); |
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} |
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int leon_boot_one_cpu(int i, struct task_struct *idle) |
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{ |
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int timeout; |
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current_set[i] = task_thread_info(idle); |
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/* See trampoline.S:leon_smp_cpu_startup for details... |
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* Initialize the contexts table |
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* Since the call to prom_startcpu() trashes the structure, |
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* we need to re-initialize it for each cpu |
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*/ |
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smp_penguin_ctable.which_io = 0; |
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smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys; |
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smp_penguin_ctable.reg_size = 0; |
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/* whirrr, whirrr, whirrrrrrrrr... */ |
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printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i, |
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(unsigned int)&leon3_irqctrl_regs->mpstatus); |
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local_ops->cache_all(); |
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/* Make sure all IRQs are of from the start for this new CPU */ |
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LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0); |
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/* Wake one CPU */ |
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LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i); |
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/* wheee... it's going... */ |
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for (timeout = 0; timeout < 10000; timeout++) { |
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if (cpu_callin_map[i]) |
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break; |
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udelay(200); |
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} |
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printk(KERN_INFO "Started CPU %d\n", (unsigned int)i); |
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if (!(cpu_callin_map[i])) { |
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printk(KERN_ERR "Processor %d is stuck.\n", i); |
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return -ENODEV; |
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} else { |
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leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i); |
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leon_enable_irq_cpu(LEON3_IRQ_TICKER, i); |
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leon_enable_irq_cpu(leon_ipi_irq, i); |
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} |
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local_ops->cache_all(); |
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return 0; |
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} |
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void __init leon_smp_done(void) |
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{ |
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int i, first; |
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int *prev; |
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/* setup cpu list for irq rotation */ |
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first = 0; |
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prev = &first; |
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for (i = 0; i < NR_CPUS; i++) { |
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if (cpu_online(i)) { |
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*prev = i; |
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prev = &cpu_data(i).next; |
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} |
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} |
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*prev = first; |
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local_ops->cache_all(); |
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/* Free unneeded trap tables */ |
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if (!cpu_present(1)) { |
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free_reserved_page(virt_to_page(&trapbase_cpu1)); |
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} |
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if (!cpu_present(2)) { |
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free_reserved_page(virt_to_page(&trapbase_cpu2)); |
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} |
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if (!cpu_present(3)) { |
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free_reserved_page(virt_to_page(&trapbase_cpu3)); |
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} |
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/* Ok, they are spinning and ready to go. */ |
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smp_processors_ready = 1; |
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} |
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struct leon_ipi_work { |
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int single; |
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int msk; |
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int resched; |
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}; |
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static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work); |
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/* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ |
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* is used for all three types of IPIs. |
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*/ |
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static void __init leon_ipi_init(void) |
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{ |
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int cpu, len; |
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struct leon_ipi_work *work; |
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struct property *pp; |
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struct device_node *rootnp; |
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struct tt_entry *trap_table; |
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unsigned long flags; |
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/* Find IPI IRQ or stick with default value */ |
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rootnp = of_find_node_by_path("/ambapp0"); |
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if (rootnp) { |
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pp = of_find_property(rootnp, "ipi_num", &len); |
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if (pp && (*(int *)pp->value)) |
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leon_ipi_irq = *(int *)pp->value; |
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} |
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printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq); |
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/* Adjust so that we jump directly to smpleon_ipi */ |
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local_irq_save(flags); |
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trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)]; |
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trap_table->inst_three += smpleon_ipi - real_irq_entry; |
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local_ops->cache_all(); |
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local_irq_restore(flags); |
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for_each_possible_cpu(cpu) { |
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work = &per_cpu(leon_ipi_work, cpu); |
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work->single = work->msk = work->resched = 0; |
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} |
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} |
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static void leon_send_ipi(int cpu, int level) |
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{ |
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unsigned long mask; |
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mask = leon_get_irqmask(level); |
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LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask); |
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} |
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static void leon_ipi_single(int cpu) |
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{ |
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struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); |
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/* Mark work */ |
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work->single = 1; |
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/* Generate IRQ on the CPU */ |
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leon_send_ipi(cpu, leon_ipi_irq); |
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} |
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static void leon_ipi_mask_one(int cpu) |
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{ |
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struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); |
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/* Mark work */ |
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work->msk = 1; |
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/* Generate IRQ on the CPU */ |
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leon_send_ipi(cpu, leon_ipi_irq); |
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} |
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static void leon_ipi_resched(int cpu) |
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{ |
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struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu); |
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/* Mark work */ |
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work->resched = 1; |
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/* Generate IRQ on the CPU (any IRQ will cause resched) */ |
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leon_send_ipi(cpu, leon_ipi_irq); |
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} |
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void leonsmp_ipi_interrupt(void) |
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{ |
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struct leon_ipi_work *work = this_cpu_ptr(&leon_ipi_work); |
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if (work->single) { |
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work->single = 0; |
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smp_call_function_single_interrupt(); |
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} |
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if (work->msk) { |
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work->msk = 0; |
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smp_call_function_interrupt(); |
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} |
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if (work->resched) { |
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work->resched = 0; |
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smp_resched_interrupt(); |
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} |
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} |
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static struct smp_funcall { |
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smpfunc_t func; |
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unsigned long arg1; |
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unsigned long arg2; |
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unsigned long arg3; |
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unsigned long arg4; |
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unsigned long arg5; |
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unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */ |
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unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */ |
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} ccall_info __attribute__((aligned(8))); |
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static DEFINE_SPINLOCK(cross_call_lock); |
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/* Cross calls must be serialized, at least currently. */ |
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static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1, |
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unsigned long arg2, unsigned long arg3, |
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unsigned long arg4) |
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{ |
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if (smp_processors_ready) { |
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register int high = NR_CPUS - 1; |
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unsigned long flags; |
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spin_lock_irqsave(&cross_call_lock, flags); |
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{ |
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/* If you make changes here, make sure gcc generates proper code... */ |
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register smpfunc_t f asm("i0") = func; |
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register unsigned long a1 asm("i1") = arg1; |
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register unsigned long a2 asm("i2") = arg2; |
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register unsigned long a3 asm("i3") = arg3; |
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register unsigned long a4 asm("i4") = arg4; |
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register unsigned long a5 asm("i5") = 0; |
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__asm__ __volatile__("std %0, [%6]\n\t" |
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"std %2, [%6 + 8]\n\t" |
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"std %4, [%6 + 16]\n\t" : : |
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"r"(f), "r"(a1), "r"(a2), "r"(a3), |
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"r"(a4), "r"(a5), |
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"r"(&ccall_info.func)); |
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} |
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/* Init receive/complete mapping, plus fire the IPI's off. */ |
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{ |
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register int i; |
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cpumask_clear_cpu(smp_processor_id(), &mask); |
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cpumask_and(&mask, cpu_online_mask, &mask); |
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for (i = 0; i <= high; i++) { |
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if (cpumask_test_cpu(i, &mask)) { |
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ccall_info.processors_in[i] = 0; |
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ccall_info.processors_out[i] = 0; |
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leon_send_ipi(i, LEON3_IRQ_CROSS_CALL); |
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} |
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} |
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} |
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{ |
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register int i; |
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i = 0; |
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do { |
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if (!cpumask_test_cpu(i, &mask)) |
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continue; |
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while (!ccall_info.processors_in[i]) |
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barrier(); |
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} while (++i <= high); |
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i = 0; |
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do { |
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if (!cpumask_test_cpu(i, &mask)) |
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continue; |
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while (!ccall_info.processors_out[i]) |
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barrier(); |
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} while (++i <= high); |
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} |
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spin_unlock_irqrestore(&cross_call_lock, flags); |
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} |
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} |
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/* Running cross calls. */ |
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void leon_cross_call_irq(void) |
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{ |
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int i = smp_processor_id(); |
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ccall_info.processors_in[i] = 1; |
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ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, |
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ccall_info.arg4, ccall_info.arg5); |
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ccall_info.processors_out[i] = 1; |
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} |
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static const struct sparc32_ipi_ops leon_ipi_ops = { |
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.cross_call = leon_cross_call, |
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.resched = leon_ipi_resched, |
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.single = leon_ipi_single, |
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.mask_one = leon_ipi_mask_one, |
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}; |
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void __init leon_init_smp(void) |
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{ |
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/* Patch ipi15 trap table */ |
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t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m); |
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sparc32_ipi_ops = &leon_ipi_ops; |
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}
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