diff options
Diffstat (limited to 'arch/powerpc/kernel/irq.c')
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c new file mode 100644 index 000000000..e8a548447 --- /dev/null +++ b/arch/powerpc/kernel/irq.c @@ -0,0 +1,812 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Derived from arch/i386/kernel/irq.c + * Copyright (C) 1992 Linus Torvalds + * Adapted from arch/i386 by Gary Thomas + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * Updated and modified by Cort Dougan <cort@fsmlabs.com> + * Copyright (C) 1996-2001 Cort Dougan + * Adapted for Power Macintosh by Paul Mackerras + * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) + * + * This file contains the code used by various IRQ handling routines: + * asking for different IRQ's should be done through these routines + * instead of just grabbing them. Thus setups with different IRQ numbers + * shouldn't result in any weird surprises, and installing new handlers + * should be easier. + * + * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the + * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit + * mask register (of which only 16 are defined), hence the weird shifting + * and complement of the cached_irq_mask. I want to be able to stuff + * this right into the SIU SMASK register. + * Many of the prep/chrp functions are conditional compiled on CONFIG_PPC_8xx + * to reduce code space and undefined function references. + */ + +#undef DEBUG + +#include <linux/export.h> +#include <linux/threads.h> +#include <linux/kernel_stat.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/ptrace.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/timex.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/seq_file.h> +#include <linux/cpumask.h> +#include <linux/profile.h> +#include <linux/bitops.h> +#include <linux/list.h> +#include <linux/radix-tree.h> +#include <linux/mutex.h> +#include <linux/pci.h> +#include <linux/debugfs.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/vmalloc.h> +#include <linux/pgtable.h> + +#include <linux/uaccess.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/cache.h> +#include <asm/prom.h> +#include <asm/ptrace.h> +#include <asm/machdep.h> +#include <asm/udbg.h> +#include <asm/smp.h> +#include <asm/livepatch.h> +#include <asm/asm-prototypes.h> +#include <asm/hw_irq.h> + +#ifdef CONFIG_PPC64 +#include <asm/paca.h> +#include <asm/firmware.h> +#include <asm/lv1call.h> +#include <asm/dbell.h> +#endif +#define CREATE_TRACE_POINTS +#include <asm/trace.h> +#include <asm/cpu_has_feature.h> + +DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); +EXPORT_PER_CPU_SYMBOL(irq_stat); + +#ifdef CONFIG_PPC32 +atomic_t ppc_n_lost_interrupts; + +#ifdef CONFIG_TAU_INT +extern int tau_initialized; +u32 tau_interrupts(unsigned long cpu); +#endif +#endif /* CONFIG_PPC32 */ + +#ifdef CONFIG_PPC64 + +int distribute_irqs = 1; + +static inline notrace unsigned long get_irq_happened(void) +{ + unsigned long happened; + + __asm__ __volatile__("lbz %0,%1(13)" + : "=r" (happened) : "i" (offsetof(struct paca_struct, irq_happened))); + + return happened; +} + +#ifdef CONFIG_PPC_BOOK3E + +/* This is called whenever we are re-enabling interrupts + * and returns either 0 (nothing to do) or 500/900/280 if + * there's an EE, DEC or DBELL to generate. + * + * This is called in two contexts: From arch_local_irq_restore() + * before soft-enabling interrupts, and from the exception exit + * path when returning from an interrupt from a soft-disabled to + * a soft enabled context. In both case we have interrupts hard + * disabled. + * + * We take care of only clearing the bits we handled in the + * PACA irq_happened field since we can only re-emit one at a + * time and we don't want to "lose" one. + */ +notrace unsigned int __check_irq_replay(void) +{ + /* + * We use local_paca rather than get_paca() to avoid all + * the debug_smp_processor_id() business in this low level + * function + */ + unsigned char happened = local_paca->irq_happened; + + /* + * We are responding to the next interrupt, so interrupt-off + * latencies should be reset here. + */ + trace_hardirqs_on(); + trace_hardirqs_off(); + + if (happened & PACA_IRQ_DEC) { + local_paca->irq_happened &= ~PACA_IRQ_DEC; + return 0x900; + } + + if (happened & PACA_IRQ_EE) { + local_paca->irq_happened &= ~PACA_IRQ_EE; + return 0x500; + } + + if (happened & PACA_IRQ_DBELL) { + local_paca->irq_happened &= ~PACA_IRQ_DBELL; + return 0x280; + } + + if (happened & PACA_IRQ_HARD_DIS) + local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; + + /* There should be nothing left ! */ + BUG_ON(local_paca->irq_happened != 0); + + return 0; +} + +/* + * This is specifically called by assembly code to re-enable interrupts + * if they are currently disabled. This is typically called before + * schedule() or do_signal() when returning to userspace. We do it + * in C to avoid the burden of dealing with lockdep etc... + * + * NOTE: This is called with interrupts hard disabled but not marked + * as such in paca->irq_happened, so we need to resync this. + */ +void notrace restore_interrupts(void) +{ + if (irqs_disabled()) { + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + local_irq_enable(); + } else + __hard_irq_enable(); +} + +#endif /* CONFIG_PPC_BOOK3E */ + +void replay_soft_interrupts(void) +{ + struct pt_regs regs; + + /* + * Be careful here, calling these interrupt handlers can cause + * softirqs to be raised, which they may run when calling irq_exit, + * which will cause local_irq_enable() to be run, which can then + * recurse into this function. Don't keep any state across + * interrupt handler calls which may change underneath us. + * + * We use local_paca rather than get_paca() to avoid all the + * debug_smp_processor_id() business in this low level function. + */ + + ppc_save_regs(®s); + regs.softe = IRQS_ENABLED; + +again: + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) + WARN_ON_ONCE(mfmsr() & MSR_EE); + + /* + * Force the delivery of pending soft-disabled interrupts on PS3. + * Any HV call will have this side effect. + */ + if (firmware_has_feature(FW_FEATURE_PS3_LV1)) { + u64 tmp, tmp2; + lv1_get_version_info(&tmp, &tmp2); + } + + /* + * Check if an hypervisor Maintenance interrupt happened. + * This is a higher priority interrupt than the others, so + * replay it first. + */ + if (IS_ENABLED(CONFIG_PPC_BOOK3S) && (local_paca->irq_happened & PACA_IRQ_HMI)) { + local_paca->irq_happened &= ~PACA_IRQ_HMI; + regs.trap = 0xe60; + handle_hmi_exception(®s); + if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)) + hard_irq_disable(); + } + + if (local_paca->irq_happened & PACA_IRQ_DEC) { + local_paca->irq_happened &= ~PACA_IRQ_DEC; + regs.trap = 0x900; + timer_interrupt(®s); + if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)) + hard_irq_disable(); + } + + if (local_paca->irq_happened & PACA_IRQ_EE) { + local_paca->irq_happened &= ~PACA_IRQ_EE; + regs.trap = 0x500; + do_IRQ(®s); + if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)) + hard_irq_disable(); + } + + if (IS_ENABLED(CONFIG_PPC_DOORBELL) && (local_paca->irq_happened & PACA_IRQ_DBELL)) { + local_paca->irq_happened &= ~PACA_IRQ_DBELL; + if (IS_ENABLED(CONFIG_PPC_BOOK3E)) + regs.trap = 0x280; + else + regs.trap = 0xa00; + doorbell_exception(®s); + if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)) + hard_irq_disable(); + } + + /* Book3E does not support soft-masking PMI interrupts */ + if (IS_ENABLED(CONFIG_PPC_BOOK3S) && (local_paca->irq_happened & PACA_IRQ_PMI)) { + local_paca->irq_happened &= ~PACA_IRQ_PMI; + regs.trap = 0xf00; + performance_monitor_exception(®s); + if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)) + hard_irq_disable(); + } + + if (local_paca->irq_happened & ~PACA_IRQ_HARD_DIS) { + /* + * We are responding to the next interrupt, so interrupt-off + * latencies should be reset here. + */ + trace_hardirqs_on(); + trace_hardirqs_off(); + goto again; + } +} + +#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_KUAP) +static inline void replay_soft_interrupts_irqrestore(void) +{ + unsigned long kuap_state = get_kuap(); + + /* + * Check if anything calls local_irq_enable/restore() when KUAP is + * disabled (user access enabled). We handle that case here by saving + * and re-locking AMR but we shouldn't get here in the first place, + * hence the warning. + */ + kuap_check_amr(); + + if (kuap_state != AMR_KUAP_BLOCKED) + set_kuap(AMR_KUAP_BLOCKED); + + replay_soft_interrupts(); + + if (kuap_state != AMR_KUAP_BLOCKED) + set_kuap(kuap_state); +} +#else +#define replay_soft_interrupts_irqrestore() replay_soft_interrupts() +#endif + +notrace void arch_local_irq_restore(unsigned long mask) +{ + unsigned char irq_happened; + + /* Write the new soft-enabled value */ + irq_soft_mask_set(mask); + if (mask) + return; + + /* + * From this point onward, we can take interrupts, preempt, + * etc... unless we got hard-disabled. We check if an event + * happened. If none happened, we know we can just return. + * + * We may have preempted before the check below, in which case + * we are checking the "new" CPU instead of the old one. This + * is only a problem if an event happened on the "old" CPU. + * + * External interrupt events will have caused interrupts to + * be hard-disabled, so there is no problem, we + * cannot have preempted. + */ + irq_happened = get_irq_happened(); + if (!irq_happened) { + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) + WARN_ON_ONCE(!(mfmsr() & MSR_EE)); + return; + } + + /* We need to hard disable to replay. */ + if (!(irq_happened & PACA_IRQ_HARD_DIS)) { + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) + WARN_ON_ONCE(!(mfmsr() & MSR_EE)); + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + } else { + /* + * We should already be hard disabled here. We had bugs + * where that wasn't the case so let's dbl check it and + * warn if we are wrong. Only do that when IRQ tracing + * is enabled as mfmsr() can be costly. + */ + if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) { + if (WARN_ON_ONCE(mfmsr() & MSR_EE)) + __hard_irq_disable(); + } + + if (irq_happened == PACA_IRQ_HARD_DIS) { + local_paca->irq_happened = 0; + __hard_irq_enable(); + return; + } + } + + /* + * Disable preempt here, so that the below preempt_enable will + * perform resched if required (a replayed interrupt may set + * need_resched). + */ + preempt_disable(); + irq_soft_mask_set(IRQS_ALL_DISABLED); + trace_hardirqs_off(); + + replay_soft_interrupts_irqrestore(); + local_paca->irq_happened = 0; + + trace_hardirqs_on(); + irq_soft_mask_set(IRQS_ENABLED); + __hard_irq_enable(); + preempt_enable(); +} +EXPORT_SYMBOL(arch_local_irq_restore); + +/* + * This is a helper to use when about to go into idle low-power + * when the latter has the side effect of re-enabling interrupts + * (such as calling H_CEDE under pHyp). + * + * You call this function with interrupts soft-disabled (this is + * already the case when ppc_md.power_save is called). The function + * will return whether to enter power save or just return. + * + * In the former case, it will have notified lockdep of interrupts + * being re-enabled and generally sanitized the lazy irq state, + * and in the latter case it will leave with interrupts hard + * disabled and marked as such, so the local_irq_enable() call + * in arch_cpu_idle() will properly re-enable everything. + */ +bool prep_irq_for_idle(void) +{ + /* + * First we need to hard disable to ensure no interrupt + * occurs before we effectively enter the low power state + */ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + + /* + * If anything happened while we were soft-disabled, + * we return now and do not enter the low power state. + */ + if (lazy_irq_pending()) + return false; + + /* Tell lockdep we are about to re-enable */ + trace_hardirqs_on(); + + /* + * Mark interrupts as soft-enabled and clear the + * PACA_IRQ_HARD_DIS from the pending mask since we + * are about to hard enable as well as a side effect + * of entering the low power state. + */ + local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; + irq_soft_mask_set(IRQS_ENABLED); + + /* Tell the caller to enter the low power state */ + return true; +} + +#ifdef CONFIG_PPC_BOOK3S +/* + * This is for idle sequences that return with IRQs off, but the + * idle state itself wakes on interrupt. Tell the irq tracer that + * IRQs are enabled for the duration of idle so it does not get long + * off times. Must be paired with fini_irq_for_idle_irqsoff. + */ +bool prep_irq_for_idle_irqsoff(void) +{ + WARN_ON(!irqs_disabled()); + + /* + * First we need to hard disable to ensure no interrupt + * occurs before we effectively enter the low power state + */ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + + /* + * If anything happened while we were soft-disabled, + * we return now and do not enter the low power state. + */ + if (lazy_irq_pending()) + return false; + + /* Tell lockdep we are about to re-enable */ + trace_hardirqs_on(); + + return true; +} + +/* + * Take the SRR1 wakeup reason, index into this table to find the + * appropriate irq_happened bit. + * + * Sytem reset exceptions taken in idle state also come through here, + * but they are NMI interrupts so do not need to wait for IRQs to be + * restored, and should be taken as early as practical. These are marked + * with 0xff in the table. The Power ISA specifies 0100b as the system + * reset interrupt reason. + */ +#define IRQ_SYSTEM_RESET 0xff + +static const u8 srr1_to_lazyirq[0x10] = { + 0, 0, 0, + PACA_IRQ_DBELL, + IRQ_SYSTEM_RESET, + PACA_IRQ_DBELL, + PACA_IRQ_DEC, + 0, + PACA_IRQ_EE, + PACA_IRQ_EE, + PACA_IRQ_HMI, + 0, 0, 0, 0, 0 }; + +void replay_system_reset(void) +{ + struct pt_regs regs; + + ppc_save_regs(®s); + regs.trap = 0x100; + get_paca()->in_nmi = 1; + system_reset_exception(®s); + get_paca()->in_nmi = 0; +} +EXPORT_SYMBOL_GPL(replay_system_reset); + +void irq_set_pending_from_srr1(unsigned long srr1) +{ + unsigned int idx = (srr1 & SRR1_WAKEMASK_P8) >> 18; + u8 reason = srr1_to_lazyirq[idx]; + + /* + * Take the system reset now, which is immediately after registers + * are restored from idle. It's an NMI, so interrupts need not be + * re-enabled before it is taken. + */ + if (unlikely(reason == IRQ_SYSTEM_RESET)) { + replay_system_reset(); + return; + } + + if (reason == PACA_IRQ_DBELL) { + /* + * When doorbell triggers a system reset wakeup, the message + * is not cleared, so if the doorbell interrupt is replayed + * and the IPI handled, the doorbell interrupt would still + * fire when EE is enabled. + * + * To avoid taking the superfluous doorbell interrupt, + * execute a msgclr here before the interrupt is replayed. + */ + ppc_msgclr(PPC_DBELL_MSGTYPE); + } + + /* + * The 0 index (SRR1[42:45]=b0000) must always evaluate to 0, + * so this can be called unconditionally with the SRR1 wake + * reason as returned by the idle code, which uses 0 to mean no + * interrupt. + * + * If a future CPU was to designate this as an interrupt reason, + * then a new index for no interrupt must be assigned. + */ + local_paca->irq_happened |= reason; +} +#endif /* CONFIG_PPC_BOOK3S */ + +/* + * Force a replay of the external interrupt handler on this CPU. + */ +void force_external_irq_replay(void) +{ + /* + * This must only be called with interrupts soft-disabled, + * the replay will happen when re-enabling. + */ + WARN_ON(!arch_irqs_disabled()); + + /* + * Interrupts must always be hard disabled before irq_happened is + * modified (to prevent lost update in case of interrupt between + * load and store). + */ + __hard_irq_disable(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + + /* Indicate in the PACA that we have an interrupt to replay */ + local_paca->irq_happened |= PACA_IRQ_EE; +} + +#endif /* CONFIG_PPC64 */ + +int arch_show_interrupts(struct seq_file *p, int prec) +{ + int j; + +#if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT) + if (tau_initialized) { + seq_printf(p, "%*s: ", prec, "TAU"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", tau_interrupts(j)); + seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n"); + } +#endif /* CONFIG_PPC32 && CONFIG_TAU_INT */ + + seq_printf(p, "%*s: ", prec, "LOC"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs_event); + seq_printf(p, " Local timer interrupts for timer event device\n"); + + seq_printf(p, "%*s: ", prec, "BCT"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).broadcast_irqs_event); + seq_printf(p, " Broadcast timer interrupts for timer event device\n"); + + seq_printf(p, "%*s: ", prec, "LOC"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs_others); + seq_printf(p, " Local timer interrupts for others\n"); + + seq_printf(p, "%*s: ", prec, "SPU"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs); + seq_printf(p, " Spurious interrupts\n"); + + seq_printf(p, "%*s: ", prec, "PMI"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs); + seq_printf(p, " Performance monitoring interrupts\n"); + + seq_printf(p, "%*s: ", prec, "MCE"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions); + seq_printf(p, " Machine check exceptions\n"); + +#ifdef CONFIG_PPC_BOOK3S_64 + if (cpu_has_feature(CPU_FTR_HVMODE)) { + seq_printf(p, "%*s: ", prec, "HMI"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", paca_ptrs[j]->hmi_irqs); + seq_printf(p, " Hypervisor Maintenance Interrupts\n"); + } +#endif + + seq_printf(p, "%*s: ", prec, "NMI"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).sreset_irqs); + seq_printf(p, " System Reset interrupts\n"); + +#ifdef CONFIG_PPC_WATCHDOG + seq_printf(p, "%*s: ", prec, "WDG"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).soft_nmi_irqs); + seq_printf(p, " Watchdog soft-NMI interrupts\n"); +#endif + +#ifdef CONFIG_PPC_DOORBELL + if (cpu_has_feature(CPU_FTR_DBELL)) { + seq_printf(p, "%*s: ", prec, "DBL"); + for_each_online_cpu(j) + seq_printf(p, "%10u ", per_cpu(irq_stat, j).doorbell_irqs); + seq_printf(p, " Doorbell interrupts\n"); + } +#endif + + return 0; +} + +/* + * /proc/stat helpers + */ +u64 arch_irq_stat_cpu(unsigned int cpu) +{ + u64 sum = per_cpu(irq_stat, cpu).timer_irqs_event; + + sum += per_cpu(irq_stat, cpu).broadcast_irqs_event; + sum += per_cpu(irq_stat, cpu).pmu_irqs; + sum += per_cpu(irq_stat, cpu).mce_exceptions; + sum += per_cpu(irq_stat, cpu).spurious_irqs; + sum += per_cpu(irq_stat, cpu).timer_irqs_others; +#ifdef CONFIG_PPC_BOOK3S_64 + sum += paca_ptrs[cpu]->hmi_irqs; +#endif + sum += per_cpu(irq_stat, cpu).sreset_irqs; +#ifdef CONFIG_PPC_WATCHDOG + sum += per_cpu(irq_stat, cpu).soft_nmi_irqs; +#endif +#ifdef CONFIG_PPC_DOORBELL + sum += per_cpu(irq_stat, cpu).doorbell_irqs; +#endif + + return sum; +} + +static inline void check_stack_overflow(void) +{ + long sp; + + if (!IS_ENABLED(CONFIG_DEBUG_STACKOVERFLOW)) + return; + + sp = current_stack_pointer & (THREAD_SIZE - 1); + + /* check for stack overflow: is there less than 2KB free? */ + if (unlikely(sp < 2048)) { + pr_err("do_IRQ: stack overflow: %ld\n", sp); + dump_stack(); + } +} + +void __do_irq(struct pt_regs *regs) +{ + unsigned int irq; + + irq_enter(); + + trace_irq_entry(regs); + + /* + * Query the platform PIC for the interrupt & ack it. + * + * This will typically lower the interrupt line to the CPU + */ + irq = ppc_md.get_irq(); + + /* We can hard enable interrupts now to allow perf interrupts */ + may_hard_irq_enable(); + + /* And finally process it */ + if (unlikely(!irq)) + __this_cpu_inc(irq_stat.spurious_irqs); + else + generic_handle_irq(irq); + + trace_irq_exit(regs); + + irq_exit(); +} + +void do_IRQ(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + void *cursp, *irqsp, *sirqsp; + + /* Switch to the irq stack to handle this */ + cursp = (void *)(current_stack_pointer & ~(THREAD_SIZE - 1)); + irqsp = hardirq_ctx[raw_smp_processor_id()]; + sirqsp = softirq_ctx[raw_smp_processor_id()]; + + check_stack_overflow(); + + /* Already there ? */ + if (unlikely(cursp == irqsp || cursp == sirqsp)) { + __do_irq(regs); + set_irq_regs(old_regs); + return; + } + /* Switch stack and call */ + call_do_irq(regs, irqsp); + + set_irq_regs(old_regs); +} + +static void *__init alloc_vm_stack(void) +{ + return __vmalloc_node(THREAD_SIZE, THREAD_ALIGN, THREADINFO_GFP, + NUMA_NO_NODE, (void *)_RET_IP_); +} + +static void __init vmap_irqstack_init(void) +{ + int i; + + for_each_possible_cpu(i) { + softirq_ctx[i] = alloc_vm_stack(); + hardirq_ctx[i] = alloc_vm_stack(); + } +} + + +void __init init_IRQ(void) +{ + if (IS_ENABLED(CONFIG_VMAP_STACK)) + vmap_irqstack_init(); + + if (ppc_md.init_IRQ) + ppc_md.init_IRQ(); +} + +#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) +void *critirq_ctx[NR_CPUS] __read_mostly; +void *dbgirq_ctx[NR_CPUS] __read_mostly; +void *mcheckirq_ctx[NR_CPUS] __read_mostly; +#endif + +void *softirq_ctx[NR_CPUS] __read_mostly; +void *hardirq_ctx[NR_CPUS] __read_mostly; + +void do_softirq_own_stack(void) +{ + call_do_softirq(softirq_ctx[smp_processor_id()]); +} + +irq_hw_number_t virq_to_hw(unsigned int virq) +{ + struct irq_data *irq_data = irq_get_irq_data(virq); + return WARN_ON(!irq_data) ? 0 : irq_data->hwirq; +} +EXPORT_SYMBOL_GPL(virq_to_hw); + +#ifdef CONFIG_SMP +int irq_choose_cpu(const struct cpumask *mask) +{ + int cpuid; + + if (cpumask_equal(mask, cpu_online_mask)) { + static int irq_rover; + static DEFINE_RAW_SPINLOCK(irq_rover_lock); + unsigned long flags; + + /* Round-robin distribution... */ +do_round_robin: + raw_spin_lock_irqsave(&irq_rover_lock, flags); + + irq_rover = cpumask_next(irq_rover, cpu_online_mask); + if (irq_rover >= nr_cpu_ids) + irq_rover = cpumask_first(cpu_online_mask); + + cpuid = irq_rover; + + raw_spin_unlock_irqrestore(&irq_rover_lock, flags); + } else { + cpuid = cpumask_first_and(mask, cpu_online_mask); + if (cpuid >= nr_cpu_ids) + goto do_round_robin; + } + + return get_hard_smp_processor_id(cpuid); +} +#else +int irq_choose_cpu(const struct cpumask *mask) +{ + return hard_smp_processor_id(); +} +#endif + +#ifdef CONFIG_PPC64 +static int __init setup_noirqdistrib(char *str) +{ + distribute_irqs = 0; + return 1; +} + +__setup("noirqdistrib", setup_noirqdistrib); +#endif /* CONFIG_PPC64 */ |