/* * 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 * Copyright (C) 1996-2001 Cort Dougan * Adapted for Power Macintosh by Paul Mackerras * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) * * 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; either version * 2 of the License, or (at your option) any later version. * * 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_8xx * to reduce code space and undefined function references. */ #undef DEBUG #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_PPC64 #include #include #include #endif #define CREATE_TRACE_POINTS #include DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); EXPORT_PER_CPU_SYMBOL(irq_stat); int __irq_offset_value; #ifdef CONFIG_PPC32 EXPORT_SYMBOL(__irq_offset_value); atomic_t ppc_n_lost_interrupts; #ifdef CONFIG_TAU_INT extern int tau_initialized; extern int tau_interrupts(int); #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; } static inline notrace void set_soft_enabled(unsigned long enable) { __asm__ __volatile__("stb %0,%1(13)" : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled))); } static inline notrace int decrementer_check_overflow(void) { u64 now = get_tb_or_rtc(); u64 *next_tb = &__get_cpu_var(decrementers_next_tb); if (now >= *next_tb) set_dec(1); return now >= *next_tb; } /* This is called whenever we are re-enabling interrupts * and returns either 0 (nothing to do) or 500/900 if there's * either an EE or a DEC 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; /* Clear bit 0 which we wouldn't clear otherwise */ local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; /* * 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); } /* * We may have missed a decrementer interrupt. We check the * decrementer itself rather than the paca irq_happened field * in case we also had a rollover while hard disabled */ local_paca->irq_happened &= ~PACA_IRQ_DEC; if (decrementer_check_overflow()) return 0x900; /* Finally check if an external interrupt happened */ local_paca->irq_happened &= ~PACA_IRQ_EE; if (happened & PACA_IRQ_EE) return 0x500; #ifdef CONFIG_PPC_BOOK3E /* Finally check if an EPR external interrupt happened * this bit is typically set if we need to handle another * "edge" interrupt from within the MPIC "EPR" handler */ local_paca->irq_happened &= ~PACA_IRQ_EE_EDGE; if (happened & PACA_IRQ_EE_EDGE) return 0x500; local_paca->irq_happened &= ~PACA_IRQ_DBELL; if (happened & PACA_IRQ_DBELL) return 0x280; #endif /* CONFIG_PPC_BOOK3E */ /* There should be nothing left ! */ BUG_ON(local_paca->irq_happened != 0); return 0; } notrace void arch_local_irq_restore(unsigned long en) { unsigned char irq_happened; unsigned int replay; /* Write the new soft-enabled value */ set_soft_enabled(en); if (!en) 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 on non-iseries 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) return; /* * We need to hard disable to get a trusted value from * __check_irq_replay(). We also need to soft-disable * again to avoid warnings in there due to the use of * per-cpu variables. * * We know that if the value in irq_happened is exactly 0x01 * then we are already hard disabled (there are other less * common cases that we'll ignore for now), so we skip the * (expensive) mtmsrd. */ if (unlikely(irq_happened != PACA_IRQ_HARD_DIS)) __hard_irq_disable(); set_soft_enabled(0); /* * Check if anything needs to be re-emitted. We haven't * soft-enabled yet to avoid warnings in decrementer_check_overflow * accessing per-cpu variables */ replay = __check_irq_replay(); /* We can soft-enable now */ set_soft_enabled(1); /* * And replay if we have to. This will return with interrupts * hard-enabled. */ if (replay) { __replay_interrupt(replay); return; } /* Finally, let's ensure we are hard enabled */ __hard_irq_enable(); } EXPORT_SYMBOL(arch_local_irq_restore); /* * 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... */ void restore_interrupts(void) { if (irqs_disabled()) local_irq_enable(); } #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); seq_printf(p, " Local timer interrupts\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, "CNT"); 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"); return 0; } /* * /proc/stat helpers */ u64 arch_irq_stat_cpu(unsigned int cpu) { u64 sum = per_cpu(irq_stat, cpu).timer_irqs; sum += per_cpu(irq_stat, cpu).pmu_irqs; sum += per_cpu(irq_stat, cpu).mce_exceptions; sum += per_cpu(irq_stat, cpu).spurious_irqs; return sum; } #ifdef CONFIG_HOTPLUG_CPU void migrate_irqs(void) { struct irq_desc *desc; unsigned int irq; static int warned; cpumask_var_t mask; const struct cpumask *map = cpu_online_mask; alloc_cpumask_var(&mask, GFP_KERNEL); for_each_irq(irq) { struct irq_data *data; struct irq_chip *chip; desc = irq_to_desc(irq); if (!desc) continue; data = irq_desc_get_irq_data(desc); if (irqd_is_per_cpu(data)) continue; chip = irq_data_get_irq_chip(data); cpumask_and(mask, data->affinity, map); if (cpumask_any(mask) >= nr_cpu_ids) { printk("Breaking affinity for irq %i\n", irq); cpumask_copy(mask, map); } if (chip->irq_set_affinity) chip->irq_set_affinity(data, mask, true); else if (desc->action && !(warned++)) printk("Cannot set affinity for irq %i\n", irq); } free_cpumask_var(mask); local_irq_enable(); mdelay(1); local_irq_disable(); } #endif static inline void handle_one_irq(unsigned int irq) { struct thread_info *curtp, *irqtp; unsigned long saved_sp_limit; struct irq_desc *desc; desc = irq_to_desc(irq); if (!desc) return; /* Switch to the irq stack to handle this */ curtp = current_thread_info(); irqtp = hardirq_ctx[smp_processor_id()]; if (curtp == irqtp) { /* We're already on the irq stack, just handle it */ desc->handle_irq(irq, desc); return; } saved_sp_limit = current->thread.ksp_limit; irqtp->task = curtp->task; irqtp->flags = 0; /* Copy the softirq bits in preempt_count so that the * softirq checks work in the hardirq context. */ irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) | (curtp->preempt_count & SOFTIRQ_MASK); current->thread.ksp_limit = (unsigned long)irqtp + _ALIGN_UP(sizeof(struct thread_info), 16); call_handle_irq(irq, desc, irqtp, desc->handle_irq); current->thread.ksp_limit = saved_sp_limit; irqtp->task = NULL; /* Set any flag that may have been set on the * alternate stack */ if (irqtp->flags) set_bits(irqtp->flags, &curtp->flags); } static inline void check_stack_overflow(void) { #ifdef CONFIG_DEBUG_STACKOVERFLOW long sp; sp = __get_SP() & (THREAD_SIZE-1); /* check for stack overflow: is there less than 2KB free? */ if (unlikely(sp < (sizeof(struct thread_info) + 2048))) { printk("do_IRQ: stack overflow: %ld\n", sp - sizeof(struct thread_info)); dump_stack(); } #endif } void do_IRQ(struct pt_regs *regs) { struct pt_regs *old_regs = set_irq_regs(regs); unsigned int irq; trace_irq_entry(regs); irq_enter(); check_stack_overflow(); /* * 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 */ may_hard_irq_enable(); /* And finally process it */ if (irq != NO_IRQ && irq != NO_IRQ_IGNORE) handle_one_irq(irq); else if (irq != NO_IRQ_IGNORE) __get_cpu_var(irq_stat).spurious_irqs++; irq_exit(); set_irq_regs(old_regs); trace_irq_exit(regs); } void __init init_IRQ(void) { if (ppc_md.init_IRQ) ppc_md.init_IRQ(); exc_lvl_ctx_init(); irq_ctx_init(); } #if defined(CONFIG_BOOKE) || defined(CONFIG_40x) struct thread_info *critirq_ctx[NR_CPUS] __read_mostly; struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly; struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly; void exc_lvl_ctx_init(void) { struct thread_info *tp; int i, cpu_nr; for_each_possible_cpu(i) { #ifdef CONFIG_PPC64 cpu_nr = i; #else cpu_nr = get_hard_smp_processor_id(i); #endif memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE); tp = critirq_ctx[cpu_nr]; tp->cpu = cpu_nr; tp->preempt_count = 0; #ifdef CONFIG_BOOKE memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE); tp = dbgirq_ctx[cpu_nr]; tp->cpu = cpu_nr; tp->preempt_count = 0; memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE); tp = mcheckirq_ctx[cpu_nr]; tp->cpu = cpu_nr; tp->preempt_count = HARDIRQ_OFFSET; #endif } } #endif struct thread_info *softirq_ctx[NR_CPUS] __read_mostly; struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly; void irq_ctx_init(void) { struct thread_info *tp; int i; for_each_possible_cpu(i) { memset((void *)softirq_ctx[i], 0, THREAD_SIZE); tp = softirq_ctx[i]; tp->cpu = i; tp->preempt_count = 0; memset((void *)hardirq_ctx[i], 0, THREAD_SIZE); tp = hardirq_ctx[i]; tp->cpu = i; tp->preempt_count = HARDIRQ_OFFSET; } } static inline void do_softirq_onstack(void) { struct thread_info *curtp, *irqtp; unsigned long saved_sp_limit = current->thread.ksp_limit; curtp = current_thread_info(); irqtp = softirq_ctx[smp_processor_id()]; irqtp->task = curtp->task; irqtp->flags = 0; current->thread.ksp_limit = (unsigned long)irqtp + _ALIGN_UP(sizeof(struct thread_info), 16); call_do_softirq(irqtp); current->thread.ksp_limit = saved_sp_limit; irqtp->task = NULL; /* Set any flag that may have been set on the * alternate stack */ if (irqtp->flags) set_bits(irqtp->flags, &curtp->flags); } void do_softirq(void) { unsigned long flags; if (in_interrupt()) return; local_irq_save(flags); if (local_softirq_pending()) do_softirq_onstack(); local_irq_restore(flags); } /* * IRQ controller and virtual interrupts */ /* The main irq map itself is an array of NR_IRQ entries containing the * associate host and irq number. An entry with a host of NULL is free. * An entry can be allocated if it's free, the allocator always then sets * hwirq first to the host's invalid irq number and then fills ops. */ struct irq_map_entry { irq_hw_number_t hwirq; struct irq_host *host; }; static LIST_HEAD(irq_hosts); static DEFINE_RAW_SPINLOCK(irq_big_lock); static DEFINE_MUTEX(revmap_trees_mutex); static struct irq_map_entry irq_map[NR_IRQS]; static unsigned int irq_virq_count = NR_IRQS; static struct irq_host *irq_default_host; irq_hw_number_t irqd_to_hwirq(struct irq_data *d) { return irq_map[d->irq].hwirq; } EXPORT_SYMBOL_GPL(irqd_to_hwirq); irq_hw_number_t virq_to_hw(unsigned int virq) { return irq_map[virq].hwirq; } EXPORT_SYMBOL_GPL(virq_to_hw); bool virq_is_host(unsigned int virq, struct irq_host *host) { return irq_map[virq].host == host; } EXPORT_SYMBOL_GPL(virq_is_host); static int default_irq_host_match(struct irq_host *h, struct device_node *np) { return h->of_node != NULL && h->of_node == np; } struct irq_host *irq_alloc_host(struct device_node *of_node, unsigned int revmap_type, unsigned int revmap_arg, struct irq_host_ops *ops, irq_hw_number_t inval_irq) { struct irq_host *host; unsigned int size = sizeof(struct irq_host); unsigned int i; unsigned int *rmap; unsigned long flags; /* Allocate structure and revmap table if using linear mapping */ if (revmap_type == IRQ_HOST_MAP_LINEAR) size += revmap_arg * sizeof(unsigned int); host = kzalloc(size, GFP_KERNEL); if (host == NULL) return NULL; /* Fill structure */ host->revmap_type = revmap_type; host->inval_irq = inval_irq; host->ops = ops; host->of_node = of_node_get(of_node); if (host->ops->match == NULL) host->ops->match = default_irq_host_match; raw_spin_lock_irqsave(&irq_big_lock, flags); /* If it's a legacy controller, check for duplicates and * mark it as allocated (we use irq 0 host pointer for that */ if (revmap_type == IRQ_HOST_MAP_LEGACY) { if (irq_map[0].host != NULL) { raw_spin_unlock_irqrestore(&irq_big_lock, flags); of_node_put(host->of_node); kfree(host); return NULL; } irq_map[0].host = host; } list_add(&host->link, &irq_hosts); raw_spin_unlock_irqrestore(&irq_big_lock, flags); /* Additional setups per revmap type */ switch(revmap_type) { case IRQ_HOST_MAP_LEGACY: /* 0 is always the invalid number for legacy */ host->inval_irq = 0; /* setup us as the host for all legacy interrupts */ for (i = 1; i < NUM_ISA_INTERRUPTS; i++) { irq_map[i].hwirq = i; smp_wmb(); irq_map[i].host = host; smp_wmb(); /* Legacy flags are left to default at this point, * one can then use irq_create_mapping() to * explicitly change them */ ops->map(host, i, i); /* Clear norequest flags */ irq_clear_status_flags(i, IRQ_NOREQUEST); } break; case IRQ_HOST_MAP_LINEAR: rmap = (unsigned int *)(host + 1); for (i = 0; i < revmap_arg; i++) rmap[i] = NO_IRQ; host->revmap_data.linear.size = revmap_arg; smp_wmb(); host->revmap_data.linear.revmap = rmap; break; case IRQ_HOST_MAP_TREE: INIT_RADIX_TREE(&host->revmap_data.tree, GFP_KERNEL); break; default: break; } pr_debug("irq: Allocated host of type %d @0x%p\n", revmap_type, host); return host; } struct irq_host *irq_find_host(struct device_node *node) { struct irq_host *h, *found = NULL; unsigned long flags; /* We might want to match the legacy controller last since * it might potentially be set to match all interrupts in * the absence of a device node. This isn't a problem so far * yet though... */ raw_spin_lock_irqsave(&irq_big_lock, flags); list_for_each_entry(h, &irq_hosts, link) if (h->ops->match(h, node)) { found = h; break; } raw_spin_unlock_irqrestore(&irq_big_lock, flags); return found; } EXPORT_SYMBOL_GPL(irq_find_host); void irq_set_default_host(struct irq_host *host) { pr_debug("irq: Default host set to @0x%p\n", host); irq_default_host = host; } void irq_set_virq_count(unsigned int count) { pr_debug("irq: Trying to set virq count to %d\n", count); BUG_ON(count < NUM_ISA_INTERRUPTS); if (count < NR_IRQS) irq_virq_count = count; } static int irq_setup_virq(struct irq_host *host, unsigned int virq, irq_hw_number_t hwirq) { int res; res = irq_alloc_desc_at(virq, 0); if (res != virq) { pr_debug("irq: -> allocating desc failed\n"); goto error; } /* map it */ smp_wmb(); irq_map[virq].hwirq = hwirq; smp_mb(); if (host->ops->map(host, virq, hwirq)) { pr_debug("irq: -> mapping failed, freeing\n"); goto errdesc; } irq_clear_status_flags(virq, IRQ_NOREQUEST); return 0; errdesc: irq_free_descs(virq, 1); error: irq_free_virt(virq, 1); return -1; } unsigned int irq_create_direct_mapping(struct irq_host *host) { unsigned int virq; if (host == NULL) host = irq_default_host; BUG_ON(host == NULL); WARN_ON(host->revmap_type != IRQ_HOST_MAP_NOMAP); virq = irq_alloc_virt(host, 1, 0); if (virq == NO_IRQ) { pr_debug("irq: create_direct virq allocation failed\n"); return NO_IRQ; } pr_debug("irq: create_direct obtained virq %d\n", virq); if (irq_setup_virq(host, virq, virq)) return NO_IRQ; return virq; } unsigned int irq_create_mapping(struct irq_host *host, irq_hw_number_t hwirq) { unsigned int virq, hint; pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", host, hwirq); /* Look for default host if nececssary */ if (host == NULL) host = irq_default_host; if (host == NULL) { printk(KERN_WARNING "irq_create_mapping called for" " NULL host, hwirq=%lx\n", hwirq); WARN_ON(1); return NO_IRQ; } pr_debug("irq: -> using host @%p\n", host); /* Check if mapping already exists */ virq = irq_find_mapping(host, hwirq); if (virq != NO_IRQ) { pr_debug("irq: -> existing mapping on virq %d\n", virq); return virq; } /* Get a virtual interrupt number */ if (host->revmap_type == IRQ_HOST_MAP_LEGACY) { /* Handle legacy */ virq = (unsigned int)hwirq; if (virq == 0 || virq >= NUM_ISA_INTERRUPTS) return NO_IRQ; return virq; } else { /* Allocate a virtual interrupt number */ hint = hwirq % irq_virq_count; virq = irq_alloc_virt(host, 1, hint); if (virq == NO_IRQ) { pr_debug("irq: -> virq allocation failed\n"); return NO_IRQ; } } if (irq_setup_virq(host, virq, hwirq)) return NO_IRQ; pr_debug("irq: irq %lu on host %s mapped to virtual irq %u\n", hwirq, host->of_node ? host->of_node->full_name : "null", virq); return virq; } EXPORT_SYMBOL_GPL(irq_create_mapping); unsigned int irq_create_of_mapping(struct device_node *controller, const u32 *intspec, unsigned int intsize) { struct irq_host *host; irq_hw_number_t hwirq; unsigned int type = IRQ_TYPE_NONE; unsigned int virq; if (controller == NULL) host = irq_default_host; else host = irq_find_host(controller); if (host == NULL) { printk(KERN_WARNING "irq: no irq host found for %s !\n", controller->full_name); return NO_IRQ; } /* If host has no translation, then we assume interrupt line */ if (host->ops->xlate == NULL) hwirq = intspec[0]; else { if (host->ops->xlate(host, controller, intspec, intsize, &hwirq, &type)) return NO_IRQ; } /* Create mapping */ virq = irq_create_mapping(host, hwirq); if (virq == NO_IRQ) return virq; /* Set type if specified and different than the current one */ if (type != IRQ_TYPE_NONE && type != (irqd_get_trigger_type(irq_get_irq_data(virq)))) irq_set_irq_type(virq, type); return virq; } EXPORT_SYMBOL_GPL(irq_create_of_mapping); void irq_dispose_mapping(unsigned int virq) { struct irq_host *host; irq_hw_number_t hwirq; if (virq == NO_IRQ) return; host = irq_map[virq].host; if (WARN_ON(host == NULL)) return; /* Never unmap legacy interrupts */ if (host->revmap_type == IRQ_HOST_MAP_LEGACY) return; irq_set_status_flags(virq, IRQ_NOREQUEST); /* remove chip and handler */ irq_set_chip_and_handler(virq, NULL, NULL); /* Make sure it's completed */ synchronize_irq(virq); /* Tell the PIC about it */ if (host->ops->unmap) host->ops->unmap(host, virq); smp_mb(); /* Clear reverse map */ hwirq = irq_map[virq].hwirq; switch(host->revmap_type) { case IRQ_HOST_MAP_LINEAR: if (hwirq < host->revmap_data.linear.size) host->revmap_data.linear.revmap[hwirq] = NO_IRQ; break; case IRQ_HOST_MAP_TREE: mutex_lock(&revmap_trees_mutex); radix_tree_delete(&host->revmap_data.tree, hwirq); mutex_unlock(&revmap_trees_mutex); break; } /* Destroy map */ smp_mb(); irq_map[virq].hwirq = host->inval_irq; irq_free_descs(virq, 1); /* Free it */ irq_free_virt(virq, 1); } EXPORT_SYMBOL_GPL(irq_dispose_mapping); unsigned int irq_find_mapping(struct irq_host *host, irq_hw_number_t hwirq) { unsigned int i; unsigned int hint = hwirq % irq_virq_count; /* Look for default host if nececssary */ if (host == NULL) host = irq_default_host; if (host == NULL) return NO_IRQ; /* legacy -> bail early */ if (host->revmap_type == IRQ_HOST_MAP_LEGACY) return hwirq; /* Slow path does a linear search of the map */ if (hint < NUM_ISA_INTERRUPTS) hint = NUM_ISA_INTERRUPTS; i = hint; do { if (irq_map[i].host == host && irq_map[i].hwirq == hwirq) return i; i++; if (i >= irq_virq_count) i = NUM_ISA_INTERRUPTS; } while(i != hint); return NO_IRQ; } EXPORT_SYMBOL_GPL(irq_find_mapping); #ifdef CONFIG_SMP int irq_choose_cpu(const struct cpumask *mask) { int cpuid; if (cpumask_equal(mask, cpu_all_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 unsigned int irq_radix_revmap_lookup(struct irq_host *host, irq_hw_number_t hwirq) { struct irq_map_entry *ptr; unsigned int virq; if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_TREE)) return irq_find_mapping(host, hwirq); /* * The ptr returned references the static global irq_map. * but freeing an irq can delete nodes along the path to * do the lookup via call_rcu. */ rcu_read_lock(); ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq); rcu_read_unlock(); /* * If found in radix tree, then fine. * Else fallback to linear lookup - this should not happen in practice * as it means that we failed to insert the node in the radix tree. */ if (ptr) virq = ptr - irq_map; else virq = irq_find_mapping(host, hwirq); return virq; } void irq_radix_revmap_insert(struct irq_host *host, unsigned int virq, irq_hw_number_t hwirq) { if (WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE)) return; if (virq != NO_IRQ) { mutex_lock(&revmap_trees_mutex); radix_tree_insert(&host->revmap_data.tree, hwirq, &irq_map[virq]); mutex_unlock(&revmap_trees_mutex); } } unsigned int irq_linear_revmap(struct irq_host *host, irq_hw_number_t hwirq) { unsigned int *revmap; if (WARN_ON_ONCE(host->revmap_type != IRQ_HOST_MAP_LINEAR)) return irq_find_mapping(host, hwirq); /* Check revmap bounds */ if (unlikely(hwirq >= host->revmap_data.linear.size)) return irq_find_mapping(host, hwirq); /* Check if revmap was allocated */ revmap = host->revmap_data.linear.revmap; if (unlikely(revmap == NULL)) return irq_find_mapping(host, hwirq); /* Fill up revmap with slow path if no mapping found */ if (unlikely(revmap[hwirq] == NO_IRQ)) revmap[hwirq] = irq_find_mapping(host, hwirq); return revmap[hwirq]; } unsigned int irq_alloc_virt(struct irq_host *host, unsigned int count, unsigned int hint) { unsigned long flags; unsigned int i, j, found = NO_IRQ; if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS)) return NO_IRQ; raw_spin_lock_irqsave(&irq_big_lock, flags); /* Use hint for 1 interrupt if any */ if (count == 1 && hint >= NUM_ISA_INTERRUPTS && hint < irq_virq_count && irq_map[hint].host == NULL) { found = hint; goto hint_found; } /* Look for count consecutive numbers in the allocatable * (non-legacy) space */ for (i = NUM_ISA_INTERRUPTS, j = 0; i < irq_virq_count; i++) { if (irq_map[i].host != NULL) j = 0; else j++; if (j == count) { found = i - count + 1; break; } } if (found == NO_IRQ) { raw_spin_unlock_irqrestore(&irq_big_lock, flags); return NO_IRQ; } hint_found: for (i = found; i < (found + count); i++) { irq_map[i].hwirq = host->inval_irq; smp_wmb(); irq_map[i].host = host; } raw_spin_unlock_irqrestore(&irq_big_lock, flags); return found; } void irq_free_virt(unsigned int virq, unsigned int count) { unsigned long flags; unsigned int i; WARN_ON (virq < NUM_ISA_INTERRUPTS); WARN_ON (count == 0 || (virq + count) > irq_virq_count); if (virq < NUM_ISA_INTERRUPTS) { if (virq + count < NUM_ISA_INTERRUPTS) return; count =- NUM_ISA_INTERRUPTS - virq; virq = NUM_ISA_INTERRUPTS; } if (count > irq_virq_count || virq > irq_virq_count - count) { if (virq > irq_virq_count) return; count = irq_virq_count - virq; } raw_spin_lock_irqsave(&irq_big_lock, flags); for (i = virq; i < (virq + count); i++) { struct irq_host *host; host = irq_map[i].host; irq_map[i].hwirq = host->inval_irq; smp_wmb(); irq_map[i].host = NULL; } raw_spin_unlock_irqrestore(&irq_big_lock, flags); } int arch_early_irq_init(void) { return 0; } #ifdef CONFIG_VIRQ_DEBUG static int virq_debug_show(struct seq_file *m, void *private) { unsigned long flags; struct irq_desc *desc; const char *p; static const char none[] = "none"; void *data; int i; seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq", "chip name", "chip data", "host name"); for (i = 1; i < nr_irqs; i++) { desc = irq_to_desc(i); if (!desc) continue; raw_spin_lock_irqsave(&desc->lock, flags); if (desc->action && desc->action->handler) { struct irq_chip *chip; seq_printf(m, "%5d ", i); seq_printf(m, "0x%05lx ", irq_map[i].hwirq); chip = irq_desc_get_chip(desc); if (chip && chip->name) p = chip->name; else p = none; seq_printf(m, "%-15s ", p); data = irq_desc_get_chip_data(desc); seq_printf(m, "0x%16p ", data); if (irq_map[i].host && irq_map[i].host->of_node) p = irq_map[i].host->of_node->full_name; else p = none; seq_printf(m, "%s\n", p); } raw_spin_unlock_irqrestore(&desc->lock, flags); } return 0; } static int virq_debug_open(struct inode *inode, struct file *file) { return single_open(file, virq_debug_show, inode->i_private); } static const struct file_operations virq_debug_fops = { .open = virq_debug_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int __init irq_debugfs_init(void) { if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root, NULL, &virq_debug_fops) == NULL) return -ENOMEM; return 0; } __initcall(irq_debugfs_init); #endif /* CONFIG_VIRQ_DEBUG */ #ifdef CONFIG_PPC64 static int __init setup_noirqdistrib(char *str) { distribute_irqs = 0; return 1; } __setup("noirqdistrib", setup_noirqdistrib); #endif /* CONFIG_PPC64 */