/* * 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 #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 #ifndef CONFIG_SPARSE_IRQ EXPORT_SYMBOL(irq_desc); #endif int distribute_irqs = 1; static inline notrace unsigned long get_hard_enabled(void) { unsigned long enabled; __asm__ __volatile__("lbz %0,%1(13)" : "=r" (enabled) : "i" (offsetof(struct paca_struct, hard_enabled))); return enabled; } 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))); } notrace void arch_local_irq_restore(unsigned long en) { /* * get_paca()->soft_enabled = en; * Is it ever valid to use local_irq_restore(0) when soft_enabled is 1? * That was allowed before, and in such a case we do need to take care * that gcc will set soft_enabled directly via r13, not choose to use * an intermediate register, lest we're preempted to a different cpu. */ set_soft_enabled(en); if (!en) return; #ifdef CONFIG_PPC_STD_MMU_64 if (firmware_has_feature(FW_FEATURE_ISERIES)) { /* * Do we need to disable preemption here? Not really: in the * unlikely event that we're preempted to a different cpu in * between getting r13, loading its lppaca_ptr, and loading * its any_int, we might call iseries_handle_interrupts without * an interrupt pending on the new cpu, but that's no disaster, * is it? And the business of preempting us off the old cpu * would itself involve a local_irq_restore which handles the * interrupt to that cpu. * * But use "local_paca->lppaca_ptr" instead of "get_lppaca()" * to avoid any preemption checking added into get_paca(). */ if (local_paca->lppaca_ptr->int_dword.any_int) iseries_handle_interrupts(); } #endif /* CONFIG_PPC_STD_MMU_64 */ /* * if (get_paca()->hard_enabled) return; * But again we need to take care that gcc gets hard_enabled directly * via r13, not choose to use an intermediate register, lest we're * preempted to a different cpu in between the two instructions. */ if (get_hard_enabled()) return; #if defined(CONFIG_BOOKE) && defined(CONFIG_SMP) /* Check for pending doorbell interrupts and resend to ourself */ doorbell_check_self(); #endif /* * Need to hard-enable interrupts here. Since currently disabled, * no need to take further asm precautions against preemption; but * use local_paca instead of get_paca() to avoid preemption checking. */ local_paca->hard_enabled = en; #ifndef CONFIG_BOOKE /* On server, re-trigger the decrementer if it went negative since * some processors only trigger on edge transitions of the sign bit. * * BookE has a level sensitive decrementer (latches in TSR) so we * don't need that */ if ((int)mfspr(SPRN_DEC) < 0) mtspr(SPRN_DEC, 1); #endif /* CONFIG_BOOKE */ /* * 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; lv1_get_version_info(&tmp); } __hard_irq_enable(); } EXPORT_SYMBOL(arch_local_irq_restore); #endif /* CONFIG_PPC64 */ static int show_other_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; } int show_interrupts(struct seq_file *p, void *v) { unsigned long flags, any_count = 0; int i = *(loff_t *) v, j, prec; struct irqaction *action; struct irq_desc *desc; if (i > nr_irqs) return 0; for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec) j *= 10; if (i == nr_irqs) return show_other_interrupts(p, prec); /* print header */ if (i == 0) { seq_printf(p, "%*s", prec + 8, ""); for_each_online_cpu(j) seq_printf(p, "CPU%-8d", j); seq_putc(p, '\n'); } desc = irq_to_desc(i); if (!desc) return 0; raw_spin_lock_irqsave(&desc->lock, flags); for_each_online_cpu(j) any_count |= kstat_irqs_cpu(i, j); action = desc->action; if (!action && !any_count) goto out; seq_printf(p, "%*d: ", prec, i); for_each_online_cpu(j) seq_printf(p, "%10u ", kstat_irqs_cpu(i, j)); if (desc->chip) seq_printf(p, " %-16s", desc->chip->name); else seq_printf(p, " %-16s", "None"); seq_printf(p, " %-8s", (desc->status & IRQ_LEVEL) ? "Level" : "Edge"); if (action) { seq_printf(p, " %s", action->name); while ((action = action->next) != NULL) seq_printf(p, ", %s", action->name); } seq_putc(p, '\n'); out: raw_spin_unlock_irqrestore(&desc->lock, flags); 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 fixup_irqs(const struct cpumask *map) { struct irq_desc *desc; unsigned int irq; static int warned; cpumask_var_t mask; alloc_cpumask_var(&mask, GFP_KERNEL); for_each_irq(irq) { desc = irq_to_desc(irq); if (!desc) continue; if (desc->status & IRQ_PER_CPU) continue; cpumask_and(mask, desc->affinity, map); if (cpumask_any(mask) >= nr_cpu_ids) { printk("Breaking affinity for irq %i\n", irq); cpumask_copy(mask, map); } if (desc->chip->set_affinity) desc->chip->set_affinity(irq, mask); 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; /* 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 */ generic_handle_irq(irq); return; } desc = irq_to_desc(irq); 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(); irq = ppc_md.get_irq(); 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); #ifdef CONFIG_PPC_ISERIES if (firmware_has_feature(FW_FEATURE_ISERIES) && get_lppaca()->int_dword.fields.decr_int) { get_lppaca()->int_dword.fields.decr_int = 0; /* Signal a fake decrementer interrupt */ timer_interrupt(regs); } #endif 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, hw_cpu; for_each_possible_cpu(i) { hw_cpu = get_hard_smp_processor_id(i); memset((void *)critirq_ctx[hw_cpu], 0, THREAD_SIZE); tp = critirq_ctx[hw_cpu]; tp->cpu = i; tp->preempt_count = 0; #ifdef CONFIG_BOOKE memset((void *)dbgirq_ctx[hw_cpu], 0, THREAD_SIZE); tp = dbgirq_ctx[hw_cpu]; tp->cpu = i; tp->preempt_count = 0; memset((void *)mcheckirq_ctx[hw_cpu], 0, THREAD_SIZE); tp = mcheckirq_ctx[hw_cpu]; tp->cpu = i; 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; 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; } 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 */ static LIST_HEAD(irq_hosts); static DEFINE_RAW_SPINLOCK(irq_big_lock); static unsigned int revmap_trees_allocated; static DEFINE_MUTEX(revmap_trees_mutex); 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 virq_to_hw(unsigned int virq) { return irq_map[virq].hwirq; } EXPORT_SYMBOL_GPL(virq_to_hw); 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 = zalloc_maybe_bootmem(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); /* If we are early boot, we can't free the structure, * too bad... * this will be fixed once slab is made available early * instead of the current cruft */ if (mem_init_done) { 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(); /* Clear norequest flags */ irq_to_desc(i)->status &= ~IRQ_NOREQUEST; /* 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); } 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; 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; } irq_clear_status_flags(virq, IRQ_NOREQUEST); /* 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; } 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 exist, if it does, call * host->ops->map() to update the flags */ virq = irq_find_mapping(host, hwirq); if (virq != NO_IRQ) { if (host->ops->remap) host->ops->remap(host, virq, hwirq); 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; printk(KERN_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 != (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK)) 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; WARN_ON (host == NULL); if (host == NULL) return; /* Never unmap legacy interrupts */ if (host->revmap_type == IRQ_HOST_MAP_LEGACY) return; /* remove chip and handler */ set_irq_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: /* * Check if radix tree allocated yet, if not then nothing to * remove. */ smp_rmb(); if (revmap_trees_allocated < 1) break; 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_set_status_flags(virq, IRQ_NOREQUEST); 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); unsigned int irq_radix_revmap_lookup(struct irq_host *host, irq_hw_number_t hwirq) { struct irq_map_entry *ptr; unsigned int virq; WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE); /* * Check if the radix tree exists and has bee initialized. * If not, we fallback to slow mode */ if (revmap_trees_allocated < 2) return irq_find_mapping(host, hwirq); /* Now try to resolve */ /* * No rcu_read_lock(ing) needed, the ptr returned can't go under us * as it's referencing an entry in the static irq_map table. */ ptr = radix_tree_lookup(&host->revmap_data.tree, hwirq); /* * 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) { WARN_ON(host->revmap_type != IRQ_HOST_MAP_TREE); /* * Check if the radix tree exists yet. * If not, then the irq will be inserted into the tree when it gets * initialized. */ smp_rmb(); if (revmap_trees_allocated < 1) 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; WARN_ON(host->revmap_type != IRQ_HOST_MAP_LINEAR); /* 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); raw_spin_lock_irqsave(&irq_big_lock, flags); for (i = virq; i < (virq + count); i++) { struct irq_host *host; if (i < NUM_ISA_INTERRUPTS || (virq + count) > irq_virq_count) continue; 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; } /* We need to create the radix trees late */ static int irq_late_init(void) { struct irq_host *h; unsigned int i; /* * No mutual exclusion with respect to accessors of the tree is needed * here as the synchronization is done via the state variable * revmap_trees_allocated. */ list_for_each_entry(h, &irq_hosts, link) { if (h->revmap_type == IRQ_HOST_MAP_TREE) INIT_RADIX_TREE(&h->revmap_data.tree, GFP_KERNEL); } /* * Make sure the radix trees inits are visible before setting * the flag */ smp_wmb(); revmap_trees_allocated = 1; /* * Insert the reverse mapping for those interrupts already present * in irq_map[]. */ mutex_lock(&revmap_trees_mutex); for (i = 0; i < irq_virq_count; i++) { if (irq_map[i].host && (irq_map[i].host->revmap_type == IRQ_HOST_MAP_TREE)) radix_tree_insert(&irq_map[i].host->revmap_data.tree, irq_map[i].hwirq, &irq_map[i]); } mutex_unlock(&revmap_trees_mutex); /* * Make sure the radix trees insertions are visible before setting * the flag */ smp_wmb(); revmap_trees_allocated = 2; return 0; } arch_initcall(irq_late_init); #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"; int i; seq_printf(m, "%-5s %-7s %-15s %s\n", "virq", "hwirq", "chip name", "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) { seq_printf(m, "%5d ", i); seq_printf(m, "0x%05lx ", virq_to_hw(i)); if (desc->chip && desc->chip->name) p = desc->chip->name; else p = none; seq_printf(m, "%-15s ", p); 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 */