| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Thomas Gleixner | 3077 | 60.31% | 46 | 61.33% |
| Jiang Liu | 1960 | 38.42% | 20 | 26.67% |
| Mika Westerberg | 26 | 0.51% | 1 | 1.33% |
| Dou Liyang | 14 | 0.27% | 2 | 2.67% |
| Jake Oshins | 10 | 0.20% | 1 | 1.33% |
| Borislav Petkov | 7 | 0.14% | 2 | 2.67% |
| Vitaly Kuznetsov | 4 | 0.08% | 1 | 1.33% |
| Nicolai Stange | 3 | 0.06% | 1 | 1.33% |
| Colin Ian King | 1 | 0.02% | 1 | 1.33% |
| Total | 5102 | 75 |
// SPDX-License-Identifier: GPL-2.0-only /* * Local APIC related interfaces to support IOAPIC, MSI, etc. * * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo * Moved from arch/x86/kernel/apic/io_apic.c. * Jiang Liu <jiang.liu@linux.intel.com> * Enable support of hierarchical irqdomains */ #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/seq_file.h> #include <linux/init.h> #include <linux/compiler.h> #include <linux/slab.h> #include <asm/irqdomain.h> #include <asm/hw_irq.h> #include <asm/traps.h> #include <asm/apic.h> #include <asm/i8259.h> #include <asm/desc.h> #include <asm/irq_remapping.h> #include <asm/trace/irq_vectors.h> struct apic_chip_data { struct irq_cfg hw_irq_cfg; unsigned int vector; unsigned int prev_vector; unsigned int cpu; unsigned int prev_cpu; unsigned int irq; struct hlist_node clist; unsigned int move_in_progress : 1, is_managed : 1, can_reserve : 1, has_reserved : 1; }; struct irq_domain *x86_vector_domain; EXPORT_SYMBOL_GPL(x86_vector_domain); static DEFINE_RAW_SPINLOCK(vector_lock); static cpumask_var_t vector_searchmask; static struct irq_chip lapic_controller; static struct irq_matrix *vector_matrix; #ifdef CONFIG_SMP static DEFINE_PER_CPU(struct hlist_head, cleanup_list); #endif void lock_vector_lock(void) { /* Used to the online set of cpus does not change * during assign_irq_vector. */ raw_spin_lock(&vector_lock); } void unlock_vector_lock(void) { raw_spin_unlock(&vector_lock); } void init_irq_alloc_info(struct irq_alloc_info *info, const struct cpumask *mask) { memset(info, 0, sizeof(*info)); info->mask = mask; } void copy_irq_alloc_info(struct irq_alloc_info *dst, struct irq_alloc_info *src) { if (src) *dst = *src; else memset(dst, 0, sizeof(*dst)); } static struct apic_chip_data *apic_chip_data(struct irq_data *irqd) { if (!irqd) return NULL; while (irqd->parent_data) irqd = irqd->parent_data; return irqd->chip_data; } struct irq_cfg *irqd_cfg(struct irq_data *irqd) { struct apic_chip_data *apicd = apic_chip_data(irqd); return apicd ? &apicd->hw_irq_cfg : NULL; } EXPORT_SYMBOL_GPL(irqd_cfg); struct irq_cfg *irq_cfg(unsigned int irq) { return irqd_cfg(irq_get_irq_data(irq)); } static struct apic_chip_data *alloc_apic_chip_data(int node) { struct apic_chip_data *apicd; apicd = kzalloc_node(sizeof(*apicd), GFP_KERNEL, node); if (apicd) INIT_HLIST_NODE(&apicd->clist); return apicd; } static void free_apic_chip_data(struct apic_chip_data *apicd) { kfree(apicd); } static void apic_update_irq_cfg(struct irq_data *irqd, unsigned int vector, unsigned int cpu) { struct apic_chip_data *apicd = apic_chip_data(irqd); lockdep_assert_held(&vector_lock); apicd->hw_irq_cfg.vector = vector; apicd->hw_irq_cfg.dest_apicid = apic->calc_dest_apicid(cpu); irq_data_update_effective_affinity(irqd, cpumask_of(cpu)); trace_vector_config(irqd->irq, vector, cpu, apicd->hw_irq_cfg.dest_apicid); } static void apic_update_vector(struct irq_data *irqd, unsigned int newvec, unsigned int newcpu) { struct apic_chip_data *apicd = apic_chip_data(irqd); struct irq_desc *desc = irq_data_to_desc(irqd); bool managed = irqd_affinity_is_managed(irqd); lockdep_assert_held(&vector_lock); trace_vector_update(irqd->irq, newvec, newcpu, apicd->vector, apicd->cpu); /* * If there is no vector associated or if the associated vector is * the shutdown vector, which is associated to make PCI/MSI * shutdown mode work, then there is nothing to release. Clear out * prev_vector for this and the offlined target case. */ apicd->prev_vector = 0; if (!apicd->vector || apicd->vector == MANAGED_IRQ_SHUTDOWN_VECTOR) goto setnew; /* * If the target CPU of the previous vector is online, then mark * the vector as move in progress and store it for cleanup when the * first interrupt on the new vector arrives. If the target CPU is * offline then the regular release mechanism via the cleanup * vector is not possible and the vector can be immediately freed * in the underlying matrix allocator. */ if (cpu_online(apicd->cpu)) { apicd->move_in_progress = true; apicd->prev_vector = apicd->vector; apicd->prev_cpu = apicd->cpu; } else { irq_matrix_free(vector_matrix, apicd->cpu, apicd->vector, managed); } setnew: apicd->vector = newvec; apicd->cpu = newcpu; BUG_ON(!IS_ERR_OR_NULL(per_cpu(vector_irq, newcpu)[newvec])); per_cpu(vector_irq, newcpu)[newvec] = desc; } static void vector_assign_managed_shutdown(struct irq_data *irqd) { unsigned int cpu = cpumask_first(cpu_online_mask); apic_update_irq_cfg(irqd, MANAGED_IRQ_SHUTDOWN_VECTOR, cpu); } static int reserve_managed_vector(struct irq_data *irqd) { const struct cpumask *affmsk = irq_data_get_affinity_mask(irqd); struct apic_chip_data *apicd = apic_chip_data(irqd); unsigned long flags; int ret; raw_spin_lock_irqsave(&vector_lock, flags); apicd->is_managed = true; ret = irq_matrix_reserve_managed(vector_matrix, affmsk); raw_spin_unlock_irqrestore(&vector_lock, flags); trace_vector_reserve_managed(irqd->irq, ret); return ret; } static void reserve_irq_vector_locked(struct irq_data *irqd) { struct apic_chip_data *apicd = apic_chip_data(irqd); irq_matrix_reserve(vector_matrix); apicd->can_reserve = true; apicd->has_reserved = true; irqd_set_can_reserve(irqd); trace_vector_reserve(irqd->irq, 0); vector_assign_managed_shutdown(irqd); } static int reserve_irq_vector(struct irq_data *irqd) { unsigned long flags; raw_spin_lock_irqsave(&vector_lock, flags); reserve_irq_vector_locked(irqd); raw_spin_unlock_irqrestore(&vector_lock, flags); return 0; } static int assign_vector_locked(struct irq_data *irqd, const struct cpumask *dest) { struct apic_chip_data *apicd = apic_chip_data(irqd); bool resvd = apicd->has_reserved; unsigned int cpu = apicd->cpu; int vector = apicd->vector; lockdep_assert_held(&vector_lock); /* * If the current target CPU is online and in the new requested * affinity mask, there is no point in moving the interrupt from * one CPU to another. */ if (vector && cpu_online(cpu) && cpumask_test_cpu(cpu, dest)) return 0; /* * Careful here. @apicd might either have move_in_progress set or * be enqueued for cleanup. Assigning a new vector would either * leave a stale vector on some CPU around or in case of a pending * cleanup corrupt the hlist. */ if (apicd->move_in_progress || !hlist_unhashed(&apicd->clist)) return -EBUSY; vector = irq_matrix_alloc(vector_matrix, dest, resvd, &cpu); trace_vector_alloc(irqd->irq, vector, resvd, vector); if (vector < 0) return vector; apic_update_vector(irqd, vector, cpu); apic_update_irq_cfg(irqd, vector, cpu); return 0; } static int assign_irq_vector(struct irq_data *irqd, const struct cpumask *dest) { unsigned long flags; int ret; raw_spin_lock_irqsave(&vector_lock, flags); cpumask_and(vector_searchmask, dest, cpu_online_mask); ret = assign_vector_locked(irqd, vector_searchmask); raw_spin_unlock_irqrestore(&vector_lock, flags); return ret; } static int assign_irq_vector_any_locked(struct irq_data *irqd) { /* Get the affinity mask - either irq_default_affinity or (user) set */ const struct cpumask *affmsk = irq_data_get_affinity_mask(irqd); int node = irq_data_get_node(irqd); if (node == NUMA_NO_NODE) goto all; /* Try the intersection of @affmsk and node mask */ cpumask_and(vector_searchmask, cpumask_of_node(node), affmsk); if (!assign_vector_locked(irqd, vector_searchmask)) return 0; /* Try the node mask */ if (!assign_vector_locked(irqd, cpumask_of_node(node))) return 0; all: /* Try the full affinity mask */ cpumask_and(vector_searchmask, affmsk, cpu_online_mask); if (!assign_vector_locked(irqd, vector_searchmask)) return 0; /* Try the full online mask */ return assign_vector_locked(irqd, cpu_online_mask); } static int assign_irq_vector_policy(struct irq_data *irqd, struct irq_alloc_info *info) { if (irqd_affinity_is_managed(irqd)) return reserve_managed_vector(irqd); if (info->mask) return assign_irq_vector(irqd, info->mask); /* * Make only a global reservation with no guarantee. A real vector * is associated at activation time. */ return reserve_irq_vector(irqd); } static int assign_managed_vector(struct irq_data *irqd, const struct cpumask *dest) { const struct cpumask *affmsk = irq_data_get_affinity_mask(irqd); struct apic_chip_data *apicd = apic_chip_data(irqd); int vector, cpu; cpumask_and(vector_searchmask, dest, affmsk); /* set_affinity might call here for nothing */ if (apicd->vector && cpumask_test_cpu(apicd->cpu, vector_searchmask)) return 0; vector = irq_matrix_alloc_managed(vector_matrix, vector_searchmask, &cpu); trace_vector_alloc_managed(irqd->irq, vector, vector); if (vector < 0) return vector; apic_update_vector(irqd, vector, cpu); apic_update_irq_cfg(irqd, vector, cpu); return 0; } static void clear_irq_vector(struct irq_data *irqd) { struct apic_chip_data *apicd = apic_chip_data(irqd); bool managed = irqd_affinity_is_managed(irqd); unsigned int vector = apicd->vector; lockdep_assert_held(&vector_lock); if (!vector) return; trace_vector_clear(irqd->irq, vector, apicd->cpu, apicd->prev_vector, apicd->prev_cpu); per_cpu(vector_irq, apicd->cpu)[vector] = VECTOR_UNUSED; irq_matrix_free(vector_matrix, apicd->cpu, vector, managed); apicd->vector = 0; /* Clean up move in progress */ vector = apicd->prev_vector; if (!vector) return; per_cpu(vector_irq, apicd->prev_cpu)[vector] = VECTOR_UNUSED; irq_matrix_free(vector_matrix, apicd->prev_cpu, vector, managed); apicd->prev_vector = 0; apicd->move_in_progress = 0; hlist_del_init(&apicd->clist); } static void x86_vector_deactivate(struct irq_domain *dom, struct irq_data *irqd) { struct apic_chip_data *apicd = apic_chip_data(irqd); unsigned long flags; trace_vector_deactivate(irqd->irq, apicd->is_managed, apicd->can_reserve, false); /* Regular fixed assigned interrupt */ if (!apicd->is_managed && !apicd->can_reserve) return; /* If the interrupt has a global reservation, nothing to do */ if (apicd->has_reserved) return; raw_spin_lock_irqsave(&vector_lock, flags); clear_irq_vector(irqd); if (apicd->can_reserve) reserve_irq_vector_locked(irqd); else vector_assign_managed_shutdown(irqd); raw_spin_unlock_irqrestore(&vector_lock, flags); } static int activate_reserved(struct irq_data *irqd) { struct apic_chip_data *apicd = apic_chip_data(irqd); int ret; ret = assign_irq_vector_any_locked(irqd); if (!ret) { apicd->has_reserved = false; /* * Core might have disabled reservation mode after * allocating the irq descriptor. Ideally this should * happen before allocation time, but that would require * completely convoluted ways of transporting that * information. */ if (!irqd_can_reserve(irqd)) apicd->can_reserve = false; } return ret; } static int activate_managed(struct irq_data *irqd) { const struct cpumask *dest = irq_data_get_affinity_mask(irqd); int ret; cpumask_and(vector_searchmask, dest, cpu_online_mask); if (WARN_ON_ONCE(cpumask_empty(vector_searchmask))) { /* Something in the core code broke! Survive gracefully */ pr_err("Managed startup for irq %u, but no CPU\n", irqd->irq); return -EINVAL; } ret = assign_managed_vector(irqd, vector_searchmask); /* * This should not happen. The vector reservation got buggered. Handle * it gracefully. */ if (WARN_ON_ONCE(ret < 0)) { pr_err("Managed startup irq %u, no vector available\n", irqd->irq); } return ret; } static int x86_vector_activate(struct irq_domain *dom, struct irq_data *irqd, bool reserve) { struct apic_chip_data *apicd = apic_chip_data(irqd); unsigned long flags; int ret = 0; trace_vector_activate(irqd->irq, apicd->is_managed, apicd->can_reserve, reserve); /* Nothing to do for fixed assigned vectors */ if (!apicd->can_reserve && !apicd->is_managed) return 0; raw_spin_lock_irqsave(&vector_lock, flags); if (reserve || irqd_is_managed_and_shutdown(irqd)) vector_assign_managed_shutdown(irqd); else if (apicd->is_managed) ret = activate_managed(irqd); else if (apicd->has_reserved) ret = activate_reserved(irqd); raw_spin_unlock_irqrestore(&vector_lock, flags); return ret; } static void vector_free_reserved_and_managed(struct irq_data *irqd) { const struct cpumask *dest = irq_data_get_affinity_mask(irqd); struct apic_chip_data *apicd = apic_chip_data(irqd); trace_vector_teardown(irqd->irq, apicd->is_managed, apicd->has_reserved); if (apicd->has_reserved) irq_matrix_remove_reserved(vector_matrix); if (apicd->is_managed) irq_matrix_remove_managed(vector_matrix, dest); } static void x86_vector_free_irqs(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs) { struct apic_chip_data *apicd; struct irq_data *irqd; unsigned long flags; int i; for (i = 0; i < nr_irqs; i++) { irqd = irq_domain_get_irq_data(x86_vector_domain, virq + i); if (irqd && irqd->chip_data) { raw_spin_lock_irqsave(&vector_lock, flags); clear_irq_vector(irqd); vector_free_reserved_and_managed(irqd); apicd = irqd->chip_data; irq_domain_reset_irq_data(irqd); raw_spin_unlock_irqrestore(&vector_lock, flags); free_apic_chip_data(apicd); } } } static bool vector_configure_legacy(unsigned int virq, struct irq_data *irqd, struct apic_chip_data *apicd) { unsigned long flags; bool realloc = false; apicd->vector = ISA_IRQ_VECTOR(virq); apicd->cpu = 0; raw_spin_lock_irqsave(&vector_lock, flags); /* * If the interrupt is activated, then it must stay at this vector * position. That's usually the timer interrupt (0). */ if (irqd_is_activated(irqd)) { trace_vector_setup(virq, true, 0); apic_update_irq_cfg(irqd, apicd->vector, apicd->cpu); } else { /* Release the vector */ apicd->can_reserve = true; irqd_set_can_reserve(irqd); clear_irq_vector(irqd); realloc = true; } raw_spin_unlock_irqrestore(&vector_lock, flags); return realloc; } static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs, void *arg) { struct irq_alloc_info *info = arg; struct apic_chip_data *apicd; struct irq_data *irqd; int i, err, node; if (disable_apic) return -ENXIO; /* Currently vector allocator can't guarantee contiguous allocations */ if ((info->flags & X86_IRQ_ALLOC_CONTIGUOUS_VECTORS) && nr_irqs > 1) return -ENOSYS; for (i = 0; i < nr_irqs; i++) { irqd = irq_domain_get_irq_data(domain, virq + i); BUG_ON(!irqd); node = irq_data_get_node(irqd); WARN_ON_ONCE(irqd->chip_data); apicd = alloc_apic_chip_data(node); if (!apicd) { err = -ENOMEM; goto error; } apicd->irq = virq + i; irqd->chip = &lapic_controller; irqd->chip_data = apicd; irqd->hwirq = virq + i; irqd_set_single_target(irqd); /* * Legacy vectors are already assigned when the IOAPIC * takes them over. They stay on the same vector. This is * required for check_timer() to work correctly as it might * switch back to legacy mode. Only update the hardware * config. */ if (info->flags & X86_IRQ_ALLOC_LEGACY) { if (!vector_configure_legacy(virq + i, irqd, apicd)) continue; } err = assign_irq_vector_policy(irqd, info); trace_vector_setup(virq + i, false, err); if (err) { irqd->chip_data = NULL; free_apic_chip_data(apicd); goto error; } } return 0; error: x86_vector_free_irqs(domain, virq, i); return err; } #ifdef CONFIG_GENERIC_IRQ_DEBUGFS static void x86_vector_debug_show(struct seq_file *m, struct irq_domain *d, struct irq_data *irqd, int ind) { struct apic_chip_data apicd; unsigned long flags; int irq; if (!irqd) { irq_matrix_debug_show(m, vector_matrix, ind); return; } irq = irqd->irq; if (irq < nr_legacy_irqs() && !test_bit(irq, &io_apic_irqs)) { seq_printf(m, "%*sVector: %5d\n", ind, "", ISA_IRQ_VECTOR(irq)); seq_printf(m, "%*sTarget: Legacy PIC all CPUs\n", ind, ""); return; } if (!irqd->chip_data) { seq_printf(m, "%*sVector: Not assigned\n", ind, ""); return; } raw_spin_lock_irqsave(&vector_lock, flags); memcpy(&apicd, irqd->chip_data, sizeof(apicd)); raw_spin_unlock_irqrestore(&vector_lock, flags); seq_printf(m, "%*sVector: %5u\n", ind, "", apicd.vector); seq_printf(m, "%*sTarget: %5u\n", ind, "", apicd.cpu); if (apicd.prev_vector) { seq_printf(m, "%*sPrevious vector: %5u\n", ind, "", apicd.prev_vector); seq_printf(m, "%*sPrevious target: %5u\n", ind, "", apicd.prev_cpu); } seq_printf(m, "%*smove_in_progress: %u\n", ind, "", apicd.move_in_progress ? 1 : 0); seq_printf(m, "%*sis_managed: %u\n", ind, "", apicd.is_managed ? 1 : 0); seq_printf(m, "%*scan_reserve: %u\n", ind, "", apicd.can_reserve ? 1 : 0); seq_printf(m, "%*shas_reserved: %u\n", ind, "", apicd.has_reserved ? 1 : 0); seq_printf(m, "%*scleanup_pending: %u\n", ind, "", !hlist_unhashed(&apicd.clist)); } #endif static const struct irq_domain_ops x86_vector_domain_ops = { .alloc = x86_vector_alloc_irqs, .free = x86_vector_free_irqs, .activate = x86_vector_activate, .deactivate = x86_vector_deactivate, #ifdef CONFIG_GENERIC_IRQ_DEBUGFS .debug_show = x86_vector_debug_show, #endif }; int __init arch_probe_nr_irqs(void) { int nr; if (nr_irqs > (NR_VECTORS * nr_cpu_ids)) nr_irqs = NR_VECTORS * nr_cpu_ids; nr = (gsi_top + nr_legacy_irqs()) + 8 * nr_cpu_ids; #if defined(CONFIG_PCI_MSI) /* * for MSI and HT dyn irq */ if (gsi_top <= NR_IRQS_LEGACY) nr += 8 * nr_cpu_ids; else nr += gsi_top * 16; #endif if (nr < nr_irqs) nr_irqs = nr; /* * We don't know if PIC is present at this point so we need to do * probe() to get the right number of legacy IRQs. */ return legacy_pic->probe(); } void lapic_assign_legacy_vector(unsigned int irq, bool replace) { /* * Use assign system here so it wont get accounted as allocated * and moveable in the cpu hotplug check and it prevents managed * irq reservation from touching it. */ irq_matrix_assign_system(vector_matrix, ISA_IRQ_VECTOR(irq), replace); } void __init lapic_assign_system_vectors(void) { unsigned int i, vector = 0; for_each_set_bit_from(vector, system_vectors, NR_VECTORS) irq_matrix_assign_system(vector_matrix, vector, false); if (nr_legacy_irqs() > 1) lapic_assign_legacy_vector(PIC_CASCADE_IR, false); /* System vectors are reserved, online it */ irq_matrix_online(vector_matrix); /* Mark the preallocated legacy interrupts */ for (i = 0; i < nr_legacy_irqs(); i++) { if (i != PIC_CASCADE_IR) irq_matrix_assign(vector_matrix, ISA_IRQ_VECTOR(i)); } } int __init arch_early_irq_init(void) { struct fwnode_handle *fn; fn = irq_domain_alloc_named_fwnode("VECTOR"); BUG_ON(!fn); x86_vector_domain = irq_domain_create_tree(fn, &x86_vector_domain_ops, NULL); BUG_ON(x86_vector_domain == NULL); irq_domain_free_fwnode(fn); irq_set_default_host(x86_vector_domain); arch_init_msi_domain(x86_vector_domain); BUG_ON(!alloc_cpumask_var(&vector_searchmask, GFP_KERNEL)); /* * Allocate the vector matrix allocator data structure and limit the * search area. */ vector_matrix = irq_alloc_matrix(NR_VECTORS, FIRST_EXTERNAL_VECTOR, FIRST_SYSTEM_VECTOR); BUG_ON(!vector_matrix); return arch_early_ioapic_init(); } #ifdef CONFIG_SMP static struct irq_desc *__setup_vector_irq(int vector) { int isairq = vector - ISA_IRQ_VECTOR(0); /* Check whether the irq is in the legacy space */ if (isairq < 0 || isairq >= nr_legacy_irqs()) return VECTOR_UNUSED; /* Check whether the irq is handled by the IOAPIC */ if (test_bit(isairq, &io_apic_irqs)) return VECTOR_UNUSED; return irq_to_desc(isairq); } /* Online the local APIC infrastructure and initialize the vectors */ void lapic_online(void) { unsigned int vector; lockdep_assert_held(&vector_lock); /* Online the vector matrix array for this CPU */ irq_matrix_online(vector_matrix); /* * The interrupt affinity logic never targets interrupts to offline * CPUs. The exception are the legacy PIC interrupts. In general * they are only targeted to CPU0, but depending on the platform * they can be distributed to any online CPU in hardware. The * kernel has no influence on that. So all active legacy vectors * must be installed on all CPUs. All non legacy interrupts can be * cleared. */ for (vector = 0; vector < NR_VECTORS; vector++) this_cpu_write(vector_irq[vector], __setup_vector_irq(vector)); } void lapic_offline(void) { lock_vector_lock(); irq_matrix_offline(vector_matrix); unlock_vector_lock(); } static int apic_set_affinity(struct irq_data *irqd, const struct cpumask *dest, bool force) { struct apic_chip_data *apicd = apic_chip_data(irqd); int err; /* * Core code can call here for inactive interrupts. For inactive * interrupts which use managed or reservation mode there is no * point in going through the vector assignment right now as the * activation will assign a vector which fits the destination * cpumask. Let the core code store the destination mask and be * done with it. */ if (!irqd_is_activated(irqd) && (apicd->is_managed || apicd->can_reserve)) return IRQ_SET_MASK_OK; raw_spin_lock(&vector_lock); cpumask_and(vector_searchmask, dest, cpu_online_mask); if (irqd_affinity_is_managed(irqd)) err = assign_managed_vector(irqd, vector_searchmask); else err = assign_vector_locked(irqd, vector_searchmask); raw_spin_unlock(&vector_lock); return err ? err : IRQ_SET_MASK_OK; } #else # define apic_set_affinity NULL #endif static int apic_retrigger_irq(struct irq_data *irqd) { struct apic_chip_data *apicd = apic_chip_data(irqd); unsigned long flags; raw_spin_lock_irqsave(&vector_lock, flags); apic->send_IPI(apicd->cpu, apicd->vector); raw_spin_unlock_irqrestore(&vector_lock, flags); return 1; } void apic_ack_irq(struct irq_data *irqd) { irq_move_irq(irqd); ack_APIC_irq(); } void apic_ack_edge(struct irq_data *irqd) { irq_complete_move(irqd_cfg(irqd)); apic_ack_irq(irqd); } static struct irq_chip lapic_controller = { .name = "APIC", .irq_ack = apic_ack_edge, .irq_set_affinity = apic_set_affinity, .irq_retrigger = apic_retrigger_irq, }; #ifdef CONFIG_SMP static void free_moved_vector(struct apic_chip_data *apicd) { unsigned int vector = apicd->prev_vector; unsigned int cpu = apicd->prev_cpu; bool managed = apicd->is_managed; /* * This should never happen. Managed interrupts are not * migrated except on CPU down, which does not involve the * cleanup vector. But try to keep the accounting correct * nevertheless. */ WARN_ON_ONCE(managed); trace_vector_free_moved(apicd->irq, cpu, vector, managed); irq_matrix_free(vector_matrix, cpu, vector, managed); per_cpu(vector_irq, cpu)[vector] = VECTOR_UNUSED; hlist_del_init(&apicd->clist); apicd->prev_vector = 0; apicd->move_in_progress = 0; } asmlinkage __visible void __irq_entry smp_irq_move_cleanup_interrupt(void) { struct hlist_head *clhead = this_cpu_ptr(&cleanup_list); struct apic_chip_data *apicd; struct hlist_node *tmp; entering_ack_irq(); /* Prevent vectors vanishing under us */ raw_spin_lock(&vector_lock); hlist_for_each_entry_safe(apicd, tmp, clhead, clist) { unsigned int irr, vector = apicd->prev_vector; /* * Paranoia: Check if the vector that needs to be cleaned * up is registered at the APICs IRR. If so, then this is * not the best time to clean it up. Clean it up in the * next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR * to this CPU. IRQ_MOVE_CLEANUP_VECTOR is the lowest * priority external vector, so on return from this * interrupt the device interrupt will happen first. */ irr = apic_read(APIC_IRR + (vector / 32 * 0x10)); if (irr & (1U << (vector % 32))) { apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR); continue; } free_moved_vector(apicd); } raw_spin_unlock(&vector_lock); exiting_irq(); } static void __send_cleanup_vector(struct apic_chip_data *apicd) { unsigned int cpu; raw_spin_lock(&vector_lock); apicd->move_in_progress = 0; cpu = apicd->prev_cpu; if (cpu_online(cpu)) { hlist_add_head(&apicd->clist, per_cpu_ptr(&cleanup_list, cpu)); apic->send_IPI(cpu, IRQ_MOVE_CLEANUP_VECTOR); } else { apicd->prev_vector = 0; } raw_spin_unlock(&vector_lock); } void send_cleanup_vector(struct irq_cfg *cfg) { struct apic_chip_data *apicd; apicd = container_of(cfg, struct apic_chip_data, hw_irq_cfg); if (apicd->move_in_progress) __send_cleanup_vector(apicd); } static void __irq_complete_move(struct irq_cfg *cfg, unsigned vector) { struct apic_chip_data *apicd; apicd = container_of(cfg, struct apic_chip_data, hw_irq_cfg); if (likely(!apicd->move_in_progress)) return; if (vector == apicd->vector && apicd->cpu == smp_processor_id()) __send_cleanup_vector(apicd); } void irq_complete_move(struct irq_cfg *cfg) { __irq_complete_move(cfg, ~get_irq_regs()->orig_ax); } /* * Called from fixup_irqs() with @desc->lock held and interrupts disabled. */ void irq_force_complete_move(struct irq_desc *desc) { struct apic_chip_data *apicd; struct irq_data *irqd; unsigned int vector; /* * The function is called for all descriptors regardless of which * irqdomain they belong to. For example if an IRQ is provided by * an irq_chip as part of a GPIO driver, the chip data for that * descriptor is specific to the irq_chip in question. * * Check first that the chip_data is what we expect * (apic_chip_data) before touching it any further. */ irqd = irq_domain_get_irq_data(x86_vector_domain, irq_desc_get_irq(desc)); if (!irqd) return; raw_spin_lock(&vector_lock); apicd = apic_chip_data(irqd); if (!apicd) goto unlock; /* * If prev_vector is empty, no action required. */ vector = apicd->prev_vector; if (!vector) goto unlock; /* * This is tricky. If the cleanup of the old vector has not been * done yet, then the following setaffinity call will fail with * -EBUSY. This can leave the interrupt in a stale state. * * All CPUs are stuck in stop machine with interrupts disabled so * calling __irq_complete_move() would be completely pointless. * * 1) The interrupt is in move_in_progress state. That means that we * have not seen an interrupt since the io_apic was reprogrammed to * the new vector. * * 2) The interrupt has fired on the new vector, but the cleanup IPIs * have not been processed yet. */ if (apicd->move_in_progress) { /* * In theory there is a race: * * set_ioapic(new_vector) <-- Interrupt is raised before update * is effective, i.e. it's raised on * the old vector. * * So if the target cpu cannot handle that interrupt before * the old vector is cleaned up, we get a spurious interrupt * and in the worst case the ioapic irq line becomes stale. * * But in case of cpu hotplug this should be a non issue * because if the affinity update happens right before all * cpus rendevouz in stop machine, there is no way that the * interrupt can be blocked on the target cpu because all cpus * loops first with interrupts enabled in stop machine, so the * old vector is not yet cleaned up when the interrupt fires. * * So the only way to run into this issue is if the delivery * of the interrupt on the apic/system bus would be delayed * beyond the point where the target cpu disables interrupts * in stop machine. I doubt that it can happen, but at least * there is a theroretical chance. Virtualization might be * able to expose this, but AFAICT the IOAPIC emulation is not * as stupid as the real hardware. * * Anyway, there is nothing we can do about that at this point * w/o refactoring the whole fixup_irq() business completely. * We print at least the irq number and the old vector number, * so we have the necessary information when a problem in that * area arises. */ pr_warn("IRQ fixup: irq %d move in progress, old vector %d\n", irqd->irq, vector); } free_moved_vector(apicd); unlock: raw_spin_unlock(&vector_lock); } #ifdef CONFIG_HOTPLUG_CPU /* * Note, this is not accurate accounting, but at least good enough to * prevent that the actual interrupt move will run out of vectors. */ int lapic_can_unplug_cpu(void) { unsigned int rsvd, avl, tomove, cpu = smp_processor_id(); int ret = 0; raw_spin_lock(&vector_lock); tomove = irq_matrix_allocated(vector_matrix); avl = irq_matrix_available(vector_matrix, true); if (avl < tomove) { pr_warn("CPU %u has %u vectors, %u available. Cannot disable CPU\n", cpu, tomove, avl); ret = -ENOSPC; goto out; } rsvd = irq_matrix_reserved(vector_matrix); if (avl < rsvd) { pr_warn("Reserved vectors %u > available %u. IRQ request may fail\n", rsvd, avl); } out: raw_spin_unlock(&vector_lock); return ret; } #endif /* HOTPLUG_CPU */ #endif /* SMP */ static void __init print_APIC_field(int base) { int i; printk(KERN_DEBUG); for (i = 0; i < 8; i++) pr_cont("%08x", apic_read(base + i*0x10)); pr_cont("\n"); } static void __init print_local_APIC(void *dummy) { unsigned int i, v, ver, maxlvt; u64 icr; pr_debug("printing local APIC contents on CPU#%d/%d:\n", smp_processor_id(), hard_smp_processor_id()); v = apic_read(APIC_ID); pr_info("... APIC ID: %08x (%01x)\n", v, read_apic_id()); v = apic_read(APIC_LVR); pr_info("... APIC VERSION: %08x\n", v); ver = GET_APIC_VERSION(v); maxlvt = lapic_get_maxlvt(); v = apic_read(APIC_TASKPRI); pr_debug("... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK); /* !82489DX */ if (APIC_INTEGRATED(ver)) { if (!APIC_XAPIC(ver)) { v = apic_read(APIC_ARBPRI); pr_debug("... APIC ARBPRI: %08x (%02x)\n", v, v & APIC_ARBPRI_MASK); } v = apic_read(APIC_PROCPRI); pr_debug("... APIC PROCPRI: %08x\n", v); } /* * Remote read supported only in the 82489DX and local APIC for * Pentium processors. */ if (!APIC_INTEGRATED(ver) || maxlvt == 3) { v = apic_read(APIC_RRR); pr_debug("... APIC RRR: %08x\n", v); } v = apic_read(APIC_LDR); pr_debug("... APIC LDR: %08x\n", v); if (!x2apic_enabled()) { v = apic_read(APIC_DFR); pr_debug("... APIC DFR: %08x\n", v); } v = apic_read(APIC_SPIV); pr_debug("... APIC SPIV: %08x\n", v); pr_debug("... APIC ISR field:\n"); print_APIC_field(APIC_ISR); pr_debug("... APIC TMR field:\n"); print_APIC_field(APIC_TMR); pr_debug("... APIC IRR field:\n"); print_APIC_field(APIC_IRR); /* !82489DX */ if (APIC_INTEGRATED(ver)) { /* Due to the Pentium erratum 3AP. */ if (maxlvt > 3) apic_write(APIC_ESR, 0); v = apic_read(APIC_ESR); pr_debug("... APIC ESR: %08x\n", v); } icr = apic_icr_read(); pr_debug("... APIC ICR: %08x\n", (u32)icr); pr_debug("... APIC ICR2: %08x\n", (u32)(icr >> 32)); v = apic_read(APIC_LVTT); pr_debug("... APIC LVTT: %08x\n", v); if (maxlvt > 3) { /* PC is LVT#4. */ v = apic_read(APIC_LVTPC); pr_debug("... APIC LVTPC: %08x\n", v); } v = apic_read(APIC_LVT0); pr_debug("... APIC LVT0: %08x\n", v); v = apic_read(APIC_LVT1); pr_debug("... APIC LVT1: %08x\n", v); if (maxlvt > 2) { /* ERR is LVT#3. */ v = apic_read(APIC_LVTERR); pr_debug("... APIC LVTERR: %08x\n", v); } v = apic_read(APIC_TMICT); pr_debug("... APIC TMICT: %08x\n", v); v = apic_read(APIC_TMCCT); pr_debug("... APIC TMCCT: %08x\n", v); v = apic_read(APIC_TDCR); pr_debug("... APIC TDCR: %08x\n", v); if (boot_cpu_has(X86_FEATURE_EXTAPIC)) { v = apic_read(APIC_EFEAT); maxlvt = (v >> 16) & 0xff; pr_debug("... APIC EFEAT: %08x\n", v); v = apic_read(APIC_ECTRL); pr_debug("... APIC ECTRL: %08x\n", v); for (i = 0; i < maxlvt; i++) { v = apic_read(APIC_EILVTn(i)); pr_debug("... APIC EILVT%d: %08x\n", i, v); } } pr_cont("\n"); } static void __init print_local_APICs(int maxcpu) { int cpu; if (!maxcpu) return; preempt_disable(); for_each_online_cpu(cpu) { if (cpu >= maxcpu) break; smp_call_function_single(cpu, print_local_APIC, NULL, 1); } preempt_enable(); } static void __init print_PIC(void) { unsigned int v; unsigned long flags; if (!nr_legacy_irqs()) return; pr_debug("\nprinting PIC contents\n"); raw_spin_lock_irqsave(&i8259A_lock, flags); v = inb(0xa1) << 8 | inb(0x21); pr_debug("... PIC IMR: %04x\n", v); v = inb(0xa0) << 8 | inb(0x20); pr_debug("... PIC IRR: %04x\n", v); outb(0x0b, 0xa0); outb(0x0b, 0x20); v = inb(0xa0) << 8 | inb(0x20); outb(0x0a, 0xa0); outb(0x0a, 0x20); raw_spin_unlock_irqrestore(&i8259A_lock, flags); pr_debug("... PIC ISR: %04x\n", v); v = inb(0x4d1) << 8 | inb(0x4d0); pr_debug("... PIC ELCR: %04x\n", v); } static int show_lapic __initdata = 1; static __init int setup_show_lapic(char *arg) { int num = -1; if (strcmp(arg, "all") == 0) { show_lapic = CONFIG_NR_CPUS; } else { get_option(&arg, &num); if (num >= 0) show_lapic = num; } return 1; } __setup("show_lapic=", setup_show_lapic); static int __init print_ICs(void) { if (apic_verbosity == APIC_QUIET) return 0; print_PIC(); /* don't print out if apic is not there */ if (!boot_cpu_has(X86_FEATURE_APIC) && !apic_from_smp_config()) return 0; print_local_APICs(show_lapic); print_IO_APICs(); return 0; } late_initcall(print_ICs);
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