/* * irq_comm.c: Common API for in kernel interrupt controller * Copyright (c) 2007, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 Temple * Place - Suite 330, Boston, MA 02111-1307 USA. * Authors: * Yaozu (Eddie) Dong <Eddie.dong@intel.com> * * Copyright 2010 Red Hat, Inc. and/or its affiliates. */ #include <linux/kvm_host.h> #include <linux/slab.h> #include <trace/events/kvm.h> #include <asm/msidef.h> #ifdef CONFIG_IA64 #include <asm/iosapic.h> #endif #include "irq.h" #include "ioapic.h" static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level) { #ifdef CONFIG_X86 struct kvm_pic *pic = pic_irqchip(kvm); return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level); #else return -1; #endif } static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level) { struct kvm_ioapic *ioapic = kvm->arch.vioapic; return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level); } inline static bool kvm_is_dm_lowest_prio(struct kvm_lapic_irq *irq) { #ifdef CONFIG_IA64 return irq->delivery_mode == (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT); #else return irq->delivery_mode == APIC_DM_LOWEST; #endif } int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src, struct kvm_lapic_irq *irq) { int i, r = -1; struct kvm_vcpu *vcpu, *lowest = NULL; if (irq->dest_mode == 0 && irq->dest_id == 0xff && kvm_is_dm_lowest_prio(irq)) { printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n"); irq->delivery_mode = APIC_DM_FIXED; } if (kvm_irq_delivery_to_apic_fast(kvm, src, irq, &r)) return r; kvm_for_each_vcpu(i, vcpu, kvm) { if (!kvm_apic_present(vcpu)) continue; if (!kvm_apic_match_dest(vcpu, src, irq->shorthand, irq->dest_id, irq->dest_mode)) continue; if (!kvm_is_dm_lowest_prio(irq)) { if (r < 0) r = 0; r += kvm_apic_set_irq(vcpu, irq); } else if (kvm_lapic_enabled(vcpu)) { if (!lowest) lowest = vcpu; else if (kvm_apic_compare_prio(vcpu, lowest) < 0) lowest = vcpu; } } if (lowest) r = kvm_apic_set_irq(lowest, irq); return r; } static inline void kvm_set_msi_irq(struct kvm_kernel_irq_routing_entry *e, struct kvm_lapic_irq *irq) { trace_kvm_msi_set_irq(e->msi.address_lo, e->msi.data); irq->dest_id = (e->msi.address_lo & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT; irq->vector = (e->msi.data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT; irq->dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo; irq->trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data; irq->delivery_mode = e->msi.data & 0x700; irq->level = 1; irq->shorthand = 0; /* TODO Deal with RH bit of MSI message address */ } int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, int irq_source_id, int level) { struct kvm_lapic_irq irq; if (!level) return -1; kvm_set_msi_irq(e, &irq); return kvm_irq_delivery_to_apic(kvm, NULL, &irq); } static int kvm_set_msi_inatomic(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm) { struct kvm_lapic_irq irq; int r; kvm_set_msi_irq(e, &irq); if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r)) return r; else return -EWOULDBLOCK; } int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi) { struct kvm_kernel_irq_routing_entry route; if (!irqchip_in_kernel(kvm) || msi->flags != 0) return -EINVAL; route.msi.address_lo = msi->address_lo; route.msi.address_hi = msi->address_hi; route.msi.data = msi->data; return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1); } /* * Return value: * < 0 Interrupt was ignored (masked or not delivered for other reasons) * = 0 Interrupt was coalesced (previous irq is still pending) * > 0 Number of CPUs interrupt was delivered to */ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level) { struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS]; int ret = -1, i = 0; struct kvm_irq_routing_table *irq_rt; struct hlist_node *n; trace_kvm_set_irq(irq, level, irq_source_id); /* Not possible to detect if the guest uses the PIC or the * IOAPIC. So set the bit in both. The guest will ignore * writes to the unused one. */ rcu_read_lock(); irq_rt = rcu_dereference(kvm->irq_routing); if (irq < irq_rt->nr_rt_entries) hlist_for_each_entry(e, n, &irq_rt->map[irq], link) irq_set[i++] = *e; rcu_read_unlock(); while(i--) { int r; r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level); if (r < 0) continue; ret = r + ((ret < 0) ? 0 : ret); } return ret; } /* * Deliver an IRQ in an atomic context if we can, or return a failure, * user can retry in a process context. * Return value: * -EWOULDBLOCK - Can't deliver in atomic context: retry in a process context. * Other values - No need to retry. */ int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level) { struct kvm_kernel_irq_routing_entry *e; int ret = -EINVAL; struct kvm_irq_routing_table *irq_rt; struct hlist_node *n; trace_kvm_set_irq(irq, level, irq_source_id); /* * Injection into either PIC or IOAPIC might need to scan all CPUs, * which would need to be retried from thread context; when same GSI * is connected to both PIC and IOAPIC, we'd have to report a * partial failure here. * Since there's no easy way to do this, we only support injecting MSI * which is limited to 1:1 GSI mapping. */ rcu_read_lock(); irq_rt = rcu_dereference(kvm->irq_routing); if (irq < irq_rt->nr_rt_entries) hlist_for_each_entry(e, n, &irq_rt->map[irq], link) { if (likely(e->type == KVM_IRQ_ROUTING_MSI)) ret = kvm_set_msi_inatomic(e, kvm); else ret = -EWOULDBLOCK; break; } rcu_read_unlock(); return ret; } void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) { struct kvm_irq_ack_notifier *kian; struct hlist_node *n; int gsi; trace_kvm_ack_irq(irqchip, pin); rcu_read_lock(); gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin]; if (gsi != -1) hlist_for_each_entry_rcu(kian, n, &kvm->irq_ack_notifier_list, link) if (kian->gsi == gsi) kian->irq_acked(kian); rcu_read_unlock(); } void kvm_register_irq_ack_notifier(struct kvm *kvm, struct kvm_irq_ack_notifier *kian) { mutex_lock(&kvm->irq_lock); hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list); mutex_unlock(&kvm->irq_lock); } void kvm_unregister_irq_ack_notifier(struct kvm *kvm, struct kvm_irq_ack_notifier *kian) { mutex_lock(&kvm->irq_lock); hlist_del_init_rcu(&kian->link); mutex_unlock(&kvm->irq_lock); synchronize_rcu(); } int kvm_request_irq_source_id(struct kvm *kvm) { unsigned long *bitmap = &kvm->arch.irq_sources_bitmap; int irq_source_id; mutex_lock(&kvm->irq_lock); irq_source_id = find_first_zero_bit(bitmap, BITS_PER_LONG); if (irq_source_id >= BITS_PER_LONG) { printk(KERN_WARNING "kvm: exhaust allocatable IRQ sources!\n"); irq_source_id = -EFAULT; goto unlock; } ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); #ifdef CONFIG_X86 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); #endif set_bit(irq_source_id, bitmap); unlock: mutex_unlock(&kvm->irq_lock); return irq_source_id; } void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id) { ASSERT(irq_source_id != KVM_USERSPACE_IRQ_SOURCE_ID); #ifdef CONFIG_X86 ASSERT(irq_source_id != KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID); #endif mutex_lock(&kvm->irq_lock); if (irq_source_id < 0 || irq_source_id >= BITS_PER_LONG) { printk(KERN_ERR "kvm: IRQ source ID out of range!\n"); goto unlock; } clear_bit(irq_source_id, &kvm->arch.irq_sources_bitmap); if (!irqchip_in_kernel(kvm)) goto unlock; kvm_ioapic_clear_all(kvm->arch.vioapic, irq_source_id); #ifdef CONFIG_X86 kvm_pic_clear_all(pic_irqchip(kvm), irq_source_id); #endif unlock: mutex_unlock(&kvm->irq_lock); } void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq, struct kvm_irq_mask_notifier *kimn) { mutex_lock(&kvm->irq_lock); kimn->irq = irq; hlist_add_head_rcu(&kimn->link, &kvm->mask_notifier_list); mutex_unlock(&kvm->irq_lock); } void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq, struct kvm_irq_mask_notifier *kimn) { mutex_lock(&kvm->irq_lock); hlist_del_rcu(&kimn->link); mutex_unlock(&kvm->irq_lock); synchronize_rcu(); } void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin, bool mask) { struct kvm_irq_mask_notifier *kimn; struct hlist_node *n; int gsi; rcu_read_lock(); gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin]; if (gsi != -1) hlist_for_each_entry_rcu(kimn, n, &kvm->mask_notifier_list, link) if (kimn->irq == gsi) kimn->func(kimn, mask); rcu_read_unlock(); } void kvm_free_irq_routing(struct kvm *kvm) { /* Called only during vm destruction. Nobody can use the pointer at this stage */ kfree(kvm->irq_routing); } static int setup_routing_entry(struct kvm_irq_routing_table *rt, struct kvm_kernel_irq_routing_entry *e, const struct kvm_irq_routing_entry *ue) { int r = -EINVAL; int delta; unsigned max_pin; struct kvm_kernel_irq_routing_entry *ei; struct hlist_node *n; /* * Do not allow GSI to be mapped to the same irqchip more than once. * Allow only one to one mapping between GSI and MSI. */ hlist_for_each_entry(ei, n, &rt->map[ue->gsi], link) if (ei->type == KVM_IRQ_ROUTING_MSI || ue->type == KVM_IRQ_ROUTING_MSI || ue->u.irqchip.irqchip == ei->irqchip.irqchip) return r; e->gsi = ue->gsi; e->type = ue->type; switch (ue->type) { case KVM_IRQ_ROUTING_IRQCHIP: delta = 0; switch (ue->u.irqchip.irqchip) { case KVM_IRQCHIP_PIC_MASTER: e->set = kvm_set_pic_irq; max_pin = PIC_NUM_PINS; break; case KVM_IRQCHIP_PIC_SLAVE: e->set = kvm_set_pic_irq; max_pin = PIC_NUM_PINS; delta = 8; break; case KVM_IRQCHIP_IOAPIC: max_pin = KVM_IOAPIC_NUM_PINS; e->set = kvm_set_ioapic_irq; break; default: goto out; } e->irqchip.irqchip = ue->u.irqchip.irqchip; e->irqchip.pin = ue->u.irqchip.pin + delta; if (e->irqchip.pin >= max_pin) goto out; rt->chip[ue->u.irqchip.irqchip][e->irqchip.pin] = ue->gsi; break; case KVM_IRQ_ROUTING_MSI: e->set = kvm_set_msi; e->msi.address_lo = ue->u.msi.address_lo; e->msi.address_hi = ue->u.msi.address_hi; e->msi.data = ue->u.msi.data; break; default: goto out; } hlist_add_head(&e->link, &rt->map[e->gsi]); r = 0; out: return r; } int kvm_set_irq_routing(struct kvm *kvm, const struct kvm_irq_routing_entry *ue, unsigned nr, unsigned flags) { struct kvm_irq_routing_table *new, *old; u32 i, j, nr_rt_entries = 0; int r; for (i = 0; i < nr; ++i) { if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES) return -EINVAL; nr_rt_entries = max(nr_rt_entries, ue[i].gsi); } nr_rt_entries += 1; new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head)) + (nr * sizeof(struct kvm_kernel_irq_routing_entry)), GFP_KERNEL); if (!new) return -ENOMEM; new->rt_entries = (void *)&new->map[nr_rt_entries]; new->nr_rt_entries = nr_rt_entries; for (i = 0; i < 3; i++) for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++) new->chip[i][j] = -1; for (i = 0; i < nr; ++i) { r = -EINVAL; if (ue->flags) goto out; r = setup_routing_entry(new, &new->rt_entries[i], ue); if (r) goto out; ++ue; } mutex_lock(&kvm->irq_lock); old = kvm->irq_routing; kvm_irq_routing_update(kvm, new); mutex_unlock(&kvm->irq_lock); synchronize_rcu(); new = old; r = 0; out: kfree(new); return r; } #define IOAPIC_ROUTING_ENTRY(irq) \ { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ .u.irqchip.irqchip = KVM_IRQCHIP_IOAPIC, .u.irqchip.pin = (irq) } #define ROUTING_ENTRY1(irq) IOAPIC_ROUTING_ENTRY(irq) #ifdef CONFIG_X86 # define PIC_ROUTING_ENTRY(irq) \ { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ .u.irqchip.irqchip = SELECT_PIC(irq), .u.irqchip.pin = (irq) % 8 } # define ROUTING_ENTRY2(irq) \ IOAPIC_ROUTING_ENTRY(irq), PIC_ROUTING_ENTRY(irq) #else # define ROUTING_ENTRY2(irq) \ IOAPIC_ROUTING_ENTRY(irq) #endif static const struct kvm_irq_routing_entry default_routing[] = { ROUTING_ENTRY2(0), ROUTING_ENTRY2(1), ROUTING_ENTRY2(2), ROUTING_ENTRY2(3), ROUTING_ENTRY2(4), ROUTING_ENTRY2(5), ROUTING_ENTRY2(6), ROUTING_ENTRY2(7), ROUTING_ENTRY2(8), ROUTING_ENTRY2(9), ROUTING_ENTRY2(10), ROUTING_ENTRY2(11), ROUTING_ENTRY2(12), ROUTING_ENTRY2(13), ROUTING_ENTRY2(14), ROUTING_ENTRY2(15), ROUTING_ENTRY1(16), ROUTING_ENTRY1(17), ROUTING_ENTRY1(18), ROUTING_ENTRY1(19), ROUTING_ENTRY1(20), ROUTING_ENTRY1(21), ROUTING_ENTRY1(22), ROUTING_ENTRY1(23), #ifdef CONFIG_IA64 ROUTING_ENTRY1(24), ROUTING_ENTRY1(25), ROUTING_ENTRY1(26), ROUTING_ENTRY1(27), ROUTING_ENTRY1(28), ROUTING_ENTRY1(29), ROUTING_ENTRY1(30), ROUTING_ENTRY1(31), ROUTING_ENTRY1(32), ROUTING_ENTRY1(33), ROUTING_ENTRY1(34), ROUTING_ENTRY1(35), ROUTING_ENTRY1(36), ROUTING_ENTRY1(37), ROUTING_ENTRY1(38), ROUTING_ENTRY1(39), ROUTING_ENTRY1(40), ROUTING_ENTRY1(41), ROUTING_ENTRY1(42), ROUTING_ENTRY1(43), ROUTING_ENTRY1(44), ROUTING_ENTRY1(45), ROUTING_ENTRY1(46), ROUTING_ENTRY1(47), #endif }; int kvm_setup_default_irq_routing(struct kvm *kvm) { return kvm_set_irq_routing(kvm, default_routing, ARRAY_SIZE(default_routing), 0); }