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![Paul Mackerras](/assets/img/avatar_default.png)
This moves the functions kvm_irq_has_notifier(), kvm_notify_acked_irq(), kvm_register_irq_ack_notifier() and kvm_unregister_irq_ack_notifier() from irqchip.c to eventfd.c. The reason for doing this is that those functions are used in connection with IRQFDs, which are implemented in eventfd.c. In future we will want to use IRQFDs on platforms that don't implement the GSI routing implemented in irqchip.c, so we won't be compiling in irqchip.c, but we still need the irq notifiers. The implementation is unchanged. Signed-off-by: Paul Mackerras <paulus@samba.org> Tested-by: Eric Auger <eric.auger@linaro.org> Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
214 lines
5.4 KiB
C
214 lines
5.4 KiB
C
/*
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* irqchip.c: Common API for in kernel interrupt controllers
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* Copyright (c) 2007, Intel Corporation.
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* Copyright 2010 Red Hat, Inc. and/or its affiliates.
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* Copyright (c) 2013, Alexander Graf <agraf@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* This file is derived from virt/kvm/irq_comm.c.
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*
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* Authors:
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* Yaozu (Eddie) Dong <Eddie.dong@intel.com>
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* Alexander Graf <agraf@suse.de>
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*/
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#include <linux/kvm_host.h>
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#include <linux/slab.h>
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#include <linux/srcu.h>
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#include <linux/export.h>
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#include <trace/events/kvm.h>
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#include "irq.h"
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struct kvm_irq_routing_table {
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int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
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struct kvm_kernel_irq_routing_entry *rt_entries;
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u32 nr_rt_entries;
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/*
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* Array indexed by gsi. Each entry contains list of irq chips
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* the gsi is connected to.
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*/
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struct hlist_head map[0];
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};
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int kvm_irq_map_gsi(struct kvm *kvm,
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struct kvm_kernel_irq_routing_entry *entries, int gsi)
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{
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struct kvm_irq_routing_table *irq_rt;
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struct kvm_kernel_irq_routing_entry *e;
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int n = 0;
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irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
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lockdep_is_held(&kvm->irq_lock));
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if (gsi < irq_rt->nr_rt_entries) {
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hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
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entries[n] = *e;
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++n;
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}
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}
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return n;
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}
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int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
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{
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struct kvm_irq_routing_table *irq_rt;
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irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
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return irq_rt->chip[irqchip][pin];
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}
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int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
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{
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struct kvm_kernel_irq_routing_entry route;
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if (!irqchip_in_kernel(kvm) || msi->flags != 0)
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return -EINVAL;
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route.msi.address_lo = msi->address_lo;
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route.msi.address_hi = msi->address_hi;
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route.msi.data = msi->data;
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return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false);
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}
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/*
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* Return value:
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* < 0 Interrupt was ignored (masked or not delivered for other reasons)
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* = 0 Interrupt was coalesced (previous irq is still pending)
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* > 0 Number of CPUs interrupt was delivered to
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*/
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int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
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bool line_status)
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{
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struct kvm_kernel_irq_routing_entry irq_set[KVM_NR_IRQCHIPS];
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int ret = -1, i, idx;
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trace_kvm_set_irq(irq, level, irq_source_id);
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/* Not possible to detect if the guest uses the PIC or the
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* IOAPIC. So set the bit in both. The guest will ignore
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* writes to the unused one.
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*/
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idx = srcu_read_lock(&kvm->irq_srcu);
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i = kvm_irq_map_gsi(kvm, irq_set, irq);
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srcu_read_unlock(&kvm->irq_srcu, idx);
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while(i--) {
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int r;
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r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level,
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line_status);
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if (r < 0)
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continue;
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ret = r + ((ret < 0) ? 0 : ret);
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}
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return ret;
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}
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void kvm_free_irq_routing(struct kvm *kvm)
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{
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/* Called only during vm destruction. Nobody can use the pointer
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at this stage */
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kfree(kvm->irq_routing);
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}
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static int setup_routing_entry(struct kvm_irq_routing_table *rt,
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struct kvm_kernel_irq_routing_entry *e,
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const struct kvm_irq_routing_entry *ue)
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{
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int r = -EINVAL;
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struct kvm_kernel_irq_routing_entry *ei;
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/*
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* Do not allow GSI to be mapped to the same irqchip more than once.
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* Allow only one to one mapping between GSI and MSI.
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*/
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hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
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if (ei->type == KVM_IRQ_ROUTING_MSI ||
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ue->type == KVM_IRQ_ROUTING_MSI ||
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ue->u.irqchip.irqchip == ei->irqchip.irqchip)
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return r;
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e->gsi = ue->gsi;
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e->type = ue->type;
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r = kvm_set_routing_entry(e, ue);
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if (r)
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goto out;
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if (e->type == KVM_IRQ_ROUTING_IRQCHIP)
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rt->chip[e->irqchip.irqchip][e->irqchip.pin] = e->gsi;
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hlist_add_head(&e->link, &rt->map[e->gsi]);
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r = 0;
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out:
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return r;
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}
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int kvm_set_irq_routing(struct kvm *kvm,
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const struct kvm_irq_routing_entry *ue,
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unsigned nr,
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unsigned flags)
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{
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struct kvm_irq_routing_table *new, *old;
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u32 i, j, nr_rt_entries = 0;
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int r;
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for (i = 0; i < nr; ++i) {
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if (ue[i].gsi >= KVM_MAX_IRQ_ROUTES)
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return -EINVAL;
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nr_rt_entries = max(nr_rt_entries, ue[i].gsi);
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}
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nr_rt_entries += 1;
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new = kzalloc(sizeof(*new) + (nr_rt_entries * sizeof(struct hlist_head))
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+ (nr * sizeof(struct kvm_kernel_irq_routing_entry)),
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GFP_KERNEL);
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if (!new)
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return -ENOMEM;
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new->rt_entries = (void *)&new->map[nr_rt_entries];
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new->nr_rt_entries = nr_rt_entries;
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for (i = 0; i < KVM_NR_IRQCHIPS; i++)
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for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
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new->chip[i][j] = -1;
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for (i = 0; i < nr; ++i) {
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r = -EINVAL;
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if (ue->flags)
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goto out;
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r = setup_routing_entry(new, &new->rt_entries[i], ue);
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if (r)
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goto out;
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++ue;
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}
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mutex_lock(&kvm->irq_lock);
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old = kvm->irq_routing;
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rcu_assign_pointer(kvm->irq_routing, new);
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kvm_irq_routing_update(kvm);
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mutex_unlock(&kvm->irq_lock);
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synchronize_srcu_expedited(&kvm->irq_srcu);
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new = old;
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r = 0;
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out:
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kfree(new);
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return r;
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}
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