Commit e4d57e1e authored by Paul Mackerras's avatar Paul Mackerras Committed by Paolo Bonzini
Browse files

KVM: Move irq notifier implementation into eventfd.c 



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: default avatarPaul Mackerras <paulus@samba.org>
Tested-by: default avatarEric Auger <eric.auger@linaro.org>
Tested-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 9957c86d

virt/kvm/eventfd.c

+63 −0
Original line number Diff line number Diff line
@@ -34,7 +34,9 @@ 
#include <linux/srcu.h>

#include <linux/slab.h>

#include <linux/seqlock.h>

#include <trace/events/kvm.h>



#include "irq.h"

#include "iodev.h"



#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
@@ -865,3 +867,64 @@ kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args) 


	return kvm_assign_ioeventfd(kvm, args);

}



bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)

{

	struct kvm_irq_ack_notifier *kian;

	int gsi, idx;



	idx = srcu_read_lock(&kvm->irq_srcu);

	gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);

	if (gsi != -1)

		hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,

					 link)

			if (kian->gsi == gsi) {

				srcu_read_unlock(&kvm->irq_srcu, idx);

				return true;

			}



	srcu_read_unlock(&kvm->irq_srcu, idx);



	return false;

}

EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);



void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)

{

	struct kvm_irq_ack_notifier *kian;

	int gsi, idx;



	trace_kvm_ack_irq(irqchip, pin);



	idx = srcu_read_lock(&kvm->irq_srcu);

	gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);

	if (gsi != -1)

		hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,

					 link)

			if (kian->gsi == gsi)

				kian->irq_acked(kian);

	srcu_read_unlock(&kvm->irq_srcu, idx);

}



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);

#ifdef __KVM_HAVE_IOAPIC

	kvm_vcpu_request_scan_ioapic(kvm);

#endif

}



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_srcu(&kvm->irq_srcu);

#ifdef __KVM_HAVE_IOAPIC

	kvm_vcpu_request_scan_ioapic(kvm);

#endif

}

virt/kvm/irqchip.c

+0 −61
Original line number Diff line number Diff line
@@ -69,67 +69,6 @@ int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin) 
	return irq_rt->chip[irqchip][pin];

}



bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)

{

	struct kvm_irq_ack_notifier *kian;

	int gsi, idx;



	idx = srcu_read_lock(&kvm->irq_srcu);

	gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);

	if (gsi != -1)

		hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,

					 link)

			if (kian->gsi == gsi) {

				srcu_read_unlock(&kvm->irq_srcu, idx);

				return true;

			}



	srcu_read_unlock(&kvm->irq_srcu, idx);



	return false;

}

EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);



void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)

{

	struct kvm_irq_ack_notifier *kian;

	int gsi, idx;



	trace_kvm_ack_irq(irqchip, pin);



	idx = srcu_read_lock(&kvm->irq_srcu);

	gsi = kvm_irq_map_chip_pin(kvm, irqchip, pin);

	if (gsi != -1)

		hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,

					 link)

			if (kian->gsi == gsi)

				kian->irq_acked(kian);

	srcu_read_unlock(&kvm->irq_srcu, idx);

}



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);

#ifdef __KVM_HAVE_IOAPIC

	kvm_vcpu_request_scan_ioapic(kvm);

#endif

}



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_srcu(&kvm->irq_srcu);

#ifdef __KVM_HAVE_IOAPIC

	kvm_vcpu_request_scan_ioapic(kvm);

#endif

}



int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)

{

	struct kvm_kernel_irq_routing_entry route;

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