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vfio: Register/unregister irq_bypass_producer

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This patch adds the registration/unregistration of an
irq_bypass_producer for MSI/MSIx on vfio pci devices.

Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Feng Wu <feng.wu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Feng Wu 2015-09-18 22:29:50 +08:00 committed by Paolo Bonzini
parent d84f1e0755
commit 6d7425f109
4 changed files with 13 additions and 0 deletions
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1
drivers/vfio/Kconfig
View File

@ -33,3 +33,4 @@ menuconfig VFIO
source "drivers/vfio/pci/Kconfig"
source "drivers/vfio/platform/Kconfig"
source "virt/lib/Kconfig"

1
drivers/vfio/pci/Kconfig
View File

@ -2,6 +2,7 @@ config VFIO_PCI
tristate "VFIO support for PCI devices"
depends on VFIO && PCI && EVENTFD
select VFIO_VIRQFD
select IRQ_BYPASS_MANAGER
help
Support for the PCI VFIO bus driver. This is required to make
use of PCI drivers using the VFIO framework.

9
drivers/vfio/pci/vfio_pci_intrs.c
View File

@ -319,6 +319,7 @@ static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
if (vdev->ctx[vector].trigger) {
free_irq(irq, vdev->ctx[vector].trigger);
irq_bypass_unregister_producer(&vdev->ctx[vector].producer);
kfree(vdev->ctx[vector].name);
eventfd_ctx_put(vdev->ctx[vector].trigger);
vdev->ctx[vector].trigger = NULL;
@ -360,6 +361,14 @@ static int vfio_msi_set_vector_signal(struct vfio_pci_device *vdev,
return ret;
}
vdev->ctx[vector].producer.token = trigger;
vdev->ctx[vector].producer.irq = irq;
ret = irq_bypass_register_producer(&vdev->ctx[vector].producer);
if (unlikely(ret))
dev_info(&pdev->dev,
"irq bypass producer (token %p) registration fails: %d\n",
vdev->ctx[vector].producer.token, ret);
vdev->ctx[vector].trigger = trigger;
return 0;

2
drivers/vfio/pci/vfio_pci_private.h
View File

@ -13,6 +13,7 @@
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/irqbypass.h>
#ifndef VFIO_PCI_PRIVATE_H
#define VFIO_PCI_PRIVATE_H
@ -29,6 +30,7 @@ struct vfio_pci_irq_ctx {
struct virqfd *mask;
char *name;
bool masked;
struct irq_bypass_producer producer;
};
struct vfio_pci_device {