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Revert "virtio-pci: harden INTX interrupts"

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commit 7b79edfb86 upstream.

This reverts commit 080cd7c3ac. Since
the MSI-X interrupts hardening will be reverted in the next patch. We
will rework the interrupt hardening in the future.

Fixes: 080cd7c3ac ("virtio-pci: harden INTX interrupts")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20220323031524.6555-1-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason Wang 2022-03-23 11:15:23 +08:00 committed by Greg Kroah-Hartman
parent 9c2463490b
commit caa71784e7
2 changed files with 2 additions and 22 deletions
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23
drivers/virtio/virtio_pci_common.c
View file

@ -30,16 +30,8 @@ void vp_disable_cbs(struct virtio_device *vdev)
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
if (vp_dev->intx_enabled) {
/*
* The below synchronize() guarantees that any
* interrupt for this line arriving after
* synchronize_irq() has completed is guaranteed to see
* intx_soft_enabled == false.
*/
WRITE_ONCE(vp_dev->intx_soft_enabled, false);
if (vp_dev->intx_enabled)
synchronize_irq(vp_dev->pci_dev->irq);
}
for (i = 0; i < vp_dev->msix_vectors; ++i)
disable_irq(pci_irq_vector(vp_dev->pci_dev, i));
@ -51,16 +43,8 @@ void vp_enable_cbs(struct virtio_device *vdev)
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
if (vp_dev->intx_enabled) {
disable_irq(vp_dev->pci_dev->irq);
/*
* The above disable_irq() provides TSO ordering and
* as such promotes the below store to store-release.
*/
WRITE_ONCE(vp_dev->intx_soft_enabled, true);
enable_irq(vp_dev->pci_dev->irq);
if (vp_dev->intx_enabled)
return;
}
for (i = 0; i < vp_dev->msix_vectors; ++i)
enable_irq(pci_irq_vector(vp_dev->pci_dev, i));
@ -113,9 +97,6 @@ static irqreturn_t vp_interrupt(int irq, void *opaque)
struct virtio_pci_device *vp_dev = opaque;
u8 isr;
if (!READ_ONCE(vp_dev->intx_soft_enabled))
return IRQ_NONE;
/* reading the ISR has the effect of also clearing it so it's very
* important to save off the value. */
isr = ioread8(vp_dev->isr);

1
drivers/virtio/virtio_pci_common.h
View file

@ -63,7 +63,6 @@ struct virtio_pci_device {
/* MSI-X support */
int msix_enabled;
int intx_enabled;
bool intx_soft_enabled;
cpumask_var_t *msix_affinity_masks;
/* Name strings for interrupts. This size should be enough,
* and I'm too lazy to allocate each name separately. */