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xen: handled remapped IRQs when enabling a pcifront PCI device.

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This happens to not be an issue currently because we take pains to try
to ensure that the GSI-IRQ mapping is 1-1 in a PV guest and that
regular event channels do not clash. However a subsequent patch is
going to break this 1-1 mapping.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
This commit is contained in:
Ian Campbell 2011-01-11 17:20:13 +00:00 committed by Konrad Rzeszutek Wilk
parent 100b33c8bd
commit 3f2a230caf
1 changed files with 17 additions and 11 deletions
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28
arch/x86/pci/xen.c
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@ -226,21 +226,27 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev)
{
int rc;
int share = 1;
u8 gsi;
dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
if (dev->irq < 0)
return -EINVAL;
if (dev->irq < NR_IRQS_LEGACY)
share = 0;
rc = xen_allocate_pirq(dev->irq, share, "pcifront");
rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
if (rc < 0) {
dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
dev->irq, rc);
dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
rc);
return rc;
}
if (gsi < NR_IRQS_LEGACY)
share = 0;
rc = xen_allocate_pirq(gsi, share, "pcifront");
if (rc < 0) {
dev_warn(&dev->dev, "Xen PCI: failed to register GSI%d: %d\n",
gsi, rc);
return rc;
}
dev->irq = rc;
dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
return 0;
}