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xen: events: separate MSI PIRQ allocation from PIRQ binding to IRQ

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Split the binding aspect of xen_allocate_pirq_msi out into a new
xen_bind_pirq_to_irq function.

In xen_hvm_setup_msi_irq when allocating a pirq write the MSI message
to signal the PIRQ as soon as the pirq is obtained. There is no way to
free the pirq back so if the subsequent binding to an IRQ fails we
want to ensure that we will reuse the PIRQ next time rather than leak
it.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Ian Campbell
2011-02-18 16:43:32 +00:00
committed by Konrad Rzeszutek Wilk
parent 5cad61a6ba
commit bf480d952b
3 changed files with 43 additions and 59 deletions
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4
include/xen/events.h
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@@ -75,7 +75,9 @@ int xen_allocate_pirq(unsigned gsi, int shareable, char *name);
int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name);
#ifdef CONFIG_PCI_MSI
int xen_allocate_pirq_msi(char *name, int *pirq, int alloc_pirq);
int xen_allocate_pirq_msi(struct pci_dev *dev, struct msi_desc *msidesc);
int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
int pirq, const char *name);
int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type);
#endif