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PCI/MSI: Add pci_msi_vec_count()

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Device drivers can use this interface to obtain the maximum number of MSI
interrupts the device supports and use that number, e.g., in a subsequent
call to pci_enable_msi_block().

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Alexander Gordeev 2013-12-30 08:28:13 +01:00 • committed by Bjorn Helgaas
parent 52179dc9ed
commit d1ac1d2622
3 changed files with 54 additions and 8 deletions
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6
include/linux/pci.h
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@ -1154,6 +1154,11 @@ struct msix_entry {
#ifndef CONFIG_PCI_MSI
static inline int pci_msi_vec_count(struct pci_dev *dev)
{
return -ENOSYS;
}
static inline int pci_enable_msi_block(struct pci_dev *dev, int nvec)
{
return -ENOSYS;
@ -1195,6 +1200,7 @@ static inline int pci_msi_enabled(void)
return 0;
}
#else
int pci_msi_vec_count(struct pci_dev *dev);
int pci_enable_msi_block(struct pci_dev *dev, int nvec);
int pci_enable_msi_block_auto(struct pci_dev *dev, int *maxvec);
void pci_msi_shutdown(struct pci_dev *dev);