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PCI: Add pci_add_dma_alias() to abstract implementation

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Add a pci_add_dma_alias() interface to encapsulate the details of adding an
alias.  No functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Bjorn Helgaas
2016-02-24 13:43:45 -06:00
parent 9735a22799
commit f0af959337
3 changed files with 22 additions and 12 deletions
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14
drivers/pci/pci.c
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@@ -4578,6 +4578,20 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode,
return 0;
}
/**
* pci_add_dma_alias - Add a DMA devfn alias for a device
* @dev: the PCI device for which alias is added
* @devfn: alias slot and function
*
* This helper encodes 8-bit devfn as bit number in dma_alias_mask.
* It should be called early, preferably as PCI fixup header quirk.
*/
void pci_add_dma_alias(struct pci_dev *dev, u8 devfn)
{
dev->dma_alias_devfn = devfn;
dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
}
bool pci_device_is_present(struct pci_dev *pdev)
{
u32 v;