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authorBjorn Helgaas <bhelgaas@google.com>2016-02-24 13:43:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2016-04-11 14:08:06 -0500
commitf0af9593372abfde34460aa1250e670cc535a7d8 (patch)
tree4f4914feebc665fd48149052ba07a8c50bc69791 /drivers/pci/pci.c
parent9735a22799b9214d17d3c231fe377fc852f042e9 (diff)
PCI: Add pci_add_dma_alias() to abstract implementation
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>
Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 25e0327d4429..1162118d1093 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -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;