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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>
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
View File

@ -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;

19
drivers/pci/quirks.c
View File

@ -3610,10 +3610,8 @@ int pci_dev_specific_reset(struct pci_dev *dev, int probe)
static void quirk_dma_func0_alias(struct pci_dev *dev)
{
if (PCI_FUNC(dev->devfn) != 0) {
dev->dma_alias_devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0);
dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
}
if (PCI_FUNC(dev->devfn) != 0)
pci_add_dma_alias(dev, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
}
/*
@ -3626,10 +3624,8 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_RICOH, 0xe476, quirk_dma_func0_alias);
static void quirk_dma_func1_alias(struct pci_dev *dev)
{
if (PCI_FUNC(dev->devfn) != 1) {
dev->dma_alias_devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 1);
dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
}
if (PCI_FUNC(dev->devfn) != 1)
pci_add_dma_alias(dev, PCI_DEVFN(PCI_SLOT(dev->devfn), 1));
}
/*
@ -3696,11 +3692,10 @@ static void quirk_fixed_dma_alias(struct pci_dev *dev)
id = pci_match_id(fixed_dma_alias_tbl, dev);
if (id) {
dev->dma_alias_devfn = id->driver_data;
dev->dev_flags |= PCI_DEV_FLAGS_DMA_ALIAS_DEVFN;
pci_add_dma_alias(dev, id->driver_data);
dev_info(&dev->dev, "Enabling fixed DMA alias to %02x.%d\n",
PCI_SLOT(dev->dma_alias_devfn),
PCI_FUNC(dev->dma_alias_devfn));
PCI_SLOT(id->driver_data),
PCI_FUNC(id->driver_data));
}
}

1
include/linux/pci.h
View File

@ -1988,6 +1988,7 @@ static inline struct eeh_dev *pci_dev_to_eeh_dev(struct pci_dev *pdev)
}
#endif
void pci_add_dma_alias(struct pci_dev *dev, u8 devfn);
int pci_for_each_dma_alias(struct pci_dev *pdev,
int (*fn)(struct pci_dev *pdev,
u16 alias, void *data), void *data);