diff options
| author | Alex Williamson <alex.williamson@redhat.com> | 2014-05-22 17:07:43 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-05-28 15:20:31 -0600 |
| commit | 31c2b8153c58f11ddb80dfd392c16f13c2d709c6 (patch) | |
| tree | 7ceb946ee75079ed1552f9a60e471a97bb3fa72b /drivers/pci | |
| parent | 6b121592f8a3fd2bd0de128637b76a0d0864d993 (diff) | |
PCI: Add support for DMA alias quirks
Some devices are broken and use a requester ID other than their physical
devfn. Add a byte, using an existing gap in the pci_dev structure, to
store an alternate "alias" devfn. A bit in the dev_flags tells us when
this is valid. We then add the alias as one more step in the
pci_for_each_dma_alias() iterator.
Tested-by: George Spelvin <linux@horizon.com>
Tested-by: Pat Erley <pat-lkml@erley.org>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/search.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/pci/search.c b/drivers/pci/search.c index 5601cdb8bbb..2c19f3f4062 100644 --- a/drivers/pci/search.c +++ b/drivers/pci/search.c @@ -37,6 +37,17 @@ int pci_for_each_dma_alias(struct pci_dev *pdev, if (ret) return ret; + /* + * If the device is broken and uses an alias requester ID for + * DMA, iterate over that too. + */ + if (unlikely(pdev->dev_flags & PCI_DEV_FLAGS_DMA_ALIAS_DEVFN)) { + ret = fn(pdev, PCI_DEVID(pdev->bus->number, + pdev->dma_alias_devfn), data); + if (ret) + return ret; + } + for (bus = pdev->bus; !pci_is_root_bus(bus); bus = bus->parent) { struct pci_dev *tmp; |