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PCI: Introduce pci_real_dma_dev()

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The current DMA alias implementation requires the aliased device be on the
same PCI bus as the requester ID.  Add an arch-specific mechanism to point
to another PCI device when doing mapping and PCI DMA alias search.  The
default case returns the actual device.

Link: https://lore.kernel.org/r/1579613871-301529-4-git-send-email-jonathan.derrick@intel.com
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jon Derrick
2020-01-21 06:37:47 -07:00
committed by Bjorn Helgaas
parent 34067c56fa
commit 2856ba6020
4 changed files with 35 additions and 1 deletions
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10
arch/x86/pci/common.c
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@@ -736,3 +736,13 @@ int pci_ext_cfg_avail(void)
else
return 0;
}
#if IS_ENABLED(CONFIG_VMD)
struct pci_dev *pci_real_dma_dev(struct pci_dev *dev)
{
if (is_vmd(dev->bus))
return to_pci_sysdata(dev->bus)->vmd_dev;
return dev;
}
#endif