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x86/PCI: Allow DMA ops specific to a PCI domain

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The Intel Volume Management Device (VMD) is a PCIe endpoint that acts as a
host bridge to another PCI domain.  When devices below the VMD perform DMA,
the VMD replaces their DMA source IDs with its own source ID.  Therefore,
those devices require special DMA ops.

Add interfaces to allow the VMD driver to set up dma_ops for the devices
below it.

[bhelgaas: remove "extern", add "static", changelog]
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Keith Busch
2016-01-12 13:18:08 -07:00
committed by Bjorn Helgaas
parent 64bce3e8bf
commit d9c3d6ff22
2 changed files with 48 additions and 0 deletions
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arch/x86/include/asm/device.h
+10
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@@ -10,6 +10,16 @@ struct dev_archdata {
#endif
};
#if defined(CONFIG_X86_DEV_DMA_OPS) && defined(CONFIG_PCI_DOMAINS)
struct dma_domain {
struct list_head node;
struct dma_map_ops *dma_ops;
int domain_nr;
};
void add_dma_domain(struct dma_domain *domain);
void del_dma_domain(struct dma_domain *domain);
#endif
struct pdev_archdata {
};