How to combine two PCIe devices in one domain?

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Hi all,

I have a driver module which would drive two PCIe devices to access a same memory area.
As the two devices are in different domains, I should map the memory to every PCIe device. And also the mapped address may be different for individual PCIe device.
How could I combine these two PCIe device in one domain so they share same address space?

Thanks.
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