Allocate consistent memory in the 32-bit address range, with DMA_64BIT_MASK?

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Hello,

my PCIe device supports 64-bit DMA for data, but only 32-bit addresses
for fetching descriptors from host memory.

How can I allocate consistent memory in the 32-bit address range, even
though I earlier performed pci_set_dma_mask(..., DMA_64BIT_MASK)?

Regards,
-- 
Leon
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