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

[Rolf Eike Beer <eike-kernel@xxxxxxxxx>]

Leon Woestenberg wrote:
> 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)?

Create a pci_pool (see pci_pool_*() in include/linux/pci.h) for the 
descriptors. Create the pool with a restriction to 32 bit.

Eike

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