Messages in this thread | | | Date | Fri, 9 Sep 2022 06:29:50 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH v5 2/2] PCI: dwc: Add support for 64-bit MSI target address |
| |
On Thu, Aug 25, 2022 at 06:50:25PM +0000, Will McVicker wrote: > Since not all devices require a 32-bit MSI address, add support to the > PCIe host driver to allow setting the DMA mask to 64-bits if the 32-bit > allocation fails. This allows kernels to disable ZONE_DMA32 and bounce > buffering (swiotlb) without risking not being able to get a 32-bit address > during DMA allocation.
Umm. You can't just disable ZONE_DMA32. Linux absolutely requires a 32-bit dma mask to work, it is in fact the implicit default.
| |