Re: [PATCH 1/4] of/fdt: Update zone_dma_bits when running in bcm2711
From: Christoph Hellwig <hch@lst.de>
Date: 2020-10-12 06:48:01
Also in:
linux-arm-kernel, linux-iommu, linux-mm, lkml
On Fri, Oct 09, 2020 at 06:10:52PM +0100, Catalin Marinas wrote:
kdump wants DMA-able memory and,
DMAable by whom? The only way to guranteed DMAable memory is to use the DMA memory allocator(s) and pass a specific device to them. Everyting else is just fundamentally broken. Note that even when device is not DMAable we can still use swiotlb to access it.