On Wed, 26 May 2021 16:45:40 +0200, Frederic Barrat wrote:
This reverts commit 3c0468d4451eb6b4f6604370639f163f9637a479.
That commit was breaking alignment guarantees for the DMA address when
allocating coherent mappings, as described in
Documentation/core-api/dma-api-howto.rst
It was also noticed by Mellanox' driver:
[ 1515.763621] mlx5_core c002:01:00.0: mlx5_frag_buf_alloc_node:146:(pid 13402): unexpected map alignment: 0x0800000000c61000, page_shift=16
[ 1515.763635] mlx5_core c002:01:00.0: mlx5_cqwq_create:181:(pid
13402): mlx5_frag_buf_alloc_node() failed, -12
Applied to powerpc/fixes.
[1/1] Revert "powerpc/kernel/iommu: Align size for IOMMU_PAGE_SIZE() to save TCEs"
https://git.kernel.org/powerpc/c/59cc84c802eb923805e7bba425976a3df5ce35d8
cheers