tree 0bb4ab767ca1f0fb42412efe713873e88e1d37e1
parent c114af3f88d0bd3ae504c09087193400af06829e
author Jianxiong Gao <jxgao@google.com> 1619717594 +0000
committer Oleksandr Tymoshenko <ovt@google.com> 1641504623 +0000

swiotlb: respect min_align_mask

commit: 1f221a0d0dbf0e48ef3a9c62871281d6a7819f05

swiotlb: respect min_align_mask

Respect the min_align_mask in struct device_dma_parameters in swiotlb.

There are two parts to it:
 1) for the lower bits of the alignment inside the io tlb slot, just
    extent the size of the allocation and leave the start of the slot
     empty
 2) for the high bits ensure we find a slot that matches the high bits
    of the alignment to avoid wasting too much memory

Based on an earlier patch from Jianxiong Gao <jxgao@google.com>.

BUG=b/205968222
TEST=presubmit
RELEASE_NOTE=None
SOURCE=UPSTREAM(f8e71c667ee12094b50f5a935133d080740cd66b)

cos-patch: lts-refresh
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jianxiong Gao <jxgao@google.com>
Tested-by: Jianxiong Gao <jxgao@google.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jianxiong Gao <jxgao@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Change-Id: Id005f45cbc6a316a5433cc6825ef9a6056e527d4