linux-kernel - Re: [PATCH 2/2] arm: use swiotlb for bounce buffer on LPAE configs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <a447eae1bb46fe753f7a62fb8932e680b79b1635.camel@suse.de>
Date:   Wed, 24 Jul 2019 19:23:50 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Christoph Hellwig <hch@....de>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Vignesh Raghavendra <vigneshr@...com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, Roger Quadros <rogerq@...com>
Subject: Re: [PATCH 2/2] arm: use swiotlb for bounce buffer on LPAE configs

On Tue, 2019-07-09 at 07:20 -0700, Christoph Hellwig wrote:
> The DMA API requires that 32-bit DMA masks are always supported, but on
> arm LPAE configs they do not currently work when memory is present
> above 4GB.  Wire up the swiotlb code like for all other architectures
> to provide the bounce buffering in that case.
> 
> Fixes: 21e07dba9fb11 ("scsi: reduce use of block bounce buffers").
> Reported-by: Roger Quadros <rogerq@...com>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---

Hi Chistoph,
Out of curiosity, what is the reason stopping us from using dma-direct/swiotlb
instead of arm_dma_ops altogether?

Regards,
Nicolas


Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)