netdev - Re: [PATCH v9 5/6] iommu/dma: Allow a single FQ in addition to per-CPU FQs

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Message-ID: <ZGIuj2pRjOPffqZZ@ziepe.ca>
Date: Mon, 15 May 2023 10:07:27 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Niklas Schnelle <schnelle@...ux.ibm.com>,
	Robin Murphy <robin.murphy@....com>
Cc: Joerg Roedel <joro@...tes.org>, Matthew Rosato <mjrosato@...ux.ibm.com>,
	Will Deacon <will@...nel.org>, Wenjia Zhang <wenjia@...ux.ibm.com>,
	Gerd Bayer <gbayer@...ux.ibm.com>,
	Julian Ruess <julianr@...ux.ibm.com>,
	Pierre Morel <pmorel@...ux.ibm.com>,
	Alexandra Winter <wintera@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	David Woodhouse <dwmw2@...radead.org>,
	Lu Baolu <baolu.lu@...ux.intel.com>, Andy Gross <agross@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Yong Wu <yong.wu@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Orson Zhai <orsonzhai@...il.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Chunyan Zhang <zhang.lyra@...il.com>, Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Krishna Reddy <vdumpa@...dia.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Jonathan Corbet <corbet@....net>, linux-s390@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev, asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	linux-mediatek@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
	linux-tegra@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v9 5/6] iommu/dma: Allow a single FQ in addition to
 per-CPU FQs

On Mon, May 15, 2023 at 11:15:55AM +0200, Niklas Schnelle wrote:

> +/**
> + * struct dma_iommu_options - Options for dma-iommu
> + *
> + * @flags: Flag bits for enabling/disabling dma-iommu settings
> + *
> + * This structure is intended to provide IOMMU drivers a way to influence the
> + * behavior of the dma-iommu DMA API implementation. This allows optimizing for
> + * example for a virtualized environment with slow IOTLB flushes.
> + */
> +struct dma_iommu_options {
> +#define IOMMU_DMA_OPTS_PER_CPU_QUEUE	(0L << 0)
> +#define IOMMU_DMA_OPTS_SINGLE_QUEUE	(1L << 0)
> +	u64	flags;
> +};

You need to hash it out with robin if we do something like this or use
more untyped caps as he put in this series:

https://lore.kernel.org/linux-iommu/cover.1683233867.git.robin.murphy@arm.com/

Jason