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[142.68.25.194]) by smtp.gmail.com with ESMTPSA id n27-20020ac81e1b000000b003e388264753sm5328251qtl.65.2023.05.15.06.07.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 May 2023 06:07:28 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.95) (envelope-from ) id 1pyXvD-000xlt-MR; Mon, 15 May 2023 10:07:27 -0300 Date: Mon, 15 May 2023 10:07:27 -0300 From: Jason Gunthorpe To: Niklas Schnelle , Robin Murphy Cc: Joerg Roedel , Matthew Rosato , Will Deacon , Wenjia Zhang , Gerd Bayer , Julian Ruess , Pierre Morel , Alexandra Winter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Suravee Suthikulpanit , Hector Martin , Sven Peter , Alyssa Rosenzweig , David Woodhouse , Lu Baolu , Andy Gross , Bjorn Andersson , Konrad Dybcio , Yong Wu , Matthias Brugger , AngeloGioacchino Del Regno , Gerald Schaefer , Orson Zhai , Baolin Wang , Chunyan Zhang , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Thierry Reding , Krishna Reddy , Jonathan Hunter , Jonathan Corbet , linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH v9 5/6] iommu/dma: Allow a single FQ in addition to per-CPU FQs Message-ID: References: <20230310-dma_iommu-v9-0-65bb8edd2beb@linux.ibm.com> <20230310-dma_iommu-v9-5-65bb8edd2beb@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230310-dma_iommu-v9-5-65bb8edd2beb@linux.ibm.com> Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org 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