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Date: Fri, 25 Nov 2022 16:49:23 +0100 From: Johan Hovold <johan@...nel.org> To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org> Cc: Johan Hovold <johan+linaro@...nel.org>, Bjorn Andersson <andersson@...nel.org>, Andy Gross <agross@...nel.org>, Konrad Dybcio <konrad.dybcio@...ainline.org>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, Christoph Hellwig <hch@....de>, Ard Biesheuvel <ardb@...nel.org>, Catalin Marinas <catalin.marinas@....com>, linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] arm64: dts: qcom: sc8280xp: fix PCIe DMA coherency On Fri, Nov 25, 2022 at 08:23:36PM +0530, Manivannan Sadhasivam wrote: > On Fri, Nov 25, 2022 at 03:43:59PM +0100, Johan Hovold wrote: > > On Fri, Nov 25, 2022 at 07:56:25PM +0530, Manivannan Sadhasivam wrote: > > > On Thu, Nov 24, 2022 at 03:25:01PM +0100, Johan Hovold wrote: > > I never claimed it would fix the problem, I explicitly wrote that it > > made it less likely to occur (to the point where my reproducer no longer > > triggers). > > > Increasing the buffer sizes to two pages to force CMA allocation also appears > > to make the problem go away. > > The "go away" part sounded like a claim to me and hence I added the statement. > But no worries :) Hopefully it's clear enough if you also read the preceding sentence (with emphasis added): presumably as these queues are small enough to not be allocated using CMA which in turn make them *more likely to be cached* (e.g. due to accesses to nearby pages through the cacheable linear map). Johan
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