linux-kernel - Re: [PATCH] swiotlb: set IO TLB segment size via cmdline

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Message-ID: <20210914153046.GB815@lst.de>
Date:   Tue, 14 Sep 2021 17:30:46 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jan Beulich <jbeulich@...e.com>
Cc:     Roman Skakun <rm.skakun@...il.com>,
        Andrii Anisov <andrii_anisov@...m.com>,
        Roman Skakun <roman_skakun@...m.com>,
        Jonathan Corbet <corbet@....net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Maciej W. Rozycki" <macro@...am.me.uk>,
        Muchun Song <songmuchun@...edance.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Mike Rapoport <rppt@...nel.org>, Will Deacon <will@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] swiotlb: set IO TLB segment size via cmdline

On Tue, Sep 14, 2021 at 05:29:07PM +0200, Jan Beulich wrote:
> I'm not convinced the swiotlb use describe there falls under "intended
> use" - mapping a 1280x720 framebuffer in a single chunk? (As an aside,
> the bottom of this page is also confusing, as following "Then we can
> confirm the modified swiotlb size in the boot log:" there is a log
> fragment showing the same original size of 64Mb.

It doesn't.  We also do not add hacks to the kernel for whacky out
of tree modules.