linux-kernel - Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock

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Message-ID: <YmqonHKBT8ftYHgY@infradead.org>
Date:   Thu, 28 Apr 2022 07:45:48 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Tianyu Lan <ltykernel@...il.com>, hch@...radead.org,
        m.szyprowski@...sung.com, michael.h.kelley@...rosoft.com,
        kys@...rosoft.com, parri.andrea@...il.com, thomas.lendacky@....com,
        wei.liu@...nel.org, Andi Kleen <ak@...ux.intel.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        linux-hyperv@...r.kernel.org, konrad.wilk@...cle.com,
        linux-kernel@...r.kernel.org, kirill.shutemov@...el.com,
        iommu@...ts.linux-foundation.org, andi.kleen@...el.com,
        brijesh.singh@....com, vkuznets@...hat.com, hch@....de
Subject: Re: [RFC PATCH 1/2] swiotlb: Split up single swiotlb lock

On Thu, Apr 28, 2022 at 03:44:36PM +0100, Robin Murphy wrote:
> Rather than introduce this extra level of allocator complexity, how about
> just dividing up the initial SWIOTLB allocation into multiple io_tlb_mem
> instances?

Yeah.  We're almost done removing all knowledge of swiotlb from drivers,
so the very last thing I want is an interface that allows a driver to
allocate a per-device buffer.