linux-kernel - Re: [PATCH v4 5/6] iova: Add iova_len argument to init_iova

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Message-ID: <a7c2ce29-ca28-83a3-6432-a508df9825ac@huawei.com>
Date:   Mon, 2 Aug 2021 17:40:49 +0100
From:   John Garry <john.garry@...wei.com>
To:     Robin Murphy <robin.murphy@....com>, Will Deacon <will@...nel.org>
CC:     <joro@...tes.org>, <baolu.lu@...ux.intel.com>,
        <iommu@...ts.linux-foundation.org>, <linuxarm@...wei.com>,
        <thierry.reding@...il.com>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <jonathanh@...dia.com>, <sakari.ailus@...ux.intel.com>,
        <bingbu.cao@...el.com>, <tian.shu.qiu@...el.com>,
        <mchehab@...nel.org>, <gregkh@...uxfoundation.org>,
        <digetx@...il.com>, <mst@...hat.com>, <jasowang@...hat.com>,
        <linux-kernel@...r.kernel.org>, <chenxiang66@...ilicon.com>
Subject: Re: [PATCH v4 5/6] iova: Add iova_len argument to init_iova_domain()

On 02/08/2021 17:16, Robin Murphy wrote:
> On 2021-08-02 17:06, John Garry wrote:
>> On 02/08/2021 16:06, Will Deacon wrote:
>>> On Wed, Jul 14, 2021 at 06:36:42PM +0800, John Garry wrote:
>>>> Add max opt argument to init_iova_domain(), and use it to set the 
>>>> rcaches
>>>> range.
>>>>
>>>> Also fix up all users to set this value (at 0, meaning use default).
>>> Wrap that in init_iova_domain_defaults() to avoid the mysterious 0?
>>
>> Sure, I can do something like that. I actually did have separate along 
>> those lines in v3 before I decided to change it.
> 
> Y'know, at this point I'm now starting to seriously wonder whether 
> moving the rcaches into iommu_dma_cookie wouldn't make a whole lot of 
> things simpler... :/

As I see, the rcache stuff isn't really specific to IOVA anyway, so it 
seems sane.

> 
> Does that sound like crazy talk to you, or an idea worth entertaining?

If you're going to start moving things, has anyone considered putting 
rcache support in lib as a generic solution to "Magazines and Vmem: .." 
paper?

Thanks,
John