linux-kernel - Re: [PATCH v10 0/4] Add uacce module for Accelerator

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Message-ID: <20200110100818.0000151a@Huawei.com>
Date:   Fri, 10 Jan 2020 10:08:18 +0000
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     zhangfei <zhangfei.gao@...aro.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        <grant.likely@....com>, jean-philippe <jean-philippe@...aro.org>,
        "Jerome Glisse" <jglisse@...hat.com>,
        <ilias.apalodimas@...aro.org>, <francois.ozog@...aro.org>,
        <kenneth-lee-2012@...mail.com>, Wangzhou <wangzhou1@...ilicon.com>,
        "haojian . zhuang" <haojian.zhuang@...aro.org>,
        <guodong.xu@...aro.org>, <linux-accelerators@...ts.ozlabs.org>,
        <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <iommu@...ts.linux-foundation.org>,
        Dave Jiang <dave.jiang@...el.com>
Subject: Re: [PATCH v10 0/4] Add uacce module for Accelerator

On Fri, 10 Jan 2020 15:03:25 +0800
zhangfei <zhangfei.gao@...aro.org> wrote:

> On 2020/1/10 上午1:49, Jonathan Cameron wrote:
> > On Mon, 16 Dec 2019 11:08:13 +0800
> > Zhangfei Gao <zhangfei.gao@...aro.org> wrote:
> >  
> >> Uacce (Unified/User-space-access-intended Accelerator Framework) targets to
> >> provide Shared Virtual Addressing (SVA) between accelerators and processes.
> >> So accelerator can access any data structure of the main cpu.
> >> This differs from the data sharing between cpu and io device, which share
> >> data content rather than address.
> >> Because of unified address, hardware and user space of process can share
> >> the same virtual address in the communication.
> >>
> >> Uacce is intended to be used with Jean Philippe Brucker's SVA
> >> patchset[1], which enables IO side page fault and PASID support.
> >> We have keep verifying with Jean's sva patchset [2]
> >> We also keep verifying with Eric's SMMUv3 Nested Stage patches [3]  
> > Hi Zhangfei Gao,
> >
> > Just to check my understanding...
> >
> > This patch set is not dependent on either 2 or 3?
> >
> > To use it on our hardware, we need 2, but the interfaces used are already
> > upstream, so this could move forwards in parallel.
> >
> >  
> Yes,
> patch 1, 2 is for uacce.
> patch 3, 4 is an example using uacce, which happen to be crypto.
Sorry, I wasn't clear enough.

Question is whether we need Jean's sva patch set [2] to merge this?

> 
> Thanks