From: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
To: chenfeng <puck.chen-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>,
"joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org"
<joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>,
"iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"rcallicotte-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org"
<rcallicotte-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org"
<jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Cc: Dan zhao <dan.zhao-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>,
"Wangfei (William,
Euler)" <w.f-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
Suzhuangluan
<suzhuangluan-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>,
qijiwen <qijiwen-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>,
Peter Panshilin
<peter.panshilin-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
Subject: Re: How to ensure that different peripherals getting different IOVA address in kernel?
Date: Wed, 23 Sep 2015 13:08:28 +0100 [thread overview]
Message-ID: <5602963C.8030601@arm.com> (raw)
In-Reply-To: <560206AE.4020608-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
On 23/09/15 02:55, chenfeng wrote:
> Hi all,
>
> In IOMMU architecture , how to make two different peripherals share the same page table ?
>
> In other words , is there a mechanism or structure to make two peripherals get completely different address.
>
> eg:
>
> peri-A、peri-B and peri-C share the same iova address 0-1G for some performance requests.
>
> So the A,B,C need to use the same IOVA generator to ensure this,but I don't find an architecture to make this.
This is what IOMMU domains are all about: devices in one domain are
isolated from devices in different domains, so all you need to do is
make sure all devices that want to share buffers are attached to the
same domain, then they will all share that domain's IOVA space.
Robin.
>
> Any help will be appreciated.
>
> Puck
>
>
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: Robin Murphy <robin.murphy@arm.com>
To: chenfeng <puck.chen@hisilicon.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"rcallicotte@gmail.com" <rcallicotte@gmail.com>,
"jiang.liu@linux.intel.com" <jiang.liu@linux.intel.com>
Cc: Dan zhao <dan.zhao@hisilicon.com>,
qijiwen <qijiwen@hisilicon.com>,
Peter Panshilin <peter.panshilin@hisilicon.com>,
Suzhuangluan <suzhuangluan@hisilicon.com>,
Yiping Xu <xuyiping@hisilicon.com>,
"Wangfei (William, Euler)" <w.f@huawei.com>
Subject: Re: How to ensure that different peripherals getting different IOVA address in kernel?
Date: Wed, 23 Sep 2015 13:08:28 +0100 [thread overview]
Message-ID: <5602963C.8030601@arm.com> (raw)
In-Reply-To: <560206AE.4020608@hisilicon.com>
On 23/09/15 02:55, chenfeng wrote:
> Hi all,
>
> In IOMMU architecture , how to make two different peripherals share the same page table ?
>
> In other words , is there a mechanism or structure to make two peripherals get completely different address.
>
> eg:
>
> peri-A、peri-B and peri-C share the same iova address 0-1G for some performance requests.
>
> So the A,B,C need to use the same IOVA generator to ensure this,but I don't find an architecture to make this.
This is what IOMMU domains are all about: devices in one domain are
isolated from devices in different domains, so all you need to do is
make sure all devices that want to share buffers are attached to the
same domain, then they will all share that domain's IOVA space.
Robin.
>
> Any help will be appreciated.
>
> Puck
>
>
next prev parent reply other threads:[~2015-09-23 12:08 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5600AF72.2000106@hisilicon.com>
2015-09-23 1:55 ` How to ensure that different peripherals getting different IOVA address in kernel? chenfeng
2015-09-23 1:55 ` chenfeng
[not found] ` <560206AE.4020608-C8/M+/jPZTeaMJb+Lgu22Q@public.gmane.org>
2015-09-23 2:42 ` Jiang Liu
2015-09-23 2:42 ` Jiang Liu
2015-09-23 12:08 ` Robin Murphy [this message]
2015-09-23 12:08 ` Robin Murphy
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