linux-kernel - How to ensure that different peripherals getting different IOVA address in kernel?

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Date:	Wed, 23 Sep 2015 09:55:58 +0800
From:	chenfeng <puck.chen@...ilicon.com>
To:	<joro@...tes.org>, <iommu@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <rcallicotte@...il.com>,
	<robin.murphy@....com>, <jiang.liu@...ux.intel.com>
CC:	Dan zhao <dan.zhao@...ilicon.com>, qijiwen <qijiwen@...ilicon.com>,
	Peter Panshilin <peter.panshilin@...ilicon.com>,
	Suzhuangluan <suzhuangluan@...ilicon.com>,
	Yiping Xu <xuyiping@...ilicon.com>,
	"Wangfei (William, Euler)" <w.f@...wei.com>
Subject: How to ensure that different peripherals getting different IOVA
 address in kernel?

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.

Any help will be appreciated.

Puck

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