linux-kernel - Re: [PATCH v4 2/7] iommu/core: split mapping to page sizes as supported by the hardware

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Message-ID: <CAHQjnOPkhR2SWO5Tov_V6Zw=zYb9EOJPbC1bENXJ+ttw_TB1HA@mail.gmail.com>
Date:	Sun, 13 Nov 2011 10:43:46 +0900
From:	KyongHo Cho <pullip.cho@...sung.com>
To:	Stepan Moskovchenko <stepanm@...eaurora.org>
Cc:	Joerg Roedel <Joerg.Roedel@....com>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Kai Huang <mail.kai.huang@...il.com>, kvm@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	David Brown <davidb@...eaurora.org>,
	linux-omap@...r.kernel.org, David Woodhouse <dwmw2@...radead.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 2/7] iommu/core: split mapping to page sizes as
 supported by the hardware

On Sat, Nov 12, 2011 at 11:04 AM, Stepan Moskovchenko
<stepanm@...eaurora.org> wrote:
> Yes, the scatterlist is allowed to have different page sizes. But, they are
> required to have a length that is a multiple of 4K. If a page in the list is

An element in scatterlist may not be aligned by 4K but I think IOMMU driver
must round it up to 4K if IOMMU API support iommu_map_range().

The first element in scatterlist is often not aligned by 4K if the pages are
provided from userspace. Length + offset of  the element must be
aligned by 4K, though.

Thank you,
KyongHo.
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