linux-kernel - Re: [RFC 2/6] omap: iovmm: generic iommu api migration

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Date:	Tue, 7 Jun 2011 13:28:53 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	linux-media@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Hiroshi.DOYU@...ia.com, arnd@...db.de, davidb@...eaurora.org,
	Joerg.Roedel@....com
Subject: Re: [RFC 2/6] omap: iovmm: generic iommu api migration

Hi Laurent,

On Tue, Jun 7, 2011 at 12:05 PM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> pgsz isn't used anymore, you can remove it.

Ok.

>> +             order = get_order(bytes);
>
> Does iommu_map() handle offsets correctly, or does it expect pa to be aligned
> to an order (or other) boundary ?

Right now we have a BUG_ON if pa is unaligned, but that can be changed
if needed (do we want it to handle offsets ?).

> As Russell pointed out, we should use sg->length instead of sg_dma_length(sg).
> sg_dma_length(sg) is only valid after the scatter list has been DMA-mapped,
> which doesn't happen in the iovmm driver. This applies to all sg_dma_len(sg)
> calls.

I'll make sure I don't introduce such calls, but it sounds like a
separate patch should take care of the existing ones; pls tell me if
you want me to send one.

Thanks,
Ohad.
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