linux-kernel - Re: [PATCH 08/10] iommu/omap: Use bus_set_iommu instead of register

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Message-ID: <CAK=WgbYvACc4U58WTxdndKtHgA0TxV-wFmO8bQLD65yuz_Hk0w@mail.gmail.com>
Date:	Mon, 26 Sep 2011 15:29:04 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	"Roedel, Joerg" <Joerg.Roedel@....com>
Cc:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alex Williamson <alex.williamson@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>,
	David Brown <davidb@...eaurora.org>,
	"joro@...tes.org" <joro@...tes.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/10] iommu/omap: Use bus_set_iommu instead of register_iommu

On Mon, Sep 26, 2011 at 3:22 PM, Roedel, Joerg <Joerg.Roedel@....com> wrote:
> That is interesting. What bus do these IOMMU users you talk about belong
> to?

E.g., virtio devices (which today originates from a platform device)
or even rpmsg users (which originates from the former virtio devices).

> Is it a seperate bus that originates from a platform device?

Yes.

> in that
> case the situation sounds a little bit like with USB on x86. The usb
> controlers are PCI devices and DMA handles are allocated using the
> pci_dev of the controler and not the usb_device.

Yeah, sounds very similar.

Thanks,
Ohad.
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