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Date: Thu, 7 Jan 2016 11:52:38 +0200
From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: "Wang, Annie" <Annie.Wang@amd.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
        Vinod Koul <vinod.koul@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
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        "dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
        Borislav Petkov <bp@alien8.de>, "Huang, Ray" <Ray.Huang@amd.com>,
        "Wan, Vincent" <Vincent.Wan@amd.com>, "Xue, Ken" <Ken.Xue@amd.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Graeme Gregory <gg@slimlogic.co.uk>, "Li, Tony" <Tony.Li@amd.com>,
        "Yu, Xiangliang" <Xiangliang.Yu@amd.com>
Subject: Re: [PATCH 3/6] ACPI: add 2 parameters to function acpi dma
 controller register
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On Wed, Jan 06, 2016 at 06:46:37AM +0000, Wang, Annie wrote:
> Acpi_dma_xlate  mainly converts an  acpi_dma  structure into a dma_chan structure.
> Without proper request line, wrong acpi_dma structure may be get. 
>
> And as Andy says in http://article.gmane.org/gmane.linux.kernel.iommu/11675 
> How about add a hook into acpi_dma_controller_register?

Hmm, you can pass custom data in acpi_dma_controller_register() which
will be assigned to adma->data. If you put your request line
information there, I think your custom acpi_dma_xlate() should be able
to use that information to find proper channel, no?