linux-kernel - Re: [PATCH 3/6] ACPI: add 2 parameters to function acpi dma controller register

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Message-ID: <CAHp75Vd6mWOy4qZk0uqHeurA5Mk4xX1qSSTa-fbWobCSpUo6zw@mail.gmail.com>
Date:	Thu, 7 Jan 2016 12:08:50 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	"Wang, Annie" <Annie.Wang@....com>,
	Vinod Koul <vinod.koul@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	"Huang, Ray" <Ray.Huang@....com>,
	"Wan, Vincent" <Vincent.Wan@....com>, "Xue, Ken" <Ken.Xue@....com>,
	Robin Murphy <robin.murphy@....com>,
	Graeme Gregory <gg@...mlogic.co.uk>,
	"Li, Tony" <Tony.Li@....com>,
	"Yu, Xiangliang" <Xiangliang.Yu@....com>
Subject: Re: [PATCH 3/6] ACPI: add 2 parameters to function acpi dma
 controller register

On Thu, Jan 7, 2016 at 11:52 AM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
> 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?

I like Mika's idea, so, please, go this way if there is no impediment.

-- 
With Best Regards,
Andy Shevchenko
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