linux-kernel - Re: [PATCH 1/2] arm64: amd-seattle: Fix dma-ranges property

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Date:	Tue, 2 Dec 2014 14:12:48 +0000
From:	"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
To:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
CC:	"mark.rutland@....com" <mark.rutland@....com>,
	"will.deacon@....com" <will.deacon@....com>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"liviu.dudau@....com" <liviu.dudau@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>
Subject: Re: [PATCH 1/2] arm64: amd-seattle: Fix dma-ranges property

Hi Arnd,

On 12/1/14, 20:33, "Arnd Bergmann" <arnd@...db.de> wrote:

>On Sunday 30 November 2014 21:46:39 suravee.suthikulpanit@....com wrote:
>> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>> 
>> AMD Seattle should support 40-bit DMA.
>> 
>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>> 
>
>The change looks good, but two things about the patch description:
>
>- You should be a little more verbose, especially after we had discussed
>  this to some detail on IRC, explain why you use the specific values.

Would you minding adding the following detail in the commit message?

- BEGIN -
AMD Seattle supports 40-bit DMA, which includes two ranges:
    1. GICv2m MSI register frame at 0xe0080000
    2. DRAM range [0x8000000000 to 0xffffffffff]

Since the current parsing logic handles only single range, this patch
specifies the range from zero to 0x10000000000 to cover the whole
40-bit range.

However, it expects DMA allocation/mapping logic to check the specified
DMA range against the reported DRAM range, which starts from
0x8000000000 in this case.
- END -

>
>- You should configure git-send-email to know your full email address
>  including the name. Right now it gets sent from
>  "suravee.suthikulpanit@....com" instead of "Suravee Suthikulpanit
>  <Suravee.Suthikulpanit@....com>", and that causes the extra From
>  line at the start of the mail, besides looking a bit strange.

Thanks for the pointer. I didn¹t notice that. I¹ll fix that for the future.

Suravee
>
>Thanks,
>
>	Arnd

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