linux-kernel - RE: [PATCH v3 02/21] libnd, nfit: initial libnd infrastructure and NFIT support

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Date:	Fri, 22 May 2015 16:12:14 +0000
From:	"Moore, Robert" <robert.moore@...el.com>
To:	Toshi Kani <toshi.kani@...com>
CC:	"Williams, Dan J" <dan.j.williams@...el.com>,
	Linda Knippers <linda.knippers@...com>,
	Jens Axboe <axboe@...nel.dk>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Neil Brown <neilb@...e.de>,
	Greg KH <gregkh@...uxfoundation.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"Ingo Molnar" <mingo@...nel.org>, "Zheng, Lv" <lv.zheng@...el.com>,
	"Christoph Hellwig" <hch@....de>
Subject: RE: [PATCH v3 02/21] libnd, nfit: initial libnd infrastructure and
 NFIT support

Here are the corrected strings:

/* NVDIMM - NFIT table */

#define UUID_VOLATILE_MEMORY            "7305944f-fdda-44e3-b16c-3f22d252e5d0"
#define UUID_PERSISTENT_MEMORY          "66f0d379-b4f3-4074-ac43-0d3318b78cdb"
#define UUID_CONTROL_REGION             "92f701f6-13b4-405d-910b-299367e8234c"
#define UUID_DATA_REGION                "91af0530-5d86-470e-a6b0-0a2db9408249"
#define UUID_VOLATILE_VIRTUAL_DISK      "77ab535a-45fc-624b-5560-f7b281d1f96e"
#define UUID_VOLATILE_VIRTUAL_CD        "3d5abd30-4175-87ce-6d64-d2ade523c4bb"
#define UUID_PERSISTENT_VIRTUAL_DISK    "5cea02c9-4d07-69d3-269f-4496fbe096f9"
#define UUID_PERSISTENT_VIRTUAL_CD      "08018188-42cd-bb48-100f-5387d53ded3d"



> -----Original Message-----
> From: Toshi Kani [mailto:toshi.kani@...com]
> Sent: Friday, May 22, 2015 8:21 AM
> To: Moore, Robert
> Cc: Williams, Dan J; Linda Knippers; Jens Axboe; linux-
> nvdimm@...ts.01.org; Neil Brown; Greg KH; Wysocki, Rafael J; linux-
> kernel@...r.kernel.org; Linux ACPI; Ingo Molnar; Zheng, Lv; Christoph
> Hellwig
> Subject: Re: [PATCH v3 02/21] libnd, nfit: initial libnd infrastructure
> and NFIT support
> 
> On Fri, 2015-05-22 at 14:58 +0000, Moore, Robert wrote:
> > It looks to me that you are correct and I screwed up when I made those
> strings.
> > The odd thing is that we had discussed this whole issue internally for
> > a few days
> >  -- then I went ahead and messed up the strings. I think my brain was
> > going around in circles.
> 
> Yes, endianness is always fun... :-)
> 
> > Anyway, here is the latest info, please have a look:
> >
> >
> > Below is the GUID for volatile memory region directly from the ACPI
> spec:
> >
> >
> > { 0x7305944F, 0xFDDA, 0x44E3, 0xB1, 0x6C, 0x3F, 0x22, 0xD2, 0x52,
> > 0xE5, 0xD0 }
> >
> > Here is an example of ToUUID using a corrected version of the GUID
> string. Note that the ordering of the string is identical to the version
> in the ACPI spec:
> >
> >       11:      Name (UUID, ToUUID ("7305944F-FDDA-44E3-B16C-
> 3F22D252E5D0"))
> >
> >
> > Here is the AML output of the ToUUID macro. Note that the first three
> fields are reversed, the rest of the string is left as-is (as per the
> ToUUID definition):
> >
> > 00000024:  08 55 55 49 44 .........    ".UUID"
> > 00000029:  11 13 0A 10 4F 94 05 73     "....O..s"
> > 00000031:  DA FD E3 44 B1 6C 3F 22     "...D.l?""
> > 00000039:  D2 52 E5 D0 ............    ".R.."
> >
> > This is the important part:
> >
> >            4F 94 05 73     "....O..s"
> > 00000031:  DA FD E3 44 B1 6C 3F 22     "...D.l?""
> > 00000039:  D2 52 E5 D0
> >
> >
> > I believe that this is correct.
> 
> Looks good!
> 
> Thanks,
> -Toshi
>