linux-kernel - Re: [Resend PATCH 5/5] IA64/PCI/ACPI: Rework PCI root bridge ACPI resource conversion

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Message-ID: <526BF37E.8040801@intel.com>
Date:	Sun, 27 Oct 2013 00:53:18 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Tony Luck <tony.luck@...el.com>, Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Yinghai Lu <yinghai@...nel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Yoknis, Mike" <mike.yoknis@...com>,
	"Pearson, Greg" <greg.pearson@...com>
Subject: Re: [Resend PATCH 5/5] IA64/PCI/ACPI: Rework PCI root bridge ACPI
 resource conversion

On 10/24/2013 06:39 AM, Bjorn Helgaas wrote:
> [+cc Greg]
>
> On Fri, Oct 18, 2013 at 08:44:12PM +0800, Lan Tianyu wrote:
>> On 10/18/2013 04:33 AM, Bjorn Helgaas wrote:
>>> On Thu, Oct 17, 2013 at 12:09 AM, Lan Tianyu <tianyu.lan@...el.com> wrote:
>>>> On 2013å¹´10æœˆ17æ—¥ 07:55, Bjorn Helgaas wrote:
>>>>> On Fri, Oct 11, 2013 at 08:19:01PM +0800, tianyu.lan@...el.com wrote:
>
>>> I wonder if it would make sense to make
>>> acpi_dev_resource_address_space() ignore addr.translation_offset for
>>> IO resources.  Or maybe ignore it if the _TTP (type translation) bit
>>> is set?
>>
>> I wonder why current code doesn't check _TTP? The code in the
>> add_io_space() seems to think _TTP is always set, right?
>
> I think it's an oversight, and you should fix it.  I suggest that you
> ignore the _TRA value when _TTP is set.  Obviously this only applies
> to I/O port resources, since _TTP is only defined in the I/O Resource
> Flag (Table 6-185 in ACPI 5.0 spec).

_TTP is also defined in the Memory Resource flag, Please have a look at
Table 6-184 in the ACPI 5.0 Spec.

I am not sure how to deal with _TTP unsetting io resource? _TTP 
unsetting mean the resource is IO on the primary side and also IO on the 
secondary side.

>
>>> Mike, is there any chance you could collect an acpidump from an
>>> rx7620 or similar ia64 system?  In particular, I want to see a
>>> multi-node system where we have several PCI domains, and whether it
>>> sets the _TTP bits.
>
> Greg collected an acpidump from an HP system that uses these I/O port
> ranges.  Unfortunately the system wasn't running Linux, so it's an EFI
> dump, not the usual one we get from the "pmtools" package.  But I
> think it has the information we want.
>
> It's huge, and I put some of the relevant parts of it here:
> https://bugzilla.kernel.org/show_bug.cgi?id=63581  Here's a sample
> that shows the _TTP bit is set for the I/O aperture:
>
>      Device E000 (\_SB_.N000.E000)
>        Name _SEG (\_SB_.N000.E000._SEG)
>          0x01
>        Name _CRS (\_SB_.N000.E001._CRS)
>          Buffer
>            0x0092
>            ByteList <0x88 0x0d 0x00 0x02 0x0e 0x00 0x00 0x00
>                      0x00 0x00 0xff 0x00 0x00 0x00 0x00 0x01
>
>                      0x8a 0x2b 0x00 0x01 0x0c 0x33 0x00 0x00
>                      0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
>                      0x00 0x00 0x00 0x00 0x00 0x00 0xff 0xff
>                      0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
>                      0x00 0xd0 0x00 0x04 0x00 0x00 0x00 0x00
>                      0x01 0x00 0x00 0x00 0x00 0x00
>
> Byte 0: 0x8a (QWORD address space descriptor)
> Byte 3: Resource Type = 0x01 (I/O range)
> Byte 5: Type Specific Flags = 0x33 (_TRS, _TTP, _RNG = 3)
>
>            QWORD Address Space Descriptor:
>               Type: I/O
>               Flags:  Sparse, Translate, ISA I/O addresses, Non-ISA I/O addresses
>               GRA: 0x0000000000000000
>               MIN: 0x0000000000000000  MAX: 0x000000000000ffff
>               TRA: 0x00000400d0000000  LEN: 0x0000000000010000
>               MAX address fixed
>               MIN address fixed
>               Address positively decoded
>               Device produces and consumes this resource
>
> Bjorn
>

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