linux-kernel - Re: [PATCH V2 22/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks.

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Date:	Wed, 23 Dec 2015 17:38:45 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Gabriele Paoloni <gabriele.paoloni@...wei.com>,
	Tomasz Nowicki <tn@...ihalf.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"will.deacon@....com" <will.deacon@....com>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"Lorenzo.Pieralisi@....com" <Lorenzo.Pieralisi@....com>,
	"okaya@...eaurora.org" <okaya@...eaurora.org>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"Stefano.Stabellini@...citrix.com" <Stefano.Stabellini@...citrix.com>,
	"liudongdong (C)" <liudongdong3@...wei.com>
Cc:	"robert.richter@...iumnetworks.com" 
	<robert.richter@...iumnetworks.com>,
	"mw@...ihalf.com" <mw@...ihalf.com>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....com>,
	"ddaney@...iumnetworks.com" <ddaney@...iumnetworks.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	Wangyijing <wangyijing@...wei.com>,
	"Suravee.Suthikulpanit@....com" <Suravee.Suthikulpanit@....com>,
	"msalter@...hat.com" <msalter@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"jchandra@...adcom.com" <jchandra@...adcom.com>,
	"jcm@...hat.com" <jcm@...hat.com>
Subject: Re: [PATCH V2 22/23] pci, acpi: Match PCI config space accessors
 against platfrom specific quirks.

On 12/22/2015 10:48 PM, Gabriele Paoloni wrote:
> Hi Tomasz
>
>> -----Original Message-----
>> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
>> owner@...r.kernel.org] On Behalf Of Tomasz Nowicki
>> Sent: 22 December 2015 10:20
>> To: Gabriele Paoloni; bhelgaas@...gle.com; arnd@...db.de;
>> will.deacon@....com; catalin.marinas@....com; rjw@...ysocki.net;
>> hanjun.guo@...aro.org; Lorenzo.Pieralisi@....com; okaya@...eaurora.org;
>> jiang.liu@...ux.intel.com; Stefano.Stabellini@...citrix.com
>> Cc: robert.richter@...iumnetworks.com; mw@...ihalf.com;
>> Liviu.Dudau@....com; ddaney@...iumnetworks.com; tglx@...utronix.de;
>> Wangyijing; Suravee.Suthikulpanit@....com; msalter@...hat.com; linux-
>> pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
>> acpi@...r.kernel.org; linux-kernel@...r.kernel.org; linaro-
>> acpi@...ts.linaro.org; jchandra@...adcom.com; jcm@...hat.com
>> Subject: Re: [PATCH V2 22/23] pci, acpi: Match PCI config space
>> accessors against platfrom specific quirks.
>>
>> On 21.12.2015 12:47, Gabriele Paoloni wrote:
>>> 2) In the quirk mechanism you proposed, I see that the callback
>> function
>>>      allows to do some preparation work for the host bridge. For
>> example in
>>>      Hisilicon hip05 case we would need to read some values from the
>> ACPI
>>>      table (see acpi_pci_root_hisi_add() function in
>>>      https://lkml.org/lkml/2015/12/3/426).
>>>      I am quite new to ACPI and I wonder if it is OK to add such
>> "Packages"
>>>      to the  PCI host bridge ACPI device...or maybe we need to declare
>> a new
>>>      one...?
>>
>> I may miss sth so please correct me in that case.
>>
>> https://lkml.org/lkml/2015/12/3/426 shows that you need special
>> handling for root->secondary.start bus number only, right? So how about
>> creating special MCFG region <rc-base:rc-base+rc-size> only for
>> <segment,bus>.
>> Like that:
>>
>> [0008]                       Base Address : <rc-base>
>> [0002]               Segment Group Number : <segment>
>> [0001]                   Start Bus Number : <root->secondary.start>
>> [0001]                     End Bus Number : <root->secondary.start>
>> [0004]                           Reserved : 00000000
>>
>>
>> static const struct dmi_system_id hisi_quirk[] = {
>> 	{
>> 		.ident = "HiSi...",
>> 		.matches = {
>> 			DMI_MATCH(<whatever you need to match your platform>),
>> 		},
>> 	},
>> 	{ }
>> };
>>
>> static struct pci_ops hisi_ecam_pci_ops = {
>> 	.map_bus = pci_mcfg_dev_base,
>> 	.read = hisi_pcie_cfg_read,
>> 	.write = hisi_pcie_cfg_write,
>> };
>>
>> DECLARE_ACPI_MCFG_FIXUP(hisi_quirk, &hisi_ecam_pci_ops,
>> 			<segment>, <bus>);
>>
>> With above code you can use your custom PCI config accessor only for
>> that region.
>>
>> Let me know if that is not enough for you.
>
> In principle I think it can work...
>
> Liudongdong, Guo Hanjun what is your opinion about?

Let me and Dongdong prepare a patch for Hip05 and then will
back to this discussion to see if we met some problems.

Thanks
Hanjun
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