linux-kernel - RE: [PATCH V1 11/11] arm64, pci, acpi: Support for ACPI based PCI hostbridge init

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Date:	Tue, 3 Nov 2015 18:00:10 +0000
From:	Gabriele Paoloni <gabriele.paoloni@...wei.com>
To:	David Daney <ddaney@...iumnetworks.com>,
	Hanjun Guo <hanjun.guo@...aro.org>
CC:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Sinan Kaya <okaya@...eaurora.org>,
	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>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"robert.richter@...iumnetworks.com" 
	<robert.richter@...iumnetworks.com>,
	"Narinder.Dhillon@...iumnetworks.com" 
	<Narinder.Dhillon@...iumnetworks.com>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....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>,
	"Wangzhou (B)" <wangzhou1@...ilicon.com>,
	"liudongdong (C)" <liudongdong3@...wei.com>
Subject: RE: [PATCH V1 11/11] arm64, pci, acpi: Support for ACPI based PCI
 hostbridge init

Hi David

> -----Original Message-----
> From: David Daney [mailto:ddaney@...iumnetworks.com]
> Sent: 03 November 2015 17:39
> To: Hanjun Guo
> Cc: Lorenzo Pieralisi; Sinan Kaya; Tomasz Nowicki; bhelgaas@...gle.com;
> arnd@...db.de; will.deacon@....com; catalin.marinas@....com; rjw@...ysocki.net;
> jiang.liu@...ux.intel.com; robert.richter@...iumnetworks.com;
> Narinder.Dhillon@...iumnetworks.com; Liviu.Dudau@....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; Gabriele Paoloni; Wangzhou
> (B); liudongdong (C)
> Subject: Re: [PATCH V1 11/11] arm64, pci, acpi: Support for ACPI based PCI
> hostbridge init
> 
> On 11/03/2015 07:19 AM, Hanjun Guo wrote:
> > On 11/03/2015 10:15 PM, Lorenzo Pieralisi wrote:
> >> On Wed, Oct 28, 2015 at 02:46:37PM -0400, Sinan Kaya wrote:
> >>
> >> [...]
> >>
> >>>> -int raw_pci_write(unsigned int domain, unsigned int bus,
> >>>> -        unsigned int devfn, int reg, int len, u32 val)
> >>>> +struct pci_ops pci_root_ops = {
> >>>> +    .map_bus = pci_mcfg_dev_base,
> >>>> +    .read = pci_generic_config_read,
> >>>> +    .write = pci_generic_config_write,
> >>>
> >>>
> >>> Can you change these with pci_generic_config_read32 and
> >>> pci_generic_config_write32? We have some targets that can only do 32
> >>> bits PCI config space access.
> >>
> >> No.
> >>
> >> http://www.spinics.net/lists/linux-pci/msg44869.html
> >>
> >> Can you be a bit more specific please ?
> >>
> >> Sigh. Looks like we have to start adding platform specific quirks even
> >> before we merged the generic ACPI PCIe host controller implementation.
> >
> > Cc Gab, Zhou, and Dondong who upstream the hip05 (designware) PCIe host
> > support.
> >
> > I think so, some platform may not support ECAM for root complex,
> > which needs special handling of access config space, we may need
> > to consider those cases.
> >
> 
> Yes, it is indeed true.  For example, some Cavium ThunderX processors
> fall into this category.
> 
> Some options I thought of are:
> 
>   o Use DECLARE_ACPI_MCFG_FIXUP() in the kernel to supply the needed
> config space accessors.
> 
>   o Define additional root_device_ids that imply the needed config space
> accessors.

Yes I like this

it would fit designware too

Gab

> 
> 
> > Thanks
> > Hanjun

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