linux-kernel - Re: [PATCH V6 08/13] PCI: generic, thunder: update to use generic ECAM API

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Message-ID: <5715362A.7070701@semihalf.com>
Date:	Mon, 18 Apr 2016 21:31:54 +0200
From:	Tomasz Nowicki <tn@...ihalf.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Jayachandran C <jchandra@...adcom.com>,
	linux-arm-kernel@...ts.infradead.org,
	Bjorn Helgaas <helgaas@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>, rafael@...nel.org,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Sinan Kaya <okaya@...eaurora.org>, jiang.liu@...ux.intel.com,
	Jon Masters <jcm@...hat.com>, linaro-acpi@...ts.linaro.org,
	linux-pci@...r.kernel.org, Liviu.Dudau@....com,
	David Daney <ddaney@...iumnetworks.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	robert.richter@...iumnetworks.com, Suravee.Suthikulpanit@....com,
	msalter@...hat.com, Wangyijing <wangyijing@...wei.com>,
	Marcin Wojtas <mw@...ihalf.com>
Subject: Re: [PATCH V6 08/13] PCI: generic, thunder: update to use generic
 ECAM API

On 18.04.2016 16:44, Arnd Bergmann wrote:
> On Monday 18 April 2016 15:03:51 Tomasz Nowicki wrote:
>> On 16.04.2016 16:36, Jayachandran C wrote:
>>> On Sat, Apr 16, 2016 at 1:01 PM, Arnd Bergmann <arnd@...db.de> wrote:
>>>> On Saturday 16 April 2016 12:50:13 Jayachandran C wrote:
>>> The whole pci-thunder-*.c is to support thunder PCI quirks since the
>>> generic OF is handled by pci-host-common.c and generic ECAM is now
>>> separated -  duplicating the whole file for ACPI will be bad.
>>
>> Yes, it would be too much code duplication. Also, we already know
>> drivers which need quirks.
>>
>> We really need to agree on best approach here. Here are requirements
>> which came up (please correct me if misunderstood sth):
>>
>> Arnd:
>> 1. Initial DT driver should be standalone [Arnd]
>> 2. No exported symbols [Arnd]
>> 3. Duplicate necessary code to ACPI framework.
>
> Correct.
>
>> JC:
>> 1. Adding linker section is wrong.
>> 2. Quirks should be exported (pci_thunder_ecam_ops), then no need for
>> adding linker section
>> 3. To much duplication to copy code into the ACPI framework.
>>
>> My opinion:
>> 1. I like linker section because it is easy to maintain and no need to
>> export symbols.
>> 2. We need more sophisticated algorithm for matching quirks (DMI is not
>> enough and not only for ThunderX drivers). Of course I am open to any
>> new suggestions.
>
> Agreed.
>
>> 3. To much duplication to copy code into the ACPI framework.
>>
>> Thanks in advance for any pointers.
>
> Can you be more specific about what code actually would need to
> be duplicated? Anything besides the config space operations?
>

Basically the whole content of pci-thunder-ecam.c and pci-thunder-pem.c.

pci-thunder-ecam.c contains config space accessors. Similar for 
pci-thunder-pem.c but it also has extra init call (it is now called 
thunder_pem_init) which finds and maps related registers.

Thanks,
Tomasz