linux-kernel - Re: [PATCH v3 00/32] provide interfaces to access PCIe capabilities registers

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Message-ID: <502A72EF.3030303@gmail.com>
Date:	Tue, 14 Aug 2012 23:46:55 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Don Dutile <ddutile@...hat.com>, Yinghai Lu <yinghai@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Yijing Wang <wangyijing@...wei.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v3 00/32] provide interfaces to access PCIe capabilities
 registers

Hi Bjorn,
	No problem, will handle issues mentioned below.
	Regards!
	Gerry
On 08/14/2012 12:25 PM, Bjorn Helgaas wrote:
> On Wed, Aug 1, 2012 at 8:54 AM, Jiang Liu <liuj97@...il.com> wrote:
>> From: Jiang Liu <liuj97@...il.com>
>>
>> As suggested by Bjorn Helgaas and Don Dutile in threads
>> http://www.spinics.net/lists/linux-pci/msg15663.html, we could improve access
>> to PCIe capabilities register in to way:
>> 1) cache content of PCIe Capabilities Register into struct pce_dev to avoid
>>    repeatedly reading this register because it's read only.
>> 2) provide access functions for PCIe Capabilities registers to hide differences
>>    among PCIe base specifications, so the caller don't need to handle those
>>    differences.
>>
>> This patch set applies to
>> git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci-next
> 
> Would you mind rebasing this to v3.6-rc1?  I think you posted this
> when my branch was still 3.5-based, and there are some upstream
> changes that cause minor conflicts here.
> 
> You currently have:
> 
>     int pci_pcie_capability_change_word(struct pci_dev *dev, int pos,
> u16 set_bits, u16 clear_bits)
> 
> I think this is a bit awkward because the function name doesn't
> suggest *how* the word will be changed, and the clearing happens
> before the setting (opposite the parameter order).  Something like:
> 
>     int pci_pcie_capability_mask_and_set_word(..., u16 mask, u16 set) or
>     int pci_pcie_capability_clear_and_set_word(..., u16 clear, u16 set)
> 
> would be more obvious.  If you use "mask_and_set", I think the
> function should do "(val & mask) | set" with the complement being at
> the call site.  If you use "clear_and_set", I think it's OK to do
> "(val & ~mask) | set" as in your current patch.
> 
> I know I suggested the "pci_pcie_capability_*" names, but they're
> getting a bit unwieldy, especially if we do "mask_and_set" or similar.
>  There are already several "pcie_*" functions, so maybe we should
> drop the leading "pci_" from these and just have:
> 
>     pcie_capability_read_word
>     pcie_capability_write_word
>     pcie_capability_mask_and_set_word
> 
> Bjorn
> 

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