linux-kernel - Re: [PATCH part1 v5 3/7] PCI: Add support for Device Serial Number capability

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Message-ID: <52F982FF.2070007@huawei.com>
Date:	Tue, 11 Feb 2014 09:55:11 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Oliver Neukum <oneukum@...e.de>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	Hanjun Guo <guohanjun@...wei.com>,
	Paul Bolle <pebolle@...cali.nl>,
	"RafaelJ.Wysocki" <rjw@...ysocki.net>,
	Gu Zheng <guz.fnst@...fujitsu.com>
Subject: Re: [PATCH part1 v5 3/7] PCI: Add support for Device Serial Number
 capability

On 2014/2/10 18:21, Oliver Neukum wrote:
> 
> On Mon, 2014-02-10 at 12:04 +0800, Yijing Wang wrote:
>> +static u64 pci_device_serial_number(struct pci_bus *bus, int devfn)
>> +{
>> +       int pos;
>> +       u32 lo, hi;
>> +
>> +       if (!pci_bus_find_capability(bus, devfn, PCI_CAP_ID_EXP))
>> +               return 0;
>> +
>> +       pos = pci_bus_find_ext_capability(bus, devfn,
>> PCI_EXT_CAP_ID_DSN);
>> +       if (!pos)
>> +               return 0;
>> +
>> +       pci_bus_read_config_dword(bus, devfn, pos + 4, &lo);
>> +       pci_bus_read_config_dword(bus, devfn, pos + 8, &hi);
> 
> We have no macro for that?

Yes, I will try to define macros for them, thanks!

> 
>> +       return ((u64)hi << 32) | lo;
>> +}
> 
> 	Regards
> 		Oliver
> 
> 
> 
> 
> .
> 


-- 
Thanks!
Yijing

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