linux-kernel - Re: [net-next] pci_regs.h: Add PCI bus link speed and width defines

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Date:	Fri, 3 Jan 2014 13:53:08 -0800
From:	Jesse Brandeburg <jesse.brandeburg@...il.com>
To:	David Miller <davem@...emloft.net>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Cc:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	NetDEV list <netdev@...r.kernel.org>, gospo@...hat.com,
	sassmann@...hat.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bjorn.helgaas@...com>
Subject: Re: [net-next] pci_regs.h: Add PCI bus link speed and width defines

+linux-pci

<and see note below>

On Thu, Jan 2, 2014 at 4:21 PM, David Miller <davem@...emloft.net> wrote:
> From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Date: Sat, 28 Dec 2013 04:36:13 -0800
>
>> Add missing PCI bus link speed 8.0 GT/s and bus link widths of
>> x1, x2, x4 and x8.
>>
>> CC: <linux-kernel@...r.kernel.org>
>> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>
> Can a PCI person please ACK this?  This is a prerequisite for some
> networking driver changes Jeff would like to push to me.
>
> Thanks.
>
>> ---
>>  include/uapi/linux/pci_regs.h | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
>> index 4a98e85..c870c2a 100644
>> --- a/include/uapi/linux/pci_regs.h
>> +++ b/include/uapi/linux/pci_regs.h
>> @@ -489,7 +489,12 @@
>>  #define  PCI_EXP_LNKSTA_CLS  0x000f  /* Current Link Speed */
>>  #define  PCI_EXP_LNKSTA_CLS_2_5GB 0x0001 /* Current Link Speed 2.5GT/s */
>>  #define  PCI_EXP_LNKSTA_CLS_5_0GB 0x0002 /* Current Link Speed 5.0GT/s */
>> +#define  PCI_EXP_LNKSTA_CLS_8_0GB 0x0003 /* Current Link Speed 8.0GT/s */
>>  #define  PCI_EXP_LNKSTA_NLW  0x03f0  /* Negotiated Link Width */
>> +#define  PCI_EXP_LNKSTA_NLW_X1       0x0010  /* Current Link Width x1 */
>> +#define  PCI_EXP_LNKSTA_NLW_X2       0x0020  /* Current Link Width x2 */
>> +#define  PCI_EXP_LNKSTA_NLW_X4       0x0040  /* Current Link Width x4 */
>> +#define  PCI_EXP_LNKSTA_NLW_X8       0x0080  /* Current Link Width x8 */
>>  #define  PCI_EXP_LNKSTA_NLW_SHIFT 4  /* start of NLW mask in link status */
>>  #define  PCI_EXP_LNKSTA_LT   0x0800  /* Link Training */
>>  #define  PCI_EXP_LNKSTA_SLC  0x1000  /* Slot Clock Configuration */

also note that these defines from this patch are already partially
defined in drivers/pci/probe.c but likely need to move into a header
file and be consolidated throughout the kernel.  That said I don't see
any issue with adding these as a separate set of defines in
uapi/linux/pci_regs.h
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