linux-kernel - Re: sriov capability enumeration returns false.

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Message-ID: <CAHBu3shj6t_xK3gqtLEs+rDbeV-EPWDO+BZqFvy4xWEq1sEdaA@mail.gmail.com>
Date:	Thu, 2 Jun 2016 12:38:34 +0100
From:	alan hopes <hopes.alan@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: sriov capability enumeration returns false.

Any suggestions ?

Alan

On Thu, Jun 2, 2016 at 7:59 AM, alan hopes <hopes.alan@...il.com> wrote:
> Hi,
>
> I am working on a simple graphics driver that just enumerates SRIOV
> capability of PCI graphics controller.
> During the init phase of the driver i.e. when the driver loads, I find
> the PCI device based on my vendor ID and device ID, and then I check
> if pDev->sriov and and I get the value false even though I can see the
> SRIOV capability set using lspci.
>
> Code for checking SRIOV capability:
> pdev = get device based on device ID and vendor ID.
> if (pDev->sriov)
>       return false.
>
> Output of lspci correctly reporting SRIOV capability at offset 0x330.
>
> "
> Capabilities: [330 v1] Single Root I/O Virtualization (SR-IOV)
>                 IOVCap: Migration-, Interrupt Message Number: 000
>                 IOVCtl: Enable- Migration- Interrupt- MSE- ARIHierarchy+
>                 IOVSta: Migration-
>                 Initial VFs: 16, Total VFs: 16, Number of VFs: 0,
> Function Dependency Link: 00
>                 VF offset: 256, stride: 1, Device ID: xxxx
>                 Supported Page Size: 00000553, System Page Size: 00000001
>                 Region 0: Memory at 0000021ee0000000 (64-bit, prefetchable)
>                 Region 2: Memory at 0000021ff0000000 (64-bit, prefetchable)
>                 Region 5: Memory at 98c00000 (32-bit, non-prefetchable)
>                 VF Migration: offset: 00000000, BIR: 0
> "
>
> I can see, using lspci, that card has been setup properly with SRIOV
> enabled. But then why my driver is not able to see this value. I think
> I am missing something, Please can you suggest what I am doing wrong
> here..
>
> Thanks
> Alan