linux-kernel - Re: [PATCH v2 5/5] iommu/amd - Add a debugfs entry to specify a IOMMU device table entry

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Message-ID: <3969f155-c3bf-44c5-d056-825e71d42152@amd.com>
Date:   Tue, 13 Mar 2018 13:54:15 -0500
From:   Gary R Hook <gary.hook@....com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] iommu/amd - Add a debugfs entry to specify a IOMMU
 device table entry

On 03/13/2018 12:20 PM, Andy Shevchenko wrote:
> 
>> +               oboff += OSCNPRINTF("%02x:%02x:%x (%u / %04x)\n",
>> +                                   PCI_BUS_NUM(amd_iommu_devid),
>> +                                   PCI_SLOT(amd_iommu_devid),
>> +                                   PCI_FUNC(amd_iommu_devid),
> 
> Perhaps at some point we will have an extension to %p to print PCI BDFs.

But until then....  ;-)

>> +       if (strnchr(obuf, OBUFLEN, ':'))
>> +       {
> 
> Style

D'oh!

>> +       } else if (obuf[0] == '0' && obuf[1] == 'x') {
>> +               n = sscanf(obuf, "%x", &amd_iommu_devid);
>> +       } else {
>> +               n = sscanf(obuf, "%d", &amd_iommu_devid);
>> +       }
> 
> kstrtoint() ?

I see various mechanisms for this sort of thing, and simply chose one.
Am happy to use whatever is preferred.