linux-kernel - Re: [PATCH v3 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU

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Date:   Tue, 17 Apr 2018 13:42:53 -0400
From:   "Hook, Gary" <ghook@....com>
To:     "Mehta, Sohil" <sohil.mehta@...el.com>,
        "gary.hook@....com" <gary.hook@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH v3 2/2] iommu/amd: Add basic debugfs infrastructure for
 AMD IOMMU

On 4/16/2018 8:52 PM, Mehta, Sohil wrote:
> On Fri, 2018-04-06 at 08:17 -0500, Gary R Hook wrote:
>>
>> diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
>> index 5eb1121d54b9..0ca250f626d9 100644
>> --- a/drivers/iommu/Makefile
>> +++ b/drivers/iommu/Makefile
>> @@ -11,6 +11,7 @@ obj-$(CONFIG_IOMMU_IOVA) += iova.o
>>   obj-$(CONFIG_OF_IOMMU) += of_iommu.o
>>   obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
>>   obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o
>> +obj-$(CONFIG_IOMMU_DEBUG) += amd_iommu_debugfs.o
> 
> Compiling amd_iommu_debugfs.c seems to depend only
> on CONFIG_IOMMU_DEBUG. Can we prevent the code within
> amd_iommu_debugfs.c from getting compiled when either CONFIG_AMD_IOMMU
> or CONFIG_IOMMU_DEBUG is disabled?

That's a good point. My intention was that only one switch was required 
to incorporate any DebugFS support, but I see now that I didn't consider 
all of the cases.

It appears that a per-device switch is also necessary. Unless someone 
has a better idea.

>>   obj-$(CONFIG_AMD_IOMMU_V2) += amd_iommu_v2.o
>>   obj-$(CONFIG_ARM_SMMU) += arm-smmu.o
>>   obj-$(CONFIG_ARM_SMMU_V3) += arm-smmu-v3.o