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Date:   Fri, 24 Feb 2017 01:20:58 +0700
From:   Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <joro@...tes.org>, <bp@...en8.de>, <mingo@...hat.com>
Subject: Re: [PATCH v8 9/9] perf/amd/iommu: Enable support for multiple IOMMUs



On 2/24/17 01:11, Peter Zijlstra wrote:
>> However, I have looked into reworking to not use the extra_regs, and I see
>> that the union in struct hw_perf_event currently contains various PMU-specific
>> structures (hardware, software, tracepoint, intel_cqm, itrace, amd_power,
>> and breakpoint).
>>
>> For amd_iommu PMU, we need additional registers for holding amd_iommu-specific
>> parameters. So, it seems that we can just introduce amd_iommu-specific struct
>> instead of re-using the existing structure for hardware events.
>>
>> I'm planning to add the following structure in the same union:
>>
>>     union {
>>         ......
>>                 struct { /* amd_iommu */
>>                         u8      iommu_csource;
>>                         u8      iommu_bank;
>>                         u8      iommu_cntr;
>>                         u16     iommu_devid;
>>                         u16     iommu_devid_msk;
>>                         u16     iommu_domid;
>>                         u16     iommu_domid_msk;
>>                         u32     iommu_pasid;
>>                         u32     iommu_pasid_msk;
>>                 };
>>     };
>>
>> Please let me know what you think, of if I am still missing your points.
> Yes, adding a struct to that union is fine and clarifies things. And
> just because I'm weird like that, there's a u8 hole after iommu_cntr.

Ok, I'll update this in V10 that I'll be sending out this week.

Thanks,
Suravee

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