linux-kernel - Re: [PATCH v8 9/9] perf/amd/iommu: Enable support for multiple IOMMUs

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Message-ID: <5f33aeb4-7296-db7d-ad86-ea982f266040@amd.com>
Date:   Tue, 7 Feb 2017 08:58:33 +0700
From:   Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Peter Zijlstra <peterz@...radead.org>,
        <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <joro@...tes.org>, <mingo@...hat.com>
Subject: Re: [PATCH v8 9/9] perf/amd/iommu: Enable support for multiple IOMMUs

Boris,

On 1/25/17 16:55, Borislav Petkov wrote:
> On Wed, Jan 25, 2017 at 10:46:53AM +0100, Peter Zijlstra wrote:
>> Which is absolutely insane.
>
> Right,
>
> IMO, the simplest thing to do for your purposes is to embed a struct
> amd_iommu pointer into struct perf_amd_iommu at init time so that you
> don't have to do all that crazy dance in the PMU functions and iterate
> over the iommus in get_amd_iommu() each time.
>
> Which would then simplify all your other functions. For example:
>
> int amd_iommu_pc_get_reg(unsigned int idx, u8 bank, u8 cntr, u8 fxn, u64 *value)
>
> should be
>
> int amd_iommu_pc_get_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
>
> and you can save yourself a lot of glue code and get rid of that
> get_amd_iommu() thing.
>

That's a good idea. Thanks. I'll do this in V9.

Suravee