linux-kernel - Re: [PATCH v7 7/7] perf/amd/iommu: Enable support for multiple IOMMUs

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Date:   Sat, 14 Jan 2017 09:58:29 +0700
From:   Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <joro@...tes.org>, <peterz@...radead.org>, <mingo@...hat.com>
Subject: Re: [PATCH v7 7/7] perf/amd/iommu: Enable support for multiple IOMMUs



On 1/13/17 18:49, Borislav Petkov wrote:
> On Fri, Jan 13, 2017 at 05:24:01PM +0700, Suravee Suthikulpanit wrote:
>> IIUC, Perf tools looks at the /sys/devices/xxxxx to identify
>> availalble PMUs. Are you planning to have perf tools look at
>> /sys/devices/system/iommu/xxx instead?
>
> No, I'm planning to understand what do you mean exactly. Because the
> PMUs are, as I'm being pointed to, here:
>
> #define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
>
> Do you mean that, per chance?
>

Ah, okay. I can see the following directory path:

# ls -l  /sys/devices/
drwxr-xr-x  5 root root 0 Jan 13 20:36 amd_iommu_0

# ls -l /sys/bus/event_source/devices/
lrwxrwxrwx 1 root root 0 Jan 13 20:33 amd_iommu_0 -> ../../../devices/amd_iommu_0

I'll update the commit log to mention /bus/event_source/devices/amd_iommu_X instead.

Thanks,
S