From: John Garry <john.garry@huawei.com>
To: Will Deacon <will@kernel.org>
Cc: mark.rutland@arm.com, Robin Murphy <robin.murphy@arm.com>,
linuxarm@huawei.com, linux-kernel@vger.kernel.org,
qiangqing.zhang@nxp.com, zhangshaokun@hisilicon.com,
jolsa@redhat.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] drivers/perf: hisi: Add identifier sysfs file
Date: Thu, 1 Oct 2020 09:34:02 +0100 [thread overview]
Message-ID: <f9ef4f4f-beeb-7898-0655-3cd682605b93@huawei.com> (raw)
In-Reply-To: <20200715083016.GB5683@willie-the-truck>
On 15/07/2020 09:30, Will Deacon wrote:
> Hi John,
>
> On Wed, Jul 15, 2020 at 09:23:19AM +0100, John Garry wrote:
>>> On Wed, Jun 17, 2020 at 09:05:11PM +0800, John Garry wrote:
>>>> To allow userspace to identify the specific implementation of the device,
>>>> add an "identifier" sysfs file.
>>>>
>>>> Encoding is as follows:
>>>> hi1620: 0x0 (aka hip08)
>>>> hi1630: 0x30
>>>>
>>>> Signed-off-by: John Garry <john.garry@huawei.com>
>>>
>>> I'm struggling a bit to track this. If you still think it's worth pursuing,
>>> please could you post a series with a cover-letter describing what this is
>>> for, a link to the userspace changes and then patches for all the PMU
>>> drivers that need updating?
>>
>> There is no hi1630 userspace support yet.
>>
>> So what I can do is post updated userspace support (including hi1630), and
>> then post kernel parts together for all drivers we could initially support.
>>
>> @Joakim, I'll pick your imx driver changes here, if you don't mind.
>>
>> There was an RFC from you for the SMMUv3 PMU as
>>> well, and also some other "arm64" changes.
>>>
>>
>> I hope to drop that RFC if an updated SMMUv3 spec helps us out.
>
Released SMMUv3.3 spec provides a PMCG_IIDR reg, which we can now use to
identify the implementation:
https://developer.arm.com/documentation/ihi0070/da/?lang=en
So I'll look to put the userspace and kernel parts together for this now
for review.
Thanks,
John
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next prev parent reply other threads:[~2020-10-01 8:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-17 13:05 [PATCH] drivers/perf: hisi: Add identifier sysfs file John Garry
2020-06-18 1:39 ` Joakim Zhang
2020-06-18 1:40 ` Shaokun Zhang
2020-06-18 9:18 ` John Garry
2020-07-14 8:32 ` Will Deacon
2020-07-15 8:23 ` John Garry
2020-07-15 8:28 ` Joakim Zhang
2020-07-15 8:30 ` Will Deacon
2020-10-01 8:34 ` John Garry [this message]
2020-09-01 10:18 ` Joakim Zhang
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