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From: Sudeep Holla <sudeep.holla@arm.com>
To: John Garry <john.garry@huawei.com>
Cc: rjw@rjwysocki.net, lenb@kernel.org, jeremy.linton@arm.com,
	arnd@arndb.de, olof@lixom.net, linux-kernel@vger.kernel.org,
	linux-acpi@vger.kernel.org, guohanjun@huawei.com,
	gregkh@linuxfoundation.org, Sudeep Holla <sudeep.holla@arm.com>
Subject: Re: [PATCH RFC 1/2] ACPI/PPTT: Add acpi_pptt_get_package_info() API
Date: Tue, 28 Jan 2020 12:34:15 +0000	[thread overview]
Message-ID: <20200128123415.GB36168@bogus> (raw)
In-Reply-To: <1580210059-199540-2-git-send-email-john.garry@huawei.com>

On Tue, Jan 28, 2020 at 07:14:18PM +0800, John Garry wrote:
> The ACPI PPTT ID structure (see 6.2 spec, section 5.2.29.3) allows the
> vendor to provide an identifier (or vendor specific part number) for a
> particular processor hierarchy node structure. That may be a processor
> identifier for a processor node, or some chip identifier for a processor
> package node.
>

Unfortunately, there were plans to deprecate this in favour of the new
SOC_ID SMCCC API[1]. I am not sure if you or anyone in your company have
access to UEFI ASWG mantis where you can look for the ECR for the PPTT
Type 2 deprecation. I understand it's not ideal, but we need to converge,
please take a look at both before further discussion.

I personally would not prefer to add the support when I know it is getting
deprecated. I am not sure on kernel community policy on the same.


[...]

>
> The ID structure table has a number of fields, which are left open to
> interpretation per implementation. However the spec does provide reference
> examples of how the fields could be used. As such, just provide the
> table fields directly in the API, which the caller may interpret (probably
> as per spec example).
>

The "open for interpretation" part is why it's not being favoured anymore
by silicon vendors as OEM/ODMs can override the same.

> https://lore.kernel.org/linux-arm-kernel/1579876505-113251-6-git-send-email-john.garry@huawei.com/
>
Ah, there's already quite a lot of dependency built for this feature :(

--
Regards,
Sudeep

[1] https://developer.arm.com/docs/den0028/c

  reply	other threads:[~2020-01-28 12:34 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-28 11:14 [PATCH RFC 0/2] Add basic generic ACPI soc driver John Garry
2020-01-28 11:14 ` [PATCH RFC 1/2] ACPI/PPTT: Add acpi_pptt_get_package_info() API John Garry
2020-01-28 12:34   ` Sudeep Holla [this message]
2020-01-28 14:04     ` John Garry
2020-01-28 14:54       ` Sudeep Holla
2020-01-29 11:03         ` John Garry
2020-01-30 11:23     ` Sudeep Holla
2020-01-30 16:12       ` John Garry
2020-01-30 17:41         ` Sudeep Holla
2020-01-31 10:58           ` John Garry
2020-01-28 11:14 ` [PATCH RFC 2/2] soc: Add a basic ACPI generic driver John Garry
2020-01-28 11:56   ` Greg KH
2020-01-28 13:33     ` John Garry
2020-01-28 12:50   ` Arnd Bergmann
2020-01-28 14:46     ` John Garry
2020-01-28 15:20   ` Sudeep Holla
2020-01-28 15:59     ` John Garry
2020-01-28 16:17       ` Sudeep Holla
2020-01-28 17:51   ` Olof Johansson
2020-01-28 18:22     ` John Garry
2020-01-28 19:11       ` Rafael J. Wysocki
2020-01-28 19:28         ` John Garry
2020-01-28 22:30           ` Rafael J. Wysocki
2020-01-29 10:27             ` John Garry
2020-01-28 20:06       ` Olof Johansson
2020-01-29  9:58         ` John Garry
2020-01-28 16:56 ` [PATCH RFC 0/2] Add basic generic ACPI soc driver Jeremy Linton
2020-01-28 17:28   ` John Garry
2020-01-28 19:04     ` Jeremy Linton
2020-01-28 20:07       ` John Garry

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