linux-kernel - Re: [PATCH v3 1/4] Documentation: Add AMD Zen debugging document

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Message-ID: <Z_nMEwobMzGbG74L@archie.me>
Date: Sat, 12 Apr 2025 09:12:35 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Mario Limonciello <superm1@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Jean Delvare <jdelvare@...e.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Jonathan Corbet <corbet@....net>,
	Mario Limonciello <mario.limonciello@....com>,
	Yazen Ghannam <yazen.ghannam@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	Shyam Sundar S K <Shyam-sundar.S-k@....com>,
	Hans de Goede <hdegoede@...hat.com>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:I2C/SMBUS CONTROLLER DRIVERS FOR PC" <linux-i2c@...r.kernel.org>,
	"open list:AMD PMC DRIVER" <platform-driver-x86@...r.kernel.org>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>
Subject: Re: [PATCH v3 1/4] Documentation: Add AMD Zen debugging document

On Thu, Apr 10, 2025 at 03:01:59PM -0500, Mario Limonciello wrote:
> v3:
>  * Move debugging.rst to index.rst

Do you plan to add more AMD-specific admin docs in the future? (BTW, I don't
follow v2 discussions.)

> +As there are a lot of places that problems can occur, a debugging script has
> +been created that can help test for common problems and offer suggestions.
> +
> +https://git.kernel.org/pub/scm/linux/kernel/git/superm1/amd-debug-tools.git/tree/amd_s2idle.py
> +
> +If you have an s2idle issue, it's best to start with this and follow instructions
> +from its findings.  If you continue to have an issue, raise a bug with the
> +report generated from this script.

To mailing list following Documentation/admin-guide/reporting-issues.rst?

> +First convert the GPIO number into hex. ::
> +
> +  $ python3 -c "print(hex(59))"
> +  0x3b
> +
> +Next determine which ACPI table has the ``_EVT`` entry. For example: ::
> +
> +  $ sudo grep EVT /sys/firmware/acpi/tables/SSDT*
> +  grep: /sys/firmware/acpi/tables/SSDT27: binary file matches
> +
> +Decode this table:::
> +
> +  $ sudo cp /sys/firmware/acpi/tables/SSDT27 .
> +  $ sudo iasl -d SSDT27

Nit: two colons are sufficient for literal code-block.

> +To activate PM debugging, use the kernel command line option: ``pm_debug_messages``.
> +
> +Or enable the feature using the sysfs file: ``/sys/power/pm_debug_messages``
> +Constraints that are not met will be displayed in the kernel log and can be
> +viewed using anything that processes the kernel ring buffer such as ``dmesg``` or
> +``journalctl``.

"To activate PM debugging, either specify ``pm_debug_messagess`` kernel
command-line option at boot or write to ``/sys/power/pm_debug_messages``.
Unmet constraints will be displayed in the kernel log and can be
viewed by logging tools that process kernel ring buffer like dmesg or
journalctl."

> +`patch <https://lore.kernel.org/amd-gfx/20250305051402.1550046-3-chiahsuan.chung@amd.com/T/#u>`_

What about that patchset status? It was not reviewed by upstream maintainers,
right?

Thanks.

--
An old man doll... just what I always wanted! - Clara

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