linux-kernel - Re: [PATCH v5 2/2] hwmon: (acpi_power_meter) Ensure IPMI space handler is ready on Dell systems

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Date: Wed, 20 Mar 2024 11:01:15 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc: rafael@...nel.org, lenb@...nel.org, jdelvare@...e.com,
	robert.moore@...el.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
	acpica-devel@...ts.linux.dev
Subject: Re: [PATCH v5 2/2] hwmon: (acpi_power_meter) Ensure IPMI space
 handler is ready on Dell systems

On Wed, Mar 20, 2024 at 04:43:17PM +0800, Kai-Heng Feng wrote:
> The following error can be observed at boot:
> [    3.717920] ACPI Error: No handler for Region [SYSI] (00000000ab9e62c5) [IPMI] (20230628/evregion-130)
> [    3.717928] ACPI Error: Region IPMI (ID=7) has no handler (20230628/exfldio-261)
> 
> [    3.717936] No Local Variables are initialized for Method [_GHL]
> 
> [    3.717938] No Arguments are initialized for method [_GHL]
> 
> [    3.717940] ACPI Error: Aborting method \_SB.PMI0._GHL due to previous error (AE_NOT_EXIST) (20230628/psparse-529)
> [    3.717949] ACPI Error: Aborting method \_SB.PMI0._PMC due to previous error (AE_NOT_EXIST) (20230628/psparse-529)
> [    3.717957] ACPI: \_SB_.PMI0: _PMC evaluation failed: AE_NOT_EXIST
> 
> On Dell systems several methods of acpi_power_meter access variables in
> IPMI region [0], so wait until IPMI space handler is installed by
> acpi_ipmi and also wait until SMI is selected to make the space handler
> fully functional.
> 
> Since the dependency is inside BIOS's ASL code and it's not
> discoverable, so use this fixup is a hack to workaround BIOS issue.
> 
> [0] https://www.dell.com/support/manuals/en-us/redhat-enterprise-linux-v8.0/rhel8_rn_pub/advanced-configuration-and-power-interface-acpi-error-messages-displayed-in-dmesg?guid=guid-0d5ae482-1977-42cf-b417-3ed5c3f5ee62
> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Applied to hwmon-next.

Please note that I'll push the branch after the commit window closed.

Thanks,
Guenter