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Date: Thu, 4 Jan 2024 08:11:07 +0100
From: Armin Wolf <W_Armin@....de>
To: Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc: jdelvare@...e.com, linux@...ck-us.net,
"Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
Robert Moore <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 v2] hwmon: (acpi_power_meter) Ensure IPMI space handler is
ready on Dell systems
Am 04.01.24 um 03:14 schrieb Kai-Heng Feng:
> On Thu, Jan 4, 2024 at 5:23 AM Armin Wolf <W_Armin@....de> wrote:
>> Am 27.12.23 um 05:04 schrieb Kai-Heng Feng:
>>
>>> 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.
>> Hi,
>>
>> could it be that the ACPI firmware expects us to support the ACPI SPMI table?
>> The ACPI SPMI table contains a description of the IPMI interface used by the platform,
>> and its purpose seems to be similar to the ACPI ECDT table in that it allows the OS
>> to access IPMI resources before all ACPI namespaces are enumerated.
>>
>> Adding support for this table would solve this problem without stalling the boot
>> process by waiting for the ACPI IPMI device to probe. It would also avoid any issues
>> should the ACPI IPMI device be removed later.
> Hi, the ACPI firmware on the system doesn't have SPMI table:
> $ ls /sys/firmware/acpi/tables/
> APIC BERT data DMAR DSDT dynamic EINJ ERST FACP FACS HEST
> HMAT HPET MCFG MIGT MSCT NBFT OEM4 SLIC SLIT SRAT SSDT1
> SSDT2 SSDT3 SSDT4 SSDT5 SSDT6 TPM2 UEFI1 UEFI2 VFCT WSMT
>
> Kai-Heng
Thanks for checking this, in this case you might ignore my suggestion above.
Armin Wolf
>> Armin Wolf
>>
>>> [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>
>>> ---
>>> v2:
>>> - Use completion instead of request_module().
>>>
>>> drivers/acpi/acpi_ipmi.c | 13 ++++++++++++-
>>> drivers/hwmon/acpi_power_meter.c | 4 ++++
>>> include/acpi/acpi_bus.h | 4 ++++
>>> 3 files changed, 20 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/acpi/acpi_ipmi.c b/drivers/acpi/acpi_ipmi.c
>>> index 0555f68c2dfd..2ea8b7e6cebf 100644
>>> --- a/drivers/acpi/acpi_ipmi.c
>>> +++ b/drivers/acpi/acpi_ipmi.c
>>> @@ -23,6 +23,8 @@ MODULE_LICENSE("GPL");
>>> #define IPMI_TIMEOUT (5000)
>>> #define ACPI_IPMI_MAX_MSG_LENGTH 64
>>>
>>> +static struct completion smi_selected;
>>> +
>>> struct acpi_ipmi_device {
>>> /* the device list attached to driver_data.ipmi_devices */
>>> struct list_head head;
>>> @@ -463,8 +465,10 @@ static void ipmi_register_bmc(int iface, struct device *dev)
>>> if (temp->handle == handle)
>>> goto err_lock;
>>> }
>>> - if (!driver_data.selected_smi)
>>> + if (!driver_data.selected_smi) {
>>> driver_data.selected_smi = ipmi_device;
>>> + complete(&smi_selected);
>>> + }
>>> list_add_tail(&ipmi_device->head, &driver_data.ipmi_devices);
>>> mutex_unlock(&driver_data.ipmi_lock);
>>>
>>> @@ -578,10 +582,17 @@ acpi_ipmi_space_handler(u32 function, acpi_physical_address address,
>>> return status;
>>> }
>>>
>>> +void wait_for_acpi_ipmi(void)
>>> +{
>>> + wait_for_completion_interruptible_timeout(&smi_selected, 2 * HZ);
>>> +}
>>> +EXPORT_SYMBOL_GPL(wait_for_acpi_ipmi);
>>> +
>>> static int __init acpi_ipmi_init(void)
>>> {
>>> int result;
>>> acpi_status status;
>>> + init_completion(&smi_selected);
>>>
>>> if (acpi_disabled)
>>> return 0;
>>> diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
>>> index 703666b95bf4..acaf1ae68dc8 100644
>>> --- a/drivers/hwmon/acpi_power_meter.c
>>> +++ b/drivers/hwmon/acpi_power_meter.c
>>> @@ -883,6 +883,10 @@ static int acpi_power_meter_add(struct acpi_device *device)
>>> strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
>>> device->driver_data = resource;
>>>
>>> + if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.") &&
>>> + acpi_dev_get_first_match_dev("IPI0001", NULL, -1))
>>> + wait_for_acpi_ipmi();
>>> +
>>> res = read_capabilities(resource);
>>> if (res)
>>> goto exit_free;
>>> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
>>> index 1216d72c650f..ed59fb89721e 100644
>>> --- a/include/acpi/acpi_bus.h
>>> +++ b/include/acpi/acpi_bus.h
>>> @@ -655,6 +655,7 @@ bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *s
>>> bool acpi_quirk_skip_acpi_ac_and_battery(void);
>>> int acpi_install_cmos_rtc_space_handler(acpi_handle handle);
>>> void acpi_remove_cmos_rtc_space_handler(acpi_handle handle);
>>> +void wait_for_acpi_ipmi(void);
>>> #else
>>> static inline bool acpi_device_override_status(struct acpi_device *adev,
>>> unsigned long long *status)
>>> @@ -672,6 +673,9 @@ static inline int acpi_install_cmos_rtc_space_handler(acpi_handle handle)
>>> static inline void acpi_remove_cmos_rtc_space_handler(acpi_handle handle)
>>> {
>>> }
>>> +static inline void wait_for_acpi_ipmi(void)
>>> +{
>>> +}
>>> #endif
>>>
>>> #if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
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