[PATCH v3 2/2] hwmon: (acpi_power_meter) Ensure IPMI space handler is ready on Dell systems

[PATCH v3 2/2] hwmon: (acpi_power_meter) Ensure IPMI space handler is ready on Dell systems

[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.

[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@canonical.com>
---
v3:
 - Use helper.
 - Use return value to print warning message.

v2:
 - Use completion instead of request_module().

 drivers/hwmon/acpi_power_meter.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 703666b95bf4..33fb9626633d 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -883,6 +883,12 @@ 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)) {
+		if (acpi_wait_for_acpi_ipmi())
+			dev_warn(&device->dev, "Waiting for ACPI IPMI timeout");
+	}
+
 	res = read_capabilities(resource);
 	if (res)
 		goto exit_free;
-- 
2.34.1

Re: [PATCH v3 2/2] hwmon: (acpi_power_meter) Ensure IPMI space handler is ready on Dell systems

[kernel test robot]

Hi Kai-Heng,

kernel test robot noticed the following build errors:

[auto build test ERROR on rafael-pm/linux-next]
[also build test ERROR on groeck-staging/hwmon-next rafael-pm/acpi-bus rafael-pm/devprop linus/master v6.7-rc8 next-20240104]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kai-Heng-Feng/hwmon-acpi_power_meter-Ensure-IPMI-space-handler-is-ready-on-Dell-systems/20240104-105227
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/20240104024819.848979-2-kai.heng.feng%40canonical.com
patch subject: [PATCH v3 2/2] hwmon: (acpi_power_meter) Ensure IPMI space handler is ready on Dell systems
config: i386-randconfig-r133-20240104 (https://download.01.org/0day-ci/archive/20240105/202401051544.T4aBavV5-lkp@intel.com/config)
compiler: ClangBuiltLinux clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240105/202401051544.T4aBavV5-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401051544.T4aBavV5-lkp@intel.com/

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: acpi_wait_for_acpi_ipmi
   >>> referenced by acpi_power_meter.c:888 (drivers/hwmon/acpi_power_meter.c:888)
   >>>               drivers/hwmon/acpi_power_meter.o:(acpi_power_meter_add) in archive vmlinux.a

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki