linux/drivers/base
Mario Limonciello b79276dcac ACPI: processor: Move arch_init_invariance_cppc() call later
arch_init_invariance_cppc() is called at the end of
acpi_cppc_processor_probe() in order to configure frequency invariance
based upon the values from _CPC.

This however doesn't work on AMD CPPC shared memory designs that have
AMD preferred cores enabled because _CPC needs to be analyzed from all
cores to judge if preferred cores are enabled.

This issue manifests to users as a warning since commit 21fb59ab4b
("ACPI: CPPC: Adjust debug messages in amd_set_max_freq_ratio() to warn"):
```
Could not retrieve highest performance (-19)
```

However the warning isn't the cause of this, it was actually
commit 279f838a61 ("x86/amd: Detect preferred cores in
amd_get_boost_ratio_numerator()") which exposed the issue.

To fix this problem, change arch_init_invariance_cppc() into a new weak
symbol that is called at the end of acpi_processor_driver_init().
Each architecture that supports it can declare the symbol to override
the weak one.

Define it for x86, in arch/x86/kernel/acpi/cppc.c, and for all of the
architectures using the generic arch_topology.c code.

Fixes: 279f838a61 ("x86/amd: Detect preferred cores in amd_get_boost_ratio_numerator()")
Reported-by: Ivan Shapovalov <intelfx@intelfx.name>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219431
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://patch.msgid.link/20241104222855.3959267-1-superm1@kernel.org
[ rjw: Changelog edit ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2024-11-06 21:31:36 +01:00
..
firmware_loader
power PM: domains: Fix alloc/free in dev_pm_domain_attach|detach_list() 2024-10-10 13:55:17 +02:00
regmap move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
test
Kconfig
Makefile
arch_numa.c
arch_topology.c ACPI: processor: Move arch_init_invariance_cppc() call later 2024-11-06 21:31:36 +01:00
attribute_container.c
auxiliary.c
auxiliary_sysfs.c
base.h Revert "driver core: shut down devices asynchronously" 2024-09-25 11:01:27 +02:00
bus.c
cacheinfo.c
class.c
component.c
container.c
core.c Driver core revert fix for 6.12-rc6 2024-11-03 08:51:53 -10:00
cpu.c
dd.c Driver core update for 6.12-rc1 2024-09-27 08:48:37 -07:00
devcoredump.c
devres.c
devtmpfs.c
driver.c
firmware.c
hypervisor.c
init.c
isa.c
map.c
memory.c
module.c Revert "driver core: Fix uevent_show() vs driver detach race" 2024-10-29 01:23:43 +01:00
node.c
physical_location.c
physical_location.h
pinctrl.c
platform-msi.c
platform.c
property.c
soc.c
swnode.c
syscore.c
topology.c
trace.c
trace.h
transport_class.c