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ACPI: processor: Use _OSC to convey OSPM processor support information

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Change acpi_early_processor_osc() to return a value in case of a
failure and make it static.

Also make it run acpi_processor_osc() for every processor object or
processor device found in the ACPI Namespace (previously, its only purpose
was to work around platform firmware defects on Skylake systems).

Introduce a new function called acpi_early_processor_control_setup() that
will invoke acpi_early_processor_osc() first in order to convey the OS
processor support information to the platform firmware and if that fails,
it will fall back to using _PDC.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[ rjw: Subject and changelog edits, change function return value to bool,
  add missing 'static', change messages ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Michal Wilczynski 2023-07-10 17:03:36 +03:00 committed by Rafael J. Wysocki
parent 5ba30be7fd
commit 9527264133
3 changed files with 29 additions and 20 deletions
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35
drivers/acpi/acpi_processor.c
View File

@ -624,16 +624,33 @@ static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
return AE_OK;
}
void __init acpi_early_processor_osc(void)
static bool __init acpi_early_processor_osc(void)
{
if (boot_cpu_has(X86_FEATURE_HWP)) {
acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX,
acpi_hwp_native_thermal_lvt_osc,
NULL, NULL, NULL);
acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
acpi_hwp_native_thermal_lvt_osc,
NULL, NULL);
acpi_status status;
acpi_proc_quirk_mwait_check();
status = acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, acpi_processor_osc, NULL,
NULL, NULL);
if (ACPI_FAILURE(status))
return false;
status = acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, acpi_processor_osc,
NULL, NULL);
if (ACPI_FAILURE(status))
return false;
return true;
}
void __init acpi_early_processor_control_setup(void)
{
if (acpi_early_processor_osc()) {
pr_info("_OSC evaluated successfully\n");
} else {
pr_info("_OSC evaluation failed, trying _PDC\n");
acpi_early_processor_set_pdc();
}
}
#endif

5
drivers/acpi/bus.c
View File

@ -1296,9 +1296,6 @@ static int __init acpi_bus_init(void)
goto error1;
}
/* Set capability bits for _OSC under processor scope */
acpi_early_processor_osc();
/*
* _OSC method may exist in module level code,
* so it must be run after ACPI_FULL_INITIALIZATION
@ -1314,7 +1311,7 @@ static int __init acpi_bus_init(void)
acpi_sysfs_init();
acpi_early_processor_set_pdc();
acpi_early_processor_control_setup();
/*
* Maybe EC region is required at bus_scan/acpi_get_devices. So it

9
drivers/acpi/internal.h
View File

@ -152,18 +152,13 @@ int acpi_wakeup_device_init(void);
Processor
-------------------------------------------------------------------------- */
#ifdef CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC
void acpi_early_processor_control_setup(void);
void acpi_early_processor_set_pdc(void);
void acpi_proc_quirk_mwait_check(void);
bool processor_physically_present(acpi_handle handle);
#else
static inline void acpi_early_processor_set_pdc(void) {}
#endif
#ifdef CONFIG_X86
void acpi_early_processor_osc(void);
#else
static inline void acpi_early_processor_osc(void) {}
static inline void acpi_early_processor_control_setup(void) {}
#endif
/* --------------------------------------------------------------------------