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ACPI: processor: Clear C_C2C3_FFH and C_C1_FFH in arch_acpi_set_proc_cap_bits()

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Currently arch_acpi_set_proc_cap_bits() clears ACPI_PDC_C_C2C3_FFH bit in
case MWAIT instruction is not supported.

It should also clear ACPI_PDC_C_C1_FFH, as when MWAIT is not supported,
C1 is entered by executing the HLT instruction.

Quote from the C_C1_FFH description:

"If set, OSPM is capable of performing native C State instructions (beyond
halt) for the C1 handler in multi-processor configurations". As without
MWAIT there is no native C-state instructions beyond HALT, this bit
should be toggled off."

Clear ACPI_PDC_C_C1_FFH and ACPI_PDC_C_C2C3_FFH in
arch_acpi_set_proc_cap_bits() in case MWAIT is not supported or
overridden.

Remove setting those bits from the processor_pdc.c code.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Michal Wilczynski 2023-07-10 17:03:33 +03:00 committed by Rafael J. Wysocki
parent c9e6c5e64f
commit 4f37ab5e05
2 changed files with 5 additions and 18 deletions
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9
arch/x86/include/asm/acpi.h
View file

@ -113,11 +113,12 @@ static inline void arch_acpi_set_proc_cap_bits(u32 *cap)
*cap |= ACPI_PROC_CAP_T_FFH;
/*
* If mwait/monitor is unsupported, C2/C3_FFH will be disabled
* If mwait/monitor is unsupported, C_C1_FFH and
* C2/C3_FFH will be disabled.
*/
if (!cpu_has(c, X86_FEATURE_MWAIT))
*cap &= ~(ACPI_PROC_CAP_C_C2C3_FFH);
if (!cpu_has(c, X86_FEATURE_MWAIT) ||
boot_option_idle_override == IDLE_NOMWAIT)
*cap &= ~(ACPI_PROC_CAP_C_C1_FFH | ACPI_PROC_CAP_C_C2C3_FFH);
}
static inline bool acpi_has_cpu_in_madt(void)

14
drivers/acpi/processor_pdc.c
View file

@ -74,20 +74,6 @@ acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
{
acpi_status status = AE_OK;
if (boot_option_idle_override == IDLE_NOMWAIT) {
/*
* If mwait is disabled for CPU C-states, the C2C3_FFH access
* mode will be disabled in the parameter of _PDC object.
* Of course C1_FFH access mode will also be disabled.
*/
union acpi_object *obj;
u32 *buffer = NULL;
obj = pdc_in->pointer;
buffer = (u32 *)(obj->buffer.pointer);
buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
}
status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
if (ACPI_FAILURE(status))