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ACPI/processor_idle: Add FFH state handling

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Recent Intel platforms will depend on the idle driver to pass the
correct hint for playing dead via mwait_play_dead_with_hint(). Expand
the existing enter_dead interface with handling for FFH states and pass
the MWAIT hint to the mwait_play_dead code.

Suggested-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Patryk Wlazlyn <patryk.wlazlyn@linux.intel.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/all/20250205155211.329780-3-artem.bityutskiy%40linux.intel.com
This commit is contained in:
Patryk Wlazlyn 2025-02-05 17:52:09 +02:00 committed by Dave Hansen
parent a7dd183f0b
commit 541ddf31e3
3 changed files with 17 additions and 0 deletions
arch/x86/kernel/acpi
cstate.c
drivers/acpi
processor_idle.c
include/acpi
processor.h

10
arch/x86/kernel/acpi/cstate.c

@ -16,6 +16,7 @@
#include <asm/cpuid.h>
#include <asm/mwait.h>
#include <asm/special_insns.h>
#include <asm/smp.h>
/*
* Initialize bm_flags based on the CPU cache properties
@ -205,6 +206,15 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu,
}
EXPORT_SYMBOL_GPL(acpi_processor_ffh_cstate_probe);
void acpi_processor_ffh_play_dead(struct acpi_processor_cx *cx)
{
unsigned int cpu = smp_processor_id();
struct cstate_entry *percpu_entry;
percpu_entry = per_cpu_ptr(cpu_cstate_entry, cpu);
mwait_play_dead(percpu_entry->states[cx->index].eax);
}
void __cpuidle acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cx)
{
unsigned int cpu = smp_processor_id();

2
drivers/acpi/processor_idle.c

@ -590,6 +590,8 @@ static void acpi_idle_play_dead(struct cpuidle_device *dev, int index)
raw_safe_halt();
else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
io_idle(cx->address);
} else if (cx->entry_method == ACPI_CSTATE_FFH) {
acpi_processor_ffh_play_dead(cx);
} else
return;
}

5
include/acpi/processor.h

@ -280,6 +280,7 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu,
struct acpi_processor_cx *cx,
struct acpi_power_register *reg);
void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
void acpi_processor_ffh_play_dead(struct acpi_processor_cx *cx);
#else
static inline void acpi_processor_power_init_bm_check(struct
acpi_processor_flags
@ -300,6 +301,10 @@ static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
{
return;
}
static inline void acpi_processor_ffh_play_dead(struct acpi_processor_cx *cx)
{
return;
}
#endif
static inline int call_on_cpu(int cpu, long (*fn)(void *), void *arg,