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intel_idle: Prepare for adding ACPI _LPI support

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In preparation for adding ACPI _LPI support to intel_idle, move some
code used for processing ACPI idle states information coming from
_CST objects to separate functions because that code will be also
used for processing idle states information coming from _LPI.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/1932965.atdPhlSkOF@rafael.j.wysocki
This commit is contained in:
Rafael J. Wysocki 2026-07-09 14:43:43 +02:00
parent 67fcf679c8
commit 4d7821961f
1 changed files with 22 additions and 13 deletions
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35
drivers/idle/intel_idle.c
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@ -1837,6 +1837,16 @@ static bool __init intel_idle_acpi_cst_extract(void)
return false;
}
static void __init intel_idle_complete_state_init(struct cpuidle_state *state)
{
if (intel_idle_state_needs_timer_stop(state))
state->flags |= CPUIDLE_FLAG_TIMER_STOP;
state->enter = intel_idle;
state->enter_dead = intel_idle_enter_dead;
state->enter_s2idle = intel_idle_s2idle;
}
static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
{
int cstate, limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count);
@ -1879,18 +1889,23 @@ static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
if (disabled_states_mask & BIT(cstate))
state->flags |= CPUIDLE_FLAG_OFF;
if (intel_idle_state_needs_timer_stop(state))
state->flags |= CPUIDLE_FLAG_TIMER_STOP;
if (cx->type > ACPI_STATE_C1 && !boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
mark_tsc_unstable("TSC halts in idle");
state->enter = intel_idle;
state->enter_dead = intel_idle_enter_dead;
state->enter_s2idle = intel_idle_s2idle;
intel_idle_complete_state_init(state);
}
}
static bool __init intel_idle_acpi_hint_match(unsigned int flags, u32 acpi_hint,
u32 table_hint)
{
if (flags & CPUIDLE_FLAG_PARTIAL_HINT_MATCH) {
acpi_hint &= ~MWAIT_SUBSTATE_MASK;
table_hint &= ~MWAIT_SUBSTATE_MASK;
}
return acpi_hint == table_hint;
}
static bool __init intel_idle_off_by_default(unsigned int flags, u32 mwait_hint)
{
int cstate, limit;
@ -1909,14 +1924,8 @@ static bool __init intel_idle_off_by_default(unsigned int flags, u32 mwait_hint)
*/
for (cstate = 1; cstate < limit; cstate++) {
u32 acpi_hint = acpi_state_table.states[cstate].address;
u32 table_hint = mwait_hint;
if (flags & CPUIDLE_FLAG_PARTIAL_HINT_MATCH) {
acpi_hint &= ~MWAIT_SUBSTATE_MASK;
table_hint &= ~MWAIT_SUBSTATE_MASK;
}
if (acpi_hint == table_hint)
if (intel_idle_acpi_hint_match(flags, acpi_hint, mwait_hint))
return false;
}
return true;