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| author |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-02-03 11:57:08 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-02-03 11:57:08 +0100 |
| commit | 3a5be9b8f43346a24f31c0017cb2566a6b2c72c5 (patch) | |
| tree | 346315651d61e9e5ee7e7263a76dff66e5346db8 /drivers/idle | |
| parent | Merge tag 'pm-5.6-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm (diff) | |
| download | linux-dev-3a5be9b8f43346a24f31c0017cb2566a6b2c72c5.tar.xz linux-dev-3a5be9b8f43346a24f31c0017cb2566a6b2c72c5.zip | |
intel_idle: Introduce 'use_acpi' module parameter
For diagnostics, it is generally useful to be able to make intel_idle
take the system's ACPI tables into consideration even if that is not
required for the processor model in there, so introduce a new module
parameter, 'use_acpi', to make that happen and update the documentation
to cover it.
While at it, fix the 'no_acpi' module parameter name in the
documentation.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/idle')
| -rw-r--r-- | drivers/idle/intel_idle.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 7833e650789f..6fbd94f85fa5 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -1131,6 +1131,10 @@ static bool no_acpi __read_mostly; module_param(no_acpi, bool, 0444); MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list"); +static bool force_use_acpi __read_mostly; /* No effect if no_acpi is set. */ +module_param_named(use_acpi, force_use_acpi, bool, 0444); +MODULE_PARM_DESC(use_acpi, "Use ACPI _CST for building the idle states list"); + static struct acpi_processor_power acpi_state_table __initdata; /** @@ -1258,6 +1262,8 @@ static bool __init intel_idle_off_by_default(u32 mwait_hint) return true; } #else /* !CONFIG_ACPI_PROCESSOR_CSTATE */ +#define force_use_acpi (false) + static inline bool intel_idle_acpi_cst_extract(void) { return false; } static inline void intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) { } static inline bool intel_idle_off_by_default(u32 mwait_hint) { return false; } @@ -1460,7 +1466,8 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv) /* Structure copy. */ drv->states[drv->state_count] = cpuidle_state_table[cstate]; - if (icpu->use_acpi && intel_idle_off_by_default(mwait_hint) && + if ((icpu->use_acpi || force_use_acpi) && + intel_idle_off_by_default(mwait_hint) && !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE)) drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF; @@ -1607,7 +1614,7 @@ static int __init intel_idle_init(void) icpu = (const struct idle_cpu *)id->driver_data; if (icpu) { cpuidle_state_table = icpu->state_table; - if (icpu->use_acpi) + if (icpu->use_acpi || force_use_acpi) intel_idle_acpi_cst_extract(); } else if (!intel_idle_acpi_cst_extract()) { return -ENODEV; |