From 4dcb78ee579cdf90e30c5a0223f6f160ea37182d Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 3 Feb 2020 11:57:18 +0100 Subject: [PATCH] intel_idle: Introduce 'states_off' module parameter In certain system configurations it may not be desirable to use some C-states assumed to be available by intel_idle and the driver needs to be prevented from using them even before the cpuidle sysfs interface becomes accessible to user space. Currently, the only way to achieve that is by setting the 'max_cstate' module parameter to a value lower than the index of the shallowest of the C-states in question, but that may be overly intrusive, because it effectively makes all of the idle states deeper than the 'max_cstate' one go away (and the C-state to avoid may be in the middle of the range normally regarded as available). To allow that limitation to be overcome, introduce a new module parameter called 'states_off' to represent a list of idle states to be disabled by default in the form of a bitmask and update the documentation to cover it. Signed-off-by: Rafael J. Wysocki --- Documentation/admin-guide/pm/intel_idle.rst | 19 ++++++++++++++++++- drivers/idle/intel_idle.c | 23 ++++++++++++++++++++--- 2 files changed, 38 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/pm/intel_idle.rst b/Documentation/admin-guide/pm/intel_idle.rst index 8998598..89309e1 100644 --- a/Documentation/admin-guide/pm/intel_idle.rst +++ b/Documentation/admin-guide/pm/intel_idle.rst @@ -168,7 +168,7 @@ and ``idle=nomwait``. If any of them is present in the kernel command line, the ``MWAIT`` instruction is not allowed to be used, so the initialization of ``intel_idle`` will fail. -Apart from that there are three module parameters recognized by ``intel_idle`` +Apart from that there are four module parameters recognized by ``intel_idle`` itself that can be set via the kernel command line (they cannot be updated via sysfs, so that is the only way to change their values). @@ -195,6 +195,23 @@ driver ignore the system's ACPI tables entirely or use them for all of the recognized processor models, respectively (they both are unset by default and ``use_acpi`` has no effect if ``no_acpi`` is set). +The value of the ``states_off`` module parameter (0 by default) represents a +list of idle states to be disabled by default in the form of a bitmask. + +Namely, the positions of the bits that are set in the ``states_off`` value are +the indices of idle states to be disabled by default (as reflected by the names +of the corresponding idle state directories in ``sysfs``, :file:`state0`, +:file:`state1` ... :file:`state` ..., where ```` is the index of the given +idle state; see :ref:`idle-states-representation` in :doc:`cpuidle`). + +For example, if ``states_off`` is equal to 3, the driver will disable idle +states 0 and 1 by default, and if it is equal to 8, idle state 3 will be +disabled by default and so on (bit positions beyond the maximum idle state index +are ignored). + +The idle states disabled this way can be enabled (on a per-CPU basis) from user +space via ``sysfs``. + .. _intel-idle-core-and-package-idle-states: diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 6fbd94f..d556066 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -63,6 +63,7 @@ static struct cpuidle_driver intel_idle_driver = { }; /* intel_idle.max_cstate=0 disables driver */ static int max_cstate = CPUIDLE_STATE_MAX - 1; +static unsigned int disabled_states_mask; static unsigned int mwait_substates; @@ -1234,6 +1235,9 @@ static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) if (cx->type > ACPI_STATE_C2) state->flags |= CPUIDLE_FLAG_TLB_FLUSHED; + if (disabled_states_mask & BIT(cstate)) + state->flags |= CPUIDLE_FLAG_OFF; + state->enter = intel_idle; state->enter_s2idle = intel_idle_s2idle; } @@ -1466,9 +1470,10 @@ 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 || force_use_acpi) && - intel_idle_off_by_default(mwait_hint) && - !(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE)) + if ((disabled_states_mask & BIT(drv->state_count)) || + ((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; drv->state_count++; @@ -1487,6 +1492,10 @@ static void __init intel_idle_init_cstates_icpu(struct cpuidle_driver *drv) static void __init intel_idle_cpuidle_driver_init(struct cpuidle_driver *drv) { cpuidle_poll_state_init(drv); + + if (disabled_states_mask & BIT(0)) + drv->states[0].flags |= CPUIDLE_FLAG_OFF; + drv->state_count = 1; if (icpu) @@ -1667,3 +1676,11 @@ device_initcall(intel_idle_init); * is the easiest way (currently) to continue doing that. */ module_param(max_cstate, int, 0444); +/* + * The positions of the bits that are set in this number are the indices of the + * idle states to be disabled by default (as reflected by the names of the + * corresponding idle state directories in sysfs, "state0", "state1" ... + * "state" ..., where is the index of the given state). + */ +module_param_named(states_off, disabled_states_mask, uint, 0444); +MODULE_PARM_DESC(states_off, "Mask of disabled idle states"); -- 2.7.4