intel_idle: Allow ACPI _CST to be used for selected known processors
Update the intel_idle driver to get the C-states information from ACPI _CST in some cases in which the processor is known to the driver, as long as that information is available and the new use_acpi flag is set in the profile of the processor in question. In the cases when there is a specific table of C-states for the given processor in the driver, that table is used as the primary source of information on the available C-states, but if ACPI _CST is present, the C-states that are not listed by it will not be enabled by default (they still can be enabled later by user space via sysfs, though). The new CPUIDLE_FLAG_ALWAYS_ENABLE flag can be used for marking C-states that should be enabled by default even if they are not listed by ACPI _CST. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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75a8026741
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@ -80,6 +80,7 @@ struct idle_cpu {
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unsigned long auto_demotion_disable_flags;
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bool byt_auto_demotion_disable_flag;
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bool disable_promotion_to_c1e;
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bool use_acpi;
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};
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static const struct idle_cpu *icpu;
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@ -90,6 +91,11 @@ static void intel_idle_s2idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index);
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static struct cpuidle_state *cpuidle_state_table;
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/*
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* Enable this state by default even if the ACPI _CST does not list it.
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*/
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#define CPUIDLE_FLAG_ALWAYS_ENABLE BIT(15)
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/*
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* Set this flag for states where the HW flushes the TLB for us
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* and so we don't need cross-calls to keep it consistent.
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@ -1230,9 +1236,33 @@ static void intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
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state->enter_s2idle = intel_idle_s2idle;
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}
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}
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static bool intel_idle_off_by_default(u32 mwait_hint)
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{
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int cstate, limit;
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/*
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* If there are no _CST C-states, do not disable any C-states by
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* default.
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*/
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if (!acpi_state_table.count)
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return false;
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limit = min_t(int, CPUIDLE_STATE_MAX, acpi_state_table.count);
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/*
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* If limit > 0, intel_idle_cst_usable() has returned 'true', so all of
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* the interesting states are ACPI_CSTATE_FFH.
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*/
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for (cstate = 1; cstate < limit; cstate++) {
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if (acpi_state_table.states[cstate].address == mwait_hint)
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return false;
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}
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return true;
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}
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#else /* !CONFIG_ACPI_PROCESSOR_CSTATE */
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static inline bool intel_idle_acpi_cst_extract(void) { return false; }
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static inline void intel_idle_init_cstates_acpi(struct cpuidle_driver *drv) { }
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static inline bool intel_idle_off_by_default(u32 mwait_hint) { return false; }
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#endif /* !CONFIG_ACPI_PROCESSOR_CSTATE */
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/*
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@ -1273,10 +1303,13 @@ static int __init intel_idle_probe(void)
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pr_debug("MWAIT substates: 0x%x\n", mwait_substates);
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icpu = (const struct idle_cpu *)id->driver_data;
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if (icpu)
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if (icpu) {
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cpuidle_state_table = icpu->state_table;
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else if (!intel_idle_acpi_cst_extract())
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if (icpu->use_acpi)
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intel_idle_acpi_cst_extract();
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} else if (!intel_idle_acpi_cst_extract()) {
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return -ENODEV;
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}
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pr_debug("v" INTEL_IDLE_VERSION " model 0x%X\n",
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boot_cpu_data.x86_model);
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@ -1484,7 +1517,13 @@ static void intel_idle_init_cstates_icpu(struct cpuidle_driver *drv)
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continue;
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/* Structure copy. */
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drv->states[drv->state_count++] = cpuidle_state_table[cstate];
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drv->states[drv->state_count] = cpuidle_state_table[cstate];
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if (icpu->use_acpi && intel_idle_off_by_default(mwait_hint) &&
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!(cpuidle_state_table[cstate].flags & CPUIDLE_FLAG_ALWAYS_ENABLE))
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drv->states[drv->state_count].flags |= CPUIDLE_FLAG_OFF;
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drv->state_count++;
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}
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if (icpu->byt_auto_demotion_disable_flag) {
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