^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * processor_idle - idle state submodule to the ACPI processor driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2004, 2005 Dominik Brodowski <linux@brodo.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * - Added processor hotplug support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * - Added support for C3 on SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define pr_fmt(fmt) "ACPI: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/dmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/sched.h> /* need_resched() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/sort.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/tick.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/cpuidle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <acpi/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * Include the apic definitions for x86 to have the APIC timer related defines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * available also for UP (on SMP it gets magically included via linux/smp.h).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * asm/acpi.h is not an option, as it would require more include magic. Also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * creating an empty asm-ia64/apic.h would just trade pest vs. cholera.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #ifdef CONFIG_X86
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/apic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define ACPI_PROCESSOR_CLASS "processor"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define _COMPONENT ACPI_PROCESSOR_COMPONENT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) ACPI_MODULE_NAME("processor_idle");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define ACPI_IDLE_STATE_START (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX) ? 1 : 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) module_param(max_cstate, uint, 0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static unsigned int nocst __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) module_param(nocst, uint, 0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static int bm_check_disable __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) module_param(bm_check_disable, uint, 0000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static unsigned int latency_factor __read_mostly = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) module_param(latency_factor, uint, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static DEFINE_PER_CPU(struct cpuidle_device *, acpi_cpuidle_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct cpuidle_driver acpi_idle_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) .name = "acpi_idle",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #ifdef CONFIG_ACPI_PROCESSOR_CSTATE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) DEFINE_PER_CPU(struct acpi_processor_cx * [CPUIDLE_STATE_MAX], acpi_cstate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static int disabled_by_idle_boot_param(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return boot_option_idle_override == IDLE_POLL ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) boot_option_idle_override == IDLE_HALT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * For now disable this. Probably a bug somewhere else.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * To skip this limit, boot/load with a large max_cstate limit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static int set_max_cstate(const struct dmi_system_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) pr_notice("%s detected - limiting to C%ld max_cstate."
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) " Override with \"processor.max_cstate=%d\"\n", id->ident,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) (long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) max_cstate = (long)id->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static const struct dmi_system_id processor_power_dmi_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) { set_max_cstate, "Clevo 5600D", {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) (void *)2},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) { set_max_cstate, "Pavilion zv5000", {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) (void *)1},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) { set_max_cstate, "Asus L8400B", {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) (void *)1},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * Callers should disable interrupts before the call and enable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * interrupts after return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static void __cpuidle acpi_safe_halt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (!tif_need_resched()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) safe_halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) #ifdef ARCH_APICTIMER_STOPS_ON_C3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * Some BIOS implementations switch to C3 in the published C2 state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * This seems to be a common problem on AMD boxen, but other vendors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * are affected too. We pick the most conservative approach: we assume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * that the local APIC stops in both C2 and C3.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static void lapic_timer_check_state(int state, struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct acpi_processor_cx *cx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct acpi_processor_power *pwr = &pr->power;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (boot_cpu_has_bug(X86_BUG_AMD_APIC_C1E))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) type = ACPI_STATE_C1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * Check, if one of the previous states already marked the lapic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * unstable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (pwr->timer_broadcast_on_state < state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (cx->type >= type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) pr->power.timer_broadcast_on_state = state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static void __lapic_timer_propagate_broadcast(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct acpi_processor *pr = (struct acpi_processor *) arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (pr->power.timer_broadcast_on_state < INT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) tick_broadcast_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) tick_broadcast_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static void lapic_timer_propagate_broadcast(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) (void *)pr, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* Power(C) State timer broadcast control */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static bool lapic_timer_needs_broadcast(struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct acpi_processor_cx *cx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return cx - pr->power.states >= pr->power.timer_broadcast_on_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static void lapic_timer_check_state(int state, struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) struct acpi_processor_cx *cstate) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static bool lapic_timer_needs_broadcast(struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct acpi_processor_cx *cx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) #if defined(CONFIG_X86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static void tsc_check_state(int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) switch (boot_cpu_data.x86_vendor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) case X86_VENDOR_HYGON:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) case X86_VENDOR_AMD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) case X86_VENDOR_INTEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) case X86_VENDOR_CENTAUR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) case X86_VENDOR_ZHAOXIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * AMD Fam10h TSC will tick in all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * C/P/S0/S1 states when this bit is set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /* TSC could halt in idle, so notify users */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (state > ACPI_STATE_C1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) mark_tsc_unstable("TSC halts in idle");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static void tsc_check_state(int state) { return; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (!pr->pblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /* if info is obtained from pblk/fadt, type equals state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) #ifndef CONFIG_HOTPLUG_CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * Check for P_LVL2_UP flag before entering C2 and above on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * an SMP system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if ((num_online_cpus() > 1) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* determine C2 and C3 address from pblk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /* determine latencies from FADT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.c2_latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.c3_latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * FADT specified C2 latency must be less than or equal to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * 100 microseconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (acpi_gbl_FADT.c2_latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) "C2 latency too large [%d]\n", acpi_gbl_FADT.c2_latency));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /* invalidate C2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) pr->power.states[ACPI_STATE_C2].address = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * FADT supplied C3 latency must be less than or equal to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * 1000 microseconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (acpi_gbl_FADT.c3_latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) "C3 latency too large [%d]\n", acpi_gbl_FADT.c3_latency));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) /* invalidate C3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) pr->power.states[ACPI_STATE_C3].address = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) "lvl2[0x%08x] lvl3[0x%08x]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) pr->power.states[ACPI_STATE_C2].address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) pr->power.states[ACPI_STATE_C3].address));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) snprintf(pr->power.states[ACPI_STATE_C2].desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) ACPI_CX_DESC_LEN, "ACPI P_LVL2 IOPORT 0x%x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) pr->power.states[ACPI_STATE_C2].address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) snprintf(pr->power.states[ACPI_STATE_C3].desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) ACPI_CX_DESC_LEN, "ACPI P_LVL3 IOPORT 0x%x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) pr->power.states[ACPI_STATE_C3].address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (!pr->power.states[ACPI_STATE_C1].valid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* set the first C-State to C1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /* all processors need to support C1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) pr->power.states[ACPI_STATE_C1].valid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) snprintf(pr->power.states[ACPI_STATE_C1].desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) ACPI_CX_DESC_LEN, "ACPI HLT");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /* the C0 state only exists as a filler in our array */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) pr->power.states[ACPI_STATE_C0].valid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (nocst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) ret = acpi_processor_evaluate_cst(pr->handle, pr->id, &pr->power);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) if (!pr->power.count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) pr->flags.has_cst = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) struct acpi_processor_cx *cx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) static int bm_check_flag = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static int bm_control_flag = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (!cx->address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) * PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * DMA transfers are used by any ISA device to avoid livelock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) * Note that we could disable Type-F DMA (as recommended by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * the erratum), but this is known to disrupt certain ISA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * devices thus we take the conservative approach.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) else if (errata.piix4.fdma) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) "C3 not supported on PIIX4 with Type-F DMA\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /* All the logic here assumes flags.bm_check is same across all CPUs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (bm_check_flag == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /* Determine whether bm_check is needed based on CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) bm_check_flag = pr->flags.bm_check;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) bm_control_flag = pr->flags.bm_control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) pr->flags.bm_check = bm_check_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) pr->flags.bm_control = bm_control_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (pr->flags.bm_check) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (!pr->flags.bm_control) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (pr->flags.has_cst != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /* bus mastering control is necessary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) "C3 support requires BM control\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) /* Here we enter C3 without bus mastering */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) "C3 support without BM control\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) * WBINVD should be set in fadt, for C3 state to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * supported on when bm_check is not required.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) ACPI_DEBUG_PRINT((ACPI_DB_INFO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) "Cache invalidation should work properly"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) " for C3 to be enabled on SMP systems\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * Otherwise we've met all of our C3 requirements.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * Normalize the C3 latency to expidite policy. Enable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * checking of bus mastering status (bm_check) so we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * use this in our C3 policy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) cx->valid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * On older chipsets, BM_RLD needs to be set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * in order for Bus Master activity to wake the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * system from C3. Newer chipsets handle DMA
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) * during C3 automatically and BM_RLD is a NOP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * In either case, the proper way to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * handle BM_RLD is to set it and leave it set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static int acpi_cst_latency_cmp(const void *a, const void *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) const struct acpi_processor_cx *x = a, *y = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (!(x->valid && y->valid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (x->latency > y->latency)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) if (x->latency < y->latency)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) static void acpi_cst_latency_swap(void *a, void *b, int n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct acpi_processor_cx *x = a, *y = b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) u32 tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) if (!(x->valid && y->valid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) tmp = x->latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) x->latency = y->latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) y->latency = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) static int acpi_processor_power_verify(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) unsigned int working = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) unsigned int last_latency = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) unsigned int last_type = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) bool buggy_latency = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) pr->power.timer_broadcast_on_state = INT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) struct acpi_processor_cx *cx = &pr->power.states[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) switch (cx->type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) case ACPI_STATE_C1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) cx->valid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) case ACPI_STATE_C2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) if (!cx->address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) cx->valid = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) case ACPI_STATE_C3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) acpi_processor_power_verify_c3(pr, cx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (!cx->valid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) if (cx->type >= last_type && cx->latency < last_latency)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) buggy_latency = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) last_latency = cx->latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) last_type = cx->type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) lapic_timer_check_state(i, pr, cx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) tsc_check_state(cx->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) working++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if (buggy_latency) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) pr_notice("FW issue: working around C-state latencies out of order\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) sort(&pr->power.states[1], max_cstate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) sizeof(struct acpi_processor_cx),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) acpi_cst_latency_cmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) acpi_cst_latency_swap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) lapic_timer_propagate_broadcast(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) return (working);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) /* NOTE: the idle thread may not be running while calling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) * this function */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) /* Zero initialize all the C-states info. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) memset(pr->power.states, 0, sizeof(pr->power.states));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) result = acpi_processor_get_power_info_cst(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (result == -ENODEV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) result = acpi_processor_get_power_info_fadt(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) acpi_processor_get_power_info_default(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) pr->power.count = acpi_processor_power_verify(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) * if one state of type C2 or C3 is available, mark this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) * CPU as being "idle manageable"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) if (pr->power.states[i].valid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) pr->power.count = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) pr->flags.power = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) * acpi_idle_bm_check - checks if bus master activity was detected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) static int acpi_idle_bm_check(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) u32 bm_status = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (bm_check_disable)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) if (bm_status)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) * PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) * the true state of bus mastering activity; forcing us to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) * manually check the BMIDEA bit of each IDE channel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) else if (errata.piix4.bmisx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) || (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) bm_status = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) return bm_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) static void wait_for_freeze(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) #ifdef CONFIG_X86
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) /* No delay is needed if we are in guest */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) /* Dummy wait op - must do something useless after P_LVL2 read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) because chipsets cannot guarantee that STPCLK# signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) gets asserted in time to freeze execution properly. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) inl(acpi_gbl_FADT.xpm_timer_block.address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) * acpi_idle_do_entry - enter idle state using the appropriate method
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) * @cx: cstate data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) * Caller disables interrupt before call and enables interrupt after return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) static void __cpuidle acpi_idle_do_entry(struct acpi_processor_cx *cx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (cx->entry_method == ACPI_CSTATE_FFH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) /* Call into architectural FFH based C-state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) acpi_processor_ffh_cstate_enter(cx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) } else if (cx->entry_method == ACPI_CSTATE_HALT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) acpi_safe_halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) /* IO port based C-state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) inb(cx->address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) wait_for_freeze();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) * @dev: the target CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) * @index: the index of suggested state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) ACPI_FLUSH_CPU_CACHE();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) if (cx->entry_method == ACPI_CSTATE_HALT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) safe_halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) inb(cx->address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) wait_for_freeze();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) #if defined(CONFIG_X86) && defined(CONFIG_HOTPLUG_CPU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) cond_wakeup_cpu0();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) /* Never reached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) static bool acpi_idle_fallback_to_c1(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return IS_ENABLED(CONFIG_HOTPLUG_CPU) && !pr->flags.has_cst &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) !(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) static int c3_cpu_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) static DEFINE_RAW_SPINLOCK(c3_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) * acpi_idle_enter_bm - enters C3 with proper BM handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * @drv: cpuidle driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) * @pr: Target processor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) * @cx: Target state context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) * @index: index of target state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) static int acpi_idle_enter_bm(struct cpuidle_driver *drv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) struct acpi_processor_cx *cx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) static struct acpi_processor_cx safe_cx = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) .entry_method = ACPI_CSTATE_HALT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) * disable bus master
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * bm_check implies we need ARB_DIS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) * bm_control implies whether we can do ARB_DIS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) * That leaves a case where bm_check is set and bm_control is not set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) * In that case we cannot do much, we enter C3 without doing anything.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) bool dis_bm = pr->flags.bm_control;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) /* If we can skip BM, demote to a safe state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if (!cx->bm_sts_skip && acpi_idle_bm_check()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) dis_bm = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) index = drv->safe_state_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) if (index >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) cx = this_cpu_read(acpi_cstate[index]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) cx = &safe_cx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) index = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) if (dis_bm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) raw_spin_lock(&c3_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) c3_cpu_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) /* Disable bus master arbitration when all CPUs are in C3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) if (c3_cpu_count == num_online_cpus())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) raw_spin_unlock(&c3_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) rcu_idle_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) acpi_idle_do_entry(cx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) rcu_idle_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) /* Re-enable bus master arbitration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) if (dis_bm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) raw_spin_lock(&c3_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) c3_cpu_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) raw_spin_unlock(&c3_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) return index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) static int acpi_idle_enter(struct cpuidle_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) struct cpuidle_driver *drv, int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) struct acpi_processor *pr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) pr = __this_cpu_read(processors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) if (unlikely(!pr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) if (cx->type != ACPI_STATE_C1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (cx->type == ACPI_STATE_C3 && pr->flags.bm_check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) return acpi_idle_enter_bm(drv, pr, cx, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) /* C2 to C1 demotion. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) if (acpi_idle_fallback_to_c1(pr) && num_online_cpus() > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) index = ACPI_IDLE_STATE_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) cx = per_cpu(acpi_cstate[index], dev->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) if (cx->type == ACPI_STATE_C3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) ACPI_FLUSH_CPU_CACHE();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) acpi_idle_do_entry(cx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) return index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) static int acpi_idle_enter_s2idle(struct cpuidle_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) struct cpuidle_driver *drv, int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) if (cx->type == ACPI_STATE_C3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) struct acpi_processor *pr = __this_cpu_read(processors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) if (unlikely(!pr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) if (pr->flags.bm_check) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) u8 bm_sts_skip = cx->bm_sts_skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) /* Don't check BM_STS, do an unconditional ARB_DIS for S2IDLE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) cx->bm_sts_skip = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) acpi_idle_enter_bm(drv, pr, cx, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) cx->bm_sts_skip = bm_sts_skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) ACPI_FLUSH_CPU_CACHE();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) acpi_idle_do_entry(cx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) struct cpuidle_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) int i, count = ACPI_IDLE_STATE_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) struct acpi_processor_cx *cx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) struct cpuidle_state *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) if (max_cstate == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) max_cstate = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) state = &acpi_idle_driver.states[count];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) cx = &pr->power.states[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) if (!cx->valid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) per_cpu(acpi_cstate[count], dev->cpu) = cx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) if (lapic_timer_needs_broadcast(pr, cx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) state->flags |= CPUIDLE_FLAG_TIMER_STOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) if (cx->type == ACPI_STATE_C3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) state->flags |= CPUIDLE_FLAG_TLB_FLUSHED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) if (pr->flags.bm_check)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) state->flags |= CPUIDLE_FLAG_RCU_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) if (count == CPUIDLE_STATE_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) if (!count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) static int acpi_processor_setup_cstates(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) int i, count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) struct acpi_processor_cx *cx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) struct cpuidle_state *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) struct cpuidle_driver *drv = &acpi_idle_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if (max_cstate == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) max_cstate = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if (IS_ENABLED(CONFIG_ARCH_HAS_CPU_RELAX)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) cpuidle_poll_state_init(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) count = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) cx = &pr->power.states[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) if (!cx->valid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) state = &drv->states[count];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) state->exit_latency = cx->latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) state->target_residency = cx->latency * latency_factor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) state->enter = acpi_idle_enter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) state->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) if (cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) state->enter_dead = acpi_idle_play_dead;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) drv->safe_state_index = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) * Halt-induced C1 is not good for ->enter_s2idle, because it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) * re-enables interrupts on exit. Moreover, C1 is generally not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * particularly interesting from the suspend-to-idle angle, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) * avoid C1 and the situations in which we may need to fall back
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) * to it altogether.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) if (cx->type != ACPI_STATE_C1 && !acpi_idle_fallback_to_c1(pr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) state->enter_s2idle = acpi_idle_enter_s2idle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) if (count == CPUIDLE_STATE_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) drv->state_count = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) if (!count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) static inline void acpi_processor_cstate_first_run_checks(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) static int first_run;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) if (first_run)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) dmi_check_system(processor_power_dmi_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) max_cstate = acpi_processor_cstate_check(max_cstate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) if (max_cstate < ACPI_C_STATES_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) pr_notice("ACPI: processor limited to max C-state %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) max_cstate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) first_run++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) if (nocst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) acpi_processor_claim_cst_control();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) static inline int disabled_by_idle_boot_param(void) { return 0; }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) static inline void acpi_processor_cstate_first_run_checks(void) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) struct cpuidle_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) static int acpi_processor_setup_cstates(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) #endif /* CONFIG_ACPI_PROCESSOR_CSTATE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) struct acpi_lpi_states_array {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) unsigned int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) unsigned int composite_states_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) struct acpi_lpi_state *entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) struct acpi_lpi_state *composite_states[ACPI_PROCESSOR_MAX_POWER];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) static int obj_get_integer(union acpi_object *obj, u32 *value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) if (obj->type != ACPI_TYPE_INTEGER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) *value = obj->integer.value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) static int acpi_processor_evaluate_lpi(acpi_handle handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) struct acpi_lpi_states_array *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) int pkg_count, state_idx = 1, loop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) union acpi_object *lpi_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) struct acpi_lpi_state *lpi_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) status = acpi_evaluate_object(handle, "_LPI", NULL, &buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _LPI, giving up\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) lpi_data = buffer.pointer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) /* There must be at least 4 elements = 3 elements + 1 package */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) if (!lpi_data || lpi_data->type != ACPI_TYPE_PACKAGE ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) lpi_data->package.count < 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) pr_debug("not enough elements in _LPI\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) ret = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) pkg_count = lpi_data->package.elements[2].integer.value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) /* Validate number of power states. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) if (pkg_count < 1 || pkg_count != lpi_data->package.count - 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) pr_debug("count given by _LPI is not valid\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) ret = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) lpi_state = kcalloc(pkg_count, sizeof(*lpi_state), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) if (!lpi_state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) goto end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) info->size = pkg_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) info->entries = lpi_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) /* LPI States start at index 3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) for (loop = 3; state_idx <= pkg_count; loop++, state_idx++, lpi_state++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) union acpi_object *element, *pkg_elem, *obj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) element = &lpi_data->package.elements[loop];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) if (element->type != ACPI_TYPE_PACKAGE || element->package.count < 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) pkg_elem = element->package.elements;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) obj = pkg_elem + 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) if (obj->type == ACPI_TYPE_BUFFER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) struct acpi_power_register *reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) reg = (struct acpi_power_register *)obj->buffer.pointer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) lpi_state->address = reg->address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) lpi_state->entry_method =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) ACPI_CSTATE_FFH : ACPI_CSTATE_SYSTEMIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) } else if (obj->type == ACPI_TYPE_INTEGER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) lpi_state->entry_method = ACPI_CSTATE_INTEGER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) lpi_state->address = obj->integer.value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) /* elements[7,8] skipped for now i.e. Residency/Usage counter*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) obj = pkg_elem + 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) if (obj->type == ACPI_TYPE_STRING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) strlcpy(lpi_state->desc, obj->string.pointer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) ACPI_CX_DESC_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) lpi_state->index = state_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) if (obj_get_integer(pkg_elem + 0, &lpi_state->min_residency)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) pr_debug("No min. residency found, assuming 10 us\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) lpi_state->min_residency = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) if (obj_get_integer(pkg_elem + 1, &lpi_state->wake_latency)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) pr_debug("No wakeup residency found, assuming 10 us\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) lpi_state->wake_latency = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) if (obj_get_integer(pkg_elem + 2, &lpi_state->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) lpi_state->flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) if (obj_get_integer(pkg_elem + 3, &lpi_state->arch_flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) lpi_state->arch_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) if (obj_get_integer(pkg_elem + 4, &lpi_state->res_cnt_freq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) lpi_state->res_cnt_freq = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) if (obj_get_integer(pkg_elem + 5, &lpi_state->enable_parent_state))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) lpi_state->enable_parent_state = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) acpi_handle_debug(handle, "Found %d power states\n", state_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) end:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) kfree(buffer.pointer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) * flat_state_cnt - the number of composite LPI states after the process of flattening
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) static int flat_state_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) * combine_lpi_states - combine local and parent LPI states to form a composite LPI state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) * @local: local LPI state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) * @parent: parent LPI state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) * @result: composite LPI state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) static bool combine_lpi_states(struct acpi_lpi_state *local,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) struct acpi_lpi_state *parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) struct acpi_lpi_state *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) if (parent->entry_method == ACPI_CSTATE_INTEGER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) if (!parent->address) /* 0 means autopromotable */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) result->address = local->address + parent->address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) result->address = parent->address;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) result->min_residency = max(local->min_residency, parent->min_residency);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) result->wake_latency = local->wake_latency + parent->wake_latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) result->enable_parent_state = parent->enable_parent_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) result->entry_method = local->entry_method;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) result->flags = parent->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) result->arch_flags = parent->arch_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) result->index = parent->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) strlcpy(result->desc, local->desc, ACPI_CX_DESC_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) strlcat(result->desc, "+", ACPI_CX_DESC_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) strlcat(result->desc, parent->desc, ACPI_CX_DESC_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) #define ACPI_LPI_STATE_FLAGS_ENABLED BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) static void stash_composite_state(struct acpi_lpi_states_array *curr_level,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) struct acpi_lpi_state *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) curr_level->composite_states[curr_level->composite_states_size++] = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) static int flatten_lpi_states(struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) struct acpi_lpi_states_array *curr_level,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) struct acpi_lpi_states_array *prev_level)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) int i, j, state_count = curr_level->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) struct acpi_lpi_state *p, *t = curr_level->entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) curr_level->composite_states_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) for (j = 0; j < state_count; j++, t++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) struct acpi_lpi_state *flpi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) if (!(t->flags & ACPI_LPI_STATE_FLAGS_ENABLED))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) if (flat_state_cnt >= ACPI_PROCESSOR_MAX_POWER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) pr_warn("Limiting number of LPI states to max (%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) ACPI_PROCESSOR_MAX_POWER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) pr_warn("Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) flpi = &pr->power.lpi_states[flat_state_cnt];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) if (!prev_level) { /* leaf/processor node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) memcpy(flpi, t, sizeof(*t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) stash_composite_state(curr_level, flpi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) flat_state_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) for (i = 0; i < prev_level->composite_states_size; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) p = prev_level->composite_states[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) if (t->index <= p->enable_parent_state &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) combine_lpi_states(p, t, flpi)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) stash_composite_state(curr_level, flpi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) flat_state_cnt++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) flpi++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) kfree(curr_level->entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) int ret, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) acpi_handle handle = pr->handle, pr_ahandle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) struct acpi_device *d = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) struct acpi_lpi_states_array info[2], *tmp, *prev, *curr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) if (!osc_pc_lpi_support_confirmed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) if (!acpi_has_method(handle, "_LPI"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) flat_state_cnt = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) prev = &info[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) curr = &info[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) handle = pr->handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) ret = acpi_processor_evaluate_lpi(handle, prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) flatten_lpi_states(pr, prev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) status = acpi_get_parent(handle, &pr_ahandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) while (ACPI_SUCCESS(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) acpi_bus_get_device(pr_ahandle, &d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) handle = pr_ahandle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) /* can be optional ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) if (!acpi_has_method(handle, "_LPI"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) ret = acpi_processor_evaluate_lpi(handle, curr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) /* flatten all the LPI states in this level of hierarchy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) flatten_lpi_states(pr, curr, prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) tmp = prev, prev = curr, curr = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) status = acpi_get_parent(handle, &pr_ahandle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) pr->power.count = flat_state_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) /* reset the index after flattening */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) for (i = 0; i < pr->power.count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) pr->power.lpi_states[i].index = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) /* Tell driver that _LPI is supported. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) pr->flags.has_lpi = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) pr->flags.power = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) int __weak acpi_processor_ffh_lpi_probe(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) int __weak acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) * acpi_idle_lpi_enter - enters an ACPI any LPI state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) * @dev: the target CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) * @drv: cpuidle driver containing cpuidle state info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) * @index: index of target state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) * Return: 0 for success or negative value for error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) static int acpi_idle_lpi_enter(struct cpuidle_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) struct cpuidle_driver *drv, int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) struct acpi_processor *pr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) struct acpi_lpi_state *lpi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) pr = __this_cpu_read(processors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) if (unlikely(!pr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) lpi = &pr->power.lpi_states[index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) if (lpi->entry_method == ACPI_CSTATE_FFH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) return acpi_processor_ffh_lpi_enter(lpi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) struct acpi_lpi_state *lpi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) struct cpuidle_state *state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) struct cpuidle_driver *drv = &acpi_idle_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) if (!pr->flags.has_lpi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) for (i = 0; i < pr->power.count && i < CPUIDLE_STATE_MAX; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) lpi = &pr->power.lpi_states[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) state = &drv->states[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) snprintf(state->name, CPUIDLE_NAME_LEN, "LPI-%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) strlcpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) state->exit_latency = lpi->wake_latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) state->target_residency = lpi->min_residency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) if (lpi->arch_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) state->flags |= CPUIDLE_FLAG_TIMER_STOP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) state->enter = acpi_idle_lpi_enter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) drv->safe_state_index = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) drv->state_count = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) * acpi_processor_setup_cpuidle_states- prepares and configures cpuidle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) * global state data i.e. idle routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) * @pr: the ACPI processor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) struct cpuidle_driver *drv = &acpi_idle_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) if (!pr->flags.power_setup_done || !pr->flags.power)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) drv->safe_state_index = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) for (i = ACPI_IDLE_STATE_START; i < CPUIDLE_STATE_MAX; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) drv->states[i].name[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) drv->states[i].desc[0] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) if (pr->flags.has_lpi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) return acpi_processor_setup_lpi_states(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) return acpi_processor_setup_cstates(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) * acpi_processor_setup_cpuidle_dev - prepares and configures CPUIDLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) * device i.e. per-cpu data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) * @pr: the ACPI processor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) * @dev : the cpuidle device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) static int acpi_processor_setup_cpuidle_dev(struct acpi_processor *pr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) struct cpuidle_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) if (!pr->flags.power_setup_done || !pr->flags.power || !dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) dev->cpu = pr->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) if (pr->flags.has_lpi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) return acpi_processor_ffh_lpi_probe(pr->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) return acpi_processor_setup_cpuidle_cx(pr, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) static int acpi_processor_get_power_info(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) ret = acpi_processor_get_lpi_info(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) ret = acpi_processor_get_cstate_info(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) int acpi_processor_hotplug(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) struct cpuidle_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) if (disabled_by_idle_boot_param())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) if (!pr->flags.power_setup_done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) dev = per_cpu(acpi_cpuidle_device, pr->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) cpuidle_pause_and_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) cpuidle_disable_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) ret = acpi_processor_get_power_info(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) if (!ret && pr->flags.power) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) acpi_processor_setup_cpuidle_dev(pr, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) ret = cpuidle_enable_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) cpuidle_resume_and_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) struct acpi_processor *_pr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) struct cpuidle_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) if (disabled_by_idle_boot_param())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) if (!pr->flags.power_setup_done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) * FIXME: Design the ACPI notification to make it once per
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) * system instead of once per-cpu. This condition is a hack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) * to make the code that updates C-States be called once.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) if (pr->id == 0 && cpuidle_get_driver() == &acpi_idle_driver) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) /* Protect against cpu-hotplug */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) get_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) cpuidle_pause_and_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) /* Disable all cpuidle devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) for_each_online_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) _pr = per_cpu(processors, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) if (!_pr || !_pr->flags.power_setup_done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) dev = per_cpu(acpi_cpuidle_device, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) cpuidle_disable_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) /* Populate Updated C-state information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) acpi_processor_get_power_info(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) acpi_processor_setup_cpuidle_states(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) /* Enable all cpuidle devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) for_each_online_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) _pr = per_cpu(processors, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) if (!_pr || !_pr->flags.power_setup_done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) acpi_processor_get_power_info(_pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) if (_pr->flags.power) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) dev = per_cpu(acpi_cpuidle_device, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) acpi_processor_setup_cpuidle_dev(_pr, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) cpuidle_enable_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) cpuidle_resume_and_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) put_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) static int acpi_processor_registered;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) int acpi_processor_power_init(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) struct cpuidle_device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) if (disabled_by_idle_boot_param())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) acpi_processor_cstate_first_run_checks();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) if (!acpi_processor_get_power_info(pr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) pr->flags.power_setup_done = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) * Install the idle handler if processor power management is supported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) * Note that we use previously set idle handler will be used on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) * platforms that only support C1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) if (pr->flags.power) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) /* Register acpi_idle_driver if not already registered */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) if (!acpi_processor_registered) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) acpi_processor_setup_cpuidle_states(pr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) retval = cpuidle_register_driver(&acpi_idle_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) pr_debug("%s registered with cpuidle\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) acpi_idle_driver.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) dev = kzalloc(sizeof(*dev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) per_cpu(acpi_cpuidle_device, pr->id) = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) acpi_processor_setup_cpuidle_dev(pr, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) /* Register per-cpu cpuidle_device. Cpuidle driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) * must already be registered before registering device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) retval = cpuidle_register_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) if (acpi_processor_registered == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) cpuidle_unregister_driver(&acpi_idle_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) acpi_processor_registered++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) int acpi_processor_power_exit(struct acpi_processor *pr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) if (disabled_by_idle_boot_param())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) if (pr->flags.power) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) cpuidle_unregister_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) acpi_processor_registered--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) if (acpi_processor_registered == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) cpuidle_unregister_driver(&acpi_idle_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) pr->flags.power_setup_done = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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