^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * acpi_pad.c ACPI Processor Aggregator Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2009, Intel Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/cpumask.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <uapi/linux/sched/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/freezer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/tick.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/mwait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <xen/xen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define ACPI_PROCESSOR_AGGREGATOR_CLASS "acpi_pad"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define ACPI_PROCESSOR_AGGREGATOR_NOTIFY 0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static DEFINE_MUTEX(isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static DEFINE_MUTEX(round_robin_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static unsigned long power_saving_mwait_eax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static unsigned char tsc_detected_unstable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static unsigned char tsc_marked_unstable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static void power_saving_mwait_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) unsigned int eax, ebx, ecx, edx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) unsigned int highest_cstate = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) unsigned int highest_subcstate = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if (!boot_cpu_has(X86_FEATURE_MWAIT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) !(ecx & CPUID5_ECX_INTERRUPT_BREAK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) edx >>= MWAIT_SUBSTATE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) for (i = 0; i < 7 && edx; i++, edx >>= MWAIT_SUBSTATE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (edx & MWAIT_SUBSTATE_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) highest_cstate = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) highest_subcstate = edx & MWAIT_SUBSTATE_MASK;
^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) power_saving_mwait_eax = (highest_cstate << MWAIT_SUBSTATE_SIZE) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) (highest_subcstate - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #if defined(CONFIG_X86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) switch (boot_cpu_data.x86_vendor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) case X86_VENDOR_HYGON:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) case X86_VENDOR_AMD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) case X86_VENDOR_INTEL:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) case X86_VENDOR_ZHAOXIN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * AMD Fam10h TSC will tick in all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * C/P/S0/S1 states when this bit is set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) tsc_detected_unstable = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /* TSC could halt in idle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) tsc_detected_unstable = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static unsigned long cpu_weight[NR_CPUS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int tsk_in_cpu[NR_CPUS] = {[0 ... NR_CPUS-1] = -1};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static DECLARE_BITMAP(pad_busy_cpus_bits, NR_CPUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static void round_robin_cpu(unsigned int tsk_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct cpumask *pad_busy_cpus = to_cpumask(pad_busy_cpus_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) cpumask_var_t tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) unsigned long min_weight = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unsigned long preferred_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (!alloc_cpumask_var(&tmp, GFP_KERNEL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) mutex_lock(&round_robin_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) cpumask_clear(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) for_each_cpu(cpu, pad_busy_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) cpumask_or(tmp, tmp, topology_sibling_cpumask(cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) cpumask_andnot(tmp, cpu_online_mask, tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* avoid HT sibilings if possible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (cpumask_empty(tmp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) cpumask_andnot(tmp, cpu_online_mask, pad_busy_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (cpumask_empty(tmp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) mutex_unlock(&round_robin_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) free_cpumask_var(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) for_each_cpu(cpu, tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (cpu_weight[cpu] < min_weight) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) min_weight = cpu_weight[cpu];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) preferred_cpu = cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (tsk_in_cpu[tsk_index] != -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) cpumask_clear_cpu(tsk_in_cpu[tsk_index], pad_busy_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) tsk_in_cpu[tsk_index] = preferred_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) cpumask_set_cpu(preferred_cpu, pad_busy_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) cpu_weight[preferred_cpu]++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) mutex_unlock(&round_robin_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) set_cpus_allowed_ptr(current, cpumask_of(preferred_cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) free_cpumask_var(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static void exit_round_robin(unsigned int tsk_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct cpumask *pad_busy_cpus = to_cpumask(pad_busy_cpus_bits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) cpumask_clear_cpu(tsk_in_cpu[tsk_index], pad_busy_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) tsk_in_cpu[tsk_index] = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static unsigned int idle_pct = 5; /* percentage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static unsigned int round_robin_time = 1; /* second */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static int power_saving_thread(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) int do_sleep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) unsigned int tsk_index = (unsigned long)data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) u64 last_jiffies = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) sched_set_fifo_low(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) while (!kthread_should_stop()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) unsigned long expire_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* round robin to cpus */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) expire_time = last_jiffies + round_robin_time * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (time_before(expire_time, jiffies)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) last_jiffies = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) round_robin_cpu(tsk_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) do_sleep = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) expire_time = jiffies + HZ * (100 - idle_pct) / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) while (!need_resched()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (tsc_detected_unstable && !tsc_marked_unstable) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /* TSC could halt in idle, so notify users */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) mark_tsc_unstable("TSC halts in idle");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) tsc_marked_unstable = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) tick_broadcast_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) tick_broadcast_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) stop_critical_timings();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) mwait_idle_with_hints(power_saving_mwait_eax, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) start_critical_timings();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) tick_broadcast_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) local_irq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (time_before(expire_time, jiffies)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) do_sleep = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * current sched_rt has threshold for rt task running time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * When a rt task uses 95% CPU time, the rt thread will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * scheduled out for 5% CPU time to not starve other tasks. But
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * the mechanism only works when all CPUs have RT task running,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * as if one CPU hasn't RT task, RT task from other CPUs will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * borrow CPU time from this CPU and cause RT task use > 95%
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * CPU time. To make 'avoid starvation' work, takes a nap here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (unlikely(do_sleep))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) schedule_timeout_killable(HZ * idle_pct / 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) /* If an external event has set the need_resched flag, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * we need to deal with it, or this loop will continue to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * spin without calling __mwait().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (unlikely(need_resched()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) exit_round_robin(tsk_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static struct task_struct *ps_tsks[NR_CPUS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) static unsigned int ps_tsk_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static int create_power_saving_task(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) ps_tsks[ps_tsk_num] = kthread_run(power_saving_thread,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) (void *)(unsigned long)ps_tsk_num,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) "acpi_pad/%d", ps_tsk_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (IS_ERR(ps_tsks[ps_tsk_num])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) rc = PTR_ERR(ps_tsks[ps_tsk_num]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ps_tsks[ps_tsk_num] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) ps_tsk_num++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) static void destroy_power_saving_task(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (ps_tsk_num > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) ps_tsk_num--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) kthread_stop(ps_tsks[ps_tsk_num]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ps_tsks[ps_tsk_num] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static void set_power_saving_task_num(unsigned int num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (num > ps_tsk_num) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) while (ps_tsk_num < num) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (create_power_saving_task())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) } else if (num < ps_tsk_num) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) while (ps_tsk_num > num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) destroy_power_saving_task();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static void acpi_pad_idle_cpus(unsigned int num_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) get_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) num_cpus = min_t(unsigned int, num_cpus, num_online_cpus());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) set_power_saving_task_num(num_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) put_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static uint32_t acpi_pad_idle_cpus_num(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return ps_tsk_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static ssize_t rrtime_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct device_attribute *attr, const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) unsigned long num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (kstrtoul(buf, 0, &num))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) if (num < 1 || num >= 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) mutex_lock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) round_robin_time = num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) mutex_unlock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static ssize_t rrtime_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return scnprintf(buf, PAGE_SIZE, "%d\n", round_robin_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static DEVICE_ATTR_RW(rrtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) static ssize_t idlepct_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) struct device_attribute *attr, const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) unsigned long num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (kstrtoul(buf, 0, &num))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (num < 1 || num >= 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) mutex_lock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) idle_pct = num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) mutex_unlock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static ssize_t idlepct_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return scnprintf(buf, PAGE_SIZE, "%d\n", idle_pct);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static DEVICE_ATTR_RW(idlepct);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static ssize_t idlecpus_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct device_attribute *attr, const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) unsigned long num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (kstrtoul(buf, 0, &num))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) mutex_lock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) acpi_pad_idle_cpus(num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) mutex_unlock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) static ssize_t idlecpus_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) return cpumap_print_to_pagebuf(false, buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) to_cpumask(pad_busy_cpus_bits));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) static DEVICE_ATTR_RW(idlecpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static int acpi_pad_add_sysfs(struct acpi_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) result = device_create_file(&device->dev, &dev_attr_idlecpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) result = device_create_file(&device->dev, &dev_attr_idlepct);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) if (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) device_remove_file(&device->dev, &dev_attr_idlecpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) result = device_create_file(&device->dev, &dev_attr_rrtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) if (result) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) device_remove_file(&device->dev, &dev_attr_idlecpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) device_remove_file(&device->dev, &dev_attr_idlepct);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static void acpi_pad_remove_sysfs(struct acpi_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) device_remove_file(&device->dev, &dev_attr_idlecpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) device_remove_file(&device->dev, &dev_attr_idlepct);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) device_remove_file(&device->dev, &dev_attr_rrtime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * Query firmware how many CPUs should be idle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * return -1 on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) static int acpi_pad_pur(acpi_handle handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) union acpi_object *package;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) int num = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) if (ACPI_FAILURE(acpi_evaluate_object(handle, "_PUR", NULL, &buffer)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) return num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (!buffer.length || !buffer.pointer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) package = buffer.pointer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) if (package->type == ACPI_TYPE_PACKAGE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) package->package.count == 2 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) package->package.elements[0].integer.value == 1) /* rev 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) num = package->package.elements[1].integer.value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) kfree(buffer.pointer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) static void acpi_pad_handle_notify(acpi_handle handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) int num_cpus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) uint32_t idle_cpus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) struct acpi_buffer param = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) .length = 4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) .pointer = (void *)&idle_cpus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) mutex_lock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) num_cpus = acpi_pad_pur(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (num_cpus < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) mutex_unlock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) acpi_pad_idle_cpus(num_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) idle_cpus = acpi_pad_idle_cpus_num();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) acpi_evaluate_ost(handle, ACPI_PROCESSOR_AGGREGATOR_NOTIFY, 0, ¶m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) mutex_unlock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) static void acpi_pad_notify(acpi_handle handle, u32 event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct acpi_device *device = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) switch (event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) case ACPI_PROCESSOR_AGGREGATOR_NOTIFY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) acpi_pad_handle_notify(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) acpi_bus_generate_netlink_event(device->pnp.device_class,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) dev_name(&device->dev), event, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) pr_warn("Unsupported event [0x%x]\n", event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) static int acpi_pad_add(struct acpi_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) acpi_status status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) strcpy(acpi_device_name(device), ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) strcpy(acpi_device_class(device), ACPI_PROCESSOR_AGGREGATOR_CLASS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (acpi_pad_add_sysfs(device))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) status = acpi_install_notify_handler(device->handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) ACPI_DEVICE_NOTIFY, acpi_pad_notify, device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (ACPI_FAILURE(status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) acpi_pad_remove_sysfs(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) static int acpi_pad_remove(struct acpi_device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) mutex_lock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) acpi_pad_idle_cpus(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) mutex_unlock(&isolated_cpus_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) acpi_remove_notify_handler(device->handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) ACPI_DEVICE_NOTIFY, acpi_pad_notify);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) acpi_pad_remove_sysfs(device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) static const struct acpi_device_id pad_device_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) {"ACPI000C", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) {"", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) MODULE_DEVICE_TABLE(acpi, pad_device_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) static struct acpi_driver acpi_pad_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) .name = "processor_aggregator",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) .class = ACPI_PROCESSOR_AGGREGATOR_CLASS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) .ids = pad_device_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) .ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) .add = acpi_pad_add,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) .remove = acpi_pad_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static int __init acpi_pad_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) /* Xen ACPI PAD is used when running as Xen Dom0. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) if (xen_initial_domain())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) power_saving_mwait_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (power_saving_mwait_eax == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return acpi_bus_register_driver(&acpi_pad_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) static void __exit acpi_pad_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) acpi_bus_unregister_driver(&acpi_pad_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) module_init(acpi_pad_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) module_exit(acpi_pad_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) MODULE_AUTHOR("Shaohua Li<shaohua.li@intel.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) MODULE_DESCRIPTION("ACPI Processor Aggregator Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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