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bfcef4ab1d
In cases like suspend-to-disk and suspend-to-ram, a large number of CPU cores need to be shut down. At present, the CPU hotplug operation is serialised, and the CPU cores can only be shut down one by one. In this process, if PSCI affinity_info() does not return LEVEL_OFF quickly, cpu_psci_cpu_kill() needs to wait for 10ms. If hundreds of CPU cores need to be shut down, it will take a long time. Normally, there is no need to wait 10ms in cpu_psci_cpu_kill(). So change the wait interval from 10 ms to max 1 ms and use usleep_range() instead of msleep() for more accurate timer. In addition, reducing the time interval will increase the messages output, so remove the "Retry ..." message, instead, track time and output to the the sucessful message. Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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*
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* Copyright (C) 2013 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#define pr_fmt(fmt) "psci: " fmt
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/smp.h>
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#include <linux/delay.h>
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#include <linux/psci.h>
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#include <linux/mm.h>
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#include <uapi/linux/psci.h>
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#include <asm/cpu_ops.h>
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#include <asm/errno.h>
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#include <asm/smp_plat.h>
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static int __init cpu_psci_cpu_init(unsigned int cpu)
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{
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return 0;
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}
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static int __init cpu_psci_cpu_prepare(unsigned int cpu)
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{
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if (!psci_ops.cpu_on) {
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pr_err("no cpu_on method, not booting CPU%d\n", cpu);
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return -ENODEV;
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}
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return 0;
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}
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static int cpu_psci_cpu_boot(unsigned int cpu)
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{
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int err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa_symbol(secondary_entry));
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if (err)
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pr_err("failed to boot CPU%d (%d)\n", cpu, err);
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return err;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static bool cpu_psci_cpu_can_disable(unsigned int cpu)
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{
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return !psci_tos_resident_on(cpu);
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}
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static int cpu_psci_cpu_disable(unsigned int cpu)
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{
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/* Fail early if we don't have CPU_OFF support */
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if (!psci_ops.cpu_off)
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return -EOPNOTSUPP;
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/* Trusted OS will deny CPU_OFF */
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if (psci_tos_resident_on(cpu))
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return -EPERM;
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return 0;
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}
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static void cpu_psci_cpu_die(unsigned int cpu)
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{
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int ret;
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/*
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* There are no known implementations of PSCI actually using the
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* power state field, pass a sensible default for now.
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*/
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u32 state = PSCI_POWER_STATE_TYPE_POWER_DOWN <<
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PSCI_0_2_POWER_STATE_TYPE_SHIFT;
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ret = psci_ops.cpu_off(state);
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pr_crit("unable to power off CPU%u (%d)\n", cpu, ret);
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}
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static int cpu_psci_cpu_kill(unsigned int cpu)
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{
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int err;
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unsigned long start, end;
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if (!psci_ops.affinity_info)
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return 0;
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/*
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* cpu_kill could race with cpu_die and we can
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* potentially end up declaring this cpu undead
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* while it is dying. So, try again a few times.
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*/
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start = jiffies;
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end = start + msecs_to_jiffies(100);
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do {
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err = psci_ops.affinity_info(cpu_logical_map(cpu), 0);
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if (err == PSCI_0_2_AFFINITY_LEVEL_OFF) {
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pr_info("CPU%d killed (polled %d ms)\n", cpu,
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jiffies_to_msecs(jiffies - start));
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return 0;
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}
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usleep_range(100, 1000);
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} while (time_before(jiffies, end));
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pr_warn("CPU%d may not have shut down cleanly (AFFINITY_INFO reports %d)\n",
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cpu, err);
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return -ETIMEDOUT;
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}
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#endif
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const struct cpu_operations cpu_psci_ops = {
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.name = "psci",
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.cpu_init = cpu_psci_cpu_init,
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.cpu_prepare = cpu_psci_cpu_prepare,
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.cpu_boot = cpu_psci_cpu_boot,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_can_disable = cpu_psci_cpu_can_disable,
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.cpu_disable = cpu_psci_cpu_disable,
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.cpu_die = cpu_psci_cpu_die,
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.cpu_kill = cpu_psci_cpu_kill,
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#endif
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};
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