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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e67198cc05
The RCU dynticks counter is going to be merged into the context tracking subsystem. Start with moving the idle extended quiescent states entrypoints to context tracking. For now those are dumb redirections to existing RCU calls. [ paulmck: Apply kernel test robot feedback. ] Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com> Cc: Uladzislau Rezki <uladzislau.rezki@sony.com> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Nicolas Saenz Julienne <nsaenz@kernel.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Xiongfeng Wang <wangxiongfeng2@huawei.com> Cc: Yu Liao <liaoyu15@huawei.com> Cc: Phil Auld <pauld@redhat.com> Cc: Paul Gortmaker<paul.gortmaker@windriver.com> Cc: Alex Belits <abelits@marvell.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Nicolas Saenz Julienne <nsaenzju@redhat.com> Tested-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>
84 lines
2 KiB
C
84 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2012 Freescale Semiconductor, Inc.
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*/
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#include <linux/context_tracking.h>
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#include <linux/cpuidle.h>
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#include <linux/module.h>
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#include <asm/cpuidle.h>
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#include <soc/imx/cpuidle.h>
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#include "common.h"
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#include "cpuidle.h"
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#include "hardware.h"
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static int num_idle_cpus = 0;
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static DEFINE_RAW_SPINLOCK(cpuidle_lock);
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static int imx6q_enter_wait(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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raw_spin_lock(&cpuidle_lock);
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if (++num_idle_cpus == num_online_cpus())
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imx6_set_lpm(WAIT_UNCLOCKED);
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raw_spin_unlock(&cpuidle_lock);
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ct_idle_enter();
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cpu_do_idle();
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ct_idle_exit();
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raw_spin_lock(&cpuidle_lock);
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if (num_idle_cpus-- == num_online_cpus())
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imx6_set_lpm(WAIT_CLOCKED);
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raw_spin_unlock(&cpuidle_lock);
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return index;
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}
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static struct cpuidle_driver imx6q_cpuidle_driver = {
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.name = "imx6q_cpuidle",
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.owner = THIS_MODULE,
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.states = {
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/* WFI */
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ARM_CPUIDLE_WFI_STATE,
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/* WAIT */
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{
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.exit_latency = 50,
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.target_residency = 75,
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.flags = CPUIDLE_FLAG_TIMER_STOP | CPUIDLE_FLAG_RCU_IDLE,
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.enter = imx6q_enter_wait,
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.name = "WAIT",
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.desc = "Clock off",
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},
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},
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.state_count = 2,
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.safe_state_index = 0,
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};
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/*
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* i.MX6 Q/DL has an erratum (ERR006687) that prevents the FEC from waking the
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* CPUs when they are in wait(unclocked) state. As the hardware workaround isn't
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* applicable to all boards, disable the deeper idle state when the workaround
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* isn't present and the FEC is in use.
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*/
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void imx6q_cpuidle_fec_irqs_used(void)
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{
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cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, true);
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}
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EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_used);
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void imx6q_cpuidle_fec_irqs_unused(void)
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{
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cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, false);
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}
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EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_unused);
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int __init imx6q_cpuidle_init(void)
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{
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/* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */
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imx6_set_int_mem_clk_lpm(true);
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return cpuidle_register(&imx6q_cpuidle_driver, NULL);
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}
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