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/*
* Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/msm_rtb.h>
#define CPU_SHIFT 0
#define CPU_MASK 0xF
#define CPU_OF(n) (((n) & CPU_MASK) << CPU_SHIFT)
#define CPUSET_SHIFT 4
#define CPUSET_MASK 0xFFFF
#define CPUSET_OF(n) (((n) & CPUSET_MASK) << CPUSET_SHIFT)
static int hotplug_rtb_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
/*
* Bits [19:4] of the data are the online mask, lower 4 bits are the
* cpu number that is being changed. Additionally, changes to the
* online_mask that will be done by the current hotplug will be made
* even though they aren't necessarily in the online mask yet.
*
* XXX: This design is limited to supporting at most 16 cpus
*/
unsigned long this_cpumask = CPUSET_OF(1 << (unsigned long)hcpu);
unsigned long cpumask = CPUSET_OF(cpumask_bits(cpu_online_mask)[0]);
unsigned long cpudata = CPU_OF((unsigned long)hcpu) | cpumask;
switch (action & (~CPU_TASKS_FROZEN)) {
case CPU_STARTING:
uncached_logk(LOGK_HOTPLUG, (void *)(cpudata | this_cpumask));
break;
case CPU_DYING:
uncached_logk(LOGK_HOTPLUG, (void *)(cpudata & ~this_cpumask));
break;
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block hotplug_rtb_notifier = {
.notifier_call = hotplug_rtb_callback,
};
static int __init init_hotplug_rtb(void)
{
return register_hotcpu_notifier(&hotplug_rtb_notifier);
}
early_initcall(init_hotplug_rtb);
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