1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
* Copyright (C) 2002 ARM Ltd.
* All Rights Reserved
* Copyright (c) 2011-2014, 2016 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/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <soc/qcom/spm.h>
#include <soc/qcom/pm.h>
#include <linux/irqchip/arm-gic.h>
#include <asm/smp_plat.h>
#include <asm/vfp.h>
#include <soc/qcom/jtag.h>
static cpumask_t cpu_dying_mask;
static DEFINE_PER_CPU(unsigned int, warm_boot_flag);
static inline void cpu_enter_lowpower(void)
{
}
static inline void cpu_leave_lowpower(void)
{
}
static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
{
/* Just enter wfi for now. TODO: Properly shut off the cpu. */
for (;;) {
lpm_cpu_hotplug_enter(cpu);
if (pen_release == cpu_logical_map(cpu)) {
/*
* OK, proper wakeup, we're done
*/
break;
}
/*
* getting here, means that we have come out of WFI without
* having been woken up - this shouldn't happen
*
* The trouble is, letting people know about this is not really
* possible, since we are currently running incoherently, and
* therefore cannot safely call printk() or anything else
* Read the pending interrupts to understand why we woke up
*/
#ifdef CONFIG_MSM_PM
gic_show_pending_irq();
#endif
(*spurious)++;
}
}
int msm_cpu_kill(unsigned int cpu)
{
int ret = 0;
if (cpumask_test_and_clear_cpu(cpu, &cpu_dying_mask))
ret = msm_pm_wait_cpu_shutdown(cpu);
return ret ? 0 : 1;
}
/*
* platform-specific code to shutdown a CPU
*
* Called with IRQs disabled
*/
void __ref msm_cpu_die(unsigned int cpu)
{
int spurious = 0;
if (unlikely(cpu != smp_processor_id())) {
pr_crit("%s: running on %u, should be %u\n",
__func__, smp_processor_id(), cpu);
BUG();
}
/*
* we're ready for shutdown now, so do it
*/
cpu_enter_lowpower();
platform_do_lowpower(cpu, &spurious);
pr_debug("CPU%u: %s: normal wakeup\n", cpu, __func__);
cpu_leave_lowpower();
if (spurious)
pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
}
static int hotplug_dying_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
switch (action & (~CPU_TASKS_FROZEN)) {
case CPU_DYING:
cpumask_set_cpu((unsigned long)hcpu, &cpu_dying_mask);
break;
default:
break;
}
return NOTIFY_OK;
}
static struct notifier_block hotplug_dying_notifier = {
.notifier_call = hotplug_dying_callback,
};
int msm_platform_secondary_init(unsigned int cpu)
{
int ret;
unsigned int *warm_boot = &__get_cpu_var(warm_boot_flag);
if (!(*warm_boot)) {
*warm_boot = 1;
/*
* All CPU0 boots are considered warm boots (restore needed)
* since CPU0 is the system boot CPU and never cold-booted
* by the kernel.
*/
if (cpu)
return 0;
}
msm_jtag_restore_state();
#if defined(CONFIG_VFP) && defined (CONFIG_CPU_PM)
vfp_pm_resume();
#endif
ret = msm_spm_set_low_power_mode(MSM_SPM_MODE_CLOCK_GATING, false);
return ret;
}
static int __init init_hotplug_dying(void)
{
return register_hotcpu_notifier(&hotplug_dying_notifier);
}
early_initcall(init_hotplug_dying);
|
