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
|
#include <linux/slab.h>
#include <asm/cacheflush.h>
#include <asm/cpu_ops.h>
#include <asm/debug-monitors.h>
#include <asm/pgtable.h>
#include <asm/memory.h>
#include <asm/smp_plat.h>
#include <asm/suspend.h>
#include <asm/tlbflush.h>
extern int __cpu_suspend(unsigned long);
/*
* This is called by __cpu_suspend() to save the state, and do whatever
* flushing is required to ensure that when the CPU goes to sleep we have
* the necessary data available when the caches are not searched.
*
* @arg: Argument to pass to suspend operations
* @ptr: CPU context virtual address
* @save_ptr: address of the location where the context physical address
* must be saved
*/
int __cpu_suspend_finisher(unsigned long arg, struct cpu_suspend_ctx *ptr,
phys_addr_t *save_ptr)
{
int cpu = smp_processor_id();
*save_ptr = virt_to_phys(ptr);
cpu_do_suspend(ptr);
/*
* Only flush the context that must be retrieved with the MMU
* off. VA primitives ensure the flush is applied to all
* cache levels so context is pushed to DRAM.
*/
__flush_dcache_area(ptr, sizeof(*ptr));
__flush_dcache_area(save_ptr, sizeof(*save_ptr));
return cpu_ops[cpu]->cpu_suspend(arg);
}
/**
* cpu_suspend
*
* @arg: argument to pass to the finisher function
*/
int cpu_suspend(unsigned long arg)
{
struct mm_struct *mm = current->active_mm;
int ret, cpu = smp_processor_id();
unsigned long flags;
/*
* If cpu_ops have not been registered or suspend
* has not been initialized, cpu_suspend call fails early.
*/
if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_suspend)
return -EOPNOTSUPP;
/*
* From this point debug exceptions are disabled to prevent
* updates to mdscr register (saved and restored along with
* general purpose registers) from kernel debuggers.
*/
local_dbg_save(flags);
/*
* mm context saved on the stack, it will be restored when
* the cpu comes out of reset through the identity mapped
* page tables, so that the thread address space is properly
* set-up on function return.
*/
ret = __cpu_suspend(arg);
if (ret == 0) {
cpu_switch_mm(mm->pgd, mm);
flush_tlb_all();
}
/*
* Restore pstate flags. OS lock and mdscr have been already
* restored, so from this point onwards, debugging is fully
* renabled if it was enabled when core started shutdown.
*/
local_dbg_restore(flags);
return ret;
}
extern struct sleep_save_sp sleep_save_sp;
extern phys_addr_t sleep_idmap_phys;
static int cpu_suspend_init(void)
{
void *ctx_ptr;
/* ctx_ptr is an array of physical addresses */
ctx_ptr = kcalloc(mpidr_hash_size(), sizeof(phys_addr_t), GFP_KERNEL);
if (WARN_ON(!ctx_ptr))
return -ENOMEM;
sleep_save_sp.save_ptr_stash = ctx_ptr;
sleep_save_sp.save_ptr_stash_phys = virt_to_phys(ctx_ptr);
sleep_idmap_phys = virt_to_phys(idmap_pg_dir);
__flush_dcache_area(&sleep_save_sp, sizeof(struct sleep_save_sp));
__flush_dcache_area(&sleep_idmap_phys, sizeof(sleep_idmap_phys));
return 0;
}
early_initcall(cpu_suspend_init);
|
