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1#include <linux/init.h>
2#include <linux/slab.h>
3
4#include <asm/cacheflush.h>
5#include <asm/idmap.h>
6#include <asm/pgalloc.h>
7#include <asm/pgtable.h>
8#include <asm/memory.h>
9#include <asm/smp_plat.h>
10#include <asm/suspend.h>
11#include <asm/tlbflush.h>
12
13extern int __cpu_suspend(unsigned long, int (*)(unsigned long), u32 cpuid);
14extern void cpu_resume_mmu(void);
15
16#ifdef CONFIG_MMU
17int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
18{
19 struct mm_struct *mm = current->active_mm;
20 u32 __mpidr = cpu_logical_map(smp_processor_id());
21 int ret;
22
23 if (!idmap_pgd)
24 return -EINVAL;
25
26 /*
27 * Provide a temporary page table with an identity mapping for
28 * the MMU-enable code, required for resuming. On successful
29 * resume (indicated by a zero return code), we need to switch
30 * back to the correct page tables.
31 */
32 ret = __cpu_suspend(arg, fn, __mpidr);
33 if (ret == 0) {
34 cpu_switch_mm(mm->pgd, mm);
35 local_flush_bp_all();
36 local_flush_tlb_all();
37 }
38
39 return ret;
40}
41#else
42int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
43{
44 u32 __mpidr = cpu_logical_map(smp_processor_id());
45 return __cpu_suspend(arg, fn, __mpidr);
46}
47#define idmap_pgd NULL
48#endif
49
50/*
51 * This is called by __cpu_suspend() to save the state, and do whatever
52 * flushing is required to ensure that when the CPU goes to sleep we have
53 * the necessary data available when the caches are not searched.
54 */
55void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
56{
57 u32 *ctx = ptr;
58
59 *save_ptr = virt_to_phys(ptr);
60
61 /* This must correspond to the LDM in cpu_resume() assembly */
62 *ptr++ = virt_to_phys(idmap_pgd);
63 *ptr++ = sp;
64 *ptr++ = virt_to_phys(cpu_do_resume);
65
66 cpu_do_suspend(ptr);
67
68 flush_cache_louis();
69
70 /*
71 * flush_cache_louis does not guarantee that
72 * save_ptr and ptr are cleaned to main memory,
73 * just up to the Level of Unification Inner Shareable.
74 * Since the context pointer and context itself
75 * are to be retrieved with the MMU off that
76 * data must be cleaned from all cache levels
77 * to main memory using "area" cache primitives.
78 */
79 __cpuc_flush_dcache_area(ctx, ptrsz);
80 __cpuc_flush_dcache_area(save_ptr, sizeof(*save_ptr));
81
82 outer_clean_range(*save_ptr, *save_ptr + ptrsz);
83 outer_clean_range(virt_to_phys(save_ptr),
84 virt_to_phys(save_ptr) + sizeof(*save_ptr));
85}
86
87extern struct sleep_save_sp sleep_save_sp;
88
89static int cpu_suspend_alloc_sp(void)
90{
91 void *ctx_ptr;
92 /* ctx_ptr is an array of physical addresses */
93 ctx_ptr = kcalloc(mpidr_hash_size(), sizeof(u32), GFP_KERNEL);
94
95 if (WARN_ON(!ctx_ptr))
96 return -ENOMEM;
97 sleep_save_sp.save_ptr_stash = ctx_ptr;
98 sleep_save_sp.save_ptr_stash_phys = virt_to_phys(ctx_ptr);
99 sync_cache_w(&sleep_save_sp);
100 return 0;
101}
102early_initcall(cpu_suspend_alloc_sp);
1#include <linux/init.h>
2#include <linux/slab.h>
3
4#include <asm/cacheflush.h>
5#include <asm/idmap.h>
6#include <asm/pgalloc.h>
7#include <asm/pgtable.h>
8#include <asm/memory.h>
9#include <asm/smp_plat.h>
10#include <asm/suspend.h>
11#include <asm/tlbflush.h>
12
13extern int __cpu_suspend(unsigned long, int (*)(unsigned long), u32 cpuid);
14extern void cpu_resume_mmu(void);
15
16#ifdef CONFIG_MMU
17int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
18{
19 struct mm_struct *mm = current->active_mm;
20 u32 __mpidr = cpu_logical_map(smp_processor_id());
21 int ret;
22
23 if (!idmap_pgd)
24 return -EINVAL;
25
26 /*
27 * Provide a temporary page table with an identity mapping for
28 * the MMU-enable code, required for resuming. On successful
29 * resume (indicated by a zero return code), we need to switch
30 * back to the correct page tables.
31 */
32 ret = __cpu_suspend(arg, fn, __mpidr);
33 if (ret == 0) {
34 cpu_switch_mm(mm->pgd, mm);
35 local_flush_bp_all();
36 local_flush_tlb_all();
37 }
38
39 return ret;
40}
41#else
42int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
43{
44 u32 __mpidr = cpu_logical_map(smp_processor_id());
45 return __cpu_suspend(arg, fn, __mpidr);
46}
47#define idmap_pgd NULL
48#endif
49
50/*
51 * This is called by __cpu_suspend() to save the state, and do whatever
52 * flushing is required to ensure that when the CPU goes to sleep we have
53 * the necessary data available when the caches are not searched.
54 */
55void __cpu_suspend_save(u32 *ptr, u32 ptrsz, u32 sp, u32 *save_ptr)
56{
57 u32 *ctx = ptr;
58
59 *save_ptr = virt_to_phys(ptr);
60
61 /* This must correspond to the LDM in cpu_resume() assembly */
62 *ptr++ = virt_to_phys(idmap_pgd);
63 *ptr++ = sp;
64 *ptr++ = virt_to_phys(cpu_do_resume);
65
66 cpu_do_suspend(ptr);
67
68 flush_cache_louis();
69
70 /*
71 * flush_cache_louis does not guarantee that
72 * save_ptr and ptr are cleaned to main memory,
73 * just up to the Level of Unification Inner Shareable.
74 * Since the context pointer and context itself
75 * are to be retrieved with the MMU off that
76 * data must be cleaned from all cache levels
77 * to main memory using "area" cache primitives.
78 */
79 __cpuc_flush_dcache_area(ctx, ptrsz);
80 __cpuc_flush_dcache_area(save_ptr, sizeof(*save_ptr));
81
82 outer_clean_range(*save_ptr, *save_ptr + ptrsz);
83 outer_clean_range(virt_to_phys(save_ptr),
84 virt_to_phys(save_ptr) + sizeof(*save_ptr));
85}
86
87extern struct sleep_save_sp sleep_save_sp;
88
89static int cpu_suspend_alloc_sp(void)
90{
91 void *ctx_ptr;
92 /* ctx_ptr is an array of physical addresses */
93 ctx_ptr = kcalloc(mpidr_hash_size(), sizeof(u32), GFP_KERNEL);
94
95 if (WARN_ON(!ctx_ptr))
96 return -ENOMEM;
97 sleep_save_sp.save_ptr_stash = ctx_ptr;
98 sleep_save_sp.save_ptr_stash_phys = virt_to_phys(ctx_ptr);
99 sync_cache_w(&sleep_save_sp);
100 return 0;
101}
102early_initcall(cpu_suspend_alloc_sp);