suspend.c (4b4193256c8d3bc3a5397b5cd9494c2ad386317d) suspend.c (8252ca87c7a2111502ee13994956f8c309faad7f)
1// SPDX-License-Identifier: GPL-2.0
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ftrace.h>
2#include <linux/init.h>
3#include <linux/slab.h>
4#include <linux/mm_types.h>
5#include <linux/pgtable.h>
6
7#include <asm/bugs.h>
8#include <asm/cacheflush.h>
9#include <asm/idmap.h>

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21 struct mm_struct *mm = current->active_mm;
22 u32 __mpidr = cpu_logical_map(smp_processor_id());
23 int ret;
24
25 if (!idmap_pgd)
26 return -EINVAL;
27
28 /*
3#include <linux/init.h>
4#include <linux/slab.h>
5#include <linux/mm_types.h>
6#include <linux/pgtable.h>
7
8#include <asm/bugs.h>
9#include <asm/cacheflush.h>
10#include <asm/idmap.h>

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22 struct mm_struct *mm = current->active_mm;
23 u32 __mpidr = cpu_logical_map(smp_processor_id());
24 int ret;
25
26 if (!idmap_pgd)
27 return -EINVAL;
28
29 /*
30 * Function graph tracer state gets incosistent when the kernel
31 * calls functions that never return (aka suspend finishers) hence
32 * disable graph tracing during their execution.
33 */
34 pause_graph_tracing();
35
36 /*
29 * Provide a temporary page table with an identity mapping for
30 * the MMU-enable code, required for resuming. On successful
31 * resume (indicated by a zero return code), we need to switch
32 * back to the correct page tables.
33 */
34 ret = __cpu_suspend(arg, fn, __mpidr);
37 * Provide a temporary page table with an identity mapping for
38 * the MMU-enable code, required for resuming. On successful
39 * resume (indicated by a zero return code), we need to switch
40 * back to the correct page tables.
41 */
42 ret = __cpu_suspend(arg, fn, __mpidr);
43
44 unpause_graph_tracing();
45
35 if (ret == 0) {
36 cpu_switch_mm(mm->pgd, mm);
37 local_flush_bp_all();
38 local_flush_tlb_all();
39 check_other_bugs();
40 }
41
42 return ret;
43}
44#else
45int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
46{
47 u32 __mpidr = cpu_logical_map(smp_processor_id());
46 if (ret == 0) {
47 cpu_switch_mm(mm->pgd, mm);
48 local_flush_bp_all();
49 local_flush_tlb_all();
50 check_other_bugs();
51 }
52
53 return ret;
54}
55#else
56int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
57{
58 u32 __mpidr = cpu_logical_map(smp_processor_id());
48 return __cpu_suspend(arg, fn, __mpidr);
59 int ret;
60
61 pause_graph_tracing();
62 ret = __cpu_suspend(arg, fn, __mpidr);
63 unpause_graph_tracing();
64
65 return ret;
49}
50#define idmap_pgd NULL
51#endif
52
53/*
54 * This is called by __cpu_suspend() to save the state, and do whatever
55 * flushing is required to ensure that when the CPU goes to sleep we have
56 * the necessary data available when the caches are not searched.

--- 49 unchanged lines hidden --- 		66}
67#define idmap_pgd NULL
68#endif
69
70/*
71 * This is called by __cpu_suspend() to save the state, and do whatever
72 * flushing is required to ensure that when the CPU goes to sleep we have
73 * the necessary data available when the caches are not searched.

--- 49 unchanged lines hidden ---