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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * S390 version |
4 | * | |
5 | * Derived from "include/asm-i386/mmu_context.h" | |
6 | */ | |
7 | ||
8 | #ifndef __S390_MMU_CONTEXT_H | |
9 | #define __S390_MMU_CONTEXT_H | |
10 | ||
c1821c2e | 11 | #include <asm/pgalloc.h> |
7c0f6ba6 | 12 | #include <linux/uaccess.h> |
589ee628 | 13 | #include <linux/mm_types.h> |
050eef36 | 14 | #include <asm/tlbflush.h> |
a0616cde | 15 | #include <asm/ctl_reg.h> |
8e58ab5c | 16 | #include <asm-generic/mm_hooks.h> |
d6dd61c8 | 17 | |
6f457e1a MS |
18 | static inline int init_new_context(struct task_struct *tsk, |
19 | struct mm_struct *mm) | |
20 | { | |
60f07c8e | 21 | spin_lock_init(&mm->context.lock); |
3446c13b MS |
22 | INIT_LIST_HEAD(&mm->context.pgtable_list); |
23 | INIT_LIST_HEAD(&mm->context.gmap_list); | |
1b948d6c | 24 | cpumask_clear(&mm->context.cpu_attach_mask); |
64f31d58 | 25 | atomic_set(&mm->context.flush_count, 0); |
44b6cc81 | 26 | mm->context.gmap_asce = 0; |
050eef36 | 27 | mm->context.flush_mm = 0; |
0b46e0a3 | 28 | #ifdef CONFIG_PGSTE |
23fefe11 MS |
29 | mm->context.alloc_pgste = page_table_allocate_pgste || |
30 | test_thread_flag(TIF_PGSTE) || | |
31 | current->mm->context.alloc_pgste; | |
3eabaee9 | 32 | mm->context.has_pgste = 0; |
693ffc08 | 33 | mm->context.use_skey = 0; |
aa824e13 | 34 | mm->context.use_cmma = 0; |
0b46e0a3 | 35 | #endif |
723cacbd | 36 | switch (mm->context.asce_limit) { |
f1c1174f | 37 | case _REGION2_SIZE: |
723cacbd GS |
38 | /* |
39 | * forked 3-level task, fall through to set new asce with new | |
40 | * mm->pgd | |
41 | */ | |
42 | case 0: | |
3446c13b | 43 | /* context created by exec, set asce limit to 4TB */ |
3446c13b | 44 | mm->context.asce_limit = STACK_TOP_MAX; |
723cacbd GS |
45 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | |
46 | _ASCE_USER_BITS | _ASCE_TYPE_REGION3; | |
47 | break; | |
0b89ede6 MS |
48 | case -PAGE_SIZE: |
49 | /* forked 5-level task, set new asce with new_mm->pgd */ | |
50 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | | |
51 | _ASCE_USER_BITS | _ASCE_TYPE_REGION1; | |
52 | break; | |
f1c1174f | 53 | case _REGION1_SIZE: |
723cacbd GS |
54 | /* forked 4-level task, set new asce with new mm->pgd */ |
55 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | | |
56 | _ASCE_USER_BITS | _ASCE_TYPE_REGION2; | |
57 | break; | |
f1c1174f | 58 | case _REGION3_SIZE: |
723cacbd GS |
59 | /* forked 2-level compat task, set new asce with new mm->pgd */ |
60 | mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH | | |
61 | _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT; | |
62 | /* pgd_alloc() did not increase mm->nr_pmds */ | |
3446c13b MS |
63 | mm_inc_nr_pmds(mm); |
64 | } | |
6252d702 | 65 | crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); |
6f457e1a MS |
66 | return 0; |
67 | } | |
1da177e4 LT |
68 | |
69 | #define destroy_context(mm) do { } while (0) | |
70 | ||
beef560b | 71 | static inline void set_user_asce(struct mm_struct *mm) |
1da177e4 | 72 | { |
723cacbd | 73 | S390_lowcore.user_asce = mm->context.asce; |
f8b13505 MS |
74 | if (current->thread.mm_segment.ar4) |
75 | __ctl_load(S390_lowcore.user_asce, 7, 7); | |
606aa4aa | 76 | set_cpu_flag(CIF_ASCE_PRIMARY); |
1da177e4 LT |
77 | } |
78 | ||
beef560b | 79 | static inline void clear_user_asce(void) |
02a8f3ab MS |
80 | { |
81 | S390_lowcore.user_asce = S390_lowcore.kernel_asce; | |
457f2180 | 82 | |
beef560b | 83 | __ctl_load(S390_lowcore.user_asce, 1, 1); |
457f2180 HC |
84 | __ctl_load(S390_lowcore.user_asce, 7, 7); |
85 | } | |
86 | ||
beef560b | 87 | static inline void load_kernel_asce(void) |
457f2180 HC |
88 | { |
89 | unsigned long asce; | |
90 | ||
91 | __ctl_store(asce, 1, 1); | |
92 | if (asce != S390_lowcore.kernel_asce) | |
93 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); | |
606aa4aa | 94 | set_cpu_flag(CIF_ASCE_PRIMARY); |
02a8f3ab MS |
95 | } |
96 | ||
1da177e4 | 97 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
c1821c2e | 98 | struct task_struct *tsk) |
1da177e4 | 99 | { |
53e857f3 MS |
100 | int cpu = smp_processor_id(); |
101 | ||
723cacbd | 102 | S390_lowcore.user_asce = next->context.asce; |
53e857f3 MS |
103 | if (prev == next) |
104 | return; | |
64f31d58 | 105 | cpumask_set_cpu(cpu, &next->context.cpu_attach_mask); |
beef560b MS |
106 | /* Clear old ASCE by loading the kernel ASCE. */ |
107 | __ctl_load(S390_lowcore.kernel_asce, 1, 1); | |
108 | __ctl_load(S390_lowcore.kernel_asce, 7, 7); | |
64f31d58 | 109 | cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); |
53e857f3 MS |
110 | } |
111 | ||
112 | #define finish_arch_post_lock_switch finish_arch_post_lock_switch | |
113 | static inline void finish_arch_post_lock_switch(void) | |
114 | { | |
115 | struct task_struct *tsk = current; | |
116 | struct mm_struct *mm = tsk->mm; | |
117 | ||
f8b13505 MS |
118 | load_kernel_asce(); |
119 | if (mm) { | |
120 | preempt_disable(); | |
64f31d58 | 121 | while (atomic_read(&mm->context.flush_count)) |
f8b13505 | 122 | cpu_relax(); |
b3e5dc45 | 123 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); |
60f07c8e | 124 | __tlb_flush_mm_lazy(mm); |
f8b13505 MS |
125 | preempt_enable(); |
126 | } | |
127 | set_fs(current->thread.mm_segment); | |
1da177e4 LT |
128 | } |
129 | ||
3610cce8 | 130 | #define enter_lazy_tlb(mm,tsk) do { } while (0) |
1da177e4 LT |
131 | #define deactivate_mm(tsk,mm) do { } while (0) |
132 | ||
4448aaf0 | 133 | static inline void activate_mm(struct mm_struct *prev, |
1da177e4 LT |
134 | struct mm_struct *next) |
135 | { | |
beef560b | 136 | switch_mm(prev, next, current); |
b3e5dc45 | 137 | cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); |
beef560b | 138 | set_user_asce(next); |
1da177e4 LT |
139 | } |
140 | ||
c1821c2e | 141 | #endif /* __S390_MMU_CONTEXT_H */ |