1 /* SPDX-License-Identifier: GPL-2.0 */
5 * Derived from "include/asm-i386/mmu_context.h"
8 #ifndef __S390_MMU_CONTEXT_H
9 #define __S390_MMU_CONTEXT_H
11 #include <asm/pgalloc.h>
12 #include <linux/uaccess.h>
13 #include <linux/mm_types.h>
14 #include <asm/tlbflush.h>
15 #include <asm/ctl_reg.h>
16 #include <asm-generic/mm_hooks.h>
18 #define init_new_context init_new_context
19 static inline int init_new_context(struct task_struct *tsk,
22 unsigned long asce_type, init_entry;
24 spin_lock_init(&mm->context.lock);
25 INIT_LIST_HEAD(&mm->context.pgtable_list);
26 INIT_LIST_HEAD(&mm->context.gmap_list);
27 cpumask_clear(&mm->context.cpu_attach_mask);
28 atomic_set(&mm->context.flush_count, 0);
29 atomic_set(&mm->context.is_protected, 0);
30 mm->context.gmap_asce = 0;
31 mm->context.flush_mm = 0;
33 mm->context.alloc_pgste = page_table_allocate_pgste ||
34 test_thread_flag(TIF_PGSTE) ||
35 (current->mm && current->mm->context.alloc_pgste);
36 mm->context.has_pgste = 0;
37 mm->context.uses_skeys = 0;
38 mm->context.uses_cmm = 0;
39 mm->context.allow_gmap_hpage_1m = 0;
41 switch (mm->context.asce_limit) {
44 * context created by exec, the value of asce_limit can
45 * only be zero in this case
47 VM_BUG_ON(mm->context.asce_limit);
48 /* continue as 3-level task */
49 mm->context.asce_limit = _REGION2_SIZE;
52 /* forked 3-level task */
53 init_entry = _REGION3_ENTRY_EMPTY;
54 asce_type = _ASCE_TYPE_REGION3;
57 /* forked 5-level task */
58 init_entry = _REGION1_ENTRY_EMPTY;
59 asce_type = _ASCE_TYPE_REGION1;
62 /* forked 4-level task */
63 init_entry = _REGION2_ENTRY_EMPTY;
64 asce_type = _ASCE_TYPE_REGION2;
67 mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
68 _ASCE_USER_BITS | asce_type;
69 crst_table_init((unsigned long *) mm->pgd, init_entry);
73 static inline void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
74 struct task_struct *tsk)
76 int cpu = smp_processor_id();
79 S390_lowcore.user_asce = s390_invalid_asce;
81 S390_lowcore.user_asce = next->context.asce;
82 cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
83 /* Clear previous user-ASCE from CR7 */
84 __ctl_load(s390_invalid_asce, 7, 7);
86 cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
88 #define switch_mm_irqs_off switch_mm_irqs_off
90 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
91 struct task_struct *tsk)
95 local_irq_save(flags);
96 switch_mm_irqs_off(prev, next, tsk);
97 local_irq_restore(flags);
100 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
101 static inline void finish_arch_post_lock_switch(void)
103 struct task_struct *tsk = current;
104 struct mm_struct *mm = tsk->mm;
108 while (atomic_read(&mm->context.flush_count))
110 cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
111 __tlb_flush_mm_lazy(mm);
114 __ctl_load(S390_lowcore.user_asce, 7, 7);
117 #define activate_mm activate_mm
118 static inline void activate_mm(struct mm_struct *prev,
119 struct mm_struct *next)
121 switch_mm(prev, next, current);
122 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
123 __ctl_load(S390_lowcore.user_asce, 7, 7);
126 #include <asm-generic/mmu_context.h>
128 #endif /* __S390_MMU_CONTEXT_H */