1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_POWERPC_MMU_CONTEXT_H
3 #define __ASM_POWERPC_MMU_CONTEXT_H
4 #ifdef __KERNEL__
5
6 #include <linux/kernel.h>
7 #include <linux/mm.h>
8 #include <linux/sched.h>
9 #include <linux/spinlock.h>
10 #include <asm/mmu.h>
11 #include <asm/cputable.h>
12 #include <asm/cputhreads.h>
13
14 /*
15 * Most if the context management is out of line
16 */
17 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
18 extern void destroy_context(struct mm_struct *mm);
19 #ifdef CONFIG_SPAPR_TCE_IOMMU
20 struct mm_iommu_table_group_mem_t;
21
22 extern int isolate_lru_page(struct page *page); /* from internal.h */
23 extern bool mm_iommu_preregistered(struct mm_struct *mm);
24 extern long mm_iommu_get(struct mm_struct *mm,
25 unsigned long ua, unsigned long entries,
26 struct mm_iommu_table_group_mem_t **pmem);
27 extern long mm_iommu_put(struct mm_struct *mm,
28 struct mm_iommu_table_group_mem_t *mem);
29 extern void mm_iommu_init(struct mm_struct *mm);
30 extern void mm_iommu_cleanup(struct mm_struct *mm);
31 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
32 unsigned long ua, unsigned long size);
33 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm(
34 struct mm_struct *mm, unsigned long ua, unsigned long size);
35 extern struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm,
36 unsigned long ua, unsigned long entries);
37 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
38 unsigned long ua, unsigned int pageshift, unsigned long *hpa);
39 extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,
40 unsigned long ua, unsigned int pageshift, unsigned long *hpa);
41 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
42 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
43 #endif
44 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
45 extern void set_context(unsigned long id, pgd_t *pgd);
46
47 #ifdef CONFIG_PPC_BOOK3S_64
48 extern void radix__switch_mmu_context(struct mm_struct *prev,
49 struct mm_struct *next);
switch_mmu_context(struct mm_struct * prev,struct mm_struct * next,struct task_struct * tsk)50 static inline void switch_mmu_context(struct mm_struct *prev,
51 struct mm_struct *next,
52 struct task_struct *tsk)
53 {
54 if (radix_enabled())
55 return radix__switch_mmu_context(prev, next);
56 return switch_slb(tsk, next);
57 }
58
59 extern int hash__alloc_context_id(void);
60 extern void hash__reserve_context_id(int id);
61 extern void __destroy_context(int context_id);
mmu_context_init(void)62 static inline void mmu_context_init(void) { }
63 #else
64 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
65 struct task_struct *tsk);
66 extern unsigned long __init_new_context(void);
67 extern void __destroy_context(unsigned long context_id);
68 extern void mmu_context_init(void);
69 #endif
70
71 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
72 extern void radix_kvm_prefetch_workaround(struct mm_struct *mm);
73 #else
radix_kvm_prefetch_workaround(struct mm_struct * mm)74 static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { }
75 #endif
76
77 extern void switch_cop(struct mm_struct *next);
78 extern int use_cop(unsigned long acop, struct mm_struct *mm);
79 extern void drop_cop(unsigned long acop, struct mm_struct *mm);
80
81 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
82 struct task_struct *tsk);
83
switch_mm(struct mm_struct * prev,struct mm_struct * next,struct task_struct * tsk)84 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
85 struct task_struct *tsk)
86 {
87 unsigned long flags;
88
89 local_irq_save(flags);
90 switch_mm_irqs_off(prev, next, tsk);
91 local_irq_restore(flags);
92 }
93 #define switch_mm_irqs_off switch_mm_irqs_off
94
95
96 #define deactivate_mm(tsk,mm) do { } while (0)
97
98 /*
99 * After we have set current->mm to a new value, this activates
100 * the context for the new mm so we see the new mappings.
101 */
activate_mm(struct mm_struct * prev,struct mm_struct * next)102 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
103 {
104 switch_mm(prev, next, current);
105 }
106
107 /* We don't currently use enter_lazy_tlb() for anything */
enter_lazy_tlb(struct mm_struct * mm,struct task_struct * tsk)108 static inline void enter_lazy_tlb(struct mm_struct *mm,
109 struct task_struct *tsk)
110 {
111 /* 64-bit Book3E keeps track of current PGD in the PACA */
112 #ifdef CONFIG_PPC_BOOK3E_64
113 get_paca()->pgd = NULL;
114 #endif
115 }
116
arch_dup_mmap(struct mm_struct * oldmm,struct mm_struct * mm)117 static inline int arch_dup_mmap(struct mm_struct *oldmm,
118 struct mm_struct *mm)
119 {
120 return 0;
121 }
122
arch_exit_mmap(struct mm_struct * mm)123 static inline void arch_exit_mmap(struct mm_struct *mm)
124 {
125 }
126
arch_unmap(struct mm_struct * mm,struct vm_area_struct * vma,unsigned long start,unsigned long end)127 static inline void arch_unmap(struct mm_struct *mm,
128 struct vm_area_struct *vma,
129 unsigned long start, unsigned long end)
130 {
131 if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
132 mm->context.vdso_base = 0;
133 }
134
arch_bprm_mm_init(struct mm_struct * mm,struct vm_area_struct * vma)135 static inline void arch_bprm_mm_init(struct mm_struct *mm,
136 struct vm_area_struct *vma)
137 {
138 }
139
arch_vma_access_permitted(struct vm_area_struct * vma,bool write,bool execute,bool foreign)140 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
141 bool write, bool execute, bool foreign)
142 {
143 /* by default, allow everything */
144 return true;
145 }
146 #endif /* __KERNEL__ */
147 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */
148