1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_POWERPC_MMU_CONTEXT_H
3 #define __ASM_POWERPC_MMU_CONTEXT_H
6 #include <linux/kernel.h>
8 #include <linux/sched.h>
9 #include <linux/spinlock.h>
11 #include <asm/cputable.h>
12 #include <asm/cputhreads.h>
15 * Most if the context management is out of line
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;
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 void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua);
42 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
43 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
45 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
46 extern void set_context(unsigned long id, pgd_t *pgd);
48 #ifdef CONFIG_PPC_BOOK3S_64
49 extern void radix__switch_mmu_context(struct mm_struct *prev,
50 struct mm_struct *next);
51 static inline void switch_mmu_context(struct mm_struct *prev,
52 struct mm_struct *next,
53 struct task_struct *tsk)
56 return radix__switch_mmu_context(prev, next);
57 return switch_slb(tsk, next);
60 extern int hash__alloc_context_id(void);
61 extern void hash__reserve_context_id(int id);
62 extern void __destroy_context(int context_id);
63 static inline void mmu_context_init(void) { }
65 static inline int alloc_extended_context(struct mm_struct *mm,
70 int index = ea >> MAX_EA_BITS_PER_CONTEXT;
72 context_id = hash__alloc_context_id();
76 VM_WARN_ON(mm->context.extended_id[index]);
77 mm->context.extended_id[index] = context_id;
81 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
85 context_id = get_ea_context(&mm->context, ea);
92 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
93 struct task_struct *tsk);
94 extern unsigned long __init_new_context(void);
95 extern void __destroy_context(unsigned long context_id);
96 extern void mmu_context_init(void);
97 static inline int alloc_extended_context(struct mm_struct *mm,
100 /* non book3s_64 should never find this called */
105 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
111 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
112 extern void radix_kvm_prefetch_workaround(struct mm_struct *mm);
114 static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { }
117 extern void switch_cop(struct mm_struct *next);
118 extern int use_cop(unsigned long acop, struct mm_struct *mm);
119 extern void drop_cop(unsigned long acop, struct mm_struct *mm);
121 #ifdef CONFIG_PPC_BOOK3S_64
122 static inline void inc_mm_active_cpus(struct mm_struct *mm)
124 atomic_inc(&mm->context.active_cpus);
127 static inline void dec_mm_active_cpus(struct mm_struct *mm)
129 atomic_dec(&mm->context.active_cpus);
132 static inline void mm_context_add_copro(struct mm_struct *mm)
135 * If any copro is in use, increment the active CPU count
136 * in order to force TLB invalidations to be global as to
137 * propagate to the Nest MMU.
139 if (atomic_inc_return(&mm->context.copros) == 1)
140 inc_mm_active_cpus(mm);
143 static inline void mm_context_remove_copro(struct mm_struct *mm)
148 * When removing the last copro, we need to broadcast a global
149 * flush of the full mm, as the next TLBI may be local and the
150 * nMMU and/or PSL need to be cleaned up.
152 * Both the 'copros' and 'active_cpus' counts are looked at in
153 * flush_all_mm() to determine the scope (local/global) of the
154 * TLBIs, so we need to flush first before decrementing
155 * 'copros'. If this API is used by several callers for the
156 * same context, it can lead to over-flushing. It's hopefully
157 * not common enough to be a problem.
159 * Skip on hash, as we don't know how to do the proper flush
160 * for the time being. Invalidations will remain global if
161 * used on hash. Note that we can't drop 'copros' either, as
162 * it could make some invalidations local with no flush
165 if (radix_enabled()) {
168 c = atomic_dec_if_positive(&mm->context.copros);
169 /* Detect imbalance between add and remove */
173 dec_mm_active_cpus(mm);
177 static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
178 static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
179 static inline void mm_context_add_copro(struct mm_struct *mm) { }
180 static inline void mm_context_remove_copro(struct mm_struct *mm) { }
184 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
185 struct task_struct *tsk);
187 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
188 struct task_struct *tsk)
192 local_irq_save(flags);
193 switch_mm_irqs_off(prev, next, tsk);
194 local_irq_restore(flags);
196 #define switch_mm_irqs_off switch_mm_irqs_off
199 #define deactivate_mm(tsk,mm) do { } while (0)
202 * After we have set current->mm to a new value, this activates
203 * the context for the new mm so we see the new mappings.
205 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
207 switch_mm_irqs_off(prev, next, current);
210 /* We don't currently use enter_lazy_tlb() for anything */
211 static inline void enter_lazy_tlb(struct mm_struct *mm,
212 struct task_struct *tsk)
214 /* 64-bit Book3E keeps track of current PGD in the PACA */
215 #ifdef CONFIG_PPC_BOOK3E_64
216 get_paca()->pgd = NULL;
220 #ifndef CONFIG_PPC_BOOK3S_64
221 static inline void arch_exit_mmap(struct mm_struct *mm)
225 extern void arch_exit_mmap(struct mm_struct *mm);
228 static inline void arch_unmap(struct mm_struct *mm,
229 struct vm_area_struct *vma,
230 unsigned long start, unsigned long end)
232 if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
233 mm->context.vdso_base = 0;
236 static inline void arch_bprm_mm_init(struct mm_struct *mm,
237 struct vm_area_struct *vma)
241 #ifdef CONFIG_PPC_MEM_KEYS
242 bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
243 bool execute, bool foreign);
244 void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm);
245 #else /* CONFIG_PPC_MEM_KEYS */
246 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
247 bool write, bool execute, bool foreign)
249 /* by default, allow everything */
253 #define pkey_mm_init(mm)
254 #define thread_pkey_regs_save(thread)
255 #define thread_pkey_regs_restore(new_thread, old_thread)
256 #define thread_pkey_regs_init(thread)
257 #define arch_dup_pkeys(oldmm, mm)
259 static inline u64 pte_to_hpte_pkey_bits(u64 pteflags)
264 #endif /* CONFIG_PPC_MEM_KEYS */
266 static inline int arch_dup_mmap(struct mm_struct *oldmm,
267 struct mm_struct *mm)
269 arch_dup_pkeys(oldmm, mm);
273 #endif /* __KERNEL__ */
274 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */