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 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);
44 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
45 extern void set_context(unsigned long id, pgd_t *pgd);
47 #ifdef CONFIG_PPC_BOOK3S_64
48 extern void radix__switch_mmu_context(struct mm_struct *prev,
49 struct mm_struct *next);
50 static inline void switch_mmu_context(struct mm_struct *prev,
51 struct mm_struct *next,
52 struct task_struct *tsk)
55 return radix__switch_mmu_context(prev, next);
56 return switch_slb(tsk, next);
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);
62 static inline void mmu_context_init(void) { }
64 static inline int alloc_extended_context(struct mm_struct *mm,
69 int index = ea >> MAX_EA_BITS_PER_CONTEXT;
71 context_id = hash__alloc_context_id();
75 VM_WARN_ON(mm->context.extended_id[index]);
76 mm->context.extended_id[index] = context_id;
80 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
84 context_id = get_ea_context(&mm->context, ea);
91 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
92 struct task_struct *tsk);
93 extern unsigned long __init_new_context(void);
94 extern void __destroy_context(unsigned long context_id);
95 extern void mmu_context_init(void);
96 static inline int alloc_extended_context(struct mm_struct *mm,
99 /* non book3s_64 should never find this called */
104 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
110 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
111 extern void radix_kvm_prefetch_workaround(struct mm_struct *mm);
113 static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { }
116 extern void switch_cop(struct mm_struct *next);
117 extern int use_cop(unsigned long acop, struct mm_struct *mm);
118 extern void drop_cop(unsigned long acop, struct mm_struct *mm);
120 #ifdef CONFIG_PPC_BOOK3S_64
121 static inline void inc_mm_active_cpus(struct mm_struct *mm)
123 atomic_inc(&mm->context.active_cpus);
126 static inline void dec_mm_active_cpus(struct mm_struct *mm)
128 atomic_dec(&mm->context.active_cpus);
131 static inline void mm_context_add_copro(struct mm_struct *mm)
134 * If any copro is in use, increment the active CPU count
135 * in order to force TLB invalidations to be global as to
136 * propagate to the Nest MMU.
138 if (atomic_inc_return(&mm->context.copros) == 1)
139 inc_mm_active_cpus(mm);
142 static inline void mm_context_remove_copro(struct mm_struct *mm)
147 * When removing the last copro, we need to broadcast a global
148 * flush of the full mm, as the next TLBI may be local and the
149 * nMMU and/or PSL need to be cleaned up.
151 * Both the 'copros' and 'active_cpus' counts are looked at in
152 * flush_all_mm() to determine the scope (local/global) of the
153 * TLBIs, so we need to flush first before decrementing
154 * 'copros'. If this API is used by several callers for the
155 * same context, it can lead to over-flushing. It's hopefully
156 * not common enough to be a problem.
158 * Skip on hash, as we don't know how to do the proper flush
159 * for the time being. Invalidations will remain global if
160 * used on hash. Note that we can't drop 'copros' either, as
161 * it could make some invalidations local with no flush
164 if (radix_enabled()) {
167 c = atomic_dec_if_positive(&mm->context.copros);
168 /* Detect imbalance between add and remove */
172 dec_mm_active_cpus(mm);
176 static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
177 static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
178 static inline void mm_context_add_copro(struct mm_struct *mm) { }
179 static inline void mm_context_remove_copro(struct mm_struct *mm) { }
183 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
184 struct task_struct *tsk);
186 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
187 struct task_struct *tsk)
191 local_irq_save(flags);
192 switch_mm_irqs_off(prev, next, tsk);
193 local_irq_restore(flags);
195 #define switch_mm_irqs_off switch_mm_irqs_off
198 #define deactivate_mm(tsk,mm) do { } while (0)
201 * After we have set current->mm to a new value, this activates
202 * the context for the new mm so we see the new mappings.
204 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
206 switch_mm(prev, next, current);
209 /* We don't currently use enter_lazy_tlb() for anything */
210 static inline void enter_lazy_tlb(struct mm_struct *mm,
211 struct task_struct *tsk)
213 /* 64-bit Book3E keeps track of current PGD in the PACA */
214 #ifdef CONFIG_PPC_BOOK3E_64
215 get_paca()->pgd = NULL;
219 static inline int arch_dup_mmap(struct mm_struct *oldmm,
220 struct mm_struct *mm)
225 #ifndef CONFIG_PPC_BOOK3S_64
226 static inline void arch_exit_mmap(struct mm_struct *mm)
230 extern void arch_exit_mmap(struct mm_struct *mm);
233 static inline void arch_unmap(struct mm_struct *mm,
234 struct vm_area_struct *vma,
235 unsigned long start, unsigned long end)
237 if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
238 mm->context.vdso_base = 0;
241 static inline void arch_bprm_mm_init(struct mm_struct *mm,
242 struct vm_area_struct *vma)
246 #ifdef CONFIG_PPC_MEM_KEYS
247 bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
248 bool execute, bool foreign);
249 #else /* CONFIG_PPC_MEM_KEYS */
250 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
251 bool write, bool execute, bool foreign)
253 /* by default, allow everything */
257 #define pkey_mm_init(mm)
258 #define thread_pkey_regs_save(thread)
259 #define thread_pkey_regs_restore(new_thread, old_thread)
260 #define thread_pkey_regs_init(thread)
262 static inline u64 pte_to_hpte_pkey_bits(u64 pteflags)
267 #endif /* CONFIG_PPC_MEM_KEYS */
269 #endif /* __KERNEL__ */
270 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */