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_new(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_newdev(struct mm_struct *mm, unsigned long ua,
28 unsigned long entries, unsigned long dev_hpa,
29 struct mm_iommu_table_group_mem_t **pmem);
30 extern long mm_iommu_put(struct mm_struct *mm,
31 struct mm_iommu_table_group_mem_t *mem);
32 extern void mm_iommu_init(struct mm_struct *mm);
33 extern void mm_iommu_cleanup(struct mm_struct *mm);
34 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
35 unsigned long ua, unsigned long size);
36 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm(
37 struct mm_struct *mm, unsigned long ua, unsigned long size);
38 extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm,
39 unsigned long ua, unsigned long entries);
40 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
41 unsigned long ua, unsigned int pageshift, unsigned long *hpa);
42 extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,
43 unsigned long ua, unsigned int pageshift, unsigned long *hpa);
44 extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua);
45 extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
46 unsigned int pageshift, unsigned long *size);
47 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
48 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
50 static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
51 unsigned int pageshift, unsigned long *size)
55 static inline void mm_iommu_init(struct mm_struct *mm) { }
57 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
58 extern void set_context(unsigned long id, pgd_t *pgd);
60 #ifdef CONFIG_PPC_BOOK3S_64
61 extern void radix__switch_mmu_context(struct mm_struct *prev,
62 struct mm_struct *next);
63 static inline void switch_mmu_context(struct mm_struct *prev,
64 struct mm_struct *next,
65 struct task_struct *tsk)
68 return radix__switch_mmu_context(prev, next);
69 return switch_slb(tsk, next);
72 extern int hash__alloc_context_id(void);
73 extern void hash__reserve_context_id(int id);
74 extern void __destroy_context(int context_id);
75 static inline void mmu_context_init(void) { }
77 static inline int alloc_extended_context(struct mm_struct *mm,
82 int index = ea >> MAX_EA_BITS_PER_CONTEXT;
84 context_id = hash__alloc_context_id();
88 VM_WARN_ON(mm->context.extended_id[index]);
89 mm->context.extended_id[index] = context_id;
93 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
97 context_id = get_user_context(&mm->context, ea);
104 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
105 struct task_struct *tsk);
106 extern unsigned long __init_new_context(void);
107 extern void __destroy_context(unsigned long context_id);
108 extern void mmu_context_init(void);
109 static inline int alloc_extended_context(struct mm_struct *mm,
112 /* non book3s_64 should never find this called */
117 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
123 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
124 extern void radix_kvm_prefetch_workaround(struct mm_struct *mm);
126 static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { }
129 extern void switch_cop(struct mm_struct *next);
130 extern int use_cop(unsigned long acop, struct mm_struct *mm);
131 extern void drop_cop(unsigned long acop, struct mm_struct *mm);
133 #ifdef CONFIG_PPC_BOOK3S_64
134 static inline void inc_mm_active_cpus(struct mm_struct *mm)
136 atomic_inc(&mm->context.active_cpus);
139 static inline void dec_mm_active_cpus(struct mm_struct *mm)
141 atomic_dec(&mm->context.active_cpus);
144 static inline void mm_context_add_copro(struct mm_struct *mm)
147 * If any copro is in use, increment the active CPU count
148 * in order to force TLB invalidations to be global as to
149 * propagate to the Nest MMU.
151 if (atomic_inc_return(&mm->context.copros) == 1)
152 inc_mm_active_cpus(mm);
155 static inline void mm_context_remove_copro(struct mm_struct *mm)
160 * When removing the last copro, we need to broadcast a global
161 * flush of the full mm, as the next TLBI may be local and the
162 * nMMU and/or PSL need to be cleaned up.
164 * Both the 'copros' and 'active_cpus' counts are looked at in
165 * flush_all_mm() to determine the scope (local/global) of the
166 * TLBIs, so we need to flush first before decrementing
167 * 'copros'. If this API is used by several callers for the
168 * same context, it can lead to over-flushing. It's hopefully
169 * not common enough to be a problem.
171 * Skip on hash, as we don't know how to do the proper flush
172 * for the time being. Invalidations will remain global if
173 * used on hash. Note that we can't drop 'copros' either, as
174 * it could make some invalidations local with no flush
177 if (radix_enabled()) {
180 c = atomic_dec_if_positive(&mm->context.copros);
181 /* Detect imbalance between add and remove */
185 dec_mm_active_cpus(mm);
190 * vas_windows counter shows number of open windows in the mm
191 * context. During context switch, use this counter to clear the
192 * foreign real address mapping (CP_ABORT) for the thread / process
193 * that intend to use COPY/PASTE. When a process closes all windows,
194 * disable CP_ABORT which is expensive to run.
196 * For user context, register a copro so that TLBIs are seen by the
197 * nest MMU. mm_context_add/remove_vas_window() are used only for user
200 static inline void mm_context_add_vas_window(struct mm_struct *mm)
202 atomic_inc(&mm->context.vas_windows);
203 mm_context_add_copro(mm);
206 static inline void mm_context_remove_vas_window(struct mm_struct *mm)
210 mm_context_remove_copro(mm);
211 v = atomic_dec_if_positive(&mm->context.vas_windows);
213 /* Detect imbalance between add and remove */
217 static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
218 static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
219 static inline void mm_context_add_copro(struct mm_struct *mm) { }
220 static inline void mm_context_remove_copro(struct mm_struct *mm) { }
221 static inline void mm_context_add_vas_windows(struct mm_struct *mm) { }
222 static inline void mm_context_remove_vas_windows(struct mm_struct *mm) { }
226 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
227 struct task_struct *tsk);
229 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
230 struct task_struct *tsk)
234 local_irq_save(flags);
235 switch_mm_irqs_off(prev, next, tsk);
236 local_irq_restore(flags);
238 #define switch_mm_irqs_off switch_mm_irqs_off
241 #define deactivate_mm(tsk,mm) do { } while (0)
244 * After we have set current->mm to a new value, this activates
245 * the context for the new mm so we see the new mappings.
247 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
249 switch_mm(prev, next, current);
252 /* We don't currently use enter_lazy_tlb() for anything */
253 static inline void enter_lazy_tlb(struct mm_struct *mm,
254 struct task_struct *tsk)
256 /* 64-bit Book3E keeps track of current PGD in the PACA */
257 #ifdef CONFIG_PPC_BOOK3E_64
258 get_paca()->pgd = NULL;
262 extern void arch_exit_mmap(struct mm_struct *mm);
264 static inline void arch_unmap(struct mm_struct *mm,
265 unsigned long start, unsigned long end)
267 if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
268 mm->context.vdso_base = 0;
271 #ifdef CONFIG_PPC_MEM_KEYS
272 bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
273 bool execute, bool foreign);
274 void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm);
275 #else /* CONFIG_PPC_MEM_KEYS */
276 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
277 bool write, bool execute, bool foreign)
279 /* by default, allow everything */
283 #define pkey_mm_init(mm)
284 #define thread_pkey_regs_save(thread)
285 #define thread_pkey_regs_restore(new_thread, old_thread)
286 #define thread_pkey_regs_init(thread)
287 #define arch_dup_pkeys(oldmm, mm)
289 static inline u64 pte_to_hpte_pkey_bits(u64 pteflags)
294 #endif /* CONFIG_PPC_MEM_KEYS */
296 static inline int arch_dup_mmap(struct mm_struct *oldmm,
297 struct mm_struct *mm)
299 arch_dup_pkeys(oldmm, mm);
303 #endif /* __KERNEL__ */
304 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */