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 #define init_new_context init_new_context
18 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
19 #define destroy_context destroy_context
20 extern void destroy_context(struct mm_struct *mm);
21 #ifdef CONFIG_SPAPR_TCE_IOMMU
22 struct mm_iommu_table_group_mem_t;
24 extern bool mm_iommu_preregistered(struct mm_struct *mm);
25 extern long mm_iommu_new(struct mm_struct *mm,
26 unsigned long ua, unsigned long entries,
27 struct mm_iommu_table_group_mem_t **pmem);
28 extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua,
29 unsigned long entries, unsigned long dev_hpa,
30 struct mm_iommu_table_group_mem_t **pmem);
31 extern long mm_iommu_put(struct mm_struct *mm,
32 struct mm_iommu_table_group_mem_t *mem);
33 extern void mm_iommu_init(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_get(struct mm_struct *mm,
37 unsigned long ua, unsigned long entries);
38 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
39 unsigned long ua, unsigned int pageshift, unsigned long *hpa);
40 extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
41 unsigned int pageshift, unsigned long *size);
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 static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
46 unsigned int pageshift, unsigned long *size)
50 static inline void mm_iommu_init(struct mm_struct *mm) { }
52 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
54 #ifdef CONFIG_PPC_BOOK3S_64
55 extern void radix__switch_mmu_context(struct mm_struct *prev,
56 struct mm_struct *next);
57 static inline void switch_mmu_context(struct mm_struct *prev,
58 struct mm_struct *next,
59 struct task_struct *tsk)
62 return radix__switch_mmu_context(prev, next);
63 return switch_slb(tsk, next);
66 extern int hash__alloc_context_id(void);
67 void __init hash__reserve_context_id(int id);
68 extern void __destroy_context(int context_id);
69 static inline void mmu_context_init(void) { }
71 #ifdef CONFIG_PPC_64S_HASH_MMU
72 static inline int alloc_extended_context(struct mm_struct *mm,
77 int index = ea >> MAX_EA_BITS_PER_CONTEXT;
79 context_id = hash__alloc_context_id();
83 VM_WARN_ON(mm->context.extended_id[index]);
84 mm->context.extended_id[index] = context_id;
88 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
92 context_id = get_user_context(&mm->context, ea);
100 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
101 struct task_struct *tsk);
102 extern unsigned long __init_new_context(void);
103 extern void __destroy_context(unsigned long context_id);
104 extern void mmu_context_init(void);
105 static inline int alloc_extended_context(struct mm_struct *mm,
108 /* non book3s_64 should never find this called */
113 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
119 extern int use_cop(unsigned long acop, struct mm_struct *mm);
120 extern void drop_cop(unsigned long acop, struct mm_struct *mm);
122 #ifdef CONFIG_PPC_BOOK3S_64
123 static inline void inc_mm_active_cpus(struct mm_struct *mm)
125 atomic_inc(&mm->context.active_cpus);
128 static inline void dec_mm_active_cpus(struct mm_struct *mm)
130 atomic_dec(&mm->context.active_cpus);
133 static inline void mm_context_add_copro(struct mm_struct *mm)
136 * If any copro is in use, increment the active CPU count
137 * in order to force TLB invalidations to be global as to
138 * propagate to the Nest MMU.
140 if (atomic_inc_return(&mm->context.copros) == 1)
141 inc_mm_active_cpus(mm);
144 static inline void mm_context_remove_copro(struct mm_struct *mm)
149 * When removing the last copro, we need to broadcast a global
150 * flush of the full mm, as the next TLBI may be local and the
151 * nMMU and/or PSL need to be cleaned up.
153 * Both the 'copros' and 'active_cpus' counts are looked at in
154 * flush_all_mm() to determine the scope (local/global) of the
155 * TLBIs, so we need to flush first before decrementing
156 * 'copros'. If this API is used by several callers for the
157 * same context, it can lead to over-flushing. It's hopefully
158 * not common enough to be a problem.
160 * Skip on hash, as we don't know how to do the proper flush
161 * for the time being. Invalidations will remain global if
162 * used on hash. Note that we can't drop 'copros' either, as
163 * it could make some invalidations local with no flush
166 if (radix_enabled()) {
169 c = atomic_dec_if_positive(&mm->context.copros);
170 /* Detect imbalance between add and remove */
174 dec_mm_active_cpus(mm);
179 * vas_windows counter shows number of open windows in the mm
180 * context. During context switch, use this counter to clear the
181 * foreign real address mapping (CP_ABORT) for the thread / process
182 * that intend to use COPY/PASTE. When a process closes all windows,
183 * disable CP_ABORT which is expensive to run.
185 * For user context, register a copro so that TLBIs are seen by the
186 * nest MMU. mm_context_add/remove_vas_window() are used only for user
189 static inline void mm_context_add_vas_window(struct mm_struct *mm)
191 atomic_inc(&mm->context.vas_windows);
192 mm_context_add_copro(mm);
195 static inline void mm_context_remove_vas_window(struct mm_struct *mm)
199 mm_context_remove_copro(mm);
200 v = atomic_dec_if_positive(&mm->context.vas_windows);
202 /* Detect imbalance between add and remove */
206 static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
207 static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
208 static inline void mm_context_add_copro(struct mm_struct *mm) { }
209 static inline void mm_context_remove_copro(struct mm_struct *mm) { }
212 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
213 void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid,
214 unsigned long type, unsigned long pg_sizes,
215 unsigned long start, unsigned long end);
217 static inline void do_h_rpt_invalidate_prt(unsigned long pid,
220 unsigned long pg_sizes,
222 unsigned long end) { }
225 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
226 struct task_struct *tsk);
228 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
229 struct task_struct *tsk)
233 local_irq_save(flags);
234 switch_mm_irqs_off(prev, next, tsk);
235 local_irq_restore(flags);
237 #define switch_mm_irqs_off switch_mm_irqs_off
240 * After we have set current->mm to a new value, this activates
241 * the context for the new mm so we see the new mappings.
243 #define activate_mm activate_mm
244 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
246 switch_mm_irqs_off(prev, next, current);
249 /* We don't currently use enter_lazy_tlb() for anything */
250 #ifdef CONFIG_PPC_BOOK3E_64
251 #define enter_lazy_tlb enter_lazy_tlb
252 static inline void enter_lazy_tlb(struct mm_struct *mm,
253 struct task_struct *tsk)
255 /* 64-bit Book3E keeps track of current PGD in the PACA */
256 get_paca()->pgd = NULL;
260 extern void arch_exit_mmap(struct mm_struct *mm);
262 static inline void arch_unmap(struct mm_struct *mm,
263 unsigned long start, unsigned long end)
265 unsigned long vdso_base = (unsigned long)mm->context.vdso;
267 if (start <= vdso_base && vdso_base < end)
268 mm->context.vdso = NULL;
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 arch_dup_pkeys(oldmm, mm)
286 static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags)
291 #endif /* CONFIG_PPC_MEM_KEYS */
293 static inline int arch_dup_mmap(struct mm_struct *oldmm,
294 struct mm_struct *mm)
296 arch_dup_pkeys(oldmm, mm);
300 #include <asm-generic/mmu_context.h>
302 #endif /* __KERNEL__ */
303 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */