arch/powerpc/include/asm/mmu_context.h

   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 long *hpa);
  39 extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,
  40                 unsigned long ua, 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);
  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);
  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
  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 #ifdef CONFIG_PPC_BOOK3S_64
  82 static inline void inc_mm_active_cpus(struct mm_struct *mm)
  83 {
  84         atomic_inc(&mm->context.active_cpus);
  85 }
  86
  87 static inline void dec_mm_active_cpus(struct mm_struct *mm)
  88 {
  89         atomic_dec(&mm->context.active_cpus);
  90 }
  91
  92 static inline void mm_context_add_copro(struct mm_struct *mm)
  93 {
  94         /*
  95          * If any copro is in use, increment the active CPU count
  96          * in order to force TLB invalidations to be global as to
  97          * propagate to the Nest MMU.
  98          */
  99         if (atomic_inc_return(&mm->context.copros) == 1)
 100                 inc_mm_active_cpus(mm);
 101 }
 102
 103 static inline void mm_context_remove_copro(struct mm_struct *mm)
 104 {
 105         int c;
 106
 107         c = atomic_dec_if_positive(&mm->context.copros);
 108
 109         /* Detect imbalance between add and remove */
 110         WARN_ON(c < 0);
 111
 112         /*
 113          * Need to broadcast a global flush of the full mm before
 114          * decrementing active_cpus count, as the next TLBI may be
 115          * local and the nMMU and/or PSL need to be cleaned up.
 116          * Should be rare enough so that it's acceptable.
 117          *
 118          * Skip on hash, as we don't know how to do the proper flush
 119          * for the time being. Invalidations will remain global if
 120          * used on hash.
 121          */
 122         if (c == 0 && radix_enabled()) {
 123                 flush_all_mm(mm);
 124                 dec_mm_active_cpus(mm);
 125         }
 126 }
 127 #else
 128 static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
 129 static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
 130 static inline void mm_context_add_copro(struct mm_struct *mm) { }
 131 static inline void mm_context_remove_copro(struct mm_struct *mm) { }
 132 #endif
 133
 134
 135 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
 136                                struct task_struct *tsk);
 137
 138 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 139                              struct task_struct *tsk)
 140 {
 141         unsigned long flags;
 142
 143         local_irq_save(flags);
 144         switch_mm_irqs_off(prev, next, tsk);
 145         local_irq_restore(flags);
 146 }
 147 #define switch_mm_irqs_off switch_mm_irqs_off
 148
 149
 150 #define deactivate_mm(tsk,mm)   do { } while (0)
 151
 152 /*
 153  * After we have set current->mm to a new value, this activates
 154  * the context for the new mm so we see the new mappings.
 155  */
 156 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 157 {
 158         switch_mm(prev, next, current);
 159 }
 160
 161 /* We don't currently use enter_lazy_tlb() for anything */
 162 static inline void enter_lazy_tlb(struct mm_struct *mm,
 163                                   struct task_struct *tsk)
 164 {
 165         /* 64-bit Book3E keeps track of current PGD in the PACA */
 166 #ifdef CONFIG_PPC_BOOK3E_64
 167         get_paca()->pgd = NULL;
 168 #endif
 169 }
 170
 171 static inline int arch_dup_mmap(struct mm_struct *oldmm,
 172                                 struct mm_struct *mm)
 173 {
 174         return 0;
 175 }
 176
 177 #ifndef CONFIG_PPC_BOOK3S_64
 178 static inline void arch_exit_mmap(struct mm_struct *mm)
 179 {
 180 }
 181 #else
 182 extern void arch_exit_mmap(struct mm_struct *mm);
 183 #endif
 184
 185 static inline void arch_unmap(struct mm_struct *mm,
 186                               struct vm_area_struct *vma,
 187                               unsigned long start, unsigned long end)
 188 {
 189         if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
 190                 mm->context.vdso_base = 0;
 191 }
 192
 193 static inline void arch_bprm_mm_init(struct mm_struct *mm,
 194                                      struct vm_area_struct *vma)
 195 {
 196 }
 197
 198 #ifdef CONFIG_PPC_MEM_KEYS
 199 bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
 200                                bool execute, bool foreign);
 201 #else /* CONFIG_PPC_MEM_KEYS */
 202 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
 203                 bool write, bool execute, bool foreign)
 204 {
 205         /* by default, allow everything */
 206         return true;
 207 }
 208
 209 #define pkey_mm_init(mm)
 210 #define thread_pkey_regs_save(thread)
 211 #define thread_pkey_regs_restore(new_thread, old_thread)
 212 #define thread_pkey_regs_init(thread)
 213
 214 static inline int vma_pkey(struct vm_area_struct *vma)
 215 {
 216         return 0;
 217 }
 218
 219 static inline u64 pte_to_hpte_pkey_bits(u64 pteflags)
 220 {
 221         return 0x0UL;
 222 }
 223
 224 #endif /* CONFIG_PPC_MEM_KEYS */
 225
 226 #endif /* __KERNEL__ */
 227 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */