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 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
  82                                struct task_struct *tsk);
  83
  84 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  85                              struct task_struct *tsk)
  86 {
  87         unsigned long flags;
  88
  89         local_irq_save(flags);
  90         switch_mm_irqs_off(prev, next, tsk);
  91         local_irq_restore(flags);
  92 }
  93 #define switch_mm_irqs_off switch_mm_irqs_off
  94
  95
  96 #define deactivate_mm(tsk,mm)   do { } while (0)
  97
  98 /*
  99  * After we have set current->mm to a new value, this activates
 100  * the context for the new mm so we see the new mappings.
 101  */
 102 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 103 {
 104         switch_mm(prev, next, current);
 105 }
 106
 107 /* We don't currently use enter_lazy_tlb() for anything */
 108 static inline void enter_lazy_tlb(struct mm_struct *mm,
 109                                   struct task_struct *tsk)
 110 {
 111         /* 64-bit Book3E keeps track of current PGD in the PACA */
 112 #ifdef CONFIG_PPC_BOOK3E_64
 113         get_paca()->pgd = NULL;
 114 #endif
 115 }
 116
 117 static inline int arch_dup_mmap(struct mm_struct *oldmm,
 118                                 struct mm_struct *mm)
 119 {
 120         return 0;
 121 }
 122
 123 static inline void arch_exit_mmap(struct mm_struct *mm)
 124 {
 125 }
 126
 127 static inline void arch_unmap(struct mm_struct *mm,
 128                               struct vm_area_struct *vma,
 129                               unsigned long start, unsigned long end)
 130 {
 131         if (start <= mm->context.vdso_base && mm->context.vdso_base < end)
 132                 mm->context.vdso_base = 0;
 133 }
 134
 135 static inline void arch_bprm_mm_init(struct mm_struct *mm,
 136                                      struct vm_area_struct *vma)
 137 {
 138 }
 139
 140 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
 141                 bool write, bool execute, bool foreign)
 142 {
 143         /* by default, allow everything */
 144         return true;
 145 }
 146 #endif /* __KERNEL__ */
 147 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */