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 void arch_dup_mmap(struct mm_struct *oldmm, 118 struct mm_struct *mm) 119 { 120 } 121 122 static inline void arch_exit_mmap(struct mm_struct *mm) 123 { 124 } 125 126 static inline void arch_unmap(struct mm_struct *mm, 127 struct vm_area_struct *vma, 128 unsigned long start, unsigned long end) 129 { 130 if (start <= mm->context.vdso_base && mm->context.vdso_base < end) 131 mm->context.vdso_base = 0; 132 } 133 134 static inline void arch_bprm_mm_init(struct mm_struct *mm, 135 struct vm_area_struct *vma) 136 { 137 } 138 139 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 140 bool write, bool execute, bool foreign) 141 { 142 /* by default, allow everything */ 143 return true; 144 } 145 #endif /* __KERNEL__ */ 146 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 147