1 #ifndef __ASM_POWERPC_MMU_CONTEXT_H 2 #define __ASM_POWERPC_MMU_CONTEXT_H 3 #ifdef __KERNEL__ 4 5 #include <linux/kernel.h> 6 #include <linux/mm.h> 7 #include <linux/sched.h> 8 #include <linux/spinlock.h> 9 #include <asm/mmu.h> 10 #include <asm/cputable.h> 11 #include <asm/cputhreads.h> 12 13 /* 14 * Most if the context management is out of line 15 */ 16 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); 17 extern void destroy_context(struct mm_struct *mm); 18 #ifdef CONFIG_SPAPR_TCE_IOMMU 19 struct mm_iommu_table_group_mem_t; 20 21 extern int isolate_lru_page(struct page *page); /* from internal.h */ 22 extern bool mm_iommu_preregistered(struct mm_struct *mm); 23 extern long mm_iommu_get(struct mm_struct *mm, 24 unsigned long ua, unsigned long entries, 25 struct mm_iommu_table_group_mem_t **pmem); 26 extern long mm_iommu_put(struct mm_struct *mm, 27 struct mm_iommu_table_group_mem_t *mem); 28 extern void mm_iommu_init(struct mm_struct *mm); 29 extern void mm_iommu_cleanup(struct mm_struct *mm); 30 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, 31 unsigned long ua, unsigned long size); 32 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm( 33 struct mm_struct *mm, unsigned long ua, unsigned long size); 34 extern struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm, 35 unsigned long ua, unsigned long entries); 36 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 37 unsigned long ua, unsigned long *hpa); 38 extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem, 39 unsigned long ua, unsigned long *hpa); 40 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 41 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 42 #endif 43 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 44 extern void set_context(unsigned long id, pgd_t *pgd); 45 46 #ifdef CONFIG_PPC_BOOK3S_64 47 extern void radix__switch_mmu_context(struct mm_struct *prev, 48 struct mm_struct *next); 49 static inline void switch_mmu_context(struct mm_struct *prev, 50 struct mm_struct *next, 51 struct task_struct *tsk) 52 { 53 if (radix_enabled()) 54 return radix__switch_mmu_context(prev, next); 55 return switch_slb(tsk, next); 56 } 57 58 extern int hash__alloc_context_id(void); 59 extern void hash__reserve_context_id(int id); 60 extern void __destroy_context(int context_id); 61 static inline void mmu_context_init(void) { } 62 #else 63 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, 64 struct task_struct *tsk); 65 extern unsigned long __init_new_context(void); 66 extern void __destroy_context(unsigned long context_id); 67 extern void mmu_context_init(void); 68 #endif 69 70 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU) 71 extern void radix_kvm_prefetch_workaround(struct mm_struct *mm); 72 #else 73 static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { } 74 #endif 75 76 extern void switch_cop(struct mm_struct *next); 77 extern int use_cop(unsigned long acop, struct mm_struct *mm); 78 extern void drop_cop(unsigned long acop, struct mm_struct *mm); 79 80 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, 81 struct task_struct *tsk); 82 83 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 84 struct task_struct *tsk) 85 { 86 unsigned long flags; 87 88 local_irq_save(flags); 89 switch_mm_irqs_off(prev, next, tsk); 90 local_irq_restore(flags); 91 } 92 #define switch_mm_irqs_off switch_mm_irqs_off 93 94 95 #define deactivate_mm(tsk,mm) do { } while (0) 96 97 /* 98 * After we have set current->mm to a new value, this activates 99 * the context for the new mm so we see the new mappings. 100 */ 101 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 102 { 103 switch_mm(prev, next, current); 104 } 105 106 /* We don't currently use enter_lazy_tlb() for anything */ 107 static inline void enter_lazy_tlb(struct mm_struct *mm, 108 struct task_struct *tsk) 109 { 110 /* 64-bit Book3E keeps track of current PGD in the PACA */ 111 #ifdef CONFIG_PPC_BOOK3E_64 112 get_paca()->pgd = NULL; 113 #endif 114 } 115 116 static inline void arch_dup_mmap(struct mm_struct *oldmm, 117 struct mm_struct *mm) 118 { 119 } 120 121 static inline void arch_exit_mmap(struct mm_struct *mm) 122 { 123 } 124 125 static inline void arch_unmap(struct mm_struct *mm, 126 struct vm_area_struct *vma, 127 unsigned long start, unsigned long end) 128 { 129 if (start <= mm->context.vdso_base && mm->context.vdso_base < end) 130 mm->context.vdso_base = 0; 131 } 132 133 static inline void arch_bprm_mm_init(struct mm_struct *mm, 134 struct vm_area_struct *vma) 135 { 136 } 137 138 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 139 bool write, bool execute, bool foreign) 140 { 141 /* by default, allow everything */ 142 return true; 143 } 144 #endif /* __KERNEL__ */ 145 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 146