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 */ 228