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_new(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_newdev(struct mm_struct *mm, unsigned long ua, 28 unsigned long entries, unsigned long dev_hpa, 29 struct mm_iommu_table_group_mem_t **pmem); 30 extern long mm_iommu_put(struct mm_struct *mm, 31 struct mm_iommu_table_group_mem_t *mem); 32 extern void mm_iommu_init(struct mm_struct *mm); 33 extern void mm_iommu_cleanup(struct mm_struct *mm); 34 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, 35 unsigned long ua, unsigned long size); 36 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm( 37 struct mm_struct *mm, unsigned long ua, unsigned long size); 38 extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm, 39 unsigned long ua, unsigned long entries); 40 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 41 unsigned long ua, unsigned int pageshift, unsigned long *hpa); 42 extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem, 43 unsigned long ua, unsigned int pageshift, unsigned long *hpa); 44 extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua); 45 extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, 46 unsigned int pageshift, unsigned long *size); 47 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 48 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 49 #else 50 static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, 51 unsigned int pageshift, unsigned long *size) 52 { 53 return false; 54 } 55 #endif 56 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 57 extern void set_context(unsigned long id, pgd_t *pgd); 58 59 #ifdef CONFIG_PPC_BOOK3S_64 60 extern void radix__switch_mmu_context(struct mm_struct *prev, 61 struct mm_struct *next); 62 static inline void switch_mmu_context(struct mm_struct *prev, 63 struct mm_struct *next, 64 struct task_struct *tsk) 65 { 66 if (radix_enabled()) 67 return radix__switch_mmu_context(prev, next); 68 return switch_slb(tsk, next); 69 } 70 71 extern int hash__alloc_context_id(void); 72 extern void hash__reserve_context_id(int id); 73 extern void __destroy_context(int context_id); 74 static inline void mmu_context_init(void) { } 75 76 static inline int alloc_extended_context(struct mm_struct *mm, 77 unsigned long ea) 78 { 79 int context_id; 80 81 int index = ea >> MAX_EA_BITS_PER_CONTEXT; 82 83 context_id = hash__alloc_context_id(); 84 if (context_id < 0) 85 return context_id; 86 87 VM_WARN_ON(mm->context.extended_id[index]); 88 mm->context.extended_id[index] = context_id; 89 return context_id; 90 } 91 92 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) 93 { 94 int context_id; 95 96 context_id = get_user_context(&mm->context, ea); 97 if (!context_id) 98 return true; 99 return false; 100 } 101 102 #else 103 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, 104 struct task_struct *tsk); 105 extern unsigned long __init_new_context(void); 106 extern void __destroy_context(unsigned long context_id); 107 extern void mmu_context_init(void); 108 static inline int alloc_extended_context(struct mm_struct *mm, 109 unsigned long ea) 110 { 111 /* non book3s_64 should never find this called */ 112 WARN_ON(1); 113 return -ENOMEM; 114 } 115 116 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) 117 { 118 return false; 119 } 120 #endif 121 122 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU) 123 extern void radix_kvm_prefetch_workaround(struct mm_struct *mm); 124 #else 125 static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { } 126 #endif 127 128 extern void switch_cop(struct mm_struct *next); 129 extern int use_cop(unsigned long acop, struct mm_struct *mm); 130 extern void drop_cop(unsigned long acop, struct mm_struct *mm); 131 132 #ifdef CONFIG_PPC_BOOK3S_64 133 static inline void inc_mm_active_cpus(struct mm_struct *mm) 134 { 135 atomic_inc(&mm->context.active_cpus); 136 } 137 138 static inline void dec_mm_active_cpus(struct mm_struct *mm) 139 { 140 atomic_dec(&mm->context.active_cpus); 141 } 142 143 static inline void mm_context_add_copro(struct mm_struct *mm) 144 { 145 /* 146 * If any copro is in use, increment the active CPU count 147 * in order to force TLB invalidations to be global as to 148 * propagate to the Nest MMU. 149 */ 150 if (atomic_inc_return(&mm->context.copros) == 1) 151 inc_mm_active_cpus(mm); 152 } 153 154 static inline void mm_context_remove_copro(struct mm_struct *mm) 155 { 156 int c; 157 158 /* 159 * When removing the last copro, we need to broadcast a global 160 * flush of the full mm, as the next TLBI may be local and the 161 * nMMU and/or PSL need to be cleaned up. 162 * 163 * Both the 'copros' and 'active_cpus' counts are looked at in 164 * flush_all_mm() to determine the scope (local/global) of the 165 * TLBIs, so we need to flush first before decrementing 166 * 'copros'. If this API is used by several callers for the 167 * same context, it can lead to over-flushing. It's hopefully 168 * not common enough to be a problem. 169 * 170 * Skip on hash, as we don't know how to do the proper flush 171 * for the time being. Invalidations will remain global if 172 * used on hash. Note that we can't drop 'copros' either, as 173 * it could make some invalidations local with no flush 174 * in-between. 175 */ 176 if (radix_enabled()) { 177 flush_all_mm(mm); 178 179 c = atomic_dec_if_positive(&mm->context.copros); 180 /* Detect imbalance between add and remove */ 181 WARN_ON(c < 0); 182 183 if (c == 0) 184 dec_mm_active_cpus(mm); 185 } 186 } 187 #else 188 static inline void inc_mm_active_cpus(struct mm_struct *mm) { } 189 static inline void dec_mm_active_cpus(struct mm_struct *mm) { } 190 static inline void mm_context_add_copro(struct mm_struct *mm) { } 191 static inline void mm_context_remove_copro(struct mm_struct *mm) { } 192 #endif 193 194 195 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, 196 struct task_struct *tsk); 197 198 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 199 struct task_struct *tsk) 200 { 201 unsigned long flags; 202 203 local_irq_save(flags); 204 switch_mm_irqs_off(prev, next, tsk); 205 local_irq_restore(flags); 206 } 207 #define switch_mm_irqs_off switch_mm_irqs_off 208 209 210 #define deactivate_mm(tsk,mm) do { } while (0) 211 212 /* 213 * After we have set current->mm to a new value, this activates 214 * the context for the new mm so we see the new mappings. 215 */ 216 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 217 { 218 switch_mm(prev, next, current); 219 } 220 221 /* We don't currently use enter_lazy_tlb() for anything */ 222 static inline void enter_lazy_tlb(struct mm_struct *mm, 223 struct task_struct *tsk) 224 { 225 /* 64-bit Book3E keeps track of current PGD in the PACA */ 226 #ifdef CONFIG_PPC_BOOK3E_64 227 get_paca()->pgd = NULL; 228 #endif 229 } 230 231 #ifdef CONFIG_PPC_BOOK3E_64 232 static inline void arch_exit_mmap(struct mm_struct *mm) 233 { 234 } 235 #else 236 extern void arch_exit_mmap(struct mm_struct *mm); 237 #endif 238 239 static inline void arch_unmap(struct mm_struct *mm, 240 struct vm_area_struct *vma, 241 unsigned long start, unsigned long end) 242 { 243 if (start <= mm->context.vdso_base && mm->context.vdso_base < end) 244 mm->context.vdso_base = 0; 245 } 246 247 static inline void arch_bprm_mm_init(struct mm_struct *mm, 248 struct vm_area_struct *vma) 249 { 250 } 251 252 #ifdef CONFIG_PPC_MEM_KEYS 253 bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, 254 bool execute, bool foreign); 255 void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm); 256 #else /* CONFIG_PPC_MEM_KEYS */ 257 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 258 bool write, bool execute, bool foreign) 259 { 260 /* by default, allow everything */ 261 return true; 262 } 263 264 #define pkey_mm_init(mm) 265 #define thread_pkey_regs_save(thread) 266 #define thread_pkey_regs_restore(new_thread, old_thread) 267 #define thread_pkey_regs_init(thread) 268 #define arch_dup_pkeys(oldmm, mm) 269 270 static inline u64 pte_to_hpte_pkey_bits(u64 pteflags) 271 { 272 return 0x0UL; 273 } 274 275 #endif /* CONFIG_PPC_MEM_KEYS */ 276 277 static inline int arch_dup_mmap(struct mm_struct *oldmm, 278 struct mm_struct *mm) 279 { 280 arch_dup_pkeys(oldmm, mm); 281 return 0; 282 } 283 284 #endif /* __KERNEL__ */ 285 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 286