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 #define init_new_context init_new_context 18 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); 19 #define destroy_context destroy_context 20 extern void destroy_context(struct mm_struct *mm); 21 #ifdef CONFIG_SPAPR_TCE_IOMMU 22 struct mm_iommu_table_group_mem_t; 23 24 extern bool mm_iommu_preregistered(struct mm_struct *mm); 25 extern long mm_iommu_new(struct mm_struct *mm, 26 unsigned long ua, unsigned long entries, 27 struct mm_iommu_table_group_mem_t **pmem); 28 extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua, 29 unsigned long entries, unsigned long dev_hpa, 30 struct mm_iommu_table_group_mem_t **pmem); 31 extern long mm_iommu_put(struct mm_struct *mm, 32 struct mm_iommu_table_group_mem_t *mem); 33 extern void mm_iommu_init(struct mm_struct *mm); 34 extern void mm_iommu_cleanup(struct mm_struct *mm); 35 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, 36 unsigned long ua, unsigned long size); 37 extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm, 38 unsigned long ua, unsigned long entries); 39 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 40 unsigned long ua, unsigned int pageshift, unsigned long *hpa); 41 extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, 42 unsigned int pageshift, unsigned long *size); 43 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 44 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 45 #else 46 static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, 47 unsigned int pageshift, unsigned long *size) 48 { 49 return false; 50 } 51 static inline void mm_iommu_init(struct mm_struct *mm) { } 52 #endif 53 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 54 55 #ifdef CONFIG_PPC_BOOK3S_64 56 extern void radix__switch_mmu_context(struct mm_struct *prev, 57 struct mm_struct *next); 58 static inline void switch_mmu_context(struct mm_struct *prev, 59 struct mm_struct *next, 60 struct task_struct *tsk) 61 { 62 if (radix_enabled()) 63 return radix__switch_mmu_context(prev, next); 64 return switch_slb(tsk, next); 65 } 66 67 extern int hash__alloc_context_id(void); 68 void __init hash__reserve_context_id(int id); 69 extern void __destroy_context(int context_id); 70 static inline void mmu_context_init(void) { } 71 72 #ifdef CONFIG_PPC_64S_HASH_MMU 73 static inline int alloc_extended_context(struct mm_struct *mm, 74 unsigned long ea) 75 { 76 int context_id; 77 78 int index = ea >> MAX_EA_BITS_PER_CONTEXT; 79 80 context_id = hash__alloc_context_id(); 81 if (context_id < 0) 82 return context_id; 83 84 VM_WARN_ON(mm->context.extended_id[index]); 85 mm->context.extended_id[index] = context_id; 86 return context_id; 87 } 88 89 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) 90 { 91 int context_id; 92 93 context_id = get_user_context(&mm->context, ea); 94 if (!context_id) 95 return true; 96 return false; 97 } 98 #endif 99 100 #else 101 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, 102 struct task_struct *tsk); 103 extern unsigned long __init_new_context(void); 104 extern void __destroy_context(unsigned long context_id); 105 extern void mmu_context_init(void); 106 static inline int alloc_extended_context(struct mm_struct *mm, 107 unsigned long ea) 108 { 109 /* non book3s_64 should never find this called */ 110 WARN_ON(1); 111 return -ENOMEM; 112 } 113 114 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) 115 { 116 return false; 117 } 118 #endif 119 120 extern void switch_cop(struct mm_struct *next); 121 extern int use_cop(unsigned long acop, struct mm_struct *mm); 122 extern void drop_cop(unsigned long acop, struct mm_struct *mm); 123 124 #ifdef CONFIG_PPC_BOOK3S_64 125 static inline void inc_mm_active_cpus(struct mm_struct *mm) 126 { 127 atomic_inc(&mm->context.active_cpus); 128 } 129 130 static inline void dec_mm_active_cpus(struct mm_struct *mm) 131 { 132 atomic_dec(&mm->context.active_cpus); 133 } 134 135 static inline void mm_context_add_copro(struct mm_struct *mm) 136 { 137 /* 138 * If any copro is in use, increment the active CPU count 139 * in order to force TLB invalidations to be global as to 140 * propagate to the Nest MMU. 141 */ 142 if (atomic_inc_return(&mm->context.copros) == 1) 143 inc_mm_active_cpus(mm); 144 } 145 146 static inline void mm_context_remove_copro(struct mm_struct *mm) 147 { 148 int c; 149 150 /* 151 * When removing the last copro, we need to broadcast a global 152 * flush of the full mm, as the next TLBI may be local and the 153 * nMMU and/or PSL need to be cleaned up. 154 * 155 * Both the 'copros' and 'active_cpus' counts are looked at in 156 * flush_all_mm() to determine the scope (local/global) of the 157 * TLBIs, so we need to flush first before decrementing 158 * 'copros'. If this API is used by several callers for the 159 * same context, it can lead to over-flushing. It's hopefully 160 * not common enough to be a problem. 161 * 162 * Skip on hash, as we don't know how to do the proper flush 163 * for the time being. Invalidations will remain global if 164 * used on hash. Note that we can't drop 'copros' either, as 165 * it could make some invalidations local with no flush 166 * in-between. 167 */ 168 if (radix_enabled()) { 169 flush_all_mm(mm); 170 171 c = atomic_dec_if_positive(&mm->context.copros); 172 /* Detect imbalance between add and remove */ 173 WARN_ON(c < 0); 174 175 if (c == 0) 176 dec_mm_active_cpus(mm); 177 } 178 } 179 180 /* 181 * vas_windows counter shows number of open windows in the mm 182 * context. During context switch, use this counter to clear the 183 * foreign real address mapping (CP_ABORT) for the thread / process 184 * that intend to use COPY/PASTE. When a process closes all windows, 185 * disable CP_ABORT which is expensive to run. 186 * 187 * For user context, register a copro so that TLBIs are seen by the 188 * nest MMU. mm_context_add/remove_vas_window() are used only for user 189 * space windows. 190 */ 191 static inline void mm_context_add_vas_window(struct mm_struct *mm) 192 { 193 atomic_inc(&mm->context.vas_windows); 194 mm_context_add_copro(mm); 195 } 196 197 static inline void mm_context_remove_vas_window(struct mm_struct *mm) 198 { 199 int v; 200 201 mm_context_remove_copro(mm); 202 v = atomic_dec_if_positive(&mm->context.vas_windows); 203 204 /* Detect imbalance between add and remove */ 205 WARN_ON(v < 0); 206 } 207 #else 208 static inline void inc_mm_active_cpus(struct mm_struct *mm) { } 209 static inline void dec_mm_active_cpus(struct mm_struct *mm) { } 210 static inline void mm_context_add_copro(struct mm_struct *mm) { } 211 static inline void mm_context_remove_copro(struct mm_struct *mm) { } 212 #endif 213 214 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU) 215 void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid, 216 unsigned long type, unsigned long pg_sizes, 217 unsigned long start, unsigned long end); 218 #else 219 static inline void do_h_rpt_invalidate_prt(unsigned long pid, 220 unsigned long lpid, 221 unsigned long type, 222 unsigned long pg_sizes, 223 unsigned long start, 224 unsigned long end) { } 225 #endif 226 227 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, 228 struct task_struct *tsk); 229 230 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 231 struct task_struct *tsk) 232 { 233 unsigned long flags; 234 235 local_irq_save(flags); 236 switch_mm_irqs_off(prev, next, tsk); 237 local_irq_restore(flags); 238 } 239 #define switch_mm_irqs_off switch_mm_irqs_off 240 241 /* 242 * After we have set current->mm to a new value, this activates 243 * the context for the new mm so we see the new mappings. 244 */ 245 #define activate_mm activate_mm 246 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 247 { 248 switch_mm_irqs_off(prev, next, current); 249 } 250 251 /* We don't currently use enter_lazy_tlb() for anything */ 252 #ifdef CONFIG_PPC_BOOK3E_64 253 #define enter_lazy_tlb enter_lazy_tlb 254 static inline void enter_lazy_tlb(struct mm_struct *mm, 255 struct task_struct *tsk) 256 { 257 /* 64-bit Book3E keeps track of current PGD in the PACA */ 258 get_paca()->pgd = NULL; 259 } 260 #endif 261 262 extern void arch_exit_mmap(struct mm_struct *mm); 263 264 static inline void arch_unmap(struct mm_struct *mm, 265 unsigned long start, unsigned long end) 266 { 267 unsigned long vdso_base = (unsigned long)mm->context.vdso; 268 269 if (start <= vdso_base && vdso_base < end) 270 mm->context.vdso = NULL; 271 } 272 273 #ifdef CONFIG_PPC_MEM_KEYS 274 bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, 275 bool execute, bool foreign); 276 void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm); 277 #else /* CONFIG_PPC_MEM_KEYS */ 278 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 279 bool write, bool execute, bool foreign) 280 { 281 /* by default, allow everything */ 282 return true; 283 } 284 285 #define pkey_mm_init(mm) 286 #define arch_dup_pkeys(oldmm, mm) 287 288 static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags) 289 { 290 return 0x0UL; 291 } 292 293 #endif /* CONFIG_PPC_MEM_KEYS */ 294 295 static inline int arch_dup_mmap(struct mm_struct *oldmm, 296 struct mm_struct *mm) 297 { 298 arch_dup_pkeys(oldmm, mm); 299 return 0; 300 } 301 302 #include <asm-generic/mmu_context.h> 303 304 #endif /* __KERNEL__ */ 305 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 306