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_lookup_rm( 38 struct mm_struct *mm, unsigned long ua, unsigned long size); 39 extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm, 40 unsigned long ua, unsigned long entries); 41 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 42 unsigned long ua, unsigned int pageshift, unsigned long *hpa); 43 extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem, 44 unsigned long ua, unsigned int pageshift, unsigned long *hpa); 45 extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua); 46 extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, 47 unsigned int pageshift, unsigned long *size); 48 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 49 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 50 #else 51 static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, 52 unsigned int pageshift, unsigned long *size) 53 { 54 return false; 55 } 56 static inline void mm_iommu_init(struct mm_struct *mm) { } 57 #endif 58 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 59 60 #ifdef CONFIG_PPC_BOOK3S_64 61 extern void radix__switch_mmu_context(struct mm_struct *prev, 62 struct mm_struct *next); 63 static inline void switch_mmu_context(struct mm_struct *prev, 64 struct mm_struct *next, 65 struct task_struct *tsk) 66 { 67 if (radix_enabled()) 68 return radix__switch_mmu_context(prev, next); 69 return switch_slb(tsk, next); 70 } 71 72 extern int hash__alloc_context_id(void); 73 void __init hash__reserve_context_id(int id); 74 extern void __destroy_context(int context_id); 75 static inline void mmu_context_init(void) { } 76 77 #ifdef CONFIG_PPC_64S_HASH_MMU 78 static inline int alloc_extended_context(struct mm_struct *mm, 79 unsigned long ea) 80 { 81 int context_id; 82 83 int index = ea >> MAX_EA_BITS_PER_CONTEXT; 84 85 context_id = hash__alloc_context_id(); 86 if (context_id < 0) 87 return context_id; 88 89 VM_WARN_ON(mm->context.extended_id[index]); 90 mm->context.extended_id[index] = context_id; 91 return context_id; 92 } 93 94 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) 95 { 96 int context_id; 97 98 context_id = get_user_context(&mm->context, ea); 99 if (!context_id) 100 return true; 101 return false; 102 } 103 #endif 104 105 #else 106 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, 107 struct task_struct *tsk); 108 extern unsigned long __init_new_context(void); 109 extern void __destroy_context(unsigned long context_id); 110 extern void mmu_context_init(void); 111 static inline int alloc_extended_context(struct mm_struct *mm, 112 unsigned long ea) 113 { 114 /* non book3s_64 should never find this called */ 115 WARN_ON(1); 116 return -ENOMEM; 117 } 118 119 static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) 120 { 121 return false; 122 } 123 #endif 124 125 extern void switch_cop(struct mm_struct *next); 126 extern int use_cop(unsigned long acop, struct mm_struct *mm); 127 extern void drop_cop(unsigned long acop, struct mm_struct *mm); 128 129 #ifdef CONFIG_PPC_BOOK3S_64 130 static inline void inc_mm_active_cpus(struct mm_struct *mm) 131 { 132 atomic_inc(&mm->context.active_cpus); 133 } 134 135 static inline void dec_mm_active_cpus(struct mm_struct *mm) 136 { 137 atomic_dec(&mm->context.active_cpus); 138 } 139 140 static inline void mm_context_add_copro(struct mm_struct *mm) 141 { 142 /* 143 * If any copro is in use, increment the active CPU count 144 * in order to force TLB invalidations to be global as to 145 * propagate to the Nest MMU. 146 */ 147 if (atomic_inc_return(&mm->context.copros) == 1) 148 inc_mm_active_cpus(mm); 149 } 150 151 static inline void mm_context_remove_copro(struct mm_struct *mm) 152 { 153 int c; 154 155 /* 156 * When removing the last copro, we need to broadcast a global 157 * flush of the full mm, as the next TLBI may be local and the 158 * nMMU and/or PSL need to be cleaned up. 159 * 160 * Both the 'copros' and 'active_cpus' counts are looked at in 161 * flush_all_mm() to determine the scope (local/global) of the 162 * TLBIs, so we need to flush first before decrementing 163 * 'copros'. If this API is used by several callers for the 164 * same context, it can lead to over-flushing. It's hopefully 165 * not common enough to be a problem. 166 * 167 * Skip on hash, as we don't know how to do the proper flush 168 * for the time being. Invalidations will remain global if 169 * used on hash. Note that we can't drop 'copros' either, as 170 * it could make some invalidations local with no flush 171 * in-between. 172 */ 173 if (radix_enabled()) { 174 flush_all_mm(mm); 175 176 c = atomic_dec_if_positive(&mm->context.copros); 177 /* Detect imbalance between add and remove */ 178 WARN_ON(c < 0); 179 180 if (c == 0) 181 dec_mm_active_cpus(mm); 182 } 183 } 184 185 /* 186 * vas_windows counter shows number of open windows in the mm 187 * context. During context switch, use this counter to clear the 188 * foreign real address mapping (CP_ABORT) for the thread / process 189 * that intend to use COPY/PASTE. When a process closes all windows, 190 * disable CP_ABORT which is expensive to run. 191 * 192 * For user context, register a copro so that TLBIs are seen by the 193 * nest MMU. mm_context_add/remove_vas_window() are used only for user 194 * space windows. 195 */ 196 static inline void mm_context_add_vas_window(struct mm_struct *mm) 197 { 198 atomic_inc(&mm->context.vas_windows); 199 mm_context_add_copro(mm); 200 } 201 202 static inline void mm_context_remove_vas_window(struct mm_struct *mm) 203 { 204 int v; 205 206 mm_context_remove_copro(mm); 207 v = atomic_dec_if_positive(&mm->context.vas_windows); 208 209 /* Detect imbalance between add and remove */ 210 WARN_ON(v < 0); 211 } 212 #else 213 static inline void inc_mm_active_cpus(struct mm_struct *mm) { } 214 static inline void dec_mm_active_cpus(struct mm_struct *mm) { } 215 static inline void mm_context_add_copro(struct mm_struct *mm) { } 216 static inline void mm_context_remove_copro(struct mm_struct *mm) { } 217 #endif 218 219 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU) 220 void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid, 221 unsigned long type, unsigned long pg_sizes, 222 unsigned long start, unsigned long end); 223 #else 224 static inline void do_h_rpt_invalidate_prt(unsigned long pid, 225 unsigned long lpid, 226 unsigned long type, 227 unsigned long pg_sizes, 228 unsigned long start, 229 unsigned long end) { } 230 #endif 231 232 extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, 233 struct task_struct *tsk); 234 235 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 236 struct task_struct *tsk) 237 { 238 unsigned long flags; 239 240 local_irq_save(flags); 241 switch_mm_irqs_off(prev, next, tsk); 242 local_irq_restore(flags); 243 } 244 #define switch_mm_irqs_off switch_mm_irqs_off 245 246 /* 247 * After we have set current->mm to a new value, this activates 248 * the context for the new mm so we see the new mappings. 249 */ 250 #define activate_mm activate_mm 251 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 252 { 253 switch_mm_irqs_off(prev, next, current); 254 } 255 256 /* We don't currently use enter_lazy_tlb() for anything */ 257 #ifdef CONFIG_PPC_BOOK3E_64 258 #define enter_lazy_tlb enter_lazy_tlb 259 static inline void enter_lazy_tlb(struct mm_struct *mm, 260 struct task_struct *tsk) 261 { 262 /* 64-bit Book3E keeps track of current PGD in the PACA */ 263 get_paca()->pgd = NULL; 264 } 265 #endif 266 267 extern void arch_exit_mmap(struct mm_struct *mm); 268 269 static inline void arch_unmap(struct mm_struct *mm, 270 unsigned long start, unsigned long end) 271 { 272 unsigned long vdso_base = (unsigned long)mm->context.vdso; 273 274 if (start <= vdso_base && vdso_base < end) 275 mm->context.vdso = NULL; 276 } 277 278 #ifdef CONFIG_PPC_MEM_KEYS 279 bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, 280 bool execute, bool foreign); 281 void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm); 282 #else /* CONFIG_PPC_MEM_KEYS */ 283 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 284 bool write, bool execute, bool foreign) 285 { 286 /* by default, allow everything */ 287 return true; 288 } 289 290 #define pkey_mm_init(mm) 291 #define arch_dup_pkeys(oldmm, mm) 292 293 static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags) 294 { 295 return 0x0UL; 296 } 297 298 #endif /* CONFIG_PPC_MEM_KEYS */ 299 300 static inline int arch_dup_mmap(struct mm_struct *oldmm, 301 struct mm_struct *mm) 302 { 303 arch_dup_pkeys(oldmm, mm); 304 return 0; 305 } 306 307 #include <asm-generic/mmu_context.h> 308 309 #endif /* __KERNEL__ */ 310 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 311