mmu_context.h (9271B)
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 18extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); 19#define destroy_context destroy_context 20extern void destroy_context(struct mm_struct *mm); 21#ifdef CONFIG_SPAPR_TCE_IOMMU 22struct mm_iommu_table_group_mem_t; 23 24extern bool mm_iommu_preregistered(struct mm_struct *mm); 25extern long mm_iommu_new(struct mm_struct *mm, 26 unsigned long ua, unsigned long entries, 27 struct mm_iommu_table_group_mem_t **pmem); 28extern 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); 31extern long mm_iommu_put(struct mm_struct *mm, 32 struct mm_iommu_table_group_mem_t *mem); 33extern void mm_iommu_init(struct mm_struct *mm); 34extern void mm_iommu_cleanup(struct mm_struct *mm); 35extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, 36 unsigned long ua, unsigned long size); 37extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm, 38 unsigned long ua, unsigned long entries); 39extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 40 unsigned long ua, unsigned int pageshift, unsigned long *hpa); 41extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, 42 unsigned int pageshift, unsigned long *size); 43extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 44extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 45#else 46static 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} 51static inline void mm_iommu_init(struct mm_struct *mm) { } 52#endif 53extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 54 55#ifdef CONFIG_PPC_BOOK3S_64 56extern void radix__switch_mmu_context(struct mm_struct *prev, 57 struct mm_struct *next); 58static 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 67extern int hash__alloc_context_id(void); 68void __init hash__reserve_context_id(int id); 69extern void __destroy_context(int context_id); 70static inline void mmu_context_init(void) { } 71 72#ifdef CONFIG_PPC_64S_HASH_MMU 73static 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 89static 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 101extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, 102 struct task_struct *tsk); 103extern unsigned long __init_new_context(void); 104extern void __destroy_context(unsigned long context_id); 105extern void mmu_context_init(void); 106static 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 114static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) 115{ 116 return false; 117} 118#endif 119 120extern void switch_cop(struct mm_struct *next); 121extern int use_cop(unsigned long acop, struct mm_struct *mm); 122extern void drop_cop(unsigned long acop, struct mm_struct *mm); 123 124#ifdef CONFIG_PPC_BOOK3S_64 125static inline void inc_mm_active_cpus(struct mm_struct *mm) 126{ 127 atomic_inc(&mm->context.active_cpus); 128} 129 130static inline void dec_mm_active_cpus(struct mm_struct *mm) 131{ 132 atomic_dec(&mm->context.active_cpus); 133} 134 135static 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 146static 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 */ 191static 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 197static 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 208static inline void inc_mm_active_cpus(struct mm_struct *mm) { } 209static inline void dec_mm_active_cpus(struct mm_struct *mm) { } 210static inline void mm_context_add_copro(struct mm_struct *mm) { } 211static 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) 215void 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 219static 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 227extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, 228 struct task_struct *tsk); 229 230static 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 246static 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 254static 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 262extern void arch_exit_mmap(struct mm_struct *mm); 263 264static 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 274bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, 275 bool execute, bool foreign); 276void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm); 277#else /* CONFIG_PPC_MEM_KEYS */ 278static 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 288static 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 295static 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 */