LXR linux/arch/powerpc/include/asm/mmu

   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 int isolate_lru_page(struct page *page); /* from internal.h */
  25extern bool mm_iommu_preregistered(struct mm_struct *mm);
  26extern long mm_iommu_new(struct mm_struct *mm,
  27                unsigned long ua, unsigned long entries,
  28                struct mm_iommu_table_group_mem_t **pmem);
  29extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua,
  30                unsigned long entries, unsigned long dev_hpa,
  31                struct mm_iommu_table_group_mem_t **pmem);
  32extern long mm_iommu_put(struct mm_struct *mm,
  33                struct mm_iommu_table_group_mem_t *mem);
  34extern void mm_iommu_init(struct mm_struct *mm);
  35extern void mm_iommu_cleanup(struct mm_struct *mm);
  36extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
  37                unsigned long ua, unsigned long size);
  38extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm(
  39                struct mm_struct *mm, unsigned long ua, unsigned long size);
  40extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm,
  41                unsigned long ua, unsigned long entries);
  42extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
  43                unsigned long ua, unsigned int pageshift, unsigned long *hpa);
  44extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem,
  45                unsigned long ua, unsigned int pageshift, unsigned long *hpa);
  46extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua);
  47extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
  48                unsigned int pageshift, unsigned long *size);
  49extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
  50extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
  51#else
  52static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
  53                unsigned int pageshift, unsigned long *size)
  54{
  55        return false;
  56}
  57static inline void mm_iommu_init(struct mm_struct *mm) { }
  58#endif
  59extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
  60
  61#ifdef CONFIG_PPC_BOOK3S_64
  62extern void radix__switch_mmu_context(struct mm_struct *prev,
  63                                      struct mm_struct *next);
  64static inline void switch_mmu_context(struct mm_struct *prev,
  65                                      struct mm_struct *next,
  66                                      struct task_struct *tsk)
  67{
  68        if (radix_enabled())
  69                return radix__switch_mmu_context(prev, next);
  70        return switch_slb(tsk, next);
  71}
  72
  73extern int hash__alloc_context_id(void);
  74extern void hash__reserve_context_id(int id);
  75extern void __destroy_context(int context_id);
  76static inline void mmu_context_init(void) { }
  77
  78static 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
  94static 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
 104#else
 105extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
 106                               struct task_struct *tsk);
 107extern unsigned long __init_new_context(void);
 108extern void __destroy_context(unsigned long context_id);
 109extern void mmu_context_init(void);
 110static inline int alloc_extended_context(struct mm_struct *mm,
 111                                         unsigned long ea)
 112{
 113        /* non book3s_64 should never find this called */
 114        WARN_ON(1);
 115        return -ENOMEM;
 116}
 117
 118static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
 119{
 120        return false;
 121}
 122#endif
 123
 124extern void switch_cop(struct mm_struct *next);
 125extern int use_cop(unsigned long acop, struct mm_struct *mm);
 126extern void drop_cop(unsigned long acop, struct mm_struct *mm);
 127
 128#ifdef CONFIG_PPC_BOOK3S_64
 129static inline void inc_mm_active_cpus(struct mm_struct *mm)
 130{
 131        atomic_inc(&mm->context.active_cpus);
 132}
 133
 134static inline void dec_mm_active_cpus(struct mm_struct *mm)
 135{
 136        atomic_dec(&mm->context.active_cpus);
 137}
 138
 139static inline void mm_context_add_copro(struct mm_struct *mm)
 140{
 141        /*
 142         * If any copro is in use, increment the active CPU count
 143         * in order to force TLB invalidations to be global as to
 144         * propagate to the Nest MMU.
 145         */
 146        if (atomic_inc_return(&mm->context.copros) == 1)
 147                inc_mm_active_cpus(mm);
 148}
 149
 150static inline void mm_context_remove_copro(struct mm_struct *mm)
 151{
 152        int c;
 153
 154        /*
 155         * When removing the last copro, we need to broadcast a global
 156         * flush of the full mm, as the next TLBI may be local and the
 157         * nMMU and/or PSL need to be cleaned up.
 158         *
 159         * Both the 'copros' and 'active_cpus' counts are looked at in
 160         * flush_all_mm() to determine the scope (local/global) of the
 161         * TLBIs, so we need to flush first before decrementing
 162         * 'copros'. If this API is used by several callers for the
 163         * same context, it can lead to over-flushing. It's hopefully
 164         * not common enough to be a problem.
 165         *
 166         * Skip on hash, as we don't know how to do the proper flush
 167         * for the time being. Invalidations will remain global if
 168         * used on hash. Note that we can't drop 'copros' either, as
 169         * it could make some invalidations local with no flush
 170         * in-between.
 171         */
 172        if (radix_enabled()) {
 173                flush_all_mm(mm);
 174
 175                c = atomic_dec_if_positive(&mm->context.copros);
 176                /* Detect imbalance between add and remove */
 177                WARN_ON(c < 0);
 178
 179                if (c == 0)
 180                        dec_mm_active_cpus(mm);
 181        }
 182}
 183
 184/*
 185 * vas_windows counter shows number of open windows in the mm
 186 * context. During context switch, use this counter to clear the
 187 * foreign real address mapping (CP_ABORT) for the thread / process
 188 * that intend to use COPY/PASTE. When a process closes all windows,
 189 * disable CP_ABORT which is expensive to run.
 190 *
 191 * For user context, register a copro so that TLBIs are seen by the
 192 * nest MMU. mm_context_add/remove_vas_window() are used only for user
 193 * space windows.
 194 */
 195static inline void mm_context_add_vas_window(struct mm_struct *mm)
 196{
 197        atomic_inc(&mm->context.vas_windows);
 198        mm_context_add_copro(mm);
 199}
 200
 201static inline void mm_context_remove_vas_window(struct mm_struct *mm)
 202{
 203        int v;
 204
 205        mm_context_remove_copro(mm);
 206        v = atomic_dec_if_positive(&mm->context.vas_windows);
 207
 208        /* Detect imbalance between add and remove */
 209        WARN_ON(v < 0);
 210}
 211#else
 212static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
 213static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
 214static inline void mm_context_add_copro(struct mm_struct *mm) { }
 215static inline void mm_context_remove_copro(struct mm_struct *mm) { }
 216#endif
 217
 218#if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
 219void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid,
 220                             unsigned long type, unsigned long pg_sizes,
 221                             unsigned long start, unsigned long end);
 222#else
 223static inline void do_h_rpt_invalidate_prt(unsigned long pid,
 224                                           unsigned long lpid,
 225                                           unsigned long type,
 226                                           unsigned long pg_sizes,
 227                                           unsigned long start,
 228                                           unsigned long end) { }
 229#endif
 230
 231extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
 232                               struct task_struct *tsk);
 233
 234static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 235                             struct task_struct *tsk)
 236{
 237        unsigned long flags;
 238
 239        local_irq_save(flags);
 240        switch_mm_irqs_off(prev, next, tsk);
 241        local_irq_restore(flags);
 242}
 243#define switch_mm_irqs_off switch_mm_irqs_off
 244
 245/*
 246 * After we have set current->mm to a new value, this activates
 247 * the context for the new mm so we see the new mappings.
 248 */
 249#define activate_mm activate_mm
 250static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
 251{
 252        switch_mm_irqs_off(prev, next, current);
 253}
 254
 255/* We don't currently use enter_lazy_tlb() for anything */
 256#ifdef CONFIG_PPC_BOOK3E_64
 257#define enter_lazy_tlb enter_lazy_tlb
 258static inline void enter_lazy_tlb(struct mm_struct *mm,
 259                                  struct task_struct *tsk)
 260{
 261        /* 64-bit Book3E keeps track of current PGD in the PACA */
 262        get_paca()->pgd = NULL;
 263}
 264#endif
 265
 266extern void arch_exit_mmap(struct mm_struct *mm);
 267
 268static inline void arch_unmap(struct mm_struct *mm,
 269                              unsigned long start, unsigned long end)
 270{
 271        unsigned long vdso_base = (unsigned long)mm->context.vdso;
 272
 273        if (start <= vdso_base && vdso_base < end)
 274                mm->context.vdso = NULL;
 275}
 276
 277#ifdef CONFIG_PPC_MEM_KEYS
 278bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
 279                               bool execute, bool foreign);
 280void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm);
 281#else /* CONFIG_PPC_MEM_KEYS */
 282static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
 283                bool write, bool execute, bool foreign)
 284{
 285        /* by default, allow everything */
 286        return true;
 287}
 288
 289#define pkey_mm_init(mm)
 290#define arch_dup_pkeys(oldmm, mm)
 291
 292static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags)
 293{
 294        return 0x0UL;
 295}
 296
 297#endif /* CONFIG_PPC_MEM_KEYS */
 298
 299static inline int arch_dup_mmap(struct mm_struct *oldmm,
 300                                struct mm_struct *mm)
 301{
 302        arch_dup_pkeys(oldmm, mm);
 303        return 0;
 304}
 305
 306#include <asm-generic/mmu_context.h>
 307
 308#endif /* __KERNEL__ */
 309#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
 310