arch/powerpc/include/asm/book3s/64/pgtable.h

   1 #ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
   2 #define _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
   3 /*
   4  * This file contains the functions and defines necessary to modify and use
   5  * the ppc64 hashed page table.
   6  */
   7
   8 #include <asm/book3s/64/hash.h>
   9 #include <asm/barrier.h>
  10
  11 /*
  12  * The second half of the kernel virtual space is used for IO mappings,
  13  * it's itself carved into the PIO region (ISA and PHB IO space) and
  14  * the ioremap space
  15  *
  16  *  ISA_IO_BASE = KERN_IO_START, 64K reserved area
  17  *  PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
  18  * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
  19  */
  20 #define KERN_IO_START   (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
  21 #define FULL_IO_SIZE    0x80000000ul
  22 #define  ISA_IO_BASE    (KERN_IO_START)
  23 #define  ISA_IO_END     (KERN_IO_START + 0x10000ul)
  24 #define  PHB_IO_BASE    (ISA_IO_END)
  25 #define  PHB_IO_END     (KERN_IO_START + FULL_IO_SIZE)
  26 #define IOREMAP_BASE    (PHB_IO_END)
  27 #define IOREMAP_END     (KERN_VIRT_START + KERN_VIRT_SIZE)
  28
  29 #define vmemmap                 ((struct page *)VMEMMAP_BASE)
  30
  31 /* Advertise special mapping type for AGP */
  32 #define HAVE_PAGE_AGP
  33
  34 /* Advertise support for _PAGE_SPECIAL */
  35 #define __HAVE_ARCH_PTE_SPECIAL
  36
  37 #ifndef __ASSEMBLY__
  38
  39 /*
  40  * This is the default implementation of various PTE accessors, it's
  41  * used in all cases except Book3S with 64K pages where we have a
  42  * concept of sub-pages
  43  */
  44 #ifndef __real_pte
  45
  46 #ifdef CONFIG_STRICT_MM_TYPECHECKS
  47 #define __real_pte(e,p)         ((real_pte_t){(e)})
  48 #define __rpte_to_pte(r)        ((r).pte)
  49 #else
  50 #define __real_pte(e,p)         (e)
  51 #define __rpte_to_pte(r)        (__pte(r))
  52 #endif
  53 #define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >>_PAGE_F_GIX_SHIFT)
  54
  55 #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift)       \
  56         do {                                                             \
  57                 index = 0;                                               \
  58                 shift = mmu_psize_defs[psize].shift;                     \
  59
  60 #define pte_iterate_hashed_end() } while(0)
  61
  62 /*
  63  * We expect this to be called only for user addresses or kernel virtual
  64  * addresses other than the linear mapping.
  65  */
  66 #define pte_pagesize_index(mm, addr, pte)       MMU_PAGE_4K
  67
  68 #endif /* __real_pte */
  69
  70 static inline void pmd_set(pmd_t *pmdp, unsigned long val)
  71 {
  72         *pmdp = __pmd(val);
  73 }
  74
  75 static inline void pmd_clear(pmd_t *pmdp)
  76 {
  77         *pmdp = __pmd(0);
  78 }
  79
  80 #define pmd_none(pmd)           (!pmd_val(pmd))
  81 #define pmd_present(pmd)        (!pmd_none(pmd))
  82
  83 static inline void pud_set(pud_t *pudp, unsigned long val)
  84 {
  85         *pudp = __pud(val);
  86 }
  87
  88 static inline void pud_clear(pud_t *pudp)
  89 {
  90         *pudp = __pud(0);
  91 }
  92
  93 #define pud_none(pud)           (!pud_val(pud))
  94 #define pud_present(pud)        (pud_val(pud) != 0)
  95
  96 extern struct page *pud_page(pud_t pud);
  97 extern struct page *pmd_page(pmd_t pmd);
  98 static inline pte_t pud_pte(pud_t pud)
  99 {
 100         return __pte(pud_val(pud));
 101 }
 102
 103 static inline pud_t pte_pud(pte_t pte)
 104 {
 105         return __pud(pte_val(pte));
 106 }
 107 #define pud_write(pud)          pte_write(pud_pte(pud))
 108 #define pgd_write(pgd)          pte_write(pgd_pte(pgd))
 109 static inline void pgd_set(pgd_t *pgdp, unsigned long val)
 110 {
 111         *pgdp = __pgd(val);
 112 }
 113
 114 /*
 115  * Find an entry in a page-table-directory.  We combine the address region
 116  * (the high order N bits) and the pgd portion of the address.
 117  */
 118
 119 #define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
 120
 121 #define pmd_offset(pudp,addr) \
 122         (((pmd_t *) pud_page_vaddr(*(pudp))) + pmd_index(addr))
 123
 124 #define pte_offset_kernel(dir,addr) \
 125         (((pte_t *) pmd_page_vaddr(*(dir))) + pte_index(addr))
 126
 127 #define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 128 #define pte_unmap(pte)                  do { } while(0)
 129
 130 /* to find an entry in a kernel page-table-directory */
 131 /* This now only contains the vmalloc pages */
 132 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 133
 134 #define pte_ERROR(e) \
 135         pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
 136 #define pmd_ERROR(e) \
 137         pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
 138 #define pgd_ERROR(e) \
 139         pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
 140
 141 /* Encode and de-code a swap entry */
 142 #define MAX_SWAPFILES_CHECK() do { \
 143         BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
 144         /*                                                      \
 145          * Don't have overlapping bits with _PAGE_HPTEFLAGS     \
 146          * We filter HPTEFLAGS on set_pte.                      \
 147          */                                                     \
 148         BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \
 149         BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY);   \
 150         } while (0)
 151 /*
 152  * on pte we don't need handle RADIX_TREE_EXCEPTIONAL_SHIFT;
 153  */
 154 #define SWP_TYPE_BITS 5
 155 #define __swp_type(x)           (((x).val >> _PAGE_BIT_SWAP_TYPE) \
 156                                 & ((1UL << SWP_TYPE_BITS) - 1))
 157 #define __swp_offset(x)         ((x).val >> PTE_RPN_SHIFT)
 158 #define __swp_entry(type, offset)       ((swp_entry_t) { \
 159                                         ((type) << _PAGE_BIT_SWAP_TYPE) \
 160                                         | ((offset) << PTE_RPN_SHIFT) })
 161 /*
 162  * swp_entry_t must be independent of pte bits. We build a swp_entry_t from
 163  * swap type and offset we get from swap and convert that to pte to find a
 164  * matching pte in linux page table.
 165  * Clear bits not found in swap entries here.
 166  */
 167 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) & ~_PAGE_PTE })
 168 #define __swp_entry_to_pte(x)   __pte((x).val | _PAGE_PTE)
 169
 170 #ifdef CONFIG_MEM_SOFT_DIRTY
 171 #define _PAGE_SWP_SOFT_DIRTY   (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
 172 #else
 173 #define _PAGE_SWP_SOFT_DIRTY    0UL
 174 #endif /* CONFIG_MEM_SOFT_DIRTY */
 175
 176 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 177 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
 178 {
 179         return __pte(pte_val(pte) | _PAGE_SWP_SOFT_DIRTY);
 180 }
 181 static inline bool pte_swp_soft_dirty(pte_t pte)
 182 {
 183         return !!(pte_val(pte) & _PAGE_SWP_SOFT_DIRTY);
 184 }
 185 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
 186 {
 187         return __pte(pte_val(pte) & ~_PAGE_SWP_SOFT_DIRTY);
 188 }
 189 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
 190
 191 void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
 192 void pgtable_cache_init(void);
 193
 194 struct page *realmode_pfn_to_page(unsigned long pfn);
 195
 196 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 197 extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot);
 198 extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot);
 199 extern pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot);
 200 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 201                        pmd_t *pmdp, pmd_t pmd);
 202 extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
 203                                  pmd_t *pmd);
 204 extern int has_transparent_hugepage(void);
 205 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 206
 207
 208 static inline pte_t pmd_pte(pmd_t pmd)
 209 {
 210         return __pte(pmd_val(pmd));
 211 }
 212
 213 static inline pmd_t pte_pmd(pte_t pte)
 214 {
 215         return __pmd(pte_val(pte));
 216 }
 217
 218 static inline pte_t *pmdp_ptep(pmd_t *pmd)
 219 {
 220         return (pte_t *)pmd;
 221 }
 222
 223 #define pmd_pfn(pmd)            pte_pfn(pmd_pte(pmd))
 224 #define pmd_dirty(pmd)          pte_dirty(pmd_pte(pmd))
 225 #define pmd_young(pmd)          pte_young(pmd_pte(pmd))
 226 #define pmd_mkold(pmd)          pte_pmd(pte_mkold(pmd_pte(pmd)))
 227 #define pmd_wrprotect(pmd)      pte_pmd(pte_wrprotect(pmd_pte(pmd)))
 228 #define pmd_mkdirty(pmd)        pte_pmd(pte_mkdirty(pmd_pte(pmd)))
 229 #define pmd_mkyoung(pmd)        pte_pmd(pte_mkyoung(pmd_pte(pmd)))
 230 #define pmd_mkwrite(pmd)        pte_pmd(pte_mkwrite(pmd_pte(pmd)))
 231
 232 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 233 #define pmd_soft_dirty(pmd)    pte_soft_dirty(pmd_pte(pmd))
 234 #define pmd_mksoft_dirty(pmd)  pte_pmd(pte_mksoft_dirty(pmd_pte(pmd)))
 235 #define pmd_clear_soft_dirty(pmd) pte_pmd(pte_clear_soft_dirty(pmd_pte(pmd)))
 236 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
 237
 238 #ifdef CONFIG_NUMA_BALANCING
 239 static inline int pmd_protnone(pmd_t pmd)
 240 {
 241         return pte_protnone(pmd_pte(pmd));
 242 }
 243 #endif /* CONFIG_NUMA_BALANCING */
 244
 245 #define __HAVE_ARCH_PMD_WRITE
 246 #define pmd_write(pmd)          pte_write(pmd_pte(pmd))
 247
 248 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 249 {
 250         return __pmd(pmd_val(pmd) | (_PAGE_PTE | _PAGE_THP_HUGE));
 251 }
 252
 253 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
 254 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
 255                                  unsigned long address, pmd_t *pmdp,
 256                                  pmd_t entry, int dirty);
 257
 258 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 259 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 260                                      unsigned long address, pmd_t *pmdp);
 261 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
 262 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
 263                                   unsigned long address, pmd_t *pmdp);
 264
 265 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
 266 extern pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 267                                      unsigned long addr, pmd_t *pmdp);
 268
 269 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 270 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 271                                  unsigned long address, pmd_t *pmdp);
 272
 273 extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
 274                                  unsigned long address, pmd_t *pmdp);
 275 #define pmdp_collapse_flush pmdp_collapse_flush
 276
 277 #define __HAVE_ARCH_PGTABLE_DEPOSIT
 278 extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
 279                                        pgtable_t pgtable);
 280 #define __HAVE_ARCH_PGTABLE_WITHDRAW
 281 extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
 282
 283 #define __HAVE_ARCH_PMDP_INVALIDATE
 284 extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
 285                             pmd_t *pmdp);
 286
 287 #define pmd_move_must_withdraw pmd_move_must_withdraw
 288 struct spinlock;
 289 static inline int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
 290                                          struct spinlock *old_pmd_ptl)
 291 {
 292         /*
 293          * Archs like ppc64 use pgtable to store per pmd
 294          * specific information. So when we switch the pmd,
 295          * we should also withdraw and deposit the pgtable
 296          */
 297         return true;
 298 }
 299 #endif /* __ASSEMBLY__ */
 300 #endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */