1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
3 #define _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
5 #include <asm-generic/pgtable-nop4d.h>
8 #include <linux/mmdebug.h>
13 * Common bits between hash and Radix page table
15 #define _PAGE_BIT_SWAP_TYPE 0
17 #define _PAGE_EXEC 0x00001 /* execute permission */
18 #define _PAGE_WRITE 0x00002 /* write access allowed */
19 #define _PAGE_READ 0x00004 /* read access allowed */
20 #define _PAGE_RW (_PAGE_READ | _PAGE_WRITE)
21 #define _PAGE_RWX (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
22 #define _PAGE_PRIVILEGED 0x00008 /* kernel access only */
23 #define _PAGE_SAO 0x00010 /* Strong access order */
24 #define _PAGE_NON_IDEMPOTENT 0x00020 /* non idempotent memory */
25 #define _PAGE_TOLERANT 0x00030 /* tolerant memory, cache inhibited */
26 #define _PAGE_DIRTY 0x00080 /* C: page changed */
27 #define _PAGE_ACCESSED 0x00100 /* R: page referenced */
31 #define _RPAGE_SW0 0x2000000000000000UL
32 #define _RPAGE_SW1 0x00800
33 #define _RPAGE_SW2 0x00400
34 #define _RPAGE_SW3 0x00200
35 #define _RPAGE_RSV1 0x00040UL
37 #define _RPAGE_PKEY_BIT4 0x1000000000000000UL
38 #define _RPAGE_PKEY_BIT3 0x0800000000000000UL
39 #define _RPAGE_PKEY_BIT2 0x0400000000000000UL
40 #define _RPAGE_PKEY_BIT1 0x0200000000000000UL
41 #define _RPAGE_PKEY_BIT0 0x0100000000000000UL
43 #define _PAGE_PTE 0x4000000000000000UL /* distinguishes PTEs from pointers */
44 #define _PAGE_PRESENT 0x8000000000000000UL /* pte contains a translation */
46 * We need to mark a pmd pte invalid while splitting. We can do that by clearing
47 * the _PAGE_PRESENT bit. But then that will be taken as a swap pte. In order to
48 * differentiate between two use a SW field when invalidating.
50 * We do that temporary invalidate for regular pte entry in ptep_set_access_flags
52 * This is used only when _PAGE_PRESENT is cleared.
54 #define _PAGE_INVALID _RPAGE_SW0
57 * Top and bottom bits of RPN which can be used by hash
58 * translation mode, because we expect them to be zero
61 #define _RPAGE_RPN0 0x01000
62 #define _RPAGE_RPN1 0x02000
63 #define _RPAGE_RPN43 0x0080000000000000UL
64 #define _RPAGE_RPN42 0x0040000000000000UL
65 #define _RPAGE_RPN41 0x0020000000000000UL
67 /* Max physical address bit as per radix table */
68 #define _RPAGE_PA_MAX 56
71 * Max physical address bit we will use for now.
73 * This is mostly a hardware limitation and for now Power9 has
76 * This is different from the number of physical bit required to address
77 * the last byte of memory. That is defined by MAX_PHYSMEM_BITS.
78 * MAX_PHYSMEM_BITS is a linux limitation imposed by the maximum
79 * number of sections we can support (SECTIONS_SHIFT).
81 * This is different from Radix page table limitation above and
82 * should always be less than that. The limit is done such that
83 * we can overload the bits between _RPAGE_PA_MAX and _PAGE_PA_MAX
84 * for hash linux page table specific bits.
86 * In order to be compatible with future hardware generations we keep
87 * some offsets and limit this for now to 53
89 #define _PAGE_PA_MAX 53
91 #define _PAGE_SOFT_DIRTY _RPAGE_SW3 /* software: software dirty tracking */
92 #define _PAGE_SPECIAL _RPAGE_SW2 /* software: special page */
93 #define _PAGE_DEVMAP _RPAGE_SW1 /* software: ZONE_DEVICE page */
96 * Drivers request for cache inhibited pte mapping using _PAGE_NO_CACHE
97 * Instead of fixing all of them, add an alternate define which
98 * maps CI pte mapping.
100 #define _PAGE_NO_CACHE _PAGE_TOLERANT
102 * We support _RPAGE_PA_MAX bit real address in pte. On the linux side
103 * we are limited by _PAGE_PA_MAX. Clear everything above _PAGE_PA_MAX
104 * and every thing below PAGE_SHIFT;
106 #define PTE_RPN_MASK (((1UL << _PAGE_PA_MAX) - 1) & (PAGE_MASK))
108 * set of bits not changed in pmd_modify. Even though we have hash specific bits
109 * in here, on radix we expect them to be zero.
111 #define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
112 _PAGE_ACCESSED | H_PAGE_THP_HUGE | _PAGE_PTE | \
113 _PAGE_SOFT_DIRTY | _PAGE_DEVMAP)
115 * user access blocked by key
117 #define _PAGE_KERNEL_RW (_PAGE_PRIVILEGED | _PAGE_RW | _PAGE_DIRTY)
118 #define _PAGE_KERNEL_RO (_PAGE_PRIVILEGED | _PAGE_READ)
119 #define _PAGE_KERNEL_RWX (_PAGE_PRIVILEGED | _PAGE_DIRTY | \
120 _PAGE_RW | _PAGE_EXEC)
122 * _PAGE_CHG_MASK masks of bits that are to be preserved across
125 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
126 _PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \
127 _PAGE_SOFT_DIRTY | _PAGE_DEVMAP)
130 * We define 2 sets of base prot bits, one for basic pages (ie,
131 * cacheable kernel and user pages) and one for non cacheable
132 * pages. We always set _PAGE_COHERENT when SMP is enabled or
133 * the processor might need it for DMA coherency.
135 #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED)
136 #define _PAGE_BASE (_PAGE_BASE_NC)
138 /* Permission masks used to generate the __P and __S table,
140 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
142 * Write permissions imply read permissions for now (we could make write-only
143 * pages on BookE but we don't bother for now). Execute permission control is
144 * possible on platforms that define _PAGE_EXEC
146 #define PAGE_NONE __pgprot(_PAGE_BASE | _PAGE_PRIVILEGED)
147 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW)
148 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_EXEC)
149 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_READ)
150 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_EXEC)
151 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_READ)
152 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_EXEC)
154 /* Permission masks used for kernel mappings */
155 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
156 #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
158 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
159 _PAGE_NON_IDEMPOTENT)
160 #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
161 #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
162 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
165 * Protection used for kernel text. We want the debuggers to be able to
166 * set breakpoints anywhere, so don't write protect the kernel text
167 * on platforms where such control is possible.
169 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) || \
170 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
171 #define PAGE_KERNEL_TEXT PAGE_KERNEL_X
173 #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
176 /* Make modules code happy. We don't set RO yet */
177 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X
178 #define PAGE_AGP (PAGE_KERNEL_NC)
184 extern unsigned long __pte_index_size;
185 extern unsigned long __pmd_index_size;
186 extern unsigned long __pud_index_size;
187 extern unsigned long __pgd_index_size;
188 extern unsigned long __pud_cache_index;
189 #define PTE_INDEX_SIZE __pte_index_size
190 #define PMD_INDEX_SIZE __pmd_index_size
191 #define PUD_INDEX_SIZE __pud_index_size
192 #define PGD_INDEX_SIZE __pgd_index_size
193 /* pmd table use page table fragments */
194 #define PMD_CACHE_INDEX 0
195 #define PUD_CACHE_INDEX __pud_cache_index
197 * Because of use of pte fragments and THP, size of page table
198 * are not always derived out of index size above.
200 extern unsigned long __pte_table_size;
201 extern unsigned long __pmd_table_size;
202 extern unsigned long __pud_table_size;
203 extern unsigned long __pgd_table_size;
204 #define PTE_TABLE_SIZE __pte_table_size
205 #define PMD_TABLE_SIZE __pmd_table_size
206 #define PUD_TABLE_SIZE __pud_table_size
207 #define PGD_TABLE_SIZE __pgd_table_size
209 extern unsigned long __pmd_val_bits;
210 extern unsigned long __pud_val_bits;
211 extern unsigned long __pgd_val_bits;
212 #define PMD_VAL_BITS __pmd_val_bits
213 #define PUD_VAL_BITS __pud_val_bits
214 #define PGD_VAL_BITS __pgd_val_bits
216 extern unsigned long __pte_frag_nr;
217 #define PTE_FRAG_NR __pte_frag_nr
218 extern unsigned long __pte_frag_size_shift;
219 #define PTE_FRAG_SIZE_SHIFT __pte_frag_size_shift
220 #define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
222 extern unsigned long __pmd_frag_nr;
223 #define PMD_FRAG_NR __pmd_frag_nr
224 extern unsigned long __pmd_frag_size_shift;
225 #define PMD_FRAG_SIZE_SHIFT __pmd_frag_size_shift
226 #define PMD_FRAG_SIZE (1UL << PMD_FRAG_SIZE_SHIFT)
228 #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
229 #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
230 #define PTRS_PER_PUD (1 << PUD_INDEX_SIZE)
231 #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
233 /* PMD_SHIFT determines what a second-level page table entry can map */
234 #define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
235 #define PMD_SIZE (1UL << PMD_SHIFT)
236 #define PMD_MASK (~(PMD_SIZE-1))
238 /* PUD_SHIFT determines what a third-level page table entry can map */
239 #define PUD_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE)
240 #define PUD_SIZE (1UL << PUD_SHIFT)
241 #define PUD_MASK (~(PUD_SIZE-1))
243 /* PGDIR_SHIFT determines what a fourth-level page table entry can map */
244 #define PGDIR_SHIFT (PUD_SHIFT + PUD_INDEX_SIZE)
245 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
246 #define PGDIR_MASK (~(PGDIR_SIZE-1))
248 /* Bits to mask out from a PMD to get to the PTE page */
249 #define PMD_MASKED_BITS 0xc0000000000000ffUL
250 /* Bits to mask out from a PUD to get to the PMD page */
251 #define PUD_MASKED_BITS 0xc0000000000000ffUL
252 /* Bits to mask out from a PGD to get to the PUD page */
253 #define P4D_MASKED_BITS 0xc0000000000000ffUL
256 * Used as an indicator for rcu callback functions
264 * Below are used with 4k page size and hugetlb
270 extern unsigned long __vmalloc_start;
271 extern unsigned long __vmalloc_end;
272 #define VMALLOC_START __vmalloc_start
273 #define VMALLOC_END __vmalloc_end
275 static inline unsigned int ioremap_max_order(void)
279 return 7 + PAGE_SHIFT; /* default from linux/vmalloc.h */
281 #define IOREMAP_MAX_ORDER ioremap_max_order()
283 extern unsigned long __kernel_virt_start;
284 extern unsigned long __kernel_io_start;
285 extern unsigned long __kernel_io_end;
286 #define KERN_VIRT_START __kernel_virt_start
287 #define KERN_IO_START __kernel_io_start
288 #define KERN_IO_END __kernel_io_end
290 extern struct page *vmemmap;
291 extern unsigned long pci_io_base;
292 #endif /* __ASSEMBLY__ */
294 #include <asm/book3s/64/hash.h>
295 #include <asm/book3s/64/radix.h>
297 #if H_MAX_PHYSMEM_BITS > R_MAX_PHYSMEM_BITS
298 #define MAX_PHYSMEM_BITS H_MAX_PHYSMEM_BITS
300 #define MAX_PHYSMEM_BITS R_MAX_PHYSMEM_BITS
304 #ifdef CONFIG_PPC_64K_PAGES
305 #include <asm/book3s/64/pgtable-64k.h>
307 #include <asm/book3s/64/pgtable-4k.h>
310 #include <asm/barrier.h>
312 * IO space itself carved into the PIO region (ISA and PHB IO space) and
315 * ISA_IO_BASE = KERN_IO_START, 64K reserved area
316 * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
317 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
319 #define FULL_IO_SIZE 0x80000000ul
320 #define ISA_IO_BASE (KERN_IO_START)
321 #define ISA_IO_END (KERN_IO_START + 0x10000ul)
322 #define PHB_IO_BASE (ISA_IO_END)
323 #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
324 #define IOREMAP_BASE (PHB_IO_END)
325 #define IOREMAP_START (ioremap_bot)
326 #define IOREMAP_END (KERN_IO_END)
328 /* Advertise special mapping type for AGP */
329 #define HAVE_PAGE_AGP
334 * This is the default implementation of various PTE accessors, it's
335 * used in all cases except Book3S with 64K pages where we have a
336 * concept of sub-pages
340 #define __real_pte(e, p, o) ((real_pte_t){(e)})
341 #define __rpte_to_pte(r) ((r).pte)
342 #define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> H_PAGE_F_GIX_SHIFT)
344 #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \
347 shift = mmu_psize_defs[psize].shift; \
349 #define pte_iterate_hashed_end() } while(0)
352 * We expect this to be called only for user addresses or kernel virtual
353 * addresses other than the linear mapping.
355 #define pte_pagesize_index(mm, addr, pte) MMU_PAGE_4K
357 #endif /* __real_pte */
359 static inline unsigned long pte_update(struct mm_struct *mm, unsigned long addr,
360 pte_t *ptep, unsigned long clr,
361 unsigned long set, int huge)
364 return radix__pte_update(mm, addr, ptep, clr, set, huge);
365 return hash__pte_update(mm, addr, ptep, clr, set, huge);
368 * For hash even if we have _PAGE_ACCESSED = 0, we do a pte_update.
369 * We currently remove entries from the hashtable regardless of whether
370 * the entry was young or dirty.
372 * We should be more intelligent about this but for the moment we override
373 * these functions and force a tlb flush unconditionally
374 * For radix: H_PAGE_HASHPTE should be zero. Hence we can use the same
375 * function for both hash and radix.
377 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
378 unsigned long addr, pte_t *ptep)
382 if ((pte_raw(*ptep) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0)
384 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
385 return (old & _PAGE_ACCESSED) != 0;
388 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
389 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
391 __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
395 * On Book3S CPUs, clearing the accessed bit without a TLB flush
396 * doesn't cause data corruption. [ It could cause incorrect
397 * page aging and the (mistaken) reclaim of hot pages, but the
398 * chance of that should be relatively low. ]
400 * So as a performance optimization don't flush the TLB when
401 * clearing the accessed bit, it will eventually be flushed by
402 * a context switch or a VM operation anyway. [ In the rare
403 * event of it not getting flushed for a long time the delay
404 * shouldn't really matter because there's no real memory
405 * pressure for swapout to react to. ]
407 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
408 #define ptep_clear_flush_young ptep_test_and_clear_young
410 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
411 #define pmdp_clear_flush_young pmdp_test_and_clear_young
413 static inline int __pte_write(pte_t pte)
415 return !!(pte_raw(pte) & cpu_to_be64(_PAGE_WRITE));
418 #ifdef CONFIG_NUMA_BALANCING
419 #define pte_savedwrite pte_savedwrite
420 static inline bool pte_savedwrite(pte_t pte)
423 * Saved write ptes are prot none ptes that doesn't have
424 * privileged bit sit. We mark prot none as one which has
425 * present and pviliged bit set and RWX cleared. To mark
426 * protnone which used to have _PAGE_WRITE set we clear
427 * the privileged bit.
429 return !(pte_raw(pte) & cpu_to_be64(_PAGE_RWX | _PAGE_PRIVILEGED));
432 #define pte_savedwrite pte_savedwrite
433 static inline bool pte_savedwrite(pte_t pte)
439 static inline int pte_write(pte_t pte)
441 return __pte_write(pte) || pte_savedwrite(pte);
444 static inline int pte_read(pte_t pte)
446 return !!(pte_raw(pte) & cpu_to_be64(_PAGE_READ));
449 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
450 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
453 if (__pte_write(*ptep))
454 pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 0);
455 else if (unlikely(pte_savedwrite(*ptep)))
456 pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 0);
459 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
460 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
461 unsigned long addr, pte_t *ptep)
464 * We should not find protnone for hugetlb, but this complete the
467 if (__pte_write(*ptep))
468 pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 1);
469 else if (unlikely(pte_savedwrite(*ptep)))
470 pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 1);
473 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
474 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
475 unsigned long addr, pte_t *ptep)
477 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
481 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
482 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
484 pte_t *ptep, int full)
486 if (full && radix_enabled()) {
488 * We know that this is a full mm pte clear and
489 * hence can be sure there is no parallel set_pte.
491 return radix__ptep_get_and_clear_full(mm, addr, ptep, full);
493 return ptep_get_and_clear(mm, addr, ptep);
497 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
500 pte_update(mm, addr, ptep, ~0UL, 0, 0);
503 static inline int pte_dirty(pte_t pte)
505 return !!(pte_raw(pte) & cpu_to_be64(_PAGE_DIRTY));
508 static inline int pte_young(pte_t pte)
510 return !!(pte_raw(pte) & cpu_to_be64(_PAGE_ACCESSED));
513 static inline int pte_special(pte_t pte)
515 return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SPECIAL));
518 static inline bool pte_exec(pte_t pte)
520 return !!(pte_raw(pte) & cpu_to_be64(_PAGE_EXEC));
524 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
525 static inline bool pte_soft_dirty(pte_t pte)
527 return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SOFT_DIRTY));
530 static inline pte_t pte_mksoft_dirty(pte_t pte)
532 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SOFT_DIRTY));
535 static inline pte_t pte_clear_soft_dirty(pte_t pte)
537 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SOFT_DIRTY));
539 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
541 #ifdef CONFIG_NUMA_BALANCING
542 static inline int pte_protnone(pte_t pte)
544 return (pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE | _PAGE_RWX)) ==
545 cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE);
548 #define pte_mk_savedwrite pte_mk_savedwrite
549 static inline pte_t pte_mk_savedwrite(pte_t pte)
552 * Used by Autonuma subsystem to preserve the write bit
553 * while marking the pte PROT_NONE. Only allow this
556 VM_BUG_ON((pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_RWX | _PAGE_PRIVILEGED)) !=
557 cpu_to_be64(_PAGE_PRESENT | _PAGE_PRIVILEGED));
558 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_PRIVILEGED));
561 #define pte_clear_savedwrite pte_clear_savedwrite
562 static inline pte_t pte_clear_savedwrite(pte_t pte)
565 * Used by KSM subsystem to make a protnone pte readonly.
567 VM_BUG_ON(!pte_protnone(pte));
568 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PRIVILEGED));
571 #define pte_clear_savedwrite pte_clear_savedwrite
572 static inline pte_t pte_clear_savedwrite(pte_t pte)
575 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_WRITE));
577 #endif /* CONFIG_NUMA_BALANCING */
579 static inline bool pte_hw_valid(pte_t pte)
581 return (pte_raw(pte) & cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE)) ==
582 cpu_to_be64(_PAGE_PRESENT | _PAGE_PTE);
585 static inline int pte_present(pte_t pte)
588 * A pte is considerent present if _PAGE_PRESENT is set.
589 * We also need to consider the pte present which is marked
590 * invalid during ptep_set_access_flags. Hence we look for _PAGE_INVALID
591 * if we find _PAGE_PRESENT cleared.
594 if (pte_hw_valid(pte))
596 return (pte_raw(pte) & cpu_to_be64(_PAGE_INVALID | _PAGE_PTE)) ==
597 cpu_to_be64(_PAGE_INVALID | _PAGE_PTE);
600 #ifdef CONFIG_PPC_MEM_KEYS
601 extern bool arch_pte_access_permitted(u64 pte, bool write, bool execute);
603 static inline bool arch_pte_access_permitted(u64 pte, bool write, bool execute)
607 #endif /* CONFIG_PPC_MEM_KEYS */
609 static inline bool pte_user(pte_t pte)
611 return !(pte_raw(pte) & cpu_to_be64(_PAGE_PRIVILEGED));
614 #define pte_access_permitted pte_access_permitted
615 static inline bool pte_access_permitted(pte_t pte, bool write)
618 * _PAGE_READ is needed for any access and will be
619 * cleared for PROT_NONE
621 if (!pte_present(pte) || !pte_user(pte) || !pte_read(pte))
624 if (write && !pte_write(pte))
627 return arch_pte_access_permitted(pte_val(pte), write, 0);
631 * Conversion functions: convert a page and protection to a page entry,
632 * and a page entry and page directory to the page they refer to.
634 * Even if PTEs can be unsigned long long, a PFN is always an unsigned
637 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
639 VM_BUG_ON(pfn >> (64 - PAGE_SHIFT));
640 VM_BUG_ON((pfn << PAGE_SHIFT) & ~PTE_RPN_MASK);
642 return __pte(((pte_basic_t)pfn << PAGE_SHIFT) | pgprot_val(pgprot) | _PAGE_PTE);
645 static inline unsigned long pte_pfn(pte_t pte)
647 return (pte_val(pte) & PTE_RPN_MASK) >> PAGE_SHIFT;
650 /* Generic modifiers for PTE bits */
651 static inline pte_t pte_wrprotect(pte_t pte)
653 if (unlikely(pte_savedwrite(pte)))
654 return pte_clear_savedwrite(pte);
655 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_WRITE));
658 static inline pte_t pte_exprotect(pte_t pte)
660 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_EXEC));
663 static inline pte_t pte_mkclean(pte_t pte)
665 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_DIRTY));
668 static inline pte_t pte_mkold(pte_t pte)
670 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_ACCESSED));
673 static inline pte_t pte_mkexec(pte_t pte)
675 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_EXEC));
678 static inline pte_t pte_mkwrite(pte_t pte)
681 * write implies read, hence set both
683 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_RW));
686 static inline pte_t pte_mkdirty(pte_t pte)
688 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_DIRTY | _PAGE_SOFT_DIRTY));
691 static inline pte_t pte_mkyoung(pte_t pte)
693 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_ACCESSED));
696 static inline pte_t pte_mkspecial(pte_t pte)
698 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SPECIAL));
701 static inline pte_t pte_mkhuge(pte_t pte)
706 static inline pte_t pte_mkdevmap(pte_t pte)
708 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SPECIAL | _PAGE_DEVMAP));
711 static inline pte_t pte_mkprivileged(pte_t pte)
713 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PRIVILEGED));
716 static inline pte_t pte_mkuser(pte_t pte)
718 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_PRIVILEGED));
722 * This is potentially called with a pmd as the argument, in which case it's not
723 * safe to check _PAGE_DEVMAP unless we also confirm that _PAGE_PTE is set.
724 * That's because the bit we use for _PAGE_DEVMAP is not reserved for software
725 * use in page directory entries (ie. non-ptes).
727 static inline int pte_devmap(pte_t pte)
729 u64 mask = cpu_to_be64(_PAGE_DEVMAP | _PAGE_PTE);
731 return (pte_raw(pte) & mask) == mask;
734 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
736 /* FIXME!! check whether this need to be a conditional */
737 return __pte_raw((pte_raw(pte) & cpu_to_be64(_PAGE_CHG_MASK)) |
738 cpu_to_be64(pgprot_val(newprot)));
741 /* Encode and de-code a swap entry */
742 #define MAX_SWAPFILES_CHECK() do { \
743 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
745 * Don't have overlapping bits with _PAGE_HPTEFLAGS \
746 * We filter HPTEFLAGS on set_pte. \
748 BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \
749 BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY); \
752 #define SWP_TYPE_BITS 5
753 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \
754 & ((1UL << SWP_TYPE_BITS) - 1))
755 #define __swp_offset(x) (((x).val & PTE_RPN_MASK) >> PAGE_SHIFT)
756 #define __swp_entry(type, offset) ((swp_entry_t) { \
757 ((type) << _PAGE_BIT_SWAP_TYPE) \
758 | (((offset) << PAGE_SHIFT) & PTE_RPN_MASK)})
760 * swp_entry_t must be independent of pte bits. We build a swp_entry_t from
761 * swap type and offset we get from swap and convert that to pte to find a
762 * matching pte in linux page table.
763 * Clear bits not found in swap entries here.
765 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) & ~_PAGE_PTE })
766 #define __swp_entry_to_pte(x) __pte((x).val | _PAGE_PTE)
767 #define __pmd_to_swp_entry(pmd) (__pte_to_swp_entry(pmd_pte(pmd)))
768 #define __swp_entry_to_pmd(x) (pte_pmd(__swp_entry_to_pte(x)))
770 #ifdef CONFIG_MEM_SOFT_DIRTY
771 #define _PAGE_SWP_SOFT_DIRTY (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE))
773 #define _PAGE_SWP_SOFT_DIRTY 0UL
774 #endif /* CONFIG_MEM_SOFT_DIRTY */
776 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
777 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
779 return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SWP_SOFT_DIRTY));
782 static inline bool pte_swp_soft_dirty(pte_t pte)
784 return !!(pte_raw(pte) & cpu_to_be64(_PAGE_SWP_SOFT_DIRTY));
787 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
789 return __pte_raw(pte_raw(pte) & cpu_to_be64(~_PAGE_SWP_SOFT_DIRTY));
791 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
793 static inline bool check_pte_access(unsigned long access, unsigned long ptev)
796 * This check for _PAGE_RWX and _PAGE_PRESENT bits
801 * This check for access to privilege space
803 if ((access & _PAGE_PRIVILEGED) != (ptev & _PAGE_PRIVILEGED))
809 * Generic functions with hash/radix callbacks
812 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
813 pte_t *ptep, pte_t entry,
814 unsigned long address,
818 return radix__ptep_set_access_flags(vma, ptep, entry,
820 return hash__ptep_set_access_flags(ptep, entry);
823 #define __HAVE_ARCH_PTE_SAME
824 static inline int pte_same(pte_t pte_a, pte_t pte_b)
827 return radix__pte_same(pte_a, pte_b);
828 return hash__pte_same(pte_a, pte_b);
831 static inline int pte_none(pte_t pte)
834 return radix__pte_none(pte);
835 return hash__pte_none(pte);
838 static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
839 pte_t *ptep, pte_t pte, int percpu)
842 VM_WARN_ON(!(pte_raw(pte) & cpu_to_be64(_PAGE_PTE)));
844 * Keep the _PAGE_PTE added till we are sure we handle _PAGE_PTE
845 * in all the callers.
847 pte = __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_PTE));
850 return radix__set_pte_at(mm, addr, ptep, pte, percpu);
851 return hash__set_pte_at(mm, addr, ptep, pte, percpu);
854 #define _PAGE_CACHE_CTL (_PAGE_SAO | _PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT)
856 #define pgprot_noncached pgprot_noncached
857 static inline pgprot_t pgprot_noncached(pgprot_t prot)
859 return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) |
860 _PAGE_NON_IDEMPOTENT);
863 #define pgprot_noncached_wc pgprot_noncached_wc
864 static inline pgprot_t pgprot_noncached_wc(pgprot_t prot)
866 return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL) |
870 #define pgprot_cached pgprot_cached
871 static inline pgprot_t pgprot_cached(pgprot_t prot)
873 return __pgprot((pgprot_val(prot) & ~_PAGE_CACHE_CTL));
876 #define pgprot_writecombine pgprot_writecombine
877 static inline pgprot_t pgprot_writecombine(pgprot_t prot)
879 return pgprot_noncached_wc(prot);
882 * check a pte mapping have cache inhibited property
884 static inline bool pte_ci(pte_t pte)
886 __be64 pte_v = pte_raw(pte);
888 if (((pte_v & cpu_to_be64(_PAGE_CACHE_CTL)) == cpu_to_be64(_PAGE_TOLERANT)) ||
889 ((pte_v & cpu_to_be64(_PAGE_CACHE_CTL)) == cpu_to_be64(_PAGE_NON_IDEMPOTENT)))
894 static inline void pmd_clear(pmd_t *pmdp)
896 if (IS_ENABLED(CONFIG_DEBUG_VM) && !radix_enabled()) {
898 * Don't use this if we can possibly have a hash page table
899 * entry mapping this.
901 WARN_ON((pmd_val(*pmdp) & (H_PAGE_HASHPTE | _PAGE_PTE)) == (H_PAGE_HASHPTE | _PAGE_PTE));
906 static inline int pmd_none(pmd_t pmd)
908 return !pmd_raw(pmd);
911 static inline int pmd_present(pmd_t pmd)
914 * A pmd is considerent present if _PAGE_PRESENT is set.
915 * We also need to consider the pmd present which is marked
916 * invalid during a split. Hence we look for _PAGE_INVALID
917 * if we find _PAGE_PRESENT cleared.
919 if (pmd_raw(pmd) & cpu_to_be64(_PAGE_PRESENT | _PAGE_INVALID))
925 static inline int pmd_is_serializing(pmd_t pmd)
928 * If the pmd is undergoing a split, the _PAGE_PRESENT bit is clear
929 * and _PAGE_INVALID is set (see pmd_present, pmdp_invalidate).
931 * This condition may also occur when flushing a pmd while flushing
932 * it (see ptep_modify_prot_start), so callers must ensure this
933 * case is fine as well.
935 if ((pmd_raw(pmd) & cpu_to_be64(_PAGE_PRESENT | _PAGE_INVALID)) ==
936 cpu_to_be64(_PAGE_INVALID))
942 static inline int pmd_bad(pmd_t pmd)
945 return radix__pmd_bad(pmd);
946 return hash__pmd_bad(pmd);
949 static inline void pud_clear(pud_t *pudp)
951 if (IS_ENABLED(CONFIG_DEBUG_VM) && !radix_enabled()) {
953 * Don't use this if we can possibly have a hash page table
954 * entry mapping this.
956 WARN_ON((pud_val(*pudp) & (H_PAGE_HASHPTE | _PAGE_PTE)) == (H_PAGE_HASHPTE | _PAGE_PTE));
961 static inline int pud_none(pud_t pud)
963 return !pud_raw(pud);
966 static inline int pud_present(pud_t pud)
968 return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PRESENT));
971 extern struct page *pud_page(pud_t pud);
972 extern struct page *pmd_page(pmd_t pmd);
973 static inline pte_t pud_pte(pud_t pud)
975 return __pte_raw(pud_raw(pud));
978 static inline pud_t pte_pud(pte_t pte)
980 return __pud_raw(pte_raw(pte));
982 #define pud_write(pud) pte_write(pud_pte(pud))
984 static inline int pud_bad(pud_t pud)
987 return radix__pud_bad(pud);
988 return hash__pud_bad(pud);
991 #define pud_access_permitted pud_access_permitted
992 static inline bool pud_access_permitted(pud_t pud, bool write)
994 return pte_access_permitted(pud_pte(pud), write);
997 #define __p4d_raw(x) ((p4d_t) { __pgd_raw(x) })
998 static inline __be64 p4d_raw(p4d_t x)
1000 return pgd_raw(x.pgd);
1003 #define p4d_write(p4d) pte_write(p4d_pte(p4d))
1005 static inline void p4d_clear(p4d_t *p4dp)
1010 static inline int p4d_none(p4d_t p4d)
1012 return !p4d_raw(p4d);
1015 static inline int p4d_present(p4d_t p4d)
1017 return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PRESENT));
1020 static inline pte_t p4d_pte(p4d_t p4d)
1022 return __pte_raw(p4d_raw(p4d));
1025 static inline p4d_t pte_p4d(pte_t pte)
1027 return __p4d_raw(pte_raw(pte));
1030 static inline int p4d_bad(p4d_t p4d)
1032 if (radix_enabled())
1033 return radix__p4d_bad(p4d);
1034 return hash__p4d_bad(p4d);
1037 #define p4d_access_permitted p4d_access_permitted
1038 static inline bool p4d_access_permitted(p4d_t p4d, bool write)
1040 return pte_access_permitted(p4d_pte(p4d), write);
1043 extern struct page *p4d_page(p4d_t p4d);
1045 /* Pointers in the page table tree are physical addresses */
1046 #define __pgtable_ptr_val(ptr) __pa(ptr)
1048 #define pud_page_vaddr(pud) __va(pud_val(pud) & ~PUD_MASKED_BITS)
1049 #define p4d_page_vaddr(p4d) __va(p4d_val(p4d) & ~P4D_MASKED_BITS)
1051 #define pte_ERROR(e) \
1052 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
1053 #define pmd_ERROR(e) \
1054 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
1055 #define pud_ERROR(e) \
1056 pr_err("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e))
1057 #define pgd_ERROR(e) \
1058 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
1060 static inline int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
1062 if (radix_enabled()) {
1063 #if defined(CONFIG_PPC_RADIX_MMU) && defined(DEBUG_VM)
1064 unsigned long page_size = 1 << mmu_psize_defs[mmu_io_psize].shift;
1065 WARN((page_size != PAGE_SIZE), "I/O page size != PAGE_SIZE");
1067 return radix__map_kernel_page(ea, pa, prot, PAGE_SIZE);
1069 return hash__map_kernel_page(ea, pa, prot);
1072 static inline int __meminit vmemmap_create_mapping(unsigned long start,
1073 unsigned long page_size,
1076 if (radix_enabled())
1077 return radix__vmemmap_create_mapping(start, page_size, phys);
1078 return hash__vmemmap_create_mapping(start, page_size, phys);
1081 #ifdef CONFIG_MEMORY_HOTPLUG
1082 static inline void vmemmap_remove_mapping(unsigned long start,
1083 unsigned long page_size)
1085 if (radix_enabled())
1086 return radix__vmemmap_remove_mapping(start, page_size);
1087 return hash__vmemmap_remove_mapping(start, page_size);
1091 static inline pte_t pmd_pte(pmd_t pmd)
1093 return __pte_raw(pmd_raw(pmd));
1096 static inline pmd_t pte_pmd(pte_t pte)
1098 return __pmd_raw(pte_raw(pte));
1101 static inline pte_t *pmdp_ptep(pmd_t *pmd)
1103 return (pte_t *)pmd;
1105 #define pmd_pfn(pmd) pte_pfn(pmd_pte(pmd))
1106 #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
1107 #define pmd_young(pmd) pte_young(pmd_pte(pmd))
1108 #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd)))
1109 #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd)))
1110 #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd)))
1111 #define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd)))
1112 #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd)))
1113 #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd)))
1114 #define pmd_mk_savedwrite(pmd) pte_pmd(pte_mk_savedwrite(pmd_pte(pmd)))
1115 #define pmd_clear_savedwrite(pmd) pte_pmd(pte_clear_savedwrite(pmd_pte(pmd)))
1117 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1118 #define pmd_soft_dirty(pmd) pte_soft_dirty(pmd_pte(pmd))
1119 #define pmd_mksoft_dirty(pmd) pte_pmd(pte_mksoft_dirty(pmd_pte(pmd)))
1120 #define pmd_clear_soft_dirty(pmd) pte_pmd(pte_clear_soft_dirty(pmd_pte(pmd)))
1122 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1123 #define pmd_swp_mksoft_dirty(pmd) pte_pmd(pte_swp_mksoft_dirty(pmd_pte(pmd)))
1124 #define pmd_swp_soft_dirty(pmd) pte_swp_soft_dirty(pmd_pte(pmd))
1125 #define pmd_swp_clear_soft_dirty(pmd) pte_pmd(pte_swp_clear_soft_dirty(pmd_pte(pmd)))
1127 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
1129 #ifdef CONFIG_NUMA_BALANCING
1130 static inline int pmd_protnone(pmd_t pmd)
1132 return pte_protnone(pmd_pte(pmd));
1134 #endif /* CONFIG_NUMA_BALANCING */
1136 #define pmd_write(pmd) pte_write(pmd_pte(pmd))
1137 #define __pmd_write(pmd) __pte_write(pmd_pte(pmd))
1138 #define pmd_savedwrite(pmd) pte_savedwrite(pmd_pte(pmd))
1140 #define pmd_access_permitted pmd_access_permitted
1141 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1144 * pmdp_invalidate sets this combination (which is not caught by
1145 * !pte_present() check in pte_access_permitted), to prevent
1146 * lock-free lookups, as part of the serialize_against_pte_lookup()
1149 * This also catches the case where the PTE's hardware PRESENT bit is
1150 * cleared while TLB is flushed, which is suboptimal but should not
1153 if (pmd_is_serializing(pmd))
1156 return pte_access_permitted(pmd_pte(pmd), write);
1159 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1160 extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot);
1161 extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot);
1162 extern pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot);
1163 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1164 pmd_t *pmdp, pmd_t pmd);
1165 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1166 unsigned long addr, pmd_t *pmd)
1170 extern int hash__has_transparent_hugepage(void);
1171 static inline int has_transparent_hugepage(void)
1173 if (radix_enabled())
1174 return radix__has_transparent_hugepage();
1175 return hash__has_transparent_hugepage();
1177 #define has_transparent_hugepage has_transparent_hugepage
1179 static inline unsigned long
1180 pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp,
1181 unsigned long clr, unsigned long set)
1183 if (radix_enabled())
1184 return radix__pmd_hugepage_update(mm, addr, pmdp, clr, set);
1185 return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set);
1189 * returns true for pmd migration entries, THP, devmap, hugetlb
1190 * But compile time dependent on THP config
1192 static inline int pmd_large(pmd_t pmd)
1194 return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
1198 * For radix we should always find H_PAGE_HASHPTE zero. Hence
1199 * the below will work for radix too
1201 static inline int __pmdp_test_and_clear_young(struct mm_struct *mm,
1202 unsigned long addr, pmd_t *pmdp)
1206 if ((pmd_raw(*pmdp) & cpu_to_be64(_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0)
1208 old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0);
1209 return ((old & _PAGE_ACCESSED) != 0);
1212 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1213 static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr,
1216 if (__pmd_write((*pmdp)))
1217 pmd_hugepage_update(mm, addr, pmdp, _PAGE_WRITE, 0);
1218 else if (unlikely(pmd_savedwrite(*pmdp)))
1219 pmd_hugepage_update(mm, addr, pmdp, 0, _PAGE_PRIVILEGED);
1223 * Only returns true for a THP. False for pmd migration entry.
1224 * We also need to return true when we come across a pte that
1225 * in between a thp split. While splitting THP, we mark the pmd
1226 * invalid (pmdp_invalidate()) before we set it with pte page
1227 * address. A pmd_trans_huge() check against a pmd entry during that time
1228 * should return true.
1229 * We should not call this on a hugetlb entry. We should check for HugeTLB
1230 * entry using vma->vm_flags
1231 * The page table walk rule is explained in Documentation/vm/transhuge.rst
1233 static inline int pmd_trans_huge(pmd_t pmd)
1235 if (!pmd_present(pmd))
1238 if (radix_enabled())
1239 return radix__pmd_trans_huge(pmd);
1240 return hash__pmd_trans_huge(pmd);
1243 #define __HAVE_ARCH_PMD_SAME
1244 static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
1246 if (radix_enabled())
1247 return radix__pmd_same(pmd_a, pmd_b);
1248 return hash__pmd_same(pmd_a, pmd_b);
1251 static inline pmd_t __pmd_mkhuge(pmd_t pmd)
1253 if (radix_enabled())
1254 return radix__pmd_mkhuge(pmd);
1255 return hash__pmd_mkhuge(pmd);
1259 * pfn_pmd return a pmd_t that can be used as pmd pte entry.
1261 static inline pmd_t pmd_mkhuge(pmd_t pmd)
1263 #ifdef CONFIG_DEBUG_VM
1264 if (radix_enabled())
1265 WARN_ON((pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE)) == 0);
1267 WARN_ON((pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE | H_PAGE_THP_HUGE)) !=
1268 cpu_to_be64(_PAGE_PTE | H_PAGE_THP_HUGE));
1273 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1274 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1275 unsigned long address, pmd_t *pmdp,
1276 pmd_t entry, int dirty);
1278 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1279 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1280 unsigned long address, pmd_t *pmdp);
1282 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1283 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
1284 unsigned long addr, pmd_t *pmdp)
1286 if (radix_enabled())
1287 return radix__pmdp_huge_get_and_clear(mm, addr, pmdp);
1288 return hash__pmdp_huge_get_and_clear(mm, addr, pmdp);
1291 static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
1292 unsigned long address, pmd_t *pmdp)
1294 if (radix_enabled())
1295 return radix__pmdp_collapse_flush(vma, address, pmdp);
1296 return hash__pmdp_collapse_flush(vma, address, pmdp);
1298 #define pmdp_collapse_flush pmdp_collapse_flush
1300 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
1301 pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma,
1303 pmd_t *pmdp, int full);
1305 #define __HAVE_ARCH_PGTABLE_DEPOSIT
1306 static inline void pgtable_trans_huge_deposit(struct mm_struct *mm,
1307 pmd_t *pmdp, pgtable_t pgtable)
1309 if (radix_enabled())
1310 return radix__pgtable_trans_huge_deposit(mm, pmdp, pgtable);
1311 return hash__pgtable_trans_huge_deposit(mm, pmdp, pgtable);
1314 #define __HAVE_ARCH_PGTABLE_WITHDRAW
1315 static inline pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm,
1318 if (radix_enabled())
1319 return radix__pgtable_trans_huge_withdraw(mm, pmdp);
1320 return hash__pgtable_trans_huge_withdraw(mm, pmdp);
1323 #define __HAVE_ARCH_PMDP_INVALIDATE
1324 extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
1327 #define pmd_move_must_withdraw pmd_move_must_withdraw
1329 extern int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl,
1330 struct spinlock *old_pmd_ptl,
1331 struct vm_area_struct *vma);
1333 * Hash translation mode use the deposited table to store hash pte
1336 #define arch_needs_pgtable_deposit arch_needs_pgtable_deposit
1337 static inline bool arch_needs_pgtable_deposit(void)
1339 if (radix_enabled())
1343 extern void serialize_against_pte_lookup(struct mm_struct *mm);
1346 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
1348 if (radix_enabled())
1349 return radix__pmd_mkdevmap(pmd);
1350 return hash__pmd_mkdevmap(pmd);
1353 static inline int pmd_devmap(pmd_t pmd)
1355 return pte_devmap(pmd_pte(pmd));
1358 static inline int pud_devmap(pud_t pud)
1363 static inline int pgd_devmap(pgd_t pgd)
1367 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1369 static inline int pud_pfn(pud_t pud)
1372 * Currently all calls to pud_pfn() are gated around a pud_devmap()
1373 * check so this should never be used. If it grows another user we
1374 * want to know about it.
1379 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
1380 pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *);
1381 void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long,
1382 pte_t *, pte_t, pte_t);
1385 * Returns true for a R -> RW upgrade of pte
1387 static inline bool is_pte_rw_upgrade(unsigned long old_val, unsigned long new_val)
1389 if (!(old_val & _PAGE_READ))
1392 if ((!(old_val & _PAGE_WRITE)) && (new_val & _PAGE_WRITE))
1399 * Like pmd_huge() and pmd_large(), but works regardless of config options
1401 #define pmd_is_leaf pmd_is_leaf
1402 #define pmd_leaf pmd_is_leaf
1403 static inline bool pmd_is_leaf(pmd_t pmd)
1405 return !!(pmd_raw(pmd) & cpu_to_be64(_PAGE_PTE));
1408 #define pud_is_leaf pud_is_leaf
1409 #define pud_leaf pud_is_leaf
1410 static inline bool pud_is_leaf(pud_t pud)
1412 return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
1415 #define p4d_is_leaf p4d_is_leaf
1416 #define p4d_leaf p4d_is_leaf
1417 static inline bool p4d_is_leaf(p4d_t p4d)
1419 return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PTE));
1422 #endif /* __ASSEMBLY__ */
1423 #endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */