~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/include/asm/nohash/32/pgalloc.h

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_POWERPC_PGALLOC_32_H
  3 #define _ASM_POWERPC_PGALLOC_32_H
  4 
  5 #include <linux/threads.h>
  6 #include <linux/slab.h>
  7 
  8 /*
  9  * Functions that deal with pagetables that could be at any level of
 10  * the table need to be passed an "index_size" so they know how to
 11  * handle allocation.  For PTE pages (which are linked to a struct
 12  * page for now, and drawn from the main get_free_pages() pool), the
 13  * allocation size will be (2^index_size * sizeof(pointer)) and
 14  * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
 15  *
 16  * The maximum index size needs to be big enough to allow any
 17  * pagetable sizes we need, but small enough to fit in the low bits of
 18  * any page table pointer.  In other words all pagetables, even tiny
 19  * ones, must be aligned to allow at least enough low 0 bits to
 20  * contain this value.  This value is also used as a mask, so it must
 21  * be one less than a power of two.
 22  */
 23 #define MAX_PGTABLE_INDEX_SIZE  0xf
 24 
 25 extern void __bad_pte(pmd_t *pmd);
 26 
 27 extern struct kmem_cache *pgtable_cache[];
 28 #define PGT_CACHE(shift) ({                             \
 29                         BUG_ON(!(shift));               \
 30                         pgtable_cache[(shift) - 1];     \
 31                 })
 32 
 33 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 34 {
 35         return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
 36                         pgtable_gfp_flags(mm, GFP_KERNEL));
 37 }
 38 
 39 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 40 {
 41         kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
 42 }
 43 
 44 /*
 45  * We don't have any real pmd's, and this code never triggers because
 46  * the pgd will always be present..
 47  */
 48 /* #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); }) */
 49 #define pmd_free(mm, x)                 do { } while (0)
 50 #define __pmd_free_tlb(tlb,x,a)         do { } while (0)
 51 /* #define pgd_populate(mm, pmd, pte)      BUG() */
 52 
 53 #ifndef CONFIG_BOOKE
 54 
 55 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
 56                                        pte_t *pte)
 57 {
 58         *pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
 59 }
 60 
 61 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
 62                                 pgtable_t pte_page)
 63 {
 64         *pmdp = __pmd((page_to_pfn(pte_page) << PAGE_SHIFT) | _PMD_USER |
 65                       _PMD_PRESENT);
 66 }
 67 
 68 #define pmd_pgtable(pmd) pmd_page(pmd)
 69 #else
 70 
 71 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
 72                                        pte_t *pte)
 73 {
 74         *pmdp = __pmd((unsigned long)pte | _PMD_PRESENT);
 75 }
 76 
 77 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
 78                                 pgtable_t pte_page)
 79 {
 80         *pmdp = __pmd((unsigned long)lowmem_page_address(pte_page) | _PMD_PRESENT);
 81 }
 82 
 83 #define pmd_pgtable(pmd) pmd_page(pmd)
 84 #endif
 85 
 86 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
 87 extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
 88 
 89 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 90 {
 91         free_page((unsigned long)pte);
 92 }
 93 
 94 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 95 {
 96         pgtable_page_dtor(ptepage);
 97         __free_page(ptepage);
 98 }
 99 
100 static inline void pgtable_free(void *table, unsigned index_size)
101 {
102         if (!index_size) {
103                 free_page((unsigned long)table);
104         } else {
105                 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
106                 kmem_cache_free(PGT_CACHE(index_size), table);
107         }
108 }
109 
110 #define check_pgt_cache()       do { } while (0)
111 
112 #ifdef CONFIG_SMP
113 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
114                                     void *table, int shift)
115 {
116         unsigned long pgf = (unsigned long)table;
117         BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
118         pgf |= shift;
119         tlb_remove_table(tlb, (void *)pgf);
120 }
121 
122 static inline void __tlb_remove_table(void *_table)
123 {
124         void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
125         unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
126 
127         pgtable_free(table, shift);
128 }
129 #else
130 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
131                                     void *table, int shift)
132 {
133         pgtable_free(table, shift);
134 }
135 #endif
136 
137 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
138                                   unsigned long address)
139 {
140         tlb_flush_pgtable(tlb, address);
141         pgtable_page_dtor(table);
142         pgtable_free_tlb(tlb, page_address(table), 0);
143 }
144 #endif /* _ASM_POWERPC_PGALLOC_32_H */
145 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp