1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_PGALLOC_H 3 #define _ASM_POWERPC_PGALLOC_H 4 5 #include <linux/mm.h> 6 7 #ifndef MODULE 8 static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp) 9 { 10 if (unlikely(mm == &init_mm)) 11 return gfp; 12 return gfp | __GFP_ACCOUNT; 13 } 14 #else /* !MODULE */ 15 static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp) 16 { 17 return gfp | __GFP_ACCOUNT; 18 } 19 #endif /* MODULE */ 20 21 #define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO) 22 23 pte_t *pte_fragment_alloc(struct mm_struct *mm, int kernel); 24 25 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) 26 { 27 return (pte_t *)pte_fragment_alloc(mm, 1); 28 } 29 30 static inline pgtable_t pte_alloc_one(struct mm_struct *mm) 31 { 32 return (pgtable_t)pte_fragment_alloc(mm, 0); 33 } 34 35 void pte_frag_destroy(void *pte_frag); 36 void pte_fragment_free(unsigned long *table, int kernel); 37 38 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 39 { 40 pte_fragment_free((unsigned long *)pte, 1); 41 } 42 43 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 44 { 45 pte_fragment_free((unsigned long *)ptepage, 0); 46 } 47 48 /* 49 * Functions that deal with pagetables that could be at any level of 50 * the table need to be passed an "index_size" so they know how to 51 * handle allocation. For PTE pages, the allocation size will be 52 * (2^index_size * sizeof(pointer)) and allocations are drawn from 53 * the kmem_cache in PGT_CACHE(index_size). 54 * 55 * The maximum index size needs to be big enough to allow any 56 * pagetable sizes we need, but small enough to fit in the low bits of 57 * any page table pointer. In other words all pagetables, even tiny 58 * ones, must be aligned to allow at least enough low 0 bits to 59 * contain this value. This value is also used as a mask, so it must 60 * be one less than a power of two. 61 */ 62 #define MAX_PGTABLE_INDEX_SIZE 0xf 63 64 extern struct kmem_cache *pgtable_cache[]; 65 #define PGT_CACHE(shift) pgtable_cache[shift] 66 67 static inline void check_pgt_cache(void) { } 68 69 #ifdef CONFIG_PPC_BOOK3S 70 #include <asm/book3s/pgalloc.h> 71 #else 72 #include <asm/nohash/pgalloc.h> 73 #endif 74 75 static inline pgtable_t pmd_pgtable(pmd_t pmd) 76 { 77 return (pgtable_t)pmd_page_vaddr(pmd); 78 } 79 80 #endif /* _ASM_POWERPC_PGALLOC_H */ 81