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 8static 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 */ 15static 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 23pte_t *pte_fragment_alloc(struct mm_struct *mm, int kernel); 24 25static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) 26{ 27 return (pte_t *)pte_fragment_alloc(mm, 1); 28} 29 30static inline pgtable_t pte_alloc_one(struct mm_struct *mm) 31{ 32 return (pgtable_t)pte_fragment_alloc(mm, 0); 33} 34 35void pte_frag_destroy(void *pte_frag); 36void pte_fragment_free(unsigned long *table, int kernel); 37 38static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 39{ 40 pte_fragment_free((unsigned long *)pte, 1); 41} 42 43static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 44{ 45 pte_fragment_free((unsigned long *)ptepage, 0); 46} 47 48/* arch use pte_free_defer() implementation in arch/powerpc/mm/pgtable-frag.c */ 49#define pte_free_defer pte_free_defer 50void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable); 51 52/* 53 * Functions that deal with pagetables that could be at any level of 54 * the table need to be passed an "index_size" so they know how to 55 * handle allocation. For PTE pages, the allocation size will be 56 * (2^index_size * sizeof(pointer)) and allocations are drawn from 57 * the kmem_cache in PGT_CACHE(index_size). 58 * 59 * The maximum index size needs to be big enough to allow any 60 * pagetable sizes we need, but small enough to fit in the low bits of 61 * any page table pointer. In other words all pagetables, even tiny 62 * ones, must be aligned to allow at least enough low 0 bits to 63 * contain this value. This value is also used as a mask, so it must 64 * be one less than a power of two. 65 */ 66#define MAX_PGTABLE_INDEX_SIZE 0xf 67 68extern struct kmem_cache *pgtable_cache[]; 69#define PGT_CACHE(shift) pgtable_cache[shift] 70 71#ifdef CONFIG_PPC_BOOK3S 72#include <asm/book3s/pgalloc.h> 73#else 74#include <asm/nohash/pgalloc.h> 75#endif 76 77#endif /* _ASM_POWERPC_PGALLOC_H */ 78