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Diffstat (limited to '')
-rw-r--r-- | arch/powerpc/include/asm/pgalloc.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/pgalloc.h b/arch/powerpc/include/asm/pgalloc.h new file mode 100644 index 000000000..3360cad78 --- /dev/null +++ b/arch/powerpc/include/asm/pgalloc.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_PGALLOC_H +#define _ASM_POWERPC_PGALLOC_H + +#include <linux/mm.h> + +#ifndef MODULE +static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp) +{ + if (unlikely(mm == &init_mm)) + return gfp; + return gfp | __GFP_ACCOUNT; +} +#else /* !MODULE */ +static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp) +{ + return gfp | __GFP_ACCOUNT; +} +#endif /* MODULE */ + +#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO) + +pte_t *pte_fragment_alloc(struct mm_struct *mm, int kernel); + +static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) +{ + return (pte_t *)pte_fragment_alloc(mm, 1); +} + +static inline pgtable_t pte_alloc_one(struct mm_struct *mm) +{ + return (pgtable_t)pte_fragment_alloc(mm, 0); +} + +void pte_frag_destroy(void *pte_frag); +void pte_fragment_free(unsigned long *table, int kernel); + +static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) +{ + pte_fragment_free((unsigned long *)pte, 1); +} + +static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) +{ + pte_fragment_free((unsigned long *)ptepage, 0); +} + +/* + * Functions that deal with pagetables that could be at any level of + * the table need to be passed an "index_size" so they know how to + * handle allocation. For PTE pages, the allocation size will be + * (2^index_size * sizeof(pointer)) and allocations are drawn from + * the kmem_cache in PGT_CACHE(index_size). + * + * The maximum index size needs to be big enough to allow any + * pagetable sizes we need, but small enough to fit in the low bits of + * any page table pointer. In other words all pagetables, even tiny + * ones, must be aligned to allow at least enough low 0 bits to + * contain this value. This value is also used as a mask, so it must + * be one less than a power of two. + */ +#define MAX_PGTABLE_INDEX_SIZE 0xf + +extern struct kmem_cache *pgtable_cache[]; +#define PGT_CACHE(shift) pgtable_cache[shift] + +#ifdef CONFIG_PPC_BOOK3S +#include <asm/book3s/pgalloc.h> +#else +#include <asm/nohash/pgalloc.h> +#endif + +#endif /* _ASM_POWERPC_PGALLOC_H */ |