[linux-2.6-block.git] / arch / powerpc / include / asm / pgalloc.h

/* 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);
}

/* arch use pte_free_defer() implementation in arch/powerpc/mm/pgtable-frag.c */
#define pte_free_defer pte_free_defer
void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);

/*
 * 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 */
Commit	Line	Data
	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	/* arch use pte_free_defer() implementation in arch/powerpc/mm/pgtable-frag.c */
	49	#define pte_free_defer pte_free_defer
	50	void 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
	68	extern 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 */