1#ifndef _ASM_POWERPC_PGALLOC_64_H
  2#define _ASM_POWERPC_PGALLOC_64_H
  3/*
  4 * This program is free software; you can redistribute it and/or
  5 * modify it under the terms of the GNU General Public License
  6 * as published by the Free Software Foundation; either version
  7 * 2 of the License, or (at your option) any later version.
  8 */
  9
 10#include <linux/slab.h>
 11#include <linux/cpumask.h>
 12#include <linux/percpu.h>
 13
 14struct vmemmap_backing {
 15	struct vmemmap_backing *list;
 16	unsigned long phys;
 17	unsigned long virt_addr;
 18};
 19
 20/*
 21 * Functions that deal with pagetables that could be at any level of
 22 * the table need to be passed an "index_size" so they know how to
 23 * handle allocation.  For PTE pages (which are linked to a struct
 24 * page for now, and drawn from the main get_free_pages() pool), the
 25 * allocation size will be (2^index_size * sizeof(pointer)) and
 26 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
 27 *
 28 * The maximum index size needs to be big enough to allow any
 29 * pagetable sizes we need, but small enough to fit in the low bits of
 30 * any page table pointer.  In other words all pagetables, even tiny
 31 * ones, must be aligned to allow at least enough low 0 bits to
 32 * contain this value.  This value is also used as a mask, so it must
 33 * be one less than a power of two.
 34 */
 35#define MAX_PGTABLE_INDEX_SIZE	0xf
 36
 37extern struct kmem_cache *pgtable_cache[];
 38#define PGT_CACHE(shift) (pgtable_cache[(shift)-1])
 39
 40static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 41{
 42	return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
 43}
 44
 45static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 46{
 47	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
 48}
 49
 50#ifndef CONFIG_PPC_64K_PAGES
 51
 52#define pgd_populate(MM, PGD, PUD)	pgd_set(PGD, PUD)
 53
 54static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 55{
 56	return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
 57				GFP_KERNEL|__GFP_REPEAT);
 58}
 59
 60static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 61{
 62	kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
 63}
 64
 65static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 66{
 67	pud_set(pud, (unsigned long)pmd);
 68}
 69
 70#define pmd_populate(mm, pmd, pte_page) \
 71	pmd_populate_kernel(mm, pmd, page_address(pte_page))
 72#define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
 73#define pmd_pgtable(pmd) pmd_page(pmd)
 74
 75
 76#else /* CONFIG_PPC_64K_PAGES */
 77
 78#define pud_populate(mm, pud, pmd)	pud_set(pud, (unsigned long)pmd)
 79
 80static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 81				       pte_t *pte)
 82{
 83	pmd_set(pmd, (unsigned long)pte);
 84}
 85
 86#define pmd_populate(mm, pmd, pte_page) \
 87	pmd_populate_kernel(mm, pmd, page_address(pte_page))
 88#define pmd_pgtable(pmd) pmd_page(pmd)
 89
 90#endif /* CONFIG_PPC_64K_PAGES */
 91
 92static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 93{
 94	return kmem_cache_alloc(PGT_CACHE(PMD_INDEX_SIZE),
 95				GFP_KERNEL|__GFP_REPEAT);
 96}
 97
 98static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 99{
100	kmem_cache_free(PGT_CACHE(PMD_INDEX_SIZE), pmd);
101}
102
103static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
104					  unsigned long address)
105{
106        return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
107}
108
109static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
110					unsigned long address)
111{
112	struct page *page;
113	pte_t *pte;
114
115	pte = pte_alloc_one_kernel(mm, address);
116	if (!pte)
117		return NULL;
118	page = virt_to_page(pte);
119	pgtable_page_ctor(page);
120	return page;
121}
122
123static inline void pgtable_free(void *table, unsigned index_size)
124{
125	if (!index_size)
126		free_page((unsigned long)table);
127	else {
128		BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
129		kmem_cache_free(PGT_CACHE(index_size), table);
130	}
131}
132
133#define __pmd_free_tlb(tlb, pmd, addr)		      \
134	pgtable_free_tlb(tlb, pmd, PMD_INDEX_SIZE)
135#ifndef CONFIG_PPC_64K_PAGES
136#define __pud_free_tlb(tlb, pud, addr)		      \
137	pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
138
139#endif /* CONFIG_PPC_64K_PAGES */
140
141#define check_pgt_cache()	do { } while (0)
142
143#endif /* _ASM_POWERPC_PGALLOC_64_H */