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 
14 struct vmemmap_backing {
15 	struct vmemmap_backing *list;
16 	unsigned long phys;
17 	unsigned long virt_addr;
18 };
19 extern struct vmemmap_backing *vmemmap_list;
20 
21 /*
22  * Functions that deal with pagetables that could be at any level of
23  * the table need to be passed an "index_size" so they know how to
24  * handle allocation.  For PTE pages (which are linked to a struct
25  * page for now, and drawn from the main get_free_pages() pool), the
26  * allocation size will be (2^index_size * sizeof(pointer)) and
27  * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
28  *
29  * The maximum index size needs to be big enough to allow any
30  * pagetable sizes we need, but small enough to fit in the low bits of
31  * any page table pointer.  In other words all pagetables, even tiny
32  * ones, must be aligned to allow at least enough low 0 bits to
33  * contain this value.  This value is also used as a mask, so it must
34  * be one less than a power of two.
35  */
36 #define MAX_PGTABLE_INDEX_SIZE	0xf
37 
38 extern struct kmem_cache *pgtable_cache[];
39 #define PGT_CACHE(shift) ({				\
40 			BUG_ON(!(shift));		\
41 			pgtable_cache[(shift) - 1];	\
42 		})
43 
44 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
45 {
46 	return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
47 			pgtable_gfp_flags(mm, GFP_KERNEL));
48 }
49 
50 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
51 {
52 	kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
53 }
54 
55 #ifndef CONFIG_PPC_64K_PAGES
56 
57 #define pgd_populate(MM, PGD, PUD)	pgd_set(PGD, (unsigned long)PUD)
58 
59 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
60 {
61 	return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
62 			pgtable_gfp_flags(mm, GFP_KERNEL));
63 }
64 
65 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
66 {
67 	kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
68 }
69 
70 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
71 {
72 	pud_set(pud, (unsigned long)pmd);
73 }
74 
75 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
76 				       pte_t *pte)
77 {
78 	pmd_set(pmd, (unsigned long)pte);
79 }
80 
81 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
82 				pgtable_t pte_page)
83 {
84 	pmd_set(pmd, (unsigned long)page_address(pte_page));
85 }
86 
87 #define pmd_pgtable(pmd) pmd_page(pmd)
88 
89 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
90 					  unsigned long address)
91 {
92 	return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
93 }
94 
95 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
96 				      unsigned long address)
97 {
98 	struct page *page;
99 	pte_t *pte;
100 
101 	pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT);
102 	if (!pte)
103 		return NULL;
104 	page = virt_to_page(pte);
105 	if (!pgtable_page_ctor(page)) {
106 		__free_page(page);
107 		return NULL;
108 	}
109 	return page;
110 }
111 
112 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
113 {
114 	free_page((unsigned long)pte);
115 }
116 
117 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
118 {
119 	pgtable_page_dtor(ptepage);
120 	__free_page(ptepage);
121 }
122 
123 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
124 #ifdef CONFIG_SMP
125 extern void __tlb_remove_table(void *_table);
126 #endif
127 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
128 				  unsigned long address)
129 {
130 	tlb_flush_pgtable(tlb, address);
131 	pgtable_free_tlb(tlb, page_address(table), 0);
132 }
133 
134 #else /* if CONFIG_PPC_64K_PAGES */
135 
136 extern pte_t *pte_fragment_alloc(struct mm_struct *, unsigned long, int);
137 extern void pte_fragment_free(unsigned long *, int);
138 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
139 #ifdef CONFIG_SMP
140 extern void __tlb_remove_table(void *_table);
141 #endif
142 
143 #define pud_populate(mm, pud, pmd)	pud_set(pud, (unsigned long)pmd)
144 
145 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
146 				       pte_t *pte)
147 {
148 	pmd_set(pmd, (unsigned long)pte);
149 }
150 
151 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
152 				pgtable_t pte_page)
153 {
154 	pmd_set(pmd, (unsigned long)pte_page);
155 }
156 
157 static inline pgtable_t pmd_pgtable(pmd_t pmd)
158 {
159 	return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS);
160 }
161 
162 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
163 					  unsigned long address)
164 {
165 	return (pte_t *)pte_fragment_alloc(mm, address, 1);
166 }
167 
168 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
169 					unsigned long address)
170 {
171 	return (pgtable_t)pte_fragment_alloc(mm, address, 0);
172 }
173 
174 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
175 {
176 	pte_fragment_free((unsigned long *)pte, 1);
177 }
178 
179 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
180 {
181 	pte_fragment_free((unsigned long *)ptepage, 0);
182 }
183 
184 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
185 				  unsigned long address)
186 {
187 	tlb_flush_pgtable(tlb, address);
188 	pgtable_free_tlb(tlb, table, 0);
189 }
190 #endif /* CONFIG_PPC_64K_PAGES */
191 
192 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
193 {
194 	return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
195 			pgtable_gfp_flags(mm, GFP_KERNEL));
196 }
197 
198 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
199 {
200 	kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
201 }
202 
203 #define __pmd_free_tlb(tlb, pmd, addr)		      \
204 	pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
205 #ifndef CONFIG_PPC_64K_PAGES
206 #define __pud_free_tlb(tlb, pud, addr)		      \
207 	pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
208 
209 #endif /* CONFIG_PPC_64K_PAGES */
210 
211 #define check_pgt_cache()	do { } while (0)
212 
213 #endif /* _ASM_POWERPC_PGALLOC_64_H */
214