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Linux/arch/arm64/include/asm/tlb.h

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  1 /*
  2  * Based on arch/arm/include/asm/tlb.h
  3  *
  4  * Copyright (C) 2002 Russell King
  5  * Copyright (C) 2012 ARM Ltd.
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 18  */
 19 #ifndef __ASM_TLB_H
 20 #define __ASM_TLB_H
 21 
 22 #include <linux/pagemap.h>
 23 #include <linux/swap.h>
 24 
 25 #include <asm/pgalloc.h>
 26 #include <asm/tlbflush.h>
 27 
 28 #define MMU_GATHER_BUNDLE       8
 29 
 30 /*
 31  * TLB handling.  This allows us to remove pages from the page
 32  * tables, and efficiently handle the TLB issues.
 33  */
 34 struct mmu_gather {
 35         struct mm_struct        *mm;
 36         unsigned int            fullmm;
 37         struct vm_area_struct   *vma;
 38         unsigned long           start, end;
 39         unsigned long           range_start;
 40         unsigned long           range_end;
 41         unsigned int            nr;
 42         unsigned int            max;
 43         struct page             **pages;
 44         struct page             *local[MMU_GATHER_BUNDLE];
 45 };
 46 
 47 /*
 48  * This is unnecessarily complex.  There's three ways the TLB shootdown
 49  * code is used:
 50  *  1. Unmapping a range of vmas.  See zap_page_range(), unmap_region().
 51  *     tlb->fullmm = 0, and tlb_start_vma/tlb_end_vma will be called.
 52  *     tlb->vma will be non-NULL.
 53  *  2. Unmapping all vmas.  See exit_mmap().
 54  *     tlb->fullmm = 1, and tlb_start_vma/tlb_end_vma will be called.
 55  *     tlb->vma will be non-NULL.  Additionally, page tables will be freed.
 56  *  3. Unmapping argument pages.  See shift_arg_pages().
 57  *     tlb->fullmm = 0, but tlb_start_vma/tlb_end_vma will not be called.
 58  *     tlb->vma will be NULL.
 59  */
 60 static inline void tlb_flush(struct mmu_gather *tlb)
 61 {
 62         if (tlb->fullmm || !tlb->vma)
 63                 flush_tlb_mm(tlb->mm);
 64         else if (tlb->range_end > 0) {
 65                 flush_tlb_range(tlb->vma, tlb->range_start, tlb->range_end);
 66                 tlb->range_start = TASK_SIZE;
 67                 tlb->range_end = 0;
 68         }
 69 }
 70 
 71 static inline void tlb_add_flush(struct mmu_gather *tlb, unsigned long addr)
 72 {
 73         if (!tlb->fullmm) {
 74                 if (addr < tlb->range_start)
 75                         tlb->range_start = addr;
 76                 if (addr + PAGE_SIZE > tlb->range_end)
 77                         tlb->range_end = addr + PAGE_SIZE;
 78         }
 79 }
 80 
 81 static inline void __tlb_alloc_page(struct mmu_gather *tlb)
 82 {
 83         unsigned long addr = __get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
 84 
 85         if (addr) {
 86                 tlb->pages = (void *)addr;
 87                 tlb->max = PAGE_SIZE / sizeof(struct page *);
 88         }
 89 }
 90 
 91 static inline void tlb_flush_mmu(struct mmu_gather *tlb)
 92 {
 93         tlb_flush(tlb);
 94         free_pages_and_swap_cache(tlb->pages, tlb->nr);
 95         tlb->nr = 0;
 96         if (tlb->pages == tlb->local)
 97                 __tlb_alloc_page(tlb);
 98 }
 99 
100 static inline void
101 tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end)
102 {
103         tlb->mm = mm;
104         tlb->fullmm = !(start | (end+1));
105         tlb->start = start;
106         tlb->end = end;
107         tlb->vma = NULL;
108         tlb->max = ARRAY_SIZE(tlb->local);
109         tlb->pages = tlb->local;
110         tlb->nr = 0;
111         __tlb_alloc_page(tlb);
112 }
113 
114 static inline void
115 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
116 {
117         tlb_flush_mmu(tlb);
118 
119         /* keep the page table cache within bounds */
120         check_pgt_cache();
121 
122         if (tlb->pages != tlb->local)
123                 free_pages((unsigned long)tlb->pages, 0);
124 }
125 
126 /*
127  * Memorize the range for the TLB flush.
128  */
129 static inline void
130 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long addr)
131 {
132         tlb_add_flush(tlb, addr);
133 }
134 
135 /*
136  * In the case of tlb vma handling, we can optimise these away in the
137  * case where we're doing a full MM flush.  When we're doing a munmap,
138  * the vmas are adjusted to only cover the region to be torn down.
139  */
140 static inline void
141 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
142 {
143         if (!tlb->fullmm) {
144                 tlb->vma = vma;
145                 tlb->range_start = TASK_SIZE;
146                 tlb->range_end = 0;
147         }
148 }
149 
150 static inline void
151 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
152 {
153         if (!tlb->fullmm)
154                 tlb_flush(tlb);
155 }
156 
157 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
158 {
159         tlb->pages[tlb->nr++] = page;
160         VM_BUG_ON(tlb->nr > tlb->max);
161         return tlb->max - tlb->nr;
162 }
163 
164 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
165 {
166         if (!__tlb_remove_page(tlb, page))
167                 tlb_flush_mmu(tlb);
168 }
169 
170 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
171         unsigned long addr)
172 {
173         pgtable_page_dtor(pte);
174         tlb_add_flush(tlb, addr);
175         tlb_remove_page(tlb, pte);
176 }
177 
178 #ifndef CONFIG_ARM64_64K_PAGES
179 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
180                                   unsigned long addr)
181 {
182         tlb_add_flush(tlb, addr);
183         tlb_remove_page(tlb, virt_to_page(pmdp));
184 }
185 #endif
186 
187 #define pte_free_tlb(tlb, ptep, addr)   __pte_free_tlb(tlb, ptep, addr)
188 #define pmd_free_tlb(tlb, pmdp, addr)   __pmd_free_tlb(tlb, pmdp, addr)
189 #define pud_free_tlb(tlb, pudp, addr)   pud_free((tlb)->mm, pudp)
190 
191 #define tlb_migrate_finish(mm)          do { } while (0)
192 
193 static inline void
194 tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
195 {
196         tlb_add_flush(tlb, addr);
197 }
198 
199 #endif
200 

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