2 * Based on arch/arm/include/asm/tlb.h
4 * Copyright (C) 2002 Russell King
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
22 #define __tlb_remove_pmd_tlb_entry __tlb_remove_pmd_tlb_entry
24 #include <asm-generic/tlb.h>
27 * There's three ways the TLB shootdown code is used:
28 * 1. Unmapping a range of vmas. See zap_page_range(), unmap_region().
29 * tlb->fullmm = 0, and tlb_start_vma/tlb_end_vma will be called.
30 * 2. Unmapping all vmas. See exit_mmap().
31 * tlb->fullmm = 1, and tlb_start_vma/tlb_end_vma will be called.
32 * Page tables will be freed.
33 * 3. Unmapping argument pages. See shift_arg_pages().
34 * tlb->fullmm = 0, but tlb_start_vma/tlb_end_vma will not be called.
36 static inline void tlb_flush(struct mmu_gather *tlb)
39 flush_tlb_mm(tlb->mm);
40 } else if (tlb->end > 0) {
41 struct vm_area_struct vma = { .vm_mm = tlb->mm, };
42 flush_tlb_range(&vma, tlb->start, tlb->end);
43 tlb->start = TASK_SIZE;
48 static inline void tlb_add_flush(struct mmu_gather *tlb, unsigned long addr)
51 tlb->start = min(tlb->start, addr);
52 tlb->end = max(tlb->end, addr + PAGE_SIZE);
57 * Memorize the range for the TLB flush.
59 static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
62 tlb_add_flush(tlb, addr);
66 * In the case of tlb vma handling, we can optimise these away in the
67 * case where we're doing a full MM flush. When we're doing a munmap,
68 * the vmas are adjusted to only cover the region to be torn down.
70 static inline void tlb_start_vma(struct mmu_gather *tlb,
71 struct vm_area_struct *vma)
74 tlb->start = TASK_SIZE;
79 static inline void tlb_end_vma(struct mmu_gather *tlb,
80 struct vm_area_struct *vma)
86 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
89 pgtable_page_dtor(pte);
90 tlb_add_flush(tlb, addr);
91 tlb_remove_page(tlb, pte);
94 #if CONFIG_ARM64_PGTABLE_LEVELS > 2
95 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
98 tlb_add_flush(tlb, addr);
99 tlb_remove_page(tlb, virt_to_page(pmdp));
103 #if CONFIG_ARM64_PGTABLE_LEVELS > 3
104 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
107 tlb_add_flush(tlb, addr);
108 tlb_remove_page(tlb, virt_to_page(pudp));
112 static inline void __tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp,
113 unsigned long address)
115 tlb_add_flush(tlb, address);