forked from Minki/linux
e41ceed035
This patch adds virtual address space size and a level of translation tables to kernel configuration. It facilicates introduction of different MMU options, such as 4KB + 4 levels, 16KB + 4 levels and 64KB + 3 levels, easily. The idea is based on the discussion with Catalin Marinas: http://www.spinics.net/linux/lists/arm-kernel/msg319552.html Signed-off-by: Jungseok Lee <jays.lee@samsung.com> Reviewed-by: Sungjinn Chung <sungjinn.chung@samsung.com> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Jungseok Lee <jungseoklee85@gmail.com>
110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/*
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* Based on arch/arm/include/asm/tlb.h
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*
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* Copyright (C) 2002 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_TLB_H
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#define __ASM_TLB_H
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#define __tlb_remove_pmd_tlb_entry __tlb_remove_pmd_tlb_entry
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#include <asm-generic/tlb.h>
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/*
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* There's three ways the TLB shootdown code is used:
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* 1. Unmapping a range of vmas. See zap_page_range(), unmap_region().
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* tlb->fullmm = 0, and tlb_start_vma/tlb_end_vma will be called.
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* 2. Unmapping all vmas. See exit_mmap().
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* tlb->fullmm = 1, and tlb_start_vma/tlb_end_vma will be called.
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* Page tables will be freed.
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* 3. Unmapping argument pages. See shift_arg_pages().
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* tlb->fullmm = 0, but tlb_start_vma/tlb_end_vma will not be called.
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*/
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static inline void tlb_flush(struct mmu_gather *tlb)
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{
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if (tlb->fullmm) {
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flush_tlb_mm(tlb->mm);
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} else if (tlb->end > 0) {
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struct vm_area_struct vma = { .vm_mm = tlb->mm, };
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flush_tlb_range(&vma, tlb->start, tlb->end);
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tlb->start = TASK_SIZE;
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tlb->end = 0;
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}
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}
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static inline void tlb_add_flush(struct mmu_gather *tlb, unsigned long addr)
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{
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if (!tlb->fullmm) {
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tlb->start = min(tlb->start, addr);
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tlb->end = max(tlb->end, addr + PAGE_SIZE);
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}
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}
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/*
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* Memorize the range for the TLB flush.
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*/
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static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
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unsigned long addr)
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{
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tlb_add_flush(tlb, addr);
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}
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/*
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* In the case of tlb vma handling, we can optimise these away in the
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* case where we're doing a full MM flush. When we're doing a munmap,
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* the vmas are adjusted to only cover the region to be torn down.
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*/
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static inline void tlb_start_vma(struct mmu_gather *tlb,
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struct vm_area_struct *vma)
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{
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if (!tlb->fullmm) {
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tlb->start = TASK_SIZE;
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tlb->end = 0;
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}
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}
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static inline void tlb_end_vma(struct mmu_gather *tlb,
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struct vm_area_struct *vma)
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{
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if (!tlb->fullmm)
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tlb_flush(tlb);
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}
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static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
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unsigned long addr)
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{
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pgtable_page_dtor(pte);
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tlb_add_flush(tlb, addr);
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tlb_remove_page(tlb, pte);
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}
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#ifndef CONFIG_ARM64_2_LEVELS
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static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
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unsigned long addr)
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{
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tlb_add_flush(tlb, addr);
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tlb_remove_page(tlb, virt_to_page(pmdp));
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}
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#endif
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static inline void __tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp,
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unsigned long address)
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{
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tlb_add_flush(tlb, address);
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}
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#endif
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