170 lines
3.9 KiB
C
170 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_TLB_H
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#define __ASM_SH_TLB_H
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#ifdef CONFIG_SUPERH64
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# include <asm/tlb_64.h>
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#endif
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#ifndef __ASSEMBLY__
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#include <linux/pagemap.h>
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#ifdef CONFIG_MMU
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#include <linux/swap.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
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/*
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* TLB handling. This allows us to remove pages from the page
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* tables, and efficiently handle the TLB issues.
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*/
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struct mmu_gather {
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struct mm_struct *mm;
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unsigned int fullmm;
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unsigned long start, end;
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};
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static inline void init_tlb_gather(struct mmu_gather *tlb)
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{
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tlb->start = TASK_SIZE;
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tlb->end = 0;
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if (tlb->fullmm) {
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tlb->start = 0;
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tlb->end = TASK_SIZE;
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}
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}
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static inline void
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arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
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unsigned long start, unsigned long end)
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{
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tlb->mm = mm;
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tlb->start = start;
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tlb->end = end;
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tlb->fullmm = !(start | (end+1));
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init_tlb_gather(tlb);
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}
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static inline void
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arch_tlb_finish_mmu(struct mmu_gather *tlb,
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unsigned long start, unsigned long end, bool force)
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{
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if (tlb->fullmm || force)
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flush_tlb_mm(tlb->mm);
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/* keep the page table cache within bounds */
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check_pgt_cache();
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}
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static inline void
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tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
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{
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if (tlb->start > address)
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tlb->start = address;
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if (tlb->end < address + PAGE_SIZE)
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tlb->end = address + PAGE_SIZE;
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}
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#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \
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tlb_remove_tlb_entry(tlb, ptep, address)
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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
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tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
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{
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if (!tlb->fullmm)
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flush_cache_range(vma, vma->vm_start, vma->vm_end);
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}
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static inline void
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tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
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{
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if (!tlb->fullmm && tlb->end) {
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flush_tlb_range(vma, tlb->start, tlb->end);
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init_tlb_gather(tlb);
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}
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}
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static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
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{
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}
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static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
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{
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}
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static inline void tlb_flush_mmu(struct mmu_gather *tlb)
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{
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}
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static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
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{
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free_page_and_swap_cache(page);
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return false; /* avoid calling tlb_flush_mmu */
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}
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static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
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{
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__tlb_remove_page(tlb, page);
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}
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static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
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struct page *page, int page_size)
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{
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return __tlb_remove_page(tlb, page);
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}
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static inline void tlb_remove_page_size(struct mmu_gather *tlb,
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struct page *page, int page_size)
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{
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return tlb_remove_page(tlb, page);
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}
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#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
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static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
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unsigned int page_size)
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{
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}
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#define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep)
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#define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp)
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#define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp)
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#define tlb_migrate_finish(mm) do { } while (0)
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#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
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extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
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extern void tlb_unwire_entry(void);
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#else
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static inline void tlb_wire_entry(struct vm_area_struct *vma ,
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unsigned long addr, pte_t pte)
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{
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BUG();
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}
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static inline void tlb_unwire_entry(void)
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{
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BUG();
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}
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#endif
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#else /* CONFIG_MMU */
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#define tlb_start_vma(tlb, vma) do { } while (0)
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#define tlb_end_vma(tlb, vma) do { } while (0)
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#define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0)
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#define tlb_flush(tlb) do { } while (0)
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#include <asm-generic/tlb.h>
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#endif /* CONFIG_MMU */
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_SH_TLB_H */
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