um/tlb: Convert to generic mmu_gather
Generic mmu_gather provides the simple flush_tlb_range() based range tracking mmu_gather UM needs. No change in behavior intended. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nick Piggin <npiggin@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Richard Weinberger <richard@nod.at> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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#ifndef __UM_TLB_H
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#define __UM_TLB_H
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include <asm/percpu.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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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_flush(tlb) flush_tlb_mm((tlb)->mm)
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/* struct mmu_gather is an opaque type used by the mm code for passing around
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* any data needed by arch specific code for tlb_remove_page.
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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 need_flush; /* Really unmapped some ptes? */
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unsigned long start;
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unsigned long end;
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unsigned int fullmm; /* non-zero means full mm 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 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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static inline void init_tlb_gather(struct mmu_gather *tlb)
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{
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tlb->need_flush = 0;
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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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extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
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unsigned long end);
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static inline void
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tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
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{
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flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end);
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}
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static inline void
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tlb_flush_mmu_free(struct mmu_gather *tlb)
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{
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init_tlb_gather(tlb);
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}
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static inline void
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tlb_flush_mmu(struct mmu_gather *tlb)
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{
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if (!tlb->need_flush)
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return;
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tlb_flush_mmu_tlbonly(tlb);
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tlb_flush_mmu_free(tlb);
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}
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/* arch_tlb_finish_mmu
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* Called at the end of the shootdown operation to free up any resources
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* that were required.
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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 (force) {
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tlb->start = start;
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tlb->end = end;
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tlb->need_flush = 1;
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}
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tlb_flush_mmu(tlb);
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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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/* tlb_remove_page
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* Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)),
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* while handling the additional races in SMP caused by other CPUs
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* caching valid mappings in their TLBs.
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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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tlb->need_flush = 1;
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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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/**
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* tlb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.
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*
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* Record the fact that pte's were really umapped in ->need_flush, so we can
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* later optimise away the tlb invalidate. This helps when userspace is
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* unmapping already-unmapped pages, which happens quite a lot.
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*/
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#define tlb_remove_tlb_entry(tlb, ptep, address) \
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do { \
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tlb->need_flush = 1; \
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__tlb_remove_tlb_entry(tlb, ptep, address); \
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} while (0)
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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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static inline void tlb_change_page_size(struct mmu_gather *tlb, 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(tlb, ptep, addr)
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#define pud_free_tlb(tlb, pudp, addr) __pud_free_tlb(tlb, pudp, addr)
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#define pmd_free_tlb(tlb, pmdp, addr) __pmd_free_tlb(tlb, pmdp, addr)
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#define tlb_migrate_finish(mm) do {} while (0)
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#include <asm-generic/cacheflush.h>
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#include <asm-generic/tlb.h>
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#endif
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