301 lines
6.5 KiB
C
301 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* arch/sparc64/mm/tlb.c
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*
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* Copyright (C) 2004 David S. Miller <davem@redhat.com>
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*/
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#include <linux/kernel.h>
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#include <linux/percpu.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/preempt.h>
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#include <linux/pagemap.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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#include <asm/tlb.h>
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/* Heavily inspired by the ppc64 code. */
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static DEFINE_PER_CPU(struct tlb_batch, tlb_batch);
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void flush_tlb_pending(void)
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{
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struct tlb_batch *tb = &get_cpu_var(tlb_batch);
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struct mm_struct *mm = tb->mm;
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if (!tb->tlb_nr)
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goto out;
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flush_tsb_user(tb);
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if (CTX_VALID(mm->context)) {
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if (tb->tlb_nr == 1) {
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global_flush_tlb_page(mm, tb->vaddrs[0]);
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} else {
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#ifdef CONFIG_SMP
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smp_flush_tlb_pending(tb->mm, tb->tlb_nr,
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&tb->vaddrs[0]);
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#else
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__flush_tlb_pending(CTX_HWBITS(tb->mm->context),
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tb->tlb_nr, &tb->vaddrs[0]);
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#endif
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}
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}
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tb->tlb_nr = 0;
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out:
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put_cpu_var(tlb_batch);
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}
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void arch_enter_lazy_mmu_mode(void)
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{
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struct tlb_batch *tb = this_cpu_ptr(&tlb_batch);
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tb->active = 1;
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}
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void arch_leave_lazy_mmu_mode(void)
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{
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struct tlb_batch *tb = this_cpu_ptr(&tlb_batch);
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if (tb->tlb_nr)
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flush_tlb_pending();
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tb->active = 0;
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}
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static void tlb_batch_add_one(struct mm_struct *mm, unsigned long vaddr,
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bool exec, unsigned int hugepage_shift)
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{
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struct tlb_batch *tb = &get_cpu_var(tlb_batch);
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unsigned long nr;
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vaddr &= PAGE_MASK;
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if (exec)
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vaddr |= 0x1UL;
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nr = tb->tlb_nr;
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if (unlikely(nr != 0 && mm != tb->mm)) {
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flush_tlb_pending();
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nr = 0;
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}
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if (!tb->active) {
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flush_tsb_user_page(mm, vaddr, hugepage_shift);
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global_flush_tlb_page(mm, vaddr);
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goto out;
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}
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if (nr == 0) {
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tb->mm = mm;
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tb->hugepage_shift = hugepage_shift;
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}
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if (tb->hugepage_shift != hugepage_shift) {
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flush_tlb_pending();
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tb->hugepage_shift = hugepage_shift;
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nr = 0;
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}
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tb->vaddrs[nr] = vaddr;
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tb->tlb_nr = ++nr;
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if (nr >= TLB_BATCH_NR)
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flush_tlb_pending();
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out:
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put_cpu_var(tlb_batch);
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}
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void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr,
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pte_t *ptep, pte_t orig, int fullmm,
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unsigned int hugepage_shift)
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{
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if (tlb_type != hypervisor &&
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pte_dirty(orig)) {
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unsigned long paddr, pfn = pte_pfn(orig);
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struct address_space *mapping;
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struct page *page;
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if (!pfn_valid(pfn))
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goto no_cache_flush;
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page = pfn_to_page(pfn);
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if (PageReserved(page))
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goto no_cache_flush;
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/* A real file page? */
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mapping = page_mapping_file(page);
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if (!mapping)
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goto no_cache_flush;
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paddr = (unsigned long) page_address(page);
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if ((paddr ^ vaddr) & (1 << 13))
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flush_dcache_page_all(mm, page);
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}
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no_cache_flush:
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if (!fullmm)
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tlb_batch_add_one(mm, vaddr, pte_exec(orig), hugepage_shift);
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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static void tlb_batch_pmd_scan(struct mm_struct *mm, unsigned long vaddr,
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pmd_t pmd)
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{
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unsigned long end;
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pte_t *pte;
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pte = pte_offset_map(&pmd, vaddr);
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end = vaddr + HPAGE_SIZE;
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while (vaddr < end) {
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if (pte_val(*pte) & _PAGE_VALID) {
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bool exec = pte_exec(*pte);
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tlb_batch_add_one(mm, vaddr, exec, PAGE_SHIFT);
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}
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pte++;
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vaddr += PAGE_SIZE;
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}
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pte_unmap(pte);
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}
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static void __set_pmd_acct(struct mm_struct *mm, unsigned long addr,
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pmd_t orig, pmd_t pmd)
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{
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if (mm == &init_mm)
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return;
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if ((pmd_val(pmd) ^ pmd_val(orig)) & _PAGE_PMD_HUGE) {
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/*
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* Note that this routine only sets pmds for THP pages.
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* Hugetlb pages are handled elsewhere. We need to check
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* for huge zero page. Huge zero pages are like hugetlb
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* pages in that there is no RSS, but there is the need
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* for TSB entries. So, huge zero page counts go into
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* hugetlb_pte_count.
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*/
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if (pmd_val(pmd) & _PAGE_PMD_HUGE) {
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if (is_huge_zero_page(pmd_page(pmd)))
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mm->context.hugetlb_pte_count++;
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else
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mm->context.thp_pte_count++;
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} else {
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if (is_huge_zero_page(pmd_page(orig)))
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mm->context.hugetlb_pte_count--;
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else
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mm->context.thp_pte_count--;
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}
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/* Do not try to allocate the TSB hash table if we
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* don't have one already. We have various locks held
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* and thus we'll end up doing a GFP_KERNEL allocation
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* in an atomic context.
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*
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* Instead, we let the first TLB miss on a hugepage
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* take care of this.
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*/
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}
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if (!pmd_none(orig)) {
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addr &= HPAGE_MASK;
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if (pmd_trans_huge(orig)) {
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pte_t orig_pte = __pte(pmd_val(orig));
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bool exec = pte_exec(orig_pte);
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tlb_batch_add_one(mm, addr, exec, REAL_HPAGE_SHIFT);
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tlb_batch_add_one(mm, addr + REAL_HPAGE_SIZE, exec,
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REAL_HPAGE_SHIFT);
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} else {
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tlb_batch_pmd_scan(mm, addr, orig);
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}
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}
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}
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void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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pmd_t *pmdp, pmd_t pmd)
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{
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pmd_t orig = *pmdp;
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*pmdp = pmd;
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__set_pmd_acct(mm, addr, orig, pmd);
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}
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static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
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unsigned long address, pmd_t *pmdp, pmd_t pmd)
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{
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pmd_t old;
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do {
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old = *pmdp;
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} while (cmpxchg64(&pmdp->pmd, old.pmd, pmd.pmd) != old.pmd);
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__set_pmd_acct(vma->vm_mm, address, old, pmd);
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return old;
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}
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/*
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* This routine is only called when splitting a THP
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*/
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pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
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pmd_t *pmdp)
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{
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pmd_t old, entry;
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entry = __pmd(pmd_val(*pmdp) & ~_PAGE_VALID);
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old = pmdp_establish(vma, address, pmdp, entry);
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flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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/*
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* set_pmd_at() will not be called in a way to decrement
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* thp_pte_count when splitting a THP, so do it now.
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* Sanity check pmd before doing the actual decrement.
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*/
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if ((pmd_val(entry) & _PAGE_PMD_HUGE) &&
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!is_huge_zero_page(pmd_page(entry)))
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(vma->vm_mm)->context.thp_pte_count--;
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return old;
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}
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void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
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pgtable_t pgtable)
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{
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struct list_head *lh = (struct list_head *) pgtable;
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assert_spin_locked(&mm->page_table_lock);
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/* FIFO */
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if (!pmd_huge_pte(mm, pmdp))
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INIT_LIST_HEAD(lh);
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else
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list_add(lh, (struct list_head *) pmd_huge_pte(mm, pmdp));
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pmd_huge_pte(mm, pmdp) = pgtable;
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}
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pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
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{
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struct list_head *lh;
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pgtable_t pgtable;
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assert_spin_locked(&mm->page_table_lock);
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/* FIFO */
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pgtable = pmd_huge_pte(mm, pmdp);
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lh = (struct list_head *) pgtable;
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if (list_empty(lh))
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pmd_huge_pte(mm, pmdp) = NULL;
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else {
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pmd_huge_pte(mm, pmdp) = (pgtable_t) lh->next;
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list_del(lh);
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}
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pte_val(pgtable[0]) = 0;
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pte_val(pgtable[1]) = 0;
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return pgtable;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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