Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 380 insertions, 0 deletions

diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
new file mode 100644
index 0000000000..4fcd959dcc
--- /dev/null
+++ b/mm/pgtable-generic.c
@@ -0,0 +1,380 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  mm/pgtable-generic.c
+ *
+ *  Generic pgtable methods declared in linux/pgtable.h
+ *
+ *  Copyright (C) 2010  Linus Torvalds
+ */
+
+#include <linux/pagemap.h>
+#include <linux/hugetlb.h>
+#include <linux/pgtable.h>
+#include <linux/swap.h>
+#include <linux/swapops.h>
+#include <linux/mm_inline.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+
+/*
+ * If a p?d_bad entry is found while walking page tables, report
+ * the error, before resetting entry to p?d_none.  Usually (but
+ * very seldom) called out from the p?d_none_or_clear_bad macros.
+ */
+
+void pgd_clear_bad(pgd_t *pgd)
+{
+	pgd_ERROR(*pgd);
+	pgd_clear(pgd);
+}
+
+#ifndef __PAGETABLE_P4D_FOLDED
+void p4d_clear_bad(p4d_t *p4d)
+{
+	p4d_ERROR(*p4d);
+	p4d_clear(p4d);
+}
+#endif
+
+#ifndef __PAGETABLE_PUD_FOLDED
+void pud_clear_bad(pud_t *pud)
+{
+	pud_ERROR(*pud);
+	pud_clear(pud);
+}
+#endif
+
+/*
+ * Note that the pmd variant below can't be stub'ed out just as for p4d/pud
+ * above. pmd folding is special and typically pmd_* macros refer to upper
+ * level even when folded
+ */
+void pmd_clear_bad(pmd_t *pmd)
+{
+	pmd_ERROR(*pmd);
+	pmd_clear(pmd);
+}
+
+#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+/*
+ * Only sets the access flags (dirty, accessed), as well as write
+ * permission. Furthermore, we know it always gets set to a "more
+ * permissive" setting, which allows most architectures to optimize
+ * this. We return whether the PTE actually changed, which in turn
+ * instructs the caller to do things like update__mmu_cache.  This
+ * used to be done in the caller, but sparc needs minor faults to
+ * force that call on sun4c so we changed this macro slightly
+ */
+int ptep_set_access_flags(struct vm_area_struct *vma,
+			  unsigned long address, pte_t *ptep,
+			  pte_t entry, int dirty)
+{
+	int changed = !pte_same(ptep_get(ptep), entry);
+	if (changed) {
+		set_pte_at(vma->vm_mm, address, ptep, entry);
+		flush_tlb_fix_spurious_fault(vma, address, ptep);
+	}
+	return changed;
+}
+#endif
+
+#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
+int ptep_clear_flush_young(struct vm_area_struct *vma,
+			   unsigned long address, pte_t *ptep)
+{
+	int young;
+	young = ptep_test_and_clear_young(vma, address, ptep);
+	if (young)
+		flush_tlb_page(vma, address);
+	return young;
+}
+#endif
+
+#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
+pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
+		       pte_t *ptep)
+{
+	struct mm_struct *mm = (vma)->vm_mm;
+	pte_t pte;
+	pte = ptep_get_and_clear(mm, address, ptep);
+	if (pte_accessible(mm, pte))
+		flush_tlb_page(vma, address);
+	return pte;
+}
+#endif
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+
+#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
+int pmdp_set_access_flags(struct vm_area_struct *vma,
+			  unsigned long address, pmd_t *pmdp,
+			  pmd_t entry, int dirty)
+{
+	int changed = !pmd_same(*pmdp, entry);
+	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+	if (changed) {
+		set_pmd_at(vma->vm_mm, address, pmdp, entry);
+		flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+	}
+	return changed;
+}
+#endif
+
+#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
+int pmdp_clear_flush_young(struct vm_area_struct *vma,
+			   unsigned long address, pmd_t *pmdp)
+{
+	int young;
+	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+	young = pmdp_test_and_clear_young(vma, address, pmdp);
+	if (young)
+		flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+	return young;
+}
+#endif
+
+#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
+pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
+			    pmd_t *pmdp)
+{
+	pmd_t pmd;
+	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+	VM_BUG_ON(pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
+			   !pmd_devmap(*pmdp));
+	pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
+	flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+	return pmd;
+}
+
+#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
+pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
+			    pud_t *pudp)
+{
+	pud_t pud;
+
+	VM_BUG_ON(address & ~HPAGE_PUD_MASK);
+	VM_BUG_ON(!pud_trans_huge(*pudp) && !pud_devmap(*pudp));
+	pud = pudp_huge_get_and_clear(vma->vm_mm, address, pudp);
+	flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
+	return pud;
+}
+#endif
+#endif
+
+#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
+void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
+				pgtable_t pgtable)
+{
+	assert_spin_locked(pmd_lockptr(mm, pmdp));
+
+	/* FIFO */
+	if (!pmd_huge_pte(mm, pmdp))
+		INIT_LIST_HEAD(&pgtable->lru);
+	else
+		list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
+	pmd_huge_pte(mm, pmdp) = pgtable;
+}
+#endif
+
+#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
+/* no "address" argument so destroys page coloring of some arch */
+pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
+{
+	pgtable_t pgtable;
+
+	assert_spin_locked(pmd_lockptr(mm, pmdp));
+
+	/* FIFO */
+	pgtable = pmd_huge_pte(mm, pmdp);
+	pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru,
+							  struct page, lru);
+	if (pmd_huge_pte(mm, pmdp))
+		list_del(&pgtable->lru);
+	return pgtable;
+}
+#endif
+
+#ifndef __HAVE_ARCH_PMDP_INVALIDATE
+pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
+		     pmd_t *pmdp)
+{
+	pmd_t old = pmdp_establish(vma, address, pmdp, pmd_mkinvalid(*pmdp));
+	flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+	return old;
+}
+#endif
+
+#ifndef __HAVE_ARCH_PMDP_INVALIDATE_AD
+pmd_t pmdp_invalidate_ad(struct vm_area_struct *vma, unsigned long address,
+			 pmd_t *pmdp)
+{
+	return pmdp_invalidate(vma, address, pmdp);
+}
+#endif
+
+#ifndef pmdp_collapse_flush
+pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
+			  pmd_t *pmdp)
+{
+	/*
+	 * pmd and hugepage pte format are same. So we could
+	 * use the same function.
+	 */
+	pmd_t pmd;
+
+	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+	VM_BUG_ON(pmd_trans_huge(*pmdp));
+	pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
+
+	/* collapse entails shooting down ptes not pmd */
+	flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+	return pmd;
+}
+#endif
+
+/* arch define pte_free_defer in asm/pgalloc.h for its own implementation */
+#ifndef pte_free_defer
+static void pte_free_now(struct rcu_head *head)
+{
+	struct page *page;
+
+	page = container_of(head, struct page, rcu_head);
+	pte_free(NULL /* mm not passed and not used */, (pgtable_t)page);
+}
+
+void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable)
+{
+	struct page *page;
+
+	page = pgtable;
+	call_rcu(&page->rcu_head, pte_free_now);
+}
+#endif /* pte_free_defer */
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+#if defined(CONFIG_GUP_GET_PXX_LOW_HIGH) && \
+	(defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RCU))
+/*
+ * See the comment above ptep_get_lockless() in include/linux/pgtable.h:
+ * the barriers in pmdp_get_lockless() cannot guarantee that the value in
+ * pmd_high actually belongs with the value in pmd_low; but holding interrupts
+ * off blocks the TLB flush between present updates, which guarantees that a
+ * successful __pte_offset_map() points to a page from matched halves.
+ */
+static unsigned long pmdp_get_lockless_start(void)
+{
+	unsigned long irqflags;
+
+	local_irq_save(irqflags);
+	return irqflags;
+}
+static void pmdp_get_lockless_end(unsigned long irqflags)
+{
+	local_irq_restore(irqflags);
+}
+#else
+static unsigned long pmdp_get_lockless_start(void) { return 0; }
+static void pmdp_get_lockless_end(unsigned long irqflags) { }
+#endif
+
+pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp)
+{
+	unsigned long irqflags;
+	pmd_t pmdval;
+
+	rcu_read_lock();
+	irqflags = pmdp_get_lockless_start();
+	pmdval = pmdp_get_lockless(pmd);
+	pmdp_get_lockless_end(irqflags);
+
+	if (pmdvalp)
+		*pmdvalp = pmdval;
+	if (unlikely(pmd_none(pmdval) || is_pmd_migration_entry(pmdval)))
+		goto nomap;
+	if (unlikely(pmd_trans_huge(pmdval) || pmd_devmap(pmdval)))
+		goto nomap;
+	if (unlikely(pmd_bad(pmdval))) {
+		pmd_clear_bad(pmd);
+		goto nomap;
+	}
+	return __pte_map(&pmdval, addr);
+nomap:
+	rcu_read_unlock();
+	return NULL;
+}
+
+pte_t *pte_offset_map_nolock(struct mm_struct *mm, pmd_t *pmd,
+			     unsigned long addr, spinlock_t **ptlp)
+{
+	pmd_t pmdval;
+	pte_t *pte;
+
+	pte = __pte_offset_map(pmd, addr, &pmdval);
+	if (likely(pte))
+		*ptlp = pte_lockptr(mm, &pmdval);
+	return pte;
+}
+
+/*
+ * pte_offset_map_lock(mm, pmd, addr, ptlp), and its internal implementation
+ * __pte_offset_map_lock() below, is usually called with the pmd pointer for
+ * addr, reached by walking down the mm's pgd, p4d, pud for addr: either while
+ * holding mmap_lock or vma lock for read or for write; or in truncate or rmap
+ * context, while holding file's i_mmap_lock or anon_vma lock for read (or for
+ * write). In a few cases, it may be used with pmd pointing to a pmd_t already
+ * copied to or constructed on the stack.
+ *
+ * When successful, it returns the pte pointer for addr, with its page table
+ * kmapped if necessary (when CONFIG_HIGHPTE), and locked against concurrent
+ * modification by software, with a pointer to that spinlock in ptlp (in some
+ * configs mm->page_table_lock, in SPLIT_PTLOCK configs a spinlock in table's
+ * struct page).  pte_unmap_unlock(pte, ptl) to unlock and unmap afterwards.
+ *
+ * But it is unsuccessful, returning NULL with *ptlp unchanged, if there is no
+ * page table at *pmd: if, for example, the page table has just been removed,
+ * or replaced by the huge pmd of a THP.  (When successful, *pmd is rechecked
+ * after acquiring the ptlock, and retried internally if it changed: so that a
+ * page table can be safely removed or replaced by THP while holding its lock.)
+ *
+ * pte_offset_map(pmd, addr), and its internal helper __pte_offset_map() above,
+ * just returns the pte pointer for addr, its page table kmapped if necessary;
+ * or NULL if there is no page table at *pmd.  It does not attempt to lock the
+ * page table, so cannot normally be used when the page table is to be updated,
+ * or when entries read must be stable.  But it does take rcu_read_lock(): so
+ * that even when page table is racily removed, it remains a valid though empty
+ * and disconnected table.  Until pte_unmap(pte) unmaps and rcu_read_unlock()s
+ * afterwards.
+ *
+ * pte_offset_map_nolock(mm, pmd, addr, ptlp), above, is like pte_offset_map();
+ * but when successful, it also outputs a pointer to the spinlock in ptlp - as
+ * pte_offset_map_lock() does, but in this case without locking it.  This helps
+ * the caller to avoid a later pte_lockptr(mm, *pmd), which might by that time
+ * act on a changed *pmd: pte_offset_map_nolock() provides the correct spinlock
+ * pointer for the page table that it returns.  In principle, the caller should
+ * recheck *pmd once the lock is taken; in practice, no callsite needs that -
+ * either the mmap_lock for write, or pte_same() check on contents, is enough.
+ *
+ * Note that free_pgtables(), used after unmapping detached vmas, or when
+ * exiting the whole mm, does not take page table lock before freeing a page
+ * table, and may not use RCU at all: "outsiders" like khugepaged should avoid
+ * pte_offset_map() and co once the vma is detached from mm or mm_users is zero.
+ */
+pte_t *__pte_offset_map_lock(struct mm_struct *mm, pmd_t *pmd,
+			     unsigned long addr, spinlock_t **ptlp)
+{
+	spinlock_t *ptl;
+	pmd_t pmdval;
+	pte_t *pte;
+again:
+	pte = __pte_offset_map(pmd, addr, &pmdval);
+	if (unlikely(!pte))
+		return pte;
+	ptl = pte_lockptr(mm, &pmdval);
+	spin_lock(ptl);
+	if (likely(pmd_same(pmdval, pmdp_get_lockless(pmd)))) {
+		*ptlp = ptl;
+		return pte;
+	}
+	pte_unmap_unlock(pte, ptl);
+	goto again;
+}