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1357 lines
39 KiB
1357 lines
39 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* This kernel test validates architecture page table helpers and |
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* accessors and helps in verifying their continued compliance with |
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* expected generic MM semantics. |
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* |
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* Copyright (C) 2019 ARM Ltd. |
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* |
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* Author: Anshuman Khandual <[email protected]> |
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*/ |
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#define pr_fmt(fmt) "debug_vm_pgtable: [%-25s]: " fmt, __func__ |
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#include <linux/gfp.h> |
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#include <linux/highmem.h> |
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#include <linux/hugetlb.h> |
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#include <linux/kernel.h> |
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#include <linux/kconfig.h> |
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#include <linux/mm.h> |
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#include <linux/mman.h> |
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#include <linux/mm_types.h> |
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#include <linux/module.h> |
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#include <linux/pfn_t.h> |
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#include <linux/printk.h> |
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#include <linux/pgtable.h> |
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#include <linux/random.h> |
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#include <linux/spinlock.h> |
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#include <linux/swap.h> |
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#include <linux/swapops.h> |
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#include <linux/start_kernel.h> |
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#include <linux/sched/mm.h> |
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#include <linux/io.h> |
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#include <asm/cacheflush.h> |
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#include <asm/pgalloc.h> |
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#include <asm/tlbflush.h> |
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/* |
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* Please refer Documentation/mm/arch_pgtable_helpers.rst for the semantics |
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* expectations that are being validated here. All future changes in here |
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* or the documentation need to be in sync. |
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*/ |
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#define VMFLAGS (VM_READ|VM_WRITE|VM_EXEC) |
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|
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/* |
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* On s390 platform, the lower 4 bits are used to identify given page table |
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* entry type. But these bits might affect the ability to clear entries with |
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* pxx_clear() because of how dynamic page table folding works on s390. So |
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* while loading up the entries do not change the lower 4 bits. It does not |
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* have affect any other platform. Also avoid the 62nd bit on ppc64 that is |
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* used to mark a pte entry. |
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*/ |
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#define S390_SKIP_MASK GENMASK(3, 0) |
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#if __BITS_PER_LONG == 64 |
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#define PPC64_SKIP_MASK GENMASK(62, 62) |
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#else |
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#define PPC64_SKIP_MASK 0x0 |
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#endif |
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#define ARCH_SKIP_MASK (S390_SKIP_MASK | PPC64_SKIP_MASK) |
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#define RANDOM_ORVALUE (GENMASK(BITS_PER_LONG - 1, 0) & ~ARCH_SKIP_MASK) |
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#define RANDOM_NZVALUE GENMASK(7, 0) |
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struct pgtable_debug_args { |
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struct mm_struct *mm; |
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struct vm_area_struct *vma; |
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pgd_t *pgdp; |
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p4d_t *p4dp; |
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pud_t *pudp; |
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pmd_t *pmdp; |
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pte_t *ptep; |
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p4d_t *start_p4dp; |
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pud_t *start_pudp; |
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pmd_t *start_pmdp; |
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pgtable_t start_ptep; |
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unsigned long vaddr; |
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pgprot_t page_prot; |
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pgprot_t page_prot_none; |
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bool is_contiguous_page; |
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unsigned long pud_pfn; |
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unsigned long pmd_pfn; |
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unsigned long pte_pfn; |
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unsigned long fixed_pgd_pfn; |
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unsigned long fixed_p4d_pfn; |
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unsigned long fixed_pud_pfn; |
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unsigned long fixed_pmd_pfn; |
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unsigned long fixed_pte_pfn; |
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}; |
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static void __init pte_basic_tests(struct pgtable_debug_args *args, int idx) |
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{ |
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pgprot_t prot = vm_get_page_prot(idx); |
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pte_t pte = pfn_pte(args->fixed_pte_pfn, prot); |
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unsigned long val = idx, *ptr = &val; |
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pr_debug("Validating PTE basic (%pGv)\n", ptr); |
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/* |
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* This test needs to be executed after the given page table entry |
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* is created with pfn_pte() to make sure that vm_get_page_prot(idx) |
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* does not have the dirty bit enabled from the beginning. This is |
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* important for platforms like arm64 where (!PTE_RDONLY) indicate |
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* dirty bit being set. |
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*/ |
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WARN_ON(pte_dirty(pte_wrprotect(pte))); |
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WARN_ON(!pte_same(pte, pte)); |
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WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte)))); |
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WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte)))); |
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WARN_ON(!pte_write(pte_mkwrite(pte_wrprotect(pte)))); |
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WARN_ON(pte_young(pte_mkold(pte_mkyoung(pte)))); |
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WARN_ON(pte_dirty(pte_mkclean(pte_mkdirty(pte)))); |
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WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte)))); |
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WARN_ON(pte_dirty(pte_wrprotect(pte_mkclean(pte)))); |
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WARN_ON(!pte_dirty(pte_wrprotect(pte_mkdirty(pte)))); |
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} |
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static void __init pte_advanced_tests(struct pgtable_debug_args *args) |
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{ |
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struct page *page; |
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pte_t pte; |
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/* |
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* Architectures optimize set_pte_at by avoiding TLB flush. |
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* This requires set_pte_at to be not used to update an |
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* existing pte entry. Clear pte before we do set_pte_at |
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* |
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* flush_dcache_page() is called after set_pte_at() to clear |
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* PG_arch_1 for the page on ARM64. The page flag isn't cleared |
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* when it's released and page allocation check will fail when |
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* the page is allocated again. For architectures other than ARM64, |
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* the unexpected overhead of cache flushing is acceptable. |
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*/ |
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page = (args->pte_pfn != ULONG_MAX) ? pfn_to_page(args->pte_pfn) : NULL; |
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if (!page) |
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return; |
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pr_debug("Validating PTE advanced\n"); |
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pte = pfn_pte(args->pte_pfn, args->page_prot); |
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set_pte_at(args->mm, args->vaddr, args->ptep, pte); |
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flush_dcache_page(page); |
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ptep_set_wrprotect(args->mm, args->vaddr, args->ptep); |
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pte = ptep_get(args->ptep); |
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WARN_ON(pte_write(pte)); |
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ptep_get_and_clear(args->mm, args->vaddr, args->ptep); |
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pte = ptep_get(args->ptep); |
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WARN_ON(!pte_none(pte)); |
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pte = pfn_pte(args->pte_pfn, args->page_prot); |
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pte = pte_wrprotect(pte); |
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pte = pte_mkclean(pte); |
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set_pte_at(args->mm, args->vaddr, args->ptep, pte); |
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flush_dcache_page(page); |
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pte = pte_mkwrite(pte); |
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pte = pte_mkdirty(pte); |
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ptep_set_access_flags(args->vma, args->vaddr, args->ptep, pte, 1); |
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pte = ptep_get(args->ptep); |
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WARN_ON(!(pte_write(pte) && pte_dirty(pte))); |
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ptep_get_and_clear_full(args->mm, args->vaddr, args->ptep, 1); |
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pte = ptep_get(args->ptep); |
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WARN_ON(!pte_none(pte)); |
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pte = pfn_pte(args->pte_pfn, args->page_prot); |
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pte = pte_mkyoung(pte); |
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set_pte_at(args->mm, args->vaddr, args->ptep, pte); |
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flush_dcache_page(page); |
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ptep_test_and_clear_young(args->vma, args->vaddr, args->ptep); |
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pte = ptep_get(args->ptep); |
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WARN_ON(pte_young(pte)); |
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ptep_get_and_clear_full(args->mm, args->vaddr, args->ptep, 1); |
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} |
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static void __init pte_savedwrite_tests(struct pgtable_debug_args *args) |
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{ |
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pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot_none); |
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if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) |
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return; |
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pr_debug("Validating PTE saved write\n"); |
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WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte)))); |
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WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte)))); |
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} |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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static void __init pmd_basic_tests(struct pgtable_debug_args *args, int idx) |
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{ |
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pgprot_t prot = vm_get_page_prot(idx); |
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unsigned long val = idx, *ptr = &val; |
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pmd_t pmd; |
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if (!has_transparent_hugepage()) |
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return; |
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pr_debug("Validating PMD basic (%pGv)\n", ptr); |
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pmd = pfn_pmd(args->fixed_pmd_pfn, prot); |
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/* |
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* This test needs to be executed after the given page table entry |
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* is created with pfn_pmd() to make sure that vm_get_page_prot(idx) |
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* does not have the dirty bit enabled from the beginning. This is |
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* important for platforms like arm64 where (!PTE_RDONLY) indicate |
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* dirty bit being set. |
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*/ |
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WARN_ON(pmd_dirty(pmd_wrprotect(pmd))); |
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WARN_ON(!pmd_same(pmd, pmd)); |
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WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd)))); |
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WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd)))); |
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WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd)))); |
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WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd)))); |
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WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd)))); |
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WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd)))); |
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WARN_ON(pmd_dirty(pmd_wrprotect(pmd_mkclean(pmd)))); |
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WARN_ON(!pmd_dirty(pmd_wrprotect(pmd_mkdirty(pmd)))); |
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/* |
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* A huge page does not point to next level page table |
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* entry. Hence this must qualify as pmd_bad(). |
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*/ |
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WARN_ON(!pmd_bad(pmd_mkhuge(pmd))); |
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} |
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static void __init pmd_advanced_tests(struct pgtable_debug_args *args) |
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{ |
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struct page *page; |
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pmd_t pmd; |
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unsigned long vaddr = args->vaddr; |
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if (!has_transparent_hugepage()) |
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return; |
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page = (args->pmd_pfn != ULONG_MAX) ? pfn_to_page(args->pmd_pfn) : NULL; |
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if (!page) |
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return; |
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/* |
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* flush_dcache_page() is called after set_pmd_at() to clear |
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* PG_arch_1 for the page on ARM64. The page flag isn't cleared |
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* when it's released and page allocation check will fail when |
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* the page is allocated again. For architectures other than ARM64, |
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* the unexpected overhead of cache flushing is acceptable. |
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*/ |
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pr_debug("Validating PMD advanced\n"); |
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/* Align the address wrt HPAGE_PMD_SIZE */ |
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vaddr &= HPAGE_PMD_MASK; |
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pgtable_trans_huge_deposit(args->mm, args->pmdp, args->start_ptep); |
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pmd = pfn_pmd(args->pmd_pfn, args->page_prot); |
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set_pmd_at(args->mm, vaddr, args->pmdp, pmd); |
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flush_dcache_page(page); |
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pmdp_set_wrprotect(args->mm, vaddr, args->pmdp); |
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pmd = READ_ONCE(*args->pmdp); |
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WARN_ON(pmd_write(pmd)); |
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pmdp_huge_get_and_clear(args->mm, vaddr, args->pmdp); |
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pmd = READ_ONCE(*args->pmdp); |
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WARN_ON(!pmd_none(pmd)); |
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pmd = pfn_pmd(args->pmd_pfn, args->page_prot); |
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pmd = pmd_wrprotect(pmd); |
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pmd = pmd_mkclean(pmd); |
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set_pmd_at(args->mm, vaddr, args->pmdp, pmd); |
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flush_dcache_page(page); |
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pmd = pmd_mkwrite(pmd); |
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pmd = pmd_mkdirty(pmd); |
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pmdp_set_access_flags(args->vma, vaddr, args->pmdp, pmd, 1); |
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pmd = READ_ONCE(*args->pmdp); |
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WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); |
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pmdp_huge_get_and_clear_full(args->vma, vaddr, args->pmdp, 1); |
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pmd = READ_ONCE(*args->pmdp); |
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WARN_ON(!pmd_none(pmd)); |
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pmd = pmd_mkhuge(pfn_pmd(args->pmd_pfn, args->page_prot)); |
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pmd = pmd_mkyoung(pmd); |
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set_pmd_at(args->mm, vaddr, args->pmdp, pmd); |
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flush_dcache_page(page); |
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pmdp_test_and_clear_young(args->vma, vaddr, args->pmdp); |
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pmd = READ_ONCE(*args->pmdp); |
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WARN_ON(pmd_young(pmd)); |
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/* Clear the pte entries */ |
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pmdp_huge_get_and_clear(args->mm, vaddr, args->pmdp); |
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pgtable_trans_huge_withdraw(args->mm, args->pmdp); |
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} |
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static void __init pmd_leaf_tests(struct pgtable_debug_args *args) |
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{ |
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pmd_t pmd; |
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if (!has_transparent_hugepage()) |
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return; |
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pr_debug("Validating PMD leaf\n"); |
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pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
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/* |
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* PMD based THP is a leaf entry. |
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*/ |
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pmd = pmd_mkhuge(pmd); |
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WARN_ON(!pmd_leaf(pmd)); |
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} |
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static void __init pmd_savedwrite_tests(struct pgtable_debug_args *args) |
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{ |
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pmd_t pmd; |
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if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) |
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return; |
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if (!has_transparent_hugepage()) |
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return; |
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pr_debug("Validating PMD saved write\n"); |
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pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot_none); |
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WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd)))); |
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WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd)))); |
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} |
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
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static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx) |
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{ |
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pgprot_t prot = vm_get_page_prot(idx); |
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unsigned long val = idx, *ptr = &val; |
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pud_t pud; |
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if (!has_transparent_hugepage()) |
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return; |
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pr_debug("Validating PUD basic (%pGv)\n", ptr); |
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pud = pfn_pud(args->fixed_pud_pfn, prot); |
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/* |
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* This test needs to be executed after the given page table entry |
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* is created with pfn_pud() to make sure that vm_get_page_prot(idx) |
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* does not have the dirty bit enabled from the beginning. This is |
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* important for platforms like arm64 where (!PTE_RDONLY) indicate |
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* dirty bit being set. |
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*/ |
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WARN_ON(pud_dirty(pud_wrprotect(pud))); |
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WARN_ON(!pud_same(pud, pud)); |
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WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud)))); |
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WARN_ON(!pud_dirty(pud_mkdirty(pud_mkclean(pud)))); |
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WARN_ON(pud_dirty(pud_mkclean(pud_mkdirty(pud)))); |
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WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud)))); |
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WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud)))); |
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WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud)))); |
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WARN_ON(pud_dirty(pud_wrprotect(pud_mkclean(pud)))); |
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WARN_ON(!pud_dirty(pud_wrprotect(pud_mkdirty(pud)))); |
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if (mm_pmd_folded(args->mm)) |
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return; |
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/* |
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* A huge page does not point to next level page table |
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* entry. Hence this must qualify as pud_bad(). |
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*/ |
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WARN_ON(!pud_bad(pud_mkhuge(pud))); |
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} |
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static void __init pud_advanced_tests(struct pgtable_debug_args *args) |
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{ |
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struct page *page; |
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unsigned long vaddr = args->vaddr; |
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pud_t pud; |
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if (!has_transparent_hugepage()) |
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return; |
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page = (args->pud_pfn != ULONG_MAX) ? pfn_to_page(args->pud_pfn) : NULL; |
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if (!page) |
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return; |
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/* |
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* flush_dcache_page() is called after set_pud_at() to clear |
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* PG_arch_1 for the page on ARM64. The page flag isn't cleared |
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* when it's released and page allocation check will fail when |
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* the page is allocated again. For architectures other than ARM64, |
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* the unexpected overhead of cache flushing is acceptable. |
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*/ |
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pr_debug("Validating PUD advanced\n"); |
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/* Align the address wrt HPAGE_PUD_SIZE */ |
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vaddr &= HPAGE_PUD_MASK; |
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pud = pfn_pud(args->pud_pfn, args->page_prot); |
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set_pud_at(args->mm, vaddr, args->pudp, pud); |
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flush_dcache_page(page); |
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pudp_set_wrprotect(args->mm, vaddr, args->pudp); |
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pud = READ_ONCE(*args->pudp); |
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WARN_ON(pud_write(pud)); |
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#ifndef __PAGETABLE_PMD_FOLDED |
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pudp_huge_get_and_clear(args->mm, vaddr, args->pudp); |
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pud = READ_ONCE(*args->pudp); |
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WARN_ON(!pud_none(pud)); |
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#endif /* __PAGETABLE_PMD_FOLDED */ |
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pud = pfn_pud(args->pud_pfn, args->page_prot); |
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pud = pud_wrprotect(pud); |
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pud = pud_mkclean(pud); |
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set_pud_at(args->mm, vaddr, args->pudp, pud); |
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flush_dcache_page(page); |
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pud = pud_mkwrite(pud); |
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pud = pud_mkdirty(pud); |
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pudp_set_access_flags(args->vma, vaddr, args->pudp, pud, 1); |
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pud = READ_ONCE(*args->pudp); |
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WARN_ON(!(pud_write(pud) && pud_dirty(pud))); |
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#ifndef __PAGETABLE_PMD_FOLDED |
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pudp_huge_get_and_clear_full(args->mm, vaddr, args->pudp, 1); |
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pud = READ_ONCE(*args->pudp); |
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WARN_ON(!pud_none(pud)); |
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#endif /* __PAGETABLE_PMD_FOLDED */ |
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pud = pfn_pud(args->pud_pfn, args->page_prot); |
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pud = pud_mkyoung(pud); |
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set_pud_at(args->mm, vaddr, args->pudp, pud); |
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flush_dcache_page(page); |
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pudp_test_and_clear_young(args->vma, vaddr, args->pudp); |
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pud = READ_ONCE(*args->pudp); |
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WARN_ON(pud_young(pud)); |
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pudp_huge_get_and_clear(args->mm, vaddr, args->pudp); |
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} |
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static void __init pud_leaf_tests(struct pgtable_debug_args *args) |
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{ |
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pud_t pud; |
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|
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if (!has_transparent_hugepage()) |
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return; |
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|
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pr_debug("Validating PUD leaf\n"); |
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pud = pfn_pud(args->fixed_pud_pfn, args->page_prot); |
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/* |
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* PUD based THP is a leaf entry. |
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*/ |
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pud = pud_mkhuge(pud); |
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WARN_ON(!pud_leaf(pud)); |
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} |
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#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
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static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx) { } |
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static void __init pud_advanced_tests(struct pgtable_debug_args *args) { } |
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static void __init pud_leaf_tests(struct pgtable_debug_args *args) { } |
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#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
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#else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
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static void __init pmd_basic_tests(struct pgtable_debug_args *args, int idx) { } |
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static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx) { } |
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static void __init pmd_advanced_tests(struct pgtable_debug_args *args) { } |
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static void __init pud_advanced_tests(struct pgtable_debug_args *args) { } |
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static void __init pmd_leaf_tests(struct pgtable_debug_args *args) { } |
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static void __init pud_leaf_tests(struct pgtable_debug_args *args) { } |
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static void __init pmd_savedwrite_tests(struct pgtable_debug_args *args) { } |
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
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|
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#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP |
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static void __init pmd_huge_tests(struct pgtable_debug_args *args) |
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{ |
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pmd_t pmd; |
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|
|
if (!arch_vmap_pmd_supported(args->page_prot)) |
|
return; |
|
|
|
pr_debug("Validating PMD huge\n"); |
|
/* |
|
* X86 defined pmd_set_huge() verifies that the given |
|
* PMD is not a populated non-leaf entry. |
|
*/ |
|
WRITE_ONCE(*args->pmdp, __pmd(0)); |
|
WARN_ON(!pmd_set_huge(args->pmdp, __pfn_to_phys(args->fixed_pmd_pfn), args->page_prot)); |
|
WARN_ON(!pmd_clear_huge(args->pmdp)); |
|
pmd = READ_ONCE(*args->pmdp); |
|
WARN_ON(!pmd_none(pmd)); |
|
} |
|
|
|
static void __init pud_huge_tests(struct pgtable_debug_args *args) |
|
{ |
|
pud_t pud; |
|
|
|
if (!arch_vmap_pud_supported(args->page_prot)) |
|
return; |
|
|
|
pr_debug("Validating PUD huge\n"); |
|
/* |
|
* X86 defined pud_set_huge() verifies that the given |
|
* PUD is not a populated non-leaf entry. |
|
*/ |
|
WRITE_ONCE(*args->pudp, __pud(0)); |
|
WARN_ON(!pud_set_huge(args->pudp, __pfn_to_phys(args->fixed_pud_pfn), args->page_prot)); |
|
WARN_ON(!pud_clear_huge(args->pudp)); |
|
pud = READ_ONCE(*args->pudp); |
|
WARN_ON(!pud_none(pud)); |
|
} |
|
#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ |
|
static void __init pmd_huge_tests(struct pgtable_debug_args *args) { } |
|
static void __init pud_huge_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ |
|
|
|
static void __init p4d_basic_tests(struct pgtable_debug_args *args) |
|
{ |
|
p4d_t p4d; |
|
|
|
pr_debug("Validating P4D basic\n"); |
|
memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t)); |
|
WARN_ON(!p4d_same(p4d, p4d)); |
|
} |
|
|
|
static void __init pgd_basic_tests(struct pgtable_debug_args *args) |
|
{ |
|
pgd_t pgd; |
|
|
|
pr_debug("Validating PGD basic\n"); |
|
memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t)); |
|
WARN_ON(!pgd_same(pgd, pgd)); |
|
} |
|
|
|
#ifndef __PAGETABLE_PUD_FOLDED |
|
static void __init pud_clear_tests(struct pgtable_debug_args *args) |
|
{ |
|
pud_t pud = READ_ONCE(*args->pudp); |
|
|
|
if (mm_pmd_folded(args->mm)) |
|
return; |
|
|
|
pr_debug("Validating PUD clear\n"); |
|
pud = __pud(pud_val(pud) | RANDOM_ORVALUE); |
|
WRITE_ONCE(*args->pudp, pud); |
|
pud_clear(args->pudp); |
|
pud = READ_ONCE(*args->pudp); |
|
WARN_ON(!pud_none(pud)); |
|
} |
|
|
|
static void __init pud_populate_tests(struct pgtable_debug_args *args) |
|
{ |
|
pud_t pud; |
|
|
|
if (mm_pmd_folded(args->mm)) |
|
return; |
|
|
|
pr_debug("Validating PUD populate\n"); |
|
/* |
|
* This entry points to next level page table page. |
|
* Hence this must not qualify as pud_bad(). |
|
*/ |
|
pud_populate(args->mm, args->pudp, args->start_pmdp); |
|
pud = READ_ONCE(*args->pudp); |
|
WARN_ON(pud_bad(pud)); |
|
} |
|
#else /* !__PAGETABLE_PUD_FOLDED */ |
|
static void __init pud_clear_tests(struct pgtable_debug_args *args) { } |
|
static void __init pud_populate_tests(struct pgtable_debug_args *args) { } |
|
#endif /* PAGETABLE_PUD_FOLDED */ |
|
|
|
#ifndef __PAGETABLE_P4D_FOLDED |
|
static void __init p4d_clear_tests(struct pgtable_debug_args *args) |
|
{ |
|
p4d_t p4d = READ_ONCE(*args->p4dp); |
|
|
|
if (mm_pud_folded(args->mm)) |
|
return; |
|
|
|
pr_debug("Validating P4D clear\n"); |
|
p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE); |
|
WRITE_ONCE(*args->p4dp, p4d); |
|
p4d_clear(args->p4dp); |
|
p4d = READ_ONCE(*args->p4dp); |
|
WARN_ON(!p4d_none(p4d)); |
|
} |
|
|
|
static void __init p4d_populate_tests(struct pgtable_debug_args *args) |
|
{ |
|
p4d_t p4d; |
|
|
|
if (mm_pud_folded(args->mm)) |
|
return; |
|
|
|
pr_debug("Validating P4D populate\n"); |
|
/* |
|
* This entry points to next level page table page. |
|
* Hence this must not qualify as p4d_bad(). |
|
*/ |
|
pud_clear(args->pudp); |
|
p4d_clear(args->p4dp); |
|
p4d_populate(args->mm, args->p4dp, args->start_pudp); |
|
p4d = READ_ONCE(*args->p4dp); |
|
WARN_ON(p4d_bad(p4d)); |
|
} |
|
|
|
static void __init pgd_clear_tests(struct pgtable_debug_args *args) |
|
{ |
|
pgd_t pgd = READ_ONCE(*(args->pgdp)); |
|
|
|
if (mm_p4d_folded(args->mm)) |
|
return; |
|
|
|
pr_debug("Validating PGD clear\n"); |
|
pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE); |
|
WRITE_ONCE(*args->pgdp, pgd); |
|
pgd_clear(args->pgdp); |
|
pgd = READ_ONCE(*args->pgdp); |
|
WARN_ON(!pgd_none(pgd)); |
|
} |
|
|
|
static void __init pgd_populate_tests(struct pgtable_debug_args *args) |
|
{ |
|
pgd_t pgd; |
|
|
|
if (mm_p4d_folded(args->mm)) |
|
return; |
|
|
|
pr_debug("Validating PGD populate\n"); |
|
/* |
|
* This entry points to next level page table page. |
|
* Hence this must not qualify as pgd_bad(). |
|
*/ |
|
p4d_clear(args->p4dp); |
|
pgd_clear(args->pgdp); |
|
pgd_populate(args->mm, args->pgdp, args->start_p4dp); |
|
pgd = READ_ONCE(*args->pgdp); |
|
WARN_ON(pgd_bad(pgd)); |
|
} |
|
#else /* !__PAGETABLE_P4D_FOLDED */ |
|
static void __init p4d_clear_tests(struct pgtable_debug_args *args) { } |
|
static void __init pgd_clear_tests(struct pgtable_debug_args *args) { } |
|
static void __init p4d_populate_tests(struct pgtable_debug_args *args) { } |
|
static void __init pgd_populate_tests(struct pgtable_debug_args *args) { } |
|
#endif /* PAGETABLE_P4D_FOLDED */ |
|
|
|
static void __init pte_clear_tests(struct pgtable_debug_args *args) |
|
{ |
|
struct page *page; |
|
pte_t pte = pfn_pte(args->pte_pfn, args->page_prot); |
|
|
|
page = (args->pte_pfn != ULONG_MAX) ? pfn_to_page(args->pte_pfn) : NULL; |
|
if (!page) |
|
return; |
|
|
|
/* |
|
* flush_dcache_page() is called after set_pte_at() to clear |
|
* PG_arch_1 for the page on ARM64. The page flag isn't cleared |
|
* when it's released and page allocation check will fail when |
|
* the page is allocated again. For architectures other than ARM64, |
|
* the unexpected overhead of cache flushing is acceptable. |
|
*/ |
|
pr_debug("Validating PTE clear\n"); |
|
#ifndef CONFIG_RISCV |
|
pte = __pte(pte_val(pte) | RANDOM_ORVALUE); |
|
#endif |
|
set_pte_at(args->mm, args->vaddr, args->ptep, pte); |
|
flush_dcache_page(page); |
|
barrier(); |
|
ptep_clear(args->mm, args->vaddr, args->ptep); |
|
pte = ptep_get(args->ptep); |
|
WARN_ON(!pte_none(pte)); |
|
} |
|
|
|
static void __init pmd_clear_tests(struct pgtable_debug_args *args) |
|
{ |
|
pmd_t pmd = READ_ONCE(*args->pmdp); |
|
|
|
pr_debug("Validating PMD clear\n"); |
|
pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE); |
|
WRITE_ONCE(*args->pmdp, pmd); |
|
pmd_clear(args->pmdp); |
|
pmd = READ_ONCE(*args->pmdp); |
|
WARN_ON(!pmd_none(pmd)); |
|
} |
|
|
|
static void __init pmd_populate_tests(struct pgtable_debug_args *args) |
|
{ |
|
pmd_t pmd; |
|
|
|
pr_debug("Validating PMD populate\n"); |
|
/* |
|
* This entry points to next level page table page. |
|
* Hence this must not qualify as pmd_bad(). |
|
*/ |
|
pmd_populate(args->mm, args->pmdp, args->start_ptep); |
|
pmd = READ_ONCE(*args->pmdp); |
|
WARN_ON(pmd_bad(pmd)); |
|
} |
|
|
|
static void __init pte_special_tests(struct pgtable_debug_args *args) |
|
{ |
|
pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
|
|
|
if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL)) |
|
return; |
|
|
|
pr_debug("Validating PTE special\n"); |
|
WARN_ON(!pte_special(pte_mkspecial(pte))); |
|
} |
|
|
|
static void __init pte_protnone_tests(struct pgtable_debug_args *args) |
|
{ |
|
pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot_none); |
|
|
|
if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) |
|
return; |
|
|
|
pr_debug("Validating PTE protnone\n"); |
|
WARN_ON(!pte_protnone(pte)); |
|
WARN_ON(!pte_present(pte)); |
|
} |
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
static void __init pmd_protnone_tests(struct pgtable_debug_args *args) |
|
{ |
|
pmd_t pmd; |
|
|
|
if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) |
|
return; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PMD protnone\n"); |
|
pmd = pmd_mkhuge(pfn_pmd(args->fixed_pmd_pfn, args->page_prot_none)); |
|
WARN_ON(!pmd_protnone(pmd)); |
|
WARN_ON(!pmd_present(pmd)); |
|
} |
|
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
|
static void __init pmd_protnone_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
|
#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP |
|
static void __init pte_devmap_tests(struct pgtable_debug_args *args) |
|
{ |
|
pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
|
|
|
pr_debug("Validating PTE devmap\n"); |
|
WARN_ON(!pte_devmap(pte_mkdevmap(pte))); |
|
} |
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
static void __init pmd_devmap_tests(struct pgtable_debug_args *args) |
|
{ |
|
pmd_t pmd; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PMD devmap\n"); |
|
pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
|
WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd))); |
|
} |
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
|
static void __init pud_devmap_tests(struct pgtable_debug_args *args) |
|
{ |
|
pud_t pud; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PUD devmap\n"); |
|
pud = pfn_pud(args->fixed_pud_pfn, args->page_prot); |
|
WARN_ON(!pud_devmap(pud_mkdevmap(pud))); |
|
} |
|
#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
|
static void __init pud_devmap_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
|
#else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
static void __init pmd_devmap_tests(struct pgtable_debug_args *args) { } |
|
static void __init pud_devmap_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
#else |
|
static void __init pte_devmap_tests(struct pgtable_debug_args *args) { } |
|
static void __init pmd_devmap_tests(struct pgtable_debug_args *args) { } |
|
static void __init pud_devmap_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ |
|
|
|
static void __init pte_soft_dirty_tests(struct pgtable_debug_args *args) |
|
{ |
|
pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
|
|
|
if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) |
|
return; |
|
|
|
pr_debug("Validating PTE soft dirty\n"); |
|
WARN_ON(!pte_soft_dirty(pte_mksoft_dirty(pte))); |
|
WARN_ON(pte_soft_dirty(pte_clear_soft_dirty(pte))); |
|
} |
|
|
|
static void __init pte_swap_soft_dirty_tests(struct pgtable_debug_args *args) |
|
{ |
|
pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
|
|
|
if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) |
|
return; |
|
|
|
pr_debug("Validating PTE swap soft dirty\n"); |
|
WARN_ON(!pte_swp_soft_dirty(pte_swp_mksoft_dirty(pte))); |
|
WARN_ON(pte_swp_soft_dirty(pte_swp_clear_soft_dirty(pte))); |
|
} |
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
static void __init pmd_soft_dirty_tests(struct pgtable_debug_args *args) |
|
{ |
|
pmd_t pmd; |
|
|
|
if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) |
|
return; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PMD soft dirty\n"); |
|
pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
|
WARN_ON(!pmd_soft_dirty(pmd_mksoft_dirty(pmd))); |
|
WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd))); |
|
} |
|
|
|
static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) |
|
{ |
|
pmd_t pmd; |
|
|
|
if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) || |
|
!IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION)) |
|
return; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PMD swap soft dirty\n"); |
|
pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
|
WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd))); |
|
WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd))); |
|
} |
|
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
|
static void __init pmd_soft_dirty_tests(struct pgtable_debug_args *args) { } |
|
static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
|
static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args) |
|
{ |
|
#ifdef __HAVE_ARCH_PTE_SWP_EXCLUSIVE |
|
pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
|
|
|
pr_debug("Validating PTE swap exclusive\n"); |
|
pte = pte_swp_mkexclusive(pte); |
|
WARN_ON(!pte_swp_exclusive(pte)); |
|
pte = pte_swp_clear_exclusive(pte); |
|
WARN_ON(pte_swp_exclusive(pte)); |
|
#endif /* __HAVE_ARCH_PTE_SWP_EXCLUSIVE */ |
|
} |
|
|
|
static void __init pte_swap_tests(struct pgtable_debug_args *args) |
|
{ |
|
swp_entry_t swp; |
|
pte_t pte; |
|
|
|
pr_debug("Validating PTE swap\n"); |
|
pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
|
swp = __pte_to_swp_entry(pte); |
|
pte = __swp_entry_to_pte(swp); |
|
WARN_ON(args->fixed_pte_pfn != pte_pfn(pte)); |
|
} |
|
|
|
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
|
static void __init pmd_swap_tests(struct pgtable_debug_args *args) |
|
{ |
|
swp_entry_t swp; |
|
pmd_t pmd; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PMD swap\n"); |
|
pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
|
swp = __pmd_to_swp_entry(pmd); |
|
pmd = __swp_entry_to_pmd(swp); |
|
WARN_ON(args->fixed_pmd_pfn != pmd_pfn(pmd)); |
|
} |
|
#else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */ |
|
static void __init pmd_swap_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ |
|
|
|
static void __init swap_migration_tests(struct pgtable_debug_args *args) |
|
{ |
|
struct page *page; |
|
swp_entry_t swp; |
|
|
|
if (!IS_ENABLED(CONFIG_MIGRATION)) |
|
return; |
|
|
|
/* |
|
* swap_migration_tests() requires a dedicated page as it needs to |
|
* be locked before creating a migration entry from it. Locking the |
|
* page that actually maps kernel text ('start_kernel') can be real |
|
* problematic. Lets use the allocated page explicitly for this |
|
* purpose. |
|
*/ |
|
page = (args->pte_pfn != ULONG_MAX) ? pfn_to_page(args->pte_pfn) : NULL; |
|
if (!page) |
|
return; |
|
|
|
pr_debug("Validating swap migration\n"); |
|
|
|
/* |
|
* make_[readable|writable]_migration_entry() expects given page to |
|
* be locked, otherwise it stumbles upon a BUG_ON(). |
|
*/ |
|
__SetPageLocked(page); |
|
swp = make_writable_migration_entry(page_to_pfn(page)); |
|
WARN_ON(!is_migration_entry(swp)); |
|
WARN_ON(!is_writable_migration_entry(swp)); |
|
|
|
swp = make_readable_migration_entry(swp_offset(swp)); |
|
WARN_ON(!is_migration_entry(swp)); |
|
WARN_ON(is_writable_migration_entry(swp)); |
|
|
|
swp = make_readable_migration_entry(page_to_pfn(page)); |
|
WARN_ON(!is_migration_entry(swp)); |
|
WARN_ON(is_writable_migration_entry(swp)); |
|
__ClearPageLocked(page); |
|
} |
|
|
|
#ifdef CONFIG_HUGETLB_PAGE |
|
static void __init hugetlb_basic_tests(struct pgtable_debug_args *args) |
|
{ |
|
struct page *page; |
|
pte_t pte; |
|
|
|
pr_debug("Validating HugeTLB basic\n"); |
|
/* |
|
* Accessing the page associated with the pfn is safe here, |
|
* as it was previously derived from a real kernel symbol. |
|
*/ |
|
page = pfn_to_page(args->fixed_pmd_pfn); |
|
pte = mk_huge_pte(page, args->page_prot); |
|
|
|
WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte))); |
|
WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte)))); |
|
WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte)))); |
|
|
|
#ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB |
|
pte = pfn_pte(args->fixed_pmd_pfn, args->page_prot); |
|
|
|
WARN_ON(!pte_huge(pte_mkhuge(pte))); |
|
#endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ |
|
} |
|
#else /* !CONFIG_HUGETLB_PAGE */ |
|
static void __init hugetlb_basic_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_HUGETLB_PAGE */ |
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
static void __init pmd_thp_tests(struct pgtable_debug_args *args) |
|
{ |
|
pmd_t pmd; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PMD based THP\n"); |
|
/* |
|
* pmd_trans_huge() and pmd_present() must return positive after |
|
* MMU invalidation with pmd_mkinvalid(). This behavior is an |
|
* optimization for transparent huge page. pmd_trans_huge() must |
|
* be true if pmd_page() returns a valid THP to avoid taking the |
|
* pmd_lock when others walk over non transhuge pmds (i.e. there |
|
* are no THP allocated). Especially when splitting a THP and |
|
* removing the present bit from the pmd, pmd_trans_huge() still |
|
* needs to return true. pmd_present() should be true whenever |
|
* pmd_trans_huge() returns true. |
|
*/ |
|
pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
|
WARN_ON(!pmd_trans_huge(pmd_mkhuge(pmd))); |
|
|
|
#ifndef __HAVE_ARCH_PMDP_INVALIDATE |
|
WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd)))); |
|
WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd)))); |
|
#endif /* __HAVE_ARCH_PMDP_INVALIDATE */ |
|
} |
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
|
static void __init pud_thp_tests(struct pgtable_debug_args *args) |
|
{ |
|
pud_t pud; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PUD based THP\n"); |
|
pud = pfn_pud(args->fixed_pud_pfn, args->page_prot); |
|
WARN_ON(!pud_trans_huge(pud_mkhuge(pud))); |
|
|
|
/* |
|
* pud_mkinvalid() has been dropped for now. Enable back |
|
* these tests when it comes back with a modified pud_present(). |
|
* |
|
* WARN_ON(!pud_trans_huge(pud_mkinvalid(pud_mkhuge(pud)))); |
|
* WARN_ON(!pud_present(pud_mkinvalid(pud_mkhuge(pud)))); |
|
*/ |
|
} |
|
#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
|
static void __init pud_thp_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
|
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
|
static void __init pmd_thp_tests(struct pgtable_debug_args *args) { } |
|
static void __init pud_thp_tests(struct pgtable_debug_args *args) { } |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
|
static unsigned long __init get_random_vaddr(void) |
|
{ |
|
unsigned long random_vaddr, random_pages, total_user_pages; |
|
|
|
total_user_pages = (TASK_SIZE - FIRST_USER_ADDRESS) / PAGE_SIZE; |
|
|
|
random_pages = get_random_long() % total_user_pages; |
|
random_vaddr = FIRST_USER_ADDRESS + random_pages * PAGE_SIZE; |
|
|
|
return random_vaddr; |
|
} |
|
|
|
static void __init destroy_args(struct pgtable_debug_args *args) |
|
{ |
|
struct page *page = NULL; |
|
|
|
/* Free (huge) page */ |
|
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && |
|
IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) && |
|
has_transparent_hugepage() && |
|
args->pud_pfn != ULONG_MAX) { |
|
if (args->is_contiguous_page) { |
|
free_contig_range(args->pud_pfn, |
|
(1 << (HPAGE_PUD_SHIFT - PAGE_SHIFT))); |
|
} else { |
|
page = pfn_to_page(args->pud_pfn); |
|
__free_pages(page, HPAGE_PUD_SHIFT - PAGE_SHIFT); |
|
} |
|
|
|
args->pud_pfn = ULONG_MAX; |
|
args->pmd_pfn = ULONG_MAX; |
|
args->pte_pfn = ULONG_MAX; |
|
} |
|
|
|
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && |
|
has_transparent_hugepage() && |
|
args->pmd_pfn != ULONG_MAX) { |
|
if (args->is_contiguous_page) { |
|
free_contig_range(args->pmd_pfn, (1 << HPAGE_PMD_ORDER)); |
|
} else { |
|
page = pfn_to_page(args->pmd_pfn); |
|
__free_pages(page, HPAGE_PMD_ORDER); |
|
} |
|
|
|
args->pmd_pfn = ULONG_MAX; |
|
args->pte_pfn = ULONG_MAX; |
|
} |
|
|
|
if (args->pte_pfn != ULONG_MAX) { |
|
page = pfn_to_page(args->pte_pfn); |
|
__free_pages(page, 0); |
|
|
|
args->pte_pfn = ULONG_MAX; |
|
} |
|
|
|
/* Free page table entries */ |
|
if (args->start_ptep) { |
|
pte_free(args->mm, args->start_ptep); |
|
mm_dec_nr_ptes(args->mm); |
|
} |
|
|
|
if (args->start_pmdp) { |
|
pmd_free(args->mm, args->start_pmdp); |
|
mm_dec_nr_pmds(args->mm); |
|
} |
|
|
|
if (args->start_pudp) { |
|
pud_free(args->mm, args->start_pudp); |
|
mm_dec_nr_puds(args->mm); |
|
} |
|
|
|
if (args->start_p4dp) |
|
p4d_free(args->mm, args->start_p4dp); |
|
|
|
/* Free vma and mm struct */ |
|
if (args->vma) |
|
vm_area_free(args->vma); |
|
|
|
if (args->mm) |
|
mmdrop(args->mm); |
|
} |
|
|
|
static struct page * __init |
|
debug_vm_pgtable_alloc_huge_page(struct pgtable_debug_args *args, int order) |
|
{ |
|
struct page *page = NULL; |
|
|
|
#ifdef CONFIG_CONTIG_ALLOC |
|
if (order >= MAX_ORDER) { |
|
page = alloc_contig_pages((1 << order), GFP_KERNEL, |
|
first_online_node, NULL); |
|
if (page) { |
|
args->is_contiguous_page = true; |
|
return page; |
|
} |
|
} |
|
#endif |
|
|
|
if (order < MAX_ORDER) |
|
page = alloc_pages(GFP_KERNEL, order); |
|
|
|
return page; |
|
} |
|
|
|
static int __init init_args(struct pgtable_debug_args *args) |
|
{ |
|
struct page *page = NULL; |
|
phys_addr_t phys; |
|
int ret = 0; |
|
|
|
/* |
|
* Initialize the debugging data. |
|
* |
|
* vm_get_page_prot(VM_NONE) or vm_get_page_prot(VM_SHARED|VM_NONE) |
|
* will help create page table entries with PROT_NONE permission as |
|
* required for pxx_protnone_tests(). |
|
*/ |
|
memset(args, 0, sizeof(*args)); |
|
args->vaddr = get_random_vaddr(); |
|
args->page_prot = vm_get_page_prot(VMFLAGS); |
|
args->page_prot_none = vm_get_page_prot(VM_NONE); |
|
args->is_contiguous_page = false; |
|
args->pud_pfn = ULONG_MAX; |
|
args->pmd_pfn = ULONG_MAX; |
|
args->pte_pfn = ULONG_MAX; |
|
args->fixed_pgd_pfn = ULONG_MAX; |
|
args->fixed_p4d_pfn = ULONG_MAX; |
|
args->fixed_pud_pfn = ULONG_MAX; |
|
args->fixed_pmd_pfn = ULONG_MAX; |
|
args->fixed_pte_pfn = ULONG_MAX; |
|
|
|
/* Allocate mm and vma */ |
|
args->mm = mm_alloc(); |
|
if (!args->mm) { |
|
pr_err("Failed to allocate mm struct\n"); |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
|
|
args->vma = vm_area_alloc(args->mm); |
|
if (!args->vma) { |
|
pr_err("Failed to allocate vma\n"); |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
|
|
/* |
|
* Allocate page table entries. They will be modified in the tests. |
|
* Lets save the page table entries so that they can be released |
|
* when the tests are completed. |
|
*/ |
|
args->pgdp = pgd_offset(args->mm, args->vaddr); |
|
args->p4dp = p4d_alloc(args->mm, args->pgdp, args->vaddr); |
|
if (!args->p4dp) { |
|
pr_err("Failed to allocate p4d entries\n"); |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
args->start_p4dp = p4d_offset(args->pgdp, 0UL); |
|
WARN_ON(!args->start_p4dp); |
|
|
|
args->pudp = pud_alloc(args->mm, args->p4dp, args->vaddr); |
|
if (!args->pudp) { |
|
pr_err("Failed to allocate pud entries\n"); |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
args->start_pudp = pud_offset(args->p4dp, 0UL); |
|
WARN_ON(!args->start_pudp); |
|
|
|
args->pmdp = pmd_alloc(args->mm, args->pudp, args->vaddr); |
|
if (!args->pmdp) { |
|
pr_err("Failed to allocate pmd entries\n"); |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
args->start_pmdp = pmd_offset(args->pudp, 0UL); |
|
WARN_ON(!args->start_pmdp); |
|
|
|
if (pte_alloc(args->mm, args->pmdp)) { |
|
pr_err("Failed to allocate pte entries\n"); |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
args->start_ptep = pmd_pgtable(READ_ONCE(*args->pmdp)); |
|
WARN_ON(!args->start_ptep); |
|
|
|
/* |
|
* PFN for mapping at PTE level is determined from a standard kernel |
|
* text symbol. But pfns for higher page table levels are derived by |
|
* masking lower bits of this real pfn. These derived pfns might not |
|
* exist on the platform but that does not really matter as pfn_pxx() |
|
* helpers will still create appropriate entries for the test. This |
|
* helps avoid large memory block allocations to be used for mapping |
|
* at higher page table levels in some of the tests. |
|
*/ |
|
phys = __pa_symbol(&start_kernel); |
|
args->fixed_pgd_pfn = __phys_to_pfn(phys & PGDIR_MASK); |
|
args->fixed_p4d_pfn = __phys_to_pfn(phys & P4D_MASK); |
|
args->fixed_pud_pfn = __phys_to_pfn(phys & PUD_MASK); |
|
args->fixed_pmd_pfn = __phys_to_pfn(phys & PMD_MASK); |
|
args->fixed_pte_pfn = __phys_to_pfn(phys & PAGE_MASK); |
|
WARN_ON(!pfn_valid(args->fixed_pte_pfn)); |
|
|
|
/* |
|
* Allocate (huge) pages because some of the tests need to access |
|
* the data in the pages. The corresponding tests will be skipped |
|
* if we fail to allocate (huge) pages. |
|
*/ |
|
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && |
|
IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) && |
|
has_transparent_hugepage()) { |
|
page = debug_vm_pgtable_alloc_huge_page(args, |
|
HPAGE_PUD_SHIFT - PAGE_SHIFT); |
|
if (page) { |
|
args->pud_pfn = page_to_pfn(page); |
|
args->pmd_pfn = args->pud_pfn; |
|
args->pte_pfn = args->pud_pfn; |
|
return 0; |
|
} |
|
} |
|
|
|
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && |
|
has_transparent_hugepage()) { |
|
page = debug_vm_pgtable_alloc_huge_page(args, HPAGE_PMD_ORDER); |
|
if (page) { |
|
args->pmd_pfn = page_to_pfn(page); |
|
args->pte_pfn = args->pmd_pfn; |
|
return 0; |
|
} |
|
} |
|
|
|
page = alloc_pages(GFP_KERNEL, 0); |
|
if (page) |
|
args->pte_pfn = page_to_pfn(page); |
|
|
|
return 0; |
|
|
|
error: |
|
destroy_args(args); |
|
return ret; |
|
} |
|
|
|
static int __init debug_vm_pgtable(void) |
|
{ |
|
struct pgtable_debug_args args; |
|
spinlock_t *ptl = NULL; |
|
int idx, ret; |
|
|
|
pr_info("Validating architecture page table helpers\n"); |
|
ret = init_args(&args); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* Iterate over each possible vm_flags to make sure that all |
|
* the basic page table transformation validations just hold |
|
* true irrespective of the starting protection value for a |
|
* given page table entry. |
|
* |
|
* Protection based vm_flags combinatins are always linear |
|
* and increasing i.e starting from VM_NONE and going upto |
|
* (VM_SHARED | READ | WRITE | EXEC). |
|
*/ |
|
#define VM_FLAGS_START (VM_NONE) |
|
#define VM_FLAGS_END (VM_SHARED | VM_EXEC | VM_WRITE | VM_READ) |
|
|
|
for (idx = VM_FLAGS_START; idx <= VM_FLAGS_END; idx++) { |
|
pte_basic_tests(&args, idx); |
|
pmd_basic_tests(&args, idx); |
|
pud_basic_tests(&args, idx); |
|
} |
|
|
|
/* |
|
* Both P4D and PGD level tests are very basic which do not |
|
* involve creating page table entries from the protection |
|
* value and the given pfn. Hence just keep them out from |
|
* the above iteration for now to save some test execution |
|
* time. |
|
*/ |
|
p4d_basic_tests(&args); |
|
pgd_basic_tests(&args); |
|
|
|
pmd_leaf_tests(&args); |
|
pud_leaf_tests(&args); |
|
|
|
pte_savedwrite_tests(&args); |
|
pmd_savedwrite_tests(&args); |
|
|
|
pte_special_tests(&args); |
|
pte_protnone_tests(&args); |
|
pmd_protnone_tests(&args); |
|
|
|
pte_devmap_tests(&args); |
|
pmd_devmap_tests(&args); |
|
pud_devmap_tests(&args); |
|
|
|
pte_soft_dirty_tests(&args); |
|
pmd_soft_dirty_tests(&args); |
|
pte_swap_soft_dirty_tests(&args); |
|
pmd_swap_soft_dirty_tests(&args); |
|
|
|
pte_swap_exclusive_tests(&args); |
|
|
|
pte_swap_tests(&args); |
|
pmd_swap_tests(&args); |
|
|
|
swap_migration_tests(&args); |
|
|
|
pmd_thp_tests(&args); |
|
pud_thp_tests(&args); |
|
|
|
hugetlb_basic_tests(&args); |
|
|
|
/* |
|
* Page table modifying tests. They need to hold |
|
* proper page table lock. |
|
*/ |
|
|
|
args.ptep = pte_offset_map_lock(args.mm, args.pmdp, args.vaddr, &ptl); |
|
pte_clear_tests(&args); |
|
pte_advanced_tests(&args); |
|
pte_unmap_unlock(args.ptep, ptl); |
|
|
|
ptl = pmd_lock(args.mm, args.pmdp); |
|
pmd_clear_tests(&args); |
|
pmd_advanced_tests(&args); |
|
pmd_huge_tests(&args); |
|
pmd_populate_tests(&args); |
|
spin_unlock(ptl); |
|
|
|
ptl = pud_lock(args.mm, args.pudp); |
|
pud_clear_tests(&args); |
|
pud_advanced_tests(&args); |
|
pud_huge_tests(&args); |
|
pud_populate_tests(&args); |
|
spin_unlock(ptl); |
|
|
|
spin_lock(&(args.mm->page_table_lock)); |
|
p4d_clear_tests(&args); |
|
pgd_clear_tests(&args); |
|
p4d_populate_tests(&args); |
|
pgd_populate_tests(&args); |
|
spin_unlock(&(args.mm->page_table_lock)); |
|
|
|
destroy_args(&args); |
|
return 0; |
|
} |
|
late_initcall(debug_vm_pgtable);
|
|
|