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1132 lines
31 KiB
1132 lines
31 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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|
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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/pgalloc.h> |
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#include <asm/tlbflush.h> |
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|
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/* |
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* Please refer Documentation/vm/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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|
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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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|
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static void __init pte_basic_tests(unsigned long pfn, int idx) |
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{ |
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pgprot_t prot = protection_map[idx]; |
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pte_t pte = pfn_pte(pfn, prot); |
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unsigned long val = idx, *ptr = &val; |
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|
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pr_debug("Validating PTE basic (%pGv)\n", ptr); |
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|
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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 protection_map[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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|
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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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|
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static void __init pte_advanced_tests(struct mm_struct *mm, |
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struct vm_area_struct *vma, pte_t *ptep, |
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unsigned long pfn, unsigned long vaddr, |
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pgprot_t prot) |
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{ |
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pte_t pte; |
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|
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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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|
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pr_debug("Validating PTE advanced\n"); |
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pte = pfn_pte(pfn, prot); |
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set_pte_at(mm, vaddr, ptep, pte); |
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ptep_set_wrprotect(mm, vaddr, ptep); |
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pte = ptep_get(ptep); |
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WARN_ON(pte_write(pte)); |
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ptep_get_and_clear(mm, vaddr, ptep); |
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pte = ptep_get(ptep); |
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WARN_ON(!pte_none(pte)); |
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|
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pte = pfn_pte(pfn, prot); |
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pte = pte_wrprotect(pte); |
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pte = pte_mkclean(pte); |
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set_pte_at(mm, vaddr, ptep, pte); |
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pte = pte_mkwrite(pte); |
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pte = pte_mkdirty(pte); |
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ptep_set_access_flags(vma, vaddr, ptep, pte, 1); |
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pte = ptep_get(ptep); |
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WARN_ON(!(pte_write(pte) && pte_dirty(pte))); |
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ptep_get_and_clear_full(mm, vaddr, ptep, 1); |
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pte = ptep_get(ptep); |
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WARN_ON(!pte_none(pte)); |
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|
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pte = pfn_pte(pfn, prot); |
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pte = pte_mkyoung(pte); |
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set_pte_at(mm, vaddr, ptep, pte); |
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ptep_test_and_clear_young(vma, vaddr, ptep); |
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pte = ptep_get(ptep); |
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WARN_ON(pte_young(pte)); |
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} |
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static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot) |
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{ |
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pte_t pte = pfn_pte(pfn, prot); |
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|
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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(unsigned long pfn, int idx) |
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{ |
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pgprot_t prot = protection_map[idx]; |
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unsigned long val = idx, *ptr = &val; |
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pmd_t pmd; |
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|
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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(pfn, prot); |
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|
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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 protection_map[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 mm_struct *mm, |
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struct vm_area_struct *vma, pmd_t *pmdp, |
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unsigned long pfn, unsigned long vaddr, |
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pgprot_t prot, pgtable_t pgtable) |
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{ |
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pmd_t pmd; |
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|
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if (!has_transparent_hugepage()) |
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return; |
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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(mm, pmdp, pgtable); |
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pmd = pfn_pmd(pfn, prot); |
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set_pmd_at(mm, vaddr, pmdp, pmd); |
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pmdp_set_wrprotect(mm, vaddr, pmdp); |
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pmd = READ_ONCE(*pmdp); |
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WARN_ON(pmd_write(pmd)); |
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pmdp_huge_get_and_clear(mm, vaddr, pmdp); |
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pmd = READ_ONCE(*pmdp); |
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WARN_ON(!pmd_none(pmd)); |
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pmd = pfn_pmd(pfn, prot); |
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pmd = pmd_wrprotect(pmd); |
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pmd = pmd_mkclean(pmd); |
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set_pmd_at(mm, vaddr, pmdp, pmd); |
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pmd = pmd_mkwrite(pmd); |
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pmd = pmd_mkdirty(pmd); |
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pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1); |
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pmd = READ_ONCE(*pmdp); |
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WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); |
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pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1); |
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pmd = READ_ONCE(*pmdp); |
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WARN_ON(!pmd_none(pmd)); |
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pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); |
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pmd = pmd_mkyoung(pmd); |
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set_pmd_at(mm, vaddr, pmdp, pmd); |
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pmdp_test_and_clear_young(vma, vaddr, pmdp); |
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pmd = READ_ONCE(*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(mm, vaddr, pmdp); |
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pgtable = pgtable_trans_huge_withdraw(mm, pmdp); |
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} |
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static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) |
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{ |
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pmd_t pmd; |
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|
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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(pfn, 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(unsigned long pfn, pgprot_t prot) |
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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(pfn, prot); |
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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 mm_struct *mm, unsigned long pfn, int idx) |
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{ |
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pgprot_t prot = protection_map[idx]; |
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unsigned long val = idx, *ptr = &val; |
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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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pr_debug("Validating PUD basic (%pGv)\n", ptr); |
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pud = pfn_pud(pfn, prot); |
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|
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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 protection_map[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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|
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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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|
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if (mm_pmd_folded(mm)) |
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return; |
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|
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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 mm_struct *mm, |
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struct vm_area_struct *vma, pud_t *pudp, |
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unsigned long pfn, unsigned long vaddr, |
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pgprot_t prot) |
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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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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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|
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pud = pfn_pud(pfn, prot); |
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set_pud_at(mm, vaddr, pudp, pud); |
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pudp_set_wrprotect(mm, vaddr, pudp); |
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pud = READ_ONCE(*pudp); |
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WARN_ON(pud_write(pud)); |
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|
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#ifndef __PAGETABLE_PMD_FOLDED |
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pudp_huge_get_and_clear(mm, vaddr, pudp); |
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pud = READ_ONCE(*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(pfn, prot); |
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pud = pud_wrprotect(pud); |
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pud = pud_mkclean(pud); |
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set_pud_at(mm, vaddr, pudp, pud); |
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pud = pud_mkwrite(pud); |
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pud = pud_mkdirty(pud); |
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pudp_set_access_flags(vma, vaddr, pudp, pud, 1); |
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pud = READ_ONCE(*pudp); |
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WARN_ON(!(pud_write(pud) && pud_dirty(pud))); |
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|
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#ifndef __PAGETABLE_PMD_FOLDED |
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pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1); |
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pud = READ_ONCE(*pudp); |
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WARN_ON(!pud_none(pud)); |
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#endif /* __PAGETABLE_PMD_FOLDED */ |
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|
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pud = pfn_pud(pfn, prot); |
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pud = pud_mkyoung(pud); |
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set_pud_at(mm, vaddr, pudp, pud); |
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pudp_test_and_clear_young(vma, vaddr, pudp); |
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pud = READ_ONCE(*pudp); |
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WARN_ON(pud_young(pud)); |
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|
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pudp_huge_get_and_clear(mm, vaddr, pudp); |
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} |
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static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) |
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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(pfn, 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 mm_struct *mm, unsigned long pfn, int idx) { } |
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static void __init pud_advanced_tests(struct mm_struct *mm, |
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struct vm_area_struct *vma, pud_t *pudp, |
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unsigned long pfn, unsigned long vaddr, |
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pgprot_t prot) |
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{ |
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} |
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static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } |
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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(unsigned long pfn, int idx) { } |
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static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { } |
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static void __init pmd_advanced_tests(struct mm_struct *mm, |
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struct vm_area_struct *vma, pmd_t *pmdp, |
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unsigned long pfn, unsigned long vaddr, |
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pgprot_t prot, pgtable_t pgtable) |
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{ |
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} |
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static void __init pud_advanced_tests(struct mm_struct *mm, |
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struct vm_area_struct *vma, pud_t *pudp, |
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unsigned long pfn, unsigned long vaddr, |
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pgprot_t prot) |
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{ |
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} |
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static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { } |
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static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } |
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static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { } |
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
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#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP |
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static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) |
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{ |
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pmd_t pmd; |
|
|
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if (!arch_vmap_pmd_supported(prot)) |
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return; |
|
|
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pr_debug("Validating PMD huge\n"); |
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/* |
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* X86 defined pmd_set_huge() verifies that the given |
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* PMD is not a populated non-leaf entry. |
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*/ |
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WRITE_ONCE(*pmdp, __pmd(0)); |
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WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot)); |
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WARN_ON(!pmd_clear_huge(pmdp)); |
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pmd = READ_ONCE(*pmdp); |
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WARN_ON(!pmd_none(pmd)); |
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} |
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|
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static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) |
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{ |
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pud_t pud; |
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|
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if (!arch_vmap_pud_supported(prot)) |
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return; |
|
|
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pr_debug("Validating PUD huge\n"); |
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/* |
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* X86 defined pud_set_huge() verifies that the given |
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* PUD is not a populated non-leaf entry. |
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*/ |
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WRITE_ONCE(*pudp, __pud(0)); |
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WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot)); |
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WARN_ON(!pud_clear_huge(pudp)); |
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pud = READ_ONCE(*pudp); |
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WARN_ON(!pud_none(pud)); |
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} |
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#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ |
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static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) { } |
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static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { } |
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#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ |
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|
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static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot) |
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{ |
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p4d_t p4d; |
|
|
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pr_debug("Validating P4D basic\n"); |
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memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t)); |
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WARN_ON(!p4d_same(p4d, p4d)); |
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} |
|
|
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static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot) |
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{ |
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pgd_t pgd; |
|
|
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pr_debug("Validating PGD basic\n"); |
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memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t)); |
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WARN_ON(!pgd_same(pgd, pgd)); |
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} |
|
|
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#ifndef __PAGETABLE_PUD_FOLDED |
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static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) |
|
{ |
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pud_t pud = READ_ONCE(*pudp); |
|
|
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if (mm_pmd_folded(mm)) |
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return; |
|
|
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pr_debug("Validating PUD clear\n"); |
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pud = __pud(pud_val(pud) | RANDOM_ORVALUE); |
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WRITE_ONCE(*pudp, pud); |
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pud_clear(pudp); |
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pud = READ_ONCE(*pudp); |
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WARN_ON(!pud_none(pud)); |
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} |
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|
|
static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, |
|
pmd_t *pmdp) |
|
{ |
|
pud_t pud; |
|
|
|
if (mm_pmd_folded(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(mm, pudp, pmdp); |
|
pud = READ_ONCE(*pudp); |
|
WARN_ON(pud_bad(pud)); |
|
} |
|
#else /* !__PAGETABLE_PUD_FOLDED */ |
|
static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) { } |
|
static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, |
|
pmd_t *pmdp) |
|
{ |
|
} |
|
#endif /* PAGETABLE_PUD_FOLDED */ |
|
|
|
#ifndef __PAGETABLE_P4D_FOLDED |
|
static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) |
|
{ |
|
p4d_t p4d = READ_ONCE(*p4dp); |
|
|
|
if (mm_pud_folded(mm)) |
|
return; |
|
|
|
pr_debug("Validating P4D clear\n"); |
|
p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE); |
|
WRITE_ONCE(*p4dp, p4d); |
|
p4d_clear(p4dp); |
|
p4d = READ_ONCE(*p4dp); |
|
WARN_ON(!p4d_none(p4d)); |
|
} |
|
|
|
static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, |
|
pud_t *pudp) |
|
{ |
|
p4d_t p4d; |
|
|
|
if (mm_pud_folded(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(pudp); |
|
p4d_clear(p4dp); |
|
p4d_populate(mm, p4dp, pudp); |
|
p4d = READ_ONCE(*p4dp); |
|
WARN_ON(p4d_bad(p4d)); |
|
} |
|
|
|
static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) |
|
{ |
|
pgd_t pgd = READ_ONCE(*pgdp); |
|
|
|
if (mm_p4d_folded(mm)) |
|
return; |
|
|
|
pr_debug("Validating PGD clear\n"); |
|
pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE); |
|
WRITE_ONCE(*pgdp, pgd); |
|
pgd_clear(pgdp); |
|
pgd = READ_ONCE(*pgdp); |
|
WARN_ON(!pgd_none(pgd)); |
|
} |
|
|
|
static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, |
|
p4d_t *p4dp) |
|
{ |
|
pgd_t pgd; |
|
|
|
if (mm_p4d_folded(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(p4dp); |
|
pgd_clear(pgdp); |
|
pgd_populate(mm, pgdp, p4dp); |
|
pgd = READ_ONCE(*pgdp); |
|
WARN_ON(pgd_bad(pgd)); |
|
} |
|
#else /* !__PAGETABLE_P4D_FOLDED */ |
|
static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { } |
|
static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { } |
|
static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, |
|
pud_t *pudp) |
|
{ |
|
} |
|
static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, |
|
p4d_t *p4dp) |
|
{ |
|
} |
|
#endif /* PAGETABLE_P4D_FOLDED */ |
|
|
|
static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, |
|
unsigned long pfn, unsigned long vaddr, |
|
pgprot_t prot) |
|
{ |
|
pte_t pte = pfn_pte(pfn, prot); |
|
|
|
pr_debug("Validating PTE clear\n"); |
|
#ifndef CONFIG_RISCV |
|
pte = __pte(pte_val(pte) | RANDOM_ORVALUE); |
|
#endif |
|
set_pte_at(mm, vaddr, ptep, pte); |
|
barrier(); |
|
pte_clear(mm, vaddr, ptep); |
|
pte = ptep_get(ptep); |
|
WARN_ON(!pte_none(pte)); |
|
} |
|
|
|
static void __init pmd_clear_tests(struct mm_struct *mm, pmd_t *pmdp) |
|
{ |
|
pmd_t pmd = READ_ONCE(*pmdp); |
|
|
|
pr_debug("Validating PMD clear\n"); |
|
pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE); |
|
WRITE_ONCE(*pmdp, pmd); |
|
pmd_clear(pmdp); |
|
pmd = READ_ONCE(*pmdp); |
|
WARN_ON(!pmd_none(pmd)); |
|
} |
|
|
|
static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp, |
|
pgtable_t pgtable) |
|
{ |
|
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(mm, pmdp, pgtable); |
|
pmd = READ_ONCE(*pmdp); |
|
WARN_ON(pmd_bad(pmd)); |
|
} |
|
|
|
static void __init pte_special_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
pte_t pte = pfn_pte(pfn, 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(unsigned long pfn, pgprot_t prot) |
|
{ |
|
pte_t pte = pfn_pte(pfn, prot); |
|
|
|
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(unsigned long pfn, pgprot_t prot) |
|
{ |
|
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(pfn, prot)); |
|
WARN_ON(!pmd_protnone(pmd)); |
|
WARN_ON(!pmd_present(pmd)); |
|
} |
|
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
|
static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) { } |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
|
#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP |
|
static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
pte_t pte = pfn_pte(pfn, prot); |
|
|
|
pr_debug("Validating PTE devmap\n"); |
|
WARN_ON(!pte_devmap(pte_mkdevmap(pte))); |
|
} |
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
pmd_t pmd; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PMD devmap\n"); |
|
pmd = pfn_pmd(pfn, prot); |
|
WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd))); |
|
} |
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
|
static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
pud_t pud; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PUD devmap\n"); |
|
pud = pfn_pud(pfn, prot); |
|
WARN_ON(!pud_devmap(pud_mkdevmap(pud))); |
|
} |
|
#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
|
static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } |
|
#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
|
#else /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { } |
|
static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
#else |
|
static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) { } |
|
static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { } |
|
static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } |
|
#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ |
|
|
|
static void __init pte_soft_dirty_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
pte_t pte = pfn_pte(pfn, 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(unsigned long pfn, pgprot_t prot) |
|
{ |
|
pte_t pte = pfn_pte(pfn, 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(unsigned long pfn, pgprot_t prot) |
|
{ |
|
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(pfn, 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(unsigned long pfn, pgprot_t prot) |
|
{ |
|
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(pfn, 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(unsigned long pfn, pgprot_t prot) { } |
|
static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
} |
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
|
|
|
static void __init pte_swap_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
swp_entry_t swp; |
|
pte_t pte; |
|
|
|
pr_debug("Validating PTE swap\n"); |
|
pte = pfn_pte(pfn, prot); |
|
swp = __pte_to_swp_entry(pte); |
|
pte = __swp_entry_to_pte(swp); |
|
WARN_ON(pfn != pte_pfn(pte)); |
|
} |
|
|
|
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
|
static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
swp_entry_t swp; |
|
pmd_t pmd; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PMD swap\n"); |
|
pmd = pfn_pmd(pfn, prot); |
|
swp = __pmd_to_swp_entry(pmd); |
|
pmd = __swp_entry_to_pmd(swp); |
|
WARN_ON(pfn != pmd_pfn(pmd)); |
|
} |
|
#else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */ |
|
static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { } |
|
#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ |
|
|
|
static void __init swap_migration_tests(void) |
|
{ |
|
struct page *page; |
|
swp_entry_t swp; |
|
|
|
if (!IS_ENABLED(CONFIG_MIGRATION)) |
|
return; |
|
|
|
pr_debug("Validating swap migration\n"); |
|
/* |
|
* 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 allocate a dedicated page explicitly for this |
|
* purpose that will be freed subsequently. |
|
*/ |
|
page = alloc_page(GFP_KERNEL); |
|
if (!page) { |
|
pr_err("page allocation failed\n"); |
|
return; |
|
} |
|
|
|
/* |
|
* make_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); |
|
__free_page(page); |
|
} |
|
|
|
#ifdef CONFIG_HUGETLB_PAGE |
|
static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
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(pfn); |
|
pte = mk_huge_pte(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(pfn, prot); |
|
|
|
WARN_ON(!pte_huge(pte_mkhuge(pte))); |
|
#endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ |
|
} |
|
#else /* !CONFIG_HUGETLB_PAGE */ |
|
static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { } |
|
#endif /* CONFIG_HUGETLB_PAGE */ |
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
|
static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) |
|
{ |
|
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(pfn, 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(unsigned long pfn, pgprot_t prot) |
|
{ |
|
pud_t pud; |
|
|
|
if (!has_transparent_hugepage()) |
|
return; |
|
|
|
pr_debug("Validating PUD based THP\n"); |
|
pud = pfn_pud(pfn, 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(unsigned long pfn, pgprot_t prot) { } |
|
#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
|
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
|
static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) { } |
|
static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { } |
|
#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 int __init debug_vm_pgtable(void) |
|
{ |
|
struct vm_area_struct *vma; |
|
struct mm_struct *mm; |
|
pgd_t *pgdp; |
|
p4d_t *p4dp, *saved_p4dp; |
|
pud_t *pudp, *saved_pudp; |
|
pmd_t *pmdp, *saved_pmdp, pmd; |
|
pte_t *ptep; |
|
pgtable_t saved_ptep; |
|
pgprot_t prot, protnone; |
|
phys_addr_t paddr; |
|
unsigned long vaddr, pte_aligned, pmd_aligned; |
|
unsigned long pud_aligned, p4d_aligned, pgd_aligned; |
|
spinlock_t *ptl = NULL; |
|
int idx; |
|
|
|
pr_info("Validating architecture page table helpers\n"); |
|
prot = vm_get_page_prot(VMFLAGS); |
|
vaddr = get_random_vaddr(); |
|
mm = mm_alloc(); |
|
if (!mm) { |
|
pr_err("mm_struct allocation failed\n"); |
|
return 1; |
|
} |
|
|
|
/* |
|
* __P000 (or even __S000) will help create page table entries with |
|
* PROT_NONE permission as required for pxx_protnone_tests(). |
|
*/ |
|
protnone = __P000; |
|
|
|
vma = vm_area_alloc(mm); |
|
if (!vma) { |
|
pr_err("vma allocation failed\n"); |
|
return 1; |
|
} |
|
|
|
/* |
|
* 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. |
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*/ |
|
paddr = __pa_symbol(&start_kernel); |
|
|
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pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT; |
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pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT; |
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pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT; |
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p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT; |
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pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT; |
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WARN_ON(!pfn_valid(pte_aligned)); |
|
|
|
pgdp = pgd_offset(mm, vaddr); |
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p4dp = p4d_alloc(mm, pgdp, vaddr); |
|
pudp = pud_alloc(mm, p4dp, vaddr); |
|
pmdp = pmd_alloc(mm, pudp, vaddr); |
|
/* |
|
* Allocate pgtable_t |
|
*/ |
|
if (pte_alloc(mm, pmdp)) { |
|
pr_err("pgtable allocation failed\n"); |
|
return 1; |
|
} |
|
|
|
/* |
|
* Save all the page table page addresses as the page table |
|
* entries will be used for testing with random or garbage |
|
* values. These saved addresses will be used for freeing |
|
* page table pages. |
|
*/ |
|
pmd = READ_ONCE(*pmdp); |
|
saved_p4dp = p4d_offset(pgdp, 0UL); |
|
saved_pudp = pud_offset(p4dp, 0UL); |
|
saved_pmdp = pmd_offset(pudp, 0UL); |
|
saved_ptep = pmd_pgtable(pmd); |
|
|
|
/* |
|
* Iterate over the protection_map[] 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. |
|
*/ |
|
for (idx = 0; idx < ARRAY_SIZE(protection_map); idx++) { |
|
pte_basic_tests(pte_aligned, idx); |
|
pmd_basic_tests(pmd_aligned, idx); |
|
pud_basic_tests(mm, pud_aligned, 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(p4d_aligned, prot); |
|
pgd_basic_tests(pgd_aligned, prot); |
|
|
|
pmd_leaf_tests(pmd_aligned, prot); |
|
pud_leaf_tests(pud_aligned, prot); |
|
|
|
pte_savedwrite_tests(pte_aligned, protnone); |
|
pmd_savedwrite_tests(pmd_aligned, protnone); |
|
|
|
pte_special_tests(pte_aligned, prot); |
|
pte_protnone_tests(pte_aligned, protnone); |
|
pmd_protnone_tests(pmd_aligned, protnone); |
|
|
|
pte_devmap_tests(pte_aligned, prot); |
|
pmd_devmap_tests(pmd_aligned, prot); |
|
pud_devmap_tests(pud_aligned, prot); |
|
|
|
pte_soft_dirty_tests(pte_aligned, prot); |
|
pmd_soft_dirty_tests(pmd_aligned, prot); |
|
pte_swap_soft_dirty_tests(pte_aligned, prot); |
|
pmd_swap_soft_dirty_tests(pmd_aligned, prot); |
|
|
|
pte_swap_tests(pte_aligned, prot); |
|
pmd_swap_tests(pmd_aligned, prot); |
|
|
|
swap_migration_tests(); |
|
|
|
pmd_thp_tests(pmd_aligned, prot); |
|
pud_thp_tests(pud_aligned, prot); |
|
|
|
hugetlb_basic_tests(pte_aligned, prot); |
|
|
|
/* |
|
* Page table modifying tests. They need to hold |
|
* proper page table lock. |
|
*/ |
|
|
|
ptep = pte_offset_map_lock(mm, pmdp, vaddr, &ptl); |
|
pte_clear_tests(mm, ptep, pte_aligned, vaddr, prot); |
|
pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); |
|
pte_unmap_unlock(ptep, ptl); |
|
|
|
ptl = pmd_lock(mm, pmdp); |
|
pmd_clear_tests(mm, pmdp); |
|
pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot, saved_ptep); |
|
pmd_huge_tests(pmdp, pmd_aligned, prot); |
|
pmd_populate_tests(mm, pmdp, saved_ptep); |
|
spin_unlock(ptl); |
|
|
|
ptl = pud_lock(mm, pudp); |
|
pud_clear_tests(mm, pudp); |
|
pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot); |
|
pud_huge_tests(pudp, pud_aligned, prot); |
|
pud_populate_tests(mm, pudp, saved_pmdp); |
|
spin_unlock(ptl); |
|
|
|
spin_lock(&mm->page_table_lock); |
|
p4d_clear_tests(mm, p4dp); |
|
pgd_clear_tests(mm, pgdp); |
|
p4d_populate_tests(mm, p4dp, saved_pudp); |
|
pgd_populate_tests(mm, pgdp, saved_p4dp); |
|
spin_unlock(&mm->page_table_lock); |
|
|
|
p4d_free(mm, saved_p4dp); |
|
pud_free(mm, saved_pudp); |
|
pmd_free(mm, saved_pmdp); |
|
pte_free(mm, saved_ptep); |
|
|
|
vm_area_free(vma); |
|
mm_dec_nr_puds(mm); |
|
mm_dec_nr_pmds(mm); |
|
mm_dec_nr_ptes(mm); |
|
mmdrop(mm); |
|
return 0; |
|
} |
|
late_initcall(debug_vm_pgtable);
|
|
|