diff options
Diffstat (limited to 'mm/debug_vm_pgtable.c')
| -rw-r--r-- | mm/debug_vm_pgtable.c | 668 |
1 files changed, 665 insertions, 3 deletions
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 61ab16fb2e36..086309fb9b6f 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -8,7 +8,7 @@ * * Author: Anshuman Khandual <[email protected]> */ -#define pr_fmt(fmt) "debug_vm_pgtable: %s: " fmt, __func__ +#define pr_fmt(fmt) "debug_vm_pgtable: [%-25s]: " fmt, __func__ #include <linux/gfp.h> #include <linux/highmem.h> @@ -21,6 +21,7 @@ #include <linux/module.h> #include <linux/pfn_t.h> #include <linux/printk.h> +#include <linux/pgtable.h> #include <linux/random.h> #include <linux/spinlock.h> #include <linux/swap.h> @@ -28,6 +29,13 @@ #include <linux/start_kernel.h> #include <linux/sched/mm.h> #include <asm/pgalloc.h> +#include <asm/tlbflush.h> + +/* + * Please refer Documentation/vm/arch_pgtable_helpers.rst for the semantics + * expectations that are being validated here. All future changes in here + * or the documentation need to be in sync. + */ #define VMFLAGS (VM_READ|VM_WRITE|VM_EXEC) @@ -46,6 +54,7 @@ static void __init pte_basic_tests(unsigned long pfn, pgprot_t prot) { pte_t pte = pfn_pte(pfn, prot); + pr_debug("Validating PTE basic\n"); WARN_ON(!pte_same(pte, pte)); WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte)))); WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte)))); @@ -55,6 +64,57 @@ static void __init pte_basic_tests(unsigned long pfn, pgprot_t prot) WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte)))); } +static void __init pte_advanced_tests(struct mm_struct *mm, + struct vm_area_struct *vma, pte_t *ptep, + unsigned long pfn, unsigned long vaddr, + pgprot_t prot) +{ + pte_t pte = pfn_pte(pfn, prot); + + pr_debug("Validating PTE advanced\n"); + pte = pfn_pte(pfn, prot); + set_pte_at(mm, vaddr, ptep, pte); + ptep_set_wrprotect(mm, vaddr, ptep); + pte = ptep_get(ptep); + WARN_ON(pte_write(pte)); + + pte = pfn_pte(pfn, prot); + set_pte_at(mm, vaddr, ptep, pte); + ptep_get_and_clear(mm, vaddr, ptep); + pte = ptep_get(ptep); + WARN_ON(!pte_none(pte)); + + pte = pfn_pte(pfn, prot); + pte = pte_wrprotect(pte); + pte = pte_mkclean(pte); + set_pte_at(mm, vaddr, ptep, pte); + pte = pte_mkwrite(pte); + pte = pte_mkdirty(pte); + ptep_set_access_flags(vma, vaddr, ptep, pte, 1); + pte = ptep_get(ptep); + WARN_ON(!(pte_write(pte) && pte_dirty(pte))); + + pte = pfn_pte(pfn, prot); + set_pte_at(mm, vaddr, ptep, pte); + ptep_get_and_clear_full(mm, vaddr, ptep, 1); + pte = ptep_get(ptep); + WARN_ON(!pte_none(pte)); + + pte = pte_mkyoung(pte); + set_pte_at(mm, vaddr, ptep, pte); + ptep_test_and_clear_young(vma, vaddr, ptep); + pte = ptep_get(ptep); + WARN_ON(pte_young(pte)); +} + +static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot) +{ + pte_t pte = pfn_pte(pfn, prot); + + pr_debug("Validating PTE saved write\n"); + WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte)))); + WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte)))); +} #ifdef CONFIG_TRANSPARENT_HUGEPAGE static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot) { @@ -63,6 +123,7 @@ static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot) if (!has_transparent_hugepage()) return; + pr_debug("Validating PMD basic\n"); WARN_ON(!pmd_same(pmd, pmd)); WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd)))); WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd)))); @@ -77,6 +138,95 @@ static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot) WARN_ON(!pmd_bad(pmd_mkhuge(pmd))); } +static void __init pmd_advanced_tests(struct mm_struct *mm, + struct vm_area_struct *vma, pmd_t *pmdp, + unsigned long pfn, unsigned long vaddr, + pgprot_t prot) +{ + pmd_t pmd = pfn_pmd(pfn, prot); + + if (!has_transparent_hugepage()) + return; + + pr_debug("Validating PMD advanced\n"); + /* Align the address wrt HPAGE_PMD_SIZE */ + vaddr = (vaddr & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE; + + pmd = pfn_pmd(pfn, prot); + set_pmd_at(mm, vaddr, pmdp, pmd); + pmdp_set_wrprotect(mm, vaddr, pmdp); + pmd = READ_ONCE(*pmdp); + WARN_ON(pmd_write(pmd)); + + pmd = pfn_pmd(pfn, prot); + set_pmd_at(mm, vaddr, pmdp, pmd); + pmdp_huge_get_and_clear(mm, vaddr, pmdp); + pmd = READ_ONCE(*pmdp); + WARN_ON(!pmd_none(pmd)); + + pmd = pfn_pmd(pfn, prot); + pmd = pmd_wrprotect(pmd); + pmd = pmd_mkclean(pmd); + set_pmd_at(mm, vaddr, pmdp, pmd); + pmd = pmd_mkwrite(pmd); + pmd = pmd_mkdirty(pmd); + pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1); + pmd = READ_ONCE(*pmdp); + WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); + + pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); + set_pmd_at(mm, vaddr, pmdp, pmd); + pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1); + pmd = READ_ONCE(*pmdp); + WARN_ON(!pmd_none(pmd)); + + pmd = pmd_mkyoung(pmd); + set_pmd_at(mm, vaddr, pmdp, pmd); + pmdp_test_and_clear_young(vma, vaddr, pmdp); + pmd = READ_ONCE(*pmdp); + WARN_ON(pmd_young(pmd)); +} + +static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) +{ + pmd_t pmd = pfn_pmd(pfn, prot); + + pr_debug("Validating PMD leaf\n"); + /* + * PMD based THP is a leaf entry. + */ + pmd = pmd_mkhuge(pmd); + WARN_ON(!pmd_leaf(pmd)); +} + +static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) +{ + pmd_t pmd; + + if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP)) + 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(*pmdp, __pmd(0)); + WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot)); + WARN_ON(!pmd_clear_huge(pmdp)); + pmd = READ_ONCE(*pmdp); + WARN_ON(!pmd_none(pmd)); +} + +static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) +{ + pmd_t pmd = pfn_pmd(pfn, prot); + + pr_debug("Validating PMD saved write\n"); + WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd)))); + WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd)))); +} + #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) { @@ -85,6 +235,7 @@ static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) if (!has_transparent_hugepage()) return; + pr_debug("Validating PUD basic\n"); WARN_ON(!pud_same(pud, pud)); WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud)))); WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud)))); @@ -100,18 +251,130 @@ static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) */ WARN_ON(!pud_bad(pud_mkhuge(pud))); } + +static void __init pud_advanced_tests(struct mm_struct *mm, + struct vm_area_struct *vma, pud_t *pudp, + unsigned long pfn, unsigned long vaddr, + pgprot_t prot) +{ + pud_t pud = pfn_pud(pfn, prot); + + if (!has_transparent_hugepage()) + return; + + pr_debug("Validating PUD advanced\n"); + /* Align the address wrt HPAGE_PUD_SIZE */ + vaddr = (vaddr & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE; + + set_pud_at(mm, vaddr, pudp, pud); + pudp_set_wrprotect(mm, vaddr, pudp); + pud = READ_ONCE(*pudp); + WARN_ON(pud_write(pud)); + +#ifndef __PAGETABLE_PMD_FOLDED + pud = pfn_pud(pfn, prot); + set_pud_at(mm, vaddr, pudp, pud); + pudp_huge_get_and_clear(mm, vaddr, pudp); + pud = READ_ONCE(*pudp); + WARN_ON(!pud_none(pud)); + + pud = pfn_pud(pfn, prot); + set_pud_at(mm, vaddr, pudp, pud); + pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1); + pud = READ_ONCE(*pudp); + WARN_ON(!pud_none(pud)); +#endif /* __PAGETABLE_PMD_FOLDED */ + pud = pfn_pud(pfn, prot); + pud = pud_wrprotect(pud); + pud = pud_mkclean(pud); + set_pud_at(mm, vaddr, pudp, pud); + pud = pud_mkwrite(pud); + pud = pud_mkdirty(pud); + pudp_set_access_flags(vma, vaddr, pudp, pud, 1); + pud = READ_ONCE(*pudp); + WARN_ON(!(pud_write(pud) && pud_dirty(pud))); + + pud = pud_mkyoung(pud); + set_pud_at(mm, vaddr, pudp, pud); + pudp_test_and_clear_young(vma, vaddr, pudp); + pud = READ_ONCE(*pudp); + WARN_ON(pud_young(pud)); +} + +static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) +{ + pud_t pud = pfn_pud(pfn, prot); + + pr_debug("Validating PUD leaf\n"); + /* + * PUD based THP is a leaf entry. + */ + pud = pud_mkhuge(pud); + WARN_ON(!pud_leaf(pud)); +} + +static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) +{ + pud_t pud; + + if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP)) + 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(*pudp, __pud(0)); + WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot)); + WARN_ON(!pud_clear_huge(pudp)); + pud = READ_ONCE(*pudp); + WARN_ON(!pud_none(pud)); +} #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) { } +static void __init pud_advanced_tests(struct mm_struct *mm, + struct vm_area_struct *vma, pud_t *pudp, + unsigned long pfn, unsigned long vaddr, + pgprot_t prot) +{ +} +static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } +static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) +{ +} #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot) { } static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) { } +static void __init pmd_advanced_tests(struct mm_struct *mm, + struct vm_area_struct *vma, pmd_t *pmdp, + unsigned long pfn, unsigned long vaddr, + pgprot_t prot) +{ +} +static void __init pud_advanced_tests(struct mm_struct *mm, + struct vm_area_struct *vma, pud_t *pudp, + unsigned long pfn, unsigned long vaddr, + pgprot_t prot) +{ +} +static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { } +static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } +static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) +{ +} +static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) +{ +} +static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot) { p4d_t p4d; + pr_debug("Validating P4D basic\n"); memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t)); WARN_ON(!p4d_same(p4d, p4d)); } @@ -120,6 +383,7 @@ static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot) { pgd_t pgd; + pr_debug("Validating PGD basic\n"); memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t)); WARN_ON(!pgd_same(pgd, pgd)); } @@ -132,6 +396,7 @@ static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) if (mm_pmd_folded(mm)) return; + pr_debug("Validating PUD clear\n"); pud = __pud(pud_val(pud) | RANDOM_ORVALUE); WRITE_ONCE(*pudp, pud); pud_clear(pudp); @@ -146,6 +411,8 @@ static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, 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(). @@ -172,6 +439,7 @@ static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *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); @@ -187,6 +455,7 @@ static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, 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(). @@ -205,6 +474,7 @@ static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *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); @@ -220,6 +490,7 @@ static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, 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(). @@ -248,6 +519,7 @@ static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, { pte_t pte = ptep_get(ptep); + pr_debug("Validating PTE clear\n"); pte = __pte(pte_val(pte) | RANDOM_ORVALUE); set_pte_at(mm, vaddr, ptep, pte); barrier(); @@ -260,6 +532,7 @@ 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); @@ -272,6 +545,7 @@ static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp, { 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(). @@ -282,6 +556,344 @@ static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *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 = pmd_mkhuge(pfn_pmd(pfn, prot)); + + if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) + return; + + pr_debug("Validating PMD protnone\n"); + 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 = pfn_pmd(pfn, prot); + + pr_debug("Validating PMD devmap\n"); + 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 = pfn_pud(pfn, prot); + + pr_debug("Validating PUD devmap\n"); + 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 = pfn_pmd(pfn, prot); + + if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) + return; + + pr_debug("Validating PMD soft dirty\n"); + 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 = pfn_pmd(pfn, prot); + + if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) || + !IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION)) + return; + + pr_debug("Validating PMD swap soft dirty\n"); + 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_ARCH_HAS_PTE_DEVMAP */ +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_ARCH_HAS_PTE_DEVMAP */ + +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; + + 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_migration_entry(page, 1); + WARN_ON(!is_migration_entry(swp)); + WARN_ON(!is_write_migration_entry(swp)); + + make_migration_entry_read(&swp); + WARN_ON(!is_migration_entry(swp)); + WARN_ON(is_write_migration_entry(swp)); + + swp = make_migration_entry(page, 0); + WARN_ON(!is_migration_entry(swp)); + WARN_ON(is_write_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 */ +} + +static void __init hugetlb_advanced_tests(struct mm_struct *mm, + struct vm_area_struct *vma, + pte_t *ptep, unsigned long pfn, + unsigned long vaddr, pgprot_t prot) +{ + struct page *page = pfn_to_page(pfn); + pte_t pte = ptep_get(ptep); + unsigned long paddr = __pfn_to_phys(pfn) & PMD_MASK; + + pr_debug("Validating HugeTLB advanced\n"); + pte = pte_mkhuge(mk_pte(pfn_to_page(PHYS_PFN(paddr)), prot)); + set_huge_pte_at(mm, vaddr, ptep, pte); + barrier(); + WARN_ON(!pte_same(pte, huge_ptep_get(ptep))); + huge_pte_clear(mm, vaddr, ptep, PMD_SIZE); + pte = huge_ptep_get(ptep); + WARN_ON(!huge_pte_none(pte)); + + pte = mk_huge_pte(page, prot); + set_huge_pte_at(mm, vaddr, ptep, pte); + barrier(); + huge_ptep_set_wrprotect(mm, vaddr, ptep); + pte = huge_ptep_get(ptep); + WARN_ON(huge_pte_write(pte)); + + pte = mk_huge_pte(page, prot); + set_huge_pte_at(mm, vaddr, ptep, pte); + barrier(); + huge_ptep_get_and_clear(mm, vaddr, ptep); + pte = huge_ptep_get(ptep); + WARN_ON(!huge_pte_none(pte)); + + pte = mk_huge_pte(page, prot); + pte = huge_pte_wrprotect(pte); + set_huge_pte_at(mm, vaddr, ptep, pte); + barrier(); + pte = huge_pte_mkwrite(pte); + pte = huge_pte_mkdirty(pte); + huge_ptep_set_access_flags(vma, vaddr, ptep, pte, 1); + pte = huge_ptep_get(ptep); + WARN_ON(!(huge_pte_write(pte) && huge_pte_dirty(pte))); +} +#else /* !CONFIG_HUGETLB_PAGE */ +static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { } +static void __init hugetlb_advanced_tests(struct mm_struct *mm, + struct vm_area_struct *vma, + pte_t *ptep, unsigned long pfn, + unsigned long vaddr, 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; @@ -296,6 +908,7 @@ static unsigned long __init get_random_vaddr(void) static int __init debug_vm_pgtable(void) { + struct vm_area_struct *vma; struct mm_struct *mm; pgd_t *pgdp; p4d_t *p4dp, *saved_p4dp; @@ -303,11 +916,11 @@ static int __init debug_vm_pgtable(void) pmd_t *pmdp, *saved_pmdp, pmd; pte_t *ptep; pgtable_t saved_ptep; - pgprot_t prot; + 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 *uninitialized_var(ptl); + spinlock_t *ptl = NULL; pr_info("Validating architecture page table helpers\n"); prot = vm_get_page_prot(VMFLAGS); @@ -319,6 +932,18 @@ static int __init debug_vm_pgtable(void) } /* + * __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 @@ -366,6 +991,20 @@ static int __init debug_vm_pgtable(void) p4d_clear_tests(mm, p4dp); pgd_clear_tests(mm, pgdp); + pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); + pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot); + pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot); + hugetlb_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); + + pmd_leaf_tests(pmd_aligned, prot); + pud_leaf_tests(pud_aligned, prot); + + pmd_huge_tests(pmdp, pmd_aligned, prot); + pud_huge_tests(pudp, pud_aligned, prot); + + pte_savedwrite_tests(pte_aligned, prot); + pmd_savedwrite_tests(pmd_aligned, prot); + pte_unmap_unlock(ptep, ptl); pmd_populate_tests(mm, pmdp, saved_ptep); @@ -373,11 +1012,34 @@ static int __init debug_vm_pgtable(void) p4d_populate_tests(mm, p4dp, saved_pudp); pgd_populate_tests(mm, pgdp, saved_p4dp); + 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(); + hugetlb_basic_tests(pte_aligned, prot); + + pmd_thp_tests(pmd_aligned, prot); + pud_thp_tests(pud_aligned, prot); + 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); |