mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Anshuman Khandual](/assets/img/avatar_default.png)
Patch series "mm/debug_vm_pgtable: Add some more tests", v5. This series adds some more arch page table helper validation tests which are related to core and advanced memory functions. This also creates a documentation, enlisting expected semantics for all page table helpers as suggested by Mike Rapoport previously (https://lkml.org/lkml/2020/1/30/40). There are many TRANSPARENT_HUGEPAGE and ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD ifdefs scattered across the test. But consolidating all the fallback stubs is not very straight forward because ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD is not explicitly dependent on ARCH_HAS_TRANSPARENT_HUGEPAGE. Tested on arm64, x86 platforms but only build tested on all other enabled platforms through ARCH_HAS_DEBUG_VM_PGTABLE i.e powerpc, arc, s390. The following failure on arm64 still exists which was mentioned previously. It will be fixed with the upcoming THP migration on arm64 enablement series. WARNING .... mm/debug_vm_pgtable.c:860 debug_vm_pgtable+0x940/0xa54 WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd)))) This patch (of 4): This adds new tests validating arch page table helpers for these following core memory features. These tests create and test specific mapping types at various page table levels. 1. SPECIAL mapping 2. PROTNONE mapping 3. DEVMAP mapping 4. SOFTDIRTY mapping 5. SWAP mapping 6. MIGRATION mapping 7. HUGETLB mapping 8. THP mapping Suggested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Vineet Gupta <vgupta@synopsys.com> [arc] Reviewed-by: Zi Yan <ziy@nvidia.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Kirill A. Shutemov <kirill@shutemov.name> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mike Rapoport <rppt@kernel.org> Cc: Steven Price <steven.price@arm.com> Link: http://lkml.kernel.org/r/1594610587-4172-1-git-send-email-anshuman.khandual@arm.com Link: http://lkml.kernel.org/r/1593996516-7186-1-git-send-email-anshuman.khandual@arm.com Link: http://lkml.kernel.org/r/1593996516-7186-2-git-send-email-anshuman.khandual@arm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
687 lines
19 KiB
C
687 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* This kernel test validates architecture page table helpers and
|
|
* accessors and helps in verifying their continued compliance with
|
|
* expected generic MM semantics.
|
|
*
|
|
* Copyright (C) 2019 ARM Ltd.
|
|
*
|
|
* Author: Anshuman Khandual <anshuman.khandual@arm.com>
|
|
*/
|
|
#define pr_fmt(fmt) "debug_vm_pgtable: %s: " fmt, __func__
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/hugetlb.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kconfig.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm_types.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pfn_t.h>
|
|
#include <linux/printk.h>
|
|
#include <linux/random.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/swapops.h>
|
|
#include <linux/start_kernel.h>
|
|
#include <linux/sched/mm.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
#define VMFLAGS (VM_READ|VM_WRITE|VM_EXEC)
|
|
|
|
/*
|
|
* On s390 platform, the lower 4 bits are used to identify given page table
|
|
* entry type. But these bits might affect the ability to clear entries with
|
|
* pxx_clear() because of how dynamic page table folding works on s390. So
|
|
* while loading up the entries do not change the lower 4 bits. It does not
|
|
* have affect any other platform.
|
|
*/
|
|
#define S390_MASK_BITS 4
|
|
#define RANDOM_ORVALUE GENMASK(BITS_PER_LONG - 1, S390_MASK_BITS)
|
|
#define RANDOM_NZVALUE GENMASK(7, 0)
|
|
|
|
static void __init pte_basic_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pte_t pte = pfn_pte(pfn, prot);
|
|
|
|
WARN_ON(!pte_same(pte, pte));
|
|
WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte))));
|
|
WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte))));
|
|
WARN_ON(!pte_write(pte_mkwrite(pte_wrprotect(pte))));
|
|
WARN_ON(pte_young(pte_mkold(pte_mkyoung(pte))));
|
|
WARN_ON(pte_dirty(pte_mkclean(pte_mkdirty(pte))));
|
|
WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte))));
|
|
}
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pmd_t pmd = pfn_pmd(pfn, prot);
|
|
|
|
if (!has_transparent_hugepage())
|
|
return;
|
|
|
|
WARN_ON(!pmd_same(pmd, pmd));
|
|
WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd))));
|
|
WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd))));
|
|
WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd))));
|
|
WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd))));
|
|
WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd))));
|
|
WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd))));
|
|
/*
|
|
* A huge page does not point to next level page table
|
|
* entry. Hence this must qualify as pmd_bad().
|
|
*/
|
|
WARN_ON(!pmd_bad(pmd_mkhuge(pmd)));
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
|
|
static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pud_t pud = pfn_pud(pfn, prot);
|
|
|
|
if (!has_transparent_hugepage())
|
|
return;
|
|
|
|
WARN_ON(!pud_same(pud, pud));
|
|
WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud))));
|
|
WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud))));
|
|
WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud))));
|
|
WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud))));
|
|
|
|
if (mm_pmd_folded(mm))
|
|
return;
|
|
|
|
/*
|
|
* A huge page does not point to next level page table
|
|
* entry. Hence this must qualify as pud_bad().
|
|
*/
|
|
WARN_ON(!pud_bad(pud_mkhuge(pud)));
|
|
}
|
|
#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
|
|
static void __init pud_basic_tests(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) { }
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
p4d_t p4d;
|
|
|
|
memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t));
|
|
WARN_ON(!p4d_same(p4d, p4d));
|
|
}
|
|
|
|
static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot)
|
|
{
|
|
pgd_t pgd;
|
|
|
|
memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t));
|
|
WARN_ON(!pgd_same(pgd, pgd));
|
|
}
|
|
|
|
#ifndef __PAGETABLE_PUD_FOLDED
|
|
static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp)
|
|
{
|
|
pud_t pud = READ_ONCE(*pudp);
|
|
|
|
if (mm_pmd_folded(mm))
|
|
return;
|
|
|
|
pud = __pud(pud_val(pud) | RANDOM_ORVALUE);
|
|
WRITE_ONCE(*pudp, pud);
|
|
pud_clear(pudp);
|
|
pud = READ_ONCE(*pudp);
|
|
WARN_ON(!pud_none(pud));
|
|
}
|
|
|
|
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;
|
|
/*
|
|
* This entry points to next level page table page.
|
|
* Hence this must not qualify as pud_bad().
|
|
*/
|
|
pmd_clear(pmdp);
|
|
pud_clear(pudp);
|
|
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;
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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 vaddr)
|
|
{
|
|
pte_t pte = ptep_get(ptep);
|
|
|
|
pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
|
|
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);
|
|
|
|
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;
|
|
|
|
/*
|
|
* This entry points to next level page table page.
|
|
* Hence this must not qualify as pmd_bad().
|
|
*/
|
|
pmd_clear(pmdp);
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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 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;
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
paddr = __pa_symbol(&start_kernel);
|
|
|
|
pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT;
|
|
pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT;
|
|
pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT;
|
|
p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT;
|
|
pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT;
|
|
WARN_ON(!pfn_valid(pte_aligned));
|
|
|
|
pgdp = pgd_offset(mm, vaddr);
|
|
p4dp = p4d_alloc(mm, pgdp, vaddr);
|
|
pudp = pud_alloc(mm, p4dp, vaddr);
|
|
pmdp = pmd_alloc(mm, pudp, vaddr);
|
|
ptep = pte_alloc_map_lock(mm, pmdp, vaddr, &ptl);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
pte_basic_tests(pte_aligned, prot);
|
|
pmd_basic_tests(pmd_aligned, prot);
|
|
pud_basic_tests(pud_aligned, prot);
|
|
p4d_basic_tests(p4d_aligned, prot);
|
|
pgd_basic_tests(pgd_aligned, prot);
|
|
|
|
pte_clear_tests(mm, ptep, vaddr);
|
|
pmd_clear_tests(mm, pmdp);
|
|
pud_clear_tests(mm, pudp);
|
|
p4d_clear_tests(mm, p4dp);
|
|
pgd_clear_tests(mm, pgdp);
|
|
|
|
pte_unmap_unlock(ptep, ptl);
|
|
|
|
pmd_populate_tests(mm, pmdp, saved_ptep);
|
|
pud_populate_tests(mm, pudp, saved_pmdp);
|
|
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);
|
|
|
|
mm_dec_nr_puds(mm);
|
|
mm_dec_nr_pmds(mm);
|
|
mm_dec_nr_ptes(mm);
|
|
mmdrop(mm);
|
|
return 0;
|
|
}
|
|
late_initcall(debug_vm_pgtable);
|