From patchwork Mon Jul 13 03:23:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 1327685 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2001:8b0:10b:1231::1; helo=merlin.infradead.org; envelope-from=linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; secure) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=merlin.20170209 header.b=dGKOpA9V; dkim-atps=neutral Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4B4psX29K1z9sRk for ; Mon, 13 Jul 2020 13:24:16 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=fN2UsnBXNpmr86+WPPtutOpqTbtAdQGl21T0tBJ6Q+A=; b=dGKOpA9Vee0cc8I6dqtBcmubPL dvtl0LGGgZ/X3lbeniNA5RSkxU0JW6RQ0GLYDxjX5Mp/e1EYtXkIxTf/U+sbyEAcYIHlQvIZSTTDQ BpLCLCXr5U9a+419iIOxCvcIZydlei36yEzAWZhIBtyDyrhbexKEUCjh3cltJxUVxHewQaZUtvbjX IbCqTynVArRrrB/phXiTYUN1u0bAIuhiFZveBZP8Je5Mk3WLRH2jTUVtVTl9GYwd+aWYbk5OpPOoL 4YsxT5D6heSo4AGLAhNYfzNIGrVu1b428MgVq5SiaI62ag/zEKol6JO6/8kSNZsyIi0DuyeZ1mP2N a2+Y5s5w==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jup4f-000233-41; Mon, 13 Jul 2020 03:24:13 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jup4W-0001zd-Qw; Mon, 13 Jul 2020 03:24:06 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CCE281FB; Sun, 12 Jul 2020 20:24:01 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.87.124]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 86D823F7D8; Sun, 12 Jul 2020 20:23:50 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Subject: [PATCH V5 1/4] mm/debug_vm_pgtable: Add tests validating arch helpers for core MM features Date: Mon, 13 Jul 2020 08:53:04 +0530 Message-Id: <1594610587-4172-2-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1594610587-4172-1-git-send-email-anshuman.khandual@arm.com> References: <1594610587-4172-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200712_232405_001664_CEFA25D3 X-CRM114-Status: GOOD ( 22.82 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Heiko Carstens , Paul Mackerras , "H. Peter Anvin" , agordeev@linux.ibm.com, Will Deacon , linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, christophe.leroy@csgroup.eu, Mike Rapoport , Christian Borntraeger , Ingo Molnar , linux-arm-kernel@lists.infradead.org, ziy@nvidia.com, Benjamin Herrenschmidt , linux-snps-arc@lists.infradead.org, Vasily Gorbik , Anshuman Khandual , cai@lca.pw, Paul Walmsley , "Kirill A . Shutemov" , Thomas Gleixner , gerald.schaefer@de.ibm.com, christophe.leroy@c-s.fr, Vineet Gupta , linux-kernel@vger.kernel.org, Palmer Dabbelt , aneesh.kumar@linux.ibm.com, Borislav Petkov , Andrew Morton , linuxppc-dev@lists.ozlabs.org, rppt@kernel.org MIME-Version: 1.0 Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org 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 Cc: Andrew Morton Cc: Gerald Schaefer Cc: Christophe Leroy Cc: Mike Rapoport Cc: Vineet Gupta Cc: Catalin Marinas Cc: Will Deacon Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Kirill A. Shutemov Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: linux-snps-arc@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-riscv@lists.infradead.org Cc: x86@kernel.org Cc: linux-mm@kvack.org Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Tested-by: Vineet Gupta #arc Reviewed-by: Zi Yan Suggested-by: Catalin Marinas Signed-off-by: Anshuman Khandual --- mm/debug_vm_pgtable.c | 302 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 301 insertions(+), 1 deletion(-) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 61ab16fb2e36..2fac47db3eb7 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -282,6 +282,278 @@ 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; + + 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; @@ -303,7 +575,7 @@ 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; @@ -318,6 +590,12 @@ static int __init debug_vm_pgtable(void) 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 @@ -373,6 +651,28 @@ 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); From patchwork Mon Jul 13 03:23:05 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 1327687 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; 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Sun, 12 Jul 2020 20:24:02 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Subject: [PATCH V5 2/4] mm/debug_vm_pgtable: Add tests validating advanced arch page table helpers Date: Mon, 13 Jul 2020 08:53:05 +0530 Message-Id: <1594610587-4172-3-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1594610587-4172-1-git-send-email-anshuman.khandual@arm.com> References: <1594610587-4172-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200712_232416_146027_180296B9 X-CRM114-Status: GOOD ( 19.15 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Heiko Carstens , Paul Mackerras , "H. Peter Anvin" , agordeev@linux.ibm.com, Will Deacon , linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, christophe.leroy@csgroup.eu, Mike Rapoport , Christian Borntraeger , Ingo Molnar , linux-arm-kernel@lists.infradead.org, ziy@nvidia.com, Benjamin Herrenschmidt , linux-snps-arc@lists.infradead.org, Vasily Gorbik , Anshuman Khandual , cai@lca.pw, Paul Walmsley , "Kirill A . Shutemov" , Thomas Gleixner , gerald.schaefer@de.ibm.com, christophe.leroy@c-s.fr, Vineet Gupta , linux-kernel@vger.kernel.org, Palmer Dabbelt , aneesh.kumar@linux.ibm.com, Borislav Petkov , Andrew Morton , linuxppc-dev@lists.ozlabs.org, rppt@kernel.org MIME-Version: 1.0 Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org This adds new tests validating for these following arch advanced page table helpers. These tests create and test specific mapping types at various page table levels. 1. pxxp_set_wrprotect() 2. pxxp_get_and_clear() 3. pxxp_set_access_flags() 4. pxxp_get_and_clear_full() 5. pxxp_test_and_clear_young() 6. pxx_leaf() 7. pxx_set_huge() 8. pxx_(clear|mk)_savedwrite() 9. huge_pxxp_xxx() Cc: Andrew Morton Cc: Gerald Schaefer Cc: Christophe Leroy Cc: Mike Rapoport Cc: Vineet Gupta Cc: Catalin Marinas Cc: Will Deacon Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Kirill A. Shutemov Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: linux-snps-arc@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-riscv@lists.infradead.org Cc: x86@kernel.org Cc: linux-mm@kvack.org Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Tested-by: Vineet Gupta #arc Suggested-by: Catalin Marinas Signed-off-by: Anshuman Khandual --- mm/debug_vm_pgtable.c | 312 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 312 insertions(+) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 2fac47db3eb7..9c7c11eecf17 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include #include @@ -28,6 +29,7 @@ #include #include #include +#include #define VMFLAGS (VM_READ|VM_WRITE|VM_EXEC) @@ -55,6 +57,55 @@ 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); + + 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); + + 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) { @@ -77,6 +128,90 @@ 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; + + /* 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); + + /* + * 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; + /* + * 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); + + 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) { @@ -100,12 +235,119 @@ 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; + + /* 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); + + /* + * 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; + /* + * 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) @@ -495,8 +737,56 @@ static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t 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; + + 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 @@ -568,6 +858,7 @@ 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; @@ -596,6 +887,12 @@ static int __init debug_vm_pgtable(void) */ 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 @@ -644,6 +941,20 @@ 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); @@ -678,6 +989,7 @@ static int __init debug_vm_pgtable(void) 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); From patchwork Mon Jul 13 03:23:06 2020 Content-Type: text/plain; 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Mon, 13 Jul 2020 03:24:51 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jup4x-0002BK-DG; Mon, 13 Jul 2020 03:24:33 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B64FD1FB; Sun, 12 Jul 2020 20:24:27 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.87.124]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id BB9343F7D8; Sun, 12 Jul 2020 20:24:14 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Subject: [PATCH V5 3/4] mm/debug_vm_pgtable: Add debug prints for individual tests Date: Mon, 13 Jul 2020 08:53:06 +0530 Message-Id: <1594610587-4172-4-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1594610587-4172-1-git-send-email-anshuman.khandual@arm.com> References: <1594610587-4172-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200712_232431_596698_A2816A36 X-CRM114-Status: GOOD ( 17.29 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Heiko Carstens , Paul Mackerras , "H. Peter Anvin" , agordeev@linux.ibm.com, Will Deacon , linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, christophe.leroy@csgroup.eu, Mike Rapoport , Christian Borntraeger , Ingo Molnar , linux-arm-kernel@lists.infradead.org, ziy@nvidia.com, Benjamin Herrenschmidt , linux-snps-arc@lists.infradead.org, Vasily Gorbik , Anshuman Khandual , cai@lca.pw, Paul Walmsley , "Kirill A . Shutemov" , Thomas Gleixner , gerald.schaefer@de.ibm.com, christophe.leroy@c-s.fr, Vineet Gupta , linux-kernel@vger.kernel.org, Palmer Dabbelt , aneesh.kumar@linux.ibm.com, Borislav Petkov , Andrew Morton , linuxppc-dev@lists.ozlabs.org, rppt@kernel.org MIME-Version: 1.0 Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org This adds debug print information that enlists all tests getting executed on a given platform. With dynamic debug enabled, the following information will be splashed during boot. For compactness purpose, dropped both time stamp and prefix (i.e debug_vm_pgtable) from this sample output. [debug_vm_pgtable ]: Validating architecture page table helpers [pte_basic_tests ]: Validating PTE basic [pmd_basic_tests ]: Validating PMD basic [p4d_basic_tests ]: Validating P4D basic [pgd_basic_tests ]: Validating PGD basic [pte_clear_tests ]: Validating PTE clear [pmd_clear_tests ]: Validating PMD clear [pte_advanced_tests ]: Validating PTE advanced [pmd_advanced_tests ]: Validating PMD advanced [hugetlb_advanced_tests]: Validating HugeTLB advanced [pmd_leaf_tests ]: Validating PMD leaf [pmd_huge_tests ]: Validating PMD huge [pte_savedwrite_tests ]: Validating PTE saved write [pmd_savedwrite_tests ]: Validating PMD saved write [pmd_populate_tests ]: Validating PMD populate [pte_special_tests ]: Validating PTE special [pte_protnone_tests ]: Validating PTE protnone [pmd_protnone_tests ]: Validating PMD protnone [pte_devmap_tests ]: Validating PTE devmap [pmd_devmap_tests ]: Validating PMD devmap [pte_swap_tests ]: Validating PTE swap [swap_migration_tests ]: Validating swap migration [hugetlb_basic_tests ]: Validating HugeTLB basic [pmd_thp_tests ]: Validating PMD based THP Cc: Andrew Morton Cc: Gerald Schaefer Cc: Christophe Leroy Cc: Mike Rapoport Cc: Vineet Gupta Cc: Catalin Marinas Cc: Will Deacon Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Kirill A. Shutemov Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: linux-snps-arc@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-riscv@lists.infradead.org Cc: x86@kernel.org Cc: linux-mm@kvack.org Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Tested-by: Vineet Gupta #arc Signed-off-by: Anshuman Khandual --- mm/debug_vm_pgtable.c | 46 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 45 insertions(+), 1 deletion(-) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 9c7c11eecf17..0db4390435be 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -8,7 +8,7 @@ * * Author: Anshuman Khandual */ -#define pr_fmt(fmt) "debug_vm_pgtable: %s: " fmt, __func__ +#define pr_fmt(fmt) "debug_vm_pgtable: [%-25s]: " fmt, __func__ #include #include @@ -48,6 +48,7 @@ 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)))); @@ -64,6 +65,7 @@ static void __init pte_advanced_tests(struct mm_struct *mm, { 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); @@ -103,6 +105,7 @@ 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)))); } @@ -114,6 +117,7 @@ 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)))); @@ -138,6 +142,7 @@ static void __init pmd_advanced_tests(struct mm_struct *mm, 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; @@ -180,6 +185,7 @@ 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. */ @@ -193,6 +199,8 @@ static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) 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. @@ -208,6 +216,7 @@ 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)))); } @@ -220,6 +229,7 @@ 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)))); @@ -246,6 +256,7 @@ static void __init pud_advanced_tests(struct mm_struct *mm, 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; @@ -288,6 +299,7 @@ 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. */ @@ -301,6 +313,8 @@ static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) 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. @@ -354,6 +368,7 @@ 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)); } @@ -362,6 +377,7 @@ 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)); } @@ -374,6 +390,7 @@ 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); @@ -388,6 +405,8 @@ 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(). @@ -414,6 +433,7 @@ 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); @@ -429,6 +449,7 @@ 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(). @@ -447,6 +468,7 @@ 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); @@ -462,6 +484,7 @@ 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(). @@ -490,6 +513,7 @@ 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(); @@ -502,6 +526,7 @@ 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); @@ -514,6 +539,7 @@ 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(). @@ -531,6 +557,7 @@ static void __init pte_special_tests(unsigned long pfn, pgprot_t prot) if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL)) return; + pr_debug("Validating PTE special\n"); WARN_ON(!pte_special(pte_mkspecial(pte))); } @@ -541,6 +568,7 @@ static void __init pte_protnone_tests(unsigned long pfn, pgprot_t prot) if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) return; + pr_debug("Validating PTE protnone\n"); WARN_ON(!pte_protnone(pte)); WARN_ON(!pte_present(pte)); } @@ -553,6 +581,7 @@ static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) return; + pr_debug("Validating PMD protnone\n"); WARN_ON(!pmd_protnone(pmd)); WARN_ON(!pmd_present(pmd)); } @@ -565,6 +594,7 @@ 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))); } @@ -573,6 +603,7 @@ 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))); } @@ -581,6 +612,7 @@ 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 */ @@ -603,6 +635,7 @@ static void __init pte_soft_dirty_tests(unsigned long pfn, pgprot_t 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))); } @@ -614,6 +647,7 @@ static void __init pte_swap_soft_dirty_tests(unsigned long pfn, pgprot_t 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))); } @@ -626,6 +660,7 @@ static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t 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))); } @@ -638,6 +673,7 @@ static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) !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))); } @@ -653,6 +689,7 @@ 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); @@ -665,6 +702,7 @@ 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); @@ -681,6 +719,8 @@ static void __init swap_migration_tests(void) 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 @@ -720,6 +760,7 @@ 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. @@ -747,6 +788,7 @@ static void __init hugetlb_advanced_tests(struct mm_struct *mm, 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(); @@ -797,6 +839,7 @@ static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) 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 @@ -825,6 +868,7 @@ static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) 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))); From patchwork Mon Jul 13 03:23:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 1327689 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2001:8b0:10b:1231::1; helo=merlin.infradead.org; envelope-from=linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; secure) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=merlin.20170209 header.b=tpLHNj7l; dkim-atps=neutral Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4B4ptV2ttlz9sRk for ; Mon, 13 Jul 2020 13:25:06 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=QYIn1e1YfKcwZFPq6L9j+fXgXckNH616kypq4NiGohY=; b=tpLHNj7l1hufjXp5219XEZz4X1 tO4FqK6wiZW4j6HzT3PCFl9S1+cP8/T9wK56ii9BoAO00bIyXAvokJjBo343cQDtI9JDuKqgVmSZ2 q0jl5tFomn+ZavevT/47py82hCqZKq1Ws0O8az1iayfZtnqqDeoYLFMkaEYjUK83fvV7LowzfFgcc 6bgaw8an8PwknFTOvvvb53udtwiInwSPyvf+rFNjV+S92s2b4UeRgLS9PNUVg9cCxnZ3vOBn8sw+Y Wpxjx9mApjKZBSyMaw2PxwBT9tndB0DnlynTRuvBTKuQJzJKDzA6Iuh9nS+kv0BkHK7LCxQXnTw2/ RMXNWlYw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jup5R-0002PH-Fd; Mon, 13 Jul 2020 03:25:01 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jup57-0002Fo-Ey; Mon, 13 Jul 2020 03:24:48 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9D1071FB; Sun, 12 Jul 2020 20:24:40 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.87.124]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 526E93F7D8; Sun, 12 Jul 2020 20:24:28 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Subject: [PATCH V5 4/4] Documentation/mm: Add descriptions for arch page table helpers Date: Mon, 13 Jul 2020 08:53:07 +0530 Message-Id: <1594610587-4172-5-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1594610587-4172-1-git-send-email-anshuman.khandual@arm.com> References: <1594610587-4172-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200712_232441_769241_5717AE1E X-CRM114-Status: GOOD ( 17.89 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-doc@vger.kernel.org, Catalin Marinas , Heiko Carstens , Paul Mackerras , "H. Peter Anvin" , agordeev@linux.ibm.com, Will Deacon , linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Jonathan Corbet , Michael Ellerman , x86@kernel.org, christophe.leroy@csgroup.eu, Mike Rapoport , Christian Borntraeger , Ingo Molnar , linux-arm-kernel@lists.infradead.org, ziy@nvidia.com, Benjamin Herrenschmidt , linux-snps-arc@lists.infradead.org, Vasily Gorbik , Anshuman Khandual , cai@lca.pw, Paul Walmsley , "Kirill A . Shutemov" , Thomas Gleixner , gerald.schaefer@de.ibm.com, christophe.leroy@c-s.fr, Vineet Gupta , linux-kernel@vger.kernel.org, Palmer Dabbelt , aneesh.kumar@linux.ibm.com, Borislav Petkov , Andrew Morton , linuxppc-dev@lists.ozlabs.org, rppt@kernel.org MIME-Version: 1.0 Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org This adds a specific description file for all arch page table helpers which is in sync with the semantics being tested via CONFIG_DEBUG_VM_PGTABLE. All future changes either to these descriptions here or the debug test should always remain in sync. Cc: Jonathan Corbet Cc: Andrew Morton Cc: Gerald Schaefer Cc: Christophe Leroy Cc: Mike Rapoport Cc: Vineet Gupta Cc: Catalin Marinas Cc: Will Deacon Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Kirill A. Shutemov Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: linux-snps-arc@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-riscv@lists.infradead.org Cc: x86@kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Acked-by: Mike Rapoport Suggested-by: Mike Rapoport Signed-off-by: Anshuman Khandual --- Documentation/vm/arch_pgtable_helpers.rst | 258 ++++++++++++++++++++++ mm/debug_vm_pgtable.c | 6 + 2 files changed, 264 insertions(+) create mode 100644 Documentation/vm/arch_pgtable_helpers.rst diff --git a/Documentation/vm/arch_pgtable_helpers.rst b/Documentation/vm/arch_pgtable_helpers.rst new file mode 100644 index 000000000000..f3591ee3aaa8 --- /dev/null +++ b/Documentation/vm/arch_pgtable_helpers.rst @@ -0,0 +1,258 @@ +.. SPDX-License-Identifier: GPL-2.0 + +.. _arch_page_table_helpers: + +=============================== +Architecture Page Table Helpers +=============================== + +Generic MM expects architectures (with MMU) to provide helpers to create, access +and modify page table entries at various level for different memory functions. +These page table helpers need to conform to a common semantics across platforms. +Following tables describe the expected semantics which can also be tested during +boot via CONFIG_DEBUG_VM_PGTABLE option. All future changes in here or the debug +test need to be in sync. + +====================== +PTE Page Table Helpers +====================== + ++---------------------------+--------------------------------------------------+ +| pte_same | Tests whether both PTE entries are the same | ++---------------------------+--------------------------------------------------+ +| pte_bad | Tests a non-table mapped PTE | ++---------------------------+--------------------------------------------------+ +| pte_present | Tests a valid mapped PTE | ++---------------------------+--------------------------------------------------+ +| pte_young | Tests a young PTE | ++---------------------------+--------------------------------------------------+ +| pte_dirty | Tests a dirty PTE | ++---------------------------+--------------------------------------------------+ +| pte_write | Tests a writable PTE | ++---------------------------+--------------------------------------------------+ +| pte_special | Tests a special PTE | ++---------------------------+--------------------------------------------------+ +| pte_protnone | Tests a PROT_NONE PTE | ++---------------------------+--------------------------------------------------+ +| pte_devmap | Tests a ZONE_DEVICE mapped PTE | ++---------------------------+--------------------------------------------------+ +| pte_soft_dirty | Tests a soft dirty PTE | ++---------------------------+--------------------------------------------------+ +| pte_swp_soft_dirty | Tests a soft dirty swapped PTE | ++---------------------------+--------------------------------------------------+ +| pte_mkyoung | Creates a young PTE | ++---------------------------+--------------------------------------------------+ +| pte_mkold | Creates an old PTE | ++---------------------------+--------------------------------------------------+ +| pte_mkdirty | Creates a dirty PTE | ++---------------------------+--------------------------------------------------+ +| pte_mkclean | Creates a clean PTE | ++---------------------------+--------------------------------------------------+ +| pte_mkwrite | Creates a writable PTE | ++---------------------------+--------------------------------------------------+ +| pte_mkwrprotect | Creates a write protected PTE | ++---------------------------+--------------------------------------------------+ +| pte_mkspecial | Creates a special PTE | ++---------------------------+--------------------------------------------------+ +| pte_mkdevmap | Creates a ZONE_DEVICE mapped PTE | ++---------------------------+--------------------------------------------------+ +| pte_mksoft_dirty | Creates a soft dirty PTE | ++---------------------------+--------------------------------------------------+ +| pte_clear_soft_dirty | Clears a soft dirty PTE | ++---------------------------+--------------------------------------------------+ +| pte_swp_mksoft_dirty | Creates a soft dirty swapped PTE | ++---------------------------+--------------------------------------------------+ +| pte_swp_clear_soft_dirty | Clears a soft dirty swapped PTE | ++---------------------------+--------------------------------------------------+ +| pte_mknotpresent | Invalidates a mapped PTE | ++---------------------------+--------------------------------------------------+ +| ptep_get_and_clear | Clears a PTE | ++---------------------------+--------------------------------------------------+ +| ptep_get_and_clear_full | Clears a PTE | ++---------------------------+--------------------------------------------------+ +| ptep_test_and_clear_young | Clears young from a PTE | ++---------------------------+--------------------------------------------------+ +| ptep_set_wrprotect | Converts into a write protected PTE | ++---------------------------+--------------------------------------------------+ +| ptep_set_access_flags | Converts into a more permissive PTE | ++---------------------------+--------------------------------------------------+ + +====================== +PMD Page Table Helpers +====================== + ++---------------------------+--------------------------------------------------+ +| pmd_same | Tests whether both PMD entries are the same | ++---------------------------+--------------------------------------------------+ +| pmd_bad | Tests a non-table mapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_leaf | Tests a leaf mapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_huge | Tests a HugeTLB mapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_trans_huge | Tests a Transparent Huge Page (THP) at PMD | ++---------------------------+--------------------------------------------------+ +| pmd_present | Tests a valid mapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_young | Tests a young PMD | ++---------------------------+--------------------------------------------------+ +| pmd_dirty | Tests a dirty PMD | ++---------------------------+--------------------------------------------------+ +| pmd_write | Tests a writable PMD | ++---------------------------+--------------------------------------------------+ +| pmd_special | Tests a special PMD | ++---------------------------+--------------------------------------------------+ +| pmd_protnone | Tests a PROT_NONE PMD | ++---------------------------+--------------------------------------------------+ +| pmd_devmap | Tests a ZONE_DEVICE mapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_soft_dirty | Tests a soft dirty PMD | ++---------------------------+--------------------------------------------------+ +| pmd_swp_soft_dirty | Tests a soft dirty swapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkyoung | Creates a young PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkold | Creates an old PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkdirty | Creates a dirty PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkclean | Creates a clean PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkwrite | Creates a writable PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkwrprotect | Creates a write protected PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkspecial | Creates a special PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkdevmap | Creates a ZONE_DEVICE mapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mksoft_dirty | Creates a soft dirty PMD | ++---------------------------+--------------------------------------------------+ +| pmd_clear_soft_dirty | Clears a soft dirty PMD | ++---------------------------+--------------------------------------------------+ +| pmd_swp_mksoft_dirty | Creates a soft dirty swapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_swp_clear_soft_dirty | Clears a soft dirty swapped PMD | ++---------------------------+--------------------------------------------------+ +| pmd_mkinvalid | Invalidates a mapped PMD [1] | ++---------------------------+--------------------------------------------------+ +| pmd_set_huge | Creates a PMD huge mapping | ++---------------------------+--------------------------------------------------+ +| pmd_clear_huge | Clears a PMD huge mapping | ++---------------------------+--------------------------------------------------+ +| pmdp_get_and_clear | Clears a PMD | ++---------------------------+--------------------------------------------------+ +| pmdp_get_and_clear_full | Clears a PMD | ++---------------------------+--------------------------------------------------+ +| pmdp_test_and_clear_young | Clears young from a PMD | ++---------------------------+--------------------------------------------------+ +| pmdp_set_wrprotect | Converts into a write protected PMD | ++---------------------------+--------------------------------------------------+ +| pmdp_set_access_flags | Converts into a more permissive PMD | ++---------------------------+--------------------------------------------------+ + +====================== +PUD Page Table Helpers +====================== + ++---------------------------+--------------------------------------------------+ +| pud_same | Tests whether both PUD entries are the same | ++---------------------------+--------------------------------------------------+ +| pud_bad | Tests a non-table mapped PUD | ++---------------------------+--------------------------------------------------+ +| pud_leaf | Tests a leaf mapped PUD | ++---------------------------+--------------------------------------------------+ +| pud_huge | Tests a HugeTLB mapped PUD | ++---------------------------+--------------------------------------------------+ +| pud_trans_huge | Tests a Transparent Huge Page (THP) at PUD | ++---------------------------+--------------------------------------------------+ +| pud_present | Tests a valid mapped PUD | ++---------------------------+--------------------------------------------------+ +| pud_young | Tests a young PUD | ++---------------------------+--------------------------------------------------+ +| pud_dirty | Tests a dirty PUD | ++---------------------------+--------------------------------------------------+ +| pud_write | Tests a writable PUD | ++---------------------------+--------------------------------------------------+ +| pud_devmap | Tests a ZONE_DEVICE mapped PUD | ++---------------------------+--------------------------------------------------+ +| pud_mkyoung | Creates a young PUD | ++---------------------------+--------------------------------------------------+ +| pud_mkold | Creates an old PUD | ++---------------------------+--------------------------------------------------+ +| pud_mkdirty | Creates a dirty PUD | ++---------------------------+--------------------------------------------------+ +| pud_mkclean | Creates a clean PUD | ++---------------------------+--------------------------------------------------+ +| pud_mkwrite | Creates a writable PUD | ++---------------------------+--------------------------------------------------+ +| pud_mkwrprotect | Creates a write protected PUD | ++---------------------------+--------------------------------------------------+ +| pud_mkdevmap | Creates a ZONE_DEVICE mapped PUD | ++---------------------------+--------------------------------------------------+ +| pud_mkinvalid | Invalidates a mapped PUD [1] | ++---------------------------+--------------------------------------------------+ +| pud_set_huge | Creates a PUD huge mapping | ++---------------------------+--------------------------------------------------+ +| pud_clear_huge | Clears a PUD huge mapping | ++---------------------------+--------------------------------------------------+ +| pudp_get_and_clear | Clears a PUD | ++---------------------------+--------------------------------------------------+ +| pudp_get_and_clear_full | Clears a PUD | ++---------------------------+--------------------------------------------------+ +| pudp_test_and_clear_young | Clears young from a PUD | ++---------------------------+--------------------------------------------------+ +| pudp_set_wrprotect | Converts into a write protected PUD | ++---------------------------+--------------------------------------------------+ +| pudp_set_access_flags | Converts into a more permissive PUD | ++---------------------------+--------------------------------------------------+ + +========================== +HugeTLB Page Table Helpers +========================== + ++---------------------------+--------------------------------------------------+ +| pte_huge | Tests a HugeTLB | ++---------------------------+--------------------------------------------------+ +| pte_mkhuge | Creates a HugeTLB | ++---------------------------+--------------------------------------------------+ +| huge_pte_dirty | Tests a dirty HugeTLB | ++---------------------------+--------------------------------------------------+ +| huge_pte_write | Tests a writable HugeTLB | ++---------------------------+--------------------------------------------------+ +| huge_pte_mkdirty | Creates a dirty HugeTLB | ++---------------------------+--------------------------------------------------+ +| huge_pte_mkwrite | Creates a writable HugeTLB | ++---------------------------+--------------------------------------------------+ +| huge_pte_mkwrprotect | Creates a write protected HugeTLB | ++---------------------------+--------------------------------------------------+ +| huge_ptep_get_and_clear | Clears a HugeTLB | ++---------------------------+--------------------------------------------------+ +| huge_ptep_set_wrprotect | Converts into a write protected HugeTLB | ++---------------------------+--------------------------------------------------+ +| huge_ptep_set_access_flags | Converts into a more permissive HugeTLB | ++---------------------------+--------------------------------------------------+ + +======================== +SWAP Page Table Helpers +======================== + ++---------------------------+--------------------------------------------------+ +| __pte_to_swp_entry | Creates a swapped entry (arch) from a mapped PTE | ++---------------------------+--------------------------------------------------+ +| __swp_to_pte_entry | Creates a mapped PTE from a swapped entry (arch) | ++---------------------------+--------------------------------------------------+ +| __pmd_to_swp_entry | Creates a swapped entry (arch) from a mapped PMD | ++---------------------------+--------------------------------------------------+ +| __swp_to_pmd_entry | Creates a mapped PMD from a swapped entry (arch) | ++---------------------------+--------------------------------------------------+ +| is_migration_entry | Tests a migration (read or write) swapped entry | ++---------------------------+--------------------------------------------------+ +| is_write_migration_entry | Tests a write migration swapped entry | ++---------------------------+--------------------------------------------------+ +| make_migration_entry_read | Converts into read migration swapped entry | ++---------------------------+--------------------------------------------------+ +| make_migration_entry | Creates a migration swapped entry (read or write)| ++---------------------------+--------------------------------------------------+ + +[1] https://lore.kernel.org/linux-mm/20181017020930.GN30832@redhat.com/ diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index 0db4390435be..e86c3d824693 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -31,6 +31,12 @@ #include #include +/* + * 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) /*