From patchwork Mon Jul 6 00:48:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 11644785 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9C0D714E3 for ; Mon, 6 Jul 2020 00:51:27 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6756720747 for ; Mon, 6 Jul 2020 00:51:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="k95EcVlO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6756720747 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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=lnW1kXMG3WzcM9wQanXlQY04ade9OZF68QC8igyoI+0=; b=k95EcVlOVFKcWAFr4q503tpbEN +djTxP8eUeQ+CFt8nB0jxS2i7JGupMDxzQDzQxJ1C6hyxlD2QjGpKao2kgqyLNGZERg9sMQZqtPue mASBvzxOFTaAQ741JfT1sSDbWKGB5GHzwcRnoQUo45BXTU6pM5bk7+sMTlaF2En1IlE5YH5Ze8R1T 5x7hmWJ8Q0+JwNIEaIaCDSqPvP2ZjYcVxDy7gBT0boOdHyZW8XMOccC6IVrcYzKmwAshQooi3R297 qcyQkA4D4VKdv3yui1m9iZgf8G9tr9/fWEbMyd8gzHajzQfW4esfPAL7lKq2liTloNNlHVm+EK7mx iWvRuQdw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jsFKB-0006YG-6D; Mon, 06 Jul 2020 00:49:35 +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 1jsFK8-0006XY-Hv; Mon, 06 Jul 2020 00:49:33 +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 16864C0A; Sun, 5 Jul 2020 17:49:27 -0700 (PDT) Received: from p8cg001049571a15.arm.com (unknown [10.163.84.195]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CB0313F718; Sun, 5 Jul 2020 17:49:17 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org Subject: [PATCH V4 1/4] mm/debug_vm_pgtable: Add tests validating arch helpers for core MM features Date: Mon, 6 Jul 2020 06:18:33 +0530 Message-Id: <1593996516-7186-2-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1593996516-7186-1-git-send-email-anshuman.khandual@arm.com> References: <1593996516-7186-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200705_204932_690623_945B9044 X-CRM114-Status: GOOD ( 22.41 ) 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_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Benjamin Herrenschmidt , Heiko Carstens , Paul Mackerras , "H. Peter Anvin" , linux-riscv@lists.infradead.org, Will Deacon , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, Mike Rapoport , Christian Borntraeger , Ingo Molnar , Catalin Marinas , linux-snps-arc@lists.infradead.org, Vasily Gorbik , Anshuman Khandual , Borislav Petkov , Paul Walmsley , "Kirill A . Shutemov" , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Vineet Gupta , linux-kernel@vger.kernel.org, Palmer Dabbelt , Andrew Morton , linuxppc-dev@lists.ozlabs.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.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: 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);