From patchwork Wed May 31 21:30:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vishal Moola X-Patchwork-Id: 13262632 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9223AC8300C for ; Wed, 31 May 2023 21:32:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230318AbjEaVbc (ORCPT ); Wed, 31 May 2023 17:31:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230358AbjEaVb1 (ORCPT ); Wed, 31 May 2023 17:31:27 -0400 Received: from mail-yw1-x112f.google.com (mail-yw1-x112f.google.com [IPv6:2607:f8b0:4864:20::112f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B84F6194; Wed, 31 May 2023 14:31:20 -0700 (PDT) Received: by mail-yw1-x112f.google.com with SMTP id 00721157ae682-565ba6aee5fso820757b3.1; Wed, 31 May 2023 14:31:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1685568679; x=1688160679; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=ODlFnqFbwCYj1Eu7Q59WYAsHTUoZZ7gjL38Gt/grehE=; b=NGZceTIR2lqEzgrDeWjSiexk6w9g3s1TlD144+ZFhyEk2n6+p9UC+6qVvvVLXzp2su K9oJ0eJw0ezplOB9R0ifZq19iQ285sb1OM4mJ1UElkWFp36T3wq89+HQwlMRGwOKmFO7 z1tP0exNbwqfKUldCdliSyHLB7+WYxs5iLiptM0KEACbqVBdid/Ntr98KvLnXyv2Phff Kkrj2cY5I52akM7rhkuqjxOeMf+L5Rld4rmHhMpoy2yk5X8KAowKfrZQsw0r7hKhSbaY cfZsGjnDLb5nI+L/8w5H9J8F2OZUMVJi9RmJunsGnB8M2co0leG7lQkvBoLTt5HxAMxc OBEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685568679; x=1688160679; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ODlFnqFbwCYj1Eu7Q59WYAsHTUoZZ7gjL38Gt/grehE=; b=Hie11gJTrIZDZVqpS+R+KrfDYyMeO+YIFvHIlBSNp23XeHM3KCbnEoerPXJqyLCXJo LmNjsL33OkYtezeaT93DUIvFm1i7m3hoLkER0n880uyL2suYalQEfHejggpp1igFhEND b743A+YEgBjkJ0N7mS8IR6DKPXItLcAccDRfqSsZ60BP2PSDMNxqkyjPYnXisjZPq/Vq a1eZR7PFJPsF9hQJke0mTlk+1ZZVVvIK/RKpD8XGji59jng9EHXs9tG452kyhBoMgA5v FX5vd04jGKtvjxj5ynpCe0beHttTPMIucuE7emdPPQ0yRpqYEg0Ahs2lav8wQKiqOa/l nOAA== X-Gm-Message-State: AC+VfDzOMW2XGOVAyKNVO73NHByT0/E6Rz5DV7gtOswwheTeEvNFwEQe 1fwRKfqRd79j4RhoZH4Nab0= X-Google-Smtp-Source: ACHHUZ65n2/E4xpD/Goiwc5ceCegWo1qrr/SWnaz3wgfEMIe1tJLwwNDUTgx+izUNHv+/w4oBsm9SQ== X-Received: by 2002:a81:a0c1:0:b0:568:b10a:e430 with SMTP id x184-20020a81a0c1000000b00568b10ae430mr7264559ywg.25.1685568679304; Wed, 31 May 2023 14:31:19 -0700 (PDT) Received: from unknowna0e70b2ca394.attlocal.net ([2600:1700:2f7d:1800::46]) by smtp.googlemail.com with ESMTPSA id t63-20020a0dd142000000b0055aafcef659sm658905ywd.5.2023.05.31.14.31.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 May 2023 14:31:18 -0700 (PDT) From: "Vishal Moola (Oracle)" To: Andrew Morton , Matthew Wilcox Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, "Vishal Moola (Oracle)" Subject: [PATCH v3 05/34] mm: add utility functions for ptdesc Date: Wed, 31 May 2023 14:30:03 -0700 Message-Id: <20230531213032.25338-6-vishal.moola@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230531213032.25338-1-vishal.moola@gmail.com> References: <20230531213032.25338-1-vishal.moola@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Introduce utility functions setting the foundation for ptdescs. These will also assist in the splitting out of ptdesc from struct page. Functions that focus on the descriptor are prefixed with ptdesc_* while functions that focus on the pagetable are prefixed with pagetable_*. pagetable_alloc() is defined to allocate new ptdesc pages as compound pages. This is to standardize ptdescs by allowing for one allocation and one free function, in contrast to 2 allocation and 2 free functions. Signed-off-by: Vishal Moola (Oracle) --- include/asm-generic/tlb.h | 11 +++++++ include/linux/mm.h | 61 +++++++++++++++++++++++++++++++++++++++ include/linux/pgtable.h | 12 ++++++++ 3 files changed, 84 insertions(+) diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index b46617207c93..6bade9e0e799 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -481,6 +481,17 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) return tlb_remove_page_size(tlb, page, PAGE_SIZE); } +static inline void tlb_remove_ptdesc(struct mmu_gather *tlb, void *pt) +{ + tlb_remove_table(tlb, pt); +} + +/* Like tlb_remove_ptdesc, but for page-like page directories. */ +static inline void tlb_remove_page_ptdesc(struct mmu_gather *tlb, struct ptdesc *pt) +{ + tlb_remove_page(tlb, ptdesc_page(pt)); +} + static inline void tlb_change_page_size(struct mmu_gather *tlb, unsigned int page_size) { diff --git a/include/linux/mm.h b/include/linux/mm.h index 42ff3e04c006..620537e2f94f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2747,6 +2747,62 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a } #endif /* CONFIG_MMU */ +static inline struct ptdesc *virt_to_ptdesc(const void *x) +{ + return page_ptdesc(virt_to_page(x)); +} + +static inline void *ptdesc_to_virt(const struct ptdesc *pt) +{ + return page_to_virt(ptdesc_page(pt)); +} + +static inline void *ptdesc_address(const struct ptdesc *pt) +{ + return folio_address(ptdesc_folio(pt)); +} + +static inline bool pagetable_is_reserved(struct ptdesc *pt) +{ + return folio_test_reserved(ptdesc_folio(pt)); +} + +/** + * pagetable_alloc - Allocate pagetables + * @gfp: GFP flags + * @order: desired pagetable order + * + * pagetable_alloc allocates a page table descriptor as well as all pages + * described by it. + * + * Return: The ptdesc describing the allocated page tables. + */ +static inline struct ptdesc *pagetable_alloc(gfp_t gfp, unsigned int order) +{ + struct page *page = alloc_pages(gfp | __GFP_COMP, order); + + return page_ptdesc(page); +} + +/** + * pagetable_free - Free pagetables + * @pt: The page table descriptor + * + * pagetable_free frees a page table descriptor as well as all page + * tables described by said ptdesc. + */ +static inline void pagetable_free(struct ptdesc *pt) +{ + struct page *page = ptdesc_page(pt); + + __free_pages(page, compound_order(page)); +} + +static inline void pagetable_clear(void *x) +{ + clear_page(x); +} + #if USE_SPLIT_PTE_PTLOCKS #if ALLOC_SPLIT_PTLOCKS void __init ptlock_cache_init(void); @@ -2973,6 +3029,11 @@ static inline void mark_page_reserved(struct page *page) adjust_managed_page_count(page, -1); } +static inline void free_reserved_ptdesc(struct ptdesc *pt) +{ + free_reserved_page(ptdesc_page(pt)); +} + /* * Default method to free all the __init memory into the buddy system. * The freed pages will be poisoned with pattern "poison" if it's within diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index c997e9878969..5f12622d1521 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1027,6 +1027,18 @@ TABLE_MATCH(ptl, ptl); #undef TABLE_MATCH static_assert(sizeof(struct ptdesc) <= sizeof(struct page)); +#define ptdesc_page(pt) (_Generic((pt), \ + const struct ptdesc *: (const struct page *)(pt), \ + struct ptdesc *: (struct page *)(pt))) + +#define ptdesc_folio(pt) (_Generic((pt), \ + const struct ptdesc *: (const struct folio *)(pt), \ + struct ptdesc *: (struct folio *)(pt))) + +#define page_ptdesc(p) (_Generic((p), \ + const struct page *: (const struct ptdesc *)(p), \ + struct page *: (struct ptdesc *)(p))) + /* * No-op macros that just return the current protection value. Defined here * because these macros can be used even if CONFIG_MMU is not defined.