From patchwork Mon Apr 17 20:50:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vishal Moola X-Patchwork-Id: 13214598 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 45B43C7EE21 for ; Mon, 17 Apr 2023 20:53:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230492AbjDQUxW (ORCPT ); Mon, 17 Apr 2023 16:53:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39436 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229710AbjDQUw7 (ORCPT ); Mon, 17 Apr 2023 16:52:59 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6EAD649C3; Mon, 17 Apr 2023 13:52:51 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id i8so18357571plt.10; Mon, 17 Apr 2023 13:52:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1681764771; x=1684356771; 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=73w88W+Bv7iZwJaXp6X3OPD7H4X7IV5/5eDbDnIxbNE=; b=W9nPVyoXWKBUEnGfTyhkHARBTsZqdpJrkrNTKo667lyZEzjN6PxmFbbY0YylZMq9yl YfrdFmghyeO5HwXhYCrYBTje7eKqSW91jSFSDlT0dbMWvyCEN9ttpAXe7AFMT1oxAH0K BCnetbVzBpycS1Tax/m+o/Gfxhef/Kkj1D6sF8rcDiRlOa7VvGL8i+xK5Gl2/zoIf4yK M/9RMi7Hd+G3wH7cuJrpgQnusczVewZS29/AobewpqmBg09r8g/9YIIka/gTIbj6DHBc MFg7CjS5kCFyT6XG4/q3MJQ78bnC2QIXJhA82Tu9j9zbgdzbLpx3IE+L7G092ISLAdCE r0mA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681764771; x=1684356771; 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=73w88W+Bv7iZwJaXp6X3OPD7H4X7IV5/5eDbDnIxbNE=; b=Te6MV/AiBHKaEJ6l1TQKjBKaJJw8+yQG51jiY2PNRKJIuYncjv1wBbGpmY2oM361hT Ta21/3Vy0AfbY+ph97CuLc3sbD58wbXVrv7XKSJsqHmyddGayNrevUL5iAUZuujwQkiV Bjf4wBHHmuQBAQsd1nRqBEtMyEUUXPk1x5THKL2WnJO2WWcy8OE7E0ohEm6kjwjNRoMr d5+xTYrs9rYgO1guzfoxdZ+iVoMrW3J597TghPSE7/EVBBETaGGn9ywvjvtVF5Qposfe SKym/UqNMf7wJQu41dvQmOY5wFB6IoZMuxVbidMsxsZFpCiNrQQ4g/Ob3D5U6MzvLDbF kh8w== X-Gm-Message-State: AAQBX9ehBYayugYIBdddB/WsXl47cxdu1ZpNZHHkNjp6LLc9FXebhouq +eNW/whHJrExr8AOByQNwYA= X-Google-Smtp-Source: AKy350ZgO/j6WOIysdkqHxj8eua8dcgo+KDK2FD0csNlrjJfCGtmgVmsUk4Xos3l7Ag2y16revzrHg== X-Received: by 2002:a17:902:8bc6:b0:1a2:8924:224a with SMTP id r6-20020a1709028bc600b001a28924224amr205356plo.25.1681764770838; Mon, 17 Apr 2023 13:52:50 -0700 (PDT) Received: from fedora.hsd1.ca.comcast.net ([2601:644:937f:7f20::c139]) by smtp.googlemail.com with ESMTPSA id h7-20020a17090ac38700b0022335f1dae2sm7609707pjt.22.2023.04.17.13.52.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Apr 2023 13:52:50 -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 04/33] mm: add utility functions for ptdesc Date: Mon, 17 Apr 2023 13:50:19 -0700 Message-Id: <20230417205048.15870-5-vishal.moola@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230417205048.15870-1-vishal.moola@gmail.com> References: <20230417205048.15870-1-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. ptdesc_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 | 44 +++++++++++++++++++++++++++++++++++++++ include/linux/pgtable.h | 13 ++++++++++++ 3 files changed, 68 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 b18848ae7e22..ec3cbe2fa665 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2744,6 +2744,45 @@ 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_head_page(x)); +} + +static inline void *ptdesc_to_virt(struct ptdesc *pt) +{ + return page_to_virt(ptdesc_page(pt)); +} + +static inline void *ptdesc_address(struct ptdesc *pt) +{ + return folio_address(ptdesc_folio(pt)); +} + +static inline bool ptdesc_is_reserved(struct ptdesc *pt) +{ + return folio_test_reserved(ptdesc_folio(pt)); +} + +static inline struct ptdesc *ptdesc_alloc(gfp_t gfp, unsigned int order) +{ + struct page *page = alloc_pages(gfp | __GFP_COMP, order); + + return page_ptdesc(page); +} + +static inline void ptdesc_free(struct ptdesc *pt) +{ + struct page *page = ptdesc_page(pt); + + __free_pages(page, compound_order(page)); +} + +static inline void ptdesc_clear(void *x) +{ + clear_page(x); +} + #if USE_SPLIT_PTE_PTLOCKS #if ALLOC_SPLIT_PTLOCKS void __init ptlock_cache_init(void); @@ -2970,6 +3009,11 @@ 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 7cc6ea057ee9..7cd803aa38eb 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -97,6 +97,19 @@ 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))) + +static inline struct ptdesc *page_ptdesc(struct page *page) +{ + return (struct ptdesc *)page; +} + /* * A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD] *