From patchwork Wed Oct 9 15:35:07 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steve Capper X-Patchwork-Id: 20915 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-qa0-f70.google.com (mail-qa0-f70.google.com [209.85.216.70]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id 9056225C6D for ; Wed, 9 Oct 2013 15:35:32 +0000 (UTC) Received: by mail-qa0-f70.google.com with SMTP id i13sf2149677qae.9 for ; Wed, 09 Oct 2013 08:35:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=mime-version:x-gm-message-state:delivered-to:from:to:cc:subject :date:message-id:in-reply-to:references:x-original-sender :x-original-authentication-results:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-unsubscribe; bh=cEKW9sSMIJhf5zr5+y1cbD/5LppogR0w/a0po76esZs=; b=Y4PDCdC+O174eJiCmvi37aRu05Flm7EpxqQ3lzbEsAJga9KF6iaWOLd7zCbail8jEJ IFMeP2YT0tr2n7I+0Uv+Yj8sQuye5zW+/snBR73p48+vUO81Z0IbuNHo4I6HBLzBoCBG SyEJztFtY9KkjHRGkQ3hGcN6LWuBV5aekv1pJ7cOCWkV0Y4jJb93X/xA3YG0pX5M9BYF RxhVuXoIxDHtfTsk3mixuIdB48hr9Aq2sVh7NbplI2EeDB02wyuzhIFOdPnSFCQertol mhfRr6Jr+aVfiPqHUnAuiIl1wHCf0CQtjMKAJQfVIs9Q5GQfhu0IpCkULMfjm0D8wzH3 94jg== X-Received: by 10.236.36.39 with SMTP id v27mr7483242yha.5.1381332932411; Wed, 09 Oct 2013 08:35:32 -0700 (PDT) MIME-Version: 1.0 X-BeenThere: patchwork-forward@linaro.org Received: by 10.49.2.166 with SMTP id 6ls628690qev.69.gmail; Wed, 09 Oct 2013 08:35:32 -0700 (PDT) X-Received: by 10.52.170.111 with SMTP id al15mr611879vdc.43.1381332932310; Wed, 09 Oct 2013 08:35:32 -0700 (PDT) Received: from mail-vc0-f180.google.com (mail-vc0-f180.google.com [209.85.220.180]) by mx.google.com with ESMTPS id zw10si12018847vdb.109.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 09 Oct 2013 08:35:32 -0700 (PDT) Received-SPF: neutral (google.com: 209.85.220.180 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) client-ip=209.85.220.180; Received: by mail-vc0-f180.google.com with SMTP id ld13so616705vcb.25 for ; Wed, 09 Oct 2013 08:35:32 -0700 (PDT) X-Gm-Message-State: ALoCoQnUvvPs9pxxrjiwBGqVSKdNno2bRiK8XSBrgJQ6eP7+mgvj/2+PBZgOrpl6C5ciqHjQg44o X-Received: by 10.220.76.201 with SMTP id d9mr294020vck.49.1381332932208; Wed, 09 Oct 2013 08:35:32 -0700 (PDT) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patches@linaro.org Received: by 10.220.174.196 with SMTP id u4csp298222vcz; Wed, 9 Oct 2013 08:35:31 -0700 (PDT) X-Received: by 10.194.200.100 with SMTP id jr4mr7194174wjc.37.1381332931052; Wed, 09 Oct 2013 08:35:31 -0700 (PDT) Received: from mail-wi0-f179.google.com (mail-wi0-f179.google.com [209.85.212.179]) by mx.google.com with ESMTPS id fp6si3862864wib.60.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 09 Oct 2013 08:35:30 -0700 (PDT) Received-SPF: neutral (google.com: 209.85.212.179 is neither permitted nor denied by best guess record for domain of steve.capper@linaro.org) client-ip=209.85.212.179; Received: by mail-wi0-f179.google.com with SMTP id hm2so1161056wib.0 for ; Wed, 09 Oct 2013 08:35:30 -0700 (PDT) X-Received: by 10.180.206.42 with SMTP id ll10mr3329293wic.50.1381332930112; Wed, 09 Oct 2013 08:35:30 -0700 (PDT) Received: from marmot.wormnet.eu (marmot.wormnet.eu. [188.246.204.87]) by mx.google.com with ESMTPSA id j5sm16444594wia.4.1969.12.31.16.00.00 (version=TLSv1.2 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 09 Oct 2013 08:35:29 -0700 (PDT) From: Steve Capper To: linux-arm-kernel@lists.infradead.org Cc: linux@arm.linux.org.uk, linaro-kernel@lists.linaro.org, patches@linaro.org, rob.herring@calxeda.com, hoffman@marvell.com, broonie@kernel.org, dsaxena@linaro.org, catalin.marinas@arm.com, Steve Capper Subject: [RFC PATCH 2/2] ARM: mm: Transparent huge page support for non-LPAE systems. Date: Wed, 9 Oct 2013 16:35:07 +0100 Message-Id: <1381332907-10179-3-git-send-email-steve.capper@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1381332907-10179-1-git-send-email-steve.capper@linaro.org> References: <1381332907-10179-1-git-send-email-steve.capper@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: steve.capper@linaro.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.220.180 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Much of the required code for THP has been implemented in the earlier non-LPAE HugeTLB patch. One more domain bit is used (to store whether or not the THP is splitting). Some THP helper functions are defined; and we have to re-define pmd_page such that it distinguishes between page tables and sections. Signed-off-by: Steve Capper --- arch/arm/Kconfig | 2 +- arch/arm/include/asm/pgtable-2level.h | 47 +++++++++++++++++++++++++++++++++++ arch/arm/include/asm/pgtable-3level.h | 1 + arch/arm/include/asm/pgtable.h | 2 -- 4 files changed, 49 insertions(+), 3 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fe6eeae..6b53969 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1755,7 +1755,7 @@ config SYS_SUPPORTS_HUGETLBFS config HAVE_ARCH_TRANSPARENT_HUGEPAGE def_bool y - depends on ARM_LPAE + depends on SYS_SUPPORTS_HUGETLBFS config ARCH_WANT_GENERAL_HUGETLB def_bool y diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h index 29ace75..a48eddc 100644 --- a/arch/arm/include/asm/pgtable-2level.h +++ b/arch/arm/include/asm/pgtable-2level.h @@ -217,6 +217,7 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) #define PMD_DSECT_PROT_NONE (_AT(pmdval_t, 1) << 5) #define PMD_DSECT_DIRTY (_AT(pmdval_t, 1) << 6) #define PMD_DSECT_AF (_AT(pmdval_t, 1) << 7) +#define PMD_DSECT_SPLITTING (_AT(pmdval_t, 1) << 8) #define PMD_BIT_FUNC(fn,op) \ static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; } @@ -304,6 +305,52 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmdret; \ }) +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_DSECT_SPLITTING) +#define pmd_trans_huge(pmd) (pmd_large(pmd)) +#else +static inline int pmd_trans_huge(pmd_t pmd); +#endif + +PMD_BIT_FUNC(mksplitting, |= PMD_DSECT_SPLITTING); +#define pmd_mkhuge(pmd) (__pmd((pmd_val(pmd) & ~PMD_TYPE_MASK) | PMD_TYPE_SECT)) + +static inline unsigned long pmd_pfn(pmd_t pmd) +{ + /* + * for a section, we need to mask off more of the pmd + * before looking up the pfn. + * + * pmd_pfn only gets sections from the thp code. + */ + if (pmd_trans_huge(pmd)) + return __phys_to_pfn(pmd_val(pmd) & HPAGE_MASK); + else + return __phys_to_pfn(pmd_val(pmd) & PHYS_MASK); +} + +#define pfn_pmd(pfn,prot) pmd_modify(__pmd(__pfn_to_phys(pfn)),prot); +#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot); + +static inline int has_transparent_hugepage(void) +{ + return 1; +} + +static inline struct page *pmd_page(pmd_t pmd) +{ + /* + * for a section, we need to mask off more of the pmd + * before looking up the page as it is a section descriptor. + * + * pmd_page only gets sections from the thp code. + */ + if (pmd_trans_huge(pmd)) + return (phys_to_page(pmd_val(pmd) & HPAGE_MASK)); + + return phys_to_page(pmd_val(pmd) & PHYS_MASK); +} + #endif /* __ASSEMBLY__ */ #endif /* _ASM_PGTABLE_2LEVEL_H */ diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h index 67a0e06..9c38f29 100644 --- a/arch/arm/include/asm/pgtable-3level.h +++ b/arch/arm/include/asm/pgtable-3level.h @@ -234,6 +234,7 @@ PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF); /* represent a notpresent pmd by zero, this is used by pmdp_invalidate */ #define pmd_mknotpresent(pmd) (__pmd(0)) +#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) { diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index cf77a59..66a1417 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -189,8 +189,6 @@ static inline pte_t *pmd_page_vaddr(pmd_t pmd) return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); } -#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) - #ifndef CONFIG_HIGHPTE #define __pte_map(pmd) pmd_page_vaddr(*(pmd)) #define __pte_unmap(pte) do { } while (0)