From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f171.google.com (mail-ob0-f171.google.com [209.85.214.171]) by kanga.kvack.org (Postfix) with ESMTP id 3A4286B0071 for ; Tue, 24 Feb 2015 19:15:45 -0500 (EST) Received: by mail-ob0-f171.google.com with SMTP id gq1so553367obb.2 for ; Tue, 24 Feb 2015 16:15:44 -0800 (PST) Received: from g4t3425.houston.hp.com (g4t3425.houston.hp.com. [15.201.208.53]) by mx.google.com with ESMTPS id ms3si9453975obb.68.2015.02.24.16.15.44 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 24 Feb 2015 16:15:44 -0800 (PST) From: Toshi Kani Subject: [PATCH v8 4/7] x86, mm, pat: Add pgprot_writethrough() for WT Date: Tue, 24 Feb 2015 17:14:58 -0700 Message-Id: <1424823301-30927-5-git-send-email-toshi.kani@hp.com> In-Reply-To: <1424823301-30927-1-git-send-email-toshi.kani@hp.com> References: <1424823301-30927-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org, arnd@arndb.de Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net, hmh@hmh.eng.br, yigal@plexistor.com, konrad.wilk@oracle.com, Elliott@hp.com, Toshi Kani This patch adds pgprot_writethrough() for setting WT to a given pgprot_t. Signed-off-by: Toshi Kani Reviewed-by: Konrad Rzeszutek Wilk --- arch/x86/include/asm/pgtable_types.h | 3 +++ arch/x86/mm/pat.c | 10 ++++++++++ include/asm-generic/pgtable.h | 4 ++++ 3 files changed, 17 insertions(+) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 8c7c108..e962f06 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -367,6 +367,9 @@ extern int nx_enabled; #define pgprot_writecombine pgprot_writecombine extern pgprot_t pgprot_writecombine(pgprot_t prot); +#define pgprot_writethrough pgprot_writethrough +extern pgprot_t pgprot_writethrough(pgprot_t prot); + /* Indicate that x86 has its own track and untrack pfn vma functions */ #define __HAVE_PFNMAP_TRACKING diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index b4db0d8..d3f7058 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -972,6 +972,16 @@ pgprot_t pgprot_writecombine(pgprot_t prot) } EXPORT_SYMBOL_GPL(pgprot_writecombine); +pgprot_t pgprot_writethrough(pgprot_t prot) +{ + if (pat_enabled) + return __pgprot(pgprot_val(prot) | + cachemode2protval(_PAGE_CACHE_MODE_WT)); + else + return pgprot_noncached(prot); +} +EXPORT_SYMBOL_GPL(pgprot_writethrough); + #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_X86_PAT) static struct memtype *memtype_get_idx(loff_t pos) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 4d46085..d1e59a4 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -256,6 +256,10 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b) #define pgprot_writecombine pgprot_noncached #endif +#ifndef pgprot_writethrough +#define pgprot_writethrough pgprot_noncached +#endif + #ifndef pgprot_device #define pgprot_device pgprot_noncached #endif -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org