From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41E72C54FCB for ; Wed, 22 Apr 2020 14:25:46 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0DD6D2076E for ; Wed, 22 Apr 2020 14:25:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0DD6D2076E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B237A8E0029; Wed, 22 Apr 2020 10:25:45 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AAEF08E0003; Wed, 22 Apr 2020 10:25:45 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 94B5C8E0029; Wed, 22 Apr 2020 10:25:45 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0160.hostedemail.com [216.40.44.160]) by kanga.kvack.org (Postfix) with ESMTP id 7A8998E0003 for ; Wed, 22 Apr 2020 10:25:45 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 14A81181AEF00 for ; Wed, 22 Apr 2020 14:25:45 +0000 (UTC) X-FDA: 76735714650.08.cable02_4f2c8d3816117 X-HE-Tag: cable02_4f2c8d3816117 X-Filterd-Recvd-Size: 5102 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf18.hostedemail.com (Postfix) with ESMTP for ; Wed, 22 Apr 2020 14:25:43 +0000 (UTC) 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 013421042; Wed, 22 Apr 2020 07:25:43 -0700 (PDT) Received: from e112269-lin.arm.com (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8755C3F68F; Wed, 22 Apr 2020 07:25:41 -0700 (PDT) From: Steven Price To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Cc: Steven Price , linux-arch@vger.kernel.org, Andrew Morton , Arnd Bergmann , Catalin Marinas , Hugh Dickins , Vincenzo Frascino , Will Deacon Subject: [PATCH 1/4] mm: Add PG_ARCH_2 page flag Date: Wed, 22 Apr 2020 15:25:27 +0100 Message-Id: <20200422142530.32619-2-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200422142530.32619-1-steven.price@arm.com> References: <20200422142530.32619-1-steven.price@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: For arm64 MTE support it is necessary to be able to mark pages that contain user space visible tags that will need to be saved/restored e.g. when swapped out. To support this add a new arch specific flag (PG_ARCH_2) that arch code can opt into using ARCH_USES_PG_ARCH_2. Signed-off-by: Steven Price --- fs/proc/page.c | 3 +++ include/linux/kernel-page-flags.h | 1 + include/linux/page-flags.h | 3 +++ include/trace/events/mmflags.h | 9 ++++++++- mm/Kconfig | 3 +++ tools/vm/page-types.c | 2 ++ 6 files changed, 20 insertions(+), 1 deletion(-) diff --git a/fs/proc/page.c b/fs/proc/page.c index f909243d4a66..1b6cbe0849a8 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -217,6 +217,9 @@ u64 stable_page_flags(struct page *page) u |=3D kpf_copy_bit(k, KPF_PRIVATE_2, PG_private_2); u |=3D kpf_copy_bit(k, KPF_OWNER_PRIVATE, PG_owner_priv_1); u |=3D kpf_copy_bit(k, KPF_ARCH, PG_arch_1); +#ifdef CONFIG_ARCH_USES_PG_ARCH_2 + u |=3D kpf_copy_bit(k, KPF_ARCH_2, PG_arch_2); +#endif =20 return u; }; diff --git a/include/linux/kernel-page-flags.h b/include/linux/kernel-pag= e-flags.h index abd20ef93c98..eee1877a354e 100644 --- a/include/linux/kernel-page-flags.h +++ b/include/linux/kernel-page-flags.h @@ -17,5 +17,6 @@ #define KPF_ARCH 38 #define KPF_UNCACHED 39 #define KPF_SOFTDIRTY 40 +#define KPF_ARCH_2 41 =20 #endif /* LINUX_KERNEL_PAGE_FLAGS_H */ diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 222f6f7b2bb3..1d4971fe4fee 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -135,6 +135,9 @@ enum pageflags { #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT) PG_young, PG_idle, +#endif +#ifdef CONFIG_ARCH_USES_PG_ARCH_2 + PG_arch_2, #endif __NR_PAGEFLAGS, =20 diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflag= s.h index 5fb752034386..5d098029a2d8 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -79,6 +79,12 @@ #define IF_HAVE_PG_IDLE(flag,string) #endif =20 +#ifdef CONFIG_ARCH_USES_PG_ARCH_2 +#define IF_HAVE_PG_ARCH_2(flag,string) ,{1UL << flag, string} +#else +#define IF_HAVE_PG_ARCH_2(flag,string) +#endif + #define __def_pageflag_names \ {1UL << PG_locked, "locked" }, \ {1UL << PG_waiters, "waiters" }, \ @@ -105,7 +111,8 @@ IF_HAVE_PG_MLOCK(PG_mlocked, "mlocked" ) \ IF_HAVE_PG_UNCACHED(PG_uncached, "uncached" ) \ IF_HAVE_PG_HWPOISON(PG_hwpoison, "hwpoison" ) \ IF_HAVE_PG_IDLE(PG_young, "young" ) \ -IF_HAVE_PG_IDLE(PG_idle, "idle" ) +IF_HAVE_PG_IDLE(PG_idle, "idle" ) \ +IF_HAVE_PG_ARCH_2(PG_arch_2, "arch_2" ) =20 #define show_page_flags(flags) \ (flags) ? __print_flags(flags, "|", \ diff --git a/mm/Kconfig b/mm/Kconfig index c1acc34c1c35..60427ccc3cb8 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -867,4 +867,7 @@ config ARCH_HAS_HUGEPD config MAPPING_DIRTY_HELPERS bool =20 +config ARCH_USES_PG_ARCH_2 + bool + endmenu diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c index 58c0eab71bca..0517c744b04e 100644 --- a/tools/vm/page-types.c +++ b/tools/vm/page-types.c @@ -78,6 +78,7 @@ #define KPF_ARCH 38 #define KPF_UNCACHED 39 #define KPF_SOFTDIRTY 40 +#define KPF_ARCH_2 41 =20 /* [48-] take some arbitrary free slots for expanding overloaded flags * not part of kernel API @@ -135,6 +136,7 @@ static const char * const page_flag_names[] =3D { [KPF_ARCH] =3D "h:arch", [KPF_UNCACHED] =3D "c:uncached", [KPF_SOFTDIRTY] =3D "f:softdirty", + [KPF_ARCH_2] =3D "H:arch_2", =20 [KPF_READAHEAD] =3D "I:readahead", [KPF_SLOB_FREE] =3D "P:slob_free", --=20 2.20.1