From patchwork Tue Mar 15 14:18:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 12781497 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79CBDC433FE for ; Tue, 15 Mar 2022 14:19:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 080278D0009; Tue, 15 Mar 2022 10:19:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 008268D0001; Tue, 15 Mar 2022 10:19:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D75FD8D0009; Tue, 15 Mar 2022 10:19:36 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.28]) by kanga.kvack.org (Postfix) with ESMTP id C21188D0001 for ; Tue, 15 Mar 2022 10:19:36 -0400 (EDT) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 8835F23D08 for ; Tue, 15 Mar 2022 14:19:36 +0000 (UTC) X-FDA: 79246828752.07.B5DDC06 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf15.hostedemail.com (Postfix) with ESMTP id 1B91CA0011 for ; Tue, 15 Mar 2022 14:19:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1647353975; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=g7ZGP9EEuZxPkkXsXc+GSR+h+oyuOSOhywhi58TOA4w=; b=BocfM9p1/K/nzkST19tVHyl+I2BvBtJ/o9rWKWb6hkIpX8J8q6EZE2I2VgSwvwRqGXIHCY dXimdOVrmKLejSwqXhxLPRkc1EGkvCu52XVdhJaFzMLS1ef1uxsXqRwX+cHAqS+85CtWhJ /ps/EBnE2GVhOLTyjq1DgsFxNQFcIjU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-376-B9RWVMP8NJKY4473arO79A-1; Tue, 15 Mar 2022 10:19:32 -0400 X-MC-Unique: B9RWVMP8NJKY4473arO79A-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0D19E1C05EA6; Tue, 15 Mar 2022 14:19:30 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.194.72]) by smtp.corp.redhat.com (Postfix) with ESMTP id CD5B64087D7E; Tue, 15 Mar 2022 14:19:21 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , Linus Torvalds , David Rientjes , Shakeel Butt , John Hubbard , Jason Gunthorpe , Mike Kravetz , Mike Rapoport , Yang Shi , "Kirill A . Shutemov" , Matthew Wilcox , Vlastimil Babka , Jann Horn , Michal Hocko , Nadav Amit , Rik van Riel , Roman Gushchin , Andrea Arcangeli , Peter Xu , Donald Dutile , Christoph Hellwig , Oleg Nesterov , Jan Kara , Liang Zhang , Pedro Gomes , Oded Gabbay , Catalin Marinas , Will Deacon , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , linux-mm@kvack.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, David Hildenbrand Subject: [PATCH v1 5/7] s390/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Tue, 15 Mar 2022 15:18:35 +0100 Message-Id: <20220315141837.137118-6-david@redhat.com> In-Reply-To: <20220315141837.137118-1-david@redhat.com> References: <20220315141837.137118-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 X-Rspamd-Queue-Id: 1B91CA0011 X-Rspam-User: Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=BocfM9p1; spf=none (imf15.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: ubqta6h1a1modix33y5zs9rprq78p8fa X-Rspamd-Server: rspam07 X-HE-Tag: 1647353975-106414 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: Let's steal one bit from the offset. While at it, document the meaning of bit 62 for swap ptes. Signed-off-by: David Hildenbrand Signed-off-by: David Hildenbrand --- arch/s390/include/asm/pgtable.h | 37 ++++++++++++++++++++++++++------- 1 file changed, 30 insertions(+), 7 deletions(-) diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 008a6c856fa4..c182212a2b44 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -181,6 +181,8 @@ static inline int is_module_addr(void *addr) #define _PAGE_SOFT_DIRTY 0x000 #endif +#define _PAGE_SWP_EXCLUSIVE _PAGE_LARGE /* SW pte exclusive swap bit */ + /* Set of bits not changed in pte_modify */ #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \ _PAGE_YOUNG | _PAGE_SOFT_DIRTY) @@ -796,6 +798,24 @@ static inline int pmd_protnone(pmd_t pmd) } #endif +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + static inline int pte_soft_dirty(pte_t pte) { return pte_val(pte) & _PAGE_SOFT_DIRTY; @@ -1675,16 +1695,19 @@ static inline int has_transparent_hugepage(void) * information in the lowcore. * Bits 54 and 63 are used to indicate the page type. * A swap pte is indicated by bit pattern (pte & 0x201) == 0x200 - * This leaves the bits 0-51 and bits 56-62 to store type and offset. - * We use the 5 bits from 57-61 for the type and the 52 bits from 0-51 + * This leaves the bits 0-50 and bits 56-61 to store type and offset. + * We use the 5 bits from 57-61 for the type and the 51 bits from 0-50 * for the offset. - * | offset |01100|type |00| - * |0000000000111111111122222222223333333333444444444455|55555|55566|66| - * |0123456789012345678901234567890123456789012345678901|23456|78901|23| + * | offset |E|01100|type |S0| + * |000000000011111111112222222222333333333344444444445|5|55555|55566|66| + * |012345678901234567890123456789012345678901234567890|1|23456|78901|23| + * + * S (bit 62) is used for softdirty tracking. + * E (bit 51) is used to remember PG_anon_exclusive. */ -#define __SWP_OFFSET_MASK ((1UL << 52) - 1) -#define __SWP_OFFSET_SHIFT 12 +#define __SWP_OFFSET_MASK ((1UL << 51) - 1) +#define __SWP_OFFSET_SHIFT 13 #define __SWP_TYPE_MASK ((1UL << 5) - 1) #define __SWP_TYPE_SHIFT 2