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=-4.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 7C7B3C433F5 for ; Sat, 18 Sep 2021 08:39:22 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4B68260F5B for ; Sat, 18 Sep 2021 08:39:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 4B68260F5B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=bDlurRpNlNa7FCMR6lq/aKM1vo+wrhQPopC77eCMU+s=; b=b80EmFhTphCLJS frMte5sroOVemZllZ6DzPu/IxxbQmBdB555jtwJ6CarXOxWU67mKV7KRFwwLlc3hc3TiPgveA9glP jtKhh/hkB3OdNqs4Tsi5ME+wk/5GkRAmyZ/wmz+kHdAZprLBSdhlt3r3VXEOiz9UnKs+GIiqJhONN XEvozREUzmkzzR+Lw7wus8yUqn0drlAw80ZAwHrSPI81Jz0hQh0z2ZO/jjh4TgZrWcavmkgaURADt E7AX611a5QL7twqCeNbPlsf49N/diGge4iPmfWdsziQOP1WoNbqz/Wr7eEQ0u4eyWCFJESA3VxfWi kfCMUC/DfDsOZKCQSgkw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mRVqf-00FcLy-LU; Sat, 18 Sep 2021 08:37:25 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mRVqc-00FcLV-DP for linux-arm-kernel@lists.infradead.org; Sat, 18 Sep 2021 08:37:23 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1CFF061244; Sat, 18 Sep 2021 08:37:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631954242; bh=5rf6GNCOG0zu4pGRCwF+YbXBBU6EolzS6vCH7c+IvKs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Yxwy2HNMi9dHgQj9qCv86MXaNJJQWiUl6Ksd+njViNwepR7JvlYUW8CuXfggEoyh1 1kjY23zZPcRybB1El/UDq0QsV7kCY4jWKNWZjepFw+IZ88p2Jsk6rsbJ7zuYHhNCwG 3Tjn+d5c2zpVrD7ebKQ/1M8Bog6vuuATN1lzFh9U/yIjtxbtAPKtASHMjiO3YQ7bNC Ozj+nv19D8498bWxx85KY23BA62zLoM6nwgUujOiQCP/852Y5mTI3M1QCogtYlPkWP DUJOdp0voj9dTCR4xtk1S/KJ8rLJgQvCx//iI4e2CNUJlrLcWU9prfnhsNnzTLFGLw HpsMCtbBGCEag== Date: Sat, 18 Sep 2021 11:37:15 +0300 From: Mike Rapoport To: Christoph Hellwig Cc: Catalin Marinas , David Hildenbrand , Robin Murphy , Alex Bee , Will Deacon , Andrew Morton , Anshuman Khandual , Linux Kernel Mailing List , linux-mm@kvack.org, Linux ARM Subject: Re: [BUG 5.14] arm64/mm: dma memory mapping fails (in some cases) Message-ID: References: <20210824173741.GC623@arm.com> <0908ce39-7e30-91fa-68ef-11620f9596ae@arm.com> <60a11eba-2910-3b5f-ef96-97d4556c1596@redhat.com> <20210825102044.GA3420@arm.com> <20210918051843.GA16104@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210918051843.GA16104@lst.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210918_013722_514666_D4CBAA6D X-CRM114-Status: GOOD ( 13.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, Sep 18, 2021 at 07:18:43AM +0200, Christoph Hellwig wrote: > On Sat, Sep 18, 2021 at 12:22:47AM +0300, Mike Rapoport wrote: > > I did some digging and it seems that the most "generic" way to check if a > > page is in RAM is page_is_ram(). It's not 100% bullet proof as it'll give > > false negatives for architectures that do not register "System RAM", but > > those are not using dma_map_resource() anyway and, apparently, never would. > > The downside of page_is_ram is that it looks really expensiv for > something done at dma mapping time. Indeed :( But pfn_valid is plain wrong... I'll keep digging. -- Sincerely yours, Mike. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel