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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id F182DC83F0A for ; Tue, 8 Jul 2025 12:06:57 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4B7ED6B0316; Tue, 8 Jul 2025 08:06:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4695B6B0317; Tue, 8 Jul 2025 08:06:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 357926B0318; Tue, 8 Jul 2025 08:06:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 2081B6B0316 for ; Tue, 8 Jul 2025 08:06:57 -0400 (EDT) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id D123980566 for ; Tue, 8 Jul 2025 12:06:56 +0000 (UTC) X-FDA: 83640971232.03.C4D0493 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf21.hostedemail.com (Postfix) with ESMTP id 267611C0004 for ; Tue, 8 Jul 2025 12:06:54 +0000 (UTC) Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=s4Ol3iwJ; spf=pass (imf21.hostedemail.com: domain of leon@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=leon@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1751976415; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rViczFoCFQtwcNKraNBrnlXHpBXf2oyXrvi9VNukGlc=; b=wSIeWeysW33RVSBYlyydUghcpiNKYiKP3D76qL+TLNrEevsM+wlipAtoVnukqzZUw0wuSW h9ZU1XIucPHTt72JOUmAf5uefi4FcYXhT98kXoj98d8fZypbE/1Zm8CO5yM7/qmpST3CuT 05R8ByFbNcW0O3OJtaD3QkoHczR/jJw= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=s4Ol3iwJ; spf=pass (imf21.hostedemail.com: domain of leon@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=leon@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1751976415; a=rsa-sha256; cv=none; b=lIYheD6waSiPVsNlI0KMawBnUy6Tspw11M4Q2mygV3QBTPuEfdamC0qKQ00n5xiE8cYM7/ 7nxbNcvEz7ode03tccjkQBRhciXMwlrpOe2wRHyVJ91qB/XOvuSgDkT8AmvrFKv9k4DKtS GIm+SvVc1sm9m/LEDt0R9OB9MiTNXNg= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id F40AF61482; Tue, 8 Jul 2025 12:06:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0BD93C4CEED; Tue, 8 Jul 2025 12:06:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751976413; bh=Kp+7+tPAvccy71FanvJSzbOLd0z4kN89DqWYezw1OYU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=s4Ol3iwJuZ3bPifC90ngIr53J9DwqfI6SbJ5ng6mhsvmmhKJUSP01KISqF+xudx5r OwNqQVnrJ4kgc1lmi+fQdvA0puZRnmrNIscNKhk5x+qQ848zPKeKACjmQZlA8St0fV Wh5vNh7wUnm4qxPx7+pAli1/51YHFmtJSZMusuSZuTl+gmd4JhiDkCdnWCI/H5I1ks daIfLQQN7QeyVcgmSHDG4twzeXB/Ep5gXJRK1YtdaaDN50mReflr3MzMrYthKL7TRa VEK8qO2fuRa1AUaPB9bVOUF38SjH0Q+6EnxeFRNWiQ3OyIyapOpfsk4PRDL5JY2WCt ethkWrczJo/aQ== Date: Tue, 8 Jul 2025 15:06:47 +0300 From: Leon Romanovsky To: Marek Szyprowski Cc: Christoph Hellwig , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Robin Murphy , Joerg Roedel , Will Deacon , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , Alexander Potapenko , Marco Elver , Dmitry Vyukov , Masami Hiramatsu , Mathieu Desnoyers , =?iso-8859-1?B?Suly9G1l?= Glisse , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux.dev, virtualization@lists.linux.dev, kasan-dev@googlegroups.com, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, Jason Gunthorpe Subject: Re: [PATCH 0/8] dma-mapping: migrate to physical address-based API Message-ID: <20250708120647.GG592765@unreal> References: <35df6f2a-0010-41fe-b490-f52693fe4778@samsung.com> <20250627170213.GL17401@unreal> <20250630133839.GA26981@lst.de> <69b177dc-c149-40d3-bbde-3f6bad0efd0e@samsung.com> <20250708110007.GF592765@unreal> <261f2417-78a9-45b8-bcec-7e36421a243c@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <261f2417-78a9-45b8-bcec-7e36421a243c@samsung.com> X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 267611C0004 X-Rspam-User: X-Stat-Signature: ctjbuixz19be9sm7yuzfbceyow3hhgc1 X-HE-Tag: 1751976414-277488 X-HE-Meta: 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 aJf6612k JKyD/44qwxZUYF/glx1wHjrR6GMe8tSdEo3ZLuCRhoDEv9TXI68fyWszuDO7KB9cYyqGROrOmZMB+eit9+iho086ZhMZ/vusiUucnGfOJGNO/lIzYMVQCOFxNpzqtfEInsA9oGJgV035G+Rl9vJniMfusdY0+xNyOY5tTGquvG6ko2PrM08H2DoRyDeaTcAOWYNd3flD8+7TymTT5NlMXzQW28JqJEnvgzwvN88kWfH5fHgut+bEyoCyfucU5OG/p9hfdj3sIAR4yRE8sMwUjVsj1hxQB35OszF1RIsOjn/iM8Nc= 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: List-Subscribe: List-Unsubscribe: On Tue, Jul 08, 2025 at 01:45:20PM +0200, Marek Szyprowski wrote: > On 08.07.2025 13:00, Leon Romanovsky wrote: > > On Tue, Jul 08, 2025 at 12:27:09PM +0200, Marek Szyprowski wrote: > >> On 30.06.2025 15:38, Christoph Hellwig wrote: > >>> On Fri, Jun 27, 2025 at 08:02:13PM +0300, Leon Romanovsky wrote: > >>>>> Thanks for this rework! I assume that the next step is to add map_phys > >>>>> callback also to the dma_map_ops and teach various dma-mapping providers > >>>>> to use it to avoid more phys-to-page-to-phys conversions. > >>>> Probably Christoph will say yes, however I personally don't see any > >>>> benefit in this. Maybe I wrong here, but all existing .map_page() > >>>> implementation platforms don't support p2p anyway. They won't benefit > >>>> from this such conversion. > >>> I think that conversion should eventually happen, and rather sooner than > >>> later. > >> Agreed. > >> > >> Applied patches 1-7 to my dma-mapping-next branch. Let me know if one > >> needs a stable branch with it. > > Thanks a lot, I don't think that stable branch is needed. Realistically > > speaking, my VFIO DMA work won't be merged this cycle, We are in -rc5, > > it is complete rewrite from RFC version and touches pci-p2p code (to > > remove dependency on struct page) in addition to VFIO, so it will take > > time. > > > > Regarding, last patch (hmm), it will be great if you can take it. > > We didn't touch anything in hmm.c this cycle and have no plans to send PR. > > It can safely go through your tree. > > Okay, then I would like to get an explicit ack from Jérôme for this. Jerome is not active in HMM world for a long time already. HMM tree is managed by us (RDMA) https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/log/?h=hmm ➜ kernel git:(m/dmabuf-vfio) git log --merges mm/hmm.c ... Pull HMM updates from Jason Gunthorpe: ... https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=58ba80c4740212c29a1cf9b48f588e60a7612209 +hmm git git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git#hmm We just never bothered to reflect current situation in MAINTAINERS file. Thanks