From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailout2.w1.samsung.com (mailout2.w1.samsung.com [210.118.77.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB4FC39FCC4 for ; Fri, 20 Mar 2026 11:09:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.118.77.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774004999; cv=none; b=W1NgmShSI7PsvNv2muuOLjcoPENpYuIZKoind2YsaWrR+/UHtwJ3+mb+vZohTH2aAkMv6EzmqO4y4mdnEPhJdTVzAMCK0bg5fx4ryTZ4aOHkjk9qSTdVJXti1jqw2a+4/KFI1A+3pJdlLVGnC0S31vY0y5/KS0grHP20jd/bv7Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774004999; c=relaxed/simple; bh=muj+S0CwdCa4Mdabtxh88dHeY5bgveIdxMpzHzByQ6E=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:From:In-Reply-To: Content-Type:References; b=VbHE9mavHApjUbs8mRla5PuO7qPdvc/wWiFxE0kGWMvDoKLcgrARwnUeAqtWy1MoPSH2EvkeqZ/WX6MVA3CCvzr7qJ/2+N0IjtGmUbk98VLEnDSmwJA0+VdGLGALzj2xZjOnRD6ECU57895VMZr+Gm7ChvPlCl5FWxG2vUyqUUE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com; spf=pass smtp.mailfrom=samsung.com; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b=ptyVoPWX; arc=none smtp.client-ip=210.118.77.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samsung.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="ptyVoPWX" Received: from eucas1p2.samsung.com (unknown [182.198.249.207]) by mailout2.w1.samsung.com (KnoxPortal) with ESMTP id 20260320110956euoutp02d16195b6f3b2f0b874358a0dd76a1e95~eiCUe_FJt1780617806euoutp02E for ; Fri, 20 Mar 2026 11:09:56 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.w1.samsung.com 20260320110956euoutp02d16195b6f3b2f0b874358a0dd76a1e95~eiCUe_FJt1780617806euoutp02E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1774004996; bh=pTmqpdf8GjnyZsUw8L2XfkacmPpa02J4Xau6gTuFHFk=; h=Date:Subject:To:Cc:From:In-Reply-To:References:From; b=ptyVoPWXcBIi6CFajqz8jBHUc7QxmVLROBIa6B07X05T2gMHSAF3qJV+Mxu2faMdW uAMswRdsBVr/P6CT4N9vFmq0zmpofYL/qZzw6yGNXtUr+3CNEGQBePtGtm+H/geV65 29SmHCE/UzvDdepCwlLyhLC/iO2gx/kPUCouI5Ys= Received: from eusmtip1.samsung.com (unknown [203.254.199.221]) by eucas1p2.samsung.com (KnoxPortal) with ESMTPA id 20260320110955eucas1p27a53a87afc17b63b07866d088aeac78a~eiCUCPSBF0485504855eucas1p2p; Fri, 20 Mar 2026 11:09:55 +0000 (GMT) Received: from [106.210.134.192] (unknown [106.210.134.192]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20260320110953eusmtip1e57b08b4312207c095ed6eee93225c85~eiCR0ORyQ2928429284eusmtip1k; Fri, 20 Mar 2026 11:09:53 +0000 (GMT) Message-ID: Date: Fri, 20 Mar 2026 12:09:52 +0100 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Betterbird (Windows) Subject: Re: [PATCH v3 0/8] RDMA: Enable operation with DMA debug enabled To: Leon Romanovsky , Robin Murphy , "Michael S. Tsirkin" , Petr Tesarik , Jonathan Corbet , Shuah Khan , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Jason Gunthorpe , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Joerg Roedel , Will Deacon , Andrew Morton Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, virtualization@lists.linux.dev, linux-rdma@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org Content-Language: en-US From: Marek Szyprowski In-Reply-To: <20260316-dma-debug-overlap-v3-0-1dde90a7f08b@nvidia.com> Content-Transfer-Encoding: 8bit X-CMS-MailID: 20260320110955eucas1p27a53a87afc17b63b07866d088aeac78a X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20260316190712eucas1p27573f4514f2cf7dca5d58414b3c2b7e8 X-EPHeader: CA X-CMS-RootMailID: 20260316190712eucas1p27573f4514f2cf7dca5d58414b3c2b7e8 References: <20260316-dma-debug-overlap-v3-0-1dde90a7f08b@nvidia.com> On 16.03.2026 20:06, Leon Romanovsky wrote: > Add a new DMA_ATTR_REQUIRE_COHERENT attribute to the DMA API to mark > mappings that must run on a DMA‑coherent system. Such buffers cannot > use the SWIOTLB path, may overlap with CPU caches, and do not depend on > explicit cache flushing. > > Mappings using this attribute are rejected on systems where cache > side‑effects could lead to data corruption, and therefore do not need > the cache‑overlap debugging logic. This series also includes fixes for > DMA_ATTR_CPU_CACHE_CLEAN handling. > Thanks. > > Signed-off-by: Leon Romanovsky Applied to dma-mapping-fixes. Thanks! > --- > Changes in v3: > - Enriched commit messages and documentation > - Added ROB tags > - Link to v2: https://protect2.fireeye.com/v1/url?k=9c1ba148-fd90b40f-9c1a2a07-000babff99aa-86ebd022a97425b3&q=1&e=3c8e10cc-4c34-4bf6-aa9d-c339877d6a27&u=https%3A%2F%2Fpatch.msgid.link%2F20260311-dma-debug-overlap-v2-0-e00bc2ca346d%40nvidia.com > > Changes in v2: > - Added DMA_ATTR_REQUIRE_COHERENT attribute > - Added HMM patch which needs this attribute as well > - Renamed DMA_ATTR_CPU_CACHE_CLEAN to be DMA_ATTR_DEBUGGING_IGNORE_CACHELINES > - Link to v1: https://protect2.fireeye.com/v1/url?k=cc0590de-ad8e8599-cc041b91-000babff99aa-07e4da206b7e0d97&q=1&e=3c8e10cc-4c34-4bf6-aa9d-c339877d6a27&u=https%3A%2F%2Fpatch.msgid.link%2F20260307-dma-debug-overlap-v1-0-c034c38872af%40nvidia.com > > --- > Leon Romanovsky (8): > dma-debug: Allow multiple invocations of overlapping entries > dma-mapping: handle DMA_ATTR_CPU_CACHE_CLEAN in trace output > dma-mapping: Clarify valid conditions for CPU cache line overlap > dma-mapping: Introduce DMA require coherency attribute > dma-direct: prevent SWIOTLB path when DMA_ATTR_REQUIRE_COHERENT is set > iommu/dma: add support for DMA_ATTR_REQUIRE_COHERENT attribute > RDMA/umem: Tell DMA mapping that UMEM requires coherency > mm/hmm: Indicate that HMM requires DMA coherency > > Documentation/core-api/dma-attributes.rst | 38 ++++++++++++++++++++++++------- > drivers/infiniband/core/umem.c | 5 ++-- > drivers/iommu/dma-iommu.c | 21 +++++++++++++---- > drivers/virtio/virtio_ring.c | 10 ++++---- > include/linux/dma-mapping.h | 15 ++++++++---- > include/trace/events/dma.h | 4 +++- > kernel/dma/debug.c | 9 ++++---- > kernel/dma/direct.h | 7 +++--- > kernel/dma/mapping.c | 6 +++++ > mm/hmm.c | 4 ++-- > 10 files changed, 86 insertions(+), 33 deletions(-) > --- > base-commit: 11439c4635edd669ae435eec308f4ab8a0804808 > change-id: 20260305-dma-debug-overlap-21487c3fa02c > > Best regards, > -- > Leon Romanovsky > > Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland