From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 C526543932B for ; Thu, 30 Jul 2026 13:43:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785418987; cv=none; b=bPEosc2QEsJ0l4RGW4R47FnswPJfoPwMUjaBWgiHGW46aXPD+ENm5klvmV/VJ77U6kUeTQ1NvqvpWGgw/H10ZsB1szmFUmXWpjkonq87S8YdEpBkLQxZu44KwxJkqqbX79KK4mteuzVpR2kePuQede3S67tkxX0rVzdKhUL4Arw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785418987; c=relaxed/simple; bh=yzhUy4o0mOiRrgJ+9DOMPc8IwPfnEtJ/dCNB3RDvKao=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=IYVgC6okv2SUgZbEXQ1iU+M+h173zf1u5ed6uRpJ+bALtI8tnKqbROATb1bi0oEN8geF2l/fXN8oRo/a4CF30DYwbqJgAxjKBe/m6qB6KIAR45S3u1pmRA3BatXIJpBPHyCEhfjQWIaSCwhWpyt7Mk/eFMBVjQYY8cukz/9NvwE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=WuBkjEPE; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=QZxekst1; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="WuBkjEPE"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="QZxekst1" Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 66UDc1A5973093 for ; Thu, 30 Jul 2026 13:43:04 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= LIHC0dGoCfL4jo/TTDqxxd8bs6eGi4j6fVBGNZoeJSw=; b=WuBkjEPEQ6+jaMAP mb7/eJ2DfGQPN8Y84dNiQ6j+CFSIFrqWAsxwUjY42fZuux0vSgKE4CwYUBxJX4y8 YW4Lhs5BtJG87JVyfjtLs88SO1AZ9VVRACBDSd1dLjCwmFixdKS+k5Jq8L/SkslP dy7pA3v31WKP9bof+R+XetAssoV7ZE4Lakkcg1MI8X0lJ3jGB5a8srg9e6F3+byW ZbuW12hYQtj5jkMBvX09jKqK0u8ngTBgksd9BOf1ZQrpL6/nfooMFvXsBvRTHLkC ktGGj8VTarBbnRPHMG+yr8jQnddWlMP8CDG+t94qhxht+gDofuOu8d9l73N7yi/E UvDZVw== Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4fr7nv00mb-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 30 Jul 2026 13:43:04 +0000 (GMT) Received: by mail-qt1-f199.google.com with SMTP id d75a77b69052e-51bfe75b7dbso3038581cf.3 for ; Thu, 30 Jul 2026 06:43:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1785418984; x=1786023784; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:from:to:cc:subject:date:message-id:reply-to :content-type; bh=LIHC0dGoCfL4jo/TTDqxxd8bs6eGi4j6fVBGNZoeJSw=; b=QZxekst19v2l4C7SkalKfKr4feAwJ4gNrfrThPCP5FN4H4l+l5qwSAoyBoYBioeMU3 tvQHy8RGKgsbp76C4SR8Pi86ziIXtwDZsou5peuR9pHlj/MLTOhbIi67zU/GVIkKfcSt +W9fhA8fpRnvMGnlVwJOkyCux2IPEB629+0+3CB6vxk7OGxPOGh/T01Osdwh4XUUYK03 /dg2mvu5KgpnU72S8W13KVtjLkfHsE9GUUMbULS9jmulG9mnxmXYDh8A2FiIoc0nfC+6 LjN0P/v0eNbfkXbHvoYFHOa9C0JTNLuV/Ds0FGylbz8jsZsVKTBsH7x5U0LjUgr8NC6y hjyw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785418984; x=1786023784; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=LIHC0dGoCfL4jo/TTDqxxd8bs6eGi4j6fVBGNZoeJSw=; b=dI2VudcShuMZoeIDMWtdO0IsEFy4Z2dQlgvSbGokTjJ2YX4NATS3a9FuvWYdBSLpoC JngiGPdhxt1joEjaXx4DL2vvLUBMdoYklfmi1zERdV4FfUWZcQJIYRPV3WNxU1uH5FVF rcOmVpi2GUVfYCb2OWEKhrUj0FKQf5BCfMGVUbA7/75app19FaNUwzXasVV5032m9u7r AvTdUkB91Plr/vmpXHr8yNAtCZOfjhgcKTqZfPCD29lCflZ1frha6JhCcBUfxKjLyCse JrgQlzyD83bpvO8QJzInadEZK+gpP1YuDmkgdyTiKtTO94E4noDqkjuwHDEwKDkXMr8S ucMg== X-Forwarded-Encrypted: i=1; AHgh+RpR2rNa120b1JADLR5UHHebwzBNz4xAZ3GFar6Y7imZXE4gC/s+EqCwVlUUNr4anFJlC/0nvHMAt5Ip/uc=@vger.kernel.org X-Gm-Message-State: AOJu0Ywm6CuyG82H7xbun9wszqMQUVst84eZPhw7qyMsEy1VcvR2KRxX 624Sw0O7cAJLIZ6elO2BDCB1H6F172VtpFlZs8pU43pbr+c+EHtxfuBjXx0rci+07/CyOx1+ftY 4tm5DfsFO9KsW+oW88lAQ3A6vXfQJJm0tIXOzaSCFTN1I5efIJZlTNGyRavlRQ5aYg0o= X-Gm-Gg: AR+sD1069OcpVc1M9xcwiJR0OY7TXRvPsfQ0cFQoFTh/P+6q27XZ0hybojkYcOmqz5u QtuOjOQLBwMFk3bQ1bK+dvsLQ4N1v4hCQcNBczVvolQSJQPhheFlTI+Q4i6IY1PaWHdctZXr9Rf Z7zq8aJ5AbHyBSaV7iBCyMABCsP6ekCI90vqWT2gI5wcboMU8hOHNaWOI0GRdpRzHWjTb59pNTI mX4Rn2f6R216hGwXLA9Uw41LdA0Zlkns9vLuWUjc4GzggcZ7JZy5IAweFQgsubSQCsFprPYtF8b aObNn2kEZHnfvDSn11472h6ECNZPyKn0ifCVgkxq4b0EsT2ty+vHqfNW8OxFx0yqohWdqskfohS lV2HMRZLYLXxcuqbxeC83mUn7 X-Received: by 2002:a05:622a:a98b:20b0:51b:f9e0:87b0 with SMTP id d75a77b69052e-52b42b7f23dmr3221531cf.2.1785418983751; Thu, 30 Jul 2026 06:43:03 -0700 (PDT) X-Received: by 2002:a05:622a:a98b:20b0:51b:f9e0:87b0 with SMTP id d75a77b69052e-52b42b7f23dmr3221211cf.2.1785418983387; Thu, 30 Jul 2026 06:43:03 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1fa8b6dbdesm66080166b.36.2026.07.30.06.42.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Jul 2026 06:43:02 -0700 (PDT) Message-ID: <8e55ef12-6c4a-42b4-923b-238b3739ea51@oss.qualcomm.com> Date: Thu, 30 Jul 2026 15:42:58 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] drm/msm: detach the ARM DMA mapping before attaching our own domain To: Dmitry Baryshkov , Rob Clark , "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , Sricharan Ramabadhran , Joerg Roedel , Russell King , Lu Baolu , Jerry Snitselaar , Jason Gunthorpe , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Heiko Stuebner Cc: linux-arm-msm@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-rockchip@lists.infradead.org References: <20260730-fix-qcom-smmu-v1-0-b12fa067804e@oss.qualcomm.com> <20260730-fix-qcom-smmu-v1-3-b12fa067804e@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260730-fix-qcom-smmu-v1-3-b12fa067804e@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzMwMDEwMyBTYWx0ZWRfX9dCZvvqb8ip6 wJnfKPwKDNe3YAMElTti2BwB7oeDSmYgf10rk5UY5ieyANUazjNy3NjqX11pazHKbHenTPCpUZm 1lRhtplUEewZJrcXir4rgd5mthsYE9Lhkh+mIiPWVHOuOBOM+/NrIMy72BidSN2HbgiSV9DGHkS u2Qo7QbRG/B1H48MPjYzny5k9Q/K+8WyekBh9ZOXroyL/9Fc98zcdYwCWhwWR6HUwhFMwnPZQJK eSyGh415ejnGHr06U0zys2EyToU8htsEIsAsg0CLKS6ooZkZnZ/gI9QipXUpvTBny8mg0kX7Lh7 UhPKDqOadMqnrBI3W3bclXoHLBzm4MQGIPvXdzVm6z41qy5sObnILKbnEaiWUanbleb9e5Rt7Iv CoBkaiqOyku4/ED7WQ7Pxn95eZoOoqJyxtRQLteKrMafNftsu9U+3NbMjtfm3qexBEv35cFhfKN A9OzM/OgS9A4RQZrdlw== X-Proofpoint-ORIG-GUID: 8eiXanVWSv-RVulspghBMFpffEPPOWST X-Proofpoint-Spam-Info: AW1haW4tMjYwNzMwMDEwMyBTYWx0ZWRfXwc9cFKcwOmVx fPsYduqKXYXG7sK68qgu7FcrYH+iQHCa/y1N16QkEhC4vOkqzO7lpvMnqDeHJXMzlXxps305f7T ANU502UUcDTm1ywvyZngT1CWIdBPJA8= X-Authority-Analysis: v=2.4 cv=Fpc1OWrq c=1 sm=1 tr=0 ts=6a6b54e8 cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=mSMHI8jCXtBZcuwA1AYA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 X-Proofpoint-GUID: 8eiXanVWSv-RVulspghBMFpffEPPOWST X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-30_04,2026-07-29_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 bulkscore=0 adultscore=0 spamscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607300103 On 7/30/26 3:29 PM, Dmitry Baryshkov wrote: > On ARM32 with CONFIG_ARM_DMA_USE_IOMMU, arch_setup_dma_ops() creates a > dma_iommu_mapping for every IOMMU-backed device and attaches its domain > to the device's IOMMU group. That domain is neither the group's default > nor its blocking domain, so when msm_iommu_new() later attaches the > domain the driver manages itself, __iommu_attach_group() refuses it: [...] > +#if defined(CONFIG_ARM_DMA_USE_IOMMU) > +#include > +#else > +#define arm_iommu_detach_device(...) ({ }) > +#define arm_iommu_release_mapping(...) ({ }) > +#define to_dma_iommu_mapping(dev) NULL > +#endif I see this is prior art, but should we support this config being off? Konrad