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Mon, 07 Sep 2026 23:19:22 -0700 (PDT) X-Received: by 2002:a17:90a:e703:b0:398:e969:87ef with SMTP id 98e67ed59e1d1-39b2629926dmr42480891a91.24.1788848362367; Mon, 07 Sep 2026 23:19:22 -0700 (PDT) Received: from [10.217.216.255] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1433171a97esm32885817c88.12.2026.09.07.23.19.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 07 Sep 2026 23:19:21 -0700 (PDT) Message-ID: <43009f4c-55c8-4f82-9efe-b72747f68cc5@oss.qualcomm.com> Date: Tue, 8 Sep 2026 11:49:17 +0530 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] pci: designware: Set DMA_BYPASS bit in outbound IATU CTRL2 register To: Manivannan Sadhasivam , Krishna Chaitanya Chundru Cc: Jingoo Han , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260826-dma_bypass-v1-1-3a53dc748ce2@oss.qualcomm.com> <1fe0ff27-abc6-4813-a4a8-8bf8ca92b91a@oss.qualcomm.com> Content-Language: en-US From: Sumit Kumar In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA4MDA2NyBTYWx0ZWRfX8qWCaRwltWDe /XBNw055YvAkZ/X7XDvTIye3Cd4VplASF/VISUpdSKjThxify6yegdTipLOL0Wvgdhm7HaYHMiY yA3DIfSqWh1eIV1rJKeMcduFObhZRIs= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA4MDA2NyBTYWx0ZWRfX2bu/6tCJDTG/ 5hdBohA9oHD30MqUJ4gD3fTxhOp+rcsThnKPA4KD98lMyEq8DorZmJFVCWXv78VAEB78FSPoSMK ndAQZc2U+ygCiYhsN//8IxLqR4poIJ0TiVjZ//2kplEILo7i0IZc4a5WHPDaa39aDd9aP14caVW NajgpPlTjkvIZChTfztqpHD6Cp+AWq5EFIBGxPv/QL4HFmxNWGPWFofw7Mtpntah3s0fftXN9fR HJB36DyNDj5lwV795IyGuf3CmSH1p5KX3JTP+V5FqHwZPSzpmpcLawTpcRjGRHu5wGCCTaSRY7l qYdTq6GK06ioh1UWxrSDRP5Vl3LKNLgktLYNE4q28w3dvpBUa8cIS70sHKvnXqVjd9+cUx9w/9y xvBkJFFL/Cda5Pl+xWmQP9IhuRry2+s7ewObrYTnmGVQ2GX9EQ7a/0QzaehsOPar62n2UgX5ljx reJ2UeIy2bma2GNZ+hw== X-Proofpoint-ORIG-GUID: onagjsxRfJvIz3Qpr6sl5_A1lJvbqr3w X-Authority-Analysis: v=2.4 cv=QrduG1yd c=1 sm=1 tr=0 ts=6a9fa8eb cx=c_pps a=UNFcQwm+pnOIJct1K4W+Mw==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=YUdBlht9uQjFYAMZ6iUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=uKXjsCUrEbL0IQVhDsJ9:22 X-Proofpoint-GUID: onagjsxRfJvIz3Qpr6sl5_A1lJvbqr3w X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-07_07,2026-09-07_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 adultscore=0 malwarescore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 priorityscore=1501 phishscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609080067 On 9/2/2026 9:47 PM, Manivannan Sadhasivam wrote: > On Wed, Sep 02, 2026 at 08:44:57PM +0530, Krishna Chaitanya Chundru wrote: >> >> On 9/2/2026 7:37 PM, Manivannan Sadhasivam wrote: >>> On Wed, Aug 26, 2026 at 02:41:20PM +0530, Sumit Kumar wrote: >>>> Outbound IATU apertures are configured with local device-side addresses. >>>> When DMA engine transactions use destination addresses which fall within >>>> an outbound IATU aperture range, they get unintentionally translated by >>>> the IATU, causing the wrong address to be sent on the PCIe link. >>>> This results in data corruption or IOMMU errors at the host if the >>>> translated address is not mapped. >>>> >>> Why are you using the same device address in both DMA and iATU mapping? This >>> sounds like a mapping problem that you should fix instead. >> issue happens, when host address(DMA destination address) matches with the >> internal iova address programmed in iATU src address. >> As we can cannot address in both,  we need to program iATU in DMA bypass mode, >> so DMA transcations will not go through iATU window. >> > This needs to be explained clearly in the commit message with an example > matching the DWC terminologies such as 'Target Address Registers'. > > - Mani > updated in v2. - Sumit