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Sun, 29 Mar 2026 22:28:57 -0700 (PDT) X-Received: by 2002:a05:6a00:438a:b0:801:eee2:45b6 with SMTP id d2e1a72fcca58-82c95e7c457mr9909565b3a.24.1774848536921; Sun, 29 Mar 2026 22:28:56 -0700 (PDT) Received: from [10.217.219.124] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82ca8465785sm7263307b3a.18.2026.03.29.22.28.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 29 Mar 2026 22:28:56 -0700 (PDT) Message-ID: Date: Mon, 30 Mar 2026 10:58:50 +0530 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 1/3] dmaengine: Add multi-buffer support in single DMA transfer To: Vinod Koul Cc: Krishna Chaitanya Chundru , Veerabhadrarao Badiganti , Subramanian Ananthanarayanan , Akhil Vinod , Manivannan Sadhasivam , Marek Szyprowski , Robin Murphy , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-pci@vger.kernel.org, mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org References: <20260313-dma_multi_sg-v1-0-8fabb0d1a759@oss.qualcomm.com> <20260313-dma_multi_sg-v1-1-8fabb0d1a759@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: 7bit X-Authority-Analysis: v=2.4 cv=Jo78bc4C c=1 sm=1 tr=0 ts=69ca0a1a cx=c_pps a=rEQLjTOiSrHUhVqRoksmgQ==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=kGe3cHaNJUDbgVJfyvsA:9 a=QEXdDO2ut3YA:10 a=2VI0MkxyNR6bbpdq8BZq:22 X-Proofpoint-GUID: Z9IQWMDccvpkFazjyUW8_t3KdjoFx8hP X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzMwMDAzOSBTYWx0ZWRfX32PjU7tbJc6q scnCinuaW8vR/KPiR2q77d/g6QYf7CSKAI56RwPXYtbB9M47JUKC8H27M/SkAhna4iIMp8FRiR7 Xqch6h9tTDtXeByaJ1DJGJXeH7ZWC82IExGFw0e0q8GX58WKUrYCPsWkyeP+RQzRcq/639WJ79q 5FhODAvdZnI7A7nJyKD2jDy6hUTLK5ygoQr6Y+N78Ifb/stcHbsbLAuLnvPFp6uX3cwMnAizIY7 JIErzvJ68A8/hxshAeitWzg80M0kEiVvWCzmpCP9at30MgT6Xv1A0H0xURab//yDlJf/Vxkhvkx MzRUchHO0hHkVtoTwleOo5VIniFFPc22VMgRTQquKJWhPK1zrbVbE3fB2teetk6fvlyyGKdKuD+ IzvsrU0ImJqkCn7vfUfDKCENvcWEJQORdmOnd/HASEnwQVGQCN9SY8jZ/W4RmydHSe/VjrN0Fm5 4gUy4+2+xE+5aD+0g1Q== X-Proofpoint-ORIG-GUID: Z9IQWMDccvpkFazjyUW8_t3KdjoFx8hP X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-29_05,2026-03-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 phishscore=0 bulkscore=0 malwarescore=0 suspectscore=0 impostorscore=0 adultscore=0 priorityscore=1501 spamscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603300039 On 3/17/2026 4:24 PM, Vinod Koul wrote: > On 13-03-26, 12:19, Sumit Kumar wrote: >> Add dmaengine_prep_batch_sg API for batching multiple independent buffers >> in a single DMA transaction. Each scatter-gather entry specifies both >> source and destination addresses. This allows multiple non-contiguous > Looks like you want to bring back dmaengine_prep_dma_sg() see commit c678fa66341c I was not aware about this commit, I will bring back this change (only the core dma part). Along with my changes was are integrated with the above commit. >> memory regions to be transferred in a single DMA transaction instead of >> separate operations, significantly reducing submission overhead and >> interrupt overhead. >> >> Extends struct scatterlist with optional dma_dst_address field >> and implements support in dw-edma driver. > If this is memcpy why are you talking about dma_dst_address which is a > slave field? As we are going back with the commit c678fa66341c we can ignore the current patch. - Sumit