From: Vinod Koul <vkoul@kernel.org>
To: Sumit Kumar <sumit.kumar@oss.qualcomm.com>
Cc: "Krishna Chaitanya Chundru" <krishna.chundru@oss.qualcomm.com>,
"Veerabhadrarao Badiganti"
<veerabhadrarao.badiganti@oss.qualcomm.com>,
"Subramanian Ananthanarayanan"
<subramanian.ananthanarayanan@oss.qualcomm.com>,
"Akhil Vinod" <akhil.vinod@oss.qualcomm.com>,
"Manivannan Sadhasivam" <mani@kernel.org>,
"Marek Szyprowski" <m.szyprowski@samsung.com>,
"Robin Murphy" <robin.murphy@arm.com>,
"Krzysztof Wilczyński" <kwilczynski@kernel.org>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
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
Subject: Re: [PATCH 1/3] dmaengine: Add multi-buffer support in single DMA transfer
Date: Tue, 17 Mar 2026 16:24:00 +0530 [thread overview]
Message-ID: <abkyyBxSnwZWAt4-@vaman> (raw)
In-Reply-To: <20260313-dma_multi_sg-v1-1-8fabb0d1a759@oss.qualcomm.com>
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
> 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?
--
~Vinod
next prev parent reply other threads:[~2026-03-17 10:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-13 6:49 [PATCH 0/3] dmaengine: Add batched scatter-gather DMA support Sumit Kumar
2026-03-13 6:49 ` [PATCH 1/3] dmaengine: Add multi-buffer support in single DMA transfer Sumit Kumar
2026-03-13 15:16 ` Robin Murphy
2026-03-16 17:05 ` Niklas Cassel
2026-03-17 10:54 ` Vinod Koul [this message]
2026-03-30 5:28 ` Sumit Kumar
2026-03-13 6:49 ` [PATCH 2/3] PCI: epf-mhi: Add batched DMA read support Sumit Kumar
2026-03-13 6:49 ` [PATCH 3/3] bus: mhi: ep: Use batched read for ring caching Sumit Kumar
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