Messages in this thread | ![/](/images/icornerl.gif) | | From | Vinod Koul <> | Subject | Re: [PATCH] dmaengine: dmatest: prevent using swiotlb buffer with nobounce parameter | Date | Mon, 11 Dec 2023 20:34:33 +0530 |
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On Fri, 24 Nov 2023 17:02:35 +0100, Amelie Delaunay wrote: > Source and destination data buffers are allocated with GPF_KERNEL flag. > It means that, if the DDR is more than 2GB, buffers can be allocated above > the 32-bit addressable space. In this case, and if the dma controller is > only 32-bit compatible, swiotlb bounce buffer, located in the 32-bit > addressable space, is used and introduces a memcpy. > > To prevent this extra memcpy, due to swiotlb bounce buffer use because > source or destination data buffer is allocated above the 32-bit addressable > space, force source and destination data buffers allocation with GPF_DMA > instead, when nobounce parameter is true. > > [...]
Applied, thanks!
[1/1] dmaengine: dmatest: prevent using swiotlb buffer with nobounce parameter commit: 70f008fb3ea9bd2e6727eebc858405acd49a212b
Best regards, -- ~Vinod
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