Messages in this thread | | | Date | Tue, 03 May 2011 14:31:46 +0800 | From | 康剑斌 <> | Subject | Re: Can I/OAT DMA engineer access PCI MMIO space |
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>> yes, I had used 'ioremap_nocache' to map the IO memory and I can use >> memcpy to copy data to this region. The async_tx should have been >> correctly configured as >> I can use aync_memcpy to copy data between different system memory address. > Then you should be using memcpy_toio() and friends > Do you mean that if I have mapped the mmio, I can' use I/OAT dma transfer to this region any more? I can use memcpy to copy data, but it consumes lots of cpu as PCI access is too slow. If I can use i/oat dma and asyc_tx api to do the job, the performance should be imporved. Thanks
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