Messages in this thread | | | Subject | Re: dma-coherent property for PCIe Root | From | Jon Masters <> | Date | Thu, 1 Oct 2020 01:16:10 -0400 |
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On 9/14/20 1:23 AM, Valmiki wrote: > Hi All, > > How does "dma-coherent" property will work for PCIe as RC on an > ARM SOC ? > Because the end point device drivers are the one which will request dma > buffers and Root port driver doesn't involve in data path of end point > except for handling interrupts. > > How does EP DMA buffers will be hardware coherent if RC driver exposes > dma-coherent property ?
This simply means that the RC supports maintaining coherency, it doesn't mean that the RC driver does anything. It's a property of the hardware.
Jon.
-- Computer Architect
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