Operations supported by I/OAT DMA

[harryji]

Hi, I am using the Xeon E5-2640 CPU with Ubuntu 18.04 (Linux kernel 5.4.0). I have enabled the I/OAT at BIOS and ioatdma module can be found. I tried to use the two functions: async_memcpy and async_xor_val from Asynchronous Transfers/Transforms API but the results indicate that they cannot find a DMA channel to carry the operations.  My question is whether Xeon CPU still supports this async_tx API. If not, which function is supported by I/OAT in Xeon and what is the API? Thanks.

[Leonardo_C_Intel]

Hello harryji,

Thank you for posting in the Intel Community. 

Due to the Intel® Xeon® Processor E5-2640 (https://ark.intel.com/content/www/us/en/ark/products/64591/intel-xeon-processor-e52640-15m-cache-2-50-ghz-7-20-gts-intel-qpi.html) product discontinuance status, Intel Customer Service no longer supports inquiries for it, but perhaps fellow community members have the knowledge to jump in and help

Hope this helps.

Regards,

Leonardo C.

Intel Customer Support Technician

[Leonardo_C_Intel]

Hello harryji,

Thank you for posting in the Intel Community. 

Due to the Intel® Xeon® Processor E5-2640 (https://ark.intel.com/content/www/us/en/ark/products/64591/intel-xeon-processor-e52640-15m-cache-2-50-ghz-7-20-gts-intel-qpi.html) product discontinuance status, Intel Customer Service no longer supports inquiries for it, but perhaps fellow community members have the knowledge to jump in and help

Hope this helps.

Regards,

Leonardo C.

Intel Customer Support Technician