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Altera_Forum's avatar
Altera_Forum
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14 years ago

Simple data transfer over PCIe for co-processing

I will briefly explain what I am trying do. I have a host PC running linux and connected to an Arria GX II over PCIe. I am trying to send some data over to the FPGA, do some processing on that ( say ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

For (1) I've used a simple driver that gets the virtual address from pci_iomap() then in response to read/write requests (normally pread/pwrite) from the application does a copy_to/from_user() directly from the io space.

Remember to check the limit of the user copy!

However this will be somewhat slow - you will almost certainly need to use DMA (initiated at either end) in order to get reasonable sized PCIe requests.

Possibly very careful use of the data cache will suffice.